| // © 2016 and later: Unicode, Inc. and others. |
| // License & terms of use: http://www.unicode.org/copyright.html |
| /* |
| ********************************************************************** |
| * Copyright (C) 2000-2006, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| ********************************************************************** |
| * ucnv_cb.c: |
| * External APIs for the ICU's codeset conversion library |
| * Helena Shih |
| * |
| * Modification History: |
| * |
| * Date Name Description |
| * 7/28/2000 srl Implementation |
| */ |
| |
| /** |
| * @name Character Conversion C API |
| * |
| */ |
| |
| #include "unicode/utypes.h" |
| |
| #if !UCONFIG_NO_CONVERSION |
| |
| #include "unicode/ucnv_cb.h" |
| #include "ucnv_bld.h" |
| #include "ucnv_cnv.h" |
| #include "cmemory.h" |
| |
| /* need to update the offsets when the target moves. */ |
| /* Note: Recursion may occur in the cb functions, be sure to update the offsets correctly |
| if you don't use ucnv_cbXXX functions. Make sure you don't use the same callback within |
| the same call stack if the complexity arises. */ |
| U_CAPI void U_EXPORT2 |
| ucnv_cbFromUWriteBytes (UConverterFromUnicodeArgs *args, |
| const char* source, |
| int32_t length, |
| int32_t offsetIndex, |
| UErrorCode * err) |
| { |
| if(U_FAILURE(*err)) { |
| return; |
| } |
| |
| ucnv_fromUWriteBytes( |
| args->converter, |
| source, length, |
| &args->target, args->targetLimit, |
| &args->offsets, offsetIndex, |
| err); |
| } |
| |
| U_CAPI void U_EXPORT2 |
| ucnv_cbFromUWriteUChars(UConverterFromUnicodeArgs *args, |
| const UChar** source, |
| const UChar* sourceLimit, |
| int32_t offsetIndex, |
| UErrorCode * err) |
| { |
| /* |
| This is a fun one. Recursion can occur - we're basically going to |
| just retry shoving data through the same converter. Note, if you got |
| here through some kind of invalid sequence, you maybe should emit a |
| reset sequence of some kind and/or call ucnv_reset(). Since this |
| IS an actual conversion, take care that you've changed the callback |
| or the data, or you'll get an infinite loop. |
| |
| Please set the err value to something reasonable before calling |
| into this. |
| */ |
| |
| char *oldTarget; |
| |
| if(U_FAILURE(*err)) |
| { |
| return; |
| } |
| |
| oldTarget = args->target; |
| |
| ucnv_fromUnicode(args->converter, |
| &args->target, |
| args->targetLimit, |
| source, |
| sourceLimit, |
| NULL, /* no offsets */ |
| FALSE, /* no flush */ |
| err); |
| |
| if(args->offsets) |
| { |
| while (args->target != oldTarget) /* if it moved at all.. */ |
| { |
| *(args->offsets)++ = offsetIndex; |
| oldTarget++; |
| } |
| } |
| |
| /* |
| Note, if you did something like used a Stop subcallback, things would get interesting. |
| In fact, here's where we want to return the partially consumed in-source! |
| */ |
| if(*err == U_BUFFER_OVERFLOW_ERROR) |
| /* && (*source < sourceLimit && args->target >= args->targetLimit) |
| -- S. Hrcek */ |
| { |
| /* Overflowed the target. Now, we'll write into the charErrorBuffer. |
| It's a fixed size. If we overflow it... Hmm */ |
| char *newTarget; |
| const char *newTargetLimit; |
| UErrorCode err2 = U_ZERO_ERROR; |
| |
| int8_t errBuffLen; |
| |
| errBuffLen = args->converter->charErrorBufferLength; |
| |
| /* start the new target at the first free slot in the errbuff.. */ |
| newTarget = (char *)(args->converter->charErrorBuffer + errBuffLen); |
| |
| newTargetLimit = (char *)(args->converter->charErrorBuffer + |
| sizeof(args->converter->charErrorBuffer)); |
| |
| if(newTarget >= newTargetLimit) |
| { |
| *err = U_INTERNAL_PROGRAM_ERROR; |
| return; |
| } |
| |
| /* We're going to tell the converter that the errbuff len is empty. |
| This prevents the existing errbuff from being 'flushed' out onto |
| itself. If the errbuff is needed by the converter this time, |
| we're hosed - we're out of space! */ |
| |
| args->converter->charErrorBufferLength = 0; |
| |
| ucnv_fromUnicode(args->converter, |
| &newTarget, |
| newTargetLimit, |
| source, |
| sourceLimit, |
| NULL, |
| FALSE, |
| &err2); |
| |
| /* We can go ahead and overwrite the length here. We know just how |
| to recalculate it. */ |
| |
| args->converter->charErrorBufferLength = (int8_t)( |
| newTarget - (char*)args->converter->charErrorBuffer); |
| |
| if((newTarget >= newTargetLimit) || (err2 == U_BUFFER_OVERFLOW_ERROR)) |
| { |
| /* now we're REALLY in trouble. |
| Internal program error - callback shouldn't have written this much |
| data! |
| */ |
| *err = U_INTERNAL_PROGRAM_ERROR; |
| return; |
| } |
| /*else {*/ |
| /* sub errs could be invalid/truncated/illegal chars or w/e. |
| These might want to be passed on up.. But the problem is, we already |
| need to pass U_BUFFER_OVERFLOW_ERROR. That has to override these |
| other errs.. */ |
| |
| /* |
| if(U_FAILURE(err2)) |
| ?? |
| */ |
| /*}*/ |
| } |
| } |
| |
| U_CAPI void U_EXPORT2 |
| ucnv_cbFromUWriteSub (UConverterFromUnicodeArgs *args, |
| int32_t offsetIndex, |
| UErrorCode * err) |
| { |
| UConverter *converter; |
| int32_t length; |
| |
| if(U_FAILURE(*err)) { |
| return; |
| } |
| converter = args->converter; |
| length = converter->subCharLen; |
| |
| if(length == 0) { |
| return; |
| } |
| |
| if(length < 0) { |
| /* |
| * Write/convert the substitution string. Its real length is -length. |
| * Unlike the escape callback, we need not change the converter's |
| * callback function because ucnv_setSubstString() verified that |
| * the string can be converted, so we will not get a conversion error |
| * and will not recurse. |
| * At worst we should get a U_BUFFER_OVERFLOW_ERROR. |
| */ |
| const UChar *source = (const UChar *)converter->subChars; |
| ucnv_cbFromUWriteUChars(args, &source, source - length, offsetIndex, err); |
| return; |
| } |
| |
| if(converter->sharedData->impl->writeSub!=NULL) { |
| converter->sharedData->impl->writeSub(args, offsetIndex, err); |
| } |
| else if(converter->subChar1!=0 && (uint16_t)converter->invalidUCharBuffer[0]<=(uint16_t)0xffu) { |
| /* |
| TODO: Is this untestable because the MBCS converter has a writeSub function to call |
| and the other converters don't use subChar1? |
| */ |
| ucnv_cbFromUWriteBytes(args, |
| (const char *)&converter->subChar1, 1, |
| offsetIndex, err); |
| } |
| else { |
| ucnv_cbFromUWriteBytes(args, |
| (const char *)converter->subChars, length, |
| offsetIndex, err); |
| } |
| } |
| |
| U_CAPI void U_EXPORT2 |
| ucnv_cbToUWriteUChars (UConverterToUnicodeArgs *args, |
| const UChar* source, |
| int32_t length, |
| int32_t offsetIndex, |
| UErrorCode * err) |
| { |
| if(U_FAILURE(*err)) { |
| return; |
| } |
| |
| ucnv_toUWriteUChars( |
| args->converter, |
| source, length, |
| &args->target, args->targetLimit, |
| &args->offsets, offsetIndex, |
| err); |
| } |
| |
| U_CAPI void U_EXPORT2 |
| ucnv_cbToUWriteSub (UConverterToUnicodeArgs *args, |
| int32_t offsetIndex, |
| UErrorCode * err) |
| { |
| static const UChar kSubstituteChar1 = 0x1A, kSubstituteChar = 0xFFFD; |
| |
| /* could optimize this case, just one uchar */ |
| if(args->converter->invalidCharLength == 1 && args->converter->subChar1 != 0) { |
| ucnv_cbToUWriteUChars(args, &kSubstituteChar1, 1, offsetIndex, err); |
| } else { |
| ucnv_cbToUWriteUChars(args, &kSubstituteChar, 1, offsetIndex, err); |
| } |
| } |
| |
| #endif |
