626 lines
25 KiB
C++
626 lines
25 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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**********************************************************************
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* Copyright (C) 2000-2015, 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: UTF-8
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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 && !UCONFIG_ONLY_HTML_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 "unicode/utf16.h"
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#include "ucnv_bld.h"
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#include "ucnv_cnv.h"
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#include "ucnv_imp.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) UPRV_BLOCK_MACRO_BEGIN { \
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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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} UPRV_BLOCK_MACRO_END
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typedef struct{
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UConverter* gbConverter;
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int32_t targetIndex;
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int32_t sourceIndex;
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UBool isEscapeAppended;
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UBool isStateDBCS;
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UBool isTargetUCharDBCS;
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UBool isEmptySegment;
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}UConverterDataHZ;
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U_CDECL_BEGIN
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static void U_CALLCONV
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_HZOpen(UConverter *cnv, UConverterLoadArgs *pArgs, UErrorCode *errorCode){
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UConverter *gbConverter;
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if(pArgs->onlyTestIsLoadable) {
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ucnv_canCreateConverter("GBK", errorCode); /* errorCode carries result */
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return;
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}
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gbConverter = ucnv_open("GBK", errorCode);
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if(U_FAILURE(*errorCode)) {
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return;
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}
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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_calloc(1, sizeof(UConverterDataHZ));
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if(cnv->extraInfo != NULL){
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((UConverterDataHZ*)cnv->extraInfo)->gbConverter = gbConverter;
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}
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else {
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ucnv_close(gbConverter);
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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 U_CALLCONV
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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 U_CALLCONV
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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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((UConverterDataHZ*)cnv->extraInfo)->isEmptySegment = 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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* Note that the formal syntax in RFC 1842 is invalid. I assume that the
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* intended definition of single-byte-segment is as follows (pedberg):
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* single-byte-segment = single-byte-seq 1*single-byte-char
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*/
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static void U_CALLCONV
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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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int32_t mySourceChar = 0x0000;
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UConverterDataHZ* myData=(UConverterDataHZ*)(args->converter->extraInfo);
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tempBuf[0]=0;
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tempBuf[1]=0;
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/* Calling code already handles this situation. */
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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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if(args->converter->mode == UCNV_TILDE) {
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/* second byte after ~ */
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args->converter->mode=0;
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switch(mySourceChar) {
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case 0x0A:
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/* no output for ~\n (line-continuation marker) */
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continue;
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case UCNV_TILDE:
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if(args->offsets) {
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args->offsets[myTarget - args->target]=(int32_t)(mySource - args->source - 2);
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}
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*(myTarget++)=(UChar)mySourceChar;
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myData->isEmptySegment = false;
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continue;
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case UCNV_OPEN_BRACE:
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case UCNV_CLOSE_BRACE:
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myData->isStateDBCS = (mySourceChar == UCNV_OPEN_BRACE);
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if (myData->isEmptySegment) {
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myData->isEmptySegment = false; /* we are handling it, reset to avoid future spurious errors */
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*err = U_ILLEGAL_ESCAPE_SEQUENCE;
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args->converter->toUCallbackReason = UCNV_IRREGULAR;
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args->converter->toUBytes[0] = UCNV_TILDE;
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args->converter->toUBytes[1] = static_cast<uint8_t>(mySourceChar);
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args->converter->toULength = 2;
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args->target = myTarget;
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args->source = mySource;
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return;
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}
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myData->isEmptySegment = true;
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continue;
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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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/*
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* Ticket 5691: consistent illegal sequences:
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* - We include at least the first byte in the illegal sequence.
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* - If any of the non-initial bytes could be the start of a character,
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* we stop the illegal sequence before the first one of those.
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*/
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myData->isEmptySegment = false; /* different error here, reset this to avoid spurious future error */
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*err = U_ILLEGAL_ESCAPE_SEQUENCE;
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args->converter->toUBytes[0] = UCNV_TILDE;
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if( myData->isStateDBCS ?
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(0x21 <= mySourceChar && mySourceChar <= 0x7e) :
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mySourceChar <= 0x7f
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) {
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/* The current byte could be the start of a character: Back it out. */
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args->converter->toULength = 1;
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--mySource;
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} else {
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/* Include the current byte in the illegal sequence. */
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args->converter->toUBytes[1] = static_cast<uint8_t>(mySourceChar);
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args->converter->toULength = 2;
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}
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args->target = myTarget;
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args->source = mySource;
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return;
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}
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} else if(myData->isStateDBCS) {
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if(args->converter->toUnicodeStatus == 0x00){
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/* lead byte */
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if(mySourceChar == UCNV_TILDE) {
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args->converter->mode = UCNV_TILDE;
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} else {
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/* add another bit to distinguish a 0 byte from not having seen a lead byte */
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args->converter->toUnicodeStatus = (uint32_t) (mySourceChar | 0x100);
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myData->isEmptySegment = false; /* the segment has something, either valid or will produce a different error, so reset this */
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}
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continue;
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}
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else{
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/* trail byte */
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int leadIsOk, trailIsOk;
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uint32_t leadByte = args->converter->toUnicodeStatus & 0xff;
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targetUniChar = 0xffff;
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/*
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* Ticket 5691: consistent illegal sequences:
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* - We include at least the first byte in the illegal sequence.
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* - If any of the non-initial bytes could be the start of a character,
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* we stop the illegal sequence before the first one of those.
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*
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* In HZ DBCS, if the second byte is in the 21..7e range,
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* we report only the first byte as the illegal sequence.
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* Otherwise we convert or report the pair of bytes.
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*/
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leadIsOk = (uint8_t)(leadByte - 0x21) <= (0x7d - 0x21);
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trailIsOk = (uint8_t)(mySourceChar - 0x21) <= (0x7e - 0x21);
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if (leadIsOk && trailIsOk) {
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tempBuf[0] = (char) (leadByte+0x80) ;
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tempBuf[1] = (char) (mySourceChar+0x80);
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targetUniChar = ucnv_MBCSSimpleGetNextUChar(myData->gbConverter->sharedData,
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tempBuf, 2, args->converter->useFallback);
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mySourceChar= (leadByte << 8) | mySourceChar;
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} else if (trailIsOk) {
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/* report a single illegal byte and continue with the following DBCS starter byte */
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--mySource;
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mySourceChar = (int32_t)leadByte;
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} else {
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/* report a pair of illegal bytes if the second byte is not a DBCS starter */
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/* add another bit so that the code below writes 2 bytes in case of error */
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mySourceChar= 0x10000 | (leadByte << 8) | mySourceChar;
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}
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args->converter->toUnicodeStatus =0x00;
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}
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}
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else{
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if(mySourceChar == UCNV_TILDE) {
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args->converter->mode = UCNV_TILDE;
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continue;
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} else if(mySourceChar <= 0x7f) {
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targetUniChar = (UChar)mySourceChar; /* ASCII */
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myData->isEmptySegment = false; /* the segment has something valid */
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} else {
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targetUniChar = 0xffff;
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myData->isEmptySegment = false; /* different error here, reset this to avoid spurious future error */
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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 /* targetUniChar>=0xfffe */ {
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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(mySourceChar > 0xff){
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args->converter->toUBytes[0] = (uint8_t)(mySourceChar >> 8);
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args->converter->toUBytes[1] = (uint8_t)mySourceChar;
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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 U_CALLCONV
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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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uint32_t targetUniChar = 0x0000;
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UChar32 mySourceChar = 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;
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int len =0;
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const char* escSeq=NULL;
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/* Calling code already handles this situation. */
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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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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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} else if(mySourceChar <= 0x7f) {
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targetUniChar = mySourceChar;
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} else {
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int32_t length= ucnv_MBCSFromUChar32(myConverterData->gbConverter->sharedData,
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mySourceChar,&targetUniChar,args->converter->useFallback);
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/* we can only use lead bytes 21..7D and trail bytes 21..7E */
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if( length == 2 &&
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(uint16_t)(targetUniChar - 0xa1a1) <= (0xfdfe - 0xa1a1) &&
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(uint8_t)(targetUniChar - 0xa1) <= (0xfe - 0xa1)
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) {
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targetUniChar -= 0x8080;
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} else {
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targetUniChar = missingCharMarker;
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}
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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 = 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 = 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);
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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;
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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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}else{
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args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] =(char) (targetUniChar >> 8);
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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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}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(U16_IS_SURROGATE(mySourceChar)) {
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if(U16_IS_SURROGATE_LEAD(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(U16_IS_TRAIL(trail)) {
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++mySourceIndex;
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mySourceChar=U16_GET_SUPPLEMENTARY(args->converter->fromUChar32, trail);
|
|
args->converter->fromUChar32=0x00;
|
|
/* there are no surrogates in GB2312*/
|
|
*err = U_INVALID_CHAR_FOUND;
|
|
/* exit this condition tree */
|
|
} else {
|
|
/* this is an unmatched lead code unit (1st surrogate) */
|
|
/* callback(illegal) */
|
|
*err=U_ILLEGAL_CHAR_FOUND;
|
|
}
|
|
} else {
|
|
/* no more input */
|
|
*err = U_ZERO_ERROR;
|
|
}
|
|
} else {
|
|
/* this is an unmatched trail code unit (2nd surrogate) */
|
|
/* callback(illegal) */
|
|
*err=U_ILLEGAL_CHAR_FOUND;
|
|
}
|
|
} else {
|
|
/* callback(unassigned) for a BMP code point */
|
|
*err = U_INVALID_CHAR_FOUND;
|
|
}
|
|
|
|
args->converter->fromUChar32=mySourceChar;
|
|
break;
|
|
}
|
|
}
|
|
else{
|
|
*err = U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
targetUniChar=missingCharMarker;
|
|
}
|
|
|
|
args->target += myTargetIndex;
|
|
args->source += mySourceIndex;
|
|
myConverterData->isTargetUCharDBCS = isTargetUCharDBCS;
|
|
}
|
|
|
|
static void U_CALLCONV
|
|
_HZ_WriteSub(UConverterFromUnicodeArgs *args, int32_t offsetIndex, UErrorCode *err) {
|
|
UConverter *cnv = args->converter;
|
|
UConverterDataHZ *convData=(UConverterDataHZ *) cnv->extraInfo;
|
|
char *p;
|
|
char buffer[4];
|
|
p = buffer;
|
|
|
|
if( convData->isTargetUCharDBCS){
|
|
*p++= UCNV_TILDE;
|
|
*p++= UCNV_CLOSE_BRACE;
|
|
convData->isTargetUCharDBCS=false;
|
|
}
|
|
*p++= (char)cnv->subChars[0];
|
|
|
|
ucnv_cbFromUWriteBytes(args,
|
|
buffer, (int32_t)(p - buffer),
|
|
offsetIndex, err);
|
|
}
|
|
|
|
/*
|
|
* Structure for cloning an HZ converter into a single memory block.
|
|
*/
|
|
struct cloneHZStruct
|
|
{
|
|
UConverter cnv;
|
|
UConverter subCnv;
|
|
UConverterDataHZ mydata;
|
|
};
|
|
|
|
|
|
static UConverter * U_CALLCONV
|
|
_HZ_SafeClone(const UConverter *cnv,
|
|
void *stackBuffer,
|
|
int32_t *pBufferSize,
|
|
UErrorCode *status)
|
|
{
|
|
struct cloneHZStruct * localClone;
|
|
int32_t size, bufferSizeNeeded = sizeof(struct cloneHZStruct);
|
|
|
|
if (U_FAILURE(*status)){
|
|
return nullptr;
|
|
}
|
|
|
|
if (*pBufferSize == 0){ /* 'preflighting' request - set needed size into *pBufferSize */
|
|
*pBufferSize = bufferSizeNeeded;
|
|
return nullptr;
|
|
}
|
|
|
|
localClone = (struct cloneHZStruct *)stackBuffer;
|
|
/* ucnv.c/ucnv_safeClone() copied the main UConverter already */
|
|
|
|
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 U_CALLCONV
|
|
_HZ_GetUnicodeSet(const UConverter *cnv,
|
|
const USetAdder *sa,
|
|
UConverterUnicodeSet which,
|
|
UErrorCode *pErrorCode) {
|
|
/* HZ converts all of ASCII */
|
|
sa->addRange(sa->set, 0, 0x7f);
|
|
|
|
/* add all of the code points that the sub-converter handles */
|
|
ucnv_MBCSGetFilteredUnicodeSetForUnicode(
|
|
((UConverterDataHZ*)cnv->extraInfo)->gbConverter->sharedData,
|
|
sa, which, UCNV_SET_FILTER_HZ,
|
|
pErrorCode);
|
|
}
|
|
U_CDECL_END
|
|
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,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
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=
|
|
UCNV_IMMUTABLE_SHARED_DATA_INITIALIZER(&_HZStaticData, &_HZImpl);
|
|
|
|
#endif /* #if !UCONFIG_NO_CONVERSION && !UCONFIG_NO_LEGACY_CONVERSION && !UCONFIG_ONLY_HTML_CONVERSION */
|