static int nsis_headers(struct nsis_st *n, cli_ctx *ctx) {
char buf[28];
struct stat st;
uint32_t pos;
int i;
uint8_t comps[] = {0, 0, 0, 0}, trunc = 0;
if (fstat(n->ifd, &st)==-1 ||
lseek(n->ifd, n->off, SEEK_SET)==-1 ||
cli_readn(n->ifd, buf, 28) != 28)
return CL_EIO;
n->hsz = (uint32_t)cli_readint32(buf+0x14);
n->asz = (uint32_t)cli_readint32(buf+0x18);
cli_dbgmsg("NSIS: Header info - Flags=%x, Header size=%x, Archive size=%x\n", cli_readint32(buf), n->hsz, n->asz);
if (st.st_size - n->off < (off_t) n->asz) {
cli_dbgmsg("NSIS: Possibly truncated file\n");
n->asz = st.st_size - n->off;
trunc++;
} else if (st.st_size - n->off != (off_t) n->asz) {
cli_dbgmsg("NSIS: Overlays found\n");
}
n->asz -= 0x1c;
/* Guess if solid */
for (i=0, pos=0;pos < n->asz-4;i++) {
int32_t nextsz;
if (cli_readn(n->ifd, buf+4, 4)!=4) return CL_EIO;
nextsz=cli_readint32(buf+4);
if (!i) n->comp = nsis_detcomp(buf+4);
if (nextsz&0x80000000) {
nextsz&=~0x80000000;
if (cli_readn(n->ifd, buf+4, 4)!=4) return CL_EIO;
comps[nsis_detcomp(buf+4)]++;
nextsz-=4;
pos+=4;
}
if ((pos+=4+nextsz) > n->asz) {
n->solid = 1;
break;
}
if (lseek(n->ifd, nextsz, SEEK_CUR)==-1) return CL_EIO;
}
if (trunc && i>=2) n->solid=0;
cli_dbgmsg("NSIS: solid compression%s detected\n", (n->solid)?"":" not");
/* Guess the compression method */
if (!n->solid) {
cli_dbgmsg("NSIS: bzip2 %u - lzma %u - zlib %u\n", comps[1], comps[2], comps[3]);
n->comp = (comps[1]<comps[2]) ? (comps[2]<comps[3] ? COMP_ZLIB : COMP_LZMA) : (comps[1]<comps[3] ? COMP_ZLIB : COMP_BZIP2);
}
if (lseek(n->ifd, n->off+0x1c, SEEK_SET)==-1) return CL_EIO;
return nsis_unpack_next(n, ctx);
}
static int cli_nsis_unpack(struct nsis_st *n, cli_ctx *ctx) {
return (n->fno) ? nsis_unpack_next(n, ctx) : nsis_headers(n, ctx);
}
static int nsis_headers(struct nsis_st *n, cli_ctx *ctx) {
const char *buf;
uint32_t pos;
int i;
uint8_t comps[] = {0, 0, 0, 0}, trunc = 0;
if (!(buf = fmap_need_off_once(n->map, n->off, 0x1c)))
return CL_EREAD;
n->hsz = (uint32_t)cli_readint32(buf+0x14);
n->asz = (uint32_t)cli_readint32(buf+0x18);
n->fullsz = n->map->len;
cli_dbgmsg("NSIS: Header info - Flags=%x, Header size=%x, Archive size=%x\n", cli_readint32(buf), n->hsz, n->asz);
if (n->fullsz - n->off < (off_t) n->asz) {
cli_dbgmsg("NSIS: Possibly truncated file\n");
n->asz = n->fullsz - n->off;
trunc++;
} else if (n->fullsz - n->off != (off_t) n->asz) {
cli_dbgmsg("NSIS: Overlays found\n");
}
n->asz -= 0x1c;
buf += 0x1c;
/* Guess if solid */
for (i=0, pos=0;pos < n->asz-4;i++) {
int32_t nextsz;
if (!(buf = fmap_need_ptr_once(n->map, (void *)buf, 4))) return CL_EREAD;
nextsz=cli_readint32(buf);
if (!i) n->comp = nsis_detcomp(buf);
buf += 4;
if (nextsz&0x80000000) {
nextsz&=~0x80000000;
if (!(buf = fmap_need_ptr_once(n->map, (void *)buf, 4))) return CL_EREAD;
comps[nsis_detcomp(buf)]++;
nextsz-=4;
pos+=4;
buf+=4;
}
if ((pos+=4+nextsz) > n->asz) {
n->solid = 1;
break;
}
buf += nextsz;
}
if (trunc && i>=2) n->solid=0;
cli_dbgmsg("NSIS: solid compression%s detected\n", (n->solid)?"":" not");
/* Guess the compression method */
if (!n->solid) {
cli_dbgmsg("NSIS: bzip2 %u - lzma %u - zlib %u\n", comps[1], comps[2], comps[3]);
n->comp = (comps[1]<comps[2]) ? (comps[2]<comps[3] ? COMP_ZLIB : COMP_LZMA) : (comps[1]<comps[3] ? COMP_ZLIB : COMP_BZIP2);
}
n->curpos = n->off+0x1c;
return nsis_unpack_next(n, ctx);
}
