scuffed-code/icu4c/source/common/ucnv2022.c

/*  
**********************************************************************
*   Copyright (C) 2000, International Business Machines
*   Corporation and others.  All Rights Reserved.
**********************************************************************
*   file name:  ucnv2022.c
*   encoding:   US-ASCII
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2000feb03
*   created by: Markus W. Scherer
*
*   Change history:
*
*   06/29/2000  helena      Major rewrite of the callback APIs.
*   08/08/2000  Ram         Included support for ISO-2022-JP-2
*                           Changed implementation of toUnicode
*                           function
*   08/21/2000  Ram         Added support for ISO-2022-KR
*   08/29/2000  Ram         Seperated implementation of EBCDIC to 
*                           ucnvebdc.c
*   09/20/2000  Ram         Added support for ISO-2022-CN
*                           Added implementations for getNextUChar()
*                           for specific 2022 country variants.
*/

#include "unicode/utypes.h"
#include "cmemory.h"
#include "ucmp16.h"
#include "ucmp8.h"
#include "unicode/ucnv_err.h"
#include "ucnv_bld.h"
#include "unicode/ucnv.h"
#include "ucnv_cnv.h"
#include "unicode/ustring.h"
#include "cstring.h"

#define TEST_ERROR_CONDITION(args,myTargetIndex, mySourceIndex, isTargetUCharDBCS, myConverterData, err){ \
    if(*err ==U_BUFFER_OVERFLOW_ERROR){ \
            /*save the state and return */ \
            args->target += myTargetIndex; \
            args->source += mySourceIndex; \
            myConverterData->sourceIndex = 0; \
            myConverterData->targetIndex = 0; \
            args->converter->fromUnicodeStatus = isTargetUCharDBCS; \
            return; \
        } \
}

#define TEST_ERROR_CONDITION_CN(args,myTargetIndex, mySourceIndex, myConverterData, err){ \
    if(*err ==U_BUFFER_OVERFLOW_ERROR){ \
            /*save the state and return */ \
            args->target += myTargetIndex; \
            args->source += mySourceIndex; \
            myConverterData->sourceIndex = 0; \
            myConverterData->targetIndex = 0; \
            return; \
        } \
}
#define UCNV_SS2 "\x1B\x4E"
#define UCNV_SS3 "\x1B\x4F"

#define ESC 0x0B

/* Added by ram for ISO-2022JP implementation*/
typedef enum  {
    ASCII = 0,
    ISO8859_1 ,
    ISO8859_7 ,
    JISX201 ,
    JISX208 ,
    JISX212 ,
    GB2312  ,
    KSC5601

} StateEnum;


typedef enum {
    SBCS = 0,
    DBCS,
    MBCS,
    LATIN1
}Cnv2022Type;


typedef struct{
    UConverter *currentConverter;
    UConverter *previousConverter;
    UConverter *fromUnicodeConverter;
    UBool isFirstBuffer;
    StateEnum currentState;
    int plane;
    uint8_t escSeq2022[10];
    int8_t escSeq2022Length;
    UConverter* myConverterArray[8];
    int32_t targetIndex;
    int32_t sourceIndex;
    UBool isEscapeAppended;
    UBool isShiftAppended;
    char *currentLocale;
    UBool shiftValid2Bytes;
}UConverterDataISO2022;

/* ISO-2022 ----------------------------------------------------------------- */

/*Forward declaration */
U_CFUNC void T_UConverter_fromUnicode_UTF8 (UConverterFromUnicodeArgs * args,
                    UErrorCode * err);

U_CFUNC void T_UConverter_fromUnicode_UTF8_OFFSETS_LOGIC (UConverterFromUnicodeArgs * args,
                    UErrorCode * err);


/* Protos */
/***************** ISO-2022 ********************************/
U_CFUNC void T_UConverter_toUnicode_ISO_2022(UConverterToUnicodeArgs * args,
                    UErrorCode * err);

U_CFUNC void T_UConverter_toUnicode_ISO_2022_OFFSETS_LOGIC (UConverterToUnicodeArgs * args,
                    UErrorCode * err);

U_CFUNC void T_UConverter_fromUnicode_ISO_2022(UConverterFromUnicodeArgs * args,
                    UErrorCode * err);

U_CFUNC void T_UConverter_fromUnicode_ISO_2022_OFFSETS_LOGIC (UConverterFromUnicodeArgs * args,
                    UErrorCode * err);

U_CFUNC UChar32 T_UConverter_getNextUChar_ISO_2022 (UConverterToUnicodeArgs * args,
                    UErrorCode * err);

/***************** ISO-2022-JP ********************************/
U_CFUNC void T_UConverter_fromUnicode_ISO_2022_JP(UConverterFromUnicodeArgs* args, 
                                                  UErrorCode* err);

U_CFUNC void UConverter_toUnicode_ISO_2022_JP(UConverterToUnicodeArgs* args, 
                                              UErrorCode* err);

U_CFUNC void UConverter_toUnicode_ISO_2022_JP_OFFSETS_LOGIC(UConverterToUnicodeArgs* args, 
                                              UErrorCode* err);

U_CFUNC UChar32 UConverter_getNextUChar_ISO_2022_JP (UConverterToUnicodeArgs * args,
                    UErrorCode * err);

/***************** ISO-2022-KR ********************************/
U_CFUNC void UConverter_fromUnicode_ISO_2022_KR(UConverterFromUnicodeArgs* args, 
                                                  UErrorCode* err);

U_CFUNC void UConverter_fromUnicode_ISO_2022_KR_OFFSETS_LOGIC(UConverterFromUnicodeArgs* args, 
                                                              UErrorCode* err);

U_CFUNC void UConverter_toUnicode_ISO_2022_KR(UConverterToUnicodeArgs* args, 
                                              UErrorCode* err);

U_CFUNC void UConverter_toUnicode_ISO_2022_KR_OFFSETS_LOGIC(UConverterToUnicodeArgs* args, 
                                              UErrorCode* err);

U_CFUNC UChar32 UConverter_getNextUChar_ISO_2022_KR (UConverterToUnicodeArgs * args,
                    UErrorCode * err);

/***************** ISO-2022-CN ********************************/
U_CFUNC void UConverter_fromUnicode_ISO_2022_CN(UConverterFromUnicodeArgs* args, 
                                                  UErrorCode* err);

U_CFUNC void UConverter_toUnicode_ISO_2022_CN(UConverterToUnicodeArgs* args, 
                                              UErrorCode* err);

U_CFUNC void UConverter_toUnicode_ISO_2022_CN_OFFSETS_LOGIC(UConverterToUnicodeArgs* args, 
                                              UErrorCode* err);

U_CFUNC UChar32 UConverter_getNextUChar_ISO_2022_CN (UConverterToUnicodeArgs * args,
                    UErrorCode * err);

#define ESC_2022 0x1B /*ESC*/

typedef enum 
{
  INVALID_2022 = -1, /*Doesn't correspond to a valid iso 2022 escape sequence*/
  VALID_NON_TERMINAL_2022 = 0, /*so far corresponds to a valid iso 2022 escape sequence*/
  VALID_TERMINAL_2022 = 1, /*corresponds to a valid iso 2022 escape sequence*/
  VALID_MAYBE_TERMINAL_2022 = 2, /*so far matches one iso 2022 escape sequence, but by adding more characters might match another escape sequence*/
  VALID_SS2_SEQUENCE=3,
  VALID_SS3_SEQUENCE=4

} UCNV_TableStates_2022;

/*
 * The way these state transition arrays work is:
 * ex : ESC$B is the sequence for JISX208
 *      a) First Iteration: char is ESC
 *          i) Get the value of ESC from normalize_esq_chars_2022[] with int value of ESC as index
 *             int x = normalize_esq_chars_2022[27] which is equal to 1
 *         ii) Search for this value in escSeqStateTable_Key_2022[]
 *             value of x is stored at escSeqStateTable_Key_2022[0]
 *        iii) Save this index as offset
 *         iv) Get state of this sequence from escSeqStateTable_Value_2022[]
 *             escSeqStateTable_Value_2022[offset], which is VALID_NON_TERMINAL_2022
 *     b) Switch on this state and continue to next char
 *          i) Get the value of $ from normalize_esq_chars_2022[] with int value of $ as index
 *             which is normalize_esq_chars_2022[36] == 4
 *         ii) x is currently 1(from above) 
 *              x<<=5 -- x is now 32
 *              x+=normalize_esq_chars_2022[36]
 *              now x is 36
 *        iii) Search for this value in escSeqStateTable_Key_2022[]
 *             value of x is stored at escSeqStateTable_Key_2022[2], so offset is 2
 *         iv) Get state of this sequence from escSeqStateTable_Value_2022[]
 *             escSeqStateTable_Value_2022[offset], which is VALID_NON_TERMINAL_2022
 *     c) Switch on this state and continue to next char
 *        i) Get the value of B from normalize_esq_chars_2022[] with int value of B as index
 *         ii) x is currently 36 (from above) 
 *              x<<=5 -- x is now 1152
 *              x+=normalize_esq_chars_2022[66]
 *              now x is 1161
 *        iii) Search for this value in escSeqStateTable_Key_2022[]
 *             value of x is stored at escSeqStateTable_Key_2022[21], so offset is 21
 *         iv) Get state of this sequence from escSeqStateTable_Value_2022[21]
 *             escSeqStateTable_Value_2022[offset], which is VALID_TERMINAL_2022
 *          v) Get the converter name form escSeqStateTable_Result_2022[21] which is JISX208
 */     


/*Below are the 3 arrays depicting a state transition table*/
int8_t normalize_esq_chars_2022[256] = {
/*      0       1       2       3       4       5       6       7       8       9           */

        0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,1      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,4      ,7      ,0      ,0
       ,2      ,24     ,26     ,27     ,0      ,3      ,23     ,6      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,5      ,8      ,9      ,10     ,11     ,12
       ,13     ,14     ,15     ,16     ,17     ,18     ,19     ,20     ,25     ,28
       ,0      ,0      ,21     ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,22     ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0      ,0
       ,0      ,0      ,0      ,0      ,0      ,0
    };

#define MAX_STATES_2022 74
int32_t escSeqStateTable_Key_2022[MAX_STATES_2022] = {
/*      0           1           2           3           4           5           6           7           8           9           */

         1          ,34         ,36         ,39         ,55         ,57         ,60         ,1093       ,1096       ,1097       
        ,1098       ,1099       ,1100       ,1101       ,1102       ,1103       ,1104       ,1105       ,1106       ,1109       
        ,1154       ,1157       ,1160       ,1161       ,1176       ,1178       ,1179       ,1254       ,1257       ,1768       
        ,1773       ,35105      ,36933      ,36936      ,36937      ,36938      ,36939      ,36940      ,36942      ,36943      
        ,36944      ,36945      ,36946      ,36947      ,36948      ,37640      ,37642      ,37644      ,37646      ,37711      
        ,37744      ,37745      ,37746      ,37747      ,37748      ,40133      ,40136      ,40138      ,40139      ,40140      
        ,40141      ,1123363    ,35947624   ,35947625   ,35947626   ,35947627   ,35947629   ,35947630   ,35947631   ,35947635   
        ,35947636   ,35947638};


const char* escSeqStateTable_Result_2022[MAX_STATES_2022] = {
/*      0                   1                       2                3                   4                   5                       6                       7                       8                       9           */

     NULL                   ,NULL               ,NULL               ,NULL               ,NULL               ,NULL                   ,NULL                   ,"latin1"               ,"latin1"               ,"latin1"               
    ,"ibm-865"              ,"ibm-865"          ,"ibm-865"          ,"ibm-865"          ,"ibm-865"          ,"ibm-865"              ,"JISX-201"             ,"JISX-201"             ,"latin1"               ,"latin1"               
    ,NULL                   ,"ibm-955"          ,"GB_2312_80-1"     ,"JISX-208"         ,NULL               ,NULL                   ,NULL                   ,NULL                   ,"UTF8"                 ,"ISO-8859-1"           
    ,"ISO-8859-7"           ,NULL               ,"ibm-955"          ,"bm-367"           ,"ibm-952"          ,"ibm-949"              ,"JISX-212"             ,"ibm-1383"             ,"ibm-952"              ,"ibm-964"              
    ,"ibm-964"              ,"ibm-964"          ,"ibm-964"          ,"ibm-964"          ,"ibm-964"          ,"GB_2312_80-1"         ,"ibm-949"              ,"ISO-IR-165"           ,"CNS-11643-1992,1"     ,"CNS-11643-1992,2"     
    ,"CNS-11643-1992,3"     ,"CNS-11643-1992,4" ,"CNS-11643-1992,5" ,"CNS-11643-1992,6" ,"CNS-11643-1992,7" ,"UTF16_PlatformEndian" ,"UTF16_PlatformEndian" ,"UTF16_PlatformEndian" ,"UTF16_PlatformEndian" ,"UTF16_PlatformEndian" 
    ,"UTF16_PlatformEndian" ,NULL               ,"latin1"           ,"ibm-912"          ,"ibm-913"          ,"ibm-914"              ,"ibm-813"              ,"ibm-1089"             ,"ibm-920"              ,"ibm-915"              
    ,"ibm-915"              ,"latin1"};


UCNV_TableStates_2022 escSeqStateTable_Value_2022[MAX_STATES_2022] = {
/*          0                               1                           2                           3                       4                               5                               6                       7                           8                           9           */
    
         VALID_NON_TERMINAL_2022    ,VALID_NON_TERMINAL_2022    ,VALID_NON_TERMINAL_2022    ,VALID_NON_TERMINAL_2022    ,VALID_NON_TERMINAL_2022    ,VALID_SS2_SEQUENCE         ,VALID_SS2_SEQUENCE         ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_MAYBE_TERMINAL_2022  
        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        
        ,VALID_NON_TERMINAL_2022    ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_NON_TERMINAL_2022    ,VALID_NON_TERMINAL_2022    ,VALID_NON_TERMINAL_2022    ,VALID_NON_TERMINAL_2022    ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        
        ,VALID_TERMINAL_2022        ,VALID_NON_TERMINAL_2022    ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        
        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        
        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        
        ,VALID_TERMINAL_2022        ,VALID_NON_TERMINAL_2022    ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022        
        ,VALID_TERMINAL_2022        ,VALID_TERMINAL_2022};



/*for 2022 looks ahead in the stream
 *to determine the longest possible convertible
 *data stream
 */
static const char* getEndOfBuffer_2022(const char** source,
                                       const char* sourceLimit,
                                       UBool flush); 
/*runs through a state machine to determine the escape sequence - codepage correspondance
 *changes the pointer pointed to be _this->extraInfo
 */
static  void changeState_2022(UConverter* _this,
                             const char** source, 
                             const char* sourceLimit,
                             UBool flush,
                             UErrorCode* err); 

UCNV_TableStates_2022 getKey_2022(char source,
                                  int32_t* key,
                                  int32_t* offset);

static void
_ISO2022Open(UConverter *cnv, const char *name, const char *locale, UErrorCode *errorCode) {
    void *oldContext, *newContext=NULL;
    UConverterFromUCallback oldAction;
/*  cnv->charErrorBufferLength = 3;
    cnv->charErrorBuffer[0] = 0x1b;
    cnv->charErrorBuffer[1] = 0x25;
    cnv->charErrorBuffer[2] = 0x42;*/
    cnv->extraInfo = uprv_malloc (sizeof (UConverterDataISO2022));
    if(cnv->extraInfo != NULL) {
        UConverterDataISO2022 *myConverterData=(UConverterDataISO2022 *) cnv->extraInfo; 
        UConverter **array= myConverterData->myConverterArray;
        ((UConverterDataISO2022 *) cnv->extraInfo)->currentConverter = NULL;
        ((UConverterDataISO2022 *) cnv->extraInfo)->previousConverter = NULL;
        ((UConverterDataISO2022 *) cnv->extraInfo)->fromUnicodeConverter = NULL;
        ((UConverterDataISO2022 *) cnv->extraInfo)->escSeq2022Length = 0;
        ((UConverterDataISO2022 *) cnv->extraInfo)->plane = -1;
        ((UConverterDataISO2022 *) cnv->extraInfo)->shiftValid2Bytes= FALSE;
        cnv->fromUnicodeStatus =FALSE;
        if( (locale != NULL) && (uprv_strlen(locale) > 0) ) {
            myConverterData->currentLocale = (char*) uprv_malloc((sizeof(char) * uprv_strlen(locale)) + 1);
            uprv_strcpy(myConverterData->currentLocale,locale);
        }
        else {
            myConverterData->currentLocale = NULL;
        }

        myConverterData->myConverterArray[0] =NULL;
        if(locale && (uprv_stricmp(locale,"jp")==0 || uprv_stricmp(locale,"ja")==0)){
            myConverterData->myConverterArray[0]=   ucnv_open("ASCII", errorCode );
            myConverterData->myConverterArray[1]=   ucnv_open("ISO8859_1", errorCode);
            myConverterData->myConverterArray[2]=   ucnv_open("ISO8859_7", errorCode);
            myConverterData->myConverterArray[3]=   ucnv_open("jisx-201", errorCode);
            myConverterData->myConverterArray[4]=   ucnv_open("jisx-208", errorCode);
            myConverterData->myConverterArray[5]=   ucnv_open("jisx-212", errorCode);
            myConverterData->myConverterArray[6]=   ucnv_open("GB_2312_80-1", errorCode);
            myConverterData->myConverterArray[7]=   ucnv_open("KSC5601", errorCode);

            myConverterData->myConverterArray[8]=   NULL;
            myConverterData->currentState =0;
            myConverterData->targetIndex = 0;
            myConverterData->sourceIndex =0;
            myConverterData->isEscapeAppended=FALSE;
            myConverterData->isShiftAppended=FALSE;
            while(*array!=NULL){
                ucnv_setFromUCallBack(*array,UCNV_FROM_U_CALLBACK_STOP, 
                newContext, &oldAction,&oldContext, errorCode);
                *array++;
            }
            myConverterData->isFirstBuffer = TRUE;
        }
        else if(locale && (uprv_stricmp(locale,"kr")==0 || uprv_stricmp(locale,"ko")==0)){
            cnv->charErrorBufferLength = 4;
            cnv->charErrorBuffer[0] = 0x1b;
            cnv->charErrorBuffer[1] = 0x24;
            cnv->charErrorBuffer[2] = 0x29;
            cnv->charErrorBuffer[3] = 0x43;
            ((UConverterDataISO2022 *) cnv->extraInfo)->fromUnicodeConverter  = ucnv_open("ibm-949",errorCode);
        }
        else if(locale && (uprv_stricmp(locale,"cn")==0 || uprv_stricmp(locale,"zh")==0)){

            myConverterData->myConverterArray[0] = ucnv_open("ASCII",errorCode);
            myConverterData->myConverterArray[1] = ucnv_open("GB_2312_80-1",errorCode);
            myConverterData->myConverterArray[2] = ucnv_open("ISO-IR-165",errorCode);
            myConverterData->myConverterArray[3] = ucnv_open("CNS-11643-1992",errorCode);
            myConverterData->myConverterArray[4] = NULL;
            myConverterData->currentState =ASCII;
            myConverterData->targetIndex = 0;
            myConverterData->sourceIndex =0;
            myConverterData->isEscapeAppended=FALSE;
            myConverterData->isShiftAppended=FALSE;
              
        }
        else{
            cnv->charErrorBufferLength = 3;
            cnv->charErrorBuffer[0] = 0x1b;
            cnv->charErrorBuffer[1] = 0x25;
            cnv->charErrorBuffer[2] = 0x42;
            myConverterData->currentLocale=NULL;
        }

    } else {
        *errorCode = U_MEMORY_ALLOCATION_ERROR;
    }

}


static void
_ISO2022Close(UConverter *converter) {
    UConverter **array = ((UConverterDataISO2022 *) (converter->extraInfo))->myConverterArray;
    
    if (converter->extraInfo != NULL) {
        ucnv_close (((UConverterDataISO2022 *) (converter->extraInfo))->currentConverter);
        if(((UConverterDataISO2022 *) (converter->extraInfo))->previousConverter){
            ucnv_close (((UConverterDataISO2022 *) (converter->extraInfo))->previousConverter);
        }
        /*close the array of converter pointers and free the memory*/
        while(*array!=NULL){
            ucnv_close(*array++);
        }
        uprv_free(((UConverterDataISO2022 *) (converter->extraInfo))->currentLocale);
        uprv_free (converter->extraInfo);
    }
}

static void
_ISO2022Reset(UConverter *converter) {
    if(!((UConverterDataISO2022 *) (converter->extraInfo))->currentLocale){
        converter->charErrorBufferLength = 3;
        converter->charErrorBuffer[0] = 0x1b;
        converter->charErrorBuffer[1] = 0x28;
        converter->charErrorBuffer[2] = 0x42;
    }
  if (converter->mode == UCNV_SO)
    {
 /*     converter->charErrorBufferLength = 3;
      converter->charErrorBuffer[0] = 0x1b;
      converter->charErrorBuffer[1] = 0x25;
      converter->charErrorBuffer[2] = 0x42;*/
      ucnv_close (((UConverterDataISO2022 *) (converter->extraInfo))->currentConverter);
      ((UConverterDataISO2022 *) (converter->extraInfo))->currentConverter = NULL;
      ((UConverterDataISO2022 *) (converter->extraInfo))->escSeq2022Length = 0;
      converter->mode = UCNV_SI;
    }
}

static const UConverterImpl _ISO2022Impl={
    UCNV_ISO_2022,

    NULL,
    NULL,

    _ISO2022Open,
    _ISO2022Close,
    _ISO2022Reset,

    T_UConverter_toUnicode_ISO_2022,
    T_UConverter_toUnicode_ISO_2022_OFFSETS_LOGIC,
    T_UConverter_fromUnicode_ISO_2022,
    T_UConverter_fromUnicode_ISO_2022_OFFSETS_LOGIC,
    T_UConverter_getNextUChar_ISO_2022,

    NULL
};

const UConverterStaticData _ISO2022StaticData={
  sizeof(UConverterStaticData),
  "ISO_2022",
    2022, UCNV_IBM, UCNV_ISO_2022, 1, 4,
    { 0x1a, 0, 0, 0 },1, FALSE, FALSE,
  { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0} /* reserved */
};


const UConverterSharedData _ISO2022Data={
    sizeof(UConverterSharedData), ~((uint32_t) 0),
    NULL, NULL, &_ISO2022StaticData, FALSE, &_ISO2022Impl, 
    0
};

/**********************************************************************************
 *  ISO-2022 Converter
 *
 *
 */

U_CFUNC UChar32 T_UConverter_getNextUChar_ISO_2022(UConverterToUnicodeArgs* args,
                                     UErrorCode* err)
{
    const char* mySourceLimit;
    /*Arguments Check*/
    if  (args->sourceLimit < args->source){
        *err = U_ILLEGAL_ARGUMENT_ERROR;
        return 0xffff;
    }
    if(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale){
        
        if(uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "jp") ==0 ||
                uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "ja") ==0){
            return UConverter_getNextUChar_ISO_2022_JP(args,err);
        }
        else if(uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "kr") ==0 ||
                uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "ko") ==0){
            return UConverter_getNextUChar_ISO_2022_KR(args,err);
        }
        else if(uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "cn") ==0 ||
                uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "zh") ==0){
            return UConverter_getNextUChar_ISO_2022_CN(args,err);
        }
    }

    do{

        mySourceLimit =  getEndOfBuffer_2022(&(args->source), args->sourceLimit, TRUE); 
        /*Find the end of the buffer e.g : Next Escape Seq | end of Buffer*/
        if (args->converter->mode == UCNV_SO) /*Already doing some conversion*/{
  
          return ucnv_getNextUChar(((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter,
                                   &(args->source),
                                   mySourceLimit,
                                   err);
        }
        /*-Done with buffer with entire buffer
         *-Error while converting
         */
        changeState_2022(args->converter,
                       &(args->source), 
                       args->sourceLimit,
                       TRUE,
                       err);
    }while(args->source < args->sourceLimit);

    return 0xffff;
}


U_CFUNC void T_UConverter_fromUnicode_ISO_2022(UConverterFromUnicodeArgs *args,
                                       UErrorCode* err)
{   
    UConverterDataISO2022 *myConverterData=(UConverterDataISO2022*)args->converter->extraInfo;
    const char *locale =myConverterData->currentLocale;
    if(locale && (uprv_stricmp(locale,"jp")==0 || uprv_stricmp(locale,"ja")==0)){
        T_UConverter_fromUnicode_ISO_2022_JP(args,err);
    }
    else if(locale && ( uprv_stricmp(locale,"kr")==0 || uprv_stricmp(locale,"ko")==0)){
        UConverter_fromUnicode_ISO_2022_KR(args,err);

    }else if(locale && ( uprv_stricmp(locale,"cn")==0 || uprv_stricmp(locale,"zh")==0)){
        UConverter_fromUnicode_ISO_2022_CN(args,err);
    }
    else{
        T_UConverter_fromUnicode_UTF8(args, err);
    }
}


U_CFUNC void T_UConverter_fromUnicode_ISO_2022_OFFSETS_LOGIC(UConverterFromUnicodeArgs* args,
                                                                    UErrorCode* err)
{
    
      char const* targetStart = args->target;
    UConverterDataISO2022 *myConverterData=(UConverterDataISO2022*)args->converter->extraInfo;
    const char *locale =myConverterData->currentLocale;
    if(locale && (uprv_stricmp(locale,"jp")==0 || uprv_stricmp(locale,"ja")==0)){
        T_UConverter_fromUnicode_ISO_2022_JP(args,err);
    }
    else if(locale && ( uprv_stricmp(locale,"kr")==0 || uprv_stricmp(locale,"ko")==0)){
        UConverter_fromUnicode_ISO_2022_KR_OFFSETS_LOGIC(args,err);
    }    
    else if(locale && ( uprv_stricmp(locale,"cn")==0 || uprv_stricmp(locale,"zh")==0)){
        UConverter_fromUnicode_ISO_2022_CN(args,err);
    }
    else{
      T_UConverter_fromUnicode_UTF8_OFFSETS_LOGIC(args, err);
      {

        int32_t len = args->target - targetStart;
        int32_t i;
        /* uprv_memmove(offsets+3, offsets, len);   MEMMOVE SEEMS BROKEN --srl*/ 

        for(i=len-1;i>=0;i--)       args->offsets[i] = args->offsets[i];
      }

  }
}


U_CFUNC void T_UConverter_toUnicode_ISO_2022(UConverterToUnicodeArgs *args,
                                     UErrorCode* err){

    const char *mySourceLimit;
    char const* sourceStart;
    UConverter *saveThis;

    /*Arguments Check*/
    if (U_FAILURE(*err)) 
        return;

    if ((args->converter == NULL) || (args->targetLimit < args->target) || (args->sourceLimit < args->source)){
      *err = U_ILLEGAL_ARGUMENT_ERROR;
      return;
    }
    if(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale){
        
        if(uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "jp") ==0 ||
                uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "ja") ==0){
            UConverter_toUnicode_ISO_2022_JP(args,err);
            return;
        }
        else if(uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "kr") ==0 ||
                uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "ko") ==0){
            UConverter_toUnicode_ISO_2022_KR(args,err);
            return;
        }
        else if(uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "cn") ==0 ||
                uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "zh") ==0){
            UConverter_toUnicode_ISO_2022_CN(args,err);
            return;
        }


    }
    
    do{
		
		/*Find the end of the buffer e.g : Next Escape Seq | end of Buffer*/
		mySourceLimit =  getEndOfBuffer_2022(&(args->source), args->sourceLimit, args->flush); 
		
 		if (args->converter->mode == UCNV_SO) /*Already doing some conversion*/{

			saveThis = args->converter;
			args->offsets = NULL;
			args->converter = ((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter;
			ucnv_toUnicode(args->converter,
				  &args->target,
				  args->targetLimit,
				  &args->source,
				  mySourceLimit,
				  args->offsets,
				  args->flush,
				  err);
			args->converter = saveThis;
		}
		/* in ISO-2022-jp the characters preceeding any escape sequence are assumed
		 * to be ASCII so we need to explicitly check for it
		 */
		if((((UConverterDataISO2022 *)args->converter->extraInfo)->isFirstBuffer) && (args->source[0]!=(char)ESC_2022)
						&&  (((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter==NULL)){

		
				saveThis = args->converter;
				args->offsets = NULL;
				((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter = ucnv_open("ASCII",err);

				if(U_FAILURE(*err)){
					break;
				}

				args->converter = ((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter;
				ucnv_toUnicode(args->converter,
					&args->target,
					args->targetLimit,
					&args->source,
					mySourceLimit,
					args->offsets,
					args->flush,
					err);
				args->converter = saveThis;
				args->converter->mode = UCNV_SO;
				((UConverterDataISO2022*)(args->converter->extraInfo))->isFirstBuffer=FALSE;
			
		}

		/*-Done with buffer with entire buffer
		  -Error while converting
		*/

		if (U_FAILURE(*err) || (args->source == args->sourceLimit)) 
			return;

		sourceStart = args->source;
		changeState_2022(args->converter,
						   &(args->source), 
						   args->sourceLimit,
						   args->flush,
						   err);
		/* args->source = sourceStart; */
			

	}while(args->source < args->sourceLimit);

	((UConverterDataISO2022*)(args->converter->extraInfo))->isFirstBuffer=FALSE;

	return;
}

U_CFUNC void T_UConverter_toUnicode_ISO_2022_OFFSETS_LOGIC(UConverterToUnicodeArgs* args,
                                                          UErrorCode* err){

    int32_t myOffset=0;
    int32_t base = 0;
    const char* mySourceLimit;
    char const* sourceStart;
    UConverter* saveThis = NULL;

    /*Arguments Check*/
    if (U_FAILURE(*err)) 
        return;
    if ((args->converter == NULL) || (args->targetLimit < args->target) || (args->sourceLimit < args->source)){
        *err = U_ILLEGAL_ARGUMENT_ERROR;
        return;
    }
    if(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale){

        if(uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "kr") ==0 ||
                uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "ko") ==0){
            UConverter_toUnicode_ISO_2022_KR(args,err);
            return;
        }
       else if(uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "cn") ==0 ||
                uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "zh") ==0){
            UConverter_toUnicode_ISO_2022_CN_OFFSETS_LOGIC(args,err);
            return;
        }
        else if(uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "cn") ==0 ||
                 uprv_strcmp(((UConverterDataISO2022*)(args->converter->extraInfo))->currentLocale, "zh") ==0){
            UConverter_toUnicode_ISO_2022_CN(args,err);
            return;
        }
    }
    	
    do{
		mySourceLimit =  getEndOfBuffer_2022(&(args->source), args->sourceLimit, args->flush); 
		/*Find the end of the buffer e.g : Next Escape Seq | end of Buffer*/

		if (args->converter->mode == UCNV_SO) /*Already doing some conversion*/{
			const UChar* myTargetStart = args->target;

			saveThis = args->converter;
			args->converter = ((UConverterDataISO2022*)(saveThis->extraInfo))->currentConverter;
			ucnv_toUnicode(args->converter, 
							&(args->target),
							args->targetLimit,
							&(args->source),
							mySourceLimit,
							args->offsets,
							args->flush,
							err);

			args->converter = saveThis;
			{
				int32_t lim =  args->target - myTargetStart;
				int32_t i = 0;
				for (i=base; i < lim;i++){   
					args->offsets[i] += myOffset;
				}
				base += lim;
			}
		
		}
		if(((UConverterDataISO2022 *)args->converter->extraInfo)->isFirstBuffer && args->source[0]!=ESC_2022
			&& ((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter==NULL){

			const UChar* myTargetStart = args->target;
			UConverter* saveThis = args->converter;
			args->offsets = NULL;
			((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter = ucnv_open("ASCII",err);

			if(U_FAILURE(*err)){
				break;
			}

			args->converter = ((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter;
			ucnv_toUnicode(args->converter,
				&args->target,
				args->targetLimit,
				&args->source,
				mySourceLimit,
				args->offsets,
				args->flush,
				err);
			args->converter = saveThis;
			args->converter->mode = UCNV_SO;
			((UConverterDataISO2022*)(args->converter->extraInfo))->isFirstBuffer=FALSE;
						args->converter = saveThis;
			{
				int32_t lim =  args->target - myTargetStart;
				int32_t i = 0;
				for (i=base; i < lim;i++){   
					args->offsets[i] += myOffset;
				}
				base += lim;
			}
		}
		/*-Done with buffer with entire buffer
		-Error while converting
		*/

		if (U_FAILURE(*err) || (args->source == args->sourceLimit)) 
			return;

		sourceStart = args->source;
		changeState_2022(args->converter,
						&(args->source), 
						args->sourceLimit,
						args->flush,
						err);
		myOffset += args->source - sourceStart;

	}while(mySourceLimit != args->sourceLimit);
	
	return;
}
UCNV_TableStates_2022 getKey_2022(char c,
                                  int32_t* key,
                                  int32_t* offset){
    int32_t togo = *key;
    int32_t low = 0;
    int32_t hi = MAX_STATES_2022;
    int32_t oldmid=0;

    if (*key == 0){
        togo = (int8_t)normalize_esq_chars_2022[(int)c];
    }
    else{
        togo <<= 5;
        togo += (int8_t)normalize_esq_chars_2022[(int)c];
    }

    while (hi != low)  /*binary search*/{

        register int32_t mid = (hi+low) >> 1; /*Finds median*/

        if (mid == oldmid) 
          break;

        if (escSeqStateTable_Key_2022[mid] > togo){
          hi = mid;
        }
        else if (escSeqStateTable_Key_2022[mid] < togo){  
          low = mid;
        }
        else /*we found it*/{
          *key = togo;
          *offset = mid;
          return escSeqStateTable_Value_2022[mid];
        }
        oldmid = mid;

    }

    *key = 0;
    *offset = 0;
    return INVALID_2022;
}



static void changeState_2022(UConverter* _this,
                      const char** source, 
                      const char* sourceLimit,
                      UBool flush,
                      UErrorCode* err){
    UConverter* myUConverter;
    uint32_t key = _this->toUnicodeStatus;
    UCNV_TableStates_2022 value;
    UConverterDataISO2022* myData2022 = ((UConverterDataISO2022*)_this->extraInfo);
    const char* chosenConverterName = NULL;
    const char* sourceStart =*source;
    int32_t offset;

    /*In case we were in the process of consuming an escape sequence
    we need to reprocess it */

    do{

        /* Needed explicit cast for key on MVS to make compiler happy - JJD */
        if(**source == UCNV_SI || **source==UCNV_SO){
            if(sourceStart == *source)
                 (*source)++;
            return;
        }
        value = getKey_2022(**source,(int32_t *) &key, &offset);
        switch (value){
            case VALID_NON_TERMINAL_2022 : 
                break;
  
            case VALID_TERMINAL_2022:
                {
                    (*source)++;
                    chosenConverterName = escSeqStateTable_Result_2022[offset];
                    key = 0;
                    goto DONE;
                };
                break;
  
            case INVALID_2022:
                {
                    _this->toUnicodeStatus = 0;
                    *err = U_ILLEGAL_ESCAPE_SEQUENCE;
                    return;
                }
            case VALID_SS2_SEQUENCE:
                {
                    (*source)++;
                    key = 0;
                    goto DONE;
                }
  
            case VALID_MAYBE_TERMINAL_2022:
                {
                    const char* mySource = (*source+1);
                    int32_t myKey = key;
                    UCNV_TableStates_2022 myValue = value;
                    int32_t myOffset=0;
                    if(*mySource==ESC_2022){
                        while ((mySource < sourceLimit) && 
                               ((myValue == VALID_MAYBE_TERMINAL_2022)||(myValue == VALID_NON_TERMINAL_2022))){
                            myValue = getKey_2022(*(mySource++), &myKey, &myOffset);
                        }
                    }
                    else{
                        (*source)++;
                        myValue=(UCNV_TableStates_2022) 1;
                        myOffset = 7;
                    }

                    switch (myValue){
                        case INVALID_2022:
                            {
                                /*Backs off*/
                                chosenConverterName = escSeqStateTable_Result_2022[offset];
                                value = VALID_TERMINAL_2022;
                                goto DONE;
                            };
                            break;
      
                        case VALID_TERMINAL_2022:
                            {
                                 /*uses longer escape sequence*/
                                chosenConverterName = escSeqStateTable_Result_2022[myOffset];
                                key = 0;
                                value = VALID_TERMINAL_2022;
                                goto DONE;
                            };
                            break;

                        /* Not expected. Added to make the gcc happy */
                        case VALID_SS2_SEQUENCE:
                            {
                                (*source)++;
                                key = 0;
                                goto DONE;
                            }
  
                        case VALID_NON_TERMINAL_2022: 

                        case VALID_MAYBE_TERMINAL_2022:
                            {
                                if (flush){
                                    /*Backs off*/
                                    chosenConverterName = escSeqStateTable_Result_2022[offset];
                                    value = VALID_TERMINAL_2022;
                                    key = 0;
                                    goto DONE;
                                }
                                else{
                                    key = myKey;
                                    value = VALID_NON_TERMINAL_2022;
                                }
                            };
                            break;
                    };
                    break;
                };
                break;
        }
    }while (++(*source) < sourceLimit);

    DONE:
    _this->toUnicodeStatus = key;

    if ((value == VALID_NON_TERMINAL_2022) || (value == VALID_MAYBE_TERMINAL_2022)) {
      return;
    }
    if (value > 0 ) {
        if(value==3){
            _this->mode = UCNV_SI;
            myUConverter =myData2022->currentConverter;
        }
        else if(uprv_strcmp(chosenConverterName,"latin1")==0 && (uprv_stricmp(myData2022->currentLocale,"jp")==0 ||
                    uprv_stricmp(myData2022->currentLocale,"ja")==0)){
            /* 
             * In ISO-2022-JP2 encoding there must be a switch to ASCII or to JIS X 0201-Roman before a
             * space character (but notnecessarily before "ESC 4/14 2/0" or "ESC N ' '") or control
             * characters such as tab or CRLF.  This means that the next line starts in the character set that 
             * was switched to before the end of the previous line.  
             *  
             */
   
            _this->mode = UCNV_SI;
            myData2022->previousConverter =myData2022->currentConverter;
            myData2022->currentConverter = myUConverter = ucnv_open(chosenConverterName, err);

        }
        else{
            _this->mode = UCNV_SI;
            ucnv_close(myData2022->currentConverter);
            myData2022->currentConverter = myUConverter = ucnv_open(chosenConverterName, err);

        }
        if (U_SUCCESS(*err)){
            /*Customize the converter with the attributes set on the 2022 converter*/
            myUConverter->fromUCharErrorBehaviour = _this->fromUCharErrorBehaviour;
            myUConverter->fromUContext = _this->fromUContext;
            myUConverter->fromCharErrorBehaviour = _this->fromCharErrorBehaviour;
            myUConverter->toUContext = _this->toUContext;

            uprv_memcpy(myUConverter->subChar, 
                       _this->subChar,
                       myUConverter->subCharLen = _this->subCharLen);

            _this->mode = UCNV_SO;
        }
    }

    return;
}

/*Checks the characters of the buffer against valid 2022 escape sequences
 *if the match we return a pointer to the initial start of the sequence otherwise
 *we return sourceLimit
 */
static const char* getEndOfBuffer_2022(const char** source,
                                const char* sourceLimit,
                                UBool flush){

    const char* mySource = *source;

    if (*source >= sourceLimit) 
        return sourceLimit;

    do{

        if (*mySource == ESC_2022){
            int8_t i;
            int32_t key = 0;
            int32_t offset;
            UCNV_TableStates_2022 value = VALID_NON_TERMINAL_2022;

            /* Kludge: I could not
             * figure out the reason for validating an escape sequence
             * twice - once here and once in changeState_2022(). 
             * is it possible to have an ESC character in a ISO2022
             * byte stream which is valid in a code page? Is it legal?
             */
            for (i=0; 
                    (mySource+i < sourceLimit)&&(value == VALID_NON_TERMINAL_2022);
                    i++) {
              value =  getKey_2022(*(mySource+i), &key, &offset);
            }
            if (value > 0) 
              return mySource;

            if ((value == VALID_NON_TERMINAL_2022)&&(!flush) ) 
                return sourceLimit;
        }
        else if(*mySource == (char)UCNV_SI || *mySource==(char)UCNV_SO){
            return mySource;
           
        }
    
    }while (mySource++ < sourceLimit);

    return sourceLimit;
}


/**************************************ISO-2022-JP*************************************************/

/************************************** IMPORTANT **************************************************
 * The T_fromUnicode_ISO2022_JP converter doesnot use ucnv_fromUnicode() functions for SBCS,DBCS and
 * MBCS instead the values are obtained directly by accessing the sharedData structs through ucmp8_getU() 
 * ucmp16_getU() macros,and for MBCS by emulating the Markus's code to increase speed, reduce the 
 * overhead of function call and make it efficient.The converter iterates over each Unicode codepoint 
 * to obtain the equivalent codepoints from the codepages supported. Since the source buffer is 
 * processed one char at a time it would make sense to reduce the extra processing a canned converter 
 * would do as far as possible.
 *
 * If the implementation of these macros or structure of sharedData struct change in the future, make 
 * sure that ISO-2022 is also changed. 
 ***************************************************************************************************
 */

/***************************************************************************************************
 * Rules for ISO-2022-jp encoding
 * (i)   Escape sequences must be fully contained within a line they should not 
 *       span new lines or CRs
 * (ii)  If the last character on a line is represented by two bytes then an ASCII or
 *       JIS-Roman character escape sequence should follow before the line terminates
 * (iii) If the first character on the line is represented by two bytes then a two 
 *       byte character escape sequence should precede it    
 * (iv)  If no escape sequence is encountered then the characters are ASCII
 * (v)   Latin(ISO-8859-1) and Greek(ISO-8859-7) characters must be designated to G2,
 *       and invoked with SS2 (ESC N).
 * (vi)  If there is any G0 designation in text, there must be a switch to
 *       ASCII or to JIS X 0201-Roman before a space character (but not
 *       necessarily before "ESC 4/14 2/0" or "ESC N ' '") or control
 *       characters such as tab or CRLF.
 * (vi)  Supported encodings:
 *          ASCII, JISX201, JISX208, JISX212, GB2312, KSC5601, ISO-8859-1,ISO-8859-7
 *
 *  source : RFC-1554
 *
 *          JISX201, JISX208,JISX212 : new .cnv data files created
 *          KSC5601 : alias to ibm-949 mapping table
 *          GB2312 : alias to ibm-1386 mapping table    
 *          ISO-8859-1 : Algorithmic implemented as LATIN1 case
 *          ISO-8859-7 : alisas to ibm-9409 mapping table
 */


static Cnv2022Type myConverterType[8]={
    SBCS,
    LATIN1,
    SBCS,
    SBCS,
    DBCS,
    DBCS,
    DBCS,
    MBCS,

};


static const char* escSeqChars[8] ={
    "\x1B\x28\x42",
    "\x1B\x2E\x41",
    "\x1B\x2E\x46",
    "\x1B\x28\x4A", 
    "\x1B\x24\x42",
    "\x1B\x24\x28\x44",
    "\x1B\x24\x41", 
    "\x1B\x24\x28\x43", 

};


static void concatChar(UConverterFromUnicodeArgs* args, int32_t *targetIndex, int32_t *targetLength,
                  int8_t charToAppend,UErrorCode* err);

static void concatEscape(UConverterFromUnicodeArgs* args, int32_t *targetIndex, int32_t *targetLength,
                  const char* strToAppend,UErrorCode* err,int len);

static void concatString(UConverterFromUnicodeArgs* args, int32_t *targetIndex, int32_t *targetLength,
                  const UChar32* strToAppend,UErrorCode* err,int32_t *sourceIndex);

/*
 * The iteration over various code pages works this way:
 * i)   Get the currentState from myConverterData->currentState
 * ii)  Check if the character is mapped to a valid character in the currentState
 *      Yes ->  a) set the initIterState to currentState
 *              b) remain in this state until an invalid character is found
 *      No  ->  a) go to the next code page and find the character
 * iii) Before changing the state increment the current state check if the current state 
 *      is equal to the intitIteration state
 *      Yes ->  A character that cannot be represented in any of the supported encodings
 *              break and return a U_INVALID_CHARACTER error
 *      No  ->  Continue and find the character in next code page
 *
 * Offsets Logic is handled by utility functions concatChar(), concatEscape() and concatString()
 *
 * TODO: Implement a priority technique where the users are allowed to set the priority of code pages 
 */


U_CFUNC void T_UConverter_fromUnicode_ISO_2022_JP(UConverterFromUnicodeArgs* args, UErrorCode* err){
    UChar* mySource =(UChar*)args->source;

    UConverterDataISO2022 *myConverterData=(UConverterDataISO2022*)args->converter->extraInfo;
    UConverterCallbackReason reason;
    UBool isEscapeAppended = FALSE;
    StateEnum initIterState;
    unsigned char *myTarget = (unsigned char *) args->target; 
    const UChar *saveSource;
    char *saveTarget;
    uint32_t targetValue=0;
    int32_t *saveOffsets ;
    int32_t myTargetLength = args->targetLimit - args->target;
    int32_t mySourceLength = args->sourceLimit - args->source;
    int32_t mySourceIndex = 0;
    int32_t myTargetIndex = 0;
    int32_t length  =0;
    CompactShortArray *myFromUnicodeDBCS = NULL;
    CompactShortArray *myFromUnicodeDBCSFallback = NULL;
    CompactByteArray  *myFromUnicodeSBCS = NULL;
    CompactByteArray  *myFromUnicodeSBCSFallback = NULL;
    UChar32 targetUniChar = missingCharMarker;
    StateEnum currentState=ASCII;
    Cnv2022Type myType;
    UChar mySourceChar = 0x0000;
    int iterCount = 0;
    const char *escSeq = NULL;
    UBool isShiftAppended = FALSE;
    UBool isTargetUCharDBCS=FALSE,oldIsTargetUCharDBCS=FALSE; 

    mySourceIndex = myConverterData->sourceIndex;
    myTargetIndex = myConverterData->targetIndex;
    isEscapeAppended =(UBool) myConverterData->isEscapeAppended;
    isShiftAppended =(UBool) myConverterData->isShiftAppended;
    initIterState =ASCII;
    /* arguments check*/
    if ((args->converter == NULL) || (args->targetLimit < args->target) || (args->sourceLimit < args->source)){
      *err = U_ILLEGAL_ARGUMENT_ERROR;
      return;
    }

    while(mySourceIndex <  mySourceLength){
        currentState = myConverterData->currentState;
        myConverterData->fromUnicodeConverter = (myConverterData->fromUnicodeConverter == NULL) ?
                                            myConverterData->myConverterArray[0] :
                                            myConverterData->myConverterArray[(int)myConverterData->currentState];
        isTargetUCharDBCS   = (UBool) args->converter->fromUnicodeStatus;

        if(myTargetIndex < myTargetLength){

            mySourceChar = (UChar) args->source[mySourceIndex++];

            myType= (Cnv2022Type) myConverterType[currentState];

            /* I am handling surrogates in the begining itself so that I donot have to go through 8 
             * iterations on codepages that we support. 
             */
            if(UTF_IS_LEAD(mySourceChar)){
                    
                args->converter->invalidUCharBuffer[0] = (UChar)mySource[mySourceIndex - 1];
                args->converter->invalidUCharLength = 1;

                /*mySourceIndex has already been incremented*/
                if(mySourceIndex < mySourceLength){
                    if(UTF_IS_TRAIL(mySource[mySourceIndex])){
                          args->converter->invalidUCharBuffer[1] = (UChar)mySource[mySourceIndex];
                          args->converter->invalidUCharLength++;
                          mySourceIndex++;
                          continue;
                    }
                    else if (args->flush == TRUE){
                        reason = UCNV_ILLEGAL;
                        *err = U_TRUNCATED_CHAR_FOUND;
                        goto CALLBACK;
                    } 
                    else{
                        reason=UCNV_ILLEGAL;
                        goto CALLBACK;
                    }
                }
                else{
                    args->converter->invalidUCharBuffer[1] = (UChar)mySource[mySourceIndex];
                    continue;
                }
            }
            else if(UTF_IS_TRAIL(mySourceChar)){
                if(args->converter->fromUSurrogateLead == 0){
                    reason = UCNV_ILLEGAL;
                    goto CALLBACK;
                }
                else{
                    /* the only way we can arrive here is if UTF lead surrogate was found
                     * at the end of previous buffer. So we need to check if the current
                     * current source index is 0 or not 
                     */
                    if(mySourceIndex-1 ==0){
                          args->converter->invalidUCharBuffer[1] = (UChar)mySource[mySourceIndex];
                          args->converter->invalidUCharLength++;
                          mySourceIndex++;
                          continue;
                    }
                    else{
                        reason=UCNV_ILLEGAL;
                        goto CALLBACK;
                    }
                }
            }

            /*Do the conversion*/
            else if(mySourceChar == 0x0020){
                targetUniChar = mySourceChar;
                if(currentState > 2){
                    concatEscape(args, &myTargetIndex, &myTargetLength, escSeqChars[0],err,strlen(escSeqChars[0]));

                    TEST_ERROR_CONDITION(args,myTargetIndex, mySourceIndex, isTargetUCharDBCS,myConverterData, err);
                }
            }
            /* if the source character is CR or LF then append the ASCII escape sequence*/
            else if(mySourceChar== 0x000A || mySourceChar== 0x000D || mySourceChar==0x0009 || mySourceChar==0x000B){

                if(isTargetUCharDBCS && mySource[mySourceIndex-2]!=0x000A){
                    concatEscape(args, &myTargetIndex, &myTargetLength, escSeqChars[0],err,strlen(escSeqChars[0]));
                    isTargetUCharDBCS=FALSE;
                    isShiftAppended =FALSE;
                    myConverterData->isEscapeAppended=isEscapeAppended=FALSE;
                    myConverterData->isShiftAppended=FALSE;
                    TEST_ERROR_CONDITION(args,myTargetIndex, mySourceIndex, isTargetUCharDBCS,myConverterData, err);
                }

                targetUniChar = mySourceChar;
                concatString(args, &myTargetIndex, &myTargetLength,&targetUniChar,err,&mySourceIndex);

                if(currentState==ISO8859_1 || currentState ==ISO8859_7)
                    isEscapeAppended =FALSE;
                
                TEST_ERROR_CONDITION(args,myTargetIndex, mySourceIndex, isTargetUCharDBCS,myConverterData, err);
                
                continue;
            }
            else{
            
                switch (myType){

                    case SBCS:
                        myFromUnicodeSBCS = &myConverterData->fromUnicodeConverter->sharedData->table->sbcs.fromUnicode;
                        myFromUnicodeSBCSFallback = &myConverterData->fromUnicodeConverter->sharedData->table->sbcs.fromUnicodeFallback;

                        targetUniChar = (UChar32) ucmp8_getu (myFromUnicodeSBCS, mySourceChar);

                        if ((targetUniChar==0)&&(myConverterData->fromUnicodeConverter->useFallback == TRUE) &&
                            (myConverterData->fromUnicodeConverter->sharedData->staticData->hasFromUnicodeFallback == TRUE)){
                             targetUniChar = (UChar32) ucmp8_getu (myFromUnicodeSBCSFallback, mySourceChar);
                        }
                        /* ucmp8_getU returns 0 for missing char so explicitly set it missingCharMarker*/
                        targetUniChar=(UChar)((targetUniChar==0) ? (UChar) missingCharMarker : targetUniChar);
                        break;
                        
                    case DBCS:
                        
                        myFromUnicodeDBCS = &myConverterData->fromUnicodeConverter->sharedData->table->dbcs.fromUnicode;
                        myFromUnicodeDBCSFallback = &myConverterData->fromUnicodeConverter->sharedData->table->dbcs.fromUnicodeFallback;
                        targetUniChar = (UChar) ucmp16_getu (myFromUnicodeDBCS, mySourceChar);
                        
                        if ((targetUniChar==missingCharMarker)&&(myConverterData->fromUnicodeConverter->useFallback == TRUE) &&
                                (myConverterData->fromUnicodeConverter->sharedData->staticData->hasFromUnicodeFallback == TRUE)){
                             targetUniChar = (UChar) ucmp16_getu (myFromUnicodeDBCSFallback, mySourceChar);
                        }
                        break;

                    case MBCS:
                        length= _MBCSFromUChar32(myConverterData->fromUnicodeConverter->sharedData,
                                                mySourceChar,&targetValue,args->converter->useFallback);
                        
                        targetUniChar = (UChar32) targetValue;
            
                       if(length==0x0000){
                            targetUniChar = missingCharMarker;
                            *err =U_ZERO_ERROR;
                       } 
                        /* only DBCS or SBCS characters are expected*/
                       else if(length > 2){
                            reason =UCNV_ILLEGAL;
                            *err =U_INVALID_CHAR_FOUND;
                            goto CALLBACK;
                        }
                        break;

                    case LATIN1:
                        if(mySourceChar < 0x0100){
                            targetUniChar = mySourceChar;
                        } else targetUniChar = missingCharMarker;
                        break;

                    default:
                        /*not expected */ 
                        break;
                }
            }

            if(targetUniChar!= missingCharMarker){
                
                oldIsTargetUCharDBCS = isTargetUCharDBCS;
                isTargetUCharDBCS =(UBool) (targetUniChar >0x00FF);
                args->converter->fromUnicodeStatus= isTargetUCharDBCS;
                /* set the iteration state and iteration count  */          
                initIterState = currentState;
                iterCount =0;
                /* Append the escpace sequence */
                if(!isEscapeAppended){
                    escSeq = escSeqChars[(int)currentState];
                    concatEscape(args, &myTargetIndex, &myTargetLength, 
                                        escSeqChars[(int)currentState],
                                        err,strlen(escSeqChars[(int)currentState]));
                    
                    isEscapeAppended =TRUE;
                    myConverterData->isEscapeAppended=TRUE;

                    TEST_ERROR_CONDITION(args,myTargetIndex, mySourceIndex, isTargetUCharDBCS,myConverterData, err);

                    /* Append SSN for shifting to G2 */
                    if(currentState==ISO8859_1 || currentState==ISO8859_7){
                        concatEscape(args, &myTargetIndex, &myTargetLength,
                                    UCNV_SS2,err,strlen(UCNV_SS2));

                        TEST_ERROR_CONDITION(args,myTargetIndex, mySourceIndex, isTargetUCharDBCS,myConverterData, err);
                    }
                }
                else{

                    if(oldIsTargetUCharDBCS != isTargetUCharDBCS  ){
                        /*Shifting from a double byte to single byte mode*/
                        if(!isTargetUCharDBCS){

                            concatChar(args, &myTargetIndex, 
                                        &myTargetLength, UCNV_SI,err);
                            isShiftAppended =FALSE;
                            
                            TEST_ERROR_CONDITION(args,myTargetIndex, mySourceIndex, isTargetUCharDBCS,myConverterData, err);
                        }
                        else{ /* Shifting from a single byte to double byte mode*/
                                concatChar(args, &myTargetIndex, 
                                    &myTargetLength, UCNV_SO,err);
                            isShiftAppended =TRUE;
                            myConverterData->isShiftAppended =isShiftAppended;
                            
                            TEST_ERROR_CONDITION(args,myTargetIndex, mySourceIndex, isTargetUCharDBCS,myConverterData, err);
                        }
                    }
                }

                concatString(args, &myTargetIndex, &myTargetLength,
                                &targetUniChar,err, &mySourceIndex);
                
                TEST_ERROR_CONDITION(args,myTargetIndex, mySourceIndex, isTargetUCharDBCS,myConverterData, err);

            }/* end of end if(targetUniChar==missingCharMarker)*/
            else{
                
                iterCount = (iterCount<8)? iterCount+1 : 0;
                if(mySourceChar>0x00ff && currentState==7){
                    myConverterData->currentState=currentState=(StateEnum)4;
                }
                else
                    myConverterData->currentState=currentState=(StateEnum)(currentState<7)? currentState+1:0;
                
                if((currentState!= initIterState) ){

                    /* explicitly decrement source since it has already been incremented */
                    mySourceIndex--;
                    targetUniChar =missingCharMarker;
                    isEscapeAppended = FALSE; 
                    /* save the state */
                    myConverterData->isEscapeAppended = isEscapeAppended;
                    myConverterData->isShiftAppended =isShiftAppended;
                    args->converter->fromUnicodeStatus = isTargetUCharDBCS;
                    myConverterData->sourceIndex = mySourceIndex;
                    myConverterData->targetIndex = myTargetIndex;
                    continue;
                }
                else{
                    /* if we cannot find the character after checking all codepages 
                     * then this is an error
                     */
                    reason = UCNV_UNASSIGNED;
                     *err = U_INVALID_CHAR_FOUND;

CALLBACK:
                    saveSource = args->source;
                    saveTarget = args->target;
                    saveOffsets = args->offsets;
                    args->target = (char*)myTarget + myTargetIndex;
                    args->source = mySource + mySourceIndex;
                    myConverterData->isEscapeAppended = isEscapeAppended;
                    myConverterData->isShiftAppended =isShiftAppended;
                    args->converter->fromUnicodeStatus = isTargetUCharDBCS;
                    myConverterData->sourceIndex = mySourceIndex;
                    myConverterData->targetIndex = myTargetIndex;

                    FromU_CALLBACK_MACRO(args->converter->fromUContext,
                                         args,
                                         args->converter->invalidUCharBuffer,
                                         args->converter->invalidUCharLength,
                                         (UChar32) (args->converter->invalidUCharLength == 2 ? 
                                             UTF16_GET_PAIR_VALUE(args->converter->invalidUCharBuffer[0], 
                                                                  args->converter->invalidUCharBuffer[1]) 
                                                    : args->converter->invalidUCharBuffer[0]),
                                         reason,
                                         err);

                    args->source = saveSource;
                    args->target = saveTarget;
                    args->offsets = saveOffsets;
                    if (U_FAILURE (*err)){
                      break;
                    }
                    args->converter->invalidUCharLength = 0;
                }
            }
        } /* end if(myTargetIndex<myTargetLength) */
        else{
            *err =U_BUFFER_OVERFLOW_ERROR;
            break;
        } 

    }/* end while(mySourceIndex<mySourceLength) */
    

    /*save the state and return */
    args->target += myTargetIndex;
    args->source += mySourceIndex;
    myConverterData->sourceIndex = 0;
    myConverterData->targetIndex = 0;
    args->converter->fromUnicodeStatus = isTargetUCharDBCS;

}

static void concatString(UConverterFromUnicodeArgs* args, int32_t *targetIndex, int32_t *targetLength,
                  const UChar32* strToAppend,UErrorCode* err, int32_t *sourceIndex){

    if(*strToAppend < 0x00FF){
        if( (*targetIndex)+1 >= *targetLength){
            args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = (unsigned char) *strToAppend;
            *err = U_BUFFER_OVERFLOW_ERROR;
        }else{
            args->target[*targetIndex] = (unsigned char) *strToAppend;

            if(args->offsets!=NULL){
                args->offsets[*targetIndex] = *sourceIndex-1;
            }
            (*targetIndex)++;
            
        }
    }
    else{
        if(*targetIndex < *targetLength){
            args->target[*targetIndex] =(unsigned char) (*strToAppend>>8);
            if(args->offsets!=NULL){
                args->offsets[*targetIndex] = *sourceIndex-1;
            }
            (*targetIndex)++;

            if(*targetIndex < *targetLength){
                args->target[(*targetIndex)] =(unsigned char) (*strToAppend & 0x00FF);

                if(args->offsets!=NULL){
                    args->offsets[*targetIndex] = *sourceIndex-1;
                }
                (*targetIndex)++;
            }
            else{
                args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = (unsigned char) (*strToAppend & 0x00FF);
                *err = U_BUFFER_OVERFLOW_ERROR;

            }
            
        }
        else{
            args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = (unsigned char) (*strToAppend>>8);
            args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = (unsigned char) (*strToAppend & 0x00FF);
            *err = U_BUFFER_OVERFLOW_ERROR;
            if(args->offsets!=NULL){
                args->offsets[*targetIndex] = *sourceIndex-1;

            }
        }
    }

}


static void concatEscape(UConverterFromUnicodeArgs* args, int32_t *targetIndex, int32_t *targetLength,
                  const char* strToAppend,UErrorCode* err,int len){
    while(len-->0){
        if(*targetIndex < *targetLength){
            args->target[(*targetIndex)++] = (unsigned char) *strToAppend;
        }
        else{
            args->converter->charErrorBuffer[(int)args->converter->charErrorBufferLength++] = (unsigned char) *strToAppend;
            *err =U_BUFFER_OVERFLOW_ERROR;
        }
        strToAppend++;
    }
}
    
static void concatChar(UConverterFromUnicodeArgs* args, int32_t *targetIndex, int32_t *targetLength,
                  int8_t charToAppend,UErrorCode* err){
    if( *targetIndex < *targetLength){
        args->target[(*targetIndex)++] = (unsigned char) charToAppend;
    }else{
        args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = (unsigned char) charToAppend;
        *err = U_BUFFER_OVERFLOW_ERROR;
    }
}

/*************** to unicode *******************/

/*
 * This is a simple, interim implementation of GetNextUChar()
 * that allows to concentrate on testing one single implementation
 * of the ToUnicode conversion before it gets copied to
 * multiple version that are then optimized for their needs
 * (with vs. without offsets and getNextUChar).
 */

U_CFUNC UChar32
UConverter_getNextUChar_ISO_2022_JP(UConverterToUnicodeArgs *pArgs,
                  UErrorCode *pErrorCode) {
    UChar buffer[UTF_MAX_CHAR_LENGTH];
    const char *realLimit=pArgs->sourceLimit;

    pArgs->target=buffer;
    pArgs->targetLimit=buffer+UTF_MAX_CHAR_LENGTH;

    while(pArgs->source<realLimit) {
        /* feed in one byte at a time to make sure to get only one character out */
        pArgs->sourceLimit=pArgs->source+1;
        pArgs->flush= (UBool)(pArgs->sourceLimit==realLimit);
        UConverter_toUnicode_ISO_2022_JP(pArgs, pErrorCode);
        if(U_FAILURE(*pErrorCode) && *pErrorCode!=U_BUFFER_OVERFLOW_ERROR) {
            return 0xffff;
        } else if(pArgs->target!=buffer) {
            if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
                *pErrorCode=U_ZERO_ERROR;
            }
            return ucnv_getUChar32KeepOverflow(pArgs->converter, buffer, pArgs->target-buffer);
        }
    }

    /* no output because of empty input or only state changes and skipping callbacks */
    *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
    return 0xffff;
}
                  
U_CFUNC void UConverter_toUnicode_ISO_2022_JP(UConverterToUnicodeArgs *args,
                                     UErrorCode* err){ 

	const char *mySourceLimit;
	char const* sourceStart;
	UConverter *saveThis;

	/*Arguments Check*/
	if (U_FAILURE(*err)) 
		return;

	if ((args->converter == NULL) || (args->targetLimit < args->target) || (args->sourceLimit < args->source)){
	  *err = U_ILLEGAL_ARGUMENT_ERROR;
	  return;
	}

	do{
		
		/*Find the end of the buffer e.g : Next Escape Seq | end of Buffer*/
		mySourceLimit =  getEndOfBuffer_2022(&(args->source), args->sourceLimit, args->flush); 
		
 		if (args->converter->mode == UCNV_SO) /*Already doing some conversion*/{

			saveThis = args->converter;
			args->offsets = NULL;
			args->converter = ((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter;
			ucnv_toUnicode(args->converter,
				  &args->target,
				  args->targetLimit,
				  &args->source,
				  mySourceLimit,
				  args->offsets,
				  args->flush,
				  err);
			args->converter = saveThis;
		}
		/* in ISO-2022-jp the characters preceeding any escape sequence are assumed
		 * to be ASCII so we need to explicitly check for it
		 */
		if((((UConverterDataISO2022 *)args->converter->extraInfo)->isFirstBuffer) && (args->source[0]!=(char)ESC_2022)
						&&  (((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter==NULL)){

		
				saveThis = args->converter;
				args->offsets = NULL;
				((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter = ucnv_open("ASCII",err);

				if(U_FAILURE(*err)){
					break;
				}

				args->converter = ((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter;
				ucnv_toUnicode(args->converter,
					&args->target,
					args->targetLimit,
					&args->source,
					mySourceLimit,
					args->offsets,
					args->flush,
					err);
				args->converter = saveThis;
				args->converter->mode = UCNV_SO;
				((UConverterDataISO2022*)(args->converter->extraInfo))->isFirstBuffer=FALSE;
			
		}

		/*-Done with buffer with entire buffer
		  -Error while converting
		*/

		if (U_FAILURE(*err) || (args->source == args->sourceLimit)) 
			return;

		sourceStart = args->source;
		changeState_2022(args->converter,
						   &(args->source), 
						   args->sourceLimit,
						   args->flush,
						   err);
		/* args->source = sourceStart; */
			

	}while(args->source < args->sourceLimit);

	((UConverterDataISO2022*)(args->converter->extraInfo))->isFirstBuffer=FALSE;

	return;
}

U_CFUNC void UConverter_toUnicode_ISO_2022_JP_OFFSETS_LOGIC(UConverterToUnicodeArgs *args,
                                     UErrorCode* err){
	int32_t myOffset=0;
	int32_t base = 0;
	const char* mySourceLimit;
	char const* sourceStart;
	UConverter* _this = NULL;

	/*Arguments Check*/
	if (U_FAILURE(*err)) 
		return;
	if ((args->converter == NULL) || (args->targetLimit < args->target) || (args->sourceLimit < args->source)){
		*err = U_ILLEGAL_ARGUMENT_ERROR;
		return;
	}

	do{
		mySourceLimit =  getEndOfBuffer_2022(&(args->source), args->sourceLimit, args->flush); 
		/*Find the end of the buffer e.g : Next Escape Seq | end of Buffer*/

		if (args->converter->mode == UCNV_SO) /*Already doing some conversion*/{
			const UChar* myTargetStart = args->target;

			_this = args->converter;
			args->converter = ((UConverterDataISO2022*)(_this->extraInfo))->currentConverter;
			ucnv_toUnicode(args->converter, 
							&(args->target),
							args->targetLimit,
							&(args->source),
							mySourceLimit,
							args->offsets,
							args->flush,
							err);

			args->converter = _this;
			{
				int32_t lim =  args->target - myTargetStart;
				int32_t i = 0;
				for (i=base; i < lim;i++){   
					args->offsets[i] += myOffset;
				}
				base += lim;
			}
		
		}
		if(((UConverterDataISO2022 *)args->converter->extraInfo)->isFirstBuffer && args->source[0]!=ESC_2022
			&& ((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter==NULL){

			const UChar* myTargetStart = args->target;
			UConverter* saveThis = args->converter;
			args->offsets = NULL;
			((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter = ucnv_open("ASCII",err);

			if(U_FAILURE(*err)){
				break;
			}

			args->converter = ((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter;
			ucnv_toUnicode(args->converter,
				&args->target,
				args->targetLimit,
				&args->source,
				mySourceLimit,
				args->offsets,
				args->flush,
				err);
			args->converter = saveThis;
			args->converter->mode = UCNV_SO;
			((UConverterDataISO2022*)(args->converter->extraInfo))->isFirstBuffer=FALSE;
						args->converter = _this;
			{
				int32_t lim =  args->target - myTargetStart;
				int32_t i = 0;
				for (i=base; i < lim;i++){   
					args->offsets[i] += myOffset;
				}
				base += lim;
			}
		}
		/*-Done with buffer with entire buffer
		-Error while converting
		*/

		if (U_FAILURE(*err) || (args->source == args->sourceLimit)) 
			return;

		sourceStart = args->source;
		changeState_2022(args->converter,
						&(args->source), 
						args->sourceLimit,
						args->flush,
						err);
		myOffset += args->source - sourceStart;

	}while(mySourceLimit != args->sourceLimit);
	
	return;
}



/***************************************************************
 *   Rules for ISO-2022-KR encoding
 *   i) The KSC5601 designator sequence should appear only once in a file, 
 *      at the begining of a line before any KSC5601 characters. This usually
 *      means that it appears by itself on the first line of the file
 *  ii) There are only 2 shifting sequences SO to shift into double byte mode
 *      and SI to shift into single byte mode   
 */
 const char* getEndOfBuffer_2022_KR(UConverterToUnicodeArgs* args, UErrorCode* err);


U_CFUNC void UConverter_fromUnicode_ISO_2022_KR(UConverterFromUnicodeArgs* args, UErrorCode* err){

    const UChar *mySource = args->source;
    unsigned char *myTarget = (unsigned char *) args->target;
    int32_t mySourceIndex = 0;
    int32_t myTargetIndex = 0;
    uint32_t targetValue=0;
    int32_t targetLength = args->targetLimit - args->target;
    int32_t sourceLength = args->sourceLimit - args->source;
    int32_t length=0;
    UChar32 targetUniChar = 0x0000;
    UChar mySourceChar = 0x0000,c=0x0000;
    UBool isTargetUCharDBCS = (UBool)args->converter->fromUnicodeStatus;
    UBool oldIsTargetUCharDBCS = isTargetUCharDBCS;
    UConverterDataISO2022 *myConverterData=(UConverterDataISO2022*)args->converter->extraInfo;
    UConverterCallbackReason reason;

    isTargetUCharDBCS   = (UBool) args->converter->fromUnicodeStatus;
    
    /*writing the char to the output stream */
    while (mySourceIndex < sourceLength){

        

        if (myTargetIndex < targetLength){
        
            c=mySourceChar = (UChar) args->source[mySourceIndex++];

            /*Handle surrogates */
            if(UTF_IS_LEAD(mySourceChar)){
                    
                args->converter->invalidUCharBuffer[0] = (UChar)mySource[mySourceIndex - 1];
                args->converter->invalidUCharLength = 1;

                /*mySourceIndex has already been incremented*/
                if(mySourceIndex < sourceLength){
                    if(UTF_IS_TRAIL(mySource[mySourceIndex])){
                          args->converter->invalidUCharBuffer[1] = (UChar)mySource[mySourceIndex];
                          args->converter->invalidUCharLength++;
                          mySourceIndex++;
                          continue;
                    }
                    else if (args->flush == TRUE){
                        reason = UCNV_ILLEGAL;
                        *err = U_TRUNCATED_CHAR_FOUND;
                        goto CALLBACK;
                    } 
                    else{
                        reason=UCNV_ILLEGAL;
                        goto CALLBACK;
                    }
                }
                else{
                    args->converter->invalidUCharBuffer[1] = (UChar)mySource[mySourceIndex];
                    continue;
                }
            }
            else if(UTF_IS_TRAIL(mySourceChar)){
                if(args->converter->fromUSurrogateLead == 0){
                    reason = UCNV_ILLEGAL;
                    goto CALLBACK;
                }
                else{
                    /* the only way we can arrive here is if UTF lead surrogate was found
                     * at the end of previous buffer. So we need to check if the current
                     * current source index is 0 or not 
                     */
                    if(mySourceIndex-1 ==0){
                          args->converter->invalidUCharBuffer[1] = (UChar)mySource[mySourceIndex];
                          args->converter->invalidUCharLength++;
                          mySourceIndex++;
                          continue;
                    }
                    else{
                        reason=UCNV_ILLEGAL;
                        goto CALLBACK;
                    }
                }
            }

            length= _MBCSFromUChar32(myConverterData->fromUnicodeConverter->sharedData,
                                     mySourceChar,&targetValue,args->converter->useFallback);
            targetUniChar = (UChar32) targetValue;

            /* only DBCS or SBCS characters are expected*/
            if(length > 2 || length==0){
                reason =UCNV_ILLEGAL;
                *err =U_INVALID_CHAR_FOUND;
                goto CALLBACK;
            }

            oldIsTargetUCharDBCS = isTargetUCharDBCS;
            isTargetUCharDBCS = (UBool)(targetUniChar>0x00FF);

            if (targetUniChar != missingCharMarker){

              if (oldIsTargetUCharDBCS != isTargetUCharDBCS){

                  if (isTargetUCharDBCS) 
                      args->target[myTargetIndex++] = UCNV_SO;
                  else 
                      args->target[myTargetIndex++] = UCNV_SI;


                  if ((!isTargetUCharDBCS)&&(myTargetIndex+1 >= targetLength)){
                      args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = (char) targetUniChar;
                      *err = U_BUFFER_OVERFLOW_ERROR;
                      break;
                  }
                  else if (myTargetIndex+1 >= targetLength){

                      args->converter->charErrorBuffer[0] = (char) (targetUniChar >> 8);
                      args->converter->charErrorBuffer[1] = (char)(targetUniChar & 0x00FF);
                      args->converter->charErrorBufferLength = 2;
                      *err = U_BUFFER_OVERFLOW_ERROR;
                      break;
                  }

              }

              if (!isTargetUCharDBCS){

                  args->target[myTargetIndex++] = (char) targetUniChar;
              }
              else{
                  args->target[myTargetIndex++] = (char) (targetUniChar >> 8);
                  if (myTargetIndex < targetLength){
                      args->target[myTargetIndex++] = (char) targetUniChar;
                  }
                  else{
                      args->converter->charErrorBuffer[0] = (char) targetUniChar;
                      args->converter->charErrorBufferLength = 1;
                      *err = U_BUFFER_OVERFLOW_ERROR;
                      break;
                  }
              }
            }
            else{

CALLBACK:
                {
                  const UChar* saveSource = args->source;
                  char* saveTarget = args->target;
                  int32_t *saveOffsets = args->offsets;

                  isTargetUCharDBCS = oldIsTargetUCharDBCS;
                  *err = U_INVALID_CHAR_FOUND;
                  args->converter->invalidUCharBuffer[0] = (UChar) mySourceChar;
                  args->converter->invalidUCharLength = 1;

                  args->converter->fromUnicodeStatus = (int32_t)isTargetUCharDBCS;
                  args->target += myTargetIndex;
                  args->source += mySourceIndex;
                  FromU_CALLBACK_MACRO(args->converter->fromUContext,
                                     args,
                                     args->converter->invalidUCharBuffer,
                                     1,
                                     (UChar32) mySourceChar,
                                     UCNV_UNASSIGNED,
                                     err);
                  args->source = saveSource;
                  args->target = saveTarget;
                  args->offsets = saveOffsets;
                  isTargetUCharDBCS  = (UBool) args->converter->fromUnicodeStatus;
                  if (U_FAILURE (*err)) break;
                  args->converter->invalidUCharLength = 0;
                }
            }
        }
        else{
            *err = U_BUFFER_OVERFLOW_ERROR;
            break;
        }

    }

    args->target += myTargetIndex;
    args->source += mySourceIndex;
    args->converter->fromUnicodeStatus = (int32_t)isTargetUCharDBCS;

    return;
}


U_CFUNC void UConverter_fromUnicode_ISO_2022_KR_OFFSETS_LOGIC(UConverterFromUnicodeArgs* args, UErrorCode* err){

    const UChar *mySource = args->source;
    unsigned char *myTarget = (unsigned char *) args->target;
    int32_t mySourceIndex = 0;
    int32_t myTargetIndex = 0;
    int32_t targetLength = args->targetLimit - args->target;
    int32_t sourceLength = args->sourceLimit - args->source;
    UChar32 targetUniChar = 0x0000;
    UChar mySourceChar = 0x0000;
    uint32_t targetValue=0;
    UBool isTargetUCharDBCS = (UBool)args->converter->fromUnicodeStatus;
    UBool oldIsTargetUCharDBCS = isTargetUCharDBCS;
    UConverterDataISO2022 *myConverterData=(UConverterDataISO2022*)args->converter->extraInfo;
    UConverterCallbackReason reason;
    int32_t length =0;

    isTargetUCharDBCS   = (UBool) args->converter->fromUnicodeStatus;
    
    /*writing the char to the output stream */
    while (mySourceIndex < sourceLength){

        

        if (myTargetIndex < targetLength){
        
            mySourceChar = (UChar) args->source[mySourceIndex++];

            /*Handle surrogates */
            if(UTF_IS_LEAD(mySourceChar)){
                    
                args->converter->invalidUCharBuffer[0] = (UChar)mySource[mySourceIndex - 1];
                args->converter->invalidUCharLength = 1;

                /*mySourceIndex has already been incremented*/
                if(mySourceIndex < sourceLength){
                    if(UTF_IS_TRAIL(mySource[mySourceIndex])){
                          args->converter->invalidUCharBuffer[1] = (UChar)mySource[mySourceIndex];
                          args->converter->invalidUCharLength++;
                          mySourceIndex++;
                          continue;
                    }
                    else if (args->flush == TRUE){
                        reason = UCNV_ILLEGAL;
                        *err = U_TRUNCATED_CHAR_FOUND;
                        goto CALLBACK;
                    } 
                    else{
                        reason=UCNV_ILLEGAL;
                        goto CALLBACK;
                    }
                }
                else{
                    args->converter->invalidUCharBuffer[1] = (UChar)mySource[mySourceIndex];
                    continue;
                }
            }
            else if(UTF_IS_TRAIL(mySourceChar)){
                if(args->converter->fromUSurrogateLead == 0){
                    reason = UCNV_ILLEGAL;
                    goto CALLBACK;
                }
                else{
                    /* the only way we can arrive here is if UTF lead surrogate was found
                     * at the end of previous buffer. So we need to check if the current
                     * current source index is 0 or not 
                     */
                    if(mySourceIndex-1 ==0){
                          args->converter->invalidUCharBuffer[1] = (UChar)mySource[mySourceIndex];
                          args->converter->invalidUCharLength++;
                          mySourceIndex++;
                          continue;
                    }
                    else{
                        reason=UCNV_ILLEGAL;
                        goto CALLBACK;
                    }
                }
            }
        
            
            length= _MBCSFromUChar32(myConverterData->fromUnicodeConverter->sharedData,
                                     mySourceChar,&targetValue,args->converter->useFallback);
            targetUniChar = (UChar32) targetValue;

            /* only DBCS or SBCS characters are expected*/
            if(length > 2 || length==0){
                reason =UCNV_ILLEGAL;
                *err =U_INVALID_CHAR_FOUND;
                goto CALLBACK;
            }
      
            oldIsTargetUCharDBCS = isTargetUCharDBCS;
            isTargetUCharDBCS = (UBool)(targetUniChar>0x00FF);
            if (targetUniChar != missingCharMarker){

                if (oldIsTargetUCharDBCS != isTargetUCharDBCS){

                    args->offsets[myTargetIndex] = mySourceIndex-1;
                    if (isTargetUCharDBCS) args->target[myTargetIndex++] = UCNV_SO;
                    else args->target[myTargetIndex++] = UCNV_SI;
                  
                  
                    if ((!isTargetUCharDBCS)&&(myTargetIndex+1 >= targetLength)){

                        args->converter->charErrorBuffer[0] = (char) targetUniChar;
                        args->converter->charErrorBufferLength = 1;
                        *err = U_BUFFER_OVERFLOW_ERROR;
                        break;
                    }
                    else if (myTargetIndex+1 >= targetLength){

                        args->converter->charErrorBuffer[0] = (char) (targetUniChar >> 8);
                        args->converter->charErrorBuffer[1] = (char) (targetUniChar & 0x00FF);
                        args->converter->charErrorBufferLength = 2;
                        *err = U_BUFFER_OVERFLOW_ERROR;
                        break;
                    }
                }
              
                if (!isTargetUCharDBCS){

                    args->offsets[myTargetIndex] = mySourceIndex-1;
                    args->target[myTargetIndex++] = (char) targetUniChar;
                }
                else{
                    args->offsets[myTargetIndex] = mySourceIndex-1;
                    args->target[myTargetIndex++] = (char) (targetUniChar >> 8);
                    
                    if (myTargetIndex < targetLength){
                        args->offsets[myTargetIndex] = mySourceIndex-1;
                        args->target[myTargetIndex++] = (char) targetUniChar;
                    }
                    else{
                        args->converter->charErrorBuffer[0] = (char) targetUniChar;
                        args->converter->charErrorBufferLength = 1;
                        *err = U_BUFFER_OVERFLOW_ERROR;
                        break;
                    }
                }
            }
            else{
CALLBACK:       
                {
                    int32_t currentOffset = args->offsets[myTargetIndex-1]+1;
                    char * saveTarget = args->target;
                    const UChar* saveSource = args->source;
                    int32_t *saveOffsets = args->offsets;
                    *err = U_INVALID_CHAR_FOUND;
                    args->converter->invalidUCharBuffer[0] = (UChar) mySourceChar;
                    args->converter->invalidUCharLength = 1;

                    /* Breaks out of the loop since behaviour was set to stop */
                    args->converter->fromUnicodeStatus = (int32_t)isTargetUCharDBCS;
                    args->target += myTargetIndex;
                    args->source += mySourceIndex;
                    args->offsets = args->offsets?args->offsets+myTargetIndex:0;
                    FromU_CALLBACK_OFFSETS_LOGIC_MACRO(args->converter->fromUContext,
                                         args,
                                         args->converter->invalidUCharBuffer,
                                         1,
                                         (UChar32)mySourceChar,
                                         UCNV_UNASSIGNED,
                                         err);
                    isTargetUCharDBCS  = (UBool)(args->converter->fromUnicodeStatus);
                    args->source = saveSource;
                    args->target = saveTarget;
                    args->offsets = saveOffsets;
                    isTargetUCharDBCS  = (UBool)(args->converter->fromUnicodeStatus);
                    if (U_FAILURE (*err))     
                        break;
                    args->converter->invalidUCharLength = 0;
                }
            }
        }
        else{
        
            *err = U_BUFFER_OVERFLOW_ERROR;
            break;
        }

    }


    args->target += myTargetIndex;
    args->source += mySourceIndex;
  

}
const char* getEndOfBuffer_2022_KR(UConverterToUnicodeArgs* args, UErrorCode* err){

    const char* mySource = args->source;

    if (args->source >= args->sourceLimit) 
        return args->sourceLimit;

    do{

        switch(*mySource){

            case ESC_2022:
                {
                    /* Already doing some conversion and found escape Sequence*/
                    if(args->converter->mode == UCNV_SO){
                        *err = U_ILLEGAL_ESCAPE_SEQUENCE;
                        return mySource;
                    }
                    else{
                        changeState_2022(args->converter,
                           &(args->source), 
                           args->sourceLimit,
                           args->flush,
                           err);
                    }
                    if(U_FAILURE(*err))
                        return mySource;
                    else
                        mySource = args->source;
                        mySource--;
                    break;
                }
            case UCNV_SI:
                if(mySource == args->source){
                    args->source++;
                    return getEndOfBuffer_2022_KR(args,err);
                }
                else{
                    return mySource;
                }
                break;

            case UCNV_SO:
                if(mySource == args->source){
                    args->source++;
                    return getEndOfBuffer_2022_KR(args,err);
                }
                else{
                    return mySource;
                }
                break;
            default:
                break;
        }
    
    }while (mySource++ < args->sourceLimit);

    return args->sourceLimit;
}


U_CFUNC void UConverter_toUnicode_ISO_2022_KR(UConverterToUnicodeArgs* args, UErrorCode* err){
    
    const char *mySourceLimit;
    UConverter *saveThis;

    /*Arguments Check*/
    if (U_FAILURE(*err)) 
        return;

    if ((args->converter == NULL) || (args->targetLimit < args->target) || (args->sourceLimit < args->source)){
      *err = U_ILLEGAL_ARGUMENT_ERROR;
      return;
    }

    do{
        
        /*Find the end of the buffer e.g : shift in sequence || escape sequence || end of Buffer*/
        mySourceLimit =  getEndOfBuffer_2022_KR(args,err);
        
        if (U_FAILURE(*err) || (args->source == args->sourceLimit)) 
            return;

        saveThis = args->converter;
        args->converter = ((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter;
        ucnv_toUnicode(args->converter,
              &args->target,
              args->targetLimit,
              &args->source,
              mySourceLimit,
              args->offsets,
              args->flush,
              err);
        args->converter = saveThis;
    
        if (U_FAILURE(*err) || (args->source == args->sourceLimit)) 
            return;
        
        /* args->source = sourceStart; */
    }while(args->source < args->sourceLimit);
    
    return;
}


U_CFUNC void UConverter_toUnicode_ISO_2022_KR_OFFSETS_LOGIC(UConverterToUnicodeArgs* args, UErrorCode* err){
    
    int32_t myOffset=0;
    int32_t base = 0;
    const char *mySourceLimit;
    UConverter *saveThis;

    /*Arguments Check*/
    if (U_FAILURE(*err)) 
        return;

    if ((args->converter == NULL) || (args->targetLimit < args->target) || (args->sourceLimit < args->source)){
      *err = U_ILLEGAL_ARGUMENT_ERROR;
      return;
    }

    do{
        const UChar* myTargetStart = args->target;
        /*Find the end of the buffer e.g : shift in sequence || escape sequence || end of Buffer*/
        mySourceLimit =  getEndOfBuffer_2022_KR(args,err);
        
        if (U_FAILURE(*err) || (args->source == args->sourceLimit)) 
            return;

        saveThis = args->converter;
        args->converter = ((UConverterDataISO2022*)(args->converter->extraInfo))->currentConverter;
        ucnv_toUnicode(args->converter,
              &args->target,
              args->targetLimit,
              &args->source,
              mySourceLimit,
              args->offsets,
              args->flush,
              err);
        args->converter = saveThis;
        			
		{
			int32_t lim =  args->target - myTargetStart;
			int32_t i = 0;
			for (i=base; i < lim;i++){   
				args->offsets[i] += myOffset;
			}
			base += lim;
		}
    
        if (U_FAILURE(*err) || (args->source == args->sourceLimit)) 
            return;
        
        /* args->source = sourceStart; */
    }while(args->source < args->sourceLimit);
    
    return;
}
/*
 * This is a simple, interim implementation of GetNextUChar()
 * that allows to concentrate on testing one single implementation
 * of the ToUnicode conversion before it gets copied to
 * multiple version that are then optimized for their needs
 * (with vs. without offsets and getNextUChar).
 */

U_CFUNC UChar32
UConverter_getNextUChar_ISO_2022_KR(UConverterToUnicodeArgs *pArgs,
                  UErrorCode *pErrorCode) {
    UChar buffer[UTF_MAX_CHAR_LENGTH];
    const char *realLimit=pArgs->sourceLimit;

    pArgs->target=buffer;
    pArgs->targetLimit=buffer+UTF_MAX_CHAR_LENGTH;

    while(pArgs->source<realLimit) {
        /* feed in one byte at a time to make sure to get only one character out */
        pArgs->sourceLimit=pArgs->source+1;
        pArgs->flush= (UBool)(pArgs->sourceLimit==realLimit);
        UConverter_toUnicode_ISO_2022_KR(pArgs, pErrorCode);
        if(U_FAILURE(*pErrorCode) && *pErrorCode!=U_BUFFER_OVERFLOW_ERROR) {
            return 0xffff;
        } else if(pArgs->target!=buffer) {
            if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
                *pErrorCode=U_ZERO_ERROR;
            }
            return ucnv_getUChar32KeepOverflow(pArgs->converter, buffer, pArgs->target-buffer);
        }
    }

    /* no output because of empty input or only state changes and skipping callbacks */
    *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
    return 0xffff;
}

/*************************** END ISO2022-KR *********************************/



/*************************** ISO-2022-CN *********************************
 * 
 * Rules for ISO-2022-CN Encoding:
 * i)   The desinator sequence must appear once on a line before any instance
 *      of character set it designates.
 * ii)  If two lines contain characters from the same character set, both lines
 *      must include the designator sequence.
 * iii) Once the designator sequence is know, a shifting sequnce has to found
 *      to invoke the  shifting
 * iv)  All lines start in ASCII and end in ASCII.  
 * v)   Four shifting sequences are employed for this purpose:
 *
 *      Sequcence   ASCII Eq    Charsets
 *      ----------  -------    ---------     
 *      SS2         <ESC>N      CNS-11643-1992 Planes 3-7
 *      SS3         <ESC>O      CNS-11643-1992 Plane 2
 *      SI          <SI>        
 *      SO          <SO>        CNS-11643-1992 Plane 1, GB2312,ISO-IR-165
 *
 * vi)   
 *      SOdesignator  : ESC "$" ")" finalchar_for_SO
 *      SS2designator : ESC "$" "*" finalchar_for_SS2
 *      SS3designator : ESC "$" "+" finalchar_for_SS3
 *
 *      ESC $ ) A       Indicates the bytes following SO are Chinese
 *                      characters as defined in GB 2312-80, until
 *                      another SOdesignation appears
 *                      
 *
 *      ESC $ ) E       Indicates the bytes following SO are as defined
 *                      in ISO-IR-165 (for details, see section 2.1),
 *                      until another SOdesignation appears
 *
 *      ESC $ ) G       Indicates the bytes following SO are as defined
 *                      in CNS 11643-plane-1, until another
 *                      SOdesignation appears
 *
 *      ESC $ * H       Indicates the two bytes immediately following
 *                      SS2 is a Chinese character as defined in CNS
 *                      11643-plane-2, until another SS2designation
 *                      appears
 *                      (Meaning <ESC>N must preceed every 2 byte 
 *                       sequence.)   
 *
 *      ESC $ + I       Indicates the immediate two bytes following SS3
 *                      is a Chinese character as defined in CNS
 *                      11643-plane-3, until another SS3designation
 *                      appears
 *                      (Meaning <ESC>O must preceed every 2 byte 
 *                       sequence.)   
 *
 *      ESC $ + J       Indicates the immediate two bytes following SS3
 *                      is a Chinese character as defined in CNS
 *                      11643-plane-4, until another SS3designation
 *                      appears
 *                      (In English: <ESC>N must preceed every 2 byte 
 *                       sequence.)   
 *
 *      ESC $ + K       Indicates the immediate two bytes following SS3
 *                      is a Chinese character as defined in CNS
 *                      11643-plane-5, until another SS3designation
 *                      appears
 *
 *      ESC $ + L       Indicates the immediate two bytes following SS3
 *                      is a Chinese character as defined in CNS
 *                      11643-plane-6, until another SS3designation
 *                      appears
 *
 *      ESC $ + M       Indicates the immediate two bytes following SS3
 *                      is a Chinese character as defined in CNS
 *                      11643-plane-7, until another SS3designation
 *                      appears
 *
 *       As in ISO-2022-CN, each line starts in ASCII, and ends in ASCII, and
 *       has its own designation information before any Chinese characters
 *       appear
 *
 */

 
 /********************** ISO2022-CN Data **************************/
static const char* escSeqCharsCN[10] ={
    "\x1B\x28\x42",     /* ASCII */
    "\x1B\x24\x29\x41", /* GB 2312-80 */
    "\x1B\x24\x29\x45", /* ISO-IR-165 */
    "\x1B\x24\x29\x47", /* CNS 11643-1992 Plane 1 */
    "\x1B\x24\x2A\x48", /* CNS 11643-1992 Plane 2 */
    "\x1B\x24\x2B\x49", /* CNS 11643-1992 Plane 3 */
    "\x1B\x24\x2B\x4A", /* CNS 11643-1992 Plane 4 */
    "\x1B\x24\x2B\x4B", /* CNS 11643-1992 Plane 5 */
    "\x1B\x24\x2B\x4C", /* CNS 11643-1992 Plane 6 */
    "\x1B\x24\x2B\x4D"  /* CNS 11643-1992 Plane 7 */
};
 
static const char* shiftSeqCharsCN[10] ={
    "",
    (const char*) "\x0E",
    (const char*) "\x0E",
    (const char*) "\x0E",
    (const char*) UCNV_SS2,
    (const char*) UCNV_SS3,
    (const char*) UCNV_SS3,
    (const char*) UCNV_SS3,
    (const char*) UCNV_SS3,
    (const char*) UCNV_SS3
};

typedef enum  {
    ASCII_1=0,
    GB2312_1=1,
    ISO_IR_165=2,
    CNS_11643=3,
} StateEnumCN;

static Cnv2022Type myConverterTypeCN[4]={
   SBCS,
   DBCS,
   DBCS,
   MBCS
};

U_CFUNC void UConverter_fromUnicode_ISO_2022_CN(UConverterFromUnicodeArgs* args, UErrorCode* err){
    
    UChar* mySource =(UChar*)args->source;
    UConverterDataISO2022 *myConverterData=(UConverterDataISO2022*)args->converter->extraInfo;
    UConverterCallbackReason reason;
    UBool isEscapeAppended = FALSE;
    StateEnumCN initIterState;
    unsigned char *myTarget = (unsigned char *) args->target; 
    const UChar *saveSource;
    uint32_t targetValue=0;
    char *saveTarget;
    int32_t *saveOffsets ;
    int32_t myTargetLength = args->targetLimit - args->target;
    int32_t mySourceLength = args->sourceLimit - args->source;
    int32_t mySourceIndex = 0;
    int32_t myTargetIndex = 0;
    int32_t length  =0;
    int plane = 0;
    CompactShortArray *myFromUnicodeDBCS = NULL;
    CompactShortArray *myFromUnicodeDBCSFallback = NULL;
    CompactByteArray  *myFromUnicodeSBCS = NULL;
    CompactByteArray  *myFromUnicodeSBCSFallback = NULL;
    UChar32 targetUniChar = missingCharMarker;
    
    StateEnumCN currentState=ASCII;

    UChar mySourceChar = 0x0000;
    int iterCount = 0;
    const char *escSeq = NULL;
    UBool isShiftAppended = FALSE;
    mySourceIndex = myConverterData->sourceIndex;
    myTargetIndex = myConverterData->targetIndex;
    isEscapeAppended =(UBool) myConverterData->isEscapeAppended;
    isShiftAppended =(UBool) myConverterData->isShiftAppended;
    initIterState =ASCII;
    /* arguments check*/
    if ((args->converter == NULL) || (args->targetLimit < args->target) || (args->sourceLimit < args->source)){
      *err = U_ILLEGAL_ARGUMENT_ERROR;
      return;
    }

    while(mySourceIndex <  mySourceLength){
        currentState =(StateEnumCN) myConverterData->currentState;
        myConverterData->fromUnicodeConverter = (myConverterData->fromUnicodeConverter == NULL) ?
                                            myConverterData->myConverterArray[0] :
                                            myConverterData->myConverterArray[(int)myConverterData->currentState];
     
        if(myTargetIndex < myTargetLength){

            mySourceChar = (UChar) args->source[mySourceIndex++];

            /* I am handling surrogates in the begining itself so that I donot have to go through 8 
             * iterations on codepages that we support. 
             */
            if(UTF_IS_LEAD(mySourceChar)){
                    
                args->converter->invalidUCharBuffer[0] = (UChar)mySource[mySourceIndex - 1];
                args->converter->invalidUCharLength = 1;

                /*mySourceIndex has already been incremented*/
                if(mySourceIndex < mySourceLength){
                    if(UTF_IS_TRAIL(mySource[mySourceIndex])){
                          args->converter->invalidUCharBuffer[1] = (UChar)mySource[mySourceIndex];
                          args->converter->invalidUCharLength++;
                          mySourceIndex++;
                          continue;
                    }
                    else if (args->flush == TRUE){
                        reason = UCNV_ILLEGAL;
                        *err = U_TRUNCATED_CHAR_FOUND;
                        goto CALLBACK;
                    } 
                    else{
                        reason=UCNV_ILLEGAL;
                        goto CALLBACK;
                    }
                }
                else{
                    args->converter->invalidUCharBuffer[1] = (UChar)mySource[mySourceIndex];
                    continue;
                }
            }
            else if(UTF_IS_TRAIL(mySourceChar)){
                if(args->converter->fromUSurrogateLead == 0){
                    reason = UCNV_ILLEGAL;
                    goto CALLBACK;
                }
                else{
                    /* the only way we can arrive here is if UTF lead surrogate was found
                     * at the end of previous buffer. So we need to check if the current
                     * current source index is 0 or not 
                     */
                    if(mySourceIndex-1 ==0){
                          args->converter->invalidUCharBuffer[1] = (UChar)mySource[mySourceIndex];
                          args->converter->invalidUCharLength++;
                          mySourceIndex++;
                          continue;
                    }
                    else{
                        reason=UCNV_ILLEGAL;
                        goto CALLBACK;
                    }
                }
            }
            /* if the source character is CR or LF then append the ASCII escape sequence*/
            else if(mySourceChar== 0x000A || mySourceChar== 0x000D){

                if((int)currentState > 0 && isShiftAppended){
                    concatChar(args, &myTargetIndex, &myTargetLength, UCNV_SI,err);
                    isShiftAppended=myConverterData->isShiftAppended=FALSE;
                   /* TODO:Test the error condition */
                }
                myConverterData->isEscapeAppended=isEscapeAppended=FALSE;
                targetUniChar = mySourceChar;
                concatString(args, &myTargetIndex, &myTargetLength,&targetUniChar,err,&mySourceIndex);
               /* TEST_ERROR_CONDITION(args,myTargetIndex, mySourceIndex, isTargetUCharDBCS,myConverterData, err);*/
                
                continue;
            }
            else{
            
                switch (myConverterTypeCN[currentState]){

                    case SBCS:
                        myFromUnicodeSBCS = &myConverterData->fromUnicodeConverter->sharedData->table->sbcs.fromUnicode;
                        myFromUnicodeSBCSFallback = &myConverterData->fromUnicodeConverter->sharedData->table->sbcs.fromUnicodeFallback;

                        targetUniChar = (UChar32) ucmp8_getu (myFromUnicodeSBCS, mySourceChar);

                        if ((targetUniChar==0)&&(myConverterData->fromUnicodeConverter->useFallback == TRUE) &&
                            (myConverterData->fromUnicodeConverter->sharedData->staticData->hasFromUnicodeFallback == TRUE)){
                             targetUniChar = (UChar32) ucmp8_getu (myFromUnicodeSBCSFallback, mySourceChar);
                        }
                        /* ucmp8_getU returns 0 for missing char so explicitly set it missingCharMarker*/
                        targetUniChar=(UChar)((targetUniChar==0) ? (UChar) missingCharMarker : targetUniChar);
                        break;
                        
                    case DBCS:
                        
                        myFromUnicodeDBCS = &myConverterData->fromUnicodeConverter->sharedData->table->dbcs.fromUnicode;
                        myFromUnicodeDBCSFallback = &myConverterData->fromUnicodeConverter->sharedData->table->dbcs.fromUnicodeFallback;
                        targetUniChar = (UChar) ucmp16_getu (myFromUnicodeDBCS, mySourceChar);
                        
                        if ((targetUniChar==missingCharMarker)&&(myConverterData->fromUnicodeConverter->useFallback == TRUE) &&
                                (myConverterData->fromUnicodeConverter->sharedData->staticData->hasFromUnicodeFallback == TRUE)){
                             targetUniChar = (UChar) ucmp16_getu (myFromUnicodeDBCSFallback, mySourceChar);
                        }
                        break;

                    case MBCS:
                       
                       length= _MBCSFromUChar32(myConverterData->fromUnicodeConverter->sharedData,
                                     mySourceChar,&targetValue,args->converter->useFallback);

                       targetUniChar = (UChar32) targetValue;
            
                       if(length==0){
                            targetUniChar = missingCharMarker;
                       } 
                       else if(length==3){
                            uint8_t planeVal = (uint8_t) ((targetValue)>>16);
                            if(planeVal >0x80 && planeVal<0x89){
                                plane = (int)(planeVal - 0x80);
                                targetUniChar -= (planeVal<<16);
                            }else 
                                plane =-1;
                       }
                       else if(length >3){
                            reason =UCNV_ILLEGAL;
                            *err =U_INVALID_CHAR_FOUND;
                            goto CALLBACK;
                        }
                        break;

                    case LATIN1:
             
                    default:
                        /*not expected */ 
                        break;
                }
            }

            if(targetUniChar!= missingCharMarker){
                
                /* set the iteration state and iteration count  */          
                initIterState = currentState;
                iterCount =0;
                if(myConverterData->plane != plane){
                    isEscapeAppended=myConverterData->isEscapeAppended=FALSE;
                    myConverterData->plane = plane;
                }
                /* Append the escpace sequence */
                if(!isEscapeAppended){
                    escSeq = (currentState==CNS_11643) ? escSeqCharsCN[(int)currentState+plane-1]:escSeqCharsCN[(int)currentState];
                    concatEscape(args, &myTargetIndex, &myTargetLength, 
                                       escSeq,err,strlen(escSeq));
                    isEscapeAppended=myConverterData->isEscapeAppended=TRUE;

                    TEST_ERROR_CONDITION_CN(args,myTargetIndex, mySourceIndex,myConverterData, err);
     
                }
                /* Append Shift Sequences */
                if(currentState!=ASCII){
                    
                    if(currentState!=CNS_11643 ){
                        if(!isShiftAppended){
                                concatEscape(args,&myTargetIndex,&myTargetLength,
                                             shiftSeqCharsCN[currentState],err,
                                             strlen(shiftSeqCharsCN[currentState]));
                                myConverterData->isShiftAppended =isShiftAppended=TRUE;
                        }
                        TEST_ERROR_CONDITION_CN(args,myTargetIndex, mySourceIndex,myConverterData, err);
                    }
                    else{
                        concatEscape(args,&myTargetIndex,&myTargetLength,shiftSeqCharsCN[currentState+plane],
                            err,strlen(shiftSeqCharsCN[currentState+plane]));

                        myConverterData->isShiftAppended =isShiftAppended=FALSE;
                        TEST_ERROR_CONDITION_CN(args,myTargetIndex, mySourceIndex,myConverterData, err);
                    }

                }

                concatString(args, &myTargetIndex, &myTargetLength,
                                &targetUniChar,err, &mySourceIndex);
                TEST_ERROR_CONDITION_CN(args,myTargetIndex, mySourceIndex,myConverterData, err);

            }/* end of end if(targetUniChar==missingCharMarker)*/
            else{
                

                iterCount = (iterCount<3)? iterCount+1 : 0;
                myConverterData->currentState=currentState=(StateEnum)(currentState<3)? currentState+1:0;
                
                if((currentState!= initIterState) ){

                    /* explicitly decrement source since it has already been incremented */
                    mySourceIndex--;
                    targetUniChar =missingCharMarker;
                    isEscapeAppended = FALSE; 
                    /* save the state */
                    myConverterData->isEscapeAppended = isEscapeAppended;
                    myConverterData->isShiftAppended =isShiftAppended;
                    
                    myConverterData->sourceIndex = mySourceIndex;
                    myConverterData->targetIndex = myTargetIndex;
                    continue;
                }
                else{
                    /* if we cannot find the character after checking all codepages 
                     * then this is an error
                     */
                    reason = UCNV_UNASSIGNED;
                     *err = U_INVALID_CHAR_FOUND;

CALLBACK:
                    saveSource = args->source;
                    saveTarget = args->target;
                    saveOffsets = args->offsets;
                    args->target = (char*)myTarget + myTargetIndex;
                    args->source = mySource + mySourceIndex;
                    myConverterData->isEscapeAppended = isEscapeAppended;
                    myConverterData->isShiftAppended =isShiftAppended;
                   
                    myConverterData->sourceIndex = mySourceIndex;
                    myConverterData->targetIndex = myTargetIndex;

                    FromU_CALLBACK_MACRO(args->converter->fromUContext,
                                         args,
                                         args->converter->invalidUCharBuffer,
                                         args->converter->invalidUCharLength,
                                         (UChar32) (args->converter->invalidUCharLength == 2 ? 
                                             UTF16_GET_PAIR_VALUE(args->converter->invalidUCharBuffer[0], 
                                                                  args->converter->invalidUCharBuffer[1]) 
                                                    : args->converter->invalidUCharBuffer[0]),
                                         reason,
                                         err);

                    args->source = saveSource;
                    args->target = saveTarget;
                    args->offsets = saveOffsets;
                    if (U_FAILURE (*err)){
                      break;
                    }
                    args->converter->invalidUCharLength = 0;
                }
            }
            
        } /* end if(myTargetIndex<myTargetLength) */
        else{
            *err =U_BUFFER_OVERFLOW_ERROR;
            break;
        } 

    }/* end while(mySourceIndex<mySourceLength) */
    

    /*save the state and return */
    args->target += myTargetIndex;
    args->source += mySourceIndex;
    myConverterData->sourceIndex = 0;
    myConverterData->targetIndex = 0;
}

/*************** to unicode *******************/

static void changeState_2022_CN(UConverter* _this,
                      const char** source, 
                      const char* sourceLimit,
                      UBool flush,int* plane,
                      UErrorCode* err){
    UConverter* myUConverter;
    uint32_t key = _this->toUnicodeStatus;
    UCNV_TableStates_2022 value;
    UConverterDataISO2022* myData2022 = ((UConverterDataISO2022*)_this->extraInfo);
    const char* chosenConverterName = NULL;
    const char* sourceStart =*source;
    char c;
    char cnvName[20];
    int32_t offset;

    /*In case we were in the process of consuming an escape sequence
    we need to reprocess it */

    do{

        /* Needed explicit cast for key on MVS to make compiler happy - JJD */
        if(**source == UCNV_SI ){
            if(sourceStart == *source){
                 (*source)++;
                 value=(UCNV_TableStates_2022) 1;
                 offset = 6;
                 goto DONE;
            }
        }
        if(**source ==UCNV_SO){
            if(sourceStart == *source){
                 (*source)++;
                 return;
            }
        }
        value = getKey_2022(**source,(int32_t *) &key, &offset);
        switch (value){
            case VALID_NON_TERMINAL_2022 : 
                break;
  
            case VALID_TERMINAL_2022:
                {
                    (*source)++;
                    chosenConverterName = escSeqStateTable_Result_2022[offset];
                    key = 0;
                    goto DONE;
                };
                break;
  
            case INVALID_2022:
                {
                    _this->toUnicodeStatus = 0;
                    *err = U_ILLEGAL_ESCAPE_SEQUENCE;
                    return;
                }
            case VALID_SS2_SEQUENCE:
                {
                    (*source)++;
                    key = 0;
                    goto DONE;
                }
  
            case VALID_MAYBE_TERMINAL_2022:
                {
                    const char* mySource = (*source+1);
                    int32_t myKey = key;
                    UCNV_TableStates_2022 myValue = value;
                    int32_t myOffset=0;
                    if(*mySource==ESC_2022){
                        while ((mySource < sourceLimit) && 
                               ((myValue == VALID_MAYBE_TERMINAL_2022)||(myValue == VALID_NON_TERMINAL_2022))){
                            myValue = getKey_2022(*(mySource++), &myKey, &myOffset);
                        }
                    }
                    else{
                        (*source)++;
                        myValue=(UCNV_TableStates_2022) 1;
                        myOffset = 7;
                    }

                    switch (myValue){
                        case INVALID_2022:
                            {
                                /*Backs off*/
                                chosenConverterName = escSeqStateTable_Result_2022[offset];
                                value = VALID_TERMINAL_2022;
                                goto DONE;
                            };
                            break;
      
                        case VALID_TERMINAL_2022:
                            {
                                 /*uses longer escape sequence*/
                                chosenConverterName = escSeqStateTable_Result_2022[myOffset];
                                key = 0;
                                value = VALID_TERMINAL_2022;
                                goto DONE;
                            };
                            break;

                        /* Not expected. Added to make the gcc happy */
                        case VALID_SS2_SEQUENCE:
                            {
                                (*source)++;
                                key = 0;
                                goto DONE;
                            }
  
                        case VALID_NON_TERMINAL_2022: 

                        case VALID_MAYBE_TERMINAL_2022:
                            {
                                if (flush){
                                    /*Backs off*/
                                    chosenConverterName = escSeqStateTable_Result_2022[offset];
                                    value = VALID_TERMINAL_2022;
                                    key = 0;
                                    goto DONE;
                                }
                                else{
                                    key = myKey;
                                    value = VALID_NON_TERMINAL_2022;
                                }
                            };
                            break;
                    };
                    break;
                };
                break;
        }
    }while (++(*source) < sourceLimit);

    DONE:
    _this->toUnicodeStatus = key;
    if(chosenConverterName){
        if(uprv_strstr(chosenConverterName,"CNS")!=NULL){
            int i=0;
            while((c=*chosenConverterName)!=0 && c!=UCNV_OPTION_SEP_CHAR ) {

                    cnvName[i++]=c;
                    ++chosenConverterName;
            }
            cnvName[i]=0;
            if(c==UCNV_OPTION_SEP_CHAR){
                chosenConverterName++;
                *plane = atoi(chosenConverterName);
            }
            
        }
        else{
            uprv_strcpy(cnvName,chosenConverterName);
            *plane=0;
        }
    }
    if ((value == VALID_NON_TERMINAL_2022) || (value == VALID_MAYBE_TERMINAL_2022)) {
      return;
    }
    if (value > 0 ) {
        if(value==3 || value==4 ){
            _this->mode = UCNV_SI;
            myData2022->shiftValid2Bytes=TRUE;
            myUConverter =myData2022->currentConverter;
        }
        else{
            _this->mode = UCNV_SI;
            ucnv_close(myData2022->currentConverter);
            myData2022->currentConverter = myUConverter = ucnv_open(cnvName, err);

        }
        if (U_SUCCESS(*err)){
            /*Customize the converter with the attributes set on the 2022 converter*/
            myUConverter->fromUCharErrorBehaviour = _this->fromUCharErrorBehaviour;
            myUConverter->fromUContext = _this->fromUContext;
            myUConverter->fromCharErrorBehaviour = _this->fromCharErrorBehaviour;
            myUConverter->toUContext = _this->toUContext;

            uprv_memcpy(myUConverter->subChar, 
                       _this->subChar,
                       myUConverter->subCharLen = _this->subCharLen);

            _this->mode = UCNV_SO;
        }
    }

    return;
}  

U_CFUNC void UConverter_toUnicode_ISO_2022_CN(UConverterToUnicodeArgs *args,
                                     UErrorCode* err){
    char tempBuf[3];
    int plane=0;
    char* pBuf;
    const char *mySource = ( char *) args->source;
    UChar *myTarget = args->target;
    char *tempLimit = &tempBuf[2]+1; 
    int32_t mySourceIndex = 0;
    int32_t myTargetIndex = 0;
    const char *mySourceLimit = args->sourceLimit;
    UChar32 targetUniChar = 0x0000;
    UChar mySourceChar = 0x0000;
    UConverterDataISO2022* myData=(UConverterDataISO2022*)(args->converter->extraInfo);
    CompactShortArray *myToUnicodeDBCS=NULL, *myToUnicodeFallbackDBCS = NULL; 
   

    /*Arguments Check*/
    if (U_FAILURE(*err)) 
        return;

    if ((args->converter == NULL) || (args->targetLimit < args->target) || (args->sourceLimit < args->source)){
      *err = U_ILLEGAL_ARGUMENT_ERROR;
      return;
    }
 
    while(mySource< args->sourceLimit){

        if(myTarget < args->targetLimit){
            
            mySourceChar= (unsigned char) *mySource++;


            switch(mySourceChar){
                case 0x0A:
                     if(args->converter->toUnicodeStatus != 0x00){
                        goto SAVE_STATE;
                    }
                    myData->currentState = SBCS;
                    myData->plane=plane = 0;
                    break;

                 case 0x0D:
                     if(args->converter->toUnicodeStatus != 0x00){
                        goto SAVE_STATE;
                    }
                    myData->currentState = SBCS;
                    myData->plane=plane = 0;
                    break;

                case UCNV_SI:
                    if(args->converter->toUnicodeStatus != 0x00){
                        goto SAVE_STATE;
                    }
                    myData->currentState = SBCS;
                    myData->plane=plane = 0;
                    continue;

                case UCNV_SO:
                    if(args->converter->toUnicodeStatus != 0x00){
                        goto SAVE_STATE;
                    }
                    
                    myData->currentState = (plane>0) ? MBCS: DBCS;
                    myData->shiftValid2Bytes =FALSE;
                    continue;

                case ESC_2022:
                    if(args->converter->toUnicodeStatus != 0x00){
                        goto SAVE_STATE;
                    }
                    mySource--;
                    changeState_2022_CN(args->converter,&(mySource), 
                                        args->sourceLimit, args->flush,&plane,err);
                    
                    myData->plane=plane;
                    if(plane>0){
                        myData->currentState = MBCS;
                    }
                    else if(uprv_stricmp("latin_1",myData->currentConverter->sharedData->staticData->name)==0){
                        myData->currentState=SBCS;
                    }
                    
                    if(*mySource ==ESC_2022 || *mySource == UCNV_SO)
                        continue;
                    else
                        mySourceChar = *mySource++;
                    break;
      
                default:
                    if(args->converter->mode==UCNV_SI)/*already doing some conversion*/{

                        /* if there are no escape sequences in the first buffer then they
                         * are assumed to be ASCII according to RFC-1922
                         */
                        
                        myData->currentState = SBCS;
                        myData->plane=plane = 0;
                    }
                    break;
            }

            switch(myData->currentState){

                case SBCS:
                    
                    if(args->converter->fromUnicodeStatus == 0x00){
                        targetUniChar = (UChar)  mySourceChar;
                    }
                    else{
                        goto SAVE_STATE;
                    }
                    break;
                    
                case DBCS:
                    myToUnicodeDBCS = &myData->currentConverter->sharedData->table->dbcs.toUnicode;
                    myToUnicodeFallbackDBCS = &myData->currentConverter->sharedData->table->dbcs.toUnicodeFallback;

                    if(args->converter->toUnicodeStatus == 0x00){
                        args->converter->toUnicodeStatus = (UChar) mySourceChar;
                        continue;
                    }
                    else{
                       tempBuf[0] = (char) args->converter->toUnicodeStatus ;
                       tempBuf[1] = (char) mySourceChar;
                       mySourceChar= (UChar)((args->converter->toUnicodeStatus << 8) | (mySourceChar & 0x00ff));
                       args->converter->toUnicodeStatus =0x00;
                       
                        targetUniChar = ucmp16_getu(myToUnicodeDBCS,mySourceChar);
                        if(targetUniChar> 0xfffe){
                            if((args->converter->useFallback == TRUE) && 
                                (myData->currentConverter->sharedData->staticData->hasFromUnicodeFallback == TRUE)){
                             
                                targetUniChar = (UChar) ucmp16_getu(myToUnicodeFallbackDBCS, mySourceChar);
                            }
                        }
                    }

                    break;

                case MBCS:
                    
                    if(args->converter->toUnicodeStatus == 0x00){
                        args->converter->toUnicodeStatus = (UChar) mySourceChar;
                        continue;
                    }
                    else{
                      tempBuf[0] = (char)( 0x80+plane);
                      tempBuf[1] = (char) (args->converter->toUnicodeStatus);
                      tempBuf[2] = (char) (mySourceChar);
                      args->converter->toUnicodeStatus = 0;
                      myData->shiftValid2Bytes =FALSE;
                      pBuf = &tempBuf[0];
                      tempLimit = &tempBuf[2]+1;
                      targetUniChar = _MBCSSimpleGetNextUChar(myData->currentConverter->sharedData,
                                                                &pBuf,tempLimit,args->converter->useFallback);
                    }
                    break;

                case LATIN1:
                    break;
            }
            if(myData->shiftValid2Bytes && args->converter->toUnicodeStatus==0x00){
                myData->currentState = SBCS;
            }
            if(targetUniChar < 0xfffe){
                *(myTarget++)=(UChar)targetUniChar;
            }
            else if(targetUniChar>=0xfffe){
SAVE_STATE:
                {
                    const char *saveSource = args->source;
                    UChar *saveTarget = args->target;
                    int32_t *saveOffsets = args->offsets;
                    UConverterCallbackReason reason;

                    if(targetUniChar == 0xfffe){
                        reason = UCNV_UNASSIGNED;
                        *err = U_INVALID_CHAR_FOUND;
                    }
                    else{
                        reason = UCNV_ILLEGAL;
                        *err = U_ILLEGAL_CHAR_FOUND;
                    }
                    args->converter->invalidCharBuffer[args->converter->invalidCharLength++] = tempBuf[0];
                    args->converter->invalidCharBuffer[args->converter->invalidCharLength++] = tempBuf[1];
                    args->converter->invalidCharBuffer[args->converter->invalidCharLength++] = tempBuf[2];
                    args->target = myTarget;
                    args->source = mySource;
                    ToU_CALLBACK_MACRO( args->converter->toUContext,
                                        args,
                                        args->converter->invalidCharBuffer,
                                        args->converter->invalidCharLength,
                                        reason,
                                        err);
                    args->source  = saveSource;
                    args->target  = saveTarget;
                    args->offsets = saveOffsets;
                    if(U_FAILURE(*err))
                        break;
                    args->converter->invalidCharLength=0;
                }
            }
        }
        else{
            *err =U_BUFFER_OVERFLOW_ERROR;
            break;
        }
    }
    if((args->flush==TRUE)
        && (mySource == mySourceLimit) 
        && ( args->converter->toUnicodeStatus !=0x00)){
        if(U_SUCCESS(*err)){
            *err = U_TRUNCATED_CHAR_FOUND;
            args->converter->toUnicodeStatus = 0x00;
        }
    }
    args->target = myTarget;
    args->source = mySource;
}

U_CFUNC void UConverter_toUnicode_ISO_2022_CN_OFFSETS_LOGIC(UConverterToUnicodeArgs *args,
                                     UErrorCode* err){
    char tempBuf[3];
    int plane=0;
    char* pBuf;
    const char *mySource = ( char *) args->source;
    UChar *myTarget = args->target;
    char *tempLimit = &tempBuf[3]; 
    int32_t mySourceIndex = 0;
    int32_t myTargetIndex = 0;
    const char *mySourceLimit = args->sourceLimit;
    UChar32 targetUniChar = 0x0000;
    UChar mySourceChar = 0x0000;
    UConverterDataISO2022* myData=(UConverterDataISO2022*)(args->converter->extraInfo);
    CompactShortArray *myToUnicodeDBCS=NULL, *myToUnicodeFallbackDBCS = NULL; 
   
    /*Arguments Check*/
    if (U_FAILURE(*err)) 
        return;

    if ((args->converter == NULL) || (args->targetLimit < args->target) || (args->sourceLimit < args->source)){
      *err = U_ILLEGAL_ARGUMENT_ERROR;
      return;
    }
 
    while(mySource< args->sourceLimit){

        if(myTarget < args->targetLimit){
            
            mySourceChar= (unsigned char) *mySource++;


            switch(mySourceChar){
                case 0x0A:
                     if(args->converter->toUnicodeStatus != 0x00){
                        goto SAVE_STATE;
                    }
                    myData->currentState = SBCS;
                    myData->plane=plane = 0;
                    break;

                 case 0x0D:
                     if(args->converter->toUnicodeStatus != 0x00){
                        goto SAVE_STATE;
                    }
                    myData->currentState = SBCS;
                    myData->plane=plane = 0;
                    break;

                case UCNV_SI:
                    if(args->converter->toUnicodeStatus != 0x00){
                        goto SAVE_STATE;
                    }
                    myData->currentState = SBCS;
                    myData->plane=plane = 0;
                    continue;

                case UCNV_SO:
                    if(args->converter->toUnicodeStatus != 0x00){
                        goto SAVE_STATE;
                    }
                    
                    myData->currentState = (plane>0) ? MBCS: DBCS;
                    myData->shiftValid2Bytes =FALSE;
                    continue;

                case ESC_2022:
                    if(args->converter->toUnicodeStatus != 0x00){
                        goto SAVE_STATE;
                    }
                    mySource--;
                    changeState_2022_CN(args->converter,&(mySource), 
                                        args->sourceLimit, args->flush,&plane,err);
                    
                    myData->plane=plane;
                    if(plane>0){
                        myData->currentState = MBCS;
                    }
                    else if(uprv_stricmp("latin_1",myData->currentConverter->sharedData->staticData->name)==0){
                        myData->currentState=SBCS;
                    }
                    
                    if(*mySource ==ESC_2022 || *mySource == UCNV_SO)
                        continue;
                    else
                        mySourceChar = *mySource++;
                    break;
      
                default:
                    if(args->converter->mode==UCNV_SI)/*already doing some conversion*/{

                        /* if there are no escape sequences in the first buffer then they
                         * are assumed to be ASCII according to RFC-1922
                         */
                        
                        myData->currentState = SBCS;
                        myData->plane=plane = 0;
                    }
                    break;
            }

            switch(myData->currentState){

                case SBCS:
                    
                    if(args->converter->fromUnicodeStatus == 0x00){
                        targetUniChar = (UChar)  mySourceChar;
                    }
                    else{
                        goto SAVE_STATE;
                    }
                    break;
                    
                case DBCS:
                    myToUnicodeDBCS = &myData->currentConverter->sharedData->table->dbcs.toUnicode;
                    myToUnicodeFallbackDBCS = &myData->currentConverter->sharedData->table->dbcs.toUnicodeFallback;

                    if(args->converter->toUnicodeStatus == 0x00){
                        args->converter->toUnicodeStatus = (UChar) mySourceChar;
                        continue;
                    }
                    else{
                       tempBuf[0] = (char) args->converter->toUnicodeStatus ;
                       tempBuf[1] = (char) mySourceChar;
                       mySourceChar= (UChar)((args->converter->toUnicodeStatus << 8) | (mySourceChar & 0x00ff));
                       args->converter->toUnicodeStatus =0x00;
                       
                        targetUniChar = ucmp16_getu(myToUnicodeDBCS,mySourceChar);
                        if(targetUniChar> 0xfffe){
                            if((args->converter->useFallback == TRUE) && 
                                (myData->currentConverter->sharedData->staticData->hasFromUnicodeFallback == TRUE)){
                             
                                targetUniChar = (UChar) ucmp16_getu(myToUnicodeFallbackDBCS, mySourceChar);
                            }
                        }
                    }

                    break;

                case MBCS:
                    
                    if(args->converter->toUnicodeStatus == 0x00){
                        args->converter->toUnicodeStatus = (UChar) mySourceChar;
                        continue;
                    }
                    else{
                      tempBuf[0] = (char) (0x80+plane);
                      tempBuf[1] = (char) (args->converter->toUnicodeStatus);
                      tempBuf[2] = (char) (mySourceChar);
                      args->converter->toUnicodeStatus = 0x00;
                      myData->shiftValid2Bytes =FALSE;
                      pBuf = &tempBuf[0];
                      tempLimit = &tempBuf[2]+1;
                      targetUniChar = _MBCSSimpleGetNextUChar(myData->currentConverter->sharedData,
                                                                &pBuf,tempLimit,args->converter->useFallback);
                    }
                    break;

                case LATIN1:
                    break;
            }
            if(myData->shiftValid2Bytes && args->converter->toUnicodeStatus==0x00){
                myData->currentState = SBCS;
            }
            if(targetUniChar < 0xfffe){
                if(myData->currentState == SBCS){
                    args->offsets[myTarget - args->target]= mySource - args->source - 1;
                }
                else{
                    args->offsets[myTarget - args->target]= mySource - args->source - 2;
                }
                *(myTarget++)=(UChar)targetUniChar;
            }
            else if(targetUniChar>=0xfffe){
SAVE_STATE:
                {
                    const char *saveSource = args->source;
                    UChar *saveTarget = args->target;
                    int32_t *saveOffsets = args->offsets;
                    UConverterCallbackReason reason;

                    if(targetUniChar == 0xfffe){
                        reason = UCNV_UNASSIGNED;
                        *err = U_INVALID_CHAR_FOUND;
                    }
                    else{
                        reason = UCNV_ILLEGAL;
                        *err = U_ILLEGAL_CHAR_FOUND;
                    }
                    args->converter->invalidCharBuffer[args->converter->invalidCharLength++] = tempBuf[0];
                    args->converter->invalidCharBuffer[args->converter->invalidCharLength++] = tempBuf[1];
                    args->converter->invalidCharBuffer[args->converter->invalidCharLength++] = tempBuf[2];
                    args->target = myTarget;
                    args->source = mySource;
                    ToU_CALLBACK_MACRO( args->converter->toUContext,
                                        args,
                                        args->converter->invalidCharBuffer,
                                        args->converter->invalidCharLength,
                                        reason,
                                        err);
                    args->source  = saveSource;
                    args->target  = saveTarget;
                    args->offsets = saveOffsets;
                    if(U_FAILURE(*err))
                        break;
                    args->converter->invalidCharLength=0;
                }
            }
        }
        else{
            *err =U_BUFFER_OVERFLOW_ERROR;
            break;
        }
    }
    if((args->flush==TRUE)
        && (mySource == mySourceLimit) 
        && ( args->converter->toUnicodeStatus !=0x00)){
        if(U_SUCCESS(*err)){
            *err = U_TRUNCATED_CHAR_FOUND;
            args->converter->toUnicodeStatus = 0x00;
        }
    }
    args->target = myTarget;
    args->source = mySource;
}

/*
 * This is a simple, interim implementation of GetNextUChar()
 * that allows to concentrate on testing one single implementation
 * of the ToUnicode conversion before it gets copied to
 * multiple version that are then optimized for their needs
 * (with vs. without offsets and getNextUChar).
 */

U_CFUNC UChar32
UConverter_getNextUChar_ISO_2022_CN(UConverterToUnicodeArgs *pArgs,
                  UErrorCode *pErrorCode) {
    UChar buffer[UTF_MAX_CHAR_LENGTH];
    const char *realLimit=pArgs->sourceLimit;

    pArgs->target=buffer;
    pArgs->targetLimit=buffer+UTF_MAX_CHAR_LENGTH;

    while(pArgs->source<realLimit) {
        /* feed in one byte at a time to make sure to get only one character out */
        pArgs->sourceLimit=pArgs->source+1;
        pArgs->flush= (UBool)(pArgs->sourceLimit==realLimit);
        UConverter_toUnicode_ISO_2022_CN(pArgs, pErrorCode);
        if(U_FAILURE(*pErrorCode) && *pErrorCode!=U_BUFFER_OVERFLOW_ERROR) {
            return 0xffff;
        } else if(pArgs->target!=buffer) {
            if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
                *pErrorCode=U_ZERO_ERROR;
            }
            return ucnv_getUChar32KeepOverflow(pArgs->converter, buffer, pArgs->target-buffer);
        }
    }

    /* no output because of empty input or only state changes and skipping callbacks */
    *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
    return 0xffff;
}