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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef NET_SPDY_HPACK_CONSTANTS_H_ | |
| 6 #define NET_SPDY_HPACK_CONSTANTS_H_ | |
| 7 | |
| 8 #include <vector> | |
| 9 | |
| 10 #include "base/basictypes.h" | |
| 11 #include "net/base/net_export.h" | |
| 12 | |
| 13 // All section references below are to | |
| 14 // http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-08 | |
| 15 | |
| 16 namespace net { | |
| 17 | |
| 18 // An HpackPrefix signifies |bits| stored in the top |bit_size| bits | |
| 19 // of an octet. | |
| 20 struct HpackPrefix { | |
| 21 uint8 bits; | |
| 22 size_t bit_size; | |
| 23 }; | |
| 24 | |
| 25 // Represents a symbol and its Huffman code (stored in most-significant bits). | |
| 26 struct HpackHuffmanSymbol { | |
| 27 uint32 code; | |
| 28 uint8 length; | |
| 29 uint16 id; | |
| 30 }; | |
| 31 | |
| 32 // An entry in the static table. Must be a POD in order to avoid static | |
| 33 // initializers, i.e. no user-defined constructors or destructors. | |
| 34 struct HpackStaticEntry { | |
| 35 const char* const name; | |
| 36 const size_t name_len; | |
| 37 const char* const value; | |
| 38 const size_t value_len; | |
| 39 }; | |
| 40 | |
| 41 class HpackHuffmanTable; | |
| 42 class HpackStaticTable; | |
| 43 | |
| 44 const uint32 kDefaultHeaderTableSizeSetting = 4096; | |
| 45 | |
| 46 // Largest string literal an HpackDecoder/HpackEncoder will attempt to process | |
| 47 // before returning an error. | |
| 48 const uint32 kDefaultMaxStringLiteralSize = 16 * 1024; | |
| 49 | |
| 50 // Maximum amount of encoded header buffer HpackDecoder will retain before | |
| 51 // returning an error. | |
| 52 // TODO(jgraettinger): Remove with SpdyHeadersHandlerInterface switch. | |
| 53 const uint32 kMaxDecodeBufferSize = 32 * 1024; | |
| 54 | |
| 55 // 6.2: Flag for a string literal that is stored unmodified (i.e., | |
| 56 // without Huffman encoding). | |
| 57 const HpackPrefix kStringLiteralIdentityEncoded = { 0x0, 1 }; | |
| 58 | |
| 59 // 6.2: Flag for a Huffman-coded string literal. | |
| 60 const HpackPrefix kStringLiteralHuffmanEncoded = { 0x1, 1 }; | |
| 61 | |
| 62 // 7.1: Opcode for an indexed header field. | |
| 63 const HpackPrefix kIndexedOpcode = { 0x1, 1 }; | |
| 64 | |
| 65 // 7.2.1: Opcode for a literal header field with incremental indexing. | |
| 66 const HpackPrefix kLiteralIncrementalIndexOpcode = { 0x1, 2 }; | |
| 67 | |
| 68 // 7.2.2: Opcode for a literal header field without indexing. | |
| 69 const HpackPrefix kLiteralNoIndexOpcode = { 0x0, 4 }; | |
| 70 | |
| 71 // 7.2.3: Opcode for a literal header field which is never indexed. | |
| 72 const HpackPrefix kLiteralNeverIndexOpcode = { 0x1, 4 }; | |
| 73 | |
| 74 // 7.3: Opcode for maximum header table size update. Begins a varint-encoded | |
| 75 // table size with a 5-bit prefix. | |
| 76 const HpackPrefix kHeaderTableSizeUpdateOpcode = { 0x1, 3 }; | |
| 77 | |
| 78 // Returns symbol code table from "Appendix C. Huffman Code". | |
| 79 NET_EXPORT_PRIVATE std::vector<HpackHuffmanSymbol> HpackHuffmanCode(); | |
| 80 | |
| 81 // Returns static table from "Appendix B. Static Table Definition". | |
| 82 NET_EXPORT_PRIVATE std::vector<HpackStaticEntry> HpackStaticTableVector(); | |
| 83 | |
| 84 // Returns a HpackHuffmanTable instance initialized with |kHpackHuffmanCode|. | |
| 85 // The instance is read-only, has static lifetime, and is safe to share amoung | |
| 86 // threads. This function is thread-safe. | |
| 87 NET_EXPORT_PRIVATE const HpackHuffmanTable& ObtainHpackHuffmanTable(); | |
| 88 | |
| 89 // Returns a HpackStaticTable instance initialized with |kHpackStaticTable|. | |
| 90 // The instance is read-only, has static lifetime, and is safe to share amoung | |
| 91 // threads. This function is thread-safe. | |
| 92 NET_EXPORT_PRIVATE const HpackStaticTable& ObtainHpackStaticTable(); | |
| 93 | |
| 94 // Pseudo-headers start with a colon. (HTTP2 8.1.2.1., HPACK 3.1.) | |
| 95 const char kPseudoHeaderPrefix = ':'; | |
| 96 | |
| 97 } // namespace net | |
| 98 | |
| 99 #endif // NET_SPDY_HPACK_CONSTANTS_H_ | |
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Chromium Code Reviews
Issue 992733002:
Remove //net (except for Android test stuff) and sdch (Closed)
Base URL: git@github.com:domokit/mojo.git@master