581 lines
22 KiB
C
581 lines
22 KiB
C
/*
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**********************************************************************
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* Copyright (C) 2000-2004, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* file name: ucnvhz.c
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2000oct16
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* created by: Ram Viswanadha
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* 10/31/2000 Ram Implemented offsets logic function
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*
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_CONVERSION && !UCONFIG_NO_LEGACY_CONVERSION
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#include "cmemory.h"
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#include "unicode/ucnv.h"
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#include "unicode/ucnv_cb.h"
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#include "unicode/uset.h"
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#include "ucnv_bld.h"
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#include "ucnv_cnv.h"
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#define UCNV_TILDE 0x7E /* ~ */
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#define UCNV_OPEN_BRACE 0x7B /* { */
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#define UCNV_CLOSE_BRACE 0x7D /* } */
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#define SB_ESCAPE "\x7E\x7D"
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#define DB_ESCAPE "\x7E\x7B"
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#define TILDE_ESCAPE "\x7E\x7E"
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#define ESC_LEN 2
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#define CONCAT_ESCAPE_MACRO( args, targetIndex,targetLength,strToAppend, err, len,sourceIndex){ \
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while(len-->0){ \
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if(targetIndex < targetLength){ \
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args->target[targetIndex] = (unsigned char) *strToAppend; \
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if(args->offsets!=NULL){ \
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*(offsets++) = sourceIndex-1; \
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} \
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targetIndex++; \
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} \
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else{ \
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args->converter->charErrorBuffer[(int)args->converter->charErrorBufferLength++] = (unsigned char) *strToAppend; \
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*err =U_BUFFER_OVERFLOW_ERROR; \
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} \
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strToAppend++; \
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} \
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}
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typedef struct{
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int32_t targetIndex;
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int32_t sourceIndex;
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UBool isEscapeAppended;
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UConverter* gbConverter;
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UBool isStateDBCS;
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UBool isTargetUCharDBCS;
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}UConverterDataHZ;
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static void
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_HZOpen(UConverter *cnv, const char *name,const char *locale,uint32_t options, UErrorCode *errorCode){
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cnv->toUnicodeStatus = 0;
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cnv->fromUnicodeStatus= 0;
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cnv->mode=0;
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cnv->fromUChar32=0x0000;
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cnv->extraInfo = uprv_malloc (sizeof (UConverterDataHZ));
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if(cnv->extraInfo != NULL){
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((UConverterDataHZ*)cnv->extraInfo)->gbConverter = ucnv_open("ibm-1386",errorCode);
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((UConverterDataHZ*)cnv->extraInfo)->isStateDBCS = FALSE;
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((UConverterDataHZ*)cnv->extraInfo)->isEscapeAppended = FALSE;
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((UConverterDataHZ*)cnv->extraInfo)->targetIndex = 0;
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((UConverterDataHZ*)cnv->extraInfo)->sourceIndex = 0;
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((UConverterDataHZ*)cnv->extraInfo)->isTargetUCharDBCS = FALSE;
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}
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/* test for NULL */
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else {
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*errorCode = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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}
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static void
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_HZClose(UConverter *cnv){
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if(cnv->extraInfo != NULL) {
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ucnv_close (((UConverterDataHZ *) (cnv->extraInfo))->gbConverter);
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if(!cnv->isExtraLocal) {
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uprv_free(cnv->extraInfo);
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}
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cnv->extraInfo = NULL;
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}
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}
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static void
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_HZReset(UConverter *cnv, UConverterResetChoice choice){
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if(choice<=UCNV_RESET_TO_UNICODE) {
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cnv->toUnicodeStatus = 0;
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cnv->mode=0;
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if(cnv->extraInfo != NULL){
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((UConverterDataHZ*)cnv->extraInfo)->isStateDBCS = FALSE;
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}
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}
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if(choice!=UCNV_RESET_TO_UNICODE) {
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cnv->fromUnicodeStatus= 0;
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cnv->fromUChar32=0x0000;
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if(cnv->extraInfo != NULL){
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((UConverterDataHZ*)cnv->extraInfo)->isEscapeAppended = FALSE;
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((UConverterDataHZ*)cnv->extraInfo)->targetIndex = 0;
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((UConverterDataHZ*)cnv->extraInfo)->sourceIndex = 0;
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((UConverterDataHZ*)cnv->extraInfo)->isTargetUCharDBCS = FALSE;
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}
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}
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}
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/**************************************HZ Encoding*************************************************
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* Rules for HZ encoding
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*
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* In ASCII mode, a byte is interpreted as an ASCII character, unless a
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* '~' is encountered. The character '~' is an escape character. By
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* convention, it must be immediately followed ONLY by '~', '{' or '\n'
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* (<LF>), with the following special meaning.
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* 1. The escape sequence '~~' is interpreted as a '~'.
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* 2. The escape-to-GB sequence '~{' switches the mode from ASCII to GB.
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* 3. The escape sequence '~\n' is a line-continuation marker to be
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* consumed with no output produced.
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* In GB mode, characters are interpreted two bytes at a time as (pure)
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* GB codes until the escape-from-GB code '~}' is read. This code
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* switches the mode from GB back to ASCII. (Note that the escape-
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* from-GB code '~}' ($7E7D) is outside the defined GB range.)
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*
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* Source: RFC 1842
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*/
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static void
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UConverter_toUnicode_HZ_OFFSETS_LOGIC(UConverterToUnicodeArgs *args,
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UErrorCode* err){
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char tempBuf[2];
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const char *mySource = ( char *) args->source;
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UChar *myTarget = args->target;
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const char *mySourceLimit = args->sourceLimit;
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UChar32 targetUniChar = 0x0000;
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UChar mySourceChar = 0x0000;
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UConverterDataHZ* myData=(UConverterDataHZ*)(args->converter->extraInfo);
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if ((args->converter == NULL) || (args->targetLimit < args->target) || (mySourceLimit < args->source)){
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*err = U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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while(mySource< mySourceLimit){
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if(myTarget < args->targetLimit){
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mySourceChar= (unsigned char) *mySource++;
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switch(mySourceChar){
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case 0x0A:
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if(args->converter->mode ==UCNV_TILDE){
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args->converter->mode=0;
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}
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*(myTarget++)=(UChar)mySourceChar;
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continue;
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case UCNV_TILDE:
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if(args->converter->mode ==UCNV_TILDE){
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*(myTarget++)=(UChar)mySourceChar;
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args->converter->mode=0;
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continue;
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}
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else if(args->converter->toUnicodeStatus !=0){
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args->converter->mode=0;
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break;
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}
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else{
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args->converter->mode = UCNV_TILDE;
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continue;
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}
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case UCNV_OPEN_BRACE:
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if(args->converter->mode == UCNV_TILDE){
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args->converter->mode=0;
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myData->isStateDBCS = TRUE;
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continue;
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}
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else{
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break;
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}
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case UCNV_CLOSE_BRACE:
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if(args->converter->mode == UCNV_TILDE){
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args->converter->mode=0;
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myData->isStateDBCS = FALSE;
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continue;
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}
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else{
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break;
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}
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default:
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/* if the first byte is equal to TILDE and the trail byte
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* is not a valid byte then it is an error condition
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*/
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if(args->converter->mode == UCNV_TILDE){
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args->converter->mode=0;
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mySourceChar= (UChar)(((UCNV_TILDE+0x80) << 8) | ((mySourceChar & 0x00ff)+0x80));
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goto SAVE_STATE;
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}
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break;
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}
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if(myData->isStateDBCS){
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if(args->converter->toUnicodeStatus == 0x00){
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args->converter->toUnicodeStatus = (UChar) mySourceChar;
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continue;
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}
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else{
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tempBuf[0] = (char) (args->converter->toUnicodeStatus+0x80) ;
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tempBuf[1] = (char) (mySourceChar+0x80);
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mySourceChar= (UChar)(((args->converter->toUnicodeStatus+0x80) << 8) | ((mySourceChar & 0x00ff)+0x80));
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args->converter->toUnicodeStatus =0x00;
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targetUniChar = ucnv_MBCSSimpleGetNextUChar(myData->gbConverter->sharedData,
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tempBuf, 2, args->converter->useFallback);
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}
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}
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else{
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if(args->converter->fromUnicodeStatus == 0x00){
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targetUniChar = ucnv_MBCSSimpleGetNextUChar(myData->gbConverter->sharedData,
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mySource - 1, 1, args->converter->useFallback);
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}
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else{
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goto SAVE_STATE;
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}
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}
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if(targetUniChar < 0xfffe){
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if(args->offsets) {
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args->offsets[myTarget - args->target]=(int32_t)(mySource - args->source - 1-(myData->isStateDBCS));
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}
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*(myTarget++)=(UChar)targetUniChar;
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}
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else if(targetUniChar>=0xfffe){
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SAVE_STATE:
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if(targetUniChar == 0xfffe){
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*err = U_INVALID_CHAR_FOUND;
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}
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else{
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*err = U_ILLEGAL_CHAR_FOUND;
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}
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if(myData->isStateDBCS){
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args->converter->toUBytes[0] = (uint8_t)(tempBuf[0]-0x80);
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args->converter->toUBytes[1] = (uint8_t)(tempBuf[1]-0x80);
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args->converter->toULength=2;
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}
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else{
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args->converter->toUBytes[0] = (uint8_t)mySourceChar;
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args->converter->toULength=1;
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}
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break;
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}
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}
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else{
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*err =U_BUFFER_OVERFLOW_ERROR;
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break;
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}
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}
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args->target = myTarget;
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args->source = mySource;
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}
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static void
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UConverter_fromUnicode_HZ_OFFSETS_LOGIC (UConverterFromUnicodeArgs * args,
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UErrorCode * err){
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const UChar *mySource = args->source;
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char *myTarget = args->target;
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int32_t* offsets = args->offsets;
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int32_t mySourceIndex = 0;
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int32_t myTargetIndex = 0;
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int32_t targetLength = (int32_t)(args->targetLimit - myTarget);
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int32_t mySourceLength = (int32_t)(args->sourceLimit - args->source);
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int32_t length=0;
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uint32_t targetUniChar = 0x0000;
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UChar32 mySourceChar = 0x0000,c=0x0000;
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UConverterDataHZ *myConverterData=(UConverterDataHZ*)args->converter->extraInfo;
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UBool isTargetUCharDBCS = (UBool) myConverterData->isTargetUCharDBCS;
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UBool oldIsTargetUCharDBCS = isTargetUCharDBCS;
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UBool isEscapeAppended =FALSE;
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int len =0;
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const char* escSeq=NULL;
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if ((args->converter == NULL) || (args->targetLimit < myTarget) || (args->sourceLimit < args->source)){
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*err = U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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if(args->converter->fromUChar32!=0 && myTargetIndex < targetLength) {
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goto getTrail;
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}
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/*writing the char to the output stream */
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while (mySourceIndex < mySourceLength){
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targetUniChar = missingCharMarker;
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if (myTargetIndex < targetLength){
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c=mySourceChar = (UChar) mySource[mySourceIndex++];
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oldIsTargetUCharDBCS = isTargetUCharDBCS;
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if(mySourceChar ==UCNV_TILDE){
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/*concatEscape(args, &myTargetIndex, &targetLength,"\x7E\x7E",err,2,&mySourceIndex);*/
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len = ESC_LEN;
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escSeq = TILDE_ESCAPE;
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CONCAT_ESCAPE_MACRO(args, myTargetIndex, targetLength, escSeq,err,len,mySourceIndex);
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continue;
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}
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else{
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length= ucnv_MBCSFromUChar32(myConverterData->gbConverter->sharedData,
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mySourceChar,&targetUniChar,args->converter->useFallback);
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}
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/* only DBCS or SBCS characters are expected*/
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/* DB haracters with high bit set to 1 are expected */
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if(length > 2 || length==0 ||(((targetUniChar & 0x8080) != 0x8080)&& length==2)){
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targetUniChar= missingCharMarker;
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}
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if (targetUniChar != missingCharMarker){
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myConverterData->isTargetUCharDBCS = isTargetUCharDBCS = (UBool)(targetUniChar>0x00FF);
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if(oldIsTargetUCharDBCS != isTargetUCharDBCS || !myConverterData->isEscapeAppended ){
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/*Shifting from a double byte to single byte mode*/
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if(!isTargetUCharDBCS){
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len =ESC_LEN;
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escSeq = SB_ESCAPE;
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CONCAT_ESCAPE_MACRO(args, myTargetIndex, targetLength, escSeq,err,len,mySourceIndex);
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myConverterData->isEscapeAppended =isEscapeAppended =TRUE;
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}
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else{ /* Shifting from a single byte to double byte mode*/
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len =ESC_LEN;
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escSeq = DB_ESCAPE;
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CONCAT_ESCAPE_MACRO(args, myTargetIndex, targetLength, escSeq,err,len,mySourceIndex);
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myConverterData->isEscapeAppended =isEscapeAppended =TRUE;
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}
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}
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if(isTargetUCharDBCS){
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if( myTargetIndex <targetLength){
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myTarget[myTargetIndex++] =(char) ((targetUniChar >> 8) -0x80);
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if(offsets){
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*(offsets++) = mySourceIndex-1;
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}
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if(myTargetIndex < targetLength){
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myTarget[myTargetIndex++] =(char) ((targetUniChar & 0x00FF) -0x80);
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if(offsets){
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*(offsets++) = mySourceIndex-1;
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}
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}else{
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args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = (char) ((targetUniChar & 0x00FF) -0x80);
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*err = U_BUFFER_OVERFLOW_ERROR;
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}
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}else{
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args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] =(char) ((targetUniChar >> 8) -0x80);
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args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = (char) ((targetUniChar & 0x00FF) -0x80);
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*err = U_BUFFER_OVERFLOW_ERROR;
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}
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}else{
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if( myTargetIndex <targetLength){
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myTarget[myTargetIndex++] = (char) (targetUniChar );
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if(offsets){
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*(offsets++) = mySourceIndex-1;
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}
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}else{
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args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = (char) targetUniChar;
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*err = U_BUFFER_OVERFLOW_ERROR;
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}
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}
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}
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else{
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/* oops.. the code point is unassigned */
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/*Handle surrogates */
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/*check if the char is a First surrogate*/
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if(UTF_IS_SURROGATE(mySourceChar)) {
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if(UTF_IS_SURROGATE_FIRST(mySourceChar)) {
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args->converter->fromUChar32=mySourceChar;
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getTrail:
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/*look ahead to find the trail surrogate*/
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if(mySourceIndex < mySourceLength) {
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/* test the following code unit */
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UChar trail=(UChar) args->source[mySourceIndex];
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if(UTF_IS_SECOND_SURROGATE(trail)) {
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++mySourceIndex;
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mySourceChar=UTF16_GET_PAIR_VALUE(args->converter->fromUChar32, trail);
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args->converter->fromUChar32=0x00;
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/* there are no surrogates in GB2312*/
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*err = U_INVALID_CHAR_FOUND;
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/* exit this condition tree */
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} else {
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/* this is an unmatched lead code unit (1st surrogate) */
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/* callback(illegal) */
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*err=U_ILLEGAL_CHAR_FOUND;
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}
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} else {
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/* no more input */
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*err = U_ZERO_ERROR;
|
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}
|
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} else {
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/* this is an unmatched trail code unit (2nd surrogate) */
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/* callback(illegal) */
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*err=U_ILLEGAL_CHAR_FOUND;
|
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}
|
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} else {
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/* callback(unassigned) for a BMP code point */
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*err = U_INVALID_CHAR_FOUND;
|
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}
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args->converter->fromUChar32=mySourceChar;
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break;
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}
|
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}
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else{
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*err = U_BUFFER_OVERFLOW_ERROR;
|
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break;
|
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}
|
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targetUniChar=missingCharMarker;
|
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}
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|
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args->target += myTargetIndex;
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args->source += mySourceIndex;
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myConverterData->isTargetUCharDBCS = isTargetUCharDBCS;
|
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}
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|
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static void
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_HZ_WriteSub(UConverterFromUnicodeArgs *args, int32_t offsetIndex, UErrorCode *err) {
|
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UConverter *cnv = args->converter;
|
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UConverterDataHZ *convData=(UConverterDataHZ *) cnv->extraInfo;
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char *p;
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char buffer[4];
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p = buffer;
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|
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if( convData->isTargetUCharDBCS){
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*p++= UCNV_TILDE;
|
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*p++= UCNV_CLOSE_BRACE;
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convData->isTargetUCharDBCS=FALSE;
|
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}
|
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*p++= cnv->subChar[0];
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|
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ucnv_cbFromUWriteBytes(args,
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buffer, (int32_t)(p - buffer),
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offsetIndex, err);
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}
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|
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/* structure for SafeClone calculations */
|
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struct cloneHZStruct
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{
|
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UConverter cnv;
|
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UAlignedMemory deadSpace1;
|
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UConverter subCnv;
|
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UAlignedMemory deadSpace2;
|
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UConverterDataHZ mydata;
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};
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|
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|
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static UConverter *
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_HZ_SafeClone(const UConverter *cnv,
|
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void *stackBuffer,
|
|
int32_t *pBufferSize,
|
|
UErrorCode *status)
|
|
{
|
|
struct cloneHZStruct * localClone;
|
|
int32_t size, bufferSizeNeeded = sizeof(struct cloneHZStruct);
|
|
|
|
if (U_FAILURE(*status)){
|
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return 0;
|
|
}
|
|
|
|
if (*pBufferSize == 0){ /* 'preflighting' request - set needed size into *pBufferSize */
|
|
*pBufferSize = bufferSizeNeeded;
|
|
return 0;
|
|
}
|
|
|
|
localClone = (struct cloneHZStruct *)stackBuffer;
|
|
uprv_memcpy(&localClone->cnv, cnv, sizeof(UConverter));
|
|
|
|
uprv_memcpy(&localClone->mydata, cnv->extraInfo, sizeof(UConverterDataHZ));
|
|
localClone->cnv.extraInfo = &localClone->mydata;
|
|
localClone->cnv.isExtraLocal = TRUE;
|
|
|
|
/* deep-clone the sub-converter */
|
|
size = (int32_t)sizeof(UConverter);
|
|
((UConverterDataHZ*)localClone->cnv.extraInfo)->gbConverter =
|
|
ucnv_safeClone(((UConverterDataHZ*)cnv->extraInfo)->gbConverter, &localClone->subCnv, &size, status);
|
|
|
|
return &localClone->cnv;
|
|
}
|
|
|
|
static void
|
|
_HZ_GetUnicodeSet(const UConverter *cnv,
|
|
USetAdder *sa,
|
|
UConverterUnicodeSet which,
|
|
UErrorCode *pErrorCode) {
|
|
/* the tilde '~' is hardcoded in the converter */
|
|
sa->add(sa->set, 0x7e);
|
|
|
|
/* add all of the code points that the sub-converter handles */
|
|
((UConverterDataHZ*)cnv->extraInfo)->
|
|
gbConverter->sharedData->impl->
|
|
getUnicodeSet(((UConverterDataHZ*)cnv->extraInfo)->gbConverter,
|
|
sa, which, pErrorCode);
|
|
}
|
|
|
|
static const UConverterImpl _HZImpl={
|
|
|
|
UCNV_HZ,
|
|
|
|
NULL,
|
|
NULL,
|
|
|
|
_HZOpen,
|
|
_HZClose,
|
|
_HZReset,
|
|
|
|
UConverter_toUnicode_HZ_OFFSETS_LOGIC,
|
|
UConverter_toUnicode_HZ_OFFSETS_LOGIC,
|
|
UConverter_fromUnicode_HZ_OFFSETS_LOGIC,
|
|
UConverter_fromUnicode_HZ_OFFSETS_LOGIC,
|
|
NULL,
|
|
|
|
NULL,
|
|
NULL,
|
|
_HZ_WriteSub,
|
|
_HZ_SafeClone,
|
|
_HZ_GetUnicodeSet
|
|
};
|
|
|
|
static const UConverterStaticData _HZStaticData={
|
|
sizeof(UConverterStaticData),
|
|
"HZ",
|
|
0,
|
|
UCNV_IBM,
|
|
UCNV_HZ,
|
|
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 _HZData={
|
|
sizeof(UConverterSharedData),
|
|
~((uint32_t) 0),
|
|
NULL,
|
|
NULL,
|
|
&_HZStaticData,
|
|
FALSE,
|
|
&_HZImpl,
|
|
0
|
|
};
|
|
|
|
#endif /* #if !UCONFIG_NO_LEGACY_CONVERSION */
|