usr.bin/vndcompress/vndcompress.h

   1 /* $Id: vndcompress.h,v 1.2 2008/02/18 03:34:04 dyoung Exp $ */
   2
   3 /*
   4  * Copyright (c) 2005 by Florian Stoehr
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *        This product includes software developed by Florian Stoehr
  18  * 4. The name of Florian Stoehr may not be used to endorse or promote
  19  *    products derived from this software without specific prior written
  20  *    permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY FLORIAN STOEHR ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35  /*
  36   * cloop2: File format
  37   *
  38   * All numbers are in network byte order!
  39   *
  40   * Offset  Size Description
  41   * 0       128  Preamble (actually Linux load instructions)
  42   * 128     4    Block size
  43   * 131     4    Number of blocks
  44   * 135     8*x  64-bit compressed block start offsets (rel. to FILE (!))
  45   * 135+8*x y    Compressed blocks
  46   */
  47 #ifndef __CLCONFIG_H__
  48 #define __CLCONFIG_H__
  49
  50 #include <machine/bswap.h>
  51
  52 struct cloop_header;
  53
  54 void usage(void);
  55 void vndcompress(const char *, const char *, uint32_t);
  56 uint64_t * readheader(int, struct cloop_header *, off_t *);
  57 void vnduncompress(const char *, const char *);
  58
  59 /* Size of the shell command (Linux compatibility) */
  60 #define CLOOP_SH_SIZE 128
  61
  62 /* Atomic BSD block is always 512 bytes */
  63 #define ATOMBLOCK 512
  64
  65 /* The default blocksize (compressed chunk) is 64 KB */
  66 #define DEF_BLOCKSIZE 128*ATOMBLOCK
  67
  68 /*
  69  * SWAPPER: Convert a 64-bit value between network and local byte order
  70  * SWAPPER32: Convert a 32-bit value between network and local byte order
  71  */
  72 #if (_BYTE_ORDER == _BIG_ENDIAN)
  73 #define SWAPPER(arg) (arg)
  74 #define SWAPPER32(arg) (arg)
  75 #define SWAPPER16(arg) (arg)
  76 #else
  77 #define SWAPPER(arg) bswap64(arg)
  78 #define SWAPPER32(arg) bswap32(arg)
  79 #define SWAPPER16(arg) bswap16(arg)
  80 #endif
  81
  82 struct cloop_header {
  83         char sh[CLOOP_SH_SIZE];
  84         uint32_t block_size;
  85         uint32_t num_blocks;
  86 };
  87
  88 #endif