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Unified Diff: icu51/source/common/ucnv_u8.c

Issue 20882002: Check in the pristine copy of ICU 51.2 (Closed) Base URL: svn://chrome-svn/chrome/trunk/deps/third_party/
Patch Set: Created 7 years, 5 months ago
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Index: icu51/source/common/ucnv_u8.c
===================================================================
--- icu51/source/common/ucnv_u8.c (revision 0)
+++ icu51/source/common/ucnv_u8.c (revision 0)
@@ -0,0 +1,1086 @@
+/*
+**********************************************************************
+* Copyright (C) 2002-2012, International Business Machines
+* Corporation and others. All Rights Reserved.
+**********************************************************************
+* file name: ucnv_u8.c
+* encoding: US-ASCII
+* 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 "ucnv_bld.h"
+#include "ucnv_cnv.h"
+#include "cmemory.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 -------------------------------------------------------------------- */
+
+/* UTF-8 Conversion DATA
+ * for more information see Unicode Standard 2.0, Transformation Formats Appendix A-9
+ */
+/*static const uint32_t REPLACEMENT_CHARACTER = 0x0000FFFD;*/
+#define MAXIMUM_UCS2 0x0000FFFF
+#define MAXIMUM_UTF 0x0010FFFF
+#define MAXIMUM_UCS4 0x7FFFFFFF
+#define HALF_SHIFT 10
+#define HALF_BASE 0x0010000
+#define HALF_MASK 0x3FF
+#define SURROGATE_HIGH_START 0xD800
+#define SURROGATE_HIGH_END 0xDBFF
+#define SURROGATE_LOW_START 0xDC00
+#define SURROGATE_LOW_END 0xDFFF
+
+/* -SURROGATE_LOW_START + HALF_BASE */
+#define SURROGATE_LOW_BASE 9216
+
+static const uint32_t offsetsFromUTF8[7] = {0,
+ (uint32_t) 0x00000000, (uint32_t) 0x00003080, (uint32_t) 0x000E2080,
+ (uint32_t) 0x03C82080, (uint32_t) 0xFA082080, (uint32_t) 0x82082080
+};
+
+/* END OF UTF-8 Conversion DATA */
+
+static const int8_t bytesFromUTF8[256] = {
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 0, 0
+};
+
+/*
+ * Starting with Unicode 3.0.1:
+ * UTF-8 byte sequences of length N _must_ encode code points of or above utf8_minChar32[N];
+ * byte sequences with more than 4 bytes are illegal in UTF-8,
+ * which is tested with impossible values for them
+ */
+static const uint32_t
+utf8_minChar32[7]={ 0, 0, 0x80, 0x800, 0x10000, 0xffffffff, 0xffffffff };
+
+static void ucnv_toUnicode_UTF8 (UConverterToUnicodeArgs * args,
+ UErrorCode * err)
+{
+ UConverter *cnv = args->converter;
+ const unsigned char *mySource = (unsigned char *) args->source;
+ UChar *myTarget = args->target;
+ const unsigned char *sourceLimit = (unsigned char *) args->sourceLimit;
+ const UChar *targetLimit = args->targetLimit;
+ unsigned char *toUBytes = cnv->toUBytes;
+ UBool isCESU8 = (UBool)(cnv->sharedData == &_CESU8Data);
+ uint32_t ch, ch2 = 0;
+ int32_t i, inBytes;
+
+ /* Restore size of current sequence */
+ if (cnv->toUnicodeStatus && 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 (ch < 0x80) /* Simple case */
+ {
+ *(myTarget++) = (UChar) ch;
+ }
+ else
+ {
+ /* store the first char */
+ toUBytes[0] = (char)ch;
+ inBytes = bytesFromUTF8[ch]; /* lookup current sequence length */
+ i = 1;
+
+morebytes:
+ while (i < inBytes)
+ {
+ if (mySource < sourceLimit)
+ {
+ toUBytes[i] = (char) (ch2 = *mySource);
+ if (!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;
+ }
+ }
+
+ /* Remove the accumulated high bits */
+ ch -= offsetsFromUTF8[inBytes];
+
+ /*
+ * Legal UTF-8 byte sequences in Unicode 3.0.1 and up:
+ * - use only trail bytes after a lead byte (checked above)
+ * - use the right number of trail bytes for a given lead byte
+ * - encode a code point <= U+10ffff
+ * - use the fewest possible number of bytes for their code points
+ * - use at most 4 bytes (for i>=5 it is 0x10ffff<utf8_minChar32[])
+ *
+ * Starting with Unicode 3.2, surrogate code points must not be encoded in UTF-8.
+ * There are no irregular sequences any more.
+ * In CESU-8, only surrogates, not supplementary code points, are encoded directly.
+ */
+ if (i == inBytes && ch <= MAXIMUM_UTF && ch >= utf8_minChar32[i] &&
+ (isCESU8 ? i <= 3 : !U_IS_SURROGATE(ch)))
+ {
+ /* Normal valid byte when the loop has not prematurely terminated (i < inBytes) */
+ if (ch <= MAXIMUM_UCS2)
+ {
+ /* fits in 16 bits */
+ *(myTarget++) = (UChar) ch;
+ }
+ else
+ {
+ /* write out the surrogates */
+ ch -= HALF_BASE;
+ *(myTarget++) = (UChar) ((ch >> HALF_SHIFT) + SURROGATE_HIGH_START);
+ ch = (ch & HALF_MASK) + SURROGATE_LOW_START;
+ if (myTarget < targetLimit)
+ {
+ *(myTarget++) = (UChar)ch;
+ }
+ else
+ {
+ /* Put in overflow buffer (not handled here) */
+ cnv->UCharErrorBuffer[0] = (UChar) 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 ucnv_toUnicode_UTF8_OFFSETS_LOGIC (UConverterToUnicodeArgs * args,
+ UErrorCode * err)
+{
+ UConverter *cnv = args->converter;
+ const unsigned char *mySource = (unsigned char *) args->source;
+ UChar *myTarget = args->target;
+ int32_t *myOffsets = args->offsets;
+ int32_t offsetNum = 0;
+ const unsigned char *sourceLimit = (unsigned char *) args->sourceLimit;
+ const UChar *targetLimit = args->targetLimit;
+ unsigned char *toUBytes = cnv->toUBytes;
+ UBool isCESU8 = (UBool)(cnv->sharedData == &_CESU8Data);
+ uint32_t ch, ch2 = 0;
+ int32_t i, inBytes;
+
+ /* Restore size of current sequence */
+ if (cnv->toUnicodeStatus && 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 (ch < 0x80) /* Simple case */
+ {
+ *(myTarget++) = (UChar) ch;
+ *(myOffsets++) = offsetNum++;
+ }
+ else
+ {
+ toUBytes[0] = (char)ch;
+ inBytes = bytesFromUTF8[ch];
+ i = 1;
+
+morebytes:
+ while (i < inBytes)
+ {
+ if (mySource < sourceLimit)
+ {
+ toUBytes[i] = (char) (ch2 = *mySource);
+ if (!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;
+ }
+ }
+
+ /* Remove the accumulated high bits */
+ ch -= offsetsFromUTF8[inBytes];
+
+ /*
+ * Legal UTF-8 byte sequences in Unicode 3.0.1 and up:
+ * - use only trail bytes after a lead byte (checked above)
+ * - use the right number of trail bytes for a given lead byte
+ * - encode a code point <= U+10ffff
+ * - use the fewest possible number of bytes for their code points
+ * - use at most 4 bytes (for i>=5 it is 0x10ffff<utf8_minChar32[])
+ *
+ * Starting with Unicode 3.2, surrogate code points must not be encoded in UTF-8.
+ * There are no irregular sequences any more.
+ * In CESU-8, only surrogates, not supplementary code points, are encoded directly.
+ */
+ if (i == inBytes && ch <= MAXIMUM_UTF && ch >= utf8_minChar32[i] &&
+ (isCESU8 ? i <= 3 : !U_IS_SURROGATE(ch)))
+ {
+ /* Normal valid byte when the loop has not prematurely terminated (i < inBytes) */
+ if (ch <= MAXIMUM_UCS2)
+ {
+ /* fits in 16 bits */
+ *(myTarget++) = (UChar) ch;
+ *(myOffsets++) = offsetNum;
+ }
+ else
+ {
+ /* write out the surrogates */
+ ch -= HALF_BASE;
+ *(myTarget++) = (UChar) ((ch >> HALF_SHIFT) + SURROGATE_HIGH_START);
+ *(myOffsets++) = offsetNum;
+ ch = (ch & HALF_MASK) + SURROGATE_LOW_START;
+ if (myTarget < targetLimit)
+ {
+ *(myTarget++) = (UChar)ch;
+ *(myOffsets++) = offsetNum;
+ }
+ else
+ {
+ cnv->UCharErrorBuffer[0] = (UChar) 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_CFUNC void ucnv_fromUnicode_UTF8 (UConverterFromUnicodeArgs * args,
+ UErrorCode * err)
+{
+ UConverter *cnv = args->converter;
+ const UChar *mySource = args->source;
+ const UChar *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 = (UBool)(cnv->sharedData != &_CESU8Data);
+
+ 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 ucnv_fromUnicode_UTF8_OFFSETS_LOGIC (UConverterFromUnicodeArgs * args,
+ UErrorCode * err)
+{
+ UConverter *cnv = args->converter;
+ const UChar *mySource = args->source;
+ int32_t *myOffsets = args->offsets;
+ const UChar *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 = (UBool)(cnv->sharedData != &_CESU8Data);
+
+ 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;
+}
+
+static UChar32 ucnv_getNextUChar_UTF8(UConverterToUnicodeArgs *args,
+ UErrorCode *err) {
+ UConverter *cnv;
+ const uint8_t *sourceInitial;
+ const uint8_t *source;
+ uint16_t extraBytesToWrite;
+ uint8_t myByte;
+ UChar32 ch;
+ int8_t i, isLegalSequence;
+
+ /* 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 (myByte < 0x80)
+ {
+ args->source = (const char *)source;
+ return (UChar32)myByte;
+ }
+
+ extraBytesToWrite = (uint16_t)bytesFromUTF8[myByte];
+ if (extraBytesToWrite == 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 + extraBytesToWrite - 1) > args->sourceLimit)
+ {
+ /* check if all of the remaining bytes are trail bytes */
+ cnv->toUBytes[0] = myByte;
+ i = 1;
+ *err = U_TRUNCATED_CHAR_FOUND;
+ while(source < (const uint8_t *)args->sourceLimit) {
+ if(U8_IS_TRAIL(myByte = *source)) {
+ cnv->toUBytes[i++] = myByte;
+ ++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;
+ }
+
+ isLegalSequence = 1;
+ ch = myByte << 6;
+ switch(extraBytesToWrite)
+ {
+ /* note: code falls through cases! (sic)*/
+ case 6:
+ ch += (myByte = *source);
+ ch <<= 6;
+ if (!U8_IS_TRAIL(myByte))
+ {
+ isLegalSequence = 0;
+ break;
+ }
+ ++source;
+ case 5: /*fall through*/
+ ch += (myByte = *source);
+ ch <<= 6;
+ if (!U8_IS_TRAIL(myByte))
+ {
+ isLegalSequence = 0;
+ break;
+ }
+ ++source;
+ case 4: /*fall through*/
+ ch += (myByte = *source);
+ ch <<= 6;
+ if (!U8_IS_TRAIL(myByte))
+ {
+ isLegalSequence = 0;
+ break;
+ }
+ ++source;
+ case 3: /*fall through*/
+ ch += (myByte = *source);
+ ch <<= 6;
+ if (!U8_IS_TRAIL(myByte))
+ {
+ isLegalSequence = 0;
+ break;
+ }
+ ++source;
+ case 2: /*fall through*/
+ ch += (myByte = *source);
+ if (!U8_IS_TRAIL(myByte))
+ {
+ isLegalSequence = 0;
+ break;
+ }
+ ++source;
+ };
+ ch -= offsetsFromUTF8[extraBytesToWrite];
+ args->source = (const char *)source;
+
+ /*
+ * Legal UTF-8 byte sequences in Unicode 3.0.1 and up:
+ * - use only trail bytes after a lead byte (checked above)
+ * - use the right number of trail bytes for a given lead byte
+ * - encode a code point <= U+10ffff
+ * - use the fewest possible number of bytes for their code points
+ * - use at most 4 bytes (for i>=5 it is 0x10ffff<utf8_minChar32[])
+ *
+ * Starting with Unicode 3.2, surrogate code points must not be encoded in UTF-8.
+ * There are no irregular sequences any more.
+ */
+ if (isLegalSequence &&
+ (uint32_t)ch <= MAXIMUM_UTF &&
+ (uint32_t)ch >= utf8_minChar32[extraBytesToWrite] &&
+ !U_IS_SURROGATE(ch)
+ ) {
+ return ch; /* return the code point */
+ }
+
+ for(i = 0; sourceInitial < source; ++i) {
+ cnv->toUBytes[i] = *sourceInitial++;
+ }
+ cnv->toULength = i;
+ *err = U_ILLEGAL_CHAR_FOUND;
+ return 0xffff;
+}
+
+/* UTF-8-from-UTF-8 conversion functions ------------------------------------ */
+
+/* minimum code point values for n-byte UTF-8 sequences, n=0..4 */
+static const UChar32
+utf8_minLegal[5]={ 0, 0, 0x80, 0x800, 0x10000 };
+
+/* offsets for n-byte UTF-8 sequences that were calculated with ((lead<<6)+trail)<<6+trail... */
+static const UChar32
+utf8_offsets[7]={ 0, 0, 0x3080, 0xE2080, 0x3C82080 };
+
+/* "Convert" UTF-8 to UTF-8: Validate and copy. Modified from ucnv_DBCSFromUTF8(). */
+static void
+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 */
+ c=(UChar32)utf8->toUnicodeStatus;
+ if(c!=0) {
+ toULength=oldToULength=utf8->toULength;
+ toULimit=(int8_t)utf8->mode;
+ } else {
+ toULength=oldToULength=toULimit=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.
+ * As a result, the source length is checked only once per multi-byte
+ * character instead of twice.
+ *
+ * Make sure that the last byte sequence is complete, or else
+ * stop just before it.
+ * (The longest legal byte sequence has 3 trail bytes.)
+ * Count oldToULength (number of source bytes from a previous buffer)
+ * into the source length but reduce the source index by toULimit
+ * while going back over trail bytes in order to not go back into
+ * the bytes that will be read for finishing a partial
+ * sequence from the previous buffer.
+ * Let the standard converter handle edge cases.
+ */
+ int32_t i;
+
+ if(count>targetCapacity) {
+ count=targetCapacity;
+ }
+
+ i=0;
+ while(i<3 && i<(count-toULimit)) {
+ b=source[count-oldToULength-i-1];
+ if(U8_IS_TRAIL(b)) {
+ ++i;
+ } else {
+ if(i<U8_COUNT_TRAIL_BYTES(b)) {
+ /* stop converting before the lead byte if there are not enough trail bytes for it */
+ count-=i+1;
+ }
+ break;
+ }
+ }
+ }
+
+ 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((int8_t)b>=0) {
+ /* convert ASCII */
+ *target++=b;
+ --count;
+ continue;
+ } else {
+ if(b>0xe0) {
+ if( /* handle U+1000..U+D7FF inline */
+ (t1=source[0]) >= 0x80 && ((b<0xed && (t1 <= 0xbf)) ||
+ (b==0xed && (t1 <= 0x9f))) &&
+ (t2=source[1]) >= 0x80 && t2 <= 0xbf
+ ) {
+ source+=2;
+ *target++=b;
+ *target++=t1;
+ *target++=t2;
+ count-=3;
+ continue;
+ }
+ } else if(b<0xe0) {
+ if( /* handle U+0080..U+07FF inline */
+ b>=0xc2 &&
+ (t1=*source) >= 0x80 && t1 <= 0xbf
+ ) {
+ ++source;
+ *target++=b;
+ *target++=t1;
+ count-=2;
+ continue;
+ }
+ } else if(b==0xe0) {
+ if( /* handle U+0800..U+0FFF inline */
+ (t1=source[0]) >= 0xa0 && t1 <= 0xbf &&
+ (t2=source[1]) >= 0x80 && t2 <= 0xbf
+ ) {
+ source+=2;
+ *target++=b;
+ *target++=t1;
+ *target++=t2;
+ count-=3;
+ continue;
+ }
+ }
+
+ /* handle "complicated" and error cases, and continuing partial characters */
+ oldToULength=0;
+ toULength=1;
+ toULimit=U8_COUNT_TRAIL_BYTES(b)+1;
+ c=b;
+moreBytes:
+ while(toULength<toULimit) {
+ if(source<sourceLimit) {
+ b=*source;
+ if(U8_IS_TRAIL(b)) {
+ ++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 && /* consumed all trail bytes */
+ (toULength==3 || toULength==2) && /* BMP */
+ (c-=utf8_offsets[toULength])>=utf8_minLegal[toULength] &&
+ (c<=0xd7ff || 0xe000<=c) /* not a surrogate */
+ ) {
+ /* legal byte sequence for BMP code point */
+ } else if(
+ toULength==toULimit && toULength==4 &&
+ (0x10000<=(c-=utf8_offsets[4]) && c<=0x10ffff)
+ ) {
+ /* legal byte sequence for supplementary code point */
+ } else {
+ /* 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;
+ }
+ }
+ }
+
+ if(U_SUCCESS(*pErrorCode) && source<sourceLimit) {
+ if(target==(const uint8_t *)pFromUArgs->targetLimit) {
+ *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
+ } else {
+ b=*source;
+ toULimit=U8_COUNT_TRAIL_BYTES(b)+1;
+ 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(!U8_IS_TRAIL(b=*source)) {
+ /* lead byte in trail byte position */
+ 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;
+}
+
+/* UTF-8 converter data ----------------------------------------------------- */
+
+static const UConverterImpl _UTF8Impl={
+ UCNV_UTF8,
+
+ NULL,
+ NULL,
+
+ NULL,
+ NULL,
+ NULL,
+
+ ucnv_toUnicode_UTF8,
+ ucnv_toUnicode_UTF8_OFFSETS_LOGIC,
+ ucnv_fromUnicode_UTF8,
+ ucnv_fromUnicode_UTF8_OFFSETS_LOGIC,
+ ucnv_getNextUChar_UTF8,
+
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ 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 UChar 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={
+ sizeof(UConverterSharedData), ~((uint32_t) 0),
+ NULL, NULL, &_UTF8StaticData, FALSE, &_UTF8Impl,
+ 0
+};
+
+/* CESU-8 converter data ---------------------------------------------------- */
+
+static const UConverterImpl _CESU8Impl={
+ UCNV_CESU8,
+
+ NULL,
+ NULL,
+
+ NULL,
+ NULL,
+ NULL,
+
+ ucnv_toUnicode_UTF8,
+ ucnv_toUnicode_UTF8_OFFSETS_LOGIC,
+ ucnv_fromUnicode_UTF8,
+ ucnv_fromUnicode_UTF8_OFFSETS_LOGIC,
+ NULL,
+
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ ucnv_getCompleteUnicodeSet
+};
+
+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={
+ sizeof(UConverterSharedData), ~((uint32_t) 0),
+ NULL, NULL, &_CESU8StaticData, FALSE, &_CESU8Impl,
+ 0
+};
+
+#endif
Property changes on: icu51/source/common/ucnv_u8.c
___________________________________________________________________
Added: svn:eol-style
+ LF
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