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103 lines
3.5 KiB
C++
103 lines
3.5 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_DECODER_STRING_BUFFER_H_
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#define NET_HTTP2_HPACK_DECODER_HPACK_DECODER_STRING_BUFFER_H_
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// HpackDecoderStringBuffer helps an HPACK decoder to avoid copies of a string
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// literal (name or value) except when necessary (e.g. when split across two
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// or more HPACK block fragments).
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#include <stddef.h>
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#include <ostream>
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#include "base/macros.h"
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#include "net/http2/hpack/huffman/hpack_huffman_decoder.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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#include "net/http2/platform/api/http2_string_piece.h"
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namespace net {
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class HTTP2_EXPORT_PRIVATE HpackDecoderStringBuffer {
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public:
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enum class State : uint8_t { RESET, COLLECTING, COMPLETE };
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enum class Backing : uint8_t { RESET, UNBUFFERED, BUFFERED, STATIC };
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HpackDecoderStringBuffer();
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~HpackDecoderStringBuffer();
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void Reset();
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void Set(Http2StringPiece value, bool is_static);
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// Note that for Huffman encoded strings the length of the string after
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// decoding may be larger (expected), the same or even smaller; the latter
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// are unlikely, but possible if the encoder makes odd choices.
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void OnStart(bool huffman_encoded, size_t len);
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bool OnData(const char* data, size_t len);
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bool OnEnd();
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void BufferStringIfUnbuffered();
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bool IsBuffered() const;
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size_t BufferedLength() const;
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// Accessors for the completely collected string (i.e. Set or OnEnd has just
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// been called, and no reset of the state has occurred).
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// Returns a Http2StringPiece pointing to the backing store for the string,
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// either the internal buffer or the original transport buffer (e.g. for a
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// literal value that wasn't Huffman encoded, and that wasn't split across
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// transport buffers).
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Http2StringPiece str() const;
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// Returns the completely collected string by value, using std::move in an
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// effort to avoid unnecessary copies. ReleaseString() must not be called
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// unless the string has been buffered (to avoid forcing a potentially
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// unnecessary copy). ReleaseString() also resets the instance so that it can
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// be used to collect another string.
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Http2String ReleaseString();
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State state_for_testing() const { return state_; }
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Backing backing_for_testing() const { return backing_; }
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void OutputDebugStringTo(std::ostream& out) const;
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// Returns the estimate of dynamically allocated memory in bytes.
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size_t EstimateMemoryUsage() const;
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private:
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// Storage for the string being buffered, if buffering is necessary
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// (e.g. if Huffman encoded, buffer_ is storage for the decoded string).
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Http2String buffer_;
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// The Http2StringPiece to be returned by HpackDecoderStringBuffer::str(). If
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// a string has been collected, but not buffered, value_ points to that
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// string.
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Http2StringPiece value_;
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// The decoder to use if the string is Huffman encoded.
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HpackHuffmanDecoder decoder_;
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// Count of bytes not yet passed to OnData.
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size_t remaining_len_;
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// Is the HPACK string Huffman encoded?
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bool is_huffman_encoded_;
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// State of the string decoding process.
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State state_;
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// Where is the string stored?
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Backing backing_;
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DISALLOW_COPY_AND_ASSIGN(HpackDecoderStringBuffer);
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};
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HTTP2_EXPORT_PRIVATE std::ostream& operator<<(
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std::ostream& out,
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const HpackDecoderStringBuffer& v);
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} // namespace net
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#endif // NET_HTTP2_HPACK_DECODER_HPACK_DECODER_STRING_BUFFER_H_
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