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//
// Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// BinaryStream.h: Provides binary serialization of simple types.
#ifndef LIBANGLE_BINARYSTREAM_H_
#define LIBANGLE_BINARYSTREAM_H_
#include <cstddef>
#include <string>
#include <vector>
#include <stdint.h>
#include "common/angleutils.h"
#include "common/mathutil.h"
namespace gl
{
class BinaryInputStream : angle::NonCopyable
{
public:
BinaryInputStream(const void *data, size_t length)
{
mError = false;
mOffset = 0;
mData = static_cast<const uint8_t*>(data);
mLength = length;
}
// readInt will generate an error for bool types
template <class IntT>
IntT readInt()
{
int value = 0;
read(&value);
return static_cast<IntT>(value);
}
template <class IntT>
void readInt(IntT *outValue)
{
*outValue = readInt<IntT>();
}
bool readBool()
{
int value = 0;
read(&value);
return (value > 0);
}
void readBool(bool *outValue)
{
*outValue = readBool();
}
void readBytes(unsigned char outArray[], size_t count)
{
read<unsigned char>(outArray, count);
}
std::string readString()
{
std::string outString;
readString(&outString);
return outString;
}
void readString(std::string *v)
{
size_t length;
readInt(&length);
if (mError)
{
return;
}
angle::CheckedNumeric<size_t> checkedOffset(mOffset);
checkedOffset += length;
if (!checkedOffset.IsValid() || mOffset + length > mLength)
{
mError = true;
return;
}
v->assign(reinterpret_cast<const char *>(mData) + mOffset, length);
mOffset = checkedOffset.ValueOrDie();
}
void skip(size_t length)
{
angle::CheckedNumeric<size_t> checkedOffset(mOffset);
checkedOffset += length;
if (!checkedOffset.IsValid() || mOffset + length > mLength)
{
mError = true;
return;
}
mOffset = checkedOffset.ValueOrDie();
}
size_t offset() const
{
return mOffset;
}
bool error() const
{
return mError;
}
bool endOfStream() const
{
return mOffset == mLength;
}
const uint8_t *data()
{
return mData;
}
private:
bool mError;
size_t mOffset;
const uint8_t *mData;
size_t mLength;
template <typename T>
void read(T *v, size_t num)
{
static_assert(std::is_fundamental<T>::value, "T must be a fundamental type.");
angle::CheckedNumeric<size_t> checkedLength(num);
checkedLength *= sizeof(T);
if (!checkedLength.IsValid())
{
mError = true;
return;
}
angle::CheckedNumeric<size_t> checkedOffset(mOffset);
checkedOffset += checkedLength;
if (!checkedOffset.IsValid() || checkedOffset.ValueOrDie() > mLength)
{
mError = true;
return;
}
memcpy(v, mData + mOffset, checkedLength.ValueOrDie());
mOffset = checkedOffset.ValueOrDie();
}
template <typename T>
void read(T *v)
{
read(v, 1);
}
};
class BinaryOutputStream : angle::NonCopyable
{
public:
BinaryOutputStream()
{
}
// writeInt also handles bool types
template <class IntT>
void writeInt(IntT param)
{
ASSERT(angle::IsValueInRangeForNumericType<int>(param));
int intValue = static_cast<int>(param);
write(&intValue, 1);
}
// Specialized writeInt for values that can also be exactly -1.
template <class UintT>
void writeIntOrNegOne(UintT param)
{
if (param == static_cast<UintT>(-1))
{
writeInt(-1);
}
else
{
writeInt(param);
}
}
void writeString(const std::string &v)
{
writeInt(v.length());
write(v.c_str(), v.length());
}
void writeBytes(const unsigned char *bytes, size_t count)
{
write(bytes, count);
}
size_t length() const
{
return mData.size();
}
const void* data() const
{
return mData.size() ? &mData[0] : NULL;
}
private:
std::vector<char> mData;
template <typename T>
void write(const T *v, size_t num)
{
static_assert(std::is_fundamental<T>::value, "T must be a fundamental type.");
const char *asBytes = reinterpret_cast<const char*>(v);
mData.insert(mData.end(), asBytes, asBytes + num * sizeof(T));
}
};
}
#endif // LIBANGLE_BINARYSTREAM_H_
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