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// Copyright 2014 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 <map>
#include <string>
#include "base/basictypes.h"
#include "base/macros.h"
#include "base/strings/string_piece.h"
#include "net/base/net_export.h"
#include "net/spdy/hpack_constants.h"
// All section references below are to
namespace net {
// An HpackOutputStream handles all the low-level details of encoding
// header fields.
class NET_EXPORT_PRIVATE HpackOutputStream {
explicit HpackOutputStream();
// Appends the lower |bit_size| bits of |bits| to the internal buffer.
// |bit_size| must be > 0 and <= 8. |bits| must not have any bits
// set other than the lower |bit_size| bits.
void AppendBits(uint8 bits, size_t bit_size);
// Simply forwards to AppendBits(prefix.bits, prefix.bit-size).
void AppendPrefix(HpackPrefix prefix);
// Directly appends |buffer|.
void AppendBytes(base::StringPiece buffer);
// Appends the given integer using the representation described in
// 4.1.1. If the internal buffer ends on a byte boundary, the prefix
// length N is taken to be 8; otherwise, it is taken to be the
// number of bits to the next byte boundary.
// It is guaranteed that the internal buffer will end on a byte
// boundary after this function is called.
void AppendUint32(uint32 I);
// Swaps the interal buffer with |output|.
void TakeString(std::string* output);
// The internal bit buffer.
std::string buffer_;
// If 0, the buffer ends on a byte boundary. If non-zero, the buffer
// ends on the most significant nth bit. Guaranteed to be < 8.
size_t bit_offset_;
} // namespace net