| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2021 Vinnie Falco (vinnie.falco@gmail.com) | ||
| 3 | // Copyright (c) 2024 Christian Mazakas | ||
| 4 | // | ||
| 5 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 6 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 7 | // | ||
| 8 | // Official repository: https://github.com/cppalliance/http_proto | ||
| 9 | // | ||
| 10 | |||
| 11 | #ifndef BOOST_HTTP_PROTO_SERVICE_ZLIB_SERVICE_HPP | ||
| 12 | #define BOOST_HTTP_PROTO_SERVICE_ZLIB_SERVICE_HPP | ||
| 13 | |||
| 14 | #include <boost/http_proto/context.hpp> | ||
| 15 | #include <boost/http_proto/detail/config.hpp> | ||
| 16 | #include <boost/http_proto/detail/workspace.hpp> | ||
| 17 | #include <boost/http_proto/service/service.hpp> | ||
| 18 | |||
| 19 | #include <boost/buffers/const_buffer.hpp> | ||
| 20 | #include <boost/buffers/mutable_buffer.hpp> | ||
| 21 | |||
| 22 | namespace boost { | ||
| 23 | namespace http_proto { | ||
| 24 | namespace zlib { | ||
| 25 | |||
| 26 | struct decoder_config | ||
| 27 | { | ||
| 28 | unsigned max_window_bits = 15; | ||
| 29 | unsigned mem_level = 8; | ||
| 30 | }; | ||
| 31 | |||
| 32 | //------------------------------------------------ | ||
| 33 | |||
| 34 | constexpr | ||
| 35 | inline | ||
| 36 | std::size_t | ||
| 37 | 24 | encoding_size_hint(decoder_config cfg = {}) noexcept | |
| 38 | { | ||
| 39 | // from: https://www.zlib.net/zlib_tech.html | ||
| 40 | // | ||
| 41 | // Memory Footprint | ||
| 42 | // | ||
| 43 | // zlib's memory footprint can also be specified fairly | ||
| 44 | // precisely. It is larger for compression than for | ||
| 45 | // decompression, and the exact requirements depend on | ||
| 46 | // how the library was compiled. | ||
| 47 | // | ||
| 48 | // The memory requirements for compression depend on two | ||
| 49 | // parameters, windowBits and memLevel: | ||
| 50 | // deflate memory usage (bytes) = (1 << (windowBits+2)) + (1 << (memLevel+9)) + 6 KB | ||
| 51 | return | ||
| 52 | 24 | (1 << (cfg.max_window_bits + 2)) + | |
| 53 | 24 | (1 << (cfg.mem_level + 9)) + | |
| 54 | 24 | (6 * 1024); | |
| 55 | } | ||
| 56 | |||
| 57 | struct BOOST_HTTP_PROTO_ZLIB_DECL | ||
| 58 | service | ||
| 59 | : http_proto::service | ||
| 60 | { | ||
| 61 | struct stream | ||
| 62 | { | ||
| 63 | enum class flush | ||
| 64 | { | ||
| 65 | none, | ||
| 66 | partial, | ||
| 67 | sync, | ||
| 68 | full, | ||
| 69 | finish, | ||
| 70 | block, | ||
| 71 | trees | ||
| 72 | }; | ||
| 73 | |||
| 74 | struct results | ||
| 75 | { | ||
| 76 | std::size_t out_bytes; | ||
| 77 | std::size_t in_bytes; | ||
| 78 | system::error_code ec; | ||
| 79 | bool finished; | ||
| 80 | }; | ||
| 81 | |||
| 82 | virtual results | ||
| 83 | write( | ||
| 84 | buffers::mutable_buffer out, | ||
| 85 | buffers::const_buffer in, | ||
| 86 | flush) noexcept = 0; | ||
| 87 | }; | ||
| 88 | |||
| 89 | virtual | ||
| 90 | std::size_t | ||
| 91 | space_needed() const noexcept = 0; | ||
| 92 | |||
| 93 | virtual stream& | ||
| 94 | make_deflator( | ||
| 95 | http_proto::detail::workspace& ws, | ||
| 96 | int level, | ||
| 97 | int window_bits, | ||
| 98 | int mem_level) const = 0; | ||
| 99 | |||
| 100 | virtual stream& | ||
| 101 | make_inflator( | ||
| 102 | http_proto::detail::workspace& ws, | ||
| 103 | int window_bits) const = 0; | ||
| 104 | }; | ||
| 105 | |||
| 106 | void BOOST_HTTP_PROTO_ZLIB_DECL | ||
| 107 | install_service(context& ctx); | ||
| 108 | |||
| 109 | } // zlib | ||
| 110 | } // http_proto | ||
| 111 | } // boost | ||
| 112 | |||
| 113 | #endif | ||
| 114 |