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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef MOZILLA_GFX_RECORDINGTYPES_H_
#define MOZILLA_GFX_RECORDINGTYPES_H_
#include <ostream>
#include <vector>
#include "Logging.h"
namespace mozilla {
namespace gfx {
template <class S, class T>
struct ElementStreamFormat {
static void Write(S& aStream, const T& aElement) {
aStream.write(reinterpret_cast<const char*>(&aElement), sizeof(T));
}
static void Read(S& aStream, T& aElement) {
aStream.read(reinterpret_cast<char*>(&aElement), sizeof(T));
}
};
template <class S>
struct ElementStreamFormat<S, bool> {
static void Write(S& aStream, const bool& aElement) {
char boolChar = aElement ? '\x01' : '\x00';
aStream.write(&boolChar, sizeof(boolChar));
}
static void Read(S& aStream, bool& aElement) {
char boolChar;
aStream.read(&boolChar, sizeof(boolChar));
switch (boolChar) {
case '\x00':
aElement = false;
break;
case '\x01':
aElement = true;
break;
default:
aStream.SetIsBad();
break;
}
}
};
template <class S, class T>
void WriteElement(S& aStream, const T& aElement) {
ElementStreamFormat<S, T>::Write(aStream, aElement);
}
template <class S, class T>
void WriteVector(S& aStream, const std::vector<T>& aVector) {
size_t size = aVector.size();
WriteElement(aStream, size);
if (size) {
aStream.write(reinterpret_cast<const char*>(aVector.data()),
sizeof(T) * size);
}
}
// ReadElement is disabled for enum types. Use ReadElementConstrained instead.
template <class S, class T,
typename = typename std::enable_if<!std::is_enum<T>::value>::type>
void ReadElement(S& aStream, T& aElement) {
ElementStreamFormat<S, T>::Read(aStream, aElement);
}
template <class S, class T>
void ReadElementConstrained(S& aStream, T& aElement, const T& aMinValue,
const T& aMaxValue) {
ElementStreamFormat<S, T>::Read(aStream, aElement);
if (aElement < aMinValue || aElement > aMaxValue) {
aStream.SetIsBad();
}
}
template <class S, class T>
void ReadVector(S& aStream, std::vector<T>& aVector) {
size_t size;
ReadElement(aStream, size);
if (size && aStream.good()) {
aVector.resize(size);
aStream.read(reinterpret_cast<char*>(aVector.data()), sizeof(T) * size);
} else {
aVector.clear();
}
}
} // namespace gfx
} // namespace mozilla
#endif /* MOZILLA_GFX_RECORDINGTYPES_H_ */
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