261 lines
8 KiB
C++
261 lines
8 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) 2000-2006, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* ucnv_cb.c:
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* External APIs for the ICU's codeset conversion library
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* Helena Shih
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*
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* Modification History:
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*
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* Date Name Description
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* 7/28/2000 srl Implementation
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*/
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/**
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* @name Character Conversion C API
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*
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_CONVERSION
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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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/* need to update the offsets when the target moves. */
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/* Note: Recursion may occur in the cb functions, be sure to update the offsets correctly
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if you don't use ucnv_cbXXX functions. Make sure you don't use the same callback within
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the same call stack if the complexity arises. */
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U_CAPI void U_EXPORT2
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ucnv_cbFromUWriteBytes (UConverterFromUnicodeArgs *args,
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const char* source,
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int32_t length,
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int32_t offsetIndex,
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UErrorCode * err)
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{
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if(U_FAILURE(*err)) {
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return;
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}
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ucnv_fromUWriteBytes(
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args->converter,
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source, length,
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&args->target, args->targetLimit,
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&args->offsets, offsetIndex,
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err);
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}
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U_CAPI void U_EXPORT2
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ucnv_cbFromUWriteUChars(UConverterFromUnicodeArgs *args,
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const UChar** source,
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const UChar* sourceLimit,
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int32_t offsetIndex,
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UErrorCode * err)
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{
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/*
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This is a fun one. Recursion can occur - we're basically going to
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just retry shoving data through the same converter. Note, if you got
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here through some kind of invalid sequence, you maybe should emit a
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reset sequence of some kind and/or call ucnv_reset(). Since this
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IS an actual conversion, take care that you've changed the callback
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or the data, or you'll get an infinite loop.
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Please set the err value to something reasonable before calling
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into this.
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*/
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char *oldTarget;
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if(U_FAILURE(*err))
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{
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return;
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}
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oldTarget = args->target;
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ucnv_fromUnicode(args->converter,
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&args->target,
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args->targetLimit,
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source,
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sourceLimit,
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NULL, /* no offsets */
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false, /* no flush */
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err);
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if(args->offsets)
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{
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while (args->target != oldTarget) /* if it moved at all.. */
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{
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*(args->offsets)++ = offsetIndex;
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oldTarget++;
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}
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}
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/*
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Note, if you did something like used a Stop subcallback, things would get interesting.
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In fact, here's where we want to return the partially consumed in-source!
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*/
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if(*err == U_BUFFER_OVERFLOW_ERROR)
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/* && (*source < sourceLimit && args->target >= args->targetLimit)
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-- S. Hrcek */
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{
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/* Overflowed the target. Now, we'll write into the charErrorBuffer.
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It's a fixed size. If we overflow it... Hmm */
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char *newTarget;
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const char *newTargetLimit;
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UErrorCode err2 = U_ZERO_ERROR;
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int8_t errBuffLen;
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errBuffLen = args->converter->charErrorBufferLength;
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/* start the new target at the first free slot in the errbuff.. */
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newTarget = (char *)(args->converter->charErrorBuffer + errBuffLen);
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newTargetLimit = (char *)(args->converter->charErrorBuffer +
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sizeof(args->converter->charErrorBuffer));
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if(newTarget >= newTargetLimit)
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{
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*err = U_INTERNAL_PROGRAM_ERROR;
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return;
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}
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/* We're going to tell the converter that the errbuff len is empty.
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This prevents the existing errbuff from being 'flushed' out onto
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itself. If the errbuff is needed by the converter this time,
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we're hosed - we're out of space! */
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args->converter->charErrorBufferLength = 0;
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ucnv_fromUnicode(args->converter,
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&newTarget,
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newTargetLimit,
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source,
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sourceLimit,
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NULL,
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false,
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&err2);
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/* We can go ahead and overwrite the length here. We know just how
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to recalculate it. */
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args->converter->charErrorBufferLength = (int8_t)(
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newTarget - (char*)args->converter->charErrorBuffer);
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if((newTarget >= newTargetLimit) || (err2 == U_BUFFER_OVERFLOW_ERROR))
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{
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/* now we're REALLY in trouble.
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Internal program error - callback shouldn't have written this much
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data!
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*/
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*err = U_INTERNAL_PROGRAM_ERROR;
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return;
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}
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/*else {*/
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/* sub errs could be invalid/truncated/illegal chars or w/e.
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These might want to be passed on up.. But the problem is, we already
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need to pass U_BUFFER_OVERFLOW_ERROR. That has to override these
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other errs.. */
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/*
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if(U_FAILURE(err2))
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??
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*/
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/*}*/
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}
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}
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U_CAPI void U_EXPORT2
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ucnv_cbFromUWriteSub (UConverterFromUnicodeArgs *args,
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int32_t offsetIndex,
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UErrorCode * err)
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{
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UConverter *converter;
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int32_t length;
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if(U_FAILURE(*err)) {
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return;
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}
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converter = args->converter;
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length = converter->subCharLen;
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if(length == 0) {
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return;
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}
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if(length < 0) {
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/*
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* Write/convert the substitution string. Its real length is -length.
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* Unlike the escape callback, we need not change the converter's
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* callback function because ucnv_setSubstString() verified that
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* the string can be converted, so we will not get a conversion error
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* and will not recurse.
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* At worst we should get a U_BUFFER_OVERFLOW_ERROR.
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*/
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const UChar *source = (const UChar *)converter->subChars;
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ucnv_cbFromUWriteUChars(args, &source, source - length, offsetIndex, err);
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return;
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}
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if(converter->sharedData->impl->writeSub!=NULL) {
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converter->sharedData->impl->writeSub(args, offsetIndex, err);
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}
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else if(converter->subChar1!=0 && (uint16_t)converter->invalidUCharBuffer[0]<=(uint16_t)0xffu) {
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/*
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TODO: Is this untestable because the MBCS converter has a writeSub function to call
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and the other converters don't use subChar1?
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*/
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ucnv_cbFromUWriteBytes(args,
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(const char *)&converter->subChar1, 1,
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offsetIndex, err);
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}
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else {
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ucnv_cbFromUWriteBytes(args,
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(const char *)converter->subChars, length,
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offsetIndex, err);
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}
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}
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U_CAPI void U_EXPORT2
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ucnv_cbToUWriteUChars (UConverterToUnicodeArgs *args,
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const UChar* source,
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int32_t length,
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int32_t offsetIndex,
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UErrorCode * err)
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{
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if(U_FAILURE(*err)) {
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return;
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}
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ucnv_toUWriteUChars(
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args->converter,
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source, length,
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&args->target, args->targetLimit,
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&args->offsets, offsetIndex,
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err);
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}
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U_CAPI void U_EXPORT2
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ucnv_cbToUWriteSub (UConverterToUnicodeArgs *args,
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int32_t offsetIndex,
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UErrorCode * err)
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{
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static const UChar kSubstituteChar1 = 0x1A, kSubstituteChar = 0xFFFD;
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/* could optimize this case, just one uchar */
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if(args->converter->invalidCharLength == 1 && args->converter->subChar1 != 0) {
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ucnv_cbToUWriteUChars(args, &kSubstituteChar1, 1, offsetIndex, err);
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} else {
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ucnv_cbToUWriteUChars(args, &kSubstituteChar, 1, offsetIndex, err);
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}
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}
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#endif
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