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/*
* Copyright (C) 2011-2024 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/StdLibExtras.h>
#include <wtf/URL.h>
#include <wtf/text/CString.h>
#include <wtf/text/WTFString.h>
namespace WTF::Persistence {
void Coder<AtomString>::encodeForPersistence(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>::decodeForPersistence(Decoder& decoder)
{
std::optional<String> string;
decoder >> string;
if (!string)
return std::nullopt;
return { AtomString { WTFMove(*string) } };
}
void Coder<CString>::encodeForPersistence(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(byteCast<uint8_t>(string.span()));
}
std::optional<CString> Coder<CString>::decodeForPersistence(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;
std::span<char> buffer;
CString string = CString::newUninitialized(*length, buffer);
if (!decoder.decodeFixedLengthData(byteCast<uint8_t>(buffer)))
return std::nullopt;
return string;
}
void Coder<String>::encodeForPersistence(Encoder& encoder, const String& string)
{
// Special case the null string.
if (string.isNull()) {
encoder << std::numeric_limits<uint32_t>::max();
return;
}
bool is8Bit = string.is8Bit();
encoder << string.length() << is8Bit;
if (is8Bit)
encoder.encodeFixedLengthData(string.span8());
else
encoder.encodeFixedLengthData(asBytes(string.span16()));
}
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;
std::span<CharacterType> buffer;
String string = String::createUninitialized(length, buffer);
if (!decoder.decodeFixedLengthData(asMutableByteSpan(buffer)))
return std::nullopt;
return string;
}
std::optional<String> Coder<String>::decodeForPersistence(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<URL>::encodeForPersistence(Encoder& encoder, const URL& url)
{
encoder << url.string();
}
std::optional<URL> Coder<URL>::decodeForPersistence(Decoder& decoder)
{
std::optional<String> string;
decoder >> string;
if (!string)
return std::nullopt;
return URL(WTFMove(*string));
}
void Coder<SHA1::Digest>::encodeForPersistence(Encoder& encoder, const SHA1::Digest& digest)
{
encoder.encodeFixedLengthData({ digest });
}
std::optional<SHA1::Digest> Coder<SHA1::Digest>::decodeForPersistence(Decoder& decoder)
{
SHA1::Digest tmp;
if (!decoder.decodeFixedLengthData({ tmp }))
return std::nullopt;
return tmp;
}
void Coder<WallTime>::encodeForPersistence(Encoder& encoder, const WallTime& time)
{
encoder << time.secondsSinceEpoch().value();
}
std::optional<WallTime> Coder<WallTime>::decodeForPersistence(Decoder& decoder)
{
std::optional<double> value;
decoder >> value;
if (!value)
return std::nullopt;
return WallTime::fromRawSeconds(*value);
}
void Coder<Seconds>::encodeForPersistence(Encoder& encoder, const Seconds& seconds)
{
encoder << seconds.value();
}
std::optional<Seconds> Coder<Seconds>::decodeForPersistence(Decoder& decoder)
{
std::optional<double> value;
decoder >> value;
if (!value)
return std::nullopt;
return Seconds(*value);
}
}
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