common/gunzip.c

   1 /*
   2  * (C) Copyright 2000-2006
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <watchdog.h>
  26 #include <command.h>
  27 #include <image.h>
  28 #include <malloc.h>
  29 #include <zlib.h>
  30
  31 #define ZALLOC_ALIGNMENT        16
  32 #define HEAD_CRC                2
  33 #define EXTRA_FIELD             4
  34 #define ORIG_NAME               8
  35 #define COMMENT                 0x10
  36 #define RESERVED                0xe0
  37 #define DEFLATED                8
  38
  39 int gunzip(void *, int, unsigned char *, unsigned long *);
  40 void *zalloc(void *, unsigned, unsigned);
  41 void zfree(void *, void *, unsigned);
  42
  43 void *zalloc(void *x, unsigned items, unsigned size)
  44 {
  45         void *p;
  46
  47         size *= items;
  48         size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
  49
  50         p = malloc (size);
  51
  52         return (p);
  53 }
  54
  55 void zfree(void *x, void *addr, unsigned nb)
  56 {
  57         free (addr);
  58 }
  59
  60 int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
  61 {
  62         z_stream s;
  63         int r, i, flags;
  64
  65         /* skip header */
  66         i = 10;
  67         flags = src[3];
  68         if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
  69                 puts ("Error: Bad gzipped data\n");
  70                 return (-1);
  71         }
  72         if ((flags & EXTRA_FIELD) != 0)
  73                 i = 12 + src[10] + (src[11] << 8);
  74         if ((flags & ORIG_NAME) != 0)
  75                 while (src[i++] != 0)
  76                         ;
  77         if ((flags & COMMENT) != 0)
  78                 while (src[i++] != 0)
  79                         ;
  80         if ((flags & HEAD_CRC) != 0)
  81                 i += 2;
  82         if (i >= *lenp) {
  83                 puts ("Error: gunzip out of data in header\n");
  84                 return (-1);
  85         }
  86
  87         s.zalloc = zalloc;
  88         s.zfree = zfree;
  89 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
  90         s.outcb = (cb_func)WATCHDOG_RESET;
  91 #else
  92         s.outcb = Z_NULL;
  93 #endif  /* CONFIG_HW_WATCHDOG */
  94
  95         r = inflateInit2(&s, -MAX_WBITS);
  96         if (r != Z_OK) {
  97                 printf ("Error: inflateInit2() returned %d\n", r);
  98                 return (-1);
  99         }
 100         s.next_in = src + i;
 101         s.avail_in = *lenp - i;
 102         s.next_out = dst;
 103         s.avail_out = dstlen;
 104         r = inflate(&s, Z_FINISH);
 105         if (r != Z_OK && r != Z_STREAM_END) {
 106                 printf ("Error: inflate() returned %d\n", r);
 107                 return (-1);
 108         }
 109         *lenp = s.next_out - (unsigned char *) dst;
 110         inflateEnd(&s);
 111
 112         return (0);
 113 }