88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
#include "zlib.h"
|
|
|
|
/* bits taken from ppc */
|
|
|
|
extern void *avail_ram, *end_avail;
|
|
|
|
void exit (void)
|
|
{
|
|
for (;;);
|
|
}
|
|
|
|
void *zalloc(void *x, unsigned items, unsigned size)
|
|
{
|
|
void *p = avail_ram;
|
|
|
|
size *= items;
|
|
size = (size + 7) & -8;
|
|
avail_ram += size;
|
|
if (avail_ram > end_avail) {
|
|
//puts("oops... out of memory\n");
|
|
//pause();
|
|
exit ();
|
|
}
|
|
return p;
|
|
}
|
|
|
|
void zfree(void *x, void *addr, unsigned nb)
|
|
{
|
|
}
|
|
|
|
|
|
#define HEAD_CRC 2
|
|
#define EXTRA_FIELD 4
|
|
#define ORIG_NAME 8
|
|
#define COMMENT 0x10
|
|
#define RESERVED 0xe0
|
|
|
|
#define DEFLATED 8
|
|
|
|
void gunzip (void *dst, int dstlen, unsigned char *src, int *lenp)
|
|
{
|
|
z_stream s;
|
|
int r, i, flags;
|
|
|
|
/* skip header */
|
|
|
|
i = 10;
|
|
flags = src[3];
|
|
if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
|
|
//puts("bad gzipped data\n");
|
|
exit();
|
|
}
|
|
if ((flags & EXTRA_FIELD) != 0)
|
|
i = 12 + src[10] + (src[11] << 8);
|
|
if ((flags & ORIG_NAME) != 0)
|
|
while (src[i++] != 0)
|
|
;
|
|
if ((flags & COMMENT) != 0)
|
|
while (src[i++] != 0)
|
|
;
|
|
if ((flags & HEAD_CRC) != 0)
|
|
i += 2;
|
|
if (i >= *lenp) {
|
|
//puts("gunzip: ran out of data in header\n");
|
|
exit();
|
|
}
|
|
|
|
s.zalloc = zalloc;
|
|
s.zfree = zfree;
|
|
r = inflateInit2(&s, -MAX_WBITS);
|
|
if (r != Z_OK) {
|
|
//puts("inflateInit2 returned "); puthex(r); puts("\n");
|
|
exit();
|
|
}
|
|
s.next_in = src + i;
|
|
s.avail_in = *lenp - i;
|
|
s.next_out = dst;
|
|
s.avail_out = dstlen;
|
|
r = inflate(&s, Z_FINISH);
|
|
if (r != Z_OK && r != Z_STREAM_END) {
|
|
//puts("inflate returned "); puthex(r); puts("\n");
|
|
exit();
|
|
}
|
|
*lenp = s.next_out - (unsigned char *) dst;
|
|
inflateEnd(&s);
|
|
}
|
|
|