| /* |
| * 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(); |
| } |
| |
| std::optional<AtomString> Coder<AtomString>::decode(Decoder& decoder) |
| { |
| std::optional<String> string; |
| decoder >> string; |
| if (!string) |
| return std::nullopt; |
| |
| return {{ 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; |
| } |
| |
| } |
| } |