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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 <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"
#include "net/spdy/hpack_huffman_table.h"
// All section references below are to
namespace net {
// An HpackInputStream handles all the low-level details of decoding
// header fields.
class NET_EXPORT_PRIVATE HpackInputStream {
// |max_string_literal_size| is the largest that any one string
// literal (header name or header value) can be.
HpackInputStream(uint32 max_string_literal_size, base::StringPiece buffer);
// Returns whether or not there is more data to process.
bool HasMoreData() const;
// If the next bits of input match |prefix|, consumes them and returns true.
// Otherwise, consumes nothing and returns false.
bool MatchPrefixAndConsume(HpackPrefix prefix);
// The Decode* functions return true and fill in their arguments if
// decoding was successful, or false if an error was encountered.
bool DecodeNextUint32(uint32* I);
bool DecodeNextIdentityString(base::StringPiece* str);
bool DecodeNextHuffmanString(const HpackHuffmanTable& table,
std::string* str);
// Stores input bits into the most-significant, unfilled bits of |out|.
// |peeked_count| is the number of filled bits in |out| which have been
// previously peeked. PeekBits() will fill some number of remaining bits,
// returning the new total number via |peeked_count|. Returns true if one
// or more additional bits could be peeked, and false otherwise.
bool PeekBits(size_t* peeked_count, uint32* out);
// Consumes |count| bits of input. Generally paired with PeekBits().
void ConsumeBits(size_t count);
// If not currently on a byte boundary, consumes and discards
// remaining bits in the current byte.
void ConsumeByteRemainder();
// Accessors for testing.
void SetBitOffsetForTest(size_t bit_offset) {
bit_offset_ = bit_offset;
const uint32 max_string_literal_size_;
base::StringPiece buffer_;
size_t bit_offset_;
bool PeekNextOctet(uint8* next_octet);
bool DecodeNextOctet(uint8* next_octet);
} // namespace net