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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TALK_BASE_BYTEBUFFER_H_
#define TALK_BASE_BYTEBUFFER_H_
#include <string>
#include "talk/base/basictypes.h"
#include "talk/base/constructormagic.h"
namespace talk_base {
class ByteBuffer {
public:
enum ByteOrder {
ORDER_NETWORK = 0, // Default, use network byte order (big endian).
ORDER_HOST, // Use the native order of the host.
};
// |byte_order| defines order of bytes in the buffer.
ByteBuffer();
explicit ByteBuffer(ByteOrder byte_order);
ByteBuffer(const char* bytes, size_t len);
ByteBuffer(const char* bytes, size_t len, ByteOrder byte_order);
// Initializes buffer from a zero-terminated string.
explicit ByteBuffer(const char* bytes);
~ByteBuffer();
const char* Data() const { return bytes_ + start_; }
size_t Length() const { return end_ - start_; }
size_t Capacity() const { return size_ - start_; }
ByteOrder Order() const { return byte_order_; }
// Read a next value from the buffer. Return false if there isn't
// enough data left for the specified type.
bool ReadUInt8(uint8* val);
bool ReadUInt16(uint16* val);
bool ReadUInt24(uint32* val);
bool ReadUInt32(uint32* val);
bool ReadUInt64(uint64* 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);
// Write value to the buffer. Resizes the buffer when it is
// neccessary.
void WriteUInt8(uint8 val);
void WriteUInt16(uint16 val);
void WriteUInt24(uint32 val);
void WriteUInt32(uint32 val);
void WriteUInt64(uint64 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
// ByteBuffer.
char* ReserveWriteBuffer(size_t len);
// Resize the buffer to the specified |size|. This invalidates any remembered
// seek positions.
void Resize(size_t size);
// 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);
// Clears the contents of the buffer. After this, Length() will be 0.
void Clear();
// Used with GetReadPosition/SetReadPosition.
class ReadPosition {
friend class ByteBuffer;
ReadPosition(size_t start, int version)
: start_(start), version_(version) { }
size_t start_;
int version_;
};
// Remembers the current read position for a future SetReadPosition. Any
// calls to Shift or Resize in the interim will invalidate the position.
ReadPosition GetReadPosition() const;
// If the given position is still valid, restores that read position.
bool SetReadPosition(const ReadPosition &position);
private:
void Construct(const char* bytes, size_t size, ByteOrder byte_order);
char* bytes_;
size_t size_;
size_t start_;
size_t end_;
int version_;
ByteOrder byte_order_;
// There are sensible ways to define these, but they aren't needed in our code
// base.
DISALLOW_COPY_AND_ASSIGN(ByteBuffer);
};
} // namespace talk_base
#endif // TALK_BASE_BYTEBUFFER_H_
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