FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/os/freebsd/spl/spl_zlib.c

     /*
      * Copyright (c) 2020 iXsystems, Inc.
      * All rights reserved.
      *
      * 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 AUTHORS 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 AUTHORS 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/types.h>
    #include <sys/kmem.h>
    #include <sys/kmem_cache.h>
    #include <sys/zmod.h>
    #if __FreeBSD_version >= 1300041
    #include <contrib/zlib/zlib.h>
    #else
    #include <sys/zlib.h>
    #endif
    #include <sys/kobj.h>
    
    
    static void *
    zcalloc(void *opaque, uint_t items, uint_t size)
    {
            (void) opaque;
            return (malloc((size_t)items*size, M_SOLARIS, M_NOWAIT));
    }
    
    static void
    zcfree(void *opaque, void *ptr)
    {
            (void) opaque;
            free(ptr, M_SOLARIS);
    }
    
    static int
    zlib_deflateInit(z_stream *stream, int level)
    {
    
            stream->zalloc = zcalloc;
            stream->opaque = NULL;
            stream->zfree = zcfree;
    
            return (deflateInit(stream, level));
    }
    
    static int
    zlib_deflate(z_stream *stream, int flush)
    {
            return (deflate(stream, flush));
    }
    
    static int
    zlib_deflateEnd(z_stream *stream)
    {
            return (deflateEnd(stream));
    }
    
    static int
    zlib_inflateInit(z_stream *stream)
    {
            stream->zalloc = zcalloc;
            stream->opaque = NULL;
            stream->zfree = zcfree;
    
            return (inflateInit(stream));
    }
    
    static int
    zlib_inflate(z_stream *stream, int finish)
    {
    #if __FreeBSD_version >= 1300024
            return (inflate(stream, finish));
    #else
            return (_zlib104_inflate(stream, finish));
    #endif
    }
    
   
   static int
   zlib_inflateEnd(z_stream *stream)
   {
           return (inflateEnd(stream));
   }
   
   /*
    * A kmem_cache is used for the zlib workspaces to avoid having to vmalloc
    * and vfree for every call.  Using a kmem_cache also has the advantage
    * that improves the odds that the memory used will be local to this cpu.
    * To further improve things it might be wise to create a dedicated per-cpu
    * workspace for use.  This would take some additional care because we then
    * must disable preemption around the critical section, and verify that
    * zlib_deflate* and zlib_inflate* never internally call schedule().
    */
   static void *
   zlib_workspace_alloc(int flags)
   {
           // return (kmem_cache_alloc(zlib_workspace_cache, flags));
           return (NULL);
   }
   
   static void
   zlib_workspace_free(void *workspace)
   {
           // kmem_cache_free(zlib_workspace_cache, workspace);
   }
   
   /*
    * Compresses the source buffer into the destination buffer. The level
    * parameter has the same meaning as in deflateInit.  sourceLen is the byte
    * length of the source buffer. Upon entry, destLen is the total size of the
    * destination buffer, which must be at least 0.1% larger than sourceLen plus
    * 12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
    *
    * compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
    * memory, Z_BUF_ERROR if there was not enough room in the output buffer,
    * Z_STREAM_ERROR if the level parameter is invalid.
    */
   int
   z_compress_level(void *dest, size_t *destLen, const void *source,
       size_t sourceLen, int level)
   {
           z_stream stream = {0};
           int err;
   
           stream.next_in = (Byte *)source;
           stream.avail_in = (uInt)sourceLen;
           stream.next_out = dest;
           stream.avail_out = (uInt)*destLen;
           stream.opaque = NULL;
   
           if ((size_t)stream.avail_out != *destLen)
                   return (Z_BUF_ERROR);
   
           stream.opaque = zlib_workspace_alloc(KM_SLEEP);
   #if 0
           if (!stream.opaque)
                   return (Z_MEM_ERROR);
   #endif
           err = zlib_deflateInit(&stream, level);
           if (err != Z_OK) {
                   zlib_workspace_free(stream.opaque);
                   return (err);
           }
   
           err = zlib_deflate(&stream, Z_FINISH);
           if (err != Z_STREAM_END) {
                   zlib_deflateEnd(&stream);
                   zlib_workspace_free(stream.opaque);
                   return (err == Z_OK ? Z_BUF_ERROR : err);
           }
           *destLen = stream.total_out;
   
           err = zlib_deflateEnd(&stream);
           zlib_workspace_free(stream.opaque);
           return (err);
   }
   
   /*
    * Decompresses the source buffer into the destination buffer.  sourceLen is
    * the byte length of the source buffer. Upon entry, destLen is the total
    * size of the destination buffer, which must be large enough to hold the
    * entire uncompressed data. (The size of the uncompressed data must have
    * been saved previously by the compressor and transmitted to the decompressor
    * by some mechanism outside the scope of this compression library.)
    * Upon exit, destLen is the actual size of the compressed buffer.
    * This function can be used to decompress a whole file at once if the
    * input file is mmap'ed.
    *
    * uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
    * enough memory, Z_BUF_ERROR if there was not enough room in the output
    * buffer, or Z_DATA_ERROR if the input data was corrupted.
    */
   int
   z_uncompress(void *dest, size_t *destLen, const void *source, size_t sourceLen)
   {
           z_stream stream = {0};
           int err;
   
           stream.next_in = (Byte *)source;
           stream.avail_in = (uInt)sourceLen;
           stream.next_out = dest;
           stream.avail_out = (uInt)*destLen;
   
           if ((size_t)stream.avail_out != *destLen)
                   return (Z_BUF_ERROR);
   
           stream.opaque = zlib_workspace_alloc(KM_SLEEP);
   #if 0
           if (!stream.opaque)
                   return (Z_MEM_ERROR);
   #endif
           err = zlib_inflateInit(&stream);
           if (err != Z_OK) {
                   zlib_workspace_free(stream.opaque);
                   return (err);
           }
   
           err = zlib_inflate(&stream, Z_FINISH);
           if (err != Z_STREAM_END) {
                   zlib_inflateEnd(&stream);
                   zlib_workspace_free(stream.opaque);
   
                   if (err == Z_NEED_DICT ||
                       (err == Z_BUF_ERROR && stream.avail_in == 0))
                           return (Z_DATA_ERROR);
   
                   return (err);
           }
           *destLen = stream.total_out;
   
           err = zlib_inflateEnd(&stream);
           zlib_workspace_free(stream.opaque);
   
           return (err);
   }

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