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/*
* Copyright 2004 The WebRTC 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 in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef WEBRTC_BASE_BYTEBUFFER_H_
#define WEBRTC_BASE_BYTEBUFFER_H_
#include <string>
#include "webrtc/base/basictypes.h"
#include "webrtc/base/buffer.h"
#include "webrtc/base/constructormagic.h"
namespace rtc {
class ByteBuffer {
public:
enum ByteOrder {
ORDER_NETWORK = 0, // Default, use network byte order (big endian).
ORDER_HOST, // Use the native order of the host.
};
explicit ByteBuffer(ByteOrder byte_order) : byte_order_(byte_order) {}
ByteOrder Order() const { return byte_order_; }
private:
ByteOrder byte_order_;
RTC_DISALLOW_COPY_AND_ASSIGN(ByteBuffer);
};
class ByteBufferWriter : public ByteBuffer {
public:
// |byte_order| defines order of bytes in the buffer.
ByteBufferWriter();
explicit ByteBufferWriter(ByteOrder byte_order);
ByteBufferWriter(const char* bytes, size_t len);
ByteBufferWriter(const char* bytes, size_t len, ByteOrder byte_order);
~ByteBufferWriter();
const char* Data() const { return bytes_; }
size_t Length() const { return end_; }
size_t Capacity() const { return size_; }
// Write value to the buffer. Resizes the buffer when it is
// neccessary.
void WriteUInt8(uint8_t val);
void WriteUInt16(uint16_t val);
void WriteUInt24(uint32_t val);
void WriteUInt32(uint32_t val);
void WriteUInt64(uint64_t val);
void WriteUVarint(uint64_t val);
void WriteString(const std::string& val);
void WriteBytes(const char* val, size_t len);
// Reserves the given number of bytes and returns a char* that can be written
// into. Useful for functions that require a char* buffer and not a
// ByteBufferWriter.
char* ReserveWriteBuffer(size_t len);
// Resize the buffer to the specified |size|.
void Resize(size_t size);
// Clears the contents of the buffer. After this, Length() will be 0.
void Clear();
private:
void Construct(const char* bytes, size_t size);
char* bytes_;
size_t size_;
size_t end_;
// There are sensible ways to define these, but they aren't needed in our code
// base.
RTC_DISALLOW_COPY_AND_ASSIGN(ByteBufferWriter);
};
// The ByteBufferReader references the passed data, i.e. the pointer must be
// valid during the lifetime of the reader.
class ByteBufferReader : public ByteBuffer {
public:
ByteBufferReader(const char* bytes, size_t len);
ByteBufferReader(const char* bytes, size_t len, ByteOrder byte_order);
// Initializes buffer from a zero-terminated string.
explicit ByteBufferReader(const char* bytes);
explicit ByteBufferReader(const Buffer& buf);
explicit ByteBufferReader(const ByteBufferWriter& buf);
// Returns start of unprocessed data.
const char* Data() const { return bytes_ + start_; }
// Returns number of unprocessed bytes.
size_t Length() const { return end_ - start_; }
// Read a next value from the buffer. Return false if there isn't
// enough data left for the specified type.
bool ReadUInt8(uint8_t* val);
bool ReadUInt16(uint16_t* val);
bool ReadUInt24(uint32_t* val);
bool ReadUInt32(uint32_t* val);
bool ReadUInt64(uint64_t* val);
bool ReadUVarint(uint64_t* val);
bool ReadBytes(char* val, size_t len);
// Appends next |len| bytes from the buffer to |val|. Returns false
// if there is less than |len| bytes left.
bool ReadString(std::string* val, size_t len);
// Moves current position |size| bytes forward. Returns false if
// there is less than |size| bytes left in the buffer. Consume doesn't
// permanently remove data, so remembered read positions are still valid
// after this call.
bool Consume(size_t size);
private:
void Construct(const char* bytes, size_t size);
const char* bytes_;
size_t size_;
size_t start_;
size_t end_;
RTC_DISALLOW_COPY_AND_ASSIGN(ByteBufferReader);
};
} // namespace rtc
#endif // WEBRTC_BASE_BYTEBUFFER_H_
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