]> git.ipfire.org Git - people/ms/u-boot.git/blob - lib/gunzip.c
NAND: add NAND_CMD_PARAM (0xec) definition
[people/ms/u-boot.git] / 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
39 void *zalloc(void *, unsigned, unsigned);
40 void zfree(void *, void *, unsigned);
41
42 void *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
54 void zfree(void *x, void *addr, unsigned nb)
55 {
56 free (addr);
57 }
58
59 int 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 */
91 int 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 }