Split net/spdy into core and chromium subdirectories.

net/spdy/hpack/hpack_decoder.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_DECODER_H_
-#define NET_SPDY_HPACK_HPACK_DECODER_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <map>
-#include <memory>
-#include <vector>
-
-#include "base/macros.h"
-#include "net/base/net_export.h"
-#include "net/spdy/hpack/hpack_decoder_interface.h"
-#include "net/spdy/hpack/hpack_header_table.h"
-#include "net/spdy/hpack/hpack_input_stream.h"
-#include "net/spdy/platform/api/spdy_string.h"
-#include "net/spdy/platform/api/spdy_string_piece.h"
-#include "net/spdy/spdy_headers_handler_interface.h"
-#include "net/spdy/spdy_protocol.h"
-
-// An HpackDecoder decodes header sets as outlined in
-// http://tools.ietf.org/html/rfc7541.
-
-namespace net {
-
-namespace test {
-class HpackDecoderPeer;
-}  // namespace test
-
-class NET_EXPORT_PRIVATE HpackDecoder : public HpackDecoderInterface {
- public:
-  friend class test::HpackDecoderPeer;
-
-  HpackDecoder();
-  ~HpackDecoder() override;
-
-  // Called upon sending a SETTINGS_HEADER_TABLE_SIZE value.
-  void ApplyHeaderTableSizeSetting(size_t size_setting) override;
-
-  // If a SpdyHeadersHandlerInterface is provided, HpackDecoder will emit
-  // headers to it rather than accumulating them in a SpdyHeaderBlock.
-  void HandleControlFrameHeadersStart(
-      SpdyHeadersHandlerInterface* handler) override;
-
-  // Called as headers data arrives. Returns false if an error occurred.
-  // TODO(jgraettinger): A future version of this method will incrementally
-  // parse and deliver headers via SpdyHeadersHandlerInterface. For now,
-  // header data is buffered until HandleControlFrameHeadersComplete().
-  bool HandleControlFrameHeadersData(const char* headers_data,
-                                     size_t headers_data_length) override;
-
-  // Called after a headers block has been completely delivered via
-  // HandleControlFrameHeadersData(). Returns false if an error
-  // occurred.  |compressed_len| if non-null will be set to the size
-  // of the encoded buffered block that was accumulated in
-  // HandleControlFrameHeadersData(), to support subsequent
-  // calculation of compression percentage. Clears |handler_|.
-  // TODO(jgraettinger): A
-  // future version of this method will simply deliver the Cookie
-  // header (which has been incrementally reconstructed) and notify
-  // the visitor that the block is finished.
-  bool HandleControlFrameHeadersComplete(size_t* compressed_len) override;
-
-  // Accessor for the most recently decoded headers block. Valid until the next
-  // call to HandleControlFrameHeadersData().
-  // TODO(birenroy): Remove this method when all users of HpackDecoder specify
-  // a SpdyHeadersHandlerInterface.
-  const SpdyHeaderBlock& decoded_block() const override;
-
-  void SetHeaderTableDebugVisitor(
-      std::unique_ptr<HpackHeaderTable::DebugVisitorInterface> visitor)
-      override;
-
-  void set_max_decode_buffer_size_bytes(
-      size_t max_decode_buffer_size_bytes) override;
-
-  size_t EstimateMemoryUsage() const override;
-
- private:
-  // Adds the header representation to |decoded_block_|, applying the
-  // following rules:
-  //  - Multiple values of the Cookie header are joined, delmited by '; '.
-  //    This reconstruction is required to properly handle Cookie crumbling
-  //    (as per section 8.1.2.5 in RFC 7540).
-  //  - Multiple values of other headers are joined and delimited by '\0'.
-  //    Note that this may be too accomodating, as the sender's HTTP2 layer
-  //    should have already joined and delimited these values.
-  //
-  // Returns false if a pseudo-header field follows a regular header one, which
-  // MUST be treated as malformed, as per sections 8.1.2.3. of the HTTP2
-  // specification (RFC 7540).
-  //
-  bool HandleHeaderRepresentation(SpdyStringPiece name, SpdyStringPiece value);
-
-  // Handlers for decoding HPACK opcodes and header representations
-  // (or parts thereof). These methods return true on success and
-  // false on error.
-  bool DecodeNextOpcodeWrapper(HpackInputStream* input_stream);
-  bool DecodeNextOpcode(HpackInputStream* input_stream);
-  bool DecodeNextHeaderTableSizeUpdate(HpackInputStream* input_stream);
-  bool DecodeNextIndexedHeader(HpackInputStream* input_stream);
-  bool DecodeNextLiteralHeader(HpackInputStream* input_stream,
-                               bool should_index);
-  bool DecodeNextName(HpackInputStream* input_stream,
-                      SpdyStringPiece* next_name);
-  bool DecodeNextStringLiteral(HpackInputStream* input_stream,
-                               bool is_header_key,  // As distinct from a value.
-                               SpdyStringPiece* output);
-
-  HpackHeaderTable header_table_;
-
-  // TODO(jgraettinger): Buffer for headers data, and storage for the last-
-  // processed headers block. Both will be removed with the switch to
-  // SpdyHeadersHandlerInterface.
-  SpdyString headers_block_buffer_;
-  SpdyHeaderBlock decoded_block_;
-
-  // Scratch space for storing decoded literals.
-  SpdyString key_buffer_, value_buffer_;
-
-  // If non-NULL, handles decoded headers.
-  SpdyHeadersHandlerInterface* handler_;
-  size_t total_header_bytes_;
-
-  // How much encoded data this decoder is willing to buffer.
-  size_t max_decode_buffer_size_bytes_ = 32 * 1024;  // 32 KB
-
-  // Total bytes have been removed from headers_block_buffer_.
-  // Its value is updated during incremental decoding.
-  uint32_t total_parsed_bytes_;
-
-  // Flag to keep track of having seen the header block start.
-  bool header_block_started_;
-
-  // Number of dynamic table size updates seen at the start; a max of two
-  // are permitted.
-  uint8_t size_updates_seen_;
-
-  // Are dynamic table size updates allowed at this point in decoding? True
-  // at the start, but not once we've seen a header entry.
-  bool size_updates_allowed_;
-
-  // Saved value of --chromium_http2_flag_add_hpack_incremental_decode.
-  bool incremental_decode_;
-
-  DISALLOW_COPY_AND_ASSIGN(HpackDecoder);
-};
-
-}  // namespace net
-
-#endif  // NET_SPDY_HPACK_HPACK_DECODER_H_