Split net/spdy into core and chromium subdirectories.

net/spdy/hpack/hpack_input_stream.h

-// 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.
-
-#ifndef NET_SPDY_HPACK_HPACK_INPUT_STREAM_H_
-#define NET_SPDY_HPACK_HPACK_INPUT_STREAM_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <utility>
-
-#include "base/macros.h"
-#include "net/base/net_export.h"
-#include "net/spdy/hpack/hpack_constants.h"
-#include "net/spdy/hpack/hpack_huffman_table.h"
-#include "net/spdy/platform/api/spdy_string.h"
-#include "net/spdy/platform/api/spdy_string_piece.h"
-
-// All section references below are to
-// http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-08
-
-namespace net {
-
-namespace test {
-class HpackInputStreamPeer;
-}  // namespace test
-
-typedef std::pair<size_t, uint32_t> InitialPeekResult;
-
-// An HpackInputStream handles all the low-level details of decoding
-// header fields.
-class NET_EXPORT_PRIVATE HpackInputStream {
- public:
-  friend class test::HpackInputStreamPeer;
-
-  explicit HpackInputStream(SpdyStringPiece buffer);
-  ~HpackInputStream();
-
-  // 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_t* I);
-  bool DecodeNextIdentityString(SpdyStringPiece* str);
-  bool DecodeNextHuffmanString(SpdyString* 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 were added to |out|, and false otherwise.
-  bool PeekBits(size_t* peeked_count, uint32_t* out) const;
-
-  // Similar to PeekBits, but intended to be used when starting to decode a
-  // Huffman encoded string. Returns a pair containing the peeked_count and
-  // out values as described for PeekBits, with the bits from the first N bytes
-  // of buffer_, where N == min(4, buffer_.size()), starting with the high
-  // order bits.
-  // Should only be called when first peeking at bits from the input stream as
-  // it does not take peeked_count as an input, so doesn't know how many bits
-  // have already been returned by previous calls to InitializePeekBits and
-  // PeekBits.
-  InitialPeekResult InitializePeekBits();
-
-  // 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();
-
-  // Return the total bytes that have been parsed SUCCESSFULLY.
-  uint32_t ParsedBytes() const;
-
-  // When incrementally decode the header, need to remember the current
-  // position in the buffer after we successfully decode one opcode.
-  void MarkCurrentPosition();
-
-  // Returning true indicates this instance of HpackInputStream
-  // doesn't have enough data to parse the current opcode, and we
-  // are done with this instance. When more data arrive, a new
-  // HpackInputStream should be created to restart the parsing.
-  bool NeedMoreData() const;
-
- private:
-  SpdyStringPiece buffer_;
-  size_t bit_offset_;
-  // Total number of bytes parsed successfully. Only get updated when an
-  // opcode is parsed successfully.
-  uint32_t parsed_bytes_;
-  // Total number of bytes parsed currently. Get updated when an octet,
-  // a number or a string has been parsed successfully. Can point to the
-  // middle of an opcode.
-  uint32_t parsed_bytes_current_;
-  bool need_more_data_;
-
-  bool PeekNextOctet(uint8_t* next_octet);
-
-  bool DecodeNextOctet(uint8_t* next_octet);
-
-  DISALLOW_COPY_AND_ASSIGN(HpackInputStream);
-};
-
-}  // namespace net
-
-#endif  // NET_SPDY_HPACK_HPACK_INPUT_STREAM_H_