NetworkCacheEncoder.h [plain text]
#ifndef NetworkCacheEncoder_h
#define NetworkCacheEncoder_h
#if ENABLE(NETWORK_CACHE)
#include "NetworkCacheCoder.h"
#include <wtf/SHA1.h>
#include <wtf/Vector.h>
namespace WebKit {
namespace NetworkCache {
class Encoder;
class DataReference;
class Encoder {
WTF_MAKE_FAST_ALLOCATED;
public:
Encoder();
virtual ~Encoder();
void encodeChecksum();
void encodeFixedLengthData(const uint8_t*, size_t);
template<typename T> void encodeEnum(T t)
{
COMPILE_ASSERT(sizeof(T) <= sizeof(uint64_t), enum_type_must_not_be_larger_than_64_bits);
encode(static_cast<uint64_t>(t));
}
template<typename T> void encode(const T& t)
{
Coder<T>::encode(*this, t);
}
template<typename T> Encoder& operator<<(const T& t)
{
encode(t);
return *this;
}
const uint8_t* buffer() const { return m_buffer.data(); }
size_t bufferSize() const { return m_buffer.size(); }
static void updateChecksumForData(SHA1&, const uint8_t*, size_t);
template <typename Type> static void updateChecksumForNumber(SHA1&, Type);
static const bool isIPCEncoder = false;
private:
void encode(bool);
void encode(uint8_t);
void encode(uint16_t);
void encode(uint32_t);
void encode(uint64_t);
void encode(int32_t);
void encode(int64_t);
void encode(float);
void encode(double);
template<typename Type> void encodeNumber(Type);
uint8_t* grow(size_t);
template <typename Type> struct Salt;
Vector<uint8_t, 4096> m_buffer;
SHA1 m_sha1;
};
template <> struct Encoder::Salt<bool> { static const unsigned value = 3; };
template <> struct Encoder::Salt<uint8_t> { static const unsigned value = 5; };
template <> struct Encoder::Salt<uint16_t> { static const unsigned value = 7; };
template <> struct Encoder::Salt<uint32_t> { static const unsigned value = 11; };
template <> struct Encoder::Salt<uint64_t> { static const unsigned value = 13; };
template <> struct Encoder::Salt<int32_t> { static const unsigned value = 17; };
template <> struct Encoder::Salt<int64_t> { static const unsigned value = 19; };
template <> struct Encoder::Salt<float> { static const unsigned value = 23; };
template <> struct Encoder::Salt<double> { static const unsigned value = 29; };
template <> struct Encoder::Salt<uint8_t*> { static const unsigned value = 101; };
template <typename Type>
void Encoder::updateChecksumForNumber(SHA1& sha1, Type value)
{
auto typeSalt = Salt<Type>::value;
sha1.addBytes(reinterpret_cast<uint8_t*>(&typeSalt), sizeof(typeSalt));
sha1.addBytes(reinterpret_cast<uint8_t*>(&value), sizeof(value));
}
}
}
#endif
#endif