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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /intl/icu/source/common/ucnv.cpp
parentInitial commit. (diff)
downloadfirefox-esr-upstream.tar.xz
firefox-esr-upstream.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--intl/icu/source/common/ucnv.cpp2922
1 files changed, 2922 insertions, 0 deletions
diff --git a/intl/icu/source/common/ucnv.cpp b/intl/icu/source/common/ucnv.cpp
new file mode 100644
index 0000000000..a7a07d65d6
--- /dev/null
+++ b/intl/icu/source/common/ucnv.cpp
@@ -0,0 +1,2922 @@
+// © 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 1024
+
+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;
+
+ return;
+}
+
+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, 0, 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, 0, 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, 0, 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, 0, 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 5
+
+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:
+ *
+ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 10:53:58 +0000