mirror of
https://github.com/warmcat/libwebsockets.git
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122 lines
2.9 KiB
C
122 lines
2.9 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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#include "core/private.h"
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static int
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lcs_init_compression_brotli(lws_comp_ctx_t *ctx, int decomp)
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{
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ctx->is_decompression = decomp;
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if (!decomp) {
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ctx->u.br_en = BrotliEncoderCreateInstance(NULL, NULL, NULL);
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if (ctx->u.br_en) {
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BrotliEncoderSetParameter(ctx->u.br_en,
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BROTLI_PARAM_MODE, BROTLI_MODE_TEXT);
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BrotliEncoderSetParameter(ctx->u.br_en,
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BROTLI_PARAM_QUALITY, BROTLI_MIN_QUALITY);
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}
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}
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else
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ctx->u.br_de = BrotliDecoderCreateInstance(NULL, NULL, NULL);
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return !ctx->u.br_de;
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}
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static int
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lcs_process_brotli(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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{
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size_t a_in, a_out, t_out;
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const uint8_t *n_in;
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uint8_t *n_out;
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int n;
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n_in = (void *)in;
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a_in = *ilen_iused;
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a_out = *olen_oused;
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n_out = out;
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t_out = 0;
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if (!ctx->is_decompression) {
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if (!a_in && !BrotliEncoderHasMoreOutput(ctx->u.br_en)) {
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*olen_oused = 0;
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goto bail;
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}
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n = BROTLI_OPERATION_PROCESS;
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if (!ctx->buflist_comp && ctx->final_on_input_side)
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n = BROTLI_OPERATION_FINISH;
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if (BrotliEncoderCompressStream(ctx->u.br_en, n, &a_in, &n_in,
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&a_out, &n_out, &t_out) ==
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BROTLI_FALSE) {
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lwsl_err("brotli encode failed\n");
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return -1;
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}
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ctx->may_have_more = !a_out;
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} else {
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n = BrotliDecoderDecompressStream(ctx->u.br_de, &a_in, &n_in,
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&a_out, &n_out, &t_out);
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switch (n) {
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case BROTLI_DECODER_RESULT_ERROR:
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lwsl_err("brotli decoder error\n");
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return -1;
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}
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}
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*ilen_iused -= a_in;
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*olen_oused -= a_out;
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bail:
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if (!ctx->is_decompression)
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return BrotliEncoderIsFinished(ctx->u.br_en);
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else
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return BrotliDecoderIsFinished(ctx->u.br_de);
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}
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static void
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lcs_destroy_brotli(lws_comp_ctx_t *ctx)
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{
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if (!ctx)
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return;
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if (!(*ctx).is_decompression)
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BrotliEncoderDestroyInstance((*ctx).u.br_en);
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else
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BrotliDecoderDestroyInstance((*ctx).u.br_de);
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(*ctx).u.generic_ctx_ptr = NULL;
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}
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struct lws_compression_support lcs_brotli = {
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/* .encoding_name */ "br",
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/* .init_compression */ lcs_init_compression_brotli,
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/* .process */ lcs_process_brotli,
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/* .destroy */ lcs_destroy_brotli,
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};
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