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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/quic/quic_data_writer.h"
#include <algorithm>
#include <limits>
#include "base/basictypes.h"
#include "base/logging.h"
#include "net/quic/quic_protocol.h"
using std::numeric_limits;
namespace net {
QuicDataWriter::QuicDataWriter(size_t size)
: buffer_(new char[size]),
capacity_(size),
length_(0) {
}
QuicDataWriter::~QuicDataWriter() {
delete[] buffer_;
}
char* QuicDataWriter::BeginWrite(size_t length) {
if (capacity_ - length_ < length) {
return NULL;
}
#ifdef ARCH_CPU_64_BITS
DCHECK_LE(length, numeric_limits<uint32>::max());
#endif
return buffer_ + length_;
}
bool QuicDataWriter::AdvancePointer(uint32 len) {
if (!BeginWrite(len)) {
return false;
}
length_ += len;
return true;
}
bool QuicDataWriter::WriteBytes(const void* data, uint32 data_len) {
char* dest = BeginWrite(data_len);
if (!dest) {
return false;
}
memcpy(dest, data, data_len);
length_ += data_len;
return true;
}
void QuicDataWriter::WriteUint64ToBuffer(uint64 value, char* buffer) {
memcpy(buffer, &value, sizeof(value));
}
void QuicDataWriter::WriteUint128ToBuffer(uint128 value, char* buffer) {
WriteUint64ToBuffer(value.lo, buffer);
WriteUint64ToBuffer(value.hi, buffer + sizeof(value.lo));
}
} // namespace net
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