| // Copyright 2016 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 QUICHE_HTTP2_HPACK_HUFFMAN_HPACK_HUFFMAN_ENCODER_H_ |
| #define QUICHE_HTTP2_HPACK_HUFFMAN_HPACK_HUFFMAN_ENCODER_H_ |
| |
| // Functions supporting the encoding of strings using the HPACK-defined Huffman |
| // table. |
| |
| #include <cstddef> // For size_t |
| #include <string> |
| |
| #include "net/third_party/quiche/src/http2/platform/api/http2_export.h" |
| #include "net/third_party/quiche/src/http2/platform/api/http2_string_piece.h" |
| |
| namespace http2 { |
| |
| // Returns the size of the Huffman encoding of |plain|, which may be greater |
| // than plain.size(). Mostly present for testing. |
| HTTP2_EXPORT_PRIVATE size_t ExactHuffmanSize(Http2StringPiece plain); |
| |
| // Returns the size of the Huffman encoding of |plain|, unless it is greater |
| // than or equal to plain.size(), in which case a value greater than or equal to |
| // plain.size() is returned. The advantage of this over ExactHuffmanSize is that |
| // it doesn't read as much of the input string in the event that the string is |
| // not compressible by HuffmanEncode (i.e. when the encoding is longer than the |
| // original string, it stops reading the input string as soon as it knows that). |
| HTTP2_EXPORT_PRIVATE size_t BoundedHuffmanSize(Http2StringPiece plain); |
| |
| // Encode the plain text string |plain| with the Huffman encoding defined in |
| // the HPACK RFC, 7541. |*huffman| does not have to be empty, it is cleared at |
| // the beginning of this function. This allows reusing the same string object |
| // across multiple invocations. |
| HTTP2_EXPORT_PRIVATE void HuffmanEncode(Http2StringPiece plain, |
| std::string* huffman); |
| |
| } // namespace http2 |
| |
| #endif // QUICHE_HTTP2_HPACK_HUFFMAN_HPACK_HUFFMAN_ENCODER_H_ |