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 do { 110 r = inflate(&s, Z_FINISH); 111 if (r != Z_STREAM_END && r != Z_BUF_ERROR && stoponerr == 1) { 112 printf("Error: inflate() returned %d\n", r); 113 inflateEnd(&s); 114 return -1; 115 } 116 s.avail_in = *lenp - offset - (int)(s.next_out - (unsigned char*)dst); 117 s.avail_out = dstlen; 118 } while (r == Z_BUF_ERROR); 119 *lenp = s.next_out - (unsigned char *) dst; 120 inflateEnd(&s); 121 122 return 0; 123 } 124