NetworkCacheDecoder.cpp [plain text]
#include "config.h"
#include "NetworkCacheDecoder.h"
#if ENABLE(NETWORK_CACHE)
#include "NetworkCacheEncoder.h"
namespace WebKit {
namespace NetworkCache {
Decoder::Decoder(const uint8_t* buffer, size_t bufferSize)
: m_buffer(buffer)
, m_bufferPosition(buffer)
, m_bufferEnd(buffer + bufferSize)
{
}
Decoder::~Decoder()
{
}
bool Decoder::bufferIsLargeEnoughToContain(size_t size) const
{
return size <= static_cast<size_t>(m_bufferEnd - m_bufferPosition);
}
bool Decoder::decodeFixedLengthData(uint8_t* data, size_t size)
{
if (!bufferIsLargeEnoughToContain(size))
return false;
memcpy(data, m_bufferPosition, size);
m_bufferPosition += size;
Encoder::updateChecksumForData(m_sha1, data, size);
return true;
}
template<typename Type>
bool Decoder::decodeNumber(Type& value)
{
if (!bufferIsLargeEnoughToContain(sizeof(value)))
return false;
memcpy(&value, m_bufferPosition, sizeof(value));
m_bufferPosition += sizeof(Type);
Encoder::updateChecksumForNumber(m_sha1, value);
return true;
}
bool Decoder::decode(bool& result)
{
return decodeNumber(result);
}
bool Decoder::decode(uint8_t& result)
{
return decodeNumber(result);
}
bool Decoder::decode(uint16_t& result)
{
return decodeNumber(result);
}
bool Decoder::decode(uint32_t& result)
{
return decodeNumber(result);
}
bool Decoder::decode(uint64_t& result)
{
return decodeNumber(result);
}
bool Decoder::decode(int32_t& result)
{
return decodeNumber(result);
}
bool Decoder::decode(int64_t& result)
{
return decodeNumber(result);
}
bool Decoder::decode(float& result)
{
return decodeNumber(result);
}
bool Decoder::decode(double& result)
{
return decodeNumber(result);
}
bool Decoder::verifyChecksum()
{
SHA1::Digest computedHash;
m_sha1.computeHash(computedHash);
SHA1::Digest savedHash;
if (!decodeFixedLengthData(savedHash.data(), sizeof(savedHash)))
return false;
return computedHash == savedHash;
}
}
}
#endif