96 lines
3.7 KiB
C
96 lines
3.7 KiB
C
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/****************************************************************************
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** Copyright (c) 2016, Fougue Ltd. <http://www.fougue.pro>
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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**
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** 2. Redistributions in binary form must reproduce the above
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** copyright notice, this list of conditions and the following
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** disclaimer in the documentation and/or other materials provided
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** with the distribution.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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****************************************************************************/
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#include "zlib_utils.h"
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#include "../error.h"
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/* Converts zlib error to gmio "zlib-specific" error */
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int zlib_error_to_gmio_error(int z_error)
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{
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switch (z_error) {
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case Z_OK: return GMIO_ERROR_OK;
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case Z_ERRNO: return GMIO_ERROR_ZLIB_ERRNO;
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case Z_STREAM_ERROR: return GMIO_ERROR_ZLIB_STREAM;
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case Z_DATA_ERROR: return GMIO_ERROR_ZLIB_DATA;
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case Z_MEM_ERROR: return GMIO_ERROR_ZLIB_MEM;
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case Z_BUF_ERROR: return GMIO_ERROR_ZLIB_BUF;
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case Z_VERSION_ERROR: return GMIO_ERROR_ZLIB_VERSION;
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}
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return GMIO_ERROR_UNKNOWN;
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}
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static int gmio_to_zlib_compress_level(int gmio_compress_level)
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{
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if (gmio_compress_level == GMIO_ZLIB_COMPRESS_LEVEL_DEFAULT)
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return Z_DEFAULT_COMPRESSION;
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else if (gmio_compress_level == GMIO_ZLIB_COMPRESS_LEVEL_NONE)
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return Z_NO_COMPRESSION;
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return gmio_compress_level;
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}
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static int gmio_to_zlib_compress_memusage(int gmio_compress_memusage)
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{
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if (gmio_compress_memusage == 0)
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return 8;
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return gmio_compress_memusage;
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}
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int gmio_zlib_compress_init(
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struct z_stream_s* z_stream,
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const struct gmio_zlib_compress_options* z_opts)
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{
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const int zlib_compress_level =
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gmio_to_zlib_compress_level(z_opts->level);
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const int zlib_compress_memusage =
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gmio_to_zlib_compress_memusage(z_opts->memory_usage);
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const int z_init_error =
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deflateInit2_(
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z_stream,
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zlib_compress_level,
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Z_DEFLATED, /* Method */
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15, /* Window bits(default value) */
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zlib_compress_memusage,
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z_opts->strategy,
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ZLIB_VERSION,
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sizeof(struct z_stream_s));
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return zlib_error_to_gmio_error(z_init_error);
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}
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bool gmio_check_zlib_compress_options(
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int* error, const struct gmio_zlib_compress_options* z_opts)
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{
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if (z_opts != NULL) {
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if (!(-1 <= z_opts->level && z_opts->level <= 9))
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*error = GMIO_ERROR_ZLIB_INVALID_COMPRESS_LEVEL;
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if (!(0 <= z_opts->memory_usage && z_opts->memory_usage <= 9))
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*error = GMIO_ERROR_ZLIB_INVALID_COMPRESS_MEMORY_USAGE;
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}
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return gmio_no_error(*error);
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}
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