1362 lines
48 KiB
C
1362 lines
48 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 2000, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: ucnvscsu.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: 2000nov18
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* created by: Markus W. Scherer
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*
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* This is an implementation of the Standard Compression Scheme for Unicode
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* as defined in http://www.unicode.org/unicode/reports/tr6/ .
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* Reserved commands and window settings are treated as illegal sequences and will
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* result in callback calls.
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*/
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#include "unicode/utypes.h"
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#include "unicode/ucnv.h"
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#include "unicode/ucnv_cb.h"
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#include "ucnv_bld.h"
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#include "ucnv_cnv.h"
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#include "cmemory.h"
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/* SCSU definitions --------------------------------------------------------- */
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/* SCSU command byte values */
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enum {
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SQ0=0x01, /* Quote from window pair 0 */
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SQ7=0x08, /* Quote from window pair 7 */
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SDX=0x0B, /* Define a window as extended */
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Srs=0x0C, /* reserved */
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SQU=0x0E, /* Quote a single Unicode character */
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SCU=0x0F, /* Change to Unicode mode */
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SC0=0x10, /* Select window 0 */
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SC7=0x17, /* Select window 7 */
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SD0=0x18, /* Define and select window 0 */
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SD7=0x1F, /* Define and select window 7 */
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UC0=0xE0, /* Select window 0 */
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UC7=0xE7, /* Select window 7 */
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UD0=0xE8, /* Define and select window 0 */
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UD7=0xEF, /* Define and select window 7 */
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UQU=0xF0, /* Quote a single Unicode character */
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UDX=0xF1, /* Define a Window as extended */
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Urs=0xF2 /* reserved */
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};
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enum {
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/*
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* Unicode code points from 3400 to E000 are not adressible by
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* dynamic window, since in these areas no short run alphabets are
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* found. Therefore add gapOffset to all values from gapThreshold.
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*/
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gapThreshold=0x68,
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gapOffset=0xAC00,
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/* values between reservedStart and fixedThreshold are reserved */
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reservedStart=0xA8,
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/* use table of predefined fixed offsets for values from fixedThreshold */
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fixedThreshold=0xF9
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};
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/* constant offsets for the 8 static windows */
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static const uint32_t staticOffsets[8]={
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0x0000, /* ASCII for quoted tags */
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0x0080, /* Latin - 1 Supplement (for access to punctuation) */
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0x0100, /* Latin Extended-A */
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0x0300, /* Combining Diacritical Marks */
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0x2000, /* General Punctuation */
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0x2080, /* Currency Symbols */
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0x2100, /* Letterlike Symbols and Number Forms */
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0x3000 /* CJK Symbols and punctuation */
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};
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/* initial offsets for the 8 dynamic (sliding) windows */
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static const uint32_t initialDynamicOffsets[8]={
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0x0080, /* Latin-1 */
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0x00C0, /* Latin Extended A */
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0x0400, /* Cyrillic */
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0x0600, /* Arabic */
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0x0900, /* Devanagari */
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0x3040, /* Hiragana */
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0x30A0, /* Katakana */
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0xFF00 /* Fullwidth ASCII */
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};
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/* Table of fixed predefined Offsets */
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static const uint32_t fixedOffsets[]={
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/* 0xF9 */ 0x00C0, /* Latin-1 Letters + half of Latin Extended A */
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/* 0xFA */ 0x0250, /* IPA extensions */
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/* 0xFB */ 0x0370, /* Greek */
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/* 0xFC */ 0x0530, /* Armenian */
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/* 0xFD */ 0x3040, /* Hiragana */
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/* 0xFE */ 0x30A0, /* Katakana */
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/* 0xFF */ 0xFF60 /* Halfwidth Katakana */
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};
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/* state values */
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enum {
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readCommand,
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quotePairOne,
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quotePairTwo,
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quoteOne,
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definePairOne,
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definePairTwo,
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defineOne
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};
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typedef struct SCSUData {
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/* dynamic window offsets, intitialize to default values from initialDynamicOffsets */
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uint32_t toUDynamicOffsets[8];
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uint32_t fromUDynamicOffsets[8];
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/* state machine state - toUnicode */
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UBool toUIsSingleByteMode;
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uint8_t toUState;
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int8_t toUQuoteWindow, toUDynamicWindow;
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uint8_t toUByteOne;
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uint8_t toUPadding[3];
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/* state machine state - fromUnicode */
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UBool fromUIsSingleByteMode;
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int8_t fromUDynamicWindow;
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/*
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* windowUse[] keeps track of the use of the dynamic windows:
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* At nextWindowUseIndex there is the least recently used window,
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* and the following windows (in a wrapping manner) are more and more
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* recently used.
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* At nextWindowUseIndex-1 there is the most recently used window.
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*/
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uint8_t locale;
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int8_t nextWindowUseIndex;
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int8_t windowUse[8];
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} SCSUData;
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static const int8_t initialWindowUse[8]={ 7, 0, 3, 2, 4, 5, 6, 1 };
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static const int8_t initialWindowUse_ja[8]={ 3, 2, 4, 1, 0, 7, 5, 6 };
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enum {
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lGeneric, l_ja
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};
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/* MBCS setup functions ----------------------------------------------------- */
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U_CFUNC void
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_SCSUReset(UConverter *cnv, UConverterResetChoice choice) {
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SCSUData *scsu=(SCSUData *)cnv->extraInfo;
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if(choice<=UCNV_RESET_TO_UNICODE) {
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/* reset toUnicode */
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uprv_memcpy(scsu->toUDynamicOffsets, initialDynamicOffsets, 32);
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scsu->toUIsSingleByteMode=TRUE;
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scsu->toUState=readCommand;
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scsu->toUQuoteWindow=scsu->toUDynamicWindow=0;
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scsu->toUByteOne=0;
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cnv->toULength=0;
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}
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if(choice!=UCNV_RESET_TO_UNICODE) {
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/* reset fromUnicode */
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uprv_memcpy(scsu->fromUDynamicOffsets, initialDynamicOffsets, 32);
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scsu->fromUIsSingleByteMode=TRUE;
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scsu->fromUDynamicWindow=0;
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scsu->nextWindowUseIndex=0;
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switch(scsu->locale) {
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case l_ja:
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uprv_memcpy(scsu->windowUse, initialWindowUse_ja, 8);
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break;
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default:
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uprv_memcpy(scsu->windowUse, initialWindowUse, 8);
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break;
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}
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cnv->fromUSurrogateLead=0;
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}
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}
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U_CFUNC void
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_SCSUOpen(UConverter *cnv,
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const char *name,
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const char *locale,
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uint32_t options,
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UErrorCode *pErrorCode) {
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cnv->extraInfo=uprv_malloc(sizeof(SCSUData));
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if(cnv->extraInfo!=NULL) {
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if(locale!=NULL && locale[0]=='j' && locale[1]=='a' && (locale[2]==0 || locale[2]==' ')) {
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((SCSUData *)cnv->extraInfo)->locale=l_ja;
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} else {
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((SCSUData *)cnv->extraInfo)->locale=lGeneric;
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}
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_SCSUReset(cnv, UCNV_RESET_BOTH);
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} else {
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*pErrorCode=U_MEMORY_ALLOCATION_ERROR;
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}
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}
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U_CFUNC void
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_SCSUClose(UConverter *cnv) {
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if(cnv->extraInfo!=NULL) {
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uprv_free(cnv->extraInfo);
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cnv->extraInfo=NULL;
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}
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}
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/* SCSU-to-Unicode conversion functions ------------------------------------- */
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/* ### check operator precedence | << + < */
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U_CFUNC void
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_SCSUToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
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UErrorCode *pErrorCode) {
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UConverter *cnv;
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SCSUData *scsu;
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const uint8_t *source, *sourceLimit;
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UChar *target;
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const UChar *targetLimit;
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int32_t *offsets;
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UBool isSingleByteMode;
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uint8_t state, byteOne;
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int8_t quoteWindow, dynamicWindow;
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int32_t sourceIndex, nextSourceIndex;
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uint8_t b;
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/* set up the local pointers */
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cnv=pArgs->converter;
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scsu=(SCSUData *)cnv->extraInfo;
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source=(const uint8_t *)pArgs->source;
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sourceLimit=(const uint8_t *)pArgs->sourceLimit;
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target=pArgs->target;
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targetLimit=pArgs->targetLimit;
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offsets=pArgs->offsets;
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/* get the state machine state */
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isSingleByteMode=scsu->toUIsSingleByteMode;
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state=scsu->toUState;
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quoteWindow=scsu->toUQuoteWindow;
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dynamicWindow=scsu->toUDynamicWindow;
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byteOne=scsu->toUByteOne;
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/* sourceIndex=-1 if the current character began in the previous buffer */
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sourceIndex=state==readCommand ? 0 : -1;
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nextSourceIndex=0;
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/*
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* conversion "loop"
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*
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* For performance, this is not a normal C loop.
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* Instead, there are two code blocks for the two SCSU modes.
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* The function branches to either one, and a change of the mode is done with a goto to
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* the other branch.
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*
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* Each branch has two conventional loops:
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* - a fast-path loop for the most common codes in the mode
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* - a loop for all other codes in the mode
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* When the fast-path runs into a code that it cannot handle, its loop ends and it
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* runs into the following loop to handle the other codes.
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* The end of the input or output buffer is also handled by the slower loop.
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* The slow loop jumps (goto) to the fast-path loop again as soon as possible.
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*
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* The callback handling is done by jumping (goto) to the callback section at the end
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* of the function. From there, it either jumps to here to continue or to
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* the endloop section to clean up and return.
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*/
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loop:
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if(isSingleByteMode) {
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/* fast path for single-byte mode */
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if(state==readCommand) {
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fastSingle:
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while(source<sourceLimit && target<targetLimit && (b=*source)>=0x20) {
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++source;
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++nextSourceIndex;
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if(b<=0x7f) {
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/* write US-ASCII graphic character or DEL */
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*target++=(UChar)b;
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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}
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} else {
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/* write from dynamic window */
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uint32_t c=scsu->toUDynamicOffsets[dynamicWindow]+(b&0x7f);
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if(c<=0xffff) {
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*target++=(UChar)c;
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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}
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} else {
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/* output surrogate pair */
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*target++=(UChar)(0xd7c0+(c>>10));
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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}
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if(target<targetLimit) {
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*target++=(UChar)(0xdc00|(c&0x3ff));
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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}
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} else {
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/* target overflow */
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cnv->UCharErrorBuffer[0]=(UChar)(0xdc00|(c&0x3ff));
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cnv->UCharErrorBufferLength=1;
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*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
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goto endloop;
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}
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}
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}
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sourceIndex=nextSourceIndex;
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}
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}
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/* normal state machine for single-byte mode, minus handling for what fastSingle covers */
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singleByteMode:
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while(source<sourceLimit) {
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if(target>=targetLimit) {
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/* target is full */
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*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
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break;
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}
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b=*source++;
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++nextSourceIndex;
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switch(state) {
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case readCommand:
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/* redundant conditions are commented out */
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/* here: b<0x20 because otherwise we would be in fastSingle */
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if((1UL<<b)&0x2601 /* binary 0010 0110 0000 0001, check for b==0xd || b==0xa || b==9 || b==0 */) {
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/* CR/LF/TAB/NUL */
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*target++=(UChar)b;
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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}
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sourceIndex=nextSourceIndex;
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goto fastSingle;
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} else if(SC0<=b) {
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if(b<=SC7) {
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dynamicWindow=b-SC0;
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sourceIndex=nextSourceIndex;
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goto fastSingle;
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} else /* if(SD0<=b && b<=SD7) */ {
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dynamicWindow=b-SD0;
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state=defineOne;
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}
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} else if(/* SQ0<=b && */ b<=SQ7) {
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quoteWindow=b-SQ0;
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state=quoteOne;
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} else if(b==SDX) {
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state=definePairOne;
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} else if(b==SQU) {
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state=quotePairOne;
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} else if(b==SCU) {
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sourceIndex=nextSourceIndex;
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isSingleByteMode=FALSE;
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goto fastUnicode;
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} else /* Srs */ {
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/* callback(illegal) */
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cnv->invalidCharBuffer[0]=b;
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cnv->invalidCharLength=1;
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goto callback;
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}
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break;
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case quotePairOne:
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byteOne=b;
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state=quotePairTwo;
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break;
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case quotePairTwo:
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*target++=((UChar)byteOne<<8)|b;
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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}
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sourceIndex=nextSourceIndex;
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state=readCommand;
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goto fastSingle;
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case quoteOne:
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if(b<0x80) {
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/* all static offsets are in the BMP */
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*target++=(UChar)(staticOffsets[quoteWindow]+b);
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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}
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} else {
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/* write from dynamic window */
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uint32_t c=scsu->toUDynamicOffsets[quoteWindow]+(b&0x7f);
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if(c<=0xffff) {
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*target++=(UChar)c;
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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}
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} else {
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/* output surrogate pair */
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*target++=(UChar)(0xd7c0+(c>>10));
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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}
|
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if(target<targetLimit) {
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*target++=(UChar)(0xdc00|(c&0x3ff));
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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}
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} else {
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/* target overflow */
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cnv->UCharErrorBuffer[0]=(UChar)(0xdc00|(c&0x3ff));
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cnv->UCharErrorBufferLength=1;
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*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
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goto endloop;
|
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}
|
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}
|
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}
|
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sourceIndex=nextSourceIndex;
|
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state=readCommand;
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goto fastSingle;
|
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case definePairOne:
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dynamicWindow=(b>>5)&7;
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byteOne=b&0x1f;
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state=definePairTwo;
|
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break;
|
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case definePairTwo:
|
|
scsu->toUDynamicOffsets[dynamicWindow]=0x10000+(byteOne<<15UL | b<<7UL);
|
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sourceIndex=nextSourceIndex;
|
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state=readCommand;
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goto fastSingle;
|
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case defineOne:
|
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if(b==0) {
|
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/* callback(illegal): Reserved window offset value 0 */
|
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cnv->invalidCharBuffer[0]=SD0+dynamicWindow;
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cnv->invalidCharBuffer[1]=b;
|
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cnv->invalidCharLength=2;
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goto callback;
|
|
} else if(b<gapThreshold) {
|
|
scsu->toUDynamicOffsets[dynamicWindow]=b<<7UL;
|
|
} else if((uint8_t)(b-gapThreshold)<(reservedStart-gapThreshold)) {
|
|
scsu->toUDynamicOffsets[dynamicWindow]=(b<<7UL)+gapOffset;
|
|
} else if(b>=fixedThreshold) {
|
|
scsu->toUDynamicOffsets[dynamicWindow]=fixedOffsets[b-fixedThreshold];
|
|
} else {
|
|
/* callback(illegal): Reserved window offset value 0xa8..0xf8 */
|
|
cnv->invalidCharBuffer[0]=SD0+dynamicWindow;
|
|
cnv->invalidCharBuffer[1]=b;
|
|
cnv->invalidCharLength=2;
|
|
goto callback;
|
|
}
|
|
sourceIndex=nextSourceIndex;
|
|
state=readCommand;
|
|
goto fastSingle;
|
|
}
|
|
}
|
|
} else {
|
|
/* fast path for Unicode mode */
|
|
if(state==readCommand) {
|
|
fastUnicode:
|
|
while(source+1<sourceLimit && target<targetLimit && (uint8_t)((b=*source)-UC0)>(Urs-UC0)) {
|
|
*target++=((UChar)b<<8)|source[1];
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
sourceIndex=nextSourceIndex;
|
|
nextSourceIndex+=2;
|
|
source+=2;
|
|
}
|
|
}
|
|
|
|
/* normal state machine for Unicode mode */
|
|
/* unicodeByteMode: */
|
|
while(source<sourceLimit) {
|
|
if(target>=targetLimit) {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
b=*source++;
|
|
++nextSourceIndex;
|
|
switch(state) {
|
|
case readCommand:
|
|
if((uint8_t)(b-UC0)>(Urs-UC0)) {
|
|
byteOne=b;
|
|
state=quotePairTwo;
|
|
} else if(/* UC0<=b && */ b<=UC7) {
|
|
dynamicWindow=b-UC0;
|
|
sourceIndex=nextSourceIndex;
|
|
isSingleByteMode=TRUE;
|
|
goto fastSingle;
|
|
} else if(/* UD0<=b && */ b<=UD7) {
|
|
dynamicWindow=b-UD0;
|
|
isSingleByteMode=TRUE;
|
|
state=defineOne;
|
|
goto singleByteMode;
|
|
} else if(b==UDX) {
|
|
isSingleByteMode=TRUE;
|
|
state=definePairOne;
|
|
goto singleByteMode;
|
|
} else if(b==UQU) {
|
|
state=quotePairOne;
|
|
} else /* Urs */ {
|
|
/* callback(illegal) */
|
|
cnv->invalidCharBuffer[0]=b;
|
|
cnv->invalidCharLength=1;
|
|
goto callback;
|
|
}
|
|
break;
|
|
case quotePairOne:
|
|
byteOne=b;
|
|
state=quotePairTwo;
|
|
break;
|
|
case quotePairTwo:
|
|
*target++=((UChar)byteOne<<8)|b;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
sourceIndex=nextSourceIndex;
|
|
state=readCommand;
|
|
goto fastUnicode;
|
|
}
|
|
}
|
|
}
|
|
endloop:
|
|
|
|
if(pArgs->flush && source>=sourceLimit) {
|
|
/* reset the state for the next conversion */
|
|
if(state!=readCommand && U_SUCCESS(*pErrorCode)) {
|
|
/* a character byte sequence remains incomplete */
|
|
*pErrorCode=U_TRUNCATED_CHAR_FOUND;
|
|
}
|
|
_SCSUReset(cnv, UCNV_RESET_TO_UNICODE);
|
|
} else {
|
|
/* set the converter state back into UConverter */
|
|
scsu->toUIsSingleByteMode=isSingleByteMode;
|
|
scsu->toUState=state;
|
|
scsu->toUQuoteWindow=quoteWindow;
|
|
scsu->toUDynamicWindow=dynamicWindow;
|
|
scsu->toUByteOne=byteOne;
|
|
}
|
|
|
|
finish:
|
|
/* write back the updated pointers */
|
|
pArgs->source=(const char *)source;
|
|
pArgs->target=target;
|
|
pArgs->offsets=offsets;
|
|
return;
|
|
|
|
callback:
|
|
/* call the callback function with all the preparations and post-processing */
|
|
/* update the arguments structure */
|
|
pArgs->source=(const char *)source;
|
|
pArgs->target=target;
|
|
pArgs->offsets=offsets;
|
|
|
|
/* the current bytes were copied to invalidCharBuffer before the goto callback jump */
|
|
|
|
/* set the converter state in UConverter to deal with the next character */
|
|
scsu->toUIsSingleByteMode=isSingleByteMode;
|
|
scsu->toUState=readCommand;
|
|
scsu->toUQuoteWindow=quoteWindow;
|
|
scsu->toUDynamicWindow=dynamicWindow;
|
|
scsu->toUByteOne=0;
|
|
|
|
/* call the callback function */
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
cnv->fromCharErrorBehaviour(cnv->toUContext, pArgs, cnv->invalidCharBuffer, cnv->invalidCharLength, UCNV_ILLEGAL, pErrorCode);
|
|
|
|
/* get the converter state from UConverter */
|
|
isSingleByteMode=scsu->toUIsSingleByteMode;
|
|
state=scsu->toUState;
|
|
quoteWindow=scsu->toUQuoteWindow;
|
|
dynamicWindow=scsu->toUDynamicWindow;
|
|
byteOne=scsu->toUByteOne;
|
|
|
|
/* update target and deal with offsets if necessary */
|
|
offsets=ucnv_updateCallbackOffsets(offsets, pArgs->target-target, sourceIndex);
|
|
target=pArgs->target;
|
|
|
|
/* update the source pointer and index */
|
|
sourceIndex=nextSourceIndex+((const uint8_t *)pArgs->source-source);
|
|
source=(const uint8_t *)pArgs->source;
|
|
|
|
/*
|
|
* If the callback overflowed the target, then we need to
|
|
* stop here with an overflow indication.
|
|
*/
|
|
if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
|
|
goto endloop;
|
|
} else if(cnv->UCharErrorBufferLength>0) {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
goto endloop;
|
|
} else if(U_FAILURE(*pErrorCode)) {
|
|
/* break on error */
|
|
_SCSUReset(cnv, UCNV_RESET_TO_UNICODE);
|
|
goto finish;
|
|
} else {
|
|
goto loop;
|
|
}
|
|
}
|
|
|
|
U_CFUNC UChar32
|
|
_SCSUGetNextUChar(UConverterToUnicodeArgs *pArgs,
|
|
UErrorCode *pErrorCode) {
|
|
return ucnv_getNextUCharFromToUImpl(pArgs, _SCSUToUnicodeWithOffsets, TRUE, pErrorCode);
|
|
}
|
|
|
|
/* SCSU-from-Unicode conversion functions ----------------------------------- */
|
|
|
|
/*
|
|
* This SCSU Encoder is fairly simple but uses all SCSU commands to achieve
|
|
* reasonable results. The lookahead is minimal.
|
|
* Many cases are simple:
|
|
* A character fits directly into the current mode, a dynamic or static window,
|
|
* or is not compressible. These cases are tested first.
|
|
* Real compression heuristics are applied to the rest, in code branches for
|
|
* single/Unicode mode and BMP/supplementary code points.
|
|
* The heuristics used here are extremely simple.
|
|
*/
|
|
|
|
/* get the number of the window that this character is in, or -1 */
|
|
static int8_t
|
|
getWindow(const uint32_t offsets[8], uint32_t c) {
|
|
int i;
|
|
for(i=0; i<8; ++i) {
|
|
if((uint32_t)(c-offsets[i])<=0x7f) {
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/* is the character in the dynamic window starting at the offset, or in the direct-encoded range? */
|
|
static UBool
|
|
isInOffsetWindowOrDirect(uint32_t offset, uint32_t c) {
|
|
return c<=offset+0x7f &&
|
|
(c>=offset || c<=0x7f &&
|
|
(c>=0x20 || (1UL<<c)&0x2601));
|
|
/* binary 0010 0110 0000 0001,
|
|
check for b==0xd || b==0xa || b==9 || b==0 */
|
|
}
|
|
|
|
/*
|
|
* getNextDynamicWindow returns the next dynamic window to be redefined
|
|
*/
|
|
static int8_t
|
|
getNextDynamicWindow(SCSUData *scsu) {
|
|
int8_t window=scsu->windowUse[scsu->nextWindowUseIndex];
|
|
if(++scsu->nextWindowUseIndex==8) {
|
|
scsu->nextWindowUseIndex=0;
|
|
}
|
|
return window;
|
|
}
|
|
|
|
/*
|
|
* useDynamicWindow() adjusts
|
|
* windowUse[] and nextWindowUseIndex for the algorithm to choose
|
|
* the next dynamic window to be defined;
|
|
* a subclass may override it and provide its own algorithm.
|
|
*/
|
|
static void
|
|
useDynamicWindow(SCSUData *scsu, int8_t window) {
|
|
/*
|
|
* move the existing window, which just became the most recently used one,
|
|
* up in windowUse[] to nextWindowUseIndex-1
|
|
*/
|
|
|
|
/* first, find the index of the window - backwards to favor the more recently used windows */
|
|
int i, j;
|
|
|
|
i=scsu->nextWindowUseIndex;
|
|
do {
|
|
if(--i<0) {
|
|
i=7;
|
|
}
|
|
} while(scsu->windowUse[i]!=window);
|
|
|
|
/* now copy each windowUse[i+1] to [i] */
|
|
j=i+1;
|
|
if(j==8) {
|
|
j=0;
|
|
}
|
|
while(j!=scsu->nextWindowUseIndex) {
|
|
scsu->windowUse[i]=scsu->windowUse[j];
|
|
i=j;
|
|
if(++j==8) { j=0; }
|
|
}
|
|
|
|
/* finally, set the window into the most recently used index */
|
|
scsu->windowUse[i]=window;
|
|
}
|
|
|
|
/*
|
|
* calculate the offset and the code for a dynamic window that contains the character
|
|
* takes fixed offsets into account
|
|
* the offset of the window is stored in the offset variable,
|
|
* the code is returned
|
|
*
|
|
* return offset code: -1 none <=0xff code for SDn/UDn else code for SDX/UDX, subtract 0x200 to get the true code
|
|
*/
|
|
static int
|
|
getDynamicOffset(uint32_t c, uint32_t *pOffset) {
|
|
int i;
|
|
|
|
for(i=0; i<7; ++i) {
|
|
if((uint32_t)(c-fixedOffsets[i])<=0x7f) {
|
|
*pOffset=fixedOffsets[i];
|
|
return 0xf9+i;
|
|
}
|
|
}
|
|
|
|
if(c<0x80) {
|
|
/* No dynamic window for US-ASCII. */
|
|
return -1;
|
|
} else if(c<0x3400 ||
|
|
(uint32_t)(c-0x10000)<(0x14000-0x10000) ||
|
|
(uint32_t)(c-0x1d000)<=(0x1ffff-0x1d000)
|
|
) {
|
|
/* This character is in a code range for a "small", i.e., reasonably windowable, script. */
|
|
*pOffset=c&0x7fffff80;
|
|
return (int)(c>>7);
|
|
} else if(0xe000<=c && c!=0xfeff && c<0xfff0) {
|
|
/* For these characters we need to take the gapOffset into account. */
|
|
*pOffset=c&0x7fffff80;
|
|
return (int)((c-gapOffset)>>7);
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Idea for compression:
|
|
* - save SCSUData and other state before really starting work
|
|
* - at endloop, see if compression could be better with just unicode mode
|
|
* - don't do this if a callback has been called
|
|
* - if unicode mode would be smaller, then override the results with it - may need SCU at the beginning
|
|
* - different buffer handling!
|
|
*
|
|
* Drawback or need for corrective handling:
|
|
* it is desirable to encode U+feff as SQU fe ff for the SCSU signature, and
|
|
* it is desirable to start a document in US-ASCII/Latin-1 for as long as possible
|
|
* not only for compression but also for HTML/XML documents with following charset/encoding announcers.
|
|
*
|
|
* How to achieve both?
|
|
* - Only replace the result after an SDX or SCU?
|
|
*/
|
|
|
|
U_CFUNC void
|
|
_SCSUFromUnicodeWithOffsets(UConverterFromUnicodeArgs *pArgs,
|
|
UErrorCode *pErrorCode) {
|
|
UConverter *cnv;
|
|
SCSUData *scsu;
|
|
const UChar *source, *sourceLimit;
|
|
uint8_t *target;
|
|
int32_t targetCapacity;
|
|
int32_t *offsets;
|
|
|
|
UBool isSingleByteMode;
|
|
uint8_t dynamicWindow;
|
|
uint32_t currentOffset;
|
|
|
|
uint32_t c, delta;
|
|
|
|
int32_t sourceIndex, nextSourceIndex;
|
|
|
|
uint32_t i;
|
|
int32_t length;
|
|
|
|
/* variables for compression heuristics */
|
|
uint32_t offset;
|
|
UChar lead, trail;
|
|
int code;
|
|
int8_t window;
|
|
|
|
/* set up the local pointers */
|
|
cnv=pArgs->converter;
|
|
scsu=(SCSUData *)cnv->extraInfo;
|
|
|
|
/* set up the local pointers */
|
|
source=pArgs->source;
|
|
sourceLimit=pArgs->sourceLimit;
|
|
target=(uint8_t *)pArgs->target;
|
|
targetCapacity=pArgs->targetLimit-pArgs->target;
|
|
offsets=pArgs->offsets;
|
|
|
|
/* get the state machine state */
|
|
isSingleByteMode=scsu->fromUIsSingleByteMode;
|
|
dynamicWindow=scsu->fromUDynamicWindow;
|
|
currentOffset=scsu->fromUDynamicOffsets[dynamicWindow];
|
|
|
|
c=cnv->fromUSurrogateLead;
|
|
|
|
/* sourceIndex=-1 if the current character began in the previous buffer */
|
|
sourceIndex= c==0 ? 0 : -1;
|
|
nextSourceIndex=0;
|
|
|
|
/* similar conversion "loop" as in toUnicode */
|
|
loop:
|
|
if(isSingleByteMode) {
|
|
if(c!=0 && targetCapacity>0) {
|
|
goto getTrailSingle;
|
|
}
|
|
|
|
/* state machine for single-byte mode */
|
|
/* singleByteMode: */
|
|
while(source<sourceLimit) {
|
|
if(targetCapacity<=0) {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
c=*source++;
|
|
++nextSourceIndex;
|
|
|
|
if((c-0x20)<=0x5f) {
|
|
/* pass US-ASCII graphic character through */
|
|
*target++=(uint8_t)c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
--targetCapacity;
|
|
} else if(c<0x20) {
|
|
if((1UL<<c)&0x2601 /* binary 0010 0110 0000 0001, check for b==0xd || b==0xa || b==9 || b==0 */) {
|
|
/* CR/LF/TAB/NUL */
|
|
*target++=(uint8_t)c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
--targetCapacity;
|
|
} else {
|
|
/* quote C0 control character */
|
|
c|=SQ0<<8;
|
|
length=2;
|
|
goto outputBytes;
|
|
}
|
|
} else if((delta=c-currentOffset)<=0x7f) {
|
|
/* use the current dynamic window */
|
|
*target++=(uint8_t)delta|0x80;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
--targetCapacity;
|
|
} else if(UTF_IS_SURROGATE(c)) {
|
|
if(UTF_IS_SURROGATE_FIRST(c)) {
|
|
getTrailSingle:
|
|
lead=(UChar)c;
|
|
if(source<sourceLimit) {
|
|
/* test the following code unit */
|
|
trail=*source;
|
|
if(UTF_IS_SECOND_SURROGATE(trail)) {
|
|
++source;
|
|
++nextSourceIndex;
|
|
c=UTF16_GET_PAIR_VALUE(c, trail);
|
|
/* convert this surrogate code point */
|
|
/* exit this condition tree */
|
|
} else {
|
|
/* this is an unmatched lead code unit (1st surrogate) */
|
|
/* callback(illegal) */
|
|
goto callback;
|
|
}
|
|
} else {
|
|
/* no more input */
|
|
break;
|
|
}
|
|
} else {
|
|
/* this is an unmatched trail code unit (2nd surrogate) */
|
|
/* callback(illegal) */
|
|
goto callback;
|
|
}
|
|
|
|
/* compress supplementary character U+10000..U+10ffff */
|
|
if((delta=c-currentOffset)<=0x7f) {
|
|
/* use the current dynamic window */
|
|
*target++=(uint8_t)delta|0x80;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
--targetCapacity;
|
|
} else if((window=getWindow(scsu->fromUDynamicOffsets, c))>=0) {
|
|
/* there is a dynamic window that contains this character, change to it */
|
|
dynamicWindow=window;
|
|
currentOffset=scsu->fromUDynamicOffsets[dynamicWindow];
|
|
useDynamicWindow(scsu, dynamicWindow);
|
|
c=((uint32_t)(SC0+window)<<8)|(c-currentOffset)|0x80;
|
|
length=2;
|
|
goto outputBytes;
|
|
} else if((code=getDynamicOffset(c, &offset))>=0) {
|
|
/* might check if there are more characters in this window to come */
|
|
/* define an extended window with this character */
|
|
code-=0x200;
|
|
dynamicWindow=getNextDynamicWindow(scsu);
|
|
currentOffset=scsu->fromUDynamicOffsets[dynamicWindow]=offset;
|
|
useDynamicWindow(scsu, dynamicWindow);
|
|
c=((uint32_t)SDX<<24)|((uint32_t)window<<21)|((uint32_t)code<<8)|(c-currentOffset)|0x80;
|
|
length=4;
|
|
goto outputBytes;
|
|
} else {
|
|
/* change to Unicode mode and output this (lead, trail) pair */
|
|
isSingleByteMode=FALSE;
|
|
*target++=(uint8_t)SCU;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
--targetCapacity;
|
|
c=((uint32_t)lead<<16)|trail;
|
|
length=4;
|
|
goto outputBytes;
|
|
}
|
|
} else if(c<0xa0) {
|
|
/* quote C1 control character */
|
|
c=(c&0x7f)|(SQ0+1)<<8; /* SQ0+1==SQ1 */
|
|
length=2;
|
|
goto outputBytes;
|
|
} else if(c==0xfeff || c>=0xfff0) {
|
|
/* quote signature character=byte order mark and specials */
|
|
c|=SQU<<16;
|
|
length=3;
|
|
goto outputBytes;
|
|
} else {
|
|
/* compress all other BMP characters */
|
|
if((window=getWindow(scsu->fromUDynamicOffsets, c))>=0) {
|
|
/* there is a window defined that contains this character - switch to it or quote from it? */
|
|
if(source>=sourceLimit || isInOffsetWindowOrDirect(scsu->fromUDynamicOffsets[window], *source)) {
|
|
/* change to dynamic window */
|
|
dynamicWindow=window;
|
|
currentOffset=scsu->fromUDynamicOffsets[dynamicWindow];
|
|
useDynamicWindow(scsu, dynamicWindow);
|
|
c=((uint32_t)(SC0+window)<<8)|(c-currentOffset)|0x80;
|
|
length=2;
|
|
goto outputBytes;
|
|
} else {
|
|
/* quote from dynamic window */
|
|
c=((uint32_t)(SQ0+window)<<8)|(c-scsu->fromUDynamicOffsets[window])|0x80;
|
|
length=2;
|
|
goto outputBytes;
|
|
}
|
|
} else if((window=getWindow(staticOffsets, c))>=0) {
|
|
/* quote from static window */
|
|
c=((uint32_t)(SQ0+window)<<8)|(c-staticOffsets[window]);
|
|
length=2;
|
|
goto outputBytes;
|
|
} else if((code=getDynamicOffset(c, &offset))>=0) {
|
|
/* define a dynamic window with this character */
|
|
dynamicWindow=getNextDynamicWindow(scsu);
|
|
currentOffset=scsu->fromUDynamicOffsets[dynamicWindow]=offset;
|
|
useDynamicWindow(scsu, dynamicWindow);
|
|
c=((uint32_t)(SD0+dynamicWindow)<<16)|((uint32_t)code<<8)|(c-currentOffset)|0x80;
|
|
length=3;
|
|
goto outputBytes;
|
|
} else if((uint32_t)(c-0x3400)<(0xd800-0x3400) &&
|
|
(source>=sourceLimit || (uint32_t)(*source-0x3400)<(0xd800-0x3400))
|
|
) {
|
|
/*
|
|
* this character is not compressible (a BMP ideograph or similar);
|
|
* switch to Unicode mode if this is the last character in the block
|
|
* or there is at least one more ideograph following immediately
|
|
*/
|
|
isSingleByteMode=FALSE;
|
|
c|=SCU<<16;
|
|
length=3;
|
|
goto outputBytes;
|
|
} else {
|
|
/* quote Unicode */
|
|
c|=SQU<<16;
|
|
length=3;
|
|
goto outputBytes;
|
|
}
|
|
}
|
|
|
|
/* normal end of conversion: prepare for a new character */
|
|
c=0;
|
|
sourceIndex=nextSourceIndex;
|
|
}
|
|
} else {
|
|
if(c!=0 && targetCapacity>0) {
|
|
goto getTrailUnicode;
|
|
}
|
|
|
|
/* state machine for Unicode mode */
|
|
/* unicodeByteMode: */
|
|
while(source<sourceLimit) {
|
|
if(targetCapacity<=0) {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
c=*source++;
|
|
++nextSourceIndex;
|
|
|
|
if((uint32_t)(c-0x3400)<(0xd800-0x3400)) {
|
|
/* not compressible, write character directly */
|
|
if(targetCapacity>=2) {
|
|
*target++=(uint8_t)(c>>8);
|
|
*target++=(uint8_t)c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex;
|
|
}
|
|
targetCapacity-=2;
|
|
} else {
|
|
length=2;
|
|
goto outputBytes;
|
|
}
|
|
} else if((uint32_t)(c-0x3400)>=(0xf300-0x3400) /* c<0x3400 || c>=0xf300 */) {
|
|
/* compress BMP character if the following one is not an uncompressible ideograph */
|
|
if(!(source<sourceLimit && (uint32_t)(*source-0x3400)<(0xd800-0x3400))) {
|
|
if(((uint32_t)(c-0x30)<10 || (uint32_t)(c-0x61)<26 || (uint32_t)(c-0x41)<26)) {
|
|
/* ASCII digit or letter */
|
|
isSingleByteMode=TRUE;
|
|
c|=((uint32_t)(UC0+dynamicWindow)<<8)|c;
|
|
length=2;
|
|
goto outputBytes;
|
|
} else if((window=getWindow(scsu->fromUDynamicOffsets, c))>=0) {
|
|
/* there is a dynamic window that contains this character, change to it */
|
|
isSingleByteMode=TRUE;
|
|
dynamicWindow=window;
|
|
currentOffset=scsu->fromUDynamicOffsets[dynamicWindow];
|
|
useDynamicWindow(scsu, dynamicWindow);
|
|
c=((uint32_t)(UC0+window)<<8)|(c-currentOffset)|0x80;
|
|
length=2;
|
|
goto outputBytes;
|
|
} else if((code=getDynamicOffset(c, &offset))>=0) {
|
|
/* define a dynamic window with this character */
|
|
isSingleByteMode=TRUE;
|
|
dynamicWindow=getNextDynamicWindow(scsu);
|
|
currentOffset=scsu->fromUDynamicOffsets[dynamicWindow]=offset;
|
|
useDynamicWindow(scsu, dynamicWindow);
|
|
c=((uint32_t)(UD0+dynamicWindow)<<16)|((uint32_t)code<<8)|(c-currentOffset)|0x80;
|
|
length=3;
|
|
goto outputBytes;
|
|
}
|
|
}
|
|
|
|
/* don't know how to compress this character, just write it directly */
|
|
length=2;
|
|
goto outputBytes;
|
|
} else if(c<0xe000) {
|
|
/* c is a surrogate */
|
|
if(UTF_IS_SURROGATE_FIRST(c)) {
|
|
getTrailUnicode:
|
|
lead=(UChar)c;
|
|
if(source<sourceLimit) {
|
|
/* test the following code unit */
|
|
trail=*source;
|
|
if(UTF_IS_SECOND_SURROGATE(trail)) {
|
|
++source;
|
|
++nextSourceIndex;
|
|
c=UTF16_GET_PAIR_VALUE(c, trail);
|
|
/* convert this surrogate code point */
|
|
/* exit this condition tree */
|
|
} else {
|
|
/* this is an unmatched lead code unit (1st surrogate) */
|
|
/* callback(illegal) */
|
|
goto callback;
|
|
}
|
|
} else {
|
|
/* no more input */
|
|
break;
|
|
}
|
|
} else {
|
|
/* this is an unmatched trail code unit (2nd surrogate) */
|
|
/* callback(illegal) */
|
|
goto callback;
|
|
}
|
|
|
|
/* compress supplementary character */
|
|
if( (window=getWindow(scsu->fromUDynamicOffsets, c))>=0 &&
|
|
!(source<sourceLimit && (uint32_t)(*source-0x3400)<(0xd800-0x3400))
|
|
) {
|
|
/*
|
|
* there is a dynamic window that contains this character and
|
|
* the following character is not uncompressible,
|
|
* change to the window
|
|
*/
|
|
isSingleByteMode=TRUE;
|
|
dynamicWindow=window;
|
|
currentOffset=scsu->fromUDynamicOffsets[dynamicWindow];
|
|
useDynamicWindow(scsu, dynamicWindow);
|
|
c=((uint32_t)(UC0+window)<<8)|(c-currentOffset)|0x80;
|
|
length=2;
|
|
goto outputBytes;
|
|
} else if(source<sourceLimit && lead==*source && /* too lazy to check trail in same window as source[1] */
|
|
(code=getDynamicOffset(c, &offset))>=0
|
|
) {
|
|
/* two supplementary characters in (probably) the same window - define an extended one */
|
|
isSingleByteMode=TRUE;
|
|
code-=0x200;
|
|
dynamicWindow=getNextDynamicWindow(scsu);
|
|
currentOffset=scsu->fromUDynamicOffsets[dynamicWindow]=offset;
|
|
useDynamicWindow(scsu, dynamicWindow);
|
|
c=((uint32_t)UDX<<24)|((uint32_t)window<<21)|((uint32_t)code<<8)|(c-currentOffset)|0x80;
|
|
length=4;
|
|
goto outputBytes;
|
|
} else {
|
|
/* don't know how to compress this character, just write it directly */
|
|
c=((uint32_t)lead<<16)|trail;
|
|
length=4;
|
|
goto outputBytes;
|
|
}
|
|
} else /* 0xe000<=c<0xf300 */ {
|
|
/* quote to avoid SCSU tags */
|
|
c|=UQU<<16;
|
|
length=3;
|
|
goto outputBytes;
|
|
}
|
|
|
|
/* normal end of conversion: prepare for a new character */
|
|
c=0;
|
|
sourceIndex=nextSourceIndex;
|
|
}
|
|
}
|
|
endloop:
|
|
|
|
if(pArgs->flush && source>=sourceLimit) {
|
|
/* reset the state for the next conversion */
|
|
if(c!=0 && U_SUCCESS(*pErrorCode)) {
|
|
/* a character byte sequence remains incomplete */
|
|
*pErrorCode=U_TRUNCATED_CHAR_FOUND;
|
|
}
|
|
_SCSUReset(cnv, UCNV_RESET_FROM_UNICODE);
|
|
} else {
|
|
/* set the converter state back into UConverter */
|
|
scsu->fromUIsSingleByteMode=isSingleByteMode;
|
|
scsu->fromUDynamicWindow=dynamicWindow;
|
|
|
|
cnv->fromUSurrogateLead=(UChar)c;
|
|
}
|
|
|
|
finish:
|
|
/* write back the updated pointers */
|
|
pArgs->source=source;
|
|
pArgs->target=(char *)target;
|
|
pArgs->offsets=offsets;
|
|
return;
|
|
|
|
outputBytes:
|
|
/* write the output character bytes from c and length [code copied from ucnvmbcs.c] */
|
|
/* from the first if in the loop we know that targetCapacity>0 */
|
|
if(length<=targetCapacity) {
|
|
if(offsets==NULL) {
|
|
switch(length) {
|
|
/* each branch falls through to the next one */
|
|
case 4:
|
|
*target++=(uint8_t)(c>>24);
|
|
case 3:
|
|
*target++=(uint8_t)(c>>16);
|
|
case 2:
|
|
*target++=(uint8_t)(c>>8);
|
|
case 1:
|
|
*target++=(uint8_t)c;
|
|
default:
|
|
/* will never occur */
|
|
break;
|
|
}
|
|
} else {
|
|
switch(length) {
|
|
/* each branch falls through to the next one */
|
|
case 4:
|
|
*target++=(uint8_t)(c>>24);
|
|
*offsets++=sourceIndex;
|
|
case 3:
|
|
*target++=(uint8_t)(c>>16);
|
|
*offsets++=sourceIndex;
|
|
case 2:
|
|
*target++=(uint8_t)(c>>8);
|
|
*offsets++=sourceIndex;
|
|
case 1:
|
|
*target++=(uint8_t)c;
|
|
*offsets++=sourceIndex;
|
|
default:
|
|
/* will never occur */
|
|
break;
|
|
}
|
|
}
|
|
targetCapacity-=length;
|
|
|
|
/* normal end of conversion: prepare for a new character */
|
|
c=0;
|
|
sourceIndex=nextSourceIndex;
|
|
goto loop;
|
|
} else {
|
|
uint8_t *p;
|
|
|
|
/*
|
|
* We actually do this backwards here:
|
|
* In order to save an intermediate variable, we output
|
|
* first to the overflow buffer what does not fit into the
|
|
* regular target.
|
|
*/
|
|
/* we know that 1<=targetCapacity<length<=4 */
|
|
length-=targetCapacity;
|
|
p=(uint8_t *)cnv->charErrorBuffer;
|
|
switch(length) {
|
|
/* each branch falls through to the next one */
|
|
case 3:
|
|
*p++=(uint8_t)(c>>16);
|
|
case 2:
|
|
*p++=(uint8_t)(c>>8);
|
|
case 1:
|
|
*p=(uint8_t)c;
|
|
default:
|
|
/* will never occur */
|
|
break;
|
|
}
|
|
cnv->charErrorBufferLength=(int8_t)length;
|
|
|
|
/* now output what fits into the regular target */
|
|
c>>=8*length; /* length was reduced by targetCapacity */
|
|
switch(targetCapacity) {
|
|
/* each branch falls through to the next one */
|
|
case 3:
|
|
*target++=(uint8_t)(c>>16);
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
case 2:
|
|
*target++=(uint8_t)(c>>8);
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
case 1:
|
|
*target++=(uint8_t)c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
default:
|
|
/* will never occur */
|
|
break;
|
|
}
|
|
|
|
/* target overflow */
|
|
targetCapacity=0;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
c=0;
|
|
goto endloop;
|
|
}
|
|
|
|
callback:
|
|
/* call the callback function with all the preparations and post-processing */
|
|
/* update the arguments structure */
|
|
pArgs->source=source;
|
|
pArgs->target=(char *)target;
|
|
pArgs->offsets=offsets;
|
|
|
|
/* set the converter state in UConverter to deal with the next character */
|
|
scsu->fromUIsSingleByteMode=isSingleByteMode;
|
|
scsu->fromUDynamicWindow=dynamicWindow;
|
|
cnv->fromUSurrogateLead=0;
|
|
|
|
/* write the code point as code units */
|
|
i=0;
|
|
UTF_APPEND_CHAR_UNSAFE(cnv->invalidUCharBuffer, i, c);
|
|
cnv->invalidUCharLength=(int8_t)i;
|
|
|
|
/* call the callback function */
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
cnv->fromUCharErrorBehaviour(cnv->fromUContext, pArgs, cnv->invalidUCharBuffer, i, c, UCNV_ILLEGAL, pErrorCode);
|
|
|
|
/* get the converter state from UConverter */
|
|
isSingleByteMode=scsu->fromUIsSingleByteMode;
|
|
dynamicWindow=scsu->fromUDynamicWindow;
|
|
currentOffset=scsu->fromUDynamicOffsets[dynamicWindow];
|
|
c=cnv->fromUSurrogateLead;
|
|
|
|
/* update target and deal with offsets if necessary */
|
|
offsets=ucnv_updateCallbackOffsets(offsets, ((uint8_t *)pArgs->target)-target, sourceIndex);
|
|
target=(uint8_t *)pArgs->target;
|
|
|
|
/* update the source pointer and index */
|
|
sourceIndex=nextSourceIndex+(pArgs->source-source);
|
|
source=pArgs->source;
|
|
targetCapacity=(uint8_t *)pArgs->targetLimit-target;
|
|
|
|
/*
|
|
* If the callback overflowed the target, then we need to
|
|
* stop here with an overflow indication.
|
|
*/
|
|
if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
|
|
goto endloop;
|
|
} else if(cnv->charErrorBufferLength>0) {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
goto endloop;
|
|
} else if(U_FAILURE(*pErrorCode)) {
|
|
/* break on error */
|
|
_SCSUReset(cnv, UCNV_RESET_FROM_UNICODE);
|
|
goto finish;
|
|
} else {
|
|
goto loop;
|
|
}
|
|
}
|
|
|
|
/* miscellaneous ------------------------------------------------------------ */
|
|
|
|
U_CFUNC void
|
|
_SCSUWriteSub(UConverterFromUnicodeArgs *pArgs,
|
|
int32_t offsetIndex,
|
|
UErrorCode *pErrorCode) {
|
|
static const char squ_fffd[]={ (char)SQU, (char)0xff, (char)0xfd };
|
|
|
|
/*
|
|
* The substitution character is U+fffd={ ff, fd }.
|
|
* If the SCSU converter is in Unicode mode, then these two bytes just need to
|
|
* be written. Otherwise, this character is quoted.
|
|
*/
|
|
if(((SCSUData *)pArgs->converter->extraInfo)->fromUIsSingleByteMode) {
|
|
/* single-byte mode: quote Unicode */
|
|
ucnv_cbFromUWriteBytes(pArgs,
|
|
squ_fffd, 3,
|
|
offsetIndex, pErrorCode);
|
|
} else {
|
|
/* Unicode mode: just write U+fffd */
|
|
ucnv_cbFromUWriteBytes(pArgs,
|
|
squ_fffd+1, 2,
|
|
offsetIndex, pErrorCode);
|
|
}
|
|
}
|
|
|
|
static const UConverterImpl _SCSUImpl={
|
|
UCNV_SCSU,
|
|
|
|
NULL,
|
|
NULL,
|
|
|
|
_SCSUOpen,
|
|
_SCSUClose,
|
|
_SCSUReset,
|
|
|
|
_SCSUToUnicodeWithOffsets,
|
|
_SCSUToUnicodeWithOffsets,
|
|
_SCSUFromUnicodeWithOffsets,
|
|
_SCSUFromUnicodeWithOffsets,
|
|
_SCSUGetNextUChar,
|
|
|
|
NULL,
|
|
NULL,
|
|
_SCSUWriteSub
|
|
};
|
|
|
|
static const UConverterStaticData _SCSUStaticData={
|
|
sizeof(UConverterStaticData),
|
|
"SCSU",
|
|
0, /* CCSID for SCSU */
|
|
UCNV_IBM, UCNV_SCSU,
|
|
1, 3, /* one UChar generates at least 1 byte and at most 3 bytes */
|
|
{ 0x0e, 0xff, 0xfd, 0 }, 3, /* ### the subchar really must be written by an SCSU function! */
|
|
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 _SCSUData={
|
|
sizeof(UConverterSharedData), ~((uint32_t)0),
|
|
NULL, NULL, &_SCSUStaticData, FALSE, &_SCSUImpl,
|
|
0
|
|
};
|
|
|
|
/* ### clarify: if an error occurs, does a converter reset itself? or is it in a defined or undefined state? */
|