// Copyright (c) 2009 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/base/io_buffer.h"

#include "base/logging.h"

namespace net {

IOBuffer::IOBuffer(int buffer_size) {
  DCHECK(buffer_size > 0);
  data_ = new char[buffer_size];
}

void DrainableIOBuffer::SetOffset(int bytes) {
  DCHECK(bytes >= 0 && bytes <= size_);
  used_ = bytes;
  data_ = base_->data() + used_;
}

void GrowableIOBuffer::SetCapacity(int capacity) {
  DCHECK(capacity >= 0);
  // realloc will crash if it fails.
  real_data_.reset(static_cast<char*>(realloc(real_data_.release(), capacity)));
  capacity_ = capacity;
  if (offset_ > capacity)
    set_offset(capacity);
  else
    set_offset(offset_);  // The pointer may have changed.
}

void GrowableIOBuffer::set_offset(int offset) {
  DCHECK(offset >= 0 && offset <= capacity_);
  offset_ = offset;
  data_ = real_data_.get() + offset;
}

}  // namespace net