+++ /dev/null
-/*
- * Copyright (C) 2007 Apple Inc. All rights reserved.
- * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "UTF8.h"
-
-#include "ASCIICType.h"
-#include <wtf/StringHasher.h>
-#include <wtf/unicode/CharacterNames.h>
-
-namespace WTF {
-namespace Unicode {
-
-inline int inlineUTF8SequenceLengthNonASCII(char b0)
-{
- if ((b0 & 0xC0) != 0xC0)
- return 0;
- if ((b0 & 0xE0) == 0xC0)
- return 2;
- if ((b0 & 0xF0) == 0xE0)
- return 3;
- if ((b0 & 0xF8) == 0xF0)
- return 4;
- return 0;
-}
-
-inline int inlineUTF8SequenceLength(char b0)
-{
- return isASCII(b0) ? 1 : inlineUTF8SequenceLengthNonASCII(b0);
-}
-
-int UTF8SequenceLength(char b0)
-{
- return isASCII(b0) ? 1 : inlineUTF8SequenceLengthNonASCII(b0);
-}
-
-int decodeUTF8Sequence(const char* sequence)
-{
- // Handle 0-byte sequences (never valid).
- const unsigned char b0 = sequence[0];
- const int length = inlineUTF8SequenceLength(b0);
- if (length == 0)
- return -1;
-
- // Handle 1-byte sequences (plain ASCII).
- const unsigned char b1 = sequence[1];
- if (length == 1) {
- if (b1)
- return -1;
- return b0;
- }
-
- // Handle 2-byte sequences.
- if ((b1 & 0xC0) != 0x80)
- return -1;
- const unsigned char b2 = sequence[2];
- if (length == 2) {
- if (b2)
- return -1;
- const int c = ((b0 & 0x1F) << 6) | (b1 & 0x3F);
- if (c < 0x80)
- return -1;
- return c;
- }
-
- // Handle 3-byte sequences.
- if ((b2 & 0xC0) != 0x80)
- return -1;
- const unsigned char b3 = sequence[3];
- if (length == 3) {
- if (b3)
- return -1;
- const int c = ((b0 & 0xF) << 12) | ((b1 & 0x3F) << 6) | (b2 & 0x3F);
- if (c < 0x800)
- return -1;
- // UTF-16 surrogates should never appear in UTF-8 data.
- if (c >= 0xD800 && c <= 0xDFFF)
- return -1;
- return c;
- }
-
- // Handle 4-byte sequences.
- if ((b3 & 0xC0) != 0x80)
- return -1;
- const unsigned char b4 = sequence[4];
- if (length == 4) {
- if (b4)
- return -1;
- const int c = ((b0 & 0x7) << 18) | ((b1 & 0x3F) << 12) | ((b2 & 0x3F) << 6) | (b3 & 0x3F);
- if (c < 0x10000 || c > 0x10FFFF)
- return -1;
- return c;
- }
-
- return -1;
-}
-
-// Once the bits are split out into bytes of UTF-8, this is a mask OR-ed
-// into the first byte, depending on how many bytes follow. There are
-// as many entries in this table as there are UTF-8 sequence types.
-// (I.e., one byte sequence, two byte... etc.). Remember that sequencs
-// for *legal* UTF-8 will be 4 or fewer bytes total.
-static const unsigned char firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
-
-ConversionResult convertUTF16ToUTF8(
- const UChar** sourceStart, const UChar* sourceEnd,
- char** targetStart, char* targetEnd, bool strict)
-{
- ConversionResult result = conversionOK;
- const UChar* source = *sourceStart;
- char* target = *targetStart;
- while (source < sourceEnd) {
- UChar32 ch;
- unsigned short bytesToWrite = 0;
- const UChar32 byteMask = 0xBF;
- const UChar32 byteMark = 0x80;
- const UChar* oldSource = source; // In case we have to back up because of target overflow.
- ch = static_cast<unsigned short>(*source++);
- // If we have a surrogate pair, convert to UChar32 first.
- if (ch >= 0xD800 && ch <= 0xDBFF) {
- // If the 16 bits following the high surrogate are in the source buffer...
- if (source < sourceEnd) {
- UChar32 ch2 = static_cast<unsigned short>(*source);
- // If it's a low surrogate, convert to UChar32.
- if (ch2 >= 0xDC00 && ch2 <= 0xDFFF) {
- ch = ((ch - 0xD800) << 10) + (ch2 - 0xDC00) + 0x0010000;
- ++source;
- } else if (strict) { // it's an unpaired high surrogate
- --source; // return to the illegal value itself
- result = sourceIllegal;
- break;
- }
- } else { // We don't have the 16 bits following the high surrogate.
- --source; // return to the high surrogate
- result = sourceExhausted;
- break;
- }
- } else if (strict) {
- // UTF-16 surrogate values are illegal in UTF-32
- if (ch >= 0xDC00 && ch <= 0xDFFF) {
- --source; // return to the illegal value itself
- result = sourceIllegal;
- break;
- }
- }
- // Figure out how many bytes the result will require
- if (ch < (UChar32)0x80) {
- bytesToWrite = 1;
- } else if (ch < (UChar32)0x800) {
- bytesToWrite = 2;
- } else if (ch < (UChar32)0x10000) {
- bytesToWrite = 3;
- } else if (ch < (UChar32)0x110000) {
- bytesToWrite = 4;
- } else {
- bytesToWrite = 3;
- ch = replacementCharacter;
- }
-
- target += bytesToWrite;
- if (target > targetEnd) {
- source = oldSource; // Back up source pointer!
- target -= bytesToWrite;
- result = targetExhausted;
- break;
- }
- switch (bytesToWrite) { // note: everything falls through.
- case 4: *--target = (char)((ch | byteMark) & byteMask); ch >>= 6;
- case 3: *--target = (char)((ch | byteMark) & byteMask); ch >>= 6;
- case 2: *--target = (char)((ch | byteMark) & byteMask); ch >>= 6;
- case 1: *--target = (char)(ch | firstByteMark[bytesToWrite]);
- }
- target += bytesToWrite;
- }
- *sourceStart = source;
- *targetStart = target;
- return result;
-}
-
-// This must be called with the length pre-determined by the first byte.
-// If presented with a length > 4, this returns false. The Unicode
-// definition of UTF-8 goes up to 4-byte sequences.
-static bool isLegalUTF8(const unsigned char* source, int length)
-{
- unsigned char a;
- const unsigned char* srcptr = source + length;
- switch (length) {
- default: return false;
- // Everything else falls through when "true"...
- case 4: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
- case 3: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
- case 2: if ((a = (*--srcptr)) > 0xBF) return false;
-
- switch (*source) {
- // no fall-through in this inner switch
- case 0xE0: if (a < 0xA0) return false; break;
- case 0xED: if (a > 0x9F) return false; break;
- case 0xF0: if (a < 0x90) return false; break;
- case 0xF4: if (a > 0x8F) return false; break;
- default: if (a < 0x80) return false;
- }
-
- case 1: if (*source >= 0x80 && *source < 0xC2) return false;
- }
- if (*source > 0xF4)
- return false;
- return true;
-}
-
-// Magic values subtracted from a buffer value during UTF8 conversion.
-// This table contains as many values as there might be trailing bytes
-// in a UTF-8 sequence.
-static const UChar32 offsetsFromUTF8[6] = { 0x00000000UL, 0x00003080UL, 0x000E2080UL,
- 0x03C82080UL, 0xFA082080UL, 0x82082080UL };
-
-static inline UChar32 readUTF8Sequence(const char*& sequence, unsigned length)
-{
- UChar32 character = 0;
-
- // The cases all fall through.
- switch (length) {
- case 6: character += static_cast<unsigned char>(*sequence++); character <<= 6;
- case 5: character += static_cast<unsigned char>(*sequence++); character <<= 6;
- case 4: character += static_cast<unsigned char>(*sequence++); character <<= 6;
- case 3: character += static_cast<unsigned char>(*sequence++); character <<= 6;
- case 2: character += static_cast<unsigned char>(*sequence++); character <<= 6;
- case 1: character += static_cast<unsigned char>(*sequence++);
- }
-
- return character - offsetsFromUTF8[length - 1];
-}
-
-ConversionResult convertUTF8ToUTF16(
- const char** sourceStart, const char* sourceEnd,
- UChar** targetStart, UChar* targetEnd, bool strict)
-{
- ConversionResult result = conversionOK;
- const char* source = *sourceStart;
- UChar* target = *targetStart;
- while (source < sourceEnd) {
- int utf8SequenceLength = inlineUTF8SequenceLength(*source);
- if (sourceEnd - source < utf8SequenceLength) {
- result = sourceExhausted;
- break;
- }
- // Do this check whether lenient or strict
- if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(source), utf8SequenceLength)) {
- result = sourceIllegal;
- break;
- }
-
- UChar32 character = readUTF8Sequence(source, utf8SequenceLength);
-
- if (target >= targetEnd) {
- source -= utf8SequenceLength; // Back up source pointer!
- result = targetExhausted;
- break;
- }
-
- if (U_IS_BMP(character)) {
- // UTF-16 surrogate values are illegal in UTF-32
- if (U_IS_SURROGATE(character)) {
- if (strict) {
- source -= utf8SequenceLength; // return to the illegal value itself
- result = sourceIllegal;
- break;
- } else
- *target++ = replacementCharacter;
- } else
- *target++ = character; // normal case
- } else if (U_IS_SUPPLEMENTARY(character)) {
- // target is a character in range 0xFFFF - 0x10FFFF
- if (target + 1 >= targetEnd) {
- source -= utf8SequenceLength; // Back up source pointer!
- result = targetExhausted;
- break;
- }
- *target++ = U16_LEAD(character);
- *target++ = U16_TRAIL(character);
- } else {
- if (strict) {
- source -= utf8SequenceLength; // return to the start
- result = sourceIllegal;
- break; // Bail out; shouldn't continue
- } else
- *target++ = replacementCharacter;
- }
- }
- *sourceStart = source;
- *targetStart = target;
- return result;
-}
-
-unsigned calculateStringHashAndLengthFromUTF8(const char* data, const char* dataEnd, unsigned& dataLength, unsigned& utf16Length)
-{
- if (!data)
- return 0;
-
- StringHasher stringHasher;
- dataLength = 0;
- utf16Length = 0;
-
- while (data < dataEnd || (!dataEnd && *data)) {
- if (isASCII(*data)) {
- stringHasher.addCharacter(*data++);
- dataLength++;
- utf16Length++;
- continue;
- }
-
- int utf8SequenceLength = inlineUTF8SequenceLengthNonASCII(*data);
- dataLength += utf8SequenceLength;
-
- if (!dataEnd) {
- for (int i = 1; i < utf8SequenceLength; ++i) {
- if (!data[i])
- return 0;
- }
- } else if (dataEnd - data < utf8SequenceLength)
- return 0;
-
- if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(data), utf8SequenceLength))
- return 0;
-
- UChar32 character = readUTF8Sequence(data, utf8SequenceLength);
- ASSERT(!isASCII(character));
-
- if (U_IS_BMP(character)) {
- // UTF-16 surrogate values are illegal in UTF-32
- if (U_IS_SURROGATE(character))
- return 0;
- stringHasher.addCharacter(static_cast<UChar>(character)); // normal case
- utf16Length++;
- } else if (U_IS_SUPPLEMENTARY(character)) {
- stringHasher.addCharacters(static_cast<UChar>(U16_LEAD(character)),
- static_cast<UChar>(U16_TRAIL(character)));
- utf16Length += 2;
- } else
- return 0;
- }
-
- return stringHasher.hash();
-}
-
-bool equalUTF16WithUTF8(const UChar* a, const UChar* aEnd, const char* b, const char* bEnd)
-{
- while (b < bEnd) {
- if (isASCII(*b)) {
- if (*a++ != *b++)
- return false;
- continue;
- }
-
- int utf8SequenceLength = inlineUTF8SequenceLengthNonASCII(*b);
-
- if (bEnd - b < utf8SequenceLength)
- return false;
-
- if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(b), utf8SequenceLength))
- return 0;
-
- UChar32 character = readUTF8Sequence(b, utf8SequenceLength);
- ASSERT(!isASCII(character));
-
- if (U_IS_BMP(character)) {
- // UTF-16 surrogate values are illegal in UTF-32
- if (U_IS_SURROGATE(character))
- return false;
- if (*a++ != character)
- return false;
- } else if (U_IS_SUPPLEMENTARY(character)) {
- if (*a++ != U16_LEAD(character))
- return false;
- if (*a++ != U16_TRAIL(character))
- return false;
- } else
- return false;
- }
-
- return a == aEnd;
-}
-
-} // namespace Unicode
-} // namespace WTF
projects / apple / javascriptcore.git / blobdiff