cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

zmem.c (2020B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/zlib.h>
      3
      4/* bits taken from ppc */
      5
      6extern void *avail_ram, *end_avail;
      7
      8void exit (void)
      9{
     10  for (;;);
     11}
     12
     13void *zalloc(unsigned size)
     14{
     15        void *p = avail_ram;
     16
     17        size = (size + 7) & -8;
     18        avail_ram += size;
     19        if (avail_ram > end_avail) {
     20                //puts("oops... out of memory\n");
     21                //pause();
     22                exit ();
     23        }
     24        return p;
     25}
     26
     27#define HEAD_CRC        2
     28#define EXTRA_FIELD     4
     29#define ORIG_NAME       8
     30#define COMMENT         0x10
     31#define RESERVED        0xe0
     32
     33#define DEFLATED        8
     34
     35void gunzip (void *dst, int dstlen, unsigned char *src, int *lenp)
     36{
     37	z_stream s;
     38	int r, i, flags;
     39
     40        /* skip header */
     41        i = 10;
     42        flags = src[3];
     43        if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
     44                //puts("bad gzipped data\n");
     45                exit();
     46        }
     47        if ((flags & EXTRA_FIELD) != 0)
     48                i = 12 + src[10] + (src[11] << 8);
     49        if ((flags & ORIG_NAME) != 0)
     50                while (src[i++] != 0)
     51                        ;
     52        if ((flags & COMMENT) != 0)
     53                while (src[i++] != 0)
     54                        ;
     55        if ((flags & HEAD_CRC) != 0)
     56                i += 2;
     57        if (i >= *lenp) {
     58                //puts("gunzip: ran out of data in header\n");
     59                exit();
     60        }
     61
     62	s.workspace = zalloc(zlib_inflate_workspacesize());
     63        r = zlib_inflateInit2(&s, -MAX_WBITS);
     64        if (r != Z_OK) {
     65                //puts("inflateInit2 returned "); puthex(r); puts("\n");
     66                exit();
     67        }
     68        s.next_in = src + i;
     69        s.avail_in = *lenp - i;
     70        s.next_out = dst;
     71        s.avail_out = dstlen;
     72        r = zlib_inflate(&s, Z_FINISH);
     73        if (r != Z_OK && r != Z_STREAM_END) {
     74                //puts("inflate returned "); puthex(r); puts("\n");
     75                exit();
     76        }
     77        *lenp = s.next_out - (unsigned char *) dst;
     78        zlib_inflateEnd(&s);
     79}
     80