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1087 lines
36 KiB
C
1087 lines
36 KiB
C
/*
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**********************************************************************
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* Copyright (C) 2002-2012, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* file name: ucnv_u8.c
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2002jul01
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* created by: Markus W. Scherer
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*
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* UTF-8 converter implementation. Used to be in ucnv_utf.c.
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*
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* Also, CESU-8 implementation, see UTR 26.
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* The CESU-8 converter uses all the same functions as the
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* UTF-8 converter, with a branch for converting supplementary code points.
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_CONVERSION
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#include "unicode/ucnv.h"
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#include "unicode/utf.h"
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#include "unicode/utf8.h"
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#include "unicode/utf16.h"
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#include "ucnv_bld.h"
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#include "ucnv_cnv.h"
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#include "cmemory.h"
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/* Prototypes --------------------------------------------------------------- */
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/* Keep these here to make finicky compilers happy */
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U_CFUNC void ucnv_fromUnicode_UTF8(UConverterFromUnicodeArgs *args,
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UErrorCode *err);
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U_CFUNC void ucnv_fromUnicode_UTF8_OFFSETS_LOGIC(UConverterFromUnicodeArgs *args,
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UErrorCode *err);
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/* UTF-8 -------------------------------------------------------------------- */
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/* UTF-8 Conversion DATA
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* for more information see Unicode Standard 2.0, Transformation Formats Appendix A-9
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*/
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/*static const uint32_t REPLACEMENT_CHARACTER = 0x0000FFFD;*/
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#define MAXIMUM_UCS2 0x0000FFFF
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#define MAXIMUM_UTF 0x0010FFFF
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#define MAXIMUM_UCS4 0x7FFFFFFF
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#define HALF_SHIFT 10
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#define HALF_BASE 0x0010000
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#define HALF_MASK 0x3FF
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#define SURROGATE_HIGH_START 0xD800
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#define SURROGATE_HIGH_END 0xDBFF
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#define SURROGATE_LOW_START 0xDC00
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#define SURROGATE_LOW_END 0xDFFF
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/* -SURROGATE_LOW_START + HALF_BASE */
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#define SURROGATE_LOW_BASE 9216
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static const uint32_t offsetsFromUTF8[7] = {0,
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(uint32_t) 0x00000000, (uint32_t) 0x00003080, (uint32_t) 0x000E2080,
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(uint32_t) 0x03C82080, (uint32_t) 0xFA082080, (uint32_t) 0x82082080
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};
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/* END OF UTF-8 Conversion DATA */
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static const int8_t bytesFromUTF8[256] = {
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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,
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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,
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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,
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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,
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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,
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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,
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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,
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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
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};
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/*
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* Starting with Unicode 3.0.1:
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* UTF-8 byte sequences of length N _must_ encode code points of or above utf8_minChar32[N];
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* byte sequences with more than 4 bytes are illegal in UTF-8,
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* which is tested with impossible values for them
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*/
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static const uint32_t
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utf8_minChar32[7]={ 0, 0, 0x80, 0x800, 0x10000, 0xffffffff, 0xffffffff };
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static void ucnv_toUnicode_UTF8 (UConverterToUnicodeArgs * args,
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UErrorCode * err)
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{
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UConverter *cnv = args->converter;
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const unsigned char *mySource = (unsigned char *) args->source;
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UChar *myTarget = args->target;
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const unsigned char *sourceLimit = (unsigned char *) args->sourceLimit;
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const UChar *targetLimit = args->targetLimit;
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unsigned char *toUBytes = cnv->toUBytes;
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UBool isCESU8 = (UBool)(cnv->sharedData == &_CESU8Data);
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uint32_t ch, ch2 = 0;
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int32_t i, inBytes;
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/* Restore size of current sequence */
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if (cnv->toUnicodeStatus && myTarget < targetLimit)
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{
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inBytes = cnv->mode; /* restore # of bytes to consume */
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i = cnv->toULength; /* restore # of bytes consumed */
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cnv->toULength = 0;
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ch = cnv->toUnicodeStatus;/*Stores the previously calculated ch from a previous call*/
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cnv->toUnicodeStatus = 0;
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goto morebytes;
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}
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while (mySource < sourceLimit && myTarget < targetLimit)
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{
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ch = *(mySource++);
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if (ch < 0x80) /* Simple case */
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{
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*(myTarget++) = (UChar) ch;
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}
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else
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{
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/* store the first char */
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toUBytes[0] = (char)ch;
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inBytes = bytesFromUTF8[ch]; /* lookup current sequence length */
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i = 1;
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morebytes:
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while (i < inBytes)
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{
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if (mySource < sourceLimit)
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{
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toUBytes[i] = (char) (ch2 = *mySource);
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if (!U8_IS_TRAIL(ch2))
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{
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break; /* i < inBytes */
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}
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ch = (ch << 6) + ch2;
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++mySource;
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i++;
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}
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else
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{
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/* stores a partially calculated target*/
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cnv->toUnicodeStatus = ch;
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cnv->mode = inBytes;
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cnv->toULength = (int8_t) i;
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goto donefornow;
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}
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}
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/* Remove the accumulated high bits */
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ch -= offsetsFromUTF8[inBytes];
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/*
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* Legal UTF-8 byte sequences in Unicode 3.0.1 and up:
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* - use only trail bytes after a lead byte (checked above)
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* - use the right number of trail bytes for a given lead byte
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* - encode a code point <= U+10ffff
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* - use the fewest possible number of bytes for their code points
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* - use at most 4 bytes (for i>=5 it is 0x10ffff<utf8_minChar32[])
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*
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* Starting with Unicode 3.2, surrogate code points must not be encoded in UTF-8.
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* There are no irregular sequences any more.
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* In CESU-8, only surrogates, not supplementary code points, are encoded directly.
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*/
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if (i == inBytes && ch <= MAXIMUM_UTF && ch >= utf8_minChar32[i] &&
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(isCESU8 ? i <= 3 : !U_IS_SURROGATE(ch)))
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{
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/* Normal valid byte when the loop has not prematurely terminated (i < inBytes) */
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if (ch <= MAXIMUM_UCS2)
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{
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/* fits in 16 bits */
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*(myTarget++) = (UChar) ch;
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}
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else
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{
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/* write out the surrogates */
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ch -= HALF_BASE;
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*(myTarget++) = (UChar) ((ch >> HALF_SHIFT) + SURROGATE_HIGH_START);
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ch = (ch & HALF_MASK) + SURROGATE_LOW_START;
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if (myTarget < targetLimit)
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{
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*(myTarget++) = (UChar)ch;
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}
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else
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{
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/* Put in overflow buffer (not handled here) */
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cnv->UCharErrorBuffer[0] = (UChar) ch;
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cnv->UCharErrorBufferLength = 1;
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*err = U_BUFFER_OVERFLOW_ERROR;
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break;
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}
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}
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}
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else
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{
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cnv->toULength = (int8_t)i;
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*err = U_ILLEGAL_CHAR_FOUND;
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break;
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}
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}
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}
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donefornow:
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if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err))
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{
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/* End of target buffer */
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*err = U_BUFFER_OVERFLOW_ERROR;
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}
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args->target = myTarget;
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args->source = (const char *) mySource;
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}
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static void ucnv_toUnicode_UTF8_OFFSETS_LOGIC (UConverterToUnicodeArgs * args,
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UErrorCode * err)
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{
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UConverter *cnv = args->converter;
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const unsigned char *mySource = (unsigned char *) args->source;
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UChar *myTarget = args->target;
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int32_t *myOffsets = args->offsets;
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int32_t offsetNum = 0;
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const unsigned char *sourceLimit = (unsigned char *) args->sourceLimit;
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const UChar *targetLimit = args->targetLimit;
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unsigned char *toUBytes = cnv->toUBytes;
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UBool isCESU8 = (UBool)(cnv->sharedData == &_CESU8Data);
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uint32_t ch, ch2 = 0;
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int32_t i, inBytes;
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/* Restore size of current sequence */
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if (cnv->toUnicodeStatus && myTarget < targetLimit)
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{
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inBytes = cnv->mode; /* restore # of bytes to consume */
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i = cnv->toULength; /* restore # of bytes consumed */
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cnv->toULength = 0;
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ch = cnv->toUnicodeStatus;/*Stores the previously calculated ch from a previous call*/
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cnv->toUnicodeStatus = 0;
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goto morebytes;
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}
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while (mySource < sourceLimit && myTarget < targetLimit)
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{
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ch = *(mySource++);
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if (ch < 0x80) /* Simple case */
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{
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*(myTarget++) = (UChar) ch;
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*(myOffsets++) = offsetNum++;
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}
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else
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{
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toUBytes[0] = (char)ch;
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inBytes = bytesFromUTF8[ch];
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i = 1;
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morebytes:
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while (i < inBytes)
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{
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if (mySource < sourceLimit)
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{
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toUBytes[i] = (char) (ch2 = *mySource);
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if (!U8_IS_TRAIL(ch2))
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{
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break; /* i < inBytes */
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}
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ch = (ch << 6) + ch2;
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++mySource;
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i++;
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}
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else
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{
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cnv->toUnicodeStatus = ch;
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cnv->mode = inBytes;
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cnv->toULength = (int8_t)i;
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goto donefornow;
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}
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}
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/* Remove the accumulated high bits */
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ch -= offsetsFromUTF8[inBytes];
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/*
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* Legal UTF-8 byte sequences in Unicode 3.0.1 and up:
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* - use only trail bytes after a lead byte (checked above)
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* - use the right number of trail bytes for a given lead byte
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|
* - encode a code point <= U+10ffff
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|
* - use the fewest possible number of bytes for their code points
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* - use at most 4 bytes (for i>=5 it is 0x10ffff<utf8_minChar32[])
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*
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* Starting with Unicode 3.2, surrogate code points must not be encoded in UTF-8.
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* There are no irregular sequences any more.
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* In CESU-8, only surrogates, not supplementary code points, are encoded directly.
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*/
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if (i == inBytes && ch <= MAXIMUM_UTF && ch >= utf8_minChar32[i] &&
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(isCESU8 ? i <= 3 : !U_IS_SURROGATE(ch)))
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{
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/* Normal valid byte when the loop has not prematurely terminated (i < inBytes) */
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if (ch <= MAXIMUM_UCS2)
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{
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/* fits in 16 bits */
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*(myTarget++) = (UChar) ch;
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*(myOffsets++) = offsetNum;
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}
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else
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{
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/* write out the surrogates */
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ch -= HALF_BASE;
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*(myTarget++) = (UChar) ((ch >> HALF_SHIFT) + SURROGATE_HIGH_START);
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*(myOffsets++) = offsetNum;
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ch = (ch & HALF_MASK) + SURROGATE_LOW_START;
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if (myTarget < targetLimit)
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{
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*(myTarget++) = (UChar)ch;
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*(myOffsets++) = offsetNum;
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}
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else
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{
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cnv->UCharErrorBuffer[0] = (UChar) ch;
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cnv->UCharErrorBufferLength = 1;
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*err = U_BUFFER_OVERFLOW_ERROR;
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}
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}
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offsetNum += i;
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}
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else
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{
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cnv->toULength = (int8_t)i;
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*err = U_ILLEGAL_CHAR_FOUND;
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break;
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}
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}
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}
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donefornow:
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if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err))
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{ /* End of target buffer */
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*err = U_BUFFER_OVERFLOW_ERROR;
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}
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args->target = myTarget;
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args->source = (const char *) mySource;
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args->offsets = myOffsets;
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}
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U_CFUNC void ucnv_fromUnicode_UTF8 (UConverterFromUnicodeArgs * args,
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UErrorCode * err)
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{
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UConverter *cnv = args->converter;
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const UChar *mySource = args->source;
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const UChar *sourceLimit = args->sourceLimit;
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uint8_t *myTarget = (uint8_t *) args->target;
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const uint8_t *targetLimit = (uint8_t *) args->targetLimit;
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uint8_t *tempPtr;
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UChar32 ch;
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uint8_t tempBuf[4];
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int32_t indexToWrite;
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UBool isNotCESU8 = (UBool)(cnv->sharedData != &_CESU8Data);
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if (cnv->fromUChar32 && myTarget < targetLimit)
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{
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ch = cnv->fromUChar32;
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cnv->fromUChar32 = 0;
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goto lowsurrogate;
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}
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while (mySource < sourceLimit && myTarget < targetLimit)
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{
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ch = *(mySource++);
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if (ch < 0x80) /* Single byte */
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{
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*(myTarget++) = (uint8_t) ch;
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}
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else if (ch < 0x800) /* Double byte */
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{
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*(myTarget++) = (uint8_t) ((ch >> 6) | 0xc0);
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if (myTarget < targetLimit)
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{
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*(myTarget++) = (uint8_t) ((ch & 0x3f) | 0x80);
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}
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else
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{
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cnv->charErrorBuffer[0] = (uint8_t) ((ch & 0x3f) | 0x80);
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cnv->charErrorBufferLength = 1;
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*err = U_BUFFER_OVERFLOW_ERROR;
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}
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}
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else {
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/* Check for surrogates */
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if(U16_IS_SURROGATE(ch) && isNotCESU8) {
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lowsurrogate:
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if (mySource < sourceLimit) {
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/* test both code units */
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if(U16_IS_SURROGATE_LEAD(ch) && U16_IS_TRAIL(*mySource)) {
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/* convert and consume this supplementary code point */
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ch=U16_GET_SUPPLEMENTARY(ch, *mySource);
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++mySource;
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/* exit this condition tree */
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}
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else {
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/* this is an unpaired trail or lead code unit */
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/* callback(illegal) */
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cnv->fromUChar32 = ch;
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*err = U_ILLEGAL_CHAR_FOUND;
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break;
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}
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}
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else {
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/* no more input */
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cnv->fromUChar32 = ch;
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break;
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}
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}
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|
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/* Do we write the buffer directly for speed,
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or do we have to be careful about target buffer space? */
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tempPtr = (((targetLimit - myTarget) >= 4) ? myTarget : tempBuf);
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|
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if (ch <= MAXIMUM_UCS2) {
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indexToWrite = 2;
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tempPtr[0] = (uint8_t) ((ch >> 12) | 0xe0);
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}
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else {
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indexToWrite = 3;
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tempPtr[0] = (uint8_t) ((ch >> 18) | 0xf0);
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tempPtr[1] = (uint8_t) (((ch >> 12) & 0x3f) | 0x80);
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}
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tempPtr[indexToWrite-1] = (uint8_t) (((ch >> 6) & 0x3f) | 0x80);
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tempPtr[indexToWrite] = (uint8_t) ((ch & 0x3f) | 0x80);
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|
|
|
if (tempPtr == myTarget) {
|
|
/* There was enough space to write the codepoint directly. */
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|
myTarget += (indexToWrite + 1);
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|
}
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|
else {
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|
/* We might run out of room soon. Write it slowly. */
|
|
for (; tempPtr <= (tempBuf + indexToWrite); tempPtr++) {
|
|
if (myTarget < targetLimit) {
|
|
*(myTarget++) = *tempPtr;
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|
}
|
|
else {
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cnv->charErrorBuffer[cnv->charErrorBufferLength++] = *tempPtr;
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*err = U_BUFFER_OVERFLOW_ERROR;
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}
|
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}
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}
|
|
}
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|
}
|
|
|
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if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err))
|
|
{
|
|
*err = U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
|
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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
|