158 lines
4.8 KiB
C++
158 lines
4.8 KiB
C++
/*
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* Copyright (C) 2011, 2014-2015 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <wtf/persistence/PersistentCoders.h>
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#include <wtf/text/CString.h>
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#include <wtf/text/WTFString.h>
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namespace WTF {
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namespace Persistence {
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void Coder<AtomString>::encode(Encoder& encoder, const AtomString& atomString)
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{
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encoder << atomString.string();
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}
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std::optional<AtomString> Coder<AtomString>::decode(Decoder& decoder)
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{
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std::optional<String> string;
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decoder >> string;
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if (!string)
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return std::nullopt;
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return {{ WTFMove(*string) }};
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}
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void Coder<CString>::encode(Encoder& encoder, const CString& string)
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{
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// Special case the null string.
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if (string.isNull()) {
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encoder << std::numeric_limits<uint32_t>::max();
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return;
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}
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uint32_t length = string.length();
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encoder << length;
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encoder.encodeFixedLengthData({ string.dataAsUInt8Ptr(), length });
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}
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std::optional<CString> Coder<CString>::decode(Decoder& decoder)
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{
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std::optional<uint32_t> length;
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decoder >> length;
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if (!length)
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return std::nullopt;
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if (length == std::numeric_limits<uint32_t>::max()) {
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// This is the null string.
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return CString();
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}
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// Before allocating the string, make sure that the decoder buffer is big enough.
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if (!decoder.bufferIsLargeEnoughToContain<char>(*length))
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return std::nullopt;
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char* buffer;
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CString string = CString::newUninitialized(*length, buffer);
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if (!decoder.decodeFixedLengthData({ reinterpret_cast<uint8_t*>(buffer), *length }))
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return std::nullopt;
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return string;
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}
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void Coder<String>::encode(Encoder& encoder, const String& string)
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{
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// Special case the null string.
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if (string.isNull()) {
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encoder << std::numeric_limits<uint32_t>::max();
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return;
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}
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uint32_t length = string.length();
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bool is8Bit = string.is8Bit();
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encoder << length << is8Bit;
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if (is8Bit)
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encoder.encodeFixedLengthData({ string.characters8(), length });
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else
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encoder.encodeFixedLengthData({ reinterpret_cast<const uint8_t*>(string.characters16()), length * sizeof(UChar) });
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}
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template <typename CharacterType>
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static inline std::optional<String> decodeStringText(Decoder& decoder, uint32_t length)
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{
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// Before allocating the string, make sure that the decoder buffer is big enough.
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if (!decoder.bufferIsLargeEnoughToContain<CharacterType>(length))
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return std::nullopt;
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CharacterType* buffer;
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String string = String::createUninitialized(length, buffer);
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if (!decoder.decodeFixedLengthData({ reinterpret_cast<uint8_t*>(buffer), length * sizeof(CharacterType) }))
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return std::nullopt;
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return string;
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}
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std::optional<String> Coder<String>::decode(Decoder& decoder)
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{
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std::optional<uint32_t> length;
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decoder >> length;
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if (!length)
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return std::nullopt;
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if (*length == std::numeric_limits<uint32_t>::max()) {
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// This is the null string.
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return String();
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}
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std::optional<bool> is8Bit;
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decoder >> is8Bit;
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if (!is8Bit)
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return std::nullopt;
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if (*is8Bit)
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return decodeStringText<LChar>(decoder, *length);
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return decodeStringText<UChar>(decoder, *length);
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}
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void Coder<SHA1::Digest>::encode(Encoder& encoder, const SHA1::Digest& digest)
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{
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encoder.encodeFixedLengthData({ digest.data(), sizeof(digest) });
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}
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std::optional<SHA1::Digest> Coder<SHA1::Digest>::decode(Decoder& decoder)
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{
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SHA1::Digest tmp;
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if (!decoder.decodeFixedLengthData({ tmp.data(), sizeof(tmp) }))
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return std::nullopt;
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return tmp;
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}
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}
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}
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