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86 lines
3.3 KiB
C++
86 lines
3.3 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_HTTP2_HPACK_DECODER_HPACK_ENTRY_DECODER_H_
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#define NET_HTTP2_HPACK_DECODER_HPACK_ENTRY_DECODER_H_
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// HpackEntryDecoder decodes a single HPACK entry (i.e. one header or one
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// dynamic table size update), in a resumable fashion. The first call, Start(),
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// must provide a non-empty decode buffer. Continue with calls to Resume() if
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// Start, and any subsequent calls to Resume, returns kDecodeInProgress.
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#include "base/logging.h"
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#include "net/http2/decoder/decode_buffer.h"
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#include "net/http2/decoder/decode_status.h"
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#include "net/http2/hpack/decoder/hpack_entry_decoder_listener.h"
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#include "net/http2/hpack/decoder/hpack_entry_type_decoder.h"
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#include "net/http2/hpack/decoder/hpack_string_decoder.h"
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#include "net/http2/hpack/http2_hpack_constants.h"
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#include "net/http2/platform/api/http2_export.h"
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#include "net/http2/platform/api/http2_string.h"
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namespace net {
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class HTTP2_EXPORT_PRIVATE HpackEntryDecoder {
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public:
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enum class EntryDecoderState {
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// Have started decoding the type/varint, but didn't finish on the previous
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// attempt. Next state is kResumeDecodingType or kDecodedType.
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kResumeDecodingType,
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// Have just finished decoding the type/varint. Final state if the type is
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// kIndexedHeader or kDynamicTableSizeUpdate. Otherwise, the next state is
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// kStartDecodingName (if the varint is 0), else kStartDecodingValue.
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kDecodedType,
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// Ready to start decoding the literal name of a header entry. Next state
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// is kResumeDecodingName (if the name is split across decode buffers),
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// else kStartDecodingValue.
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kStartDecodingName,
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// Resume decoding the literal name of a header that is split across decode
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// buffers.
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kResumeDecodingName,
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// Ready to start decoding the literal value of a header entry. Final state
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// if the value string is entirely in the decode buffer, else the next state
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// is kResumeDecodingValue.
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kStartDecodingValue,
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// Resume decoding the literal value of a header that is split across decode
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// buffers.
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kResumeDecodingValue,
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};
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// Only call when the decode buffer has data (i.e. HpackBlockDecoder must
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// not call until there is data).
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DecodeStatus Start(DecodeBuffer* db, HpackEntryDecoderListener* listener);
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// Only call Resume if the previous call (Start or Resume) returned
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// kDecodeInProgress; Resume is also called from Start when it has succeeded
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// in decoding the entry type and its varint.
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DecodeStatus Resume(DecodeBuffer* db, HpackEntryDecoderListener* listener);
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Http2String DebugString() const;
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void OutputDebugString(std::ostream& out) const;
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private:
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// Implements handling state kDecodedType.
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bool DispatchOnType(HpackEntryDecoderListener* listener);
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HpackEntryTypeDecoder entry_type_decoder_;
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HpackStringDecoder string_decoder_;
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EntryDecoderState state_ = EntryDecoderState();
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};
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HTTP2_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out,
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const HpackEntryDecoder& v);
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HTTP2_EXPORT_PRIVATE std::ostream& operator<<(
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std::ostream& out,
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HpackEntryDecoder::EntryDecoderState state);
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} // namespace net
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#endif // NET_HTTP2_HPACK_DECODER_HPACK_ENTRY_DECODER_H_
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