// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ****************************************************************************** * * Copyright (C) 1998-2016, International Business Machines * Corporation and others. All Rights Reserved. * ****************************************************************************** * * ucnv.c: * Implements APIs for the ICU's codeset conversion library; * mostly calls through internal functions; * created by Bertrand A. Damiba * * Modification History: * * Date Name Description * 04/04/99 helena Fixed internal header inclusion. * 05/09/00 helena Added implementation to handle fallback mappings. * 06/20/2000 helena OS/400 port changes; mostly typecast. */ #include "unicode/utypes.h" #if !UCONFIG_NO_CONVERSION #include <memory> #include "unicode/ustring.h" #include "unicode/ucnv.h" #include "unicode/ucnv_err.h" #include "unicode/uset.h" #include "unicode/utf.h" #include "unicode/utf16.h" #include "putilimp.h" #include "cmemory.h" #include "cstring.h" #include "uassert.h" #include "utracimp.h" #include "ustr_imp.h" #include "ucnv_imp.h" #include "ucnv_cnv.h" #include "ucnv_bld.h" /* size of intermediate and preflighting buffers in ucnv_convert() */ #define CHUNK_SIZE … typedef struct UAmbiguousConverter { const char *name; const char16_t variant5c; } UAmbiguousConverter; static const UAmbiguousConverter ambiguousConverters[]={ { "ibm-897_P100-1995", 0xa5 }, { "ibm-942_P120-1999", 0xa5 }, { "ibm-943_P130-1999", 0xa5 }, { "ibm-946_P100-1995", 0xa5 }, { "ibm-33722_P120-1999", 0xa5 }, { "ibm-1041_P100-1995", 0xa5 }, /*{ "ibm-54191_P100-2006", 0xa5 },*/ /*{ "ibm-62383_P100-2007", 0xa5 },*/ /*{ "ibm-891_P100-1995", 0x20a9 },*/ { "ibm-944_P100-1995", 0x20a9 }, { "ibm-949_P110-1999", 0x20a9 }, { "ibm-1363_P110-1997", 0x20a9 }, { "ISO_2022,locale=ko,version=0", 0x20a9 }, { "ibm-1088_P100-1995", 0x20a9 } }; /*Calls through createConverter */ U_CAPI UConverter* U_EXPORT2 ucnv_open (const char *name, UErrorCode * err) { UConverter *r; if (err == nullptr || U_FAILURE (*err)) { return nullptr; } r = ucnv_createConverter(nullptr, name, err); return r; } U_CAPI UConverter* U_EXPORT2 ucnv_openPackage (const char *packageName, const char *converterName, UErrorCode * err) { return ucnv_createConverterFromPackage(packageName, converterName, err); } /*Extracts the char16_t* to a char* and calls through createConverter */ U_CAPI UConverter* U_EXPORT2 ucnv_openU (const char16_t * name, UErrorCode * err) { char asciiName[UCNV_MAX_CONVERTER_NAME_LENGTH]; if (err == nullptr || U_FAILURE(*err)) return nullptr; if (name == nullptr) return ucnv_open (nullptr, err); if (u_strlen(name) >= UCNV_MAX_CONVERTER_NAME_LENGTH) { *err = U_ILLEGAL_ARGUMENT_ERROR; return nullptr; } return ucnv_open(u_austrcpy(asciiName, name), err); } /* Copy the string that is represented by the UConverterPlatform enum * @param platformString An output buffer * @param platform An enum representing a platform * @return the length of the copied string. */ static int32_t ucnv_copyPlatformString(char *platformString, UConverterPlatform pltfrm) { switch (pltfrm) { case UCNV_IBM: uprv_strcpy(platformString, "ibm-"); return 4; case UCNV_UNKNOWN: break; } /* default to empty string */ *platformString = 0; return 0; } /*Assumes a $platform-#codepage.$CONVERTER_FILE_EXTENSION scheme and calls *through createConverter*/ U_CAPI UConverter* U_EXPORT2 ucnv_openCCSID (int32_t codepage, UConverterPlatform platform, UErrorCode * err) { char myName[UCNV_MAX_CONVERTER_NAME_LENGTH]; int32_t myNameLen; if (err == nullptr || U_FAILURE (*err)) return nullptr; /* ucnv_copyPlatformString could return "ibm-" or "cp" */ myNameLen = ucnv_copyPlatformString(myName, platform); T_CString_integerToString(myName + myNameLen, codepage, 10); return ucnv_createConverter(nullptr, myName, err); } /* Creating a temporary stack-based object that can be used in one thread, and created from a converter that is shared across threads. */ U_CAPI UConverter* U_EXPORT2 ucnv_safeClone(const UConverter* cnv, void *stackBuffer, int32_t *pBufferSize, UErrorCode *status) { UConverter *localConverter, *allocatedConverter; int32_t stackBufferSize; int32_t bufferSizeNeeded; UErrorCode cbErr; UConverterToUnicodeArgs toUArgs = { sizeof(UConverterToUnicodeArgs), true, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr }; UConverterFromUnicodeArgs fromUArgs = { sizeof(UConverterFromUnicodeArgs), true, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr }; UTRACE_ENTRY_OC(UTRACE_UCNV_CLONE); if (status == nullptr || U_FAILURE(*status)){ UTRACE_EXIT_STATUS(status? *status: U_ILLEGAL_ARGUMENT_ERROR); return nullptr; } if (cnv == nullptr) { *status = U_ILLEGAL_ARGUMENT_ERROR; UTRACE_EXIT_STATUS(*status); return nullptr; } UTRACE_DATA3(UTRACE_OPEN_CLOSE, "clone converter %s at %p into stackBuffer %p", ucnv_getName(cnv, status), cnv, stackBuffer); if (cnv->sharedData->impl->safeClone != nullptr) { /* call the custom safeClone function for sizing */ bufferSizeNeeded = 0; cnv->sharedData->impl->safeClone(cnv, nullptr, &bufferSizeNeeded, status); if (U_FAILURE(*status)) { UTRACE_EXIT_STATUS(*status); return nullptr; } } else { /* inherent sizing */ bufferSizeNeeded = sizeof(UConverter); } if (pBufferSize == nullptr) { stackBufferSize = 1; pBufferSize = &stackBufferSize; } else { stackBufferSize = *pBufferSize; if (stackBufferSize <= 0){ /* 'preflighting' request - set needed size into *pBufferSize */ *pBufferSize = bufferSizeNeeded; UTRACE_EXIT_VALUE(bufferSizeNeeded); return nullptr; } } /* Adjust (if necessary) the stackBuffer pointer to be aligned correctly for a UConverter. * TODO(Jira ICU-20736) Redo this using std::align() once g++4.9 compatibility is no longer needed. */ if (stackBuffer) { uintptr_t p = reinterpret_cast<uintptr_t>(stackBuffer); uintptr_t aligned_p = (p + alignof(UConverter) - 1) & ~(alignof(UConverter) - 1); ptrdiff_t pointerAdjustment = aligned_p - p; if (bufferSizeNeeded + pointerAdjustment <= stackBufferSize) { stackBuffer = reinterpret_cast<void *>(aligned_p); stackBufferSize -= static_cast<int32_t>(pointerAdjustment); } else { /* prevent using the stack buffer but keep the size > 0 so that we do not just preflight */ stackBufferSize = 1; } } /* Now, see if we must allocate any memory */ if (stackBufferSize < bufferSizeNeeded || stackBuffer == nullptr) { /* allocate one here...*/ localConverter = allocatedConverter = (UConverter *) uprv_malloc (bufferSizeNeeded); if(localConverter == nullptr) { *status = U_MEMORY_ALLOCATION_ERROR; UTRACE_EXIT_STATUS(*status); return nullptr; } // If pBufferSize was nullptr as the input, pBufferSize is set to &stackBufferSize in this function. if (pBufferSize != &stackBufferSize) { *status = U_SAFECLONE_ALLOCATED_WARNING; } /* record the fact that memory was allocated */ *pBufferSize = bufferSizeNeeded; } else { /* just use the stack buffer */ localConverter = (UConverter*) stackBuffer; allocatedConverter = nullptr; } uprv_memset(localConverter, 0, bufferSizeNeeded); /* Copy initial state */ uprv_memcpy(localConverter, cnv, sizeof(UConverter)); localConverter->isCopyLocal = localConverter->isExtraLocal = false; /* copy the substitution string */ if (cnv->subChars == (uint8_t *)cnv->subUChars) { localConverter->subChars = (uint8_t *)localConverter->subUChars; } else { localConverter->subChars = (uint8_t *)uprv_malloc(UCNV_ERROR_BUFFER_LENGTH * U_SIZEOF_UCHAR); if (localConverter->subChars == nullptr) { uprv_free(allocatedConverter); UTRACE_EXIT_STATUS(*status); return nullptr; } uprv_memcpy(localConverter->subChars, cnv->subChars, UCNV_ERROR_BUFFER_LENGTH * U_SIZEOF_UCHAR); } /* now either call the safeclone fcn or not */ if (cnv->sharedData->impl->safeClone != nullptr) { /* call the custom safeClone function */ localConverter = cnv->sharedData->impl->safeClone(cnv, localConverter, pBufferSize, status); } if(localConverter==nullptr || U_FAILURE(*status)) { if (allocatedConverter != nullptr && allocatedConverter->subChars != (uint8_t *)allocatedConverter->subUChars) { uprv_free(allocatedConverter->subChars); } uprv_free(allocatedConverter); UTRACE_EXIT_STATUS(*status); return nullptr; } /* increment refcount of shared data if needed */ if (cnv->sharedData->isReferenceCounted) { ucnv_incrementRefCount(cnv->sharedData); } if(localConverter == (UConverter*)stackBuffer) { /* we're using user provided data - set to not destroy */ localConverter->isCopyLocal = true; } /* allow callback functions to handle any memory allocation */ toUArgs.converter = fromUArgs.converter = localConverter; cbErr = U_ZERO_ERROR; cnv->fromCharErrorBehaviour(cnv->toUContext, &toUArgs, nullptr, 0, UCNV_CLONE, &cbErr); cbErr = U_ZERO_ERROR; cnv->fromUCharErrorBehaviour(cnv->fromUContext, &fromUArgs, nullptr, 0, 0, UCNV_CLONE, &cbErr); UTRACE_EXIT_PTR_STATUS(localConverter, *status); return localConverter; } U_CAPI UConverter* U_EXPORT2 ucnv_clone(const UConverter* cnv, UErrorCode *status) { return ucnv_safeClone(cnv, nullptr, nullptr, status); } /*Decreases the reference counter in the shared immutable section of the object *and frees the mutable part*/ U_CAPI void U_EXPORT2 ucnv_close (UConverter * converter) { UErrorCode errorCode = U_ZERO_ERROR; UTRACE_ENTRY_OC(UTRACE_UCNV_CLOSE); if (converter == nullptr) { UTRACE_EXIT(); return; } UTRACE_DATA3(UTRACE_OPEN_CLOSE, "close converter %s at %p, isCopyLocal=%b", ucnv_getName(converter, &errorCode), converter, converter->isCopyLocal); /* In order to speed up the close, only call the callbacks when they have been changed. This performance check will only work when the callbacks are set within a shared library or from user code that statically links this code. */ /* first, notify the callback functions that the converter is closed */ if (converter->fromCharErrorBehaviour != UCNV_TO_U_DEFAULT_CALLBACK) { UConverterToUnicodeArgs toUArgs = { sizeof(UConverterToUnicodeArgs), true, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr }; toUArgs.converter = converter; errorCode = U_ZERO_ERROR; converter->fromCharErrorBehaviour(converter->toUContext, &toUArgs, nullptr, 0, UCNV_CLOSE, &errorCode); } if (converter->fromUCharErrorBehaviour != UCNV_FROM_U_DEFAULT_CALLBACK) { UConverterFromUnicodeArgs fromUArgs = { sizeof(UConverterFromUnicodeArgs), true, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr }; fromUArgs.converter = converter; errorCode = U_ZERO_ERROR; converter->fromUCharErrorBehaviour(converter->fromUContext, &fromUArgs, nullptr, 0, 0, UCNV_CLOSE, &errorCode); } if (converter->sharedData->impl->close != nullptr) { converter->sharedData->impl->close(converter); } if (converter->subChars != (uint8_t *)converter->subUChars) { uprv_free(converter->subChars); } if (converter->sharedData->isReferenceCounted) { ucnv_unloadSharedDataIfReady(converter->sharedData); } if(!converter->isCopyLocal){ uprv_free(converter); } UTRACE_EXIT(); } /*returns a single Name from the list, will return nullptr if out of bounds */ U_CAPI const char* U_EXPORT2 ucnv_getAvailableName (int32_t n) { if (0 <= n && n <= 0xffff) { UErrorCode err = U_ZERO_ERROR; const char *name = ucnv_bld_getAvailableConverter((uint16_t)n, &err); if (U_SUCCESS(err)) { return name; } } return nullptr; } U_CAPI int32_t U_EXPORT2 ucnv_countAvailable () { UErrorCode err = U_ZERO_ERROR; return ucnv_bld_countAvailableConverters(&err); } U_CAPI void U_EXPORT2 ucnv_getSubstChars (const UConverter * converter, char *mySubChar, int8_t * len, UErrorCode * err) { if (U_FAILURE (*err)) return; if (converter->subCharLen <= 0) { /* Unicode string or empty string from ucnv_setSubstString(). */ *len = 0; return; } if (*len < converter->subCharLen) /*not enough space in subChars */ { *err = U_INDEX_OUTOFBOUNDS_ERROR; return; } uprv_memcpy (mySubChar, converter->subChars, converter->subCharLen); /*fills in the subchars */ *len = converter->subCharLen; /*store # of bytes copied to buffer */ } U_CAPI void U_EXPORT2 ucnv_setSubstChars (UConverter * converter, const char *mySubChar, int8_t len, UErrorCode * err) { if (U_FAILURE (*err)) return; /*Makes sure that the subChar is within the codepages char length boundaries */ if ((len > converter->sharedData->staticData->maxBytesPerChar) || (len < converter->sharedData->staticData->minBytesPerChar)) { *err = U_ILLEGAL_ARGUMENT_ERROR; return; } uprv_memcpy (converter->subChars, mySubChar, len); /*copies the subchars */ converter->subCharLen = len; /*sets the new len */ /* * There is currently (2001Feb) no separate API to set/get subChar1. * In order to always have subChar written after it is explicitly set, * we set subChar1 to 0. */ converter->subChar1 = 0; } U_CAPI void U_EXPORT2 ucnv_setSubstString(UConverter *cnv, const char16_t *s, int32_t length, UErrorCode *err) { alignas(UConverter) char cloneBuffer[U_CNV_SAFECLONE_BUFFERSIZE]; char chars[UCNV_ERROR_BUFFER_LENGTH]; UConverter *clone; uint8_t *subChars; int32_t cloneSize, length8; /* Let the following functions check all arguments. */ cloneSize = sizeof(cloneBuffer); clone = ucnv_safeClone(cnv, cloneBuffer, &cloneSize, err); ucnv_setFromUCallBack(clone, UCNV_FROM_U_CALLBACK_STOP, nullptr, nullptr, nullptr, err); length8 = ucnv_fromUChars(clone, chars, (int32_t)sizeof(chars), s, length, err); ucnv_close(clone); if (U_FAILURE(*err)) { return; } if (cnv->sharedData->impl->writeSub == nullptr #if !UCONFIG_NO_LEGACY_CONVERSION || (cnv->sharedData->staticData->conversionType == UCNV_MBCS && ucnv_MBCSGetType(cnv) != UCNV_EBCDIC_STATEFUL) #endif ) { /* The converter is not stateful. Store the charset bytes as a fixed string. */ subChars = (uint8_t *)chars; } else { /* * The converter has a non-default writeSub() function, indicating * that it is stateful. * Store the Unicode string for on-the-fly conversion for correct * state handling. */ if (length > UCNV_ERROR_BUFFER_LENGTH) { /* * Should not occur. The converter should output at least one byte * per char16_t, which means that ucnv_fromUChars() should catch all * overflows. */ *err = U_BUFFER_OVERFLOW_ERROR; return; } subChars = (uint8_t *)s; if (length < 0) { length = u_strlen(s); } length8 = length * U_SIZEOF_UCHAR; } /* * For storing the substitution string, select either the small buffer inside * UConverter or allocate a subChars buffer. */ if (length8 > UCNV_MAX_SUBCHAR_LEN) { /* Use a separate buffer for the string. Outside UConverter to not make it too large. */ if (cnv->subChars == (uint8_t *)cnv->subUChars) { /* Allocate a new buffer for the string. */ cnv->subChars = (uint8_t *)uprv_malloc(UCNV_ERROR_BUFFER_LENGTH * U_SIZEOF_UCHAR); if (cnv->subChars == nullptr) { cnv->subChars = (uint8_t *)cnv->subUChars; *err = U_MEMORY_ALLOCATION_ERROR; return; } uprv_memset(cnv->subChars, 0, UCNV_ERROR_BUFFER_LENGTH * U_SIZEOF_UCHAR); } } /* Copy the substitution string into the UConverter or its subChars buffer. */ if (length8 == 0) { cnv->subCharLen = 0; } else { uprv_memcpy(cnv->subChars, subChars, length8); if (subChars == (uint8_t *)chars) { cnv->subCharLen = (int8_t)length8; } else /* subChars == s */ { cnv->subCharLen = (int8_t)-length; } } /* See comment in ucnv_setSubstChars(). */ cnv->subChar1 = 0; } /*resets the internal states of a converter *goal : have the same behaviour than a freshly created converter */ static void _reset(UConverter *converter, UConverterResetChoice choice, UBool callCallback) { if(converter == nullptr) { return; } if(callCallback) { /* first, notify the callback functions that the converter is reset */ UErrorCode errorCode; if(choice<=UCNV_RESET_TO_UNICODE && converter->fromCharErrorBehaviour != UCNV_TO_U_DEFAULT_CALLBACK) { UConverterToUnicodeArgs toUArgs = { sizeof(UConverterToUnicodeArgs), true, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr }; toUArgs.converter = converter; errorCode = U_ZERO_ERROR; converter->fromCharErrorBehaviour(converter->toUContext, &toUArgs, nullptr, 0, UCNV_RESET, &errorCode); } if(choice!=UCNV_RESET_TO_UNICODE && converter->fromUCharErrorBehaviour != UCNV_FROM_U_DEFAULT_CALLBACK) { UConverterFromUnicodeArgs fromUArgs = { sizeof(UConverterFromUnicodeArgs), true, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr }; fromUArgs.converter = converter; errorCode = U_ZERO_ERROR; converter->fromUCharErrorBehaviour(converter->fromUContext, &fromUArgs, nullptr, 0, 0, UCNV_RESET, &errorCode); } } /* now reset the converter itself */ if(choice<=UCNV_RESET_TO_UNICODE) { converter->toUnicodeStatus = converter->sharedData->toUnicodeStatus; converter->mode = 0; converter->toULength = 0; converter->invalidCharLength = converter->UCharErrorBufferLength = 0; converter->preToULength = 0; } if(choice!=UCNV_RESET_TO_UNICODE) { converter->fromUnicodeStatus = 0; converter->fromUChar32 = 0; converter->invalidUCharLength = converter->charErrorBufferLength = 0; converter->preFromUFirstCP = U_SENTINEL; converter->preFromULength = 0; } if (converter->sharedData->impl->reset != nullptr) { /* call the custom reset function */ converter->sharedData->impl->reset(converter, choice); } } U_CAPI void U_EXPORT2 ucnv_reset(UConverter *converter) { _reset(converter, UCNV_RESET_BOTH, true); } U_CAPI void U_EXPORT2 ucnv_resetToUnicode(UConverter *converter) { _reset(converter, UCNV_RESET_TO_UNICODE, true); } U_CAPI void U_EXPORT2 ucnv_resetFromUnicode(UConverter *converter) { _reset(converter, UCNV_RESET_FROM_UNICODE, true); } U_CAPI int8_t U_EXPORT2 ucnv_getMaxCharSize (const UConverter * converter) { return converter->maxBytesPerUChar; } U_CAPI int8_t U_EXPORT2 ucnv_getMinCharSize (const UConverter * converter) { return converter->sharedData->staticData->minBytesPerChar; } U_CAPI const char* U_EXPORT2 ucnv_getName (const UConverter * converter, UErrorCode * err) { if (U_FAILURE (*err)) return nullptr; if(converter->sharedData->impl->getName){ const char* temp= converter->sharedData->impl->getName(converter); if(temp) return temp; } return converter->sharedData->staticData->name; } U_CAPI int32_t U_EXPORT2 ucnv_getCCSID(const UConverter * converter, UErrorCode * err) { int32_t ccsid; if (U_FAILURE (*err)) return -1; ccsid = converter->sharedData->staticData->codepage; if (ccsid == 0) { /* Rare case. This is for cases like gb18030, which doesn't have an IBM canonical name, but does have an IBM alias. */ const char *standardName = ucnv_getStandardName(ucnv_getName(converter, err), "IBM", err); if (U_SUCCESS(*err) && standardName) { const char *ccsidStr = uprv_strchr(standardName, '-'); if (ccsidStr) { ccsid = (int32_t)atol(ccsidStr+1); /* +1 to skip '-' */ } } } return ccsid; } U_CAPI UConverterPlatform U_EXPORT2 ucnv_getPlatform (const UConverter * converter, UErrorCode * err) { if (U_FAILURE (*err)) return UCNV_UNKNOWN; return (UConverterPlatform)converter->sharedData->staticData->platform; } U_CAPI void U_EXPORT2 ucnv_getToUCallBack (const UConverter * converter, UConverterToUCallback *action, const void **context) { *action = converter->fromCharErrorBehaviour; *context = converter->toUContext; } U_CAPI void U_EXPORT2 ucnv_getFromUCallBack (const UConverter * converter, UConverterFromUCallback *action, const void **context) { *action = converter->fromUCharErrorBehaviour; *context = converter->fromUContext; } U_CAPI void U_EXPORT2 ucnv_setToUCallBack (UConverter * converter, UConverterToUCallback newAction, const void* newContext, UConverterToUCallback *oldAction, const void** oldContext, UErrorCode * err) { if (U_FAILURE (*err)) return; if (oldAction) *oldAction = converter->fromCharErrorBehaviour; converter->fromCharErrorBehaviour = newAction; if (oldContext) *oldContext = converter->toUContext; converter->toUContext = newContext; } U_CAPI void U_EXPORT2 ucnv_setFromUCallBack (UConverter * converter, UConverterFromUCallback newAction, const void* newContext, UConverterFromUCallback *oldAction, const void** oldContext, UErrorCode * err) { if (U_FAILURE (*err)) return; if (oldAction) *oldAction = converter->fromUCharErrorBehaviour; converter->fromUCharErrorBehaviour = newAction; if (oldContext) *oldContext = converter->fromUContext; converter->fromUContext = newContext; } static void _updateOffsets(int32_t *offsets, int32_t length, int32_t sourceIndex, int32_t errorInputLength) { int32_t *limit; int32_t delta, offset; if(sourceIndex>=0) { /* * adjust each offset by adding the previous sourceIndex * minus the length of the input sequence that caused an * error, if any */ delta=sourceIndex-errorInputLength; } else { /* * set each offset to -1 because this conversion function * does not handle offsets */ delta=-1; } limit=offsets+length; if(delta==0) { /* most common case, nothing to do */ } else if(delta>0) { /* add the delta to each offset (but not if the offset is <0) */ while(offsets<limit) { offset=*offsets; if(offset>=0) { *offsets=offset+delta; } ++offsets; } } else /* delta<0 */ { /* * set each offset to -1 because this conversion function * does not handle offsets * or the error input sequence started in a previous buffer */ while(offsets<limit) { *offsets++=-1; } } } /* ucnv_fromUnicode --------------------------------------------------------- */ /* * Implementation note for m:n conversions * * While collecting source units to find the longest match for m:n conversion, * some source units may need to be stored for a partial match. * When a second buffer does not yield a match on all of the previously stored * source units, then they must be "replayed", i.e., fed back into the converter. * * The code relies on the fact that replaying will not nest - * converting a replay buffer will not result in a replay. * This is because a replay is necessary only after the _continuation_ of a * partial match failed, but a replay buffer is converted as a whole. * It may result in some of its units being stored again for a partial match, * but there will not be a continuation _during_ the replay which could fail. * * It is conceivable that a callback function could call the converter * recursively in a way that causes another replay to be stored, but that * would be an error in the callback function. * Such violations will cause assertion failures in a debug build, * and wrong output, but they will not cause a crash. */ static void _fromUnicodeWithCallback(UConverterFromUnicodeArgs *pArgs, UErrorCode *err) { UConverterFromUnicode fromUnicode; UConverter *cnv; const char16_t *s; char *t; int32_t *offsets; int32_t sourceIndex; int32_t errorInputLength; UBool converterSawEndOfInput, calledCallback; /* variables for m:n conversion */ char16_t replay[UCNV_EXT_MAX_UCHARS]; const char16_t *realSource, *realSourceLimit; int32_t realSourceIndex; UBool realFlush; cnv=pArgs->converter; s=pArgs->source; t=pArgs->target; offsets=pArgs->offsets; /* get the converter implementation function */ sourceIndex=0; if(offsets==nullptr) { fromUnicode=cnv->sharedData->impl->fromUnicode; } else { fromUnicode=cnv->sharedData->impl->fromUnicodeWithOffsets; if(fromUnicode==nullptr) { /* there is no WithOffsets implementation */ fromUnicode=cnv->sharedData->impl->fromUnicode; /* we will write -1 for each offset */ sourceIndex=-1; } } if(cnv->preFromULength>=0) { /* normal mode */ realSource=nullptr; /* avoid compiler warnings - not otherwise necessary, and the values do not matter */ realSourceLimit=nullptr; realFlush=false; realSourceIndex=0; } else { /* * Previous m:n conversion stored source units from a partial match * and failed to consume all of them. * We need to "replay" them from a temporary buffer and convert them first. */ realSource=pArgs->source; realSourceLimit=pArgs->sourceLimit; realFlush=pArgs->flush; realSourceIndex=sourceIndex; uprv_memcpy(replay, cnv->preFromU, -cnv->preFromULength*U_SIZEOF_UCHAR); pArgs->source=replay; pArgs->sourceLimit=replay-cnv->preFromULength; pArgs->flush=false; sourceIndex=-1; cnv->preFromULength=0; } /* * loop for conversion and error handling * * loop { * convert * loop { * update offsets * handle end of input * handle errors/call callback * } * } */ for(;;) { if(U_SUCCESS(*err)) { /* convert */ fromUnicode(pArgs, err); /* * set a flag for whether the converter * successfully processed the end of the input * * need not check cnv->preFromULength==0 because a replay (<0) will cause * s<sourceLimit before converterSawEndOfInput is checked */ converterSawEndOfInput= (UBool)(U_SUCCESS(*err) && pArgs->flush && pArgs->source==pArgs->sourceLimit && cnv->fromUChar32==0); } else { /* handle error from ucnv_convertEx() */ converterSawEndOfInput=false; } /* no callback called yet for this iteration */ calledCallback=false; /* no sourceIndex adjustment for conversion, only for callback output */ errorInputLength=0; /* * loop for offsets and error handling * * iterates at most 3 times: * 1. to clean up after the conversion function * 2. after the callback * 3. after the callback again if there was truncated input */ for(;;) { /* update offsets if we write any */ if(offsets!=nullptr) { int32_t length=(int32_t)(pArgs->target-t); if(length>0) { _updateOffsets(offsets, length, sourceIndex, errorInputLength); /* * if a converter handles offsets and updates the offsets * pointer at the end, then pArgs->offset should not change * here; * however, some converters do not handle offsets at all * (sourceIndex<0) or may not update the offsets pointer */ pArgs->offsets=offsets+=length; } if(sourceIndex>=0) { sourceIndex+=(int32_t)(pArgs->source-s); } } if(cnv->preFromULength<0) { /* * switch the source to new replay units (cannot occur while replaying) * after offset handling and before end-of-input and callback handling */ if(realSource==nullptr) { realSource=pArgs->source; realSourceLimit=pArgs->sourceLimit; realFlush=pArgs->flush; realSourceIndex=sourceIndex; uprv_memcpy(replay, cnv->preFromU, -cnv->preFromULength*U_SIZEOF_UCHAR); pArgs->source=replay; pArgs->sourceLimit=replay-cnv->preFromULength; pArgs->flush=false; if((sourceIndex+=cnv->preFromULength)<0) { sourceIndex=-1; } cnv->preFromULength=0; } else { /* see implementation note before _fromUnicodeWithCallback() */ U_ASSERT(realSource==nullptr); *err=U_INTERNAL_PROGRAM_ERROR; } } /* update pointers */ s=pArgs->source; t=pArgs->target; if(U_SUCCESS(*err)) { if(s<pArgs->sourceLimit) { /* * continue with the conversion loop while there is still input left * (continue converting by breaking out of only the inner loop) */ break; } else if(realSource!=nullptr) { /* switch back from replaying to the real source and continue */ pArgs->source=realSource; pArgs->sourceLimit=realSourceLimit; pArgs->flush=realFlush; sourceIndex=realSourceIndex; realSource=nullptr; break; } else if(pArgs->flush && cnv->fromUChar32!=0) { /* * the entire input stream is consumed * and there is a partial, truncated input sequence left */ /* inject an error and continue with callback handling */ *err=U_TRUNCATED_CHAR_FOUND; calledCallback=false; /* new error condition */ } else { /* input consumed */ if(pArgs->flush) { /* * return to the conversion loop once more if the flush * flag is set and the conversion function has not * successfully processed the end of the input yet * * (continue converting by breaking out of only the inner loop) */ if(!converterSawEndOfInput) { break; } /* reset the converter without calling the callback function */ _reset(cnv, UCNV_RESET_FROM_UNICODE, false); } /* done successfully */ return; } } /* U_FAILURE(*err) */ { UErrorCode e; if( calledCallback || (e=*err)==U_BUFFER_OVERFLOW_ERROR || (e!=U_INVALID_CHAR_FOUND && e!=U_ILLEGAL_CHAR_FOUND && e!=U_TRUNCATED_CHAR_FOUND) ) { /* * the callback did not or cannot resolve the error: * set output pointers and return * * the check for buffer overflow is redundant but it is * a high-runner case and hopefully documents the intent * well * * if we were replaying, then the replay buffer must be * copied back into the UConverter * and the real arguments must be restored */ if(realSource!=nullptr) { int32_t length; U_ASSERT(cnv->preFromULength==0); length=(int32_t)(pArgs->sourceLimit-pArgs->source); if(length>0) { u_memcpy(cnv->preFromU, pArgs->source, length); cnv->preFromULength=(int8_t)-length; } pArgs->source=realSource; pArgs->sourceLimit=realSourceLimit; pArgs->flush=realFlush; } return; } } /* callback handling */ { UChar32 codePoint; /* get and write the code point */ codePoint=cnv->fromUChar32; errorInputLength=0; U16_APPEND_UNSAFE(cnv->invalidUCharBuffer, errorInputLength, codePoint); cnv->invalidUCharLength=(int8_t)errorInputLength; /* set the converter state to deal with the next character */ cnv->fromUChar32=0; /* call the callback function */ cnv->fromUCharErrorBehaviour(cnv->fromUContext, pArgs, cnv->invalidUCharBuffer, errorInputLength, codePoint, *err==U_INVALID_CHAR_FOUND ? UCNV_UNASSIGNED : UCNV_ILLEGAL, err); } /* * loop back to the offset handling * * this flag will indicate after offset handling * that a callback was called; * if the callback did not resolve the error, then we return */ calledCallback=true; } } } /* * Output the fromUnicode overflow buffer. * Call this function if(cnv->charErrorBufferLength>0). * @return true if overflow */ static UBool ucnv_outputOverflowFromUnicode(UConverter *cnv, char **target, const char *targetLimit, int32_t **pOffsets, UErrorCode *err) { int32_t *offsets; char *overflow, *t; int32_t i, length; t=*target; if(pOffsets!=nullptr) { offsets=*pOffsets; } else { offsets=nullptr; } overflow=(char *)cnv->charErrorBuffer; length=cnv->charErrorBufferLength; i=0; while(i<length) { if(t==targetLimit) { /* the overflow buffer contains too much, keep the rest */ int32_t j=0; do { overflow[j++]=overflow[i++]; } while(i<length); cnv->charErrorBufferLength=(int8_t)j; *target=t; if(offsets!=nullptr) { *pOffsets=offsets; } *err=U_BUFFER_OVERFLOW_ERROR; return true; } /* copy the overflow contents to the target */ *t++=overflow[i++]; if(offsets!=nullptr) { *offsets++=-1; /* no source index available for old output */ } } /* the overflow buffer is completely copied to the target */ cnv->charErrorBufferLength=0; *target=t; if(offsets!=nullptr) { *pOffsets=offsets; } return false; } U_CAPI void U_EXPORT2 ucnv_fromUnicode(UConverter *cnv, char **target, const char *targetLimit, const char16_t **source, const char16_t *sourceLimit, int32_t *offsets, UBool flush, UErrorCode *err) { UConverterFromUnicodeArgs args; const char16_t *s; char *t; /* check parameters */ if(err==nullptr || U_FAILURE(*err)) { return; } if(cnv==nullptr || target==nullptr || source==nullptr) { *err=U_ILLEGAL_ARGUMENT_ERROR; return; } s=*source; t=*target; if ((const void *)U_MAX_PTR(sourceLimit) == (const void *)sourceLimit) { /* Prevent code from going into an infinite loop in case we do hit this limit. The limit pointer is expected to be on a char16_t * boundary. This also prevents the next argument check from failing. */ sourceLimit = (const char16_t *)(((const char *)sourceLimit) - 1); } /* * All these conditions should never happen. * * 1) Make sure that the limits are >= to the address source or target * * 2) Make sure that the buffer sizes do not exceed the number range for * int32_t because some functions use the size (in units or bytes) * rather than comparing pointers, and because offsets are int32_t values. * * size_t is guaranteed to be unsigned and large enough for the job. * * Return with an error instead of adjusting the limits because we would * not be able to maintain the semantics that either the source must be * consumed or the target filled (unless an error occurs). * An adjustment would be targetLimit=t+0x7fffffff; for example. * * 3) Make sure that the user didn't incorrectly cast a char16_t * pointer * to a char * pointer and provide an incomplete char16_t code unit. */ if (sourceLimit<s || targetLimit<t || ((size_t)(sourceLimit-s)>(size_t)0x3fffffff && sourceLimit>s) || ((size_t)(targetLimit-t)>(size_t)0x7fffffff && targetLimit>t) || (((const char *)sourceLimit-(const char *)s) & 1) != 0) { *err=U_ILLEGAL_ARGUMENT_ERROR; return; } /* output the target overflow buffer */ if( cnv->charErrorBufferLength>0 && ucnv_outputOverflowFromUnicode(cnv, target, targetLimit, &offsets, err) ) { /* U_BUFFER_OVERFLOW_ERROR */ return; } /* *target may have moved, therefore stop using t */ if(!flush && s==sourceLimit && cnv->preFromULength>=0) { /* the overflow buffer is emptied and there is no new input: we are done */ return; } /* * Do not simply return with a buffer overflow error if * !flush && t==targetLimit * because it is possible that the source will not generate any output. * For example, the skip callback may be called; * it does not output anything. */ /* prepare the converter arguments */ args.converter=cnv; args.flush=flush; args.offsets=offsets; args.source=s; args.sourceLimit=sourceLimit; args.target=*target; args.targetLimit=targetLimit; args.size=sizeof(args); _fromUnicodeWithCallback(&args, err); *source=args.source; *target=args.target; } /* ucnv_toUnicode() --------------------------------------------------------- */ static void _toUnicodeWithCallback(UConverterToUnicodeArgs *pArgs, UErrorCode *err) { UConverterToUnicode toUnicode; UConverter *cnv; const char *s; char16_t *t; int32_t *offsets; int32_t sourceIndex; int32_t errorInputLength; UBool converterSawEndOfInput, calledCallback; /* variables for m:n conversion */ char replay[UCNV_EXT_MAX_BYTES]; const char *realSource, *realSourceLimit; int32_t realSourceIndex; UBool realFlush; cnv=pArgs->converter; s=pArgs->source; t=pArgs->target; offsets=pArgs->offsets; /* get the converter implementation function */ sourceIndex=0; if(offsets==nullptr) { toUnicode=cnv->sharedData->impl->toUnicode; } else { toUnicode=cnv->sharedData->impl->toUnicodeWithOffsets; if(toUnicode==nullptr) { /* there is no WithOffsets implementation */ toUnicode=cnv->sharedData->impl->toUnicode; /* we will write -1 for each offset */ sourceIndex=-1; } } if(cnv->preToULength>=0) { /* normal mode */ realSource=nullptr; /* avoid compiler warnings - not otherwise necessary, and the values do not matter */ realSourceLimit=nullptr; realFlush=false; realSourceIndex=0; } else { /* * Previous m:n conversion stored source units from a partial match * and failed to consume all of them. * We need to "replay" them from a temporary buffer and convert them first. */ realSource=pArgs->source; realSourceLimit=pArgs->sourceLimit; realFlush=pArgs->flush; realSourceIndex=sourceIndex; uprv_memcpy(replay, cnv->preToU, -cnv->preToULength); pArgs->source=replay; pArgs->sourceLimit=replay-cnv->preToULength; pArgs->flush=false; sourceIndex=-1; cnv->preToULength=0; } /* * loop for conversion and error handling * * loop { * convert * loop { * update offsets * handle end of input * handle errors/call callback * } * } */ for(;;) { if(U_SUCCESS(*err)) { /* convert */ toUnicode(pArgs, err); /* * set a flag for whether the converter * successfully processed the end of the input * * need not check cnv->preToULength==0 because a replay (<0) will cause * s<sourceLimit before converterSawEndOfInput is checked */ converterSawEndOfInput= (UBool)(U_SUCCESS(*err) && pArgs->flush && pArgs->source==pArgs->sourceLimit && cnv->toULength==0); } else { /* handle error from getNextUChar() or ucnv_convertEx() */ converterSawEndOfInput=false; } /* no callback called yet for this iteration */ calledCallback=false; /* no sourceIndex adjustment for conversion, only for callback output */ errorInputLength=0; /* * loop for offsets and error handling * * iterates at most 3 times: * 1. to clean up after the conversion function * 2. after the callback * 3. after the callback again if there was truncated input */ for(;;) { /* update offsets if we write any */ if(offsets!=nullptr) { int32_t length=(int32_t)(pArgs->target-t); if(length>0) { _updateOffsets(offsets, length, sourceIndex, errorInputLength); /* * if a converter handles offsets and updates the offsets * pointer at the end, then pArgs->offset should not change * here; * however, some converters do not handle offsets at all * (sourceIndex<0) or may not update the offsets pointer */ pArgs->offsets=offsets+=length; } if(sourceIndex>=0) { sourceIndex+=(int32_t)(pArgs->source-s); } } if(cnv->preToULength<0) { /* * switch the source to new replay units (cannot occur while replaying) * after offset handling and before end-of-input and callback handling */ if(realSource==nullptr) { realSource=pArgs->source; realSourceLimit=pArgs->sourceLimit; realFlush=pArgs->flush; realSourceIndex=sourceIndex; uprv_memcpy(replay, cnv->preToU, -cnv->preToULength); pArgs->source=replay; pArgs->sourceLimit=replay-cnv->preToULength; pArgs->flush=false; if((sourceIndex+=cnv->preToULength)<0) { sourceIndex=-1; } cnv->preToULength=0; } else { /* see implementation note before _fromUnicodeWithCallback() */ U_ASSERT(realSource==nullptr); *err=U_INTERNAL_PROGRAM_ERROR; } } /* update pointers */ s=pArgs->source; t=pArgs->target; if(U_SUCCESS(*err)) { if(s<pArgs->sourceLimit) { /* * continue with the conversion loop while there is still input left * (continue converting by breaking out of only the inner loop) */ break; } else if(realSource!=nullptr) { /* switch back from replaying to the real source and continue */ pArgs->source=realSource; pArgs->sourceLimit=realSourceLimit; pArgs->flush=realFlush; sourceIndex=realSourceIndex; realSource=nullptr; break; } else if(pArgs->flush && cnv->toULength>0) { /* * the entire input stream is consumed * and there is a partial, truncated input sequence left */ /* inject an error and continue with callback handling */ *err=U_TRUNCATED_CHAR_FOUND; calledCallback=false; /* new error condition */ } else { /* input consumed */ if(pArgs->flush) { /* * return to the conversion loop once more if the flush * flag is set and the conversion function has not * successfully processed the end of the input yet * * (continue converting by breaking out of only the inner loop) */ if(!converterSawEndOfInput) { break; } /* reset the converter without calling the callback function */ _reset(cnv, UCNV_RESET_TO_UNICODE, false); } /* done successfully */ return; } } /* U_FAILURE(*err) */ { UErrorCode e; if( calledCallback || (e=*err)==U_BUFFER_OVERFLOW_ERROR || (e!=U_INVALID_CHAR_FOUND && e!=U_ILLEGAL_CHAR_FOUND && e!=U_TRUNCATED_CHAR_FOUND && e!=U_ILLEGAL_ESCAPE_SEQUENCE && e!=U_UNSUPPORTED_ESCAPE_SEQUENCE) ) { /* * the callback did not or cannot resolve the error: * set output pointers and return * * the check for buffer overflow is redundant but it is * a high-runner case and hopefully documents the intent * well * * if we were replaying, then the replay buffer must be * copied back into the UConverter * and the real arguments must be restored */ if(realSource!=nullptr) { int32_t length; U_ASSERT(cnv->preToULength==0); length=(int32_t)(pArgs->sourceLimit-pArgs->source); if(length>0) { uprv_memcpy(cnv->preToU, pArgs->source, length); cnv->preToULength=(int8_t)-length; } pArgs->source=realSource; pArgs->sourceLimit=realSourceLimit; pArgs->flush=realFlush; } return; } } /* copy toUBytes[] to invalidCharBuffer[] */ errorInputLength=cnv->invalidCharLength=cnv->toULength; if(errorInputLength>0) { uprv_memcpy(cnv->invalidCharBuffer, cnv->toUBytes, errorInputLength); } /* set the converter state to deal with the next character */ cnv->toULength=0; /* call the callback function */ if(cnv->toUCallbackReason==UCNV_ILLEGAL && *err==U_INVALID_CHAR_FOUND) { cnv->toUCallbackReason = UCNV_UNASSIGNED; } cnv->fromCharErrorBehaviour(cnv->toUContext, pArgs, cnv->invalidCharBuffer, errorInputLength, cnv->toUCallbackReason, err); cnv->toUCallbackReason = UCNV_ILLEGAL; /* reset to default value */ /* * loop back to the offset handling * * this flag will indicate after offset handling * that a callback was called; * if the callback did not resolve the error, then we return */ calledCallback=true; } } } /* * Output the toUnicode overflow buffer. * Call this function if(cnv->UCharErrorBufferLength>0). * @return true if overflow */ static UBool ucnv_outputOverflowToUnicode(UConverter *cnv, char16_t **target, const char16_t *targetLimit, int32_t **pOffsets, UErrorCode *err) { int32_t *offsets; char16_t *overflow, *t; int32_t i, length; t=*target; if(pOffsets!=nullptr) { offsets=*pOffsets; } else { offsets=nullptr; } overflow=cnv->UCharErrorBuffer; length=cnv->UCharErrorBufferLength; i=0; while(i<length) { if(t==targetLimit) { /* the overflow buffer contains too much, keep the rest */ int32_t j=0; do { overflow[j++]=overflow[i++]; } while(i<length); cnv->UCharErrorBufferLength=(int8_t)j; *target=t; if(offsets!=nullptr) { *pOffsets=offsets; } *err=U_BUFFER_OVERFLOW_ERROR; return true; } /* copy the overflow contents to the target */ *t++=overflow[i++]; if(offsets!=nullptr) { *offsets++=-1; /* no source index available for old output */ } } /* the overflow buffer is completely copied to the target */ cnv->UCharErrorBufferLength=0; *target=t; if(offsets!=nullptr) { *pOffsets=offsets; } return false; } U_CAPI void U_EXPORT2 ucnv_toUnicode(UConverter *cnv, char16_t **target, const char16_t *targetLimit, const char **source, const char *sourceLimit, int32_t *offsets, UBool flush, UErrorCode *err) { UConverterToUnicodeArgs args; const char *s; char16_t *t; /* check parameters */ if(err==nullptr || U_FAILURE(*err)) { return; } if(cnv==nullptr || target==nullptr || source==nullptr) { *err=U_ILLEGAL_ARGUMENT_ERROR; return; } s=*source; t=*target; if ((const void *)U_MAX_PTR(targetLimit) == (const void *)targetLimit) { /* Prevent code from going into an infinite loop in case we do hit this limit. The limit pointer is expected to be on a char16_t * boundary. This also prevents the next argument check from failing. */ targetLimit = (const char16_t *)(((const char *)targetLimit) - 1); } /* * All these conditions should never happen. * * 1) Make sure that the limits are >= to the address source or target * * 2) Make sure that the buffer sizes do not exceed the number range for * int32_t because some functions use the size (in units or bytes) * rather than comparing pointers, and because offsets are int32_t values. * * size_t is guaranteed to be unsigned and large enough for the job. * * Return with an error instead of adjusting the limits because we would * not be able to maintain the semantics that either the source must be * consumed or the target filled (unless an error occurs). * An adjustment would be sourceLimit=t+0x7fffffff; for example. * * 3) Make sure that the user didn't incorrectly cast a char16_t * pointer * to a char * pointer and provide an incomplete char16_t code unit. */ if (sourceLimit<s || targetLimit<t || ((size_t)(sourceLimit-s)>(size_t)0x7fffffff && sourceLimit>s) || ((size_t)(targetLimit-t)>(size_t)0x3fffffff && targetLimit>t) || (((const char *)targetLimit-(const char *)t) & 1) != 0 ) { *err=U_ILLEGAL_ARGUMENT_ERROR; return; } /* output the target overflow buffer */ if( cnv->UCharErrorBufferLength>0 && ucnv_outputOverflowToUnicode(cnv, target, targetLimit, &offsets, err) ) { /* U_BUFFER_OVERFLOW_ERROR */ return; } /* *target may have moved, therefore stop using t */ if(!flush && s==sourceLimit && cnv->preToULength>=0) { /* the overflow buffer is emptied and there is no new input: we are done */ return; } /* * Do not simply return with a buffer overflow error if * !flush && t==targetLimit * because it is possible that the source will not generate any output. * For example, the skip callback may be called; * it does not output anything. */ /* prepare the converter arguments */ args.converter=cnv; args.flush=flush; args.offsets=offsets; args.source=s; args.sourceLimit=sourceLimit; args.target=*target; args.targetLimit=targetLimit; args.size=sizeof(args); _toUnicodeWithCallback(&args, err); *source=args.source; *target=args.target; } /* ucnv_to/fromUChars() ----------------------------------------------------- */ U_CAPI int32_t U_EXPORT2 ucnv_fromUChars(UConverter *cnv, char *dest, int32_t destCapacity, const char16_t *src, int32_t srcLength, UErrorCode *pErrorCode) { const char16_t *srcLimit; char *originalDest, *destLimit; int32_t destLength; /* check arguments */ if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) { return 0; } if( cnv==nullptr || destCapacity<0 || (destCapacity>0 && dest==nullptr) || srcLength<-1 || (srcLength!=0 && src==nullptr) ) { *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; return 0; } /* initialize */ ucnv_resetFromUnicode(cnv); originalDest=dest; if(srcLength==-1) { srcLength=u_strlen(src); } if(srcLength>0) { srcLimit=src+srcLength; destCapacity=pinCapacity(dest, destCapacity); destLimit=dest+destCapacity; /* perform the conversion */ ucnv_fromUnicode(cnv, &dest, destLimit, &src, srcLimit, nullptr, true, pErrorCode); destLength=(int32_t)(dest-originalDest); /* if an overflow occurs, then get the preflighting length */ if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) { char buffer[1024]; destLimit=buffer+sizeof(buffer); do { dest=buffer; *pErrorCode=U_ZERO_ERROR; ucnv_fromUnicode(cnv, &dest, destLimit, &src, srcLimit, nullptr, true, pErrorCode); destLength+=(int32_t)(dest-buffer); } while(*pErrorCode==U_BUFFER_OVERFLOW_ERROR); } } else { destLength=0; } return u_terminateChars(originalDest, destCapacity, destLength, pErrorCode); } U_CAPI int32_t U_EXPORT2 ucnv_toUChars(UConverter *cnv, char16_t *dest, int32_t destCapacity, const char *src, int32_t srcLength, UErrorCode *pErrorCode) { const char *srcLimit; char16_t *originalDest, *destLimit; int32_t destLength; /* check arguments */ if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) { return 0; } if( cnv==nullptr || destCapacity<0 || (destCapacity>0 && dest==nullptr) || srcLength<-1 || (srcLength!=0 && src==nullptr)) { *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; return 0; } /* initialize */ ucnv_resetToUnicode(cnv); originalDest=dest; if(srcLength==-1) { srcLength=(int32_t)uprv_strlen(src); } if(srcLength>0) { srcLimit=src+srcLength; destCapacity=pinCapacity(dest, destCapacity); destLimit=dest+destCapacity; /* perform the conversion */ ucnv_toUnicode(cnv, &dest, destLimit, &src, srcLimit, nullptr, true, pErrorCode); destLength=(int32_t)(dest-originalDest); /* if an overflow occurs, then get the preflighting length */ if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) { char16_t buffer[1024]; destLimit=buffer+UPRV_LENGTHOF(buffer); do { dest=buffer; *pErrorCode=U_ZERO_ERROR; ucnv_toUnicode(cnv, &dest, destLimit, &src, srcLimit, nullptr, true, pErrorCode); destLength+=(int32_t)(dest-buffer); } while(*pErrorCode==U_BUFFER_OVERFLOW_ERROR); } } else { destLength=0; } return u_terminateUChars(originalDest, destCapacity, destLength, pErrorCode); } /* ucnv_getNextUChar() ------------------------------------------------------ */ U_CAPI UChar32 U_EXPORT2 ucnv_getNextUChar(UConverter *cnv, const char **source, const char *sourceLimit, UErrorCode *err) { UConverterToUnicodeArgs args; char16_t buffer[U16_MAX_LENGTH]; const char *s; UChar32 c; int32_t i, length; /* check parameters */ if(err==nullptr || U_FAILURE(*err)) { return 0xffff; } if(cnv==nullptr || source==nullptr) { *err=U_ILLEGAL_ARGUMENT_ERROR; return 0xffff; } s=*source; if(sourceLimit<s) { *err=U_ILLEGAL_ARGUMENT_ERROR; return 0xffff; } /* * Make sure that the buffer sizes do not exceed the number range for * int32_t because some functions use the size (in units or bytes) * rather than comparing pointers, and because offsets are int32_t values. * * size_t is guaranteed to be unsigned and large enough for the job. * * Return with an error instead of adjusting the limits because we would * not be able to maintain the semantics that either the source must be * consumed or the target filled (unless an error occurs). * An adjustment would be sourceLimit=t+0x7fffffff; for example. */ if(((size_t)(sourceLimit-s)>(size_t)0x7fffffff && sourceLimit>s)) { *err=U_ILLEGAL_ARGUMENT_ERROR; return 0xffff; } c=U_SENTINEL; /* flush the target overflow buffer */ if(cnv->UCharErrorBufferLength>0) { char16_t *overflow; overflow=cnv->UCharErrorBuffer; i=0; length=cnv->UCharErrorBufferLength; U16_NEXT(overflow, i, length, c); /* move the remaining overflow contents up to the beginning */ if((cnv->UCharErrorBufferLength=(int8_t)(length-i))>0) { uprv_memmove(cnv->UCharErrorBuffer, cnv->UCharErrorBuffer+i, cnv->UCharErrorBufferLength*U_SIZEOF_UCHAR); } if(!U16_IS_LEAD(c) || i<length) { return c; } /* * Continue if the overflow buffer contained only a lead surrogate, * in case the converter outputs single surrogates from complete * input sequences. */ } /* * flush==true is implied for ucnv_getNextUChar() * * do not simply return even if s==sourceLimit because the converter may * not have seen flush==true before */ /* prepare the converter arguments */ args.converter=cnv; args.flush=true; args.offsets=nullptr; args.source=s; args.sourceLimit=sourceLimit; args.target=buffer; args.targetLimit=buffer+1; args.size=sizeof(args); if(c<0) { /* * call the native getNextUChar() implementation if we are * at a character boundary (toULength==0) * * unlike with _toUnicode(), getNextUChar() implementations must set * U_TRUNCATED_CHAR_FOUND for truncated input, * in addition to setting toULength/toUBytes[] */ if(cnv->toULength==0 && cnv->sharedData->impl->getNextUChar!=nullptr) { c=cnv->sharedData->impl->getNextUChar(&args, err); *source=s=args.source; if(*err==U_INDEX_OUTOFBOUNDS_ERROR) { /* reset the converter without calling the callback function */ _reset(cnv, UCNV_RESET_TO_UNICODE, false); return 0xffff; /* no output */ } else if(U_SUCCESS(*err) && c>=0) { return c; /* * else fall through to use _toUnicode() because * UCNV_GET_NEXT_UCHAR_USE_TO_U: the native function did not want to handle it after all * U_FAILURE: call _toUnicode() for callback handling (do not output c) */ } } /* convert to one char16_t in buffer[0], or handle getNextUChar() errors */ _toUnicodeWithCallback(&args, err); if(*err==U_BUFFER_OVERFLOW_ERROR) { *err=U_ZERO_ERROR; } i=0; length=(int32_t)(args.target-buffer); } else { /* write the lead surrogate from the overflow buffer */ buffer[0]=(char16_t)c; args.target=buffer+1; i=0; length=1; } /* buffer contents starts at i and ends before length */ if(U_FAILURE(*err)) { c=0xffff; /* no output */ } else if(length==0) { /* no input or only state changes */ *err=U_INDEX_OUTOFBOUNDS_ERROR; /* no need to reset explicitly because _toUnicodeWithCallback() did it */ c=0xffff; /* no output */ } else { c=buffer[0]; i=1; if(!U16_IS_LEAD(c)) { /* consume c=buffer[0], done */ } else { /* got a lead surrogate, see if a trail surrogate follows */ char16_t c2; if(cnv->UCharErrorBufferLength>0) { /* got overflow output from the conversion */ if(U16_IS_TRAIL(c2=cnv->UCharErrorBuffer[0])) { /* got a trail surrogate, too */ c=U16_GET_SUPPLEMENTARY(c, c2); /* move the remaining overflow contents up to the beginning */ if((--cnv->UCharErrorBufferLength)>0) { uprv_memmove(cnv->UCharErrorBuffer, cnv->UCharErrorBuffer+1, cnv->UCharErrorBufferLength*U_SIZEOF_UCHAR); } } else { /* c is an unpaired lead surrogate, just return it */ } } else if(args.source<sourceLimit) { /* convert once more, to buffer[1] */ args.targetLimit=buffer+2; _toUnicodeWithCallback(&args, err); if(*err==U_BUFFER_OVERFLOW_ERROR) { *err=U_ZERO_ERROR; } length=(int32_t)(args.target-buffer); if(U_SUCCESS(*err) && length==2 && U16_IS_TRAIL(c2=buffer[1])) { /* got a trail surrogate, too */ c=U16_GET_SUPPLEMENTARY(c, c2); i=2; } } } } /* * move leftover output from buffer[i..length[ * into the beginning of the overflow buffer */ if(i<length) { /* move further overflow back */ int32_t delta=length-i; if((length=cnv->UCharErrorBufferLength)>0) { uprv_memmove(cnv->UCharErrorBuffer+delta, cnv->UCharErrorBuffer, length*U_SIZEOF_UCHAR); } cnv->UCharErrorBufferLength=(int8_t)(length+delta); cnv->UCharErrorBuffer[0]=buffer[i++]; if(delta>1) { cnv->UCharErrorBuffer[1]=buffer[i]; } } *source=args.source; return c; } /* ucnv_convert() and siblings ---------------------------------------------- */ U_CAPI void U_EXPORT2 ucnv_convertEx(UConverter *targetCnv, UConverter *sourceCnv, char **target, const char *targetLimit, const char **source, const char *sourceLimit, char16_t *pivotStart, char16_t **pivotSource, char16_t **pivotTarget, const char16_t *pivotLimit, UBool reset, UBool flush, UErrorCode *pErrorCode) { char16_t pivotBuffer[CHUNK_SIZE]; const char16_t *myPivotSource; char16_t *myPivotTarget; const char *s; char *t; UConverterToUnicodeArgs toUArgs; UConverterFromUnicodeArgs fromUArgs; UConverterConvert convert; /* error checking */ if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) { return; } if( targetCnv==nullptr || sourceCnv==nullptr || source==nullptr || *source==nullptr || target==nullptr || *target==nullptr || targetLimit==nullptr ) { *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; return; } s=*source; t=*target; if((sourceLimit!=nullptr && sourceLimit<s) || targetLimit<t) { *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; return; } /* * Make sure that the buffer sizes do not exceed the number range for * int32_t. See ucnv_toUnicode() for a more detailed comment. */ if( (sourceLimit!=nullptr && ((size_t)(sourceLimit-s)>(size_t)0x7fffffff && sourceLimit>s)) || ((size_t)(targetLimit-t)>(size_t)0x7fffffff && targetLimit>t) ) { *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; return; } if(pivotStart==nullptr) { if(!flush) { /* streaming conversion requires an explicit pivot buffer */ *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; return; } /* use the stack pivot buffer */ myPivotSource=myPivotTarget=pivotStart=pivotBuffer; pivotSource=(char16_t **)&myPivotSource; pivotTarget=&myPivotTarget; pivotLimit=pivotBuffer+CHUNK_SIZE; } else if( pivotStart>=pivotLimit || pivotSource==nullptr || *pivotSource==nullptr || pivotTarget==nullptr || *pivotTarget==nullptr || pivotLimit==nullptr ) { *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; return; } if(sourceLimit==nullptr) { /* get limit of single-byte-NUL-terminated source string */ sourceLimit=uprv_strchr(*source, 0); } if(reset) { ucnv_resetToUnicode(sourceCnv); ucnv_resetFromUnicode(targetCnv); *pivotSource=*pivotTarget=pivotStart; } else if(targetCnv->charErrorBufferLength>0) { /* output the targetCnv overflow buffer */ if(ucnv_outputOverflowFromUnicode(targetCnv, target, targetLimit, nullptr, pErrorCode)) { /* U_BUFFER_OVERFLOW_ERROR */ return; } /* *target has moved, therefore stop using t */ if( !flush && targetCnv->preFromULength>=0 && *pivotSource==*pivotTarget && sourceCnv->UCharErrorBufferLength==0 && sourceCnv->preToULength>=0 && s==sourceLimit ) { /* the fromUnicode overflow buffer is emptied and there is no new input: we are done */ return; } } /* Is direct-UTF-8 conversion available? */ if( sourceCnv->sharedData->staticData->conversionType==UCNV_UTF8 && targetCnv->sharedData->impl->fromUTF8!=nullptr ) { convert=targetCnv->sharedData->impl->fromUTF8; } else if( targetCnv->sharedData->staticData->conversionType==UCNV_UTF8 && sourceCnv->sharedData->impl->toUTF8!=nullptr ) { convert=sourceCnv->sharedData->impl->toUTF8; } else { convert=nullptr; } /* * If direct-UTF-8 conversion is available, then we use a smaller * pivot buffer for error handling and partial matches * so that we quickly return to direct conversion. * * 32 is large enough for UCNV_EXT_MAX_UCHARS and UCNV_ERROR_BUFFER_LENGTH. * * We could reduce the pivot buffer size further, at the cost of * buffer overflows from callbacks. * The pivot buffer should not be smaller than the maximum number of * fromUnicode extension table input UChars * (for m:n conversion, see * targetCnv->sharedData->mbcs.extIndexes[UCNV_EXT_COUNT_UCHARS]) * or 2 for surrogate pairs. * * Too small a buffer can cause thrashing between pivoting and direct * conversion, with function call overhead outweighing the benefits * of direct conversion. */ if(convert!=nullptr && (pivotLimit-pivotStart)>32) { pivotLimit=pivotStart+32; } /* prepare the converter arguments */ fromUArgs.converter=targetCnv; fromUArgs.flush=false; fromUArgs.offsets=nullptr; fromUArgs.target=*target; fromUArgs.targetLimit=targetLimit; fromUArgs.size=sizeof(fromUArgs); toUArgs.converter=sourceCnv; toUArgs.flush=flush; toUArgs.offsets=nullptr; toUArgs.source=s; toUArgs.sourceLimit=sourceLimit; toUArgs.targetLimit=pivotLimit; toUArgs.size=sizeof(toUArgs); /* * TODO: Consider separating this function into two functions, * extracting exactly the conversion loop, * for readability and to reduce the set of visible variables. * * Otherwise stop using s and t from here on. */ s=t=nullptr; /* * conversion loop * * The sequence of steps in the loop may appear backward, * but the principle is simple: * In the chain of * source - sourceCnv overflow - pivot - targetCnv overflow - target * empty out later buffers before refilling them from earlier ones. * * The targetCnv overflow buffer is flushed out only once before the loop. */ for(;;) { /* * if(pivot not empty or error or replay or flush fromUnicode) { * fromUnicode(pivot -> target); * } * * For pivoting conversion; and for direct conversion for * error callback handling and flushing the replay buffer. */ if( *pivotSource<*pivotTarget || U_FAILURE(*pErrorCode) || targetCnv->preFromULength<0 || fromUArgs.flush ) { fromUArgs.source=*pivotSource; fromUArgs.sourceLimit=*pivotTarget; _fromUnicodeWithCallback(&fromUArgs, pErrorCode); if(U_FAILURE(*pErrorCode)) { /* target overflow, or conversion error */ *pivotSource=(char16_t *)fromUArgs.source; break; } /* * _fromUnicodeWithCallback() must have consumed the pivot contents * (*pivotSource==*pivotTarget) since it returned with U_SUCCESS() */ } /* The pivot buffer is empty; reset it so we start at pivotStart. */ *pivotSource=*pivotTarget=pivotStart; /* * if(sourceCnv overflow buffer not empty) { * move(sourceCnv overflow buffer -> pivot); * continue; * } */ /* output the sourceCnv overflow buffer */ if(sourceCnv->UCharErrorBufferLength>0) { if(ucnv_outputOverflowToUnicode(sourceCnv, pivotTarget, pivotLimit, nullptr, pErrorCode)) { /* U_BUFFER_OVERFLOW_ERROR */ *pErrorCode=U_ZERO_ERROR; } continue; } /* * check for end of input and break if done * * Checking both flush and fromUArgs.flush ensures that the converters * have been called with the flush flag set if the ucnv_convertEx() * caller set it. */ if( toUArgs.source==sourceLimit && sourceCnv->preToULength>=0 && sourceCnv->toULength==0 && (!flush || fromUArgs.flush) ) { /* done successfully */ break; } /* * use direct conversion if available * but not if continuing a partial match * or flushing the toUnicode replay buffer */ if(convert!=nullptr && targetCnv->preFromUFirstCP<0 && sourceCnv->preToULength==0) { if(*pErrorCode==U_USING_DEFAULT_WARNING) { /* remove a warning that may be set by this function */ *pErrorCode=U_ZERO_ERROR; } convert(&fromUArgs, &toUArgs, pErrorCode); if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) { break; } else if(U_FAILURE(*pErrorCode)) { if(sourceCnv->toULength>0) { /* * Fall through to calling _toUnicodeWithCallback() * for callback handling. * * The pivot buffer will be reset with * *pivotSource=*pivotTarget=pivotStart; * which indicates a toUnicode error to the caller * (*pivotSource==pivotStart shows no pivot UChars consumed). */ } else { /* * Indicate a fromUnicode error to the caller * (*pivotSource>pivotStart shows some pivot UChars consumed). */ *pivotSource=*pivotTarget=pivotStart+1; /* * Loop around to calling _fromUnicodeWithCallbacks() * for callback handling. */ continue; } } else if(*pErrorCode==U_USING_DEFAULT_WARNING) { /* * No error, but the implementation requested to temporarily * fall back to pivoting. */ *pErrorCode=U_ZERO_ERROR; /* * The following else branches are almost identical to the end-of-input * handling in _toUnicodeWithCallback(). * Avoid calling it just for the end of input. */ } else if(flush && sourceCnv->toULength>0) { /* flush==toUArgs.flush */ /* * the entire input stream is consumed * and there is a partial, truncated input sequence left */ /* inject an error and continue with callback handling */ *pErrorCode=U_TRUNCATED_CHAR_FOUND; } else { /* input consumed */ if(flush) { /* reset the converters without calling the callback functions */ _reset(sourceCnv, UCNV_RESET_TO_UNICODE, false); _reset(targetCnv, UCNV_RESET_FROM_UNICODE, false); } /* done successfully */ break; } } /* * toUnicode(source -> pivot); * * For pivoting conversion; and for direct conversion for * error callback handling, continuing partial matches * and flushing the replay buffer. * * The pivot buffer is empty and reset. */ toUArgs.target=pivotStart; /* ==*pivotTarget */ /* toUArgs.targetLimit=pivotLimit; already set before the loop */ _toUnicodeWithCallback(&toUArgs, pErrorCode); *pivotTarget=toUArgs.target; if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) { /* pivot overflow: continue with the conversion loop */ *pErrorCode=U_ZERO_ERROR; } else if(U_FAILURE(*pErrorCode) || (!flush && *pivotTarget==pivotStart)) { /* conversion error, or there was nothing left to convert */ break; } /* * else: * _toUnicodeWithCallback() wrote into the pivot buffer, * continue with fromUnicode conversion. * * Set the fromUnicode flush flag if we flush and if toUnicode has * processed the end of the input. */ if( flush && toUArgs.source==sourceLimit && sourceCnv->preToULength>=0 && sourceCnv->UCharErrorBufferLength==0 ) { fromUArgs.flush=true; } } /* * The conversion loop is exited when one of the following is true: * - the entire source text has been converted successfully to the target buffer * - a target buffer overflow occurred * - a conversion error occurred */ *source=toUArgs.source; *target=fromUArgs.target; /* terminate the target buffer if possible */ if(flush && U_SUCCESS(*pErrorCode)) { if(*target!=targetLimit) { **target=0; if(*pErrorCode==U_STRING_NOT_TERMINATED_WARNING) { *pErrorCode=U_ZERO_ERROR; } } else { *pErrorCode=U_STRING_NOT_TERMINATED_WARNING; } } } /* internal implementation of ucnv_convert() etc. with preflighting */ static int32_t ucnv_internalConvert(UConverter *outConverter, UConverter *inConverter, char *target, int32_t targetCapacity, const char *source, int32_t sourceLength, UErrorCode *pErrorCode) { char16_t pivotBuffer[CHUNK_SIZE]; char16_t *pivot, *pivot2; char *myTarget; const char *sourceLimit; const char *targetLimit; int32_t targetLength=0; /* set up */ if(sourceLength<0) { sourceLimit=uprv_strchr(source, 0); } else { sourceLimit=source+sourceLength; } /* if there is no input data, we're done */ if(source==sourceLimit) { return u_terminateChars(target, targetCapacity, 0, pErrorCode); } pivot=pivot2=pivotBuffer; myTarget=target; targetLength=0; if(targetCapacity>0) { /* perform real conversion */ targetLimit=target+targetCapacity; ucnv_convertEx(outConverter, inConverter, &myTarget, targetLimit, &source, sourceLimit, pivotBuffer, &pivot, &pivot2, pivotBuffer+CHUNK_SIZE, false, true, pErrorCode); targetLength=(int32_t)(myTarget-target); } /* * If the output buffer is exhausted (or we are only "preflighting"), we need to stop writing * to it but continue the conversion in order to store in targetCapacity * the number of bytes that was required. */ if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR || targetCapacity==0) { char targetBuffer[CHUNK_SIZE]; targetLimit=targetBuffer+CHUNK_SIZE; do { *pErrorCode=U_ZERO_ERROR; myTarget=targetBuffer; ucnv_convertEx(outConverter, inConverter, &myTarget, targetLimit, &source, sourceLimit, pivotBuffer, &pivot, &pivot2, pivotBuffer+CHUNK_SIZE, false, true, pErrorCode); targetLength+=(int32_t)(myTarget-targetBuffer); } while(*pErrorCode==U_BUFFER_OVERFLOW_ERROR); /* done with preflighting, set warnings and errors as appropriate */ return u_terminateChars(target, targetCapacity, targetLength, pErrorCode); } /* no need to call u_terminateChars() because ucnv_convertEx() took care of that */ return targetLength; } U_CAPI int32_t U_EXPORT2 ucnv_convert(const char *toConverterName, const char *fromConverterName, char *target, int32_t targetCapacity, const char *source, int32_t sourceLength, UErrorCode *pErrorCode) { UConverter in, out; /* stack-allocated */ UConverter *inConverter, *outConverter; int32_t targetLength; if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) { return 0; } if( source==nullptr || sourceLength<-1 || targetCapacity<0 || (targetCapacity>0 && target==nullptr) ) { *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; return 0; } /* if there is no input data, we're done */ if(sourceLength==0 || (sourceLength<0 && *source==0)) { return u_terminateChars(target, targetCapacity, 0, pErrorCode); } /* create the converters */ inConverter=ucnv_createConverter(&in, fromConverterName, pErrorCode); if(U_FAILURE(*pErrorCode)) { return 0; } outConverter=ucnv_createConverter(&out, toConverterName, pErrorCode); if(U_FAILURE(*pErrorCode)) { ucnv_close(inConverter); return 0; } targetLength=ucnv_internalConvert(outConverter, inConverter, target, targetCapacity, source, sourceLength, pErrorCode); ucnv_close(inConverter); ucnv_close(outConverter); return targetLength; } /* @internal */ static int32_t ucnv_convertAlgorithmic(UBool convertToAlgorithmic, UConverterType algorithmicType, UConverter *cnv, char *target, int32_t targetCapacity, const char *source, int32_t sourceLength, UErrorCode *pErrorCode) { UConverter algoConverterStatic; /* stack-allocated */ UConverter *algoConverter, *to, *from; int32_t targetLength; if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) { return 0; } if( cnv==nullptr || source==nullptr || sourceLength<-1 || targetCapacity<0 || (targetCapacity>0 && target==nullptr) ) { *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; return 0; } /* if there is no input data, we're done */ if(sourceLength==0 || (sourceLength<0 && *source==0)) { return u_terminateChars(target, targetCapacity, 0, pErrorCode); } /* create the algorithmic converter */ algoConverter=ucnv_createAlgorithmicConverter(&algoConverterStatic, algorithmicType, "", 0, pErrorCode); if(U_FAILURE(*pErrorCode)) { return 0; } /* reset the other converter */ if(convertToAlgorithmic) { /* cnv->Unicode->algo */ ucnv_resetToUnicode(cnv); to=algoConverter; from=cnv; } else { /* algo->Unicode->cnv */ ucnv_resetFromUnicode(cnv); from=algoConverter; to=cnv; } targetLength=ucnv_internalConvert(to, from, target, targetCapacity, source, sourceLength, pErrorCode); ucnv_close(algoConverter); return targetLength; } U_CAPI int32_t U_EXPORT2 ucnv_toAlgorithmic(UConverterType algorithmicType, UConverter *cnv, char *target, int32_t targetCapacity, const char *source, int32_t sourceLength, UErrorCode *pErrorCode) { return ucnv_convertAlgorithmic(true, algorithmicType, cnv, target, targetCapacity, source, sourceLength, pErrorCode); } U_CAPI int32_t U_EXPORT2 ucnv_fromAlgorithmic(UConverter *cnv, UConverterType algorithmicType, char *target, int32_t targetCapacity, const char *source, int32_t sourceLength, UErrorCode *pErrorCode) UPRV_NO_SANITIZE_UNDEFINED { if(algorithmicType<0 || UCNV_NUMBER_OF_SUPPORTED_CONVERTER_TYPES<=algorithmicType) { *pErrorCode = U_ILLEGAL_ARGUMENT_ERROR; return 0; } return ucnv_convertAlgorithmic(false, algorithmicType, cnv, target, targetCapacity, source, sourceLength, pErrorCode); } U_CAPI UConverterType U_EXPORT2 ucnv_getType(const UConverter* converter) { int8_t type = converter->sharedData->staticData->conversionType; #if !UCONFIG_NO_LEGACY_CONVERSION if(type == UCNV_MBCS) { return ucnv_MBCSGetType(converter); } #endif return (UConverterType)type; } U_CAPI void U_EXPORT2 ucnv_getStarters(const UConverter* converter, UBool starters[256], UErrorCode* err) { if (err == nullptr || U_FAILURE(*err)) { return; } if(converter->sharedData->impl->getStarters != nullptr) { converter->sharedData->impl->getStarters(converter, starters, err); } else { *err = U_ILLEGAL_ARGUMENT_ERROR; } } static const UAmbiguousConverter *ucnv_getAmbiguous(const UConverter *cnv) { UErrorCode errorCode; const char *name; int32_t i; if(cnv==nullptr) { return nullptr; } errorCode=U_ZERO_ERROR; name=ucnv_getName(cnv, &errorCode); if(U_FAILURE(errorCode)) { return nullptr; } for(i=0; i<UPRV_LENGTHOF(ambiguousConverters); ++i) { if(0==uprv_strcmp(name, ambiguousConverters[i].name)) { return ambiguousConverters+i; } } return nullptr; } U_CAPI void U_EXPORT2 ucnv_fixFileSeparator(const UConverter *cnv, char16_t* source, int32_t sourceLength) { const UAmbiguousConverter *a; int32_t i; char16_t variant5c; if(cnv==nullptr || source==nullptr || sourceLength<=0 || (a=ucnv_getAmbiguous(cnv))==nullptr) { return; } variant5c=a->variant5c; for(i=0; i<sourceLength; ++i) { if(source[i]==variant5c) { source[i]=0x5c; } } } U_CAPI UBool U_EXPORT2 ucnv_isAmbiguous(const UConverter *cnv) { return (UBool)(ucnv_getAmbiguous(cnv)!=nullptr); } U_CAPI void U_EXPORT2 ucnv_setFallback(UConverter *cnv, UBool usesFallback) { cnv->useFallback = usesFallback; } U_CAPI UBool U_EXPORT2 ucnv_usesFallback(const UConverter *cnv) { return cnv->useFallback; } U_CAPI void U_EXPORT2 ucnv_getInvalidChars (const UConverter * converter, char *errBytes, int8_t * len, UErrorCode * err) { if (err == nullptr || U_FAILURE(*err)) { return; } if (len == nullptr || errBytes == nullptr || converter == nullptr) { *err = U_ILLEGAL_ARGUMENT_ERROR; return; } if (*len < converter->invalidCharLength) { *err = U_INDEX_OUTOFBOUNDS_ERROR; return; } if ((*len = converter->invalidCharLength) > 0) { uprv_memcpy (errBytes, converter->invalidCharBuffer, *len); } } U_CAPI void U_EXPORT2 ucnv_getInvalidUChars (const UConverter * converter, char16_t *errChars, int8_t * len, UErrorCode * err) { if (err == nullptr || U_FAILURE(*err)) { return; } if (len == nullptr || errChars == nullptr || converter == nullptr) { *err = U_ILLEGAL_ARGUMENT_ERROR; return; } if (*len < converter->invalidUCharLength) { *err = U_INDEX_OUTOFBOUNDS_ERROR; return; } if ((*len = converter->invalidUCharLength) > 0) { u_memcpy (errChars, converter->invalidUCharBuffer, *len); } } #define SIG_MAX_LEN … U_CAPI const char* U_EXPORT2 ucnv_detectUnicodeSignature( const char* source, int32_t sourceLength, int32_t* signatureLength, UErrorCode* pErrorCode) { int32_t dummy; /* initial 0xa5 bytes: make sure that if we read <SIG_MAX_LEN * bytes we don't misdetect something */ char start[SIG_MAX_LEN]={ '\xa5', '\xa5', '\xa5', '\xa5', '\xa5' }; int i = 0; if((pErrorCode==nullptr) || U_FAILURE(*pErrorCode)){ return nullptr; } if(source == nullptr || sourceLength < -1){ *pErrorCode = U_ILLEGAL_ARGUMENT_ERROR; return nullptr; } if(signatureLength == nullptr) { signatureLength = &dummy; } if(sourceLength==-1){ sourceLength=(int32_t)uprv_strlen(source); } while(i<sourceLength&& i<SIG_MAX_LEN){ start[i]=source[i]; i++; } if(start[0] == '\xFE' && start[1] == '\xFF') { *signatureLength=2; return "UTF-16BE"; } else if(start[0] == '\xFF' && start[1] == '\xFE') { if(start[2] == '\x00' && start[3] =='\x00') { *signatureLength=4; return "UTF-32LE"; } else { *signatureLength=2; return "UTF-16LE"; } } else if(start[0] == '\xEF' && start[1] == '\xBB' && start[2] == '\xBF') { *signatureLength=3; return "UTF-8"; } else if(start[0] == '\x00' && start[1] == '\x00' && start[2] == '\xFE' && start[3]=='\xFF') { *signatureLength=4; return "UTF-32BE"; } else if(start[0] == '\x0E' && start[1] == '\xFE' && start[2] == '\xFF') { *signatureLength=3; return "SCSU"; } else if(start[0] == '\xFB' && start[1] == '\xEE' && start[2] == '\x28') { *signatureLength=3; return "BOCU-1"; } else if(start[0] == '\x2B' && start[1] == '\x2F' && start[2] == '\x76') { /* * UTF-7: Initial U+FEFF is encoded as +/v8 or +/v9 or +/v+ or +/v/ * depending on the second UTF-16 code unit. * Detect the entire, closed Unicode mode sequence +/v8- for only U+FEFF * if it occurs. * * So far we have +/v */ if(start[3] == '\x38' && start[4] == '\x2D') { /* 5 bytes +/v8- */ *signatureLength=5; return "UTF-7"; } else if(start[3] == '\x38' || start[3] == '\x39' || start[3] == '\x2B' || start[3] == '\x2F') { /* 4 bytes +/v8 or +/v9 or +/v+ or +/v/ */ *signatureLength=4; return "UTF-7"; } }else if(start[0]=='\xDD' && start[1]== '\x73'&& start[2]=='\x66' && start[3]=='\x73'){ *signatureLength=4; return "UTF-EBCDIC"; } /* no known Unicode signature byte sequence recognized */ *signatureLength=0; return nullptr; } U_CAPI int32_t U_EXPORT2 ucnv_fromUCountPending(const UConverter* cnv, UErrorCode* status) { if(status == nullptr || U_FAILURE(*status)){ return -1; } if(cnv == nullptr){ *status = U_ILLEGAL_ARGUMENT_ERROR; return -1; } if(cnv->preFromUFirstCP >= 0){ return U16_LENGTH(cnv->preFromUFirstCP)+cnv->preFromULength ; }else if(cnv->preFromULength < 0){ return -cnv->preFromULength ; }else if(cnv->fromUChar32 > 0){ return 1; } return 0; } U_CAPI int32_t U_EXPORT2 ucnv_toUCountPending(const UConverter* cnv, UErrorCode* status){ if(status == nullptr || U_FAILURE(*status)){ return -1; } if(cnv == nullptr){ *status = U_ILLEGAL_ARGUMENT_ERROR; return -1; } if(cnv->preToULength > 0){ return cnv->preToULength ; }else if(cnv->preToULength < 0){ return -cnv->preToULength; }else if(cnv->toULength > 0){ return cnv->toULength; } return 0; } U_CAPI UBool U_EXPORT2 ucnv_isFixedWidth(UConverter *cnv, UErrorCode *status){ if (U_FAILURE(*status)) { return false; } if (cnv == nullptr) { *status = U_ILLEGAL_ARGUMENT_ERROR; return false; } switch (ucnv_getType(cnv)) { case UCNV_SBCS: case UCNV_DBCS: case UCNV_UTF32_BigEndian: case UCNV_UTF32_LittleEndian: case UCNV_UTF32: case UCNV_US_ASCII: return true; default: return false; } } #endif /* * Hey, Emacs, please set the following: * * Local Variables: * indent-tabs-mode: nil * End: * */
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