Source/WTF/wtf/unicode/UTF8.cpp - Issue 14238015: Move Source/WTF/wtf to Source/wtf

Unified Diff: Source/WTF/wtf/unicode/UTF8.cpp

Issue 14238015: Move Source/WTF/wtf to Source/wtf (Closed) Base URL: svn://svn.chromium.org/blink/trunk

Patch Set: Created 7 years, 8 months ago

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Index: Source/WTF/wtf/unicode/UTF8.cpp

diff --git a/Source/WTF/wtf/unicode/UTF8.cpp b/Source/WTF/wtf/unicode/UTF8.cpp

deleted file mode 100644

index 6e74f01cc92c6b221ef5b2b4e62b3f59cdeba0a6..0000000000000000000000000000000000000000

--- a/Source/WTF/wtf/unicode/UTF8.cpp

+++ /dev/null

@@ -1,460 +0,0 @@

-/*

- *

- * 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 convertLatin1ToUTF8(

- const LChar** sourceStart, const LChar* sourceEnd,

- char** targetStart, char* targetEnd)

- ConversionResult result = conversionOK;

- const LChar* source = *sourceStart;

- char* target = *targetStart;

- while (source < sourceEnd) {

- UChar32 ch;

- unsigned short bytesToWrite = 0;

- const UChar32 byteMask = 0xBF;

- const UChar32 byteMark = 0x80;

- const LChar* oldSource = source; // In case we have to back up because of target overflow.

- ch = static_cast<unsigned short>(*source++);

- // Figure out how many bytes the result will require

- if (ch < (UChar32)0x80)

- bytesToWrite = 1;

- else

- bytesToWrite = 2;

- target += bytesToWrite;

- if (target > targetEnd) {

- source = oldSource; // Back up source pointer!

- target -= bytesToWrite;

- result = targetExhausted;

- break;

- }

- switch (bytesToWrite) { // note: everything falls through.

- case 2:

- *--target = (char)((ch | byteMark) & byteMask);

- ch >>= 6;

- case 1:

- *--target = (char)(ch | firstByteMark[bytesToWrite]);

- }

- target += bytesToWrite;

- }

- *sourceStart = source;

- *targetStart = target;

- return result;

-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, static_cast<UChar32>(0xFA082080UL), static_cast<UChar32>(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* sourceAllASCII, bool strict)

- ConversionResult result = conversionOK;

- const char* source = *sourceStart;

- UChar* target = *targetStart;

- UChar orAllData = 0;

- 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;

- orAllData |= replacementCharacter;

- }

- } else {

- *target++ = character; // normal case

- orAllData |= character;

- }

- } 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);

- orAllData = 0xffff;

- } else {

- if (strict) {

- source -= utf8SequenceLength; // return to the start

- result = sourceIllegal;

- break; // Bail out; shouldn't continue

- } else {

- *target++ = replacementCharacter;

- orAllData |= replacementCharacter;

- }

- *sourceStart = source;

- *targetStart = target;

- if (sourceAllASCII)

- *sourceAllASCII = !(orAllData & ~0x7f);

- return result;

-unsigned calculateStringHashAndLengthFromUTF8MaskingTop8Bits(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.hashWithTop8BitsMasked();

-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

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