| 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/detail/config.hpp> | ||
| 15 | #include <boost/http_proto/context.hpp> | ||
| 16 | #include <boost/http_proto/filter.hpp> | ||
| 17 | #include <boost/http_proto/service/service.hpp> | ||
| 18 | #include <boost/http_proto/detail/workspace.hpp> | ||
| 19 | |||
| 20 | namespace boost { | ||
| 21 | namespace http_proto { | ||
| 22 | namespace zlib { | ||
| 23 | |||
| 24 | struct decoder_config | ||
| 25 | { | ||
| 26 | unsigned max_window_bits = 15; | ||
| 27 | unsigned mem_level = 8; | ||
| 28 | }; | ||
| 29 | |||
| 30 | //------------------------------------------------ | ||
| 31 | |||
| 32 | constexpr | ||
| 33 | inline | ||
| 34 | std::size_t | ||
| 35 | 24 | encoding_size_hint(decoder_config cfg = {}) noexcept | |
| 36 | { | ||
| 37 | // from: https://www.zlib.net/zlib_tech.html | ||
| 38 | // | ||
| 39 | // Memory Footprint | ||
| 40 | // | ||
| 41 | // zlib's memory footprint can also be specified fairly | ||
| 42 | // precisely. It is larger for compression than for | ||
| 43 | // decompression, and the exact requirements depend on | ||
| 44 | // how the library was compiled. | ||
| 45 | // | ||
| 46 | // The memory requirements for compression depend on two | ||
| 47 | // parameters, windowBits and memLevel: | ||
| 48 | // deflate memory usage (bytes) = (1 << (windowBits+2)) + (1 << (memLevel+9)) + 6 KB | ||
| 49 | return | ||
| 50 | 24 | (1 << (cfg.max_window_bits + 2)) + | |
| 51 | 24 | (1 << (cfg.mem_level + 9)) + | |
| 52 | 24 | (6 * 1024); | |
| 53 | } | ||
| 54 | |||
| 55 | void BOOST_HTTP_PROTO_ZLIB_DECL | ||
| 56 | install_deflate_encoder(context& ctx); | ||
| 57 | |||
| 58 | } // zlib | ||
| 59 | } // http_proto | ||
| 60 | } // boost | ||
| 61 | |||
| 62 | #endif | ||
| 63 |