static void
_zip_check_torrentzip(struct zip *za, const struct zip_cdir *cdir)
{
uLong crc_got, crc_should;
char buf[8+1];
char *end;
if (za->zp == NULL || cdir == NULL)
return;
if (_zip_string_length(cdir->comment) != TORRENT_SIG_LEN+8
|| strncmp((const char *)cdir->comment->raw, TORRENT_SIG, TORRENT_SIG_LEN) != 0)
return;
memcpy(buf, cdir->comment->raw+TORRENT_SIG_LEN, 8);
buf[8] = '\0';
errno = 0;
crc_should = strtoul(buf, &end, 16);
if ((crc_should == UINT_MAX && errno != 0) || (end && *end))
return;
if (_zip_filerange_crc(za->zp, cdir->offset, cdir->size, &crc_got, NULL) < 0)
return;
if (crc_got == crc_should)
za->flags |= ZIP_AFL_TORRENT;
}
static zip_int64_t
_zip_checkcons(zip_t *za, zip_cdir_t *cd, zip_error_t *error)
{
zip_uint64_t i;
zip_uint64_t min, max, j;
struct zip_dirent temp;
_zip_dirent_init(&temp);
if (cd->nentry) {
max = cd->entry[0].orig->offset;
min = cd->entry[0].orig->offset;
}
else
min = max = 0;
for (i=0; i<cd->nentry; i++) {
if (cd->entry[i].orig->offset < min)
min = cd->entry[i].orig->offset;
if (min > (zip_uint64_t)cd->offset) {
zip_error_set(error, ZIP_ER_NOZIP, 0);
return -1;
}
j = cd->entry[i].orig->offset + cd->entry[i].orig->comp_size
+ _zip_string_length(cd->entry[i].orig->filename) + LENTRYSIZE;
if (j > max)
max = j;
if (max > (zip_uint64_t)cd->offset) {
zip_error_set(error, ZIP_ER_NOZIP, 0);
return -1;
}
if (zip_source_seek(za->src, (zip_int64_t)cd->entry[i].orig->offset, SEEK_SET) < 0) {
_zip_error_set_from_source(error, za->src);
return -1;
}
if (_zip_dirent_read(&temp, za->src, NULL, true, error) == -1) {
_zip_dirent_finalize(&temp);
return -1;
}
if (_zip_headercomp(cd->entry[i].orig, &temp) != 0) {
zip_error_set(error, ZIP_ER_INCONS, 0);
_zip_dirent_finalize(&temp);
return -1;
}
cd->entry[i].orig->extra_fields = _zip_ef_merge(cd->entry[i].orig->extra_fields, temp.extra_fields);
cd->entry[i].orig->local_extra_fields_read = 1;
temp.extra_fields = NULL;
_zip_dirent_finalize(&temp);
}
return (max-min) < ZIP_INT64_MAX ? (zip_int64_t)(max-min) : ZIP_INT64_MAX;
}
static zip_int64_t
_zip_checkcons(FILE *fp, struct zip_cdir *cd, struct zip_error *error)
{
zip_uint64_t i;
zip_uint64_t min, max, j;
struct zip_dirent temp;
if (cd->nentry) {
max = cd->entry[0].orig->offset;
min = cd->entry[0].orig->offset;
}
else
min = max = 0;
for (i=0; i<cd->nentry; i++) {
if (cd->entry[i].orig->offset < min)
min = cd->entry[i].orig->offset;
if (min > (zip_uint64_t)cd->offset) {
_zip_error_set(error, ZIP_ER_NOZIP, 0);
return -1;
}
j = cd->entry[i].orig->offset + cd->entry[i].orig->comp_size
+ _zip_string_length(cd->entry[i].orig->filename) + LENTRYSIZE;
if (j > max)
max = j;
if (max > (zip_uint64_t)cd->offset) {
_zip_error_set(error, ZIP_ER_NOZIP, 0);
return -1;
}
if (fseeko(fp, (off_t)cd->entry[i].orig->offset, SEEK_SET) != 0) {
_zip_error_set(error, ZIP_ER_SEEK, errno);
return -1;
}
if (_zip_dirent_read(&temp, fp, NULL, NULL, 1, error) == -1)
return -1;
if (_zip_headercomp(cd->entry[i].orig, &temp) != 0) {
_zip_error_set(error, ZIP_ER_INCONS, 0);
_zip_dirent_finalize(&temp);
return -1;
}
cd->entry[i].orig->extra_fields = _zip_ef_merge(cd->entry[i].orig->extra_fields, temp.extra_fields);
cd->entry[i].orig->local_extra_fields_read = 1;
temp.extra_fields = NULL;
_zip_dirent_finalize(&temp);
}
return (max-min) < ZIP_INT64_MAX ? (zip_int64_t)(max-min) : ZIP_INT64_MAX;
}
