FreeBSD/Linux Kernel Cross Reference
sys/geom/uzip/g_uzip_zstd.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/errno.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/sysctl.h>
    
    #include <geom/uzip/g_uzip.h>
    #include <geom/uzip/g_uzip_dapi.h>
    #include <geom/uzip/g_uzip_zstd.h>
    
    /*
     * We don't actually need any static-link ABI, just want to use "experimental"
     * custom malloc/free APIs.
     */
    #define ZSTD_STATIC_LINKING_ONLY
    #include <contrib/zstd/lib/zstd.h>
    
    FEATURE(geom_uzip_zstd, "g_uzip Zstd support");
    
    struct g_uzip_zstd {
            struct g_uzip_dapi      guz_pub;
            uint32_t                guz_blksz;
            ZSTD_DCtx               *guz_dctx;
    };
    
    #ifndef container_of
    #define container_of(ptr, type, member)                         \
    ({                                                              \
            const __typeof(((type *)0)->member) *__p = (ptr);       \
            (type *)((uintptr_t)__p - offsetof(type, member));      \
    })
    #endif
    #define to_zstd_softc(zpp)      container_of(zpp, struct g_uzip_zstd, guz_pub)
    
    static int
    guz_zstd_decompress(struct g_uzip_dapi *zpp, const char *gp_name, void *input,
        size_t ilen, void *outputbuf)
    {
            struct g_uzip_zstd *sc;
            size_t rc;
    
            sc = to_zstd_softc(zpp);
            rc = ZSTD_decompressDCtx(sc->guz_dctx, outputbuf, sc->guz_blksz, input,
                ilen);
            if (ZSTD_isError(rc)) {
                    printf("%s: UZIP(zstd) decompress failed: %s\n", gp_name,
                        ZSTD_getErrorName(rc));
                    return (EIO);
            }
            KASSERT(rc == sc->guz_blksz, ("%s: Expected %u bytes, got %zu",
                __func__, sc->guz_blksz, rc));
            return (0);
    }
    
    static void
    guz_zstd_free(struct g_uzip_dapi *zpp)
    {
            struct g_uzip_zstd *sc;
            size_t rc;
    
            sc = to_zstd_softc(zpp);
            rc = ZSTD_freeDCtx(sc->guz_dctx);
            if (ZSTD_isError(rc))
                    printf("%s: UZIP(zstd) free failed: %s\n", __func__,
                        ZSTD_getErrorName(rc));
    
            free(sc, M_GEOM_UZIP);
    }
   
   static int
   guz_zstd_rewind(struct g_uzip_dapi *zpp, const char *gp_name)
   {
           struct g_uzip_zstd *sc;
           size_t rc;
   
           sc = to_zstd_softc(zpp);
           rc = ZSTD_DCtx_reset(sc->guz_dctx, ZSTD_reset_session_and_parameters);
           if (ZSTD_isError(rc)) {
                   printf("%s: UZIP(zstd) rewind failed: %s\n", gp_name,
                       ZSTD_getErrorName(rc));
                   return (EIO);
           }
           return (0);
   }
   
   static void *
   zstd_alloc(void *opaque, size_t size)
   {
           return (malloc(size, opaque, M_WAITOK));
   }
   
   static void
   zstd_free(void *opaque, void *address)
   {
           free(address, opaque);
   }
   
   static const ZSTD_customMem zstd_guz_alloc = {
           .customAlloc = zstd_alloc,
           .customFree = zstd_free,
           .opaque = M_GEOM_UZIP,
   };
   
   struct g_uzip_dapi *
   g_uzip_zstd_ctor(uint32_t blksz)
   {
           struct g_uzip_zstd *sc;
   
           sc = malloc(sizeof(*sc), M_GEOM_UZIP, M_WAITOK | M_ZERO);
   
           sc->guz_dctx = ZSTD_createDCtx_advanced(zstd_guz_alloc);
           if (sc->guz_dctx == NULL) {
                   printf("%s: ZSTD_createDCtx_advanced failed\n", __func__);
                   free(sc, M_GEOM_UZIP);
                   return (NULL);
           }
   
           sc->guz_blksz = blksz;
           sc->guz_pub.max_blen = ZSTD_compressBound(blksz);
           sc->guz_pub.decompress = guz_zstd_decompress;
           sc->guz_pub.free = guz_zstd_free;
           sc->guz_pub.rewind = guz_zstd_rewind;
           sc->guz_pub.pvt = NULL;
   
           return (&sc->guz_pub);
   }

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