LXR uboot/lib/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 <u-boot/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
  39void *zalloc(void *, unsigned, unsigned);
  40void zfree(void *, void *, unsigned);
  41
  42void *zalloc(void *x, unsigned items, unsigned size)
  43{
  44        void *p;
  45
  46        size *= items;
  47        size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
  48
  49        p = malloc (size);
  50
  51        return (p);
  52}
  53
  54void zfree(void *x, void *addr, unsigned nb)
  55{
  56        free (addr);
  57}
  58
  59int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
  60{
  61        int i, flags;
  62
  63        /* skip header */
  64        i = 10;
  65        flags = src[3];
  66        if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
  67                puts ("Error: Bad gzipped data\n");
  68                return (-1);
  69        }
  70        if ((flags & EXTRA_FIELD) != 0)
  71                i = 12 + src[10] + (src[11] << 8);
  72        if ((flags & ORIG_NAME) != 0)
  73                while (src[i++] != 0)
  74                        ;
  75        if ((flags & COMMENT) != 0)
  76                while (src[i++] != 0)
  77                        ;
  78        if ((flags & HEAD_CRC) != 0)
  79                i += 2;
  80        if (i >= *lenp) {
  81                puts ("Error: gunzip out of data in header\n");
  82                return (-1);
  83        }
  84
  85        return zunzip(dst, dstlen, src, lenp, 1, i);
  86}
  87
  88/*
  89 * Uncompress blocks compressed with zlib without headers
  90 */
  91int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp,
  92                                                int stoponerr, int offset)
  93{
  94        z_stream s;
  95        int r;
  96
  97        s.zalloc = zalloc;
  98        s.zfree = zfree;
  99
 100        r = inflateInit2(&s, -MAX_WBITS);
 101        if (r != Z_OK) {
 102                printf ("Error: inflateInit2() returned %d\n", r);
 103                return -1;
 104        }
 105        s.next_in = src + offset;
 106        s.avail_in = *lenp - offset;
 107        s.next_out = dst;
 108        s.avail_out = dstlen;
 109        r = inflate(&s, Z_FINISH);
 110        if ((r != Z_STREAM_END) && (stoponerr==1)) {
 111                printf ("Error: inflate() returned %d\n", r);
 112                inflateEnd(&s);
 113                return (-1);
 114        }
 115        *lenp = s.next_out - (unsigned char *) dst;
 116        inflateEnd(&s);
 117
 118        return 0;
 119}
 120