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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_HPACK_CONSTANTS_H_ | |
| 6 #define NET_SPDY_HPACK_HPACK_CONSTANTS_H_ | |
| 7 | |
| 8 #include <stddef.h> | |
| 9 #include <stdint.h> | |
| 10 | |
| 11 #include <vector> | |
| 12 | |
| 13 #include "net/base/net_export.h" | |
| 14 | |
| 15 // All section references below are to | |
| 16 // http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-08 | |
| 17 | |
| 18 namespace net { | |
| 19 | |
| 20 // An HpackPrefix signifies |bits| stored in the top |bit_size| bits | |
| 21 // of an octet. | |
| 22 struct HpackPrefix { | |
| 23 uint8_t bits; | |
| 24 size_t bit_size; | |
| 25 }; | |
| 26 | |
| 27 // Represents a symbol and its Huffman code (stored in most-significant bits). | |
| 28 struct HpackHuffmanSymbol { | |
| 29 uint32_t code; | |
| 30 uint8_t length; | |
| 31 uint16_t id; | |
| 32 }; | |
| 33 | |
| 34 // An entry in the static table. Must be a POD in order to avoid static | |
| 35 // initializers, i.e. no user-defined constructors or destructors. | |
| 36 struct HpackStaticEntry { | |
| 37 const char* const name; | |
| 38 const size_t name_len; | |
| 39 const char* const value; | |
| 40 const size_t value_len; | |
| 41 }; | |
| 42 | |
| 43 class HpackHuffmanTable; | |
| 44 class HpackStaticTable; | |
| 45 | |
| 46 // Defined in RFC 7540 section 6.5.2. | |
| 47 const uint32_t kDefaultHeaderTableSizeSetting = 4096; | |
| 48 | |
| 49 // 6.2: Flag for a string literal that is stored unmodified (i.e., | |
| 50 // without Huffman encoding). | |
| 51 const HpackPrefix kStringLiteralIdentityEncoded = {0x0, 1}; | |
| 52 | |
| 53 // 6.2: Flag for a Huffman-coded string literal. | |
| 54 const HpackPrefix kStringLiteralHuffmanEncoded = {0x1, 1}; | |
| 55 | |
| 56 // 7.1: Opcode for an indexed header field. | |
| 57 const HpackPrefix kIndexedOpcode = {0x1, 1}; | |
| 58 | |
| 59 // 7.2.1: Opcode for a literal header field with incremental indexing. | |
| 60 const HpackPrefix kLiteralIncrementalIndexOpcode = {0x1, 2}; | |
| 61 | |
| 62 // 7.2.2: Opcode for a literal header field without indexing. | |
| 63 const HpackPrefix kLiteralNoIndexOpcode = {0x0, 4}; | |
| 64 | |
| 65 // 7.2.3: Opcode for a literal header field which is never indexed. | |
| 66 const HpackPrefix kLiteralNeverIndexOpcode = {0x1, 4}; | |
| 67 | |
| 68 // 7.3: Opcode for maximum header table size update. Begins a varint-encoded | |
| 69 // table size with a 5-bit prefix. | |
| 70 const HpackPrefix kHeaderTableSizeUpdateOpcode = {0x1, 3}; | |
| 71 | |
| 72 // Returns symbol code table from "Appendix C. Huffman Code". | |
| 73 NET_EXPORT_PRIVATE std::vector<HpackHuffmanSymbol> HpackHuffmanCode(); | |
| 74 | |
| 75 // Returns static table from "Appendix B. Static Table Definition". | |
| 76 NET_EXPORT_PRIVATE std::vector<HpackStaticEntry> HpackStaticTableVector(); | |
| 77 | |
| 78 // Returns a HpackHuffmanTable instance initialized with |kHpackHuffmanCode|. | |
| 79 // The instance is read-only, has static lifetime, and is safe to share amoung | |
| 80 // threads. This function is thread-safe. | |
| 81 NET_EXPORT_PRIVATE const HpackHuffmanTable& ObtainHpackHuffmanTable(); | |
| 82 | |
| 83 // Returns a HpackStaticTable instance initialized with |kHpackStaticTable|. | |
| 84 // The instance is read-only, has static lifetime, and is safe to share amoung | |
| 85 // threads. This function is thread-safe. | |
| 86 NET_EXPORT_PRIVATE const HpackStaticTable& ObtainHpackStaticTable(); | |
| 87 | |
| 88 // Pseudo-headers start with a colon. (HTTP2 8.1.2.1., HPACK 3.1.) | |
| 89 const char kPseudoHeaderPrefix = ':'; | |
| 90 | |
| 91 } // namespace net | |
| 92 | |
| 93 #endif // NET_SPDY_HPACK_HPACK_CONSTANTS_H_ | |
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Chromium Code Reviews
Issue 2832973003:
Split net/spdy into core and chromium subdirectories. (Closed)
