1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/zlib.h>
4 /* bits taken from ppc */
6 extern void *avail_ram, *end_avail;
7 void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp);
14 static void *zalloc(unsigned int size)
18 size = (size + 7) & -8;
20 if (avail_ram > end_avail) {
21 //puts("oops... out of memory\n");
36 void gunzip (void *dst, int dstlen, unsigned char *src, int *lenp)
44 if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
45 //puts("bad gzipped data\n");
48 if ((flags & EXTRA_FIELD) != 0)
49 i = 12 + src[10] + (src[11] << 8);
50 if ((flags & ORIG_NAME) != 0)
53 if ((flags & COMMENT) != 0)
56 if ((flags & HEAD_CRC) != 0)
59 //puts("gunzip: ran out of data in header\n");
63 s.workspace = zalloc(zlib_inflate_workspacesize());
64 r = zlib_inflateInit2(&s, -MAX_WBITS);
66 //puts("inflateInit2 returned "); puthex(r); puts("\n");
70 s.avail_in = *lenp - i;
73 r = zlib_inflate(&s, Z_FINISH);
74 if (r != Z_OK && r != Z_STREAM_END) {
75 //puts("inflate returned "); puthex(r); puts("\n");
78 *lenp = s.next_out - (unsigned char *) dst;