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/*
* Copyright (C) 2011, 2014-2015 Apple Inc. All rights reserved.
*
* 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. AND ITS CONTRIBUTORS ``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 ITS 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/persistence/PersistentCoders.h>
#include <wtf/text/CString.h>
#include <wtf/text/WTFString.h>
namespace WTF {
namespace Persistence {
void Coder<AtomString>::encode(Encoder& encoder, const AtomString& atomString)
{
encoder << atomString.string();
}
// FIXME: Constructing a String and then looking it up in the AtomStringTable is inefficient.
// Ideally, we wouldn't need to allocate a String when it is already in the AtomStringTable.
std::optional<AtomString> Coder<AtomString>::decode(Decoder& decoder)
{
std::optional<String> string;
decoder >> string;
if (!string)
return std::nullopt;
return { AtomString { WTFMove(*string) } };
}
void Coder<CString>::encode(Encoder& encoder, const CString& string)
{
// Special case the null string.
if (string.isNull()) {
encoder << std::numeric_limits<uint32_t>::max();
return;
}
uint32_t length = string.length();
encoder << length;
encoder.encodeFixedLengthData({ string.dataAsUInt8Ptr(), length });
}
std::optional<CString> Coder<CString>::decode(Decoder& decoder)
{
std::optional<uint32_t> length;
decoder >> length;
if (!length)
return std::nullopt;
if (length == std::numeric_limits<uint32_t>::max()) {
// This is the null string.
return CString();
}
// Before allocating the string, make sure that the decoder buffer is big enough.
if (!decoder.bufferIsLargeEnoughToContain<char>(*length))
return std::nullopt;
char* buffer;
CString string = CString::newUninitialized(*length, buffer);
if (!decoder.decodeFixedLengthData({ reinterpret_cast<uint8_t*>(buffer), *length }))
return std::nullopt;
return string;
}
void Coder<String>::encode(Encoder& encoder, const String& string)
{
// Special case the null string.
if (string.isNull()) {
encoder << std::numeric_limits<uint32_t>::max();
return;
}
uint32_t length = string.length();
bool is8Bit = string.is8Bit();
encoder << length << is8Bit;
if (is8Bit)
encoder.encodeFixedLengthData({ string.characters8(), length });
else
encoder.encodeFixedLengthData({ reinterpret_cast<const uint8_t*>(string.characters16()), length * sizeof(UChar) });
}
template <typename CharacterType>
static inline std::optional<String> decodeStringText(Decoder& decoder, uint32_t length)
{
// Before allocating the string, make sure that the decoder buffer is big enough.
if (!decoder.bufferIsLargeEnoughToContain<CharacterType>(length))
return std::nullopt;
CharacterType* buffer;
String string = String::createUninitialized(length, buffer);
if (!decoder.decodeFixedLengthData({ reinterpret_cast<uint8_t*>(buffer), length * sizeof(CharacterType) }))
return std::nullopt;
return string;
}
std::optional<String> Coder<String>::decode(Decoder& decoder)
{
std::optional<uint32_t> length;
decoder >> length;
if (!length)
return std::nullopt;
if (*length == std::numeric_limits<uint32_t>::max()) {
// This is the null string.
return String();
}
std::optional<bool> is8Bit;
decoder >> is8Bit;
if (!is8Bit)
return std::nullopt;
if (*is8Bit)
return decodeStringText<LChar>(decoder, *length);
return decodeStringText<UChar>(decoder, *length);
}
void Coder<SHA1::Digest>::encode(Encoder& encoder, const SHA1::Digest& digest)
{
encoder.encodeFixedLengthData({ digest.data(), sizeof(digest) });
}
std::optional<SHA1::Digest> Coder<SHA1::Digest>::decode(Decoder& decoder)
{
SHA1::Digest tmp;
if (!decoder.decodeFixedLengthData({ tmp.data(), sizeof(tmp) }))
return std::nullopt;
return tmp;
}
}
}