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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 LIBGLESV2_BINARYSTREAM_H_
#define LIBGLESV2_BINARYSTREAM_H_
#include <string>
#include <vector>
#include "common/angleutils.h"
namespace gl
{
class BinaryInputStream
{
public:
BinaryInputStream(const void *data, size_t length)
{
mError = false;
mOffset = 0;
mData = static_cast<const char*>(data);
mLength = length;
}
template <typename T>
void read(T *v, size_t num)
{
union
{
T dummy; // Compilation error for non-trivial types
} dummy;
(void) dummy;
if (mError)
{
return;
}
size_t length = num * sizeof(T);
if (mOffset + length > mLength)
{
mError = true;
return;
}
memcpy(v, mData + mOffset, length);
mOffset += length;
}
template <typename T>
void read(T * v)
{
read(v, 1);
}
void read(std::string *v)
{
size_t length;
read(&length);
if (mError)
{
return;
}
if (mOffset + length > mLength)
{
mError = true;
return;
}
v->assign(mData + mOffset, length);
mOffset += length;
}
void skip(size_t length)
{
if (mOffset + length > mLength)
{
mError = true;
return;
}
mOffset += length;
}
size_t offset() const
{
return mOffset;
}
bool error() const
{
return mError;
}
bool endOfStream() const
{
return mOffset == mLength;
}
private:
DISALLOW_COPY_AND_ASSIGN(BinaryInputStream);
bool mError;
size_t mOffset;
const char *mData;
size_t mLength;
};
class BinaryOutputStream
{
public:
BinaryOutputStream()
{
}
template <typename T>
void write(const T *v, size_t num)
{
union
{
T dummy; // Compilation error for non-trivial types
} dummy;
(void) dummy;
const char *asBytes = reinterpret_cast<const char*>(v);
mData.insert(mData.end(), asBytes, asBytes + num * sizeof(T));
}
template <typename T>
void write(const T &v)
{
write(&v, 1);
}
void write(const std::string &v)
{
size_t length = v.length();
write(length);
write(v.c_str(), length);
}
size_t length() const
{
return mData.size();
}
const void* data() const
{
return mData.size() ? &mData[0] : NULL;
}
private:
DISALLOW_COPY_AND_ASSIGN(BinaryOutputStream);
std::vector<char> mData;
};
}
#endif // LIBGLESV2_BINARYSTREAM_H_
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