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Diffstat (limited to 'sys/contrib/openzfs/include/sys/zstd/zstd.h')
| -rw-r--r-- | sys/contrib/openzfs/include/sys/zstd/zstd.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/include/sys/zstd/zstd.h b/sys/contrib/openzfs/include/sys/zstd/zstd.h new file mode 100644 index 000000000000..f965df31988c --- /dev/null +++ b/sys/contrib/openzfs/include/sys/zstd/zstd.h @@ -0,0 +1,98 @@ +/* + * BSD 3-Clause New License (https://spdx.org/licenses/BSD-3-Clause.html) + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * 3. Neither the name of the copyright holder nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * Copyright (c) 2016-2018, Klara Inc. + * Copyright (c) 2016-2018, Allan Jude + * Copyright (c) 2018-2020, Sebastian Gottschall + * Copyright (c) 2019-2020, Michael Niewöhner + * Copyright (c) 2020, The FreeBSD Foundation [1] + * + * [1] Portions of this software were developed by Allan Jude + * under sponsorship from the FreeBSD Foundation. + */ + +#ifndef _ZFS_ZSTD_H +#define _ZFS_ZSTD_H + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * ZSTD block header + * NOTE: all fields in this header are in big endian order. + */ +typedef struct zfs_zstd_header { + /* Compressed size of data */ + uint32_t c_len; + + /* + * Version and compression level + * We use a union to be able to big endian encode a single 32 bit + * unsigned integer, but still access the individual bitmasked + * components easily. + */ + union { + uint32_t raw_version_level; + struct { + uint32_t version : 24; + uint8_t level; + }; + }; + + char data[]; +} zfs_zstdhdr_t; + +/* + * kstat helper macros + */ +#define ZSTDSTAT(stat) (zstd_stats.stat.value.ui64) +#define ZSTDSTAT_INCR(stat, val) \ + atomic_add_64(&zstd_stats.stat.value.ui64, (val)) +#define ZSTDSTAT_BUMP(stat) ZSTDSTAT_INCR(stat, 1) + +/* (de)init for user space / kernel emulation */ +int zstd_init(void); +void zstd_fini(void); + +size_t zfs_zstd_compress(void *s_start, void *d_start, size_t s_len, + size_t d_len, int level); +int zfs_zstd_get_level(void *s_start, size_t s_len, uint8_t *level); +int zfs_zstd_decompress_level(void *s_start, void *d_start, size_t s_len, + size_t d_len, uint8_t *level); +int zfs_zstd_decompress(void *s_start, void *d_start, size_t s_len, + size_t d_len, int n); + +#ifdef __cplusplus +} +#endif + +#endif /* _ZFS_ZSTD_H */ |