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94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>
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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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* 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <err.h>
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#include <limits.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <zstd.h>
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#include "mkuzip.h"
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#include "mkuz_blk.h"
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#include "mkuz_zstd.h"
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size_t
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mkuz_zstd_cbound(size_t blksz)
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{
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return (ZSTD_compressBound(blksz));
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}
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void *
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mkuz_zstd_init(int *comp_level)
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{
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ZSTD_CCtx *cctx;
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size_t rc;
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/* Default chosen for near-parity with mkuzip zlib default. */
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if (*comp_level == USE_DEFAULT_LEVEL)
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*comp_level = 9;
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if (*comp_level < ZSTD_minCLevel() || *comp_level == 0 ||
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*comp_level > ZSTD_maxCLevel())
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errx(1, "provided compression level %d is invalid",
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*comp_level);
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cctx = ZSTD_createCCtx();
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if (cctx == NULL)
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errx(1, "could not allocate Zstd context");
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rc = ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel,
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*comp_level);
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if (ZSTD_isError(rc))
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errx(1, "Could not set zstd compression level %d: %s",
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*comp_level, ZSTD_getErrorName(rc));
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rc = ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 1);
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if (ZSTD_isError(rc))
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errx(1, "Could not enable zstd checksum: %s",
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ZSTD_getErrorName(rc));
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return (cctx);
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}
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void
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mkuz_zstd_compress(void *p, const struct mkuz_blk *iblk, struct mkuz_blk *oblk)
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{
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ZSTD_CCtx *cctx;
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size_t rc;
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cctx = p;
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rc = ZSTD_compress2(cctx, oblk->data, oblk->alen, iblk->data,
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iblk->info.len);
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if (ZSTD_isError(rc))
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errx(1, "could not compress data: ZSTD_compress2: %s",
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ZSTD_getErrorName(rc));
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oblk->info.len = rc;
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}
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