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/*
* Copyright (C) 2007-2019 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 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 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 <wtf/unicode/UTF8Conversion.h>
#include <wtf/ASCIICType.h>
#include <wtf/text/StringHasher.h>
#include <wtf/unicode/CharacterNames.h>
namespace WTF {
namespace Unicode {
bool convertLatin1ToUTF8(const LChar** sourceStart, const LChar* sourceEnd, char** targetStart, char* targetEnd)
{
const LChar* source;
char* target = *targetStart;
int i = 0;
for (source = *sourceStart; source < sourceEnd; ++source) {
UBool sawError = false;
// Work around bug in either Windows compiler or old version of ICU, where passing a uint8_t to
// U8_APPEND warns, by converting from uint8_t to a wider type.
UChar32 character = *source;
U8_APPEND(reinterpret_cast<uint8_t*>(target), i, targetEnd - *targetStart, character, sawError);
if (sawError)
return false;
}
*sourceStart = source;
*targetStart = target + i;
return true;
}
ConversionResult convertUTF16ToUTF8(const UChar** sourceStart, const UChar* sourceEnd, char** targetStart, char* targetEnd, bool strict)
{
ConversionResult result = ConversionOK;
const UChar* source = *sourceStart;
char* target = *targetStart;
UBool sawError = false;
int i = 0;
while (source < sourceEnd) {
UChar32 ch;
int j = 0;
U16_NEXT(source, j, sourceEnd - source, ch);
if (U_IS_SURROGATE(ch)) {
if (source + j == sourceEnd && U_IS_SURROGATE_LEAD(ch)) {
result = SourceExhausted;
break;
}
if (strict) {
result = SourceIllegal;
break;
}
ch = replacementCharacter;
}
U8_APPEND(reinterpret_cast<uint8_t*>(target), i, targetEnd - target, ch, sawError);
if (sawError) {
result = TargetExhausted;
break;
}
source += j;
}
*sourceStart = source;
*targetStart = target + i;
return result;
}
template<bool replaceInvalidSequences>
bool convertUTF8ToUTF16Impl(const char* source, const char* sourceEnd, UChar** targetStart, UChar* targetEnd, bool* sourceAllASCII)
{
RELEASE_ASSERT(sourceEnd - source <= std::numeric_limits<int>::max());
UBool error = false;
UChar* target = *targetStart;
RELEASE_ASSERT(targetEnd - target <= std::numeric_limits<int>::max());
UChar32 orAllData = 0;
int targetOffset = 0;
for (int sourceOffset = 0; sourceOffset < sourceEnd - source; ) {
UChar32 character;
if constexpr (replaceInvalidSequences) {
U8_NEXT_OR_FFFD(reinterpret_cast<const uint8_t*>(source), sourceOffset, sourceEnd - source, character);
} else {
U8_NEXT(reinterpret_cast<const uint8_t*>(source), sourceOffset, sourceEnd - source, character);
}
if (character < 0)
return false;
U16_APPEND(target, targetOffset, targetEnd - target, character, error);
if (error)
return false;
orAllData |= character;
}
RELEASE_ASSERT(target + targetOffset <= targetEnd);
*targetStart = target + targetOffset;
if (sourceAllASCII)
*sourceAllASCII = isASCII(orAllData);
return true;
}
bool convertUTF8ToUTF16(const char* source, const char* sourceEnd, UChar** targetStart, UChar* targetEnd, bool* sourceAllASCII)
{
return convertUTF8ToUTF16Impl<false>(source, sourceEnd, targetStart, targetEnd, sourceAllASCII);
}
bool convertUTF8ToUTF16ReplacingInvalidSequences(const char* source, const char* sourceEnd, UChar** targetStart, UChar* targetEnd, bool* sourceAllASCII)
{
return convertUTF8ToUTF16Impl<true>(source, sourceEnd, targetStart, targetEnd, sourceAllASCII);
}
unsigned calculateStringHashAndLengthFromUTF8MaskingTop8Bits(const char* data, const char* dataEnd, unsigned& dataLength, unsigned& utf16Length)
{
StringHasher stringHasher;
utf16Length = 0;
int inputOffset = 0;
int inputLength = dataEnd - data;
while (inputOffset < inputLength) {
UChar32 character;
U8_NEXT(reinterpret_cast<const uint8_t*>(data), inputOffset, inputLength, character);
if (character < 0)
return 0;
if (U_IS_BMP(character)) {
ASSERT(!U_IS_SURROGATE(character));
stringHasher.addCharacter(character);
utf16Length++;
} else {
ASSERT(U_IS_SUPPLEMENTARY(character));
stringHasher.addCharacters(U16_LEAD(character), U16_TRAIL(character));
utf16Length += 2;
}
}
dataLength = inputOffset;
return stringHasher.hashWithTop8BitsMasked();
}
bool equalUTF16WithUTF8(const UChar* a, const char* b, const char* bEnd)
{
while (b < bEnd) {
int offset = 0;
UChar32 character;
U8_NEXT(reinterpret_cast<const uint8_t*>(b), offset, bEnd - b, character);
if (character < 0)
return false;
b += offset;
if (U_IS_BMP(character)) {
ASSERT(!U_IS_SURROGATE(character));
if (*a++ != character)
return false;
} else {
ASSERT(U_IS_SUPPLEMENTARY(character));
if (*a++ != U16_LEAD(character))
return false;
if (*a++ != U16_TRAIL(character))
return false;
}
}
return true;
}
bool equalLatin1WithUTF8(const LChar* a, const char* b, const char* bEnd)
{
while (b < bEnd) {
if (isASCII(*a) || isASCII(*b)) {
if (*a++ != *b++)
return false;
continue;
}
if (b + 1 == bEnd)
return false;
if ((b[0] & 0xE0) != 0xC0 || (b[1] & 0xC0) != 0x80)
return false;
LChar character = ((b[0] & 0x1F) << 6) | (b[1] & 0x3F);
b += 2;
if (*a++ != character)
return false;
}
return true;
}
} // namespace Unicode
} // namespace WTF