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35f6a943f7
Separate gunzip in gunzip: Find the end of the header and call zunzip. zunzip: Inflate gunzip block without header. UBI fs blocks can be compresed in lzo, zlib or no-compression. The current implementation of u-boot supported all the compressions but there was a bug in the implementation of the zlib blocks. UBIFS's Zlib blocks do not have header but they were compressed using gunzip, a function used to decompress gunzip files/sectors with a header. This patch adds a new function zunzip that uncompress a zlib block with no header. Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@uam.es>
128 lines
3.1 KiB
C
128 lines
3.1 KiB
C
/*
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* (C) Copyright 2000-2006
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <command.h>
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#include <image.h>
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#include <malloc.h>
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#include <u-boot/zlib.h>
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#define ZALLOC_ALIGNMENT 16
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#define HEAD_CRC 2
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#define EXTRA_FIELD 4
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#define ORIG_NAME 8
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#define COMMENT 0x10
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#define RESERVED 0xe0
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#define DEFLATED 8
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int gunzip(void *, int, unsigned char *, unsigned long *);
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void *zalloc(void *, unsigned, unsigned);
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void zfree(void *, void *, unsigned);
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int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp,
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int stoponerr, int offset);
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void *zalloc(void *x, unsigned items, unsigned size)
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{
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void *p;
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size *= items;
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size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
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p = malloc (size);
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return (p);
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}
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void zfree(void *x, void *addr, unsigned nb)
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{
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free (addr);
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}
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int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
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{
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int i, flags;
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/* skip header */
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i = 10;
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flags = src[3];
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if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
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puts ("Error: Bad gzipped data\n");
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return (-1);
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}
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if ((flags & EXTRA_FIELD) != 0)
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i = 12 + src[10] + (src[11] << 8);
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if ((flags & ORIG_NAME) != 0)
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while (src[i++] != 0)
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;
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if ((flags & COMMENT) != 0)
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while (src[i++] != 0)
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;
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if ((flags & HEAD_CRC) != 0)
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i += 2;
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if (i >= *lenp) {
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puts ("Error: gunzip out of data in header\n");
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return (-1);
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}
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return zunzip(dst, dstlen, src, lenp, 1, i);
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}
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/*
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* Uncompress blocks compressed with zlib without headers
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*/
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int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp,
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int stoponerr, int offset)
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{
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z_stream s;
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int r;
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s.zalloc = zalloc;
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s.zfree = zfree;
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#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
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s.outcb = (cb_func)WATCHDOG_RESET;
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#else
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s.outcb = Z_NULL;
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#endif /* CONFIG_HW_WATCHDOG */
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r = inflateInit2(&s, -MAX_WBITS);
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if (r != Z_OK) {
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printf ("Error: inflateInit2() returned %d\n", r);
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return -1;
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}
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s.next_in = src + offset;
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s.avail_in = *lenp - offset;
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s.next_out = dst;
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s.avail_out = dstlen;
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r = inflate(&s, Z_FINISH);
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if ((r != Z_STREAM_END) && (stoponerr==1)) {
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printf ("Error: inflate() returned %d\n", r);
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inflateEnd(&s);
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return (-1);
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}
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*lenp = s.next_out - (unsigned char *) dst;
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inflateEnd(&s);
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return 0;
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}
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