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lib_generic: gunzip: New function zunzip

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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>
This commit is contained in:
Ricardo Ribalda Delgado 2009-04-27 18:33:32 +02:00 committed by Wolfgang Denk
parent ccb71dfac9
commit 35f6a943f7
1 changed files with 20 additions and 7 deletions
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27
lib_generic/gunzip.c
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@ -39,6 +39,8 @@
int gunzip(void *, int, unsigned char *, unsigned long *);
void *zalloc(void *, unsigned, unsigned);
void zfree(void *, void *, unsigned);
int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp,
int stoponerr, int offset);
void *zalloc(void *x, unsigned items, unsigned size)
{
@ -59,8 +61,7 @@ void zfree(void *x, void *addr, unsigned nb)
int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
{
z_stream s;
int r, i, flags;
int i, flags;
/* skip header */
i = 10;
@ -84,6 +85,18 @@ int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
return (-1);
}
return zunzip(dst, dstlen, src, lenp, 1, i);
}
/*
* Uncompress blocks compressed with zlib without headers
*/
int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp,
int stoponerr, int offset)
{
z_stream s;
int r;
s.zalloc = zalloc;
s.zfree = zfree;
#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
@ -95,14 +108,14 @@ int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
r = inflateInit2(&s, -MAX_WBITS);
if (r != Z_OK) {
printf ("Error: inflateInit2() returned %d\n", r);
return (-1);
return -1;
}
s.next_in = src + i;
s.avail_in = *lenp - i;
s.next_in = src + offset;
s.avail_in = *lenp - offset;
s.next_out = dst;
s.avail_out = dstlen;
r = inflate(&s, Z_FINISH);
if (r != Z_STREAM_END) {
if ((r != Z_STREAM_END) && (stoponerr==1)) {
printf ("Error: inflate() returned %d\n", r);
inflateEnd(&s);
return (-1);
@ -110,5 +123,5 @@ int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
*lenp = s.next_out - (unsigned char *) dst;
inflateEnd(&s);
return (0);
return 0;
}