1 /* 2 * libwebsockets - small server side websockets and web server implementation 3 * 4 * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com> 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to 8 * deal in the Software without restriction, including without limitation the 9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 22 * IN THE SOFTWARE. 23 * 24 * This is included from private-lib-core.h if LWS_WITH_HTTP_STREAM_COMPRESSION 25 */ 26 27 #if defined(LWS_WITH_MINIZ) 28 #include <miniz.h> 29 #else 30 #include <zlib.h> 31 #endif 32 #if defined(LWS_WITH_HTTP_BROTLI) 33 #include <brotli/encode.h> 34 #include <brotli/decode.h> 35 #endif 36 37 /* 38 * struct holding union of all the available compression methods' context data, 39 * and state if it's compressing or decompressing 40 */ 41 42 typedef struct lws_compression_ctx { 43 union { 44 45 #if defined(LWS_WITH_HTTP_BROTLI) 46 BrotliEncoderState *br_en; 47 BrotliDecoderState *br_de; 48 #endif 49 z_stream *deflate; 50 void *generic_ctx_ptr; 51 } u; 52 53 struct lws_buflist *buflist_comp; 54 55 unsigned int is_decompression:1; 56 unsigned int final_on_input_side:1; 57 unsigned int may_have_more:1; 58 unsigned int chunking:1; 59 } lws_comp_ctx_t; 60 61 /* generic structure defining the interface to a compression method */ 62 63 struct lws_compression_support { 64 /** compression name as used by, eg, content-ecoding */ 65 const char *encoding_name; 66 /** create a compression context for the compression method, or NULL */ 67 int (*init_compression)(lws_comp_ctx_t *ctx, int decomp); 68 /** pass data into the context to be processed */ 69 int (*process)(lws_comp_ctx_t *ctx, const void *in, size_t *ilen_iused, 70 void *out, size_t *olen_oused); 71 /** destroy the de/compression context */ 72 void (*destroy)(lws_comp_ctx_t *ctx); 73 }; 74 75 extern struct lws_compression_support lcs_deflate; 76 extern struct lws_compression_support lcs_brotli; 77 78 int 79 lws_http_compression_validate(struct lws *wsi); 80 81 int 82 lws_http_compression_transform(struct lws *wsi, unsigned char *buf, 83 size_t len, enum lws_write_protocol *wp, 84 unsigned char **outbuf, size_t *olen_oused); 85 86 void 87 lws_http_compression_destroy(struct lws *wsi); 88