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-rw-r--r--intl/icu/source/common/ucnv_u8.cpp944
1 files changed, 944 insertions, 0 deletions
diff --git a/intl/icu/source/common/ucnv_u8.cpp b/intl/icu/source/common/ucnv_u8.cpp
new file mode 100644
index 0000000000..cf3bb22a02
--- /dev/null
+++ b/intl/icu/source/common/ucnv_u8.cpp
@@ -0,0 +1,944 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+**********************************************************************
+* Copyright (C) 2002-2016, International Business Machines
+* Corporation and others. All Rights Reserved.
+**********************************************************************
+* file name: ucnv_u8.c
+* encoding: UTF-8
+* tab size: 8 (not used)
+* indentation:4
+*
+* created on: 2002jul01
+* created by: Markus W. Scherer
+*
+* UTF-8 converter implementation. Used to be in ucnv_utf.c.
+*
+* Also, CESU-8 implementation, see UTR 26.
+* The CESU-8 converter uses all the same functions as the
+* UTF-8 converter, with a branch for converting supplementary code points.
+*/
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_CONVERSION
+
+#include "unicode/ucnv.h"
+#include "unicode/utf.h"
+#include "unicode/utf8.h"
+#include "unicode/utf16.h"
+#include "uassert.h"
+#include "ucnv_bld.h"
+#include "ucnv_cnv.h"
+#include "cmemory.h"
+#include "ustr_imp.h"
+
+/* Prototypes --------------------------------------------------------------- */
+
+/* Keep these here to make finicky compilers happy */
+
+U_CFUNC void ucnv_fromUnicode_UTF8(UConverterFromUnicodeArgs *args,
+ UErrorCode *err);
+U_CFUNC void ucnv_fromUnicode_UTF8_OFFSETS_LOGIC(UConverterFromUnicodeArgs *args,
+ UErrorCode *err);
+
+
+/* UTF-8 -------------------------------------------------------------------- */
+
+#define MAXIMUM_UCS2 0x0000FFFF
+
+static const uint32_t offsetsFromUTF8[5] = {0,
+ (uint32_t) 0x00000000, (uint32_t) 0x00003080, (uint32_t) 0x000E2080,
+ (uint32_t) 0x03C82080
+};
+
+static UBool hasCESU8Data(const UConverter *cnv)
+{
+#if UCONFIG_ONLY_HTML_CONVERSION
+ return false;
+#else
+ return (UBool)(cnv->sharedData == &_CESU8Data);
+#endif
+}
+U_CDECL_BEGIN
+static void U_CALLCONV ucnv_toUnicode_UTF8 (UConverterToUnicodeArgs * args,
+ UErrorCode * err)
+{
+ UConverter *cnv = args->converter;
+ const unsigned char *mySource = (unsigned char *) args->source;
+ char16_t *myTarget = args->target;
+ const unsigned char *sourceLimit = (unsigned char *) args->sourceLimit;
+ const char16_t *targetLimit = args->targetLimit;
+ unsigned char *toUBytes = cnv->toUBytes;
+ UBool isCESU8 = hasCESU8Data(cnv);
+ uint32_t ch, ch2 = 0;
+ int32_t i, inBytes;
+
+ /* Restore size of current sequence */
+ if (cnv->toULength > 0 && myTarget < targetLimit)
+ {
+ inBytes = cnv->mode; /* restore # of bytes to consume */
+ i = cnv->toULength; /* restore # of bytes consumed */
+ cnv->toULength = 0;
+
+ ch = cnv->toUnicodeStatus;/*Stores the previously calculated ch from a previous call*/
+ cnv->toUnicodeStatus = 0;
+ goto morebytes;
+ }
+
+
+ while (mySource < sourceLimit && myTarget < targetLimit)
+ {
+ ch = *(mySource++);
+ if (U8_IS_SINGLE(ch)) /* Simple case */
+ {
+ *(myTarget++) = (char16_t) ch;
+ }
+ else
+ {
+ /* store the first char */
+ toUBytes[0] = (char)ch;
+ inBytes = U8_COUNT_BYTES_NON_ASCII(ch); /* lookup current sequence length */
+ i = 1;
+
+morebytes:
+ while (i < inBytes)
+ {
+ if (mySource < sourceLimit)
+ {
+ toUBytes[i] = (char) (ch2 = *mySource);
+ if (!icu::UTF8::isValidTrail(ch, static_cast<uint8_t>(ch2), i, inBytes) &&
+ !(isCESU8 && i == 1 && ch == 0xed && U8_IS_TRAIL(ch2)))
+ {
+ break; /* i < inBytes */
+ }
+ ch = (ch << 6) + ch2;
+ ++mySource;
+ i++;
+ }
+ else
+ {
+ /* stores a partially calculated target*/
+ cnv->toUnicodeStatus = ch;
+ cnv->mode = inBytes;
+ cnv->toULength = (int8_t) i;
+ goto donefornow;
+ }
+ }
+
+ // In CESU-8, only surrogates, not supplementary code points, are encoded directly.
+ if (i == inBytes && (!isCESU8 || i <= 3))
+ {
+ /* Remove the accumulated high bits */
+ ch -= offsetsFromUTF8[inBytes];
+
+ /* Normal valid byte when the loop has not prematurely terminated (i < inBytes) */
+ if (ch <= MAXIMUM_UCS2)
+ {
+ /* fits in 16 bits */
+ *(myTarget++) = (char16_t) ch;
+ }
+ else
+ {
+ /* write out the surrogates */
+ *(myTarget++) = U16_LEAD(ch);
+ ch = U16_TRAIL(ch);
+ if (myTarget < targetLimit)
+ {
+ *(myTarget++) = (char16_t)ch;
+ }
+ else
+ {
+ /* Put in overflow buffer (not handled here) */
+ cnv->UCharErrorBuffer[0] = (char16_t) ch;
+ cnv->UCharErrorBufferLength = 1;
+ *err = U_BUFFER_OVERFLOW_ERROR;
+ break;
+ }
+ }
+ }
+ else
+ {
+ cnv->toULength = (int8_t)i;
+ *err = U_ILLEGAL_CHAR_FOUND;
+ break;
+ }
+ }
+ }
+
+donefornow:
+ if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err))
+ {
+ /* End of target buffer */
+ *err = U_BUFFER_OVERFLOW_ERROR;
+ }
+
+ args->target = myTarget;
+ args->source = (const char *) mySource;
+}
+
+static void U_CALLCONV ucnv_toUnicode_UTF8_OFFSETS_LOGIC (UConverterToUnicodeArgs * args,
+ UErrorCode * err)
+{
+ UConverter *cnv = args->converter;
+ const unsigned char *mySource = (unsigned char *) args->source;
+ char16_t *myTarget = args->target;
+ int32_t *myOffsets = args->offsets;
+ int32_t offsetNum = 0;
+ const unsigned char *sourceLimit = (unsigned char *) args->sourceLimit;
+ const char16_t *targetLimit = args->targetLimit;
+ unsigned char *toUBytes = cnv->toUBytes;
+ UBool isCESU8 = hasCESU8Data(cnv);
+ uint32_t ch, ch2 = 0;
+ int32_t i, inBytes;
+
+ /* Restore size of current sequence */
+ if (cnv->toULength > 0 && myTarget < targetLimit)
+ {
+ inBytes = cnv->mode; /* restore # of bytes to consume */
+ i = cnv->toULength; /* restore # of bytes consumed */
+ cnv->toULength = 0;
+
+ ch = cnv->toUnicodeStatus;/*Stores the previously calculated ch from a previous call*/
+ cnv->toUnicodeStatus = 0;
+ goto morebytes;
+ }
+
+ while (mySource < sourceLimit && myTarget < targetLimit)
+ {
+ ch = *(mySource++);
+ if (U8_IS_SINGLE(ch)) /* Simple case */
+ {
+ *(myTarget++) = (char16_t) ch;
+ *(myOffsets++) = offsetNum++;
+ }
+ else
+ {
+ toUBytes[0] = (char)ch;
+ inBytes = U8_COUNT_BYTES_NON_ASCII(ch);
+ i = 1;
+
+morebytes:
+ while (i < inBytes)
+ {
+ if (mySource < sourceLimit)
+ {
+ toUBytes[i] = (char) (ch2 = *mySource);
+ if (!icu::UTF8::isValidTrail(ch, static_cast<uint8_t>(ch2), i, inBytes) &&
+ !(isCESU8 && i == 1 && ch == 0xed && U8_IS_TRAIL(ch2)))
+ {
+ break; /* i < inBytes */
+ }
+ ch = (ch << 6) + ch2;
+ ++mySource;
+ i++;
+ }
+ else
+ {
+ cnv->toUnicodeStatus = ch;
+ cnv->mode = inBytes;
+ cnv->toULength = (int8_t)i;
+ goto donefornow;
+ }
+ }
+
+ // In CESU-8, only surrogates, not supplementary code points, are encoded directly.
+ if (i == inBytes && (!isCESU8 || i <= 3))
+ {
+ /* Remove the accumulated high bits */
+ ch -= offsetsFromUTF8[inBytes];
+
+ /* Normal valid byte when the loop has not prematurely terminated (i < inBytes) */
+ if (ch <= MAXIMUM_UCS2)
+ {
+ /* fits in 16 bits */
+ *(myTarget++) = (char16_t) ch;
+ *(myOffsets++) = offsetNum;
+ }
+ else
+ {
+ /* write out the surrogates */
+ *(myTarget++) = U16_LEAD(ch);
+ *(myOffsets++) = offsetNum;
+ ch = U16_TRAIL(ch);
+ if (myTarget < targetLimit)
+ {
+ *(myTarget++) = (char16_t)ch;
+ *(myOffsets++) = offsetNum;
+ }
+ else
+ {
+ cnv->UCharErrorBuffer[0] = (char16_t) ch;
+ cnv->UCharErrorBufferLength = 1;
+ *err = U_BUFFER_OVERFLOW_ERROR;
+ }
+ }
+ offsetNum += i;
+ }
+ else
+ {
+ cnv->toULength = (int8_t)i;
+ *err = U_ILLEGAL_CHAR_FOUND;
+ break;
+ }
+ }
+ }
+
+donefornow:
+ if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err))
+ { /* End of target buffer */
+ *err = U_BUFFER_OVERFLOW_ERROR;
+ }
+
+ args->target = myTarget;
+ args->source = (const char *) mySource;
+ args->offsets = myOffsets;
+}
+U_CDECL_END
+
+U_CFUNC void U_CALLCONV ucnv_fromUnicode_UTF8 (UConverterFromUnicodeArgs * args,
+ UErrorCode * err)
+{
+ UConverter *cnv = args->converter;
+ const char16_t *mySource = args->source;
+ const char16_t *sourceLimit = args->sourceLimit;
+ uint8_t *myTarget = (uint8_t *) args->target;
+ const uint8_t *targetLimit = (uint8_t *) args->targetLimit;
+ uint8_t *tempPtr;
+ UChar32 ch;
+ uint8_t tempBuf[4];
+ int32_t indexToWrite;
+ UBool isNotCESU8 = !hasCESU8Data(cnv);
+
+ if (cnv->fromUChar32 && myTarget < targetLimit)
+ {
+ ch = cnv->fromUChar32;
+ cnv->fromUChar32 = 0;
+ goto lowsurrogate;
+ }
+
+ while (mySource < sourceLimit && myTarget < targetLimit)
+ {
+ ch = *(mySource++);
+
+ if (ch < 0x80) /* Single byte */
+ {
+ *(myTarget++) = (uint8_t) ch;
+ }
+ else if (ch < 0x800) /* Double byte */
+ {
+ *(myTarget++) = (uint8_t) ((ch >> 6) | 0xc0);
+ if (myTarget < targetLimit)
+ {
+ *(myTarget++) = (uint8_t) ((ch & 0x3f) | 0x80);
+ }
+ else
+ {
+ cnv->charErrorBuffer[0] = (uint8_t) ((ch & 0x3f) | 0x80);
+ cnv->charErrorBufferLength = 1;
+ *err = U_BUFFER_OVERFLOW_ERROR;
+ }
+ }
+ else {
+ /* Check for surrogates */
+ if(U16_IS_SURROGATE(ch) && isNotCESU8) {
+lowsurrogate:
+ if (mySource < sourceLimit) {
+ /* test both code units */
+ if(U16_IS_SURROGATE_LEAD(ch) && U16_IS_TRAIL(*mySource)) {
+ /* convert and consume this supplementary code point */
+ ch=U16_GET_SUPPLEMENTARY(ch, *mySource);
+ ++mySource;
+ /* exit this condition tree */
+ }
+ else {
+ /* this is an unpaired trail or lead code unit */
+ /* callback(illegal) */
+ cnv->fromUChar32 = ch;
+ *err = U_ILLEGAL_CHAR_FOUND;
+ break;
+ }
+ }
+ else {
+ /* no more input */
+ cnv->fromUChar32 = ch;
+ break;
+ }
+ }
+
+ /* Do we write the buffer directly for speed,
+ or do we have to be careful about target buffer space? */
+ tempPtr = (((targetLimit - myTarget) >= 4) ? myTarget : tempBuf);
+
+ if (ch <= MAXIMUM_UCS2) {
+ indexToWrite = 2;
+ tempPtr[0] = (uint8_t) ((ch >> 12) | 0xe0);
+ }
+ else {
+ indexToWrite = 3;
+ tempPtr[0] = (uint8_t) ((ch >> 18) | 0xf0);
+ tempPtr[1] = (uint8_t) (((ch >> 12) & 0x3f) | 0x80);
+ }
+ tempPtr[indexToWrite-1] = (uint8_t) (((ch >> 6) & 0x3f) | 0x80);
+ tempPtr[indexToWrite] = (uint8_t) ((ch & 0x3f) | 0x80);
+
+ if (tempPtr == myTarget) {
+ /* There was enough space to write the codepoint directly. */
+ myTarget += (indexToWrite + 1);
+ }
+ else {
+ /* We might run out of room soon. Write it slowly. */
+ for (; tempPtr <= (tempBuf + indexToWrite); tempPtr++) {
+ if (myTarget < targetLimit) {
+ *(myTarget++) = *tempPtr;
+ }
+ else {
+ cnv->charErrorBuffer[cnv->charErrorBufferLength++] = *tempPtr;
+ *err = U_BUFFER_OVERFLOW_ERROR;
+ }
+ }
+ }
+ }
+ }
+
+ if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err))
+ {
+ *err = U_BUFFER_OVERFLOW_ERROR;
+ }
+
+ args->target = (char *) myTarget;
+ args->source = mySource;
+}
+
+U_CFUNC void U_CALLCONV ucnv_fromUnicode_UTF8_OFFSETS_LOGIC (UConverterFromUnicodeArgs * args,
+ UErrorCode * err)
+{
+ UConverter *cnv = args->converter;
+ const char16_t *mySource = args->source;
+ int32_t *myOffsets = args->offsets;
+ const char16_t *sourceLimit = args->sourceLimit;
+ uint8_t *myTarget = (uint8_t *) args->target;
+ const uint8_t *targetLimit = (uint8_t *) args->targetLimit;
+ uint8_t *tempPtr;
+ UChar32 ch;
+ int32_t offsetNum, nextSourceIndex;
+ int32_t indexToWrite;
+ uint8_t tempBuf[4];
+ UBool isNotCESU8 = !hasCESU8Data(cnv);
+
+ if (cnv->fromUChar32 && myTarget < targetLimit)
+ {
+ ch = cnv->fromUChar32;
+ cnv->fromUChar32 = 0;
+ offsetNum = -1;
+ nextSourceIndex = 0;
+ goto lowsurrogate;
+ } else {
+ offsetNum = 0;
+ }
+
+ while (mySource < sourceLimit && myTarget < targetLimit)
+ {
+ ch = *(mySource++);
+
+ if (ch < 0x80) /* Single byte */
+ {
+ *(myOffsets++) = offsetNum++;
+ *(myTarget++) = (char) ch;
+ }
+ else if (ch < 0x800) /* Double byte */
+ {
+ *(myOffsets++) = offsetNum;
+ *(myTarget++) = (uint8_t) ((ch >> 6) | 0xc0);
+ if (myTarget < targetLimit)
+ {
+ *(myOffsets++) = offsetNum++;
+ *(myTarget++) = (uint8_t) ((ch & 0x3f) | 0x80);
+ }
+ else
+ {
+ cnv->charErrorBuffer[0] = (uint8_t) ((ch & 0x3f) | 0x80);
+ cnv->charErrorBufferLength = 1;
+ *err = U_BUFFER_OVERFLOW_ERROR;
+ }
+ }
+ else
+ /* Check for surrogates */
+ {
+ nextSourceIndex = offsetNum + 1;
+
+ if(U16_IS_SURROGATE(ch) && isNotCESU8) {
+lowsurrogate:
+ if (mySource < sourceLimit) {
+ /* test both code units */
+ if(U16_IS_SURROGATE_LEAD(ch) && U16_IS_TRAIL(*mySource)) {
+ /* convert and consume this supplementary code point */
+ ch=U16_GET_SUPPLEMENTARY(ch, *mySource);
+ ++mySource;
+ ++nextSourceIndex;
+ /* exit this condition tree */
+ }
+ else {
+ /* this is an unpaired trail or lead code unit */
+ /* callback(illegal) */
+ cnv->fromUChar32 = ch;
+ *err = U_ILLEGAL_CHAR_FOUND;
+ break;
+ }
+ }
+ else {
+ /* no more input */
+ cnv->fromUChar32 = ch;
+ break;
+ }
+ }
+
+ /* Do we write the buffer directly for speed,
+ or do we have to be careful about target buffer space? */
+ tempPtr = (((targetLimit - myTarget) >= 4) ? myTarget : tempBuf);
+
+ if (ch <= MAXIMUM_UCS2) {
+ indexToWrite = 2;
+ tempPtr[0] = (uint8_t) ((ch >> 12) | 0xe0);
+ }
+ else {
+ indexToWrite = 3;
+ tempPtr[0] = (uint8_t) ((ch >> 18) | 0xf0);
+ tempPtr[1] = (uint8_t) (((ch >> 12) & 0x3f) | 0x80);
+ }
+ tempPtr[indexToWrite-1] = (uint8_t) (((ch >> 6) & 0x3f) | 0x80);
+ tempPtr[indexToWrite] = (uint8_t) ((ch & 0x3f) | 0x80);
+
+ if (tempPtr == myTarget) {
+ /* There was enough space to write the codepoint directly. */
+ myTarget += (indexToWrite + 1);
+ myOffsets[0] = offsetNum;
+ myOffsets[1] = offsetNum;
+ myOffsets[2] = offsetNum;
+ if (indexToWrite >= 3) {
+ myOffsets[3] = offsetNum;
+ }
+ myOffsets += (indexToWrite + 1);
+ }
+ else {
+ /* We might run out of room soon. Write it slowly. */
+ for (; tempPtr <= (tempBuf + indexToWrite); tempPtr++) {
+ if (myTarget < targetLimit)
+ {
+ *(myOffsets++) = offsetNum;
+ *(myTarget++) = *tempPtr;
+ }
+ else
+ {
+ cnv->charErrorBuffer[cnv->charErrorBufferLength++] = *tempPtr;
+ *err = U_BUFFER_OVERFLOW_ERROR;
+ }
+ }
+ }
+ offsetNum = nextSourceIndex;
+ }
+ }
+
+ if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err))
+ {
+ *err = U_BUFFER_OVERFLOW_ERROR;
+ }
+
+ args->target = (char *) myTarget;
+ args->source = mySource;
+ args->offsets = myOffsets;
+}
+
+U_CDECL_BEGIN
+static UChar32 U_CALLCONV ucnv_getNextUChar_UTF8(UConverterToUnicodeArgs *args,
+ UErrorCode *err) {
+ UConverter *cnv;
+ const uint8_t *sourceInitial;
+ const uint8_t *source;
+ uint8_t myByte;
+ UChar32 ch;
+ int8_t i;
+
+ /* UTF-8 only here, the framework handles CESU-8 to combine surrogate pairs */
+
+ cnv = args->converter;
+ sourceInitial = source = (const uint8_t *)args->source;
+ if (source >= (const uint8_t *)args->sourceLimit)
+ {
+ /* no input */
+ *err = U_INDEX_OUTOFBOUNDS_ERROR;
+ return 0xffff;
+ }
+
+ myByte = (uint8_t)*(source++);
+ if (U8_IS_SINGLE(myByte))
+ {
+ args->source = (const char *)source;
+ return (UChar32)myByte;
+ }
+
+ uint16_t countTrailBytes = U8_COUNT_TRAIL_BYTES(myByte);
+ if (countTrailBytes == 0) {
+ cnv->toUBytes[0] = myByte;
+ cnv->toULength = 1;
+ *err = U_ILLEGAL_CHAR_FOUND;
+ args->source = (const char *)source;
+ return 0xffff;
+ }
+
+ /*The byte sequence is longer than the buffer area passed*/
+ if (((const char *)source + countTrailBytes) > args->sourceLimit)
+ {
+ /* check if all of the remaining bytes are trail bytes */
+ uint16_t extraBytesToWrite = countTrailBytes + 1;
+ cnv->toUBytes[0] = myByte;
+ i = 1;
+ *err = U_TRUNCATED_CHAR_FOUND;
+ while(source < (const uint8_t *)args->sourceLimit) {
+ uint8_t b = *source;
+ if(icu::UTF8::isValidTrail(myByte, b, i, extraBytesToWrite)) {
+ cnv->toUBytes[i++] = b;
+ ++source;
+ } else {
+ /* error even before we run out of input */
+ *err = U_ILLEGAL_CHAR_FOUND;
+ break;
+ }
+ }
+ cnv->toULength = i;
+ args->source = (const char *)source;
+ return 0xffff;
+ }
+
+ ch = myByte << 6;
+ if(countTrailBytes == 2) {
+ uint8_t t1 = *source, t2;
+ if(U8_IS_VALID_LEAD3_AND_T1(myByte, t1) && U8_IS_TRAIL(t2 = *++source)) {
+ args->source = (const char *)(source + 1);
+ return (((ch + t1) << 6) + t2) - offsetsFromUTF8[3];
+ }
+ } else if(countTrailBytes == 1) {
+ uint8_t t1 = *source;
+ if(U8_IS_TRAIL(t1)) {
+ args->source = (const char *)(source + 1);
+ return (ch + t1) - offsetsFromUTF8[2];
+ }
+ } else { // countTrailBytes == 3
+ uint8_t t1 = *source, t2, t3;
+ if(U8_IS_VALID_LEAD4_AND_T1(myByte, t1) && U8_IS_TRAIL(t2 = *++source) &&
+ U8_IS_TRAIL(t3 = *++source)) {
+ args->source = (const char *)(source + 1);
+ return (((((ch + t1) << 6) + t2) << 6) + t3) - offsetsFromUTF8[4];
+ }
+ }
+ args->source = (const char *)source;
+
+ for(i = 0; sourceInitial < source; ++i) {
+ cnv->toUBytes[i] = *sourceInitial++;
+ }
+ cnv->toULength = i;
+ *err = U_ILLEGAL_CHAR_FOUND;
+ return 0xffff;
+}
+U_CDECL_END
+
+/* UTF-8-from-UTF-8 conversion functions ------------------------------------ */
+
+U_CDECL_BEGIN
+/* "Convert" UTF-8 to UTF-8: Validate and copy. Modified from ucnv_DBCSFromUTF8(). */
+static void U_CALLCONV
+ucnv_UTF8FromUTF8(UConverterFromUnicodeArgs *pFromUArgs,
+ UConverterToUnicodeArgs *pToUArgs,
+ UErrorCode *pErrorCode) {
+ UConverter *utf8;
+ const uint8_t *source, *sourceLimit;
+ uint8_t *target;
+ int32_t targetCapacity;
+ int32_t count;
+
+ int8_t oldToULength, toULength, toULimit;
+
+ UChar32 c;
+ uint8_t b, t1, t2;
+
+ /* set up the local pointers */
+ utf8=pToUArgs->converter;
+ source=(uint8_t *)pToUArgs->source;
+ sourceLimit=(uint8_t *)pToUArgs->sourceLimit;
+ target=(uint8_t *)pFromUArgs->target;
+ targetCapacity=(int32_t)(pFromUArgs->targetLimit-pFromUArgs->target);
+
+ /* get the converter state from the UTF-8 UConverter */
+ if(utf8->toULength > 0) {
+ toULength=oldToULength=utf8->toULength;
+ toULimit=(int8_t)utf8->mode;
+ c=(UChar32)utf8->toUnicodeStatus;
+ } else {
+ toULength=oldToULength=toULimit=0;
+ c = 0;
+ }
+
+ count=(int32_t)(sourceLimit-source)+oldToULength;
+ if(count<toULimit) {
+ /*
+ * Not enough input to complete the partial character.
+ * Jump to moreBytes below - it will not output to target.
+ */
+ } else if(targetCapacity<toULimit) {
+ /*
+ * Not enough target capacity to output the partial character.
+ * Let the standard converter handle this.
+ */
+ *pErrorCode=U_USING_DEFAULT_WARNING;
+ return;
+ } else {
+ // Use a single counter for source and target, counting the minimum of
+ // the source length and the target capacity.
+ // Let the standard converter handle edge cases.
+ if(count>targetCapacity) {
+ count=targetCapacity;
+ }
+
+ // The conversion loop checks count>0 only once per character.
+ // If the buffer ends with a truncated sequence,
+ // then we reduce the count to stop before that,
+ // and collect the remaining bytes after the conversion loop.
+
+ // Do not go back into the bytes that will be read for finishing a partial
+ // sequence from the previous buffer.
+ int32_t length=count-toULength;
+ U8_TRUNCATE_IF_INCOMPLETE(source, 0, length);
+ count=toULength+length;
+ }
+
+ if(c!=0) {
+ utf8->toUnicodeStatus=0;
+ utf8->toULength=0;
+ goto moreBytes;
+ /* See note in ucnv_SBCSFromUTF8() about this goto. */
+ }
+
+ /* conversion loop */
+ while(count>0) {
+ b=*source++;
+ if(U8_IS_SINGLE(b)) {
+ /* convert ASCII */
+ *target++=b;
+ --count;
+ continue;
+ } else {
+ if(b>=0xe0) {
+ if( /* handle U+0800..U+FFFF inline */
+ b<0xf0 &&
+ U8_IS_VALID_LEAD3_AND_T1(b, t1=source[0]) &&
+ U8_IS_TRAIL(t2=source[1])
+ ) {
+ source+=2;
+ *target++=b;
+ *target++=t1;
+ *target++=t2;
+ count-=3;
+ continue;
+ }
+ } else {
+ if( /* handle U+0080..U+07FF inline */
+ b>=0xc2 &&
+ U8_IS_TRAIL(t1=*source)
+ ) {
+ ++source;
+ *target++=b;
+ *target++=t1;
+ count-=2;
+ continue;
+ }
+ }
+
+ /* handle "complicated" and error cases, and continuing partial characters */
+ oldToULength=0;
+ toULength=1;
+ toULimit=U8_COUNT_BYTES_NON_ASCII(b);
+ c=b;
+moreBytes:
+ while(toULength<toULimit) {
+ if(source<sourceLimit) {
+ b=*source;
+ if(icu::UTF8::isValidTrail(c, b, toULength, toULimit)) {
+ ++source;
+ ++toULength;
+ c=(c<<6)+b;
+ } else {
+ break; /* sequence too short, stop with toULength<toULimit */
+ }
+ } else {
+ /* store the partial UTF-8 character, compatible with the regular UTF-8 converter */
+ source-=(toULength-oldToULength);
+ while(oldToULength<toULength) {
+ utf8->toUBytes[oldToULength++]=*source++;
+ }
+ utf8->toUnicodeStatus=c;
+ utf8->toULength=toULength;
+ utf8->mode=toULimit;
+ pToUArgs->source=(char *)source;
+ pFromUArgs->target=(char *)target;
+ return;
+ }
+ }
+
+ if(toULength!=toULimit) {
+ /* error handling: illegal UTF-8 byte sequence */
+ source-=(toULength-oldToULength);
+ while(oldToULength<toULength) {
+ utf8->toUBytes[oldToULength++]=*source++;
+ }
+ utf8->toULength=toULength;
+ pToUArgs->source=(char *)source;
+ pFromUArgs->target=(char *)target;
+ *pErrorCode=U_ILLEGAL_CHAR_FOUND;
+ return;
+ }
+
+ /* copy the legal byte sequence to the target */
+ {
+ int8_t i;
+
+ for(i=0; i<oldToULength; ++i) {
+ *target++=utf8->toUBytes[i];
+ }
+ source-=(toULength-oldToULength);
+ for(; i<toULength; ++i) {
+ *target++=*source++;
+ }
+ count-=toULength;
+ }
+ }
+ }
+ U_ASSERT(count>=0);
+
+ if(U_SUCCESS(*pErrorCode) && source<sourceLimit) {
+ if(target==(const uint8_t *)pFromUArgs->targetLimit) {
+ *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
+ } else {
+ b=*source;
+ toULimit=U8_COUNT_BYTES(b);
+ if(toULimit>(sourceLimit-source)) {
+ /* collect a truncated byte sequence */
+ toULength=0;
+ c=b;
+ for(;;) {
+ utf8->toUBytes[toULength++]=b;
+ if(++source==sourceLimit) {
+ /* partial byte sequence at end of source */
+ utf8->toUnicodeStatus=c;
+ utf8->toULength=toULength;
+ utf8->mode=toULimit;
+ break;
+ } else if(!icu::UTF8::isValidTrail(c, b=*source, toULength, toULimit)) {
+ utf8->toULength=toULength;
+ *pErrorCode=U_ILLEGAL_CHAR_FOUND;
+ break;
+ }
+ c=(c<<6)+b;
+ }
+ } else {
+ /* partial-sequence target overflow: fall back to the pivoting implementation */
+ *pErrorCode=U_USING_DEFAULT_WARNING;
+ }
+ }
+ }
+
+ /* write back the updated pointers */
+ pToUArgs->source=(char *)source;
+ pFromUArgs->target=(char *)target;
+}
+
+U_CDECL_END
+
+/* UTF-8 converter data ----------------------------------------------------- */
+
+static const UConverterImpl _UTF8Impl={
+ UCNV_UTF8,
+
+ nullptr,
+ nullptr,
+
+ nullptr,
+ nullptr,
+ nullptr,
+
+ ucnv_toUnicode_UTF8,
+ ucnv_toUnicode_UTF8_OFFSETS_LOGIC,
+ ucnv_fromUnicode_UTF8,
+ ucnv_fromUnicode_UTF8_OFFSETS_LOGIC,
+ ucnv_getNextUChar_UTF8,
+
+ nullptr,
+ nullptr,
+ nullptr,
+ nullptr,
+ ucnv_getNonSurrogateUnicodeSet,
+
+ ucnv_UTF8FromUTF8,
+ ucnv_UTF8FromUTF8
+};
+
+/* The 1208 CCSID refers to any version of Unicode of UTF-8 */
+static const UConverterStaticData _UTF8StaticData={
+ sizeof(UConverterStaticData),
+ "UTF-8",
+ 1208, UCNV_IBM, UCNV_UTF8,
+ 1, 3, /* max 3 bytes per char16_t from UTF-8 (4 bytes from surrogate _pair_) */
+ { 0xef, 0xbf, 0xbd, 0 },3,false,false,
+ 0,
+ 0,
+ { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } /* reserved */
+};
+
+
+const UConverterSharedData _UTF8Data=
+ UCNV_IMMUTABLE_SHARED_DATA_INITIALIZER(&_UTF8StaticData, &_UTF8Impl);
+
+/* CESU-8 converter data ---------------------------------------------------- */
+
+static const UConverterImpl _CESU8Impl={
+ UCNV_CESU8,
+
+ nullptr,
+ nullptr,
+
+ nullptr,
+ nullptr,
+ nullptr,
+
+ ucnv_toUnicode_UTF8,
+ ucnv_toUnicode_UTF8_OFFSETS_LOGIC,
+ ucnv_fromUnicode_UTF8,
+ ucnv_fromUnicode_UTF8_OFFSETS_LOGIC,
+ nullptr,
+
+ nullptr,
+ nullptr,
+ nullptr,
+ nullptr,
+ ucnv_getCompleteUnicodeSet,
+
+ nullptr,
+ nullptr
+};
+
+static const UConverterStaticData _CESU8StaticData={
+ sizeof(UConverterStaticData),
+ "CESU-8",
+ 9400, /* CCSID for CESU-8 */
+ UCNV_UNKNOWN, UCNV_CESU8, 1, 3,
+ { 0xef, 0xbf, 0xbd, 0 },3,false,false,
+ 0,
+ 0,
+ { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } /* reserved */
+};
+
+
+const UConverterSharedData _CESU8Data=
+ UCNV_IMMUTABLE_SHARED_DATA_INITIALIZER(&_CESU8StaticData, &_CESU8Impl);
+
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 11:18:07 +0000