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80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2018 Andy Green <andy@warmcat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation:
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*
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* This is included from core/private.h if LWS_WITH_HTTP_STREAM_COMPRESSION
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*/
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#include <zlib.h>
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#if defined(LWS_WITH_HTTP_BROTLI)
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#include <brotli/encode.h>
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#include <brotli/decode.h>
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#endif
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/*
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* struct holding union of all the available compression methods' context data,
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* and state if it's compressing or decompressing
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*/
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typedef struct lws_compression_ctx {
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union {
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#if defined(LWS_WITH_HTTP_BROTLI)
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BrotliEncoderState *br_en;
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BrotliDecoderState *br_de;
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#endif
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z_stream *deflate;
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void *generic_ctx_ptr;
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} u;
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struct lws_buflist *buflist_comp;
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unsigned int is_decompression:1;
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unsigned int final_on_input_side:1;
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unsigned int may_have_more:1;
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unsigned int chunking:1;
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} lws_comp_ctx_t;
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/* generic structure defining the interface to a compression method */
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struct lws_compression_support {
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/** compression name as used by, eg, content-ecoding */
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const char *encoding_name;
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/** create a compression context for the compression method, or NULL */
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int (*init_compression)(lws_comp_ctx_t *ctx, int decomp);
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/** pass data into the context to be processed */
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int (*process)(lws_comp_ctx_t *ctx, const void *in, size_t *ilen_iused,
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void *out, size_t *olen_oused);
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/** destroy the de/compression context */
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void (*destroy)(lws_comp_ctx_t *ctx);
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};
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extern struct lws_compression_support lcs_deflate;
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extern struct lws_compression_support lcs_brotli;
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int
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lws_http_compression_validate(struct lws *wsi);
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int
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lws_http_compression_transform(struct lws *wsi, unsigned char *buf,
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size_t len, enum lws_write_protocol *wp,
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unsigned char **outbuf, size_t *olen_oused);
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void
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lws_http_compression_destroy(struct lws *wsi);
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