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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.
*/
#include "talk/base/basictypes.h"
#include "talk/base/bytebuffer.h"
#include "talk/base/byteorder.h"
#include <algorithm>
#include <cassert>
#include <cstring>
#if defined(_MSC_VER) && _MSC_VER < 1300
namespace std {
using ::memcpy;
}
#endif
namespace cricket {
const int DEFAULT_SIZE = 4096;
ByteBuffer::ByteBuffer() {
start_ = 0;
end_ = 0;
size_ = DEFAULT_SIZE;
bytes_ = new char[size_];
}
ByteBuffer::ByteBuffer(const char* bytes, size_t len) {
start_ = 0;
end_ = len;
size_ = len;
bytes_ = new char[size_];
memcpy(bytes_, bytes, end_);
}
ByteBuffer::ByteBuffer(const char* bytes) {
start_ = 0;
end_ = strlen(bytes);
size_ = end_;
bytes_ = new char[size_];
memcpy(bytes_, bytes, end_);
}
ByteBuffer::~ByteBuffer() {
delete bytes_;
}
bool ByteBuffer::ReadUInt8(uint8& val) {
return ReadBytes(reinterpret_cast<char*>(&val), 1);
}
bool ByteBuffer::ReadUInt16(uint16& val) {
uint16 v;
if (!ReadBytes(reinterpret_cast<char*>(&v), 2)) {
return false;
} else {
val = NetworkToHost16(v);
return true;
}
}
bool ByteBuffer::ReadUInt32(uint32& val) {
uint32 v;
if (!ReadBytes(reinterpret_cast<char*>(&v), 4)) {
return false;
} else {
val = NetworkToHost32(v);
return true;
}
}
bool ByteBuffer::ReadString(std::string& val, size_t len) {
if (len > Length()) {
return false;
} else {
val.append(bytes_ + start_, len);
start_ += len;
return true;
}
}
bool ByteBuffer::ReadBytes(char* val, size_t len) {
if (len > Length()) {
return false;
} else {
memcpy(val, bytes_ + start_, len);
start_ += len;
return true;
}
}
void ByteBuffer::WriteUInt8(uint8 val) {
WriteBytes(reinterpret_cast<const char*>(&val), 1);
}
void ByteBuffer::WriteUInt16(uint16 val) {
uint16 v = HostToNetwork16(val);
WriteBytes(reinterpret_cast<const char*>(&v), 2);
}
void ByteBuffer::WriteUInt32(uint32 val) {
uint32 v = HostToNetwork32(val);
WriteBytes(reinterpret_cast<const char*>(&v), 4);
}
void ByteBuffer::WriteString(const std::string& val) {
WriteBytes(val.c_str(), val.size());
}
void ByteBuffer::WriteBytes(const char* val, size_t len) {
if (Length() + len > Capacity())
Resize(Length() + len);
memcpy(bytes_ + end_, val, len);
end_ += len;
}
void ByteBuffer::Resize(size_t size) {
if (size > size_)
size = _max(size, 3 * size_ / 2);
size_t len = _min(end_ - start_, size);
char* new_bytes = new char[size];
memcpy(new_bytes, bytes_ + start_, len);
delete [] bytes_;
start_ = 0;
end_ = len;
size_ = size;
bytes_ = new_bytes;
}
void ByteBuffer::Shift(size_t size) {
if (size > Length())
return;
end_ = Length() - size;
memmove(bytes_, bytes_ + start_ + size, end_);
start_ = 0;
}
} // namespace cricket
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