blob: 74f0bf9f3e1d042a93c877be418961ebfc40bb61 [file] [log] [blame]
Marian Balakowicz321359f2008-01-08 18:11:43 +01001/*
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
39int gunzip(void *, int, unsigned char *, unsigned long *);
40void *zalloc(void *, unsigned, unsigned);
41void zfree(void *, void *, unsigned);
42
43void *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
55void zfree(void *x, void *addr, unsigned nb)
56{
57 free (addr);
58}
59
60int 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}