lib/bpf/zip.c

41 	/* Number of the file containing this structure or 0xFFFF if ZIP64 archive.
42 	 * Zip archive might span multiple files (disks).
47 	 * 0xFFFF if ZIP64 archive.
52 	 * archive.
57 	 * archive.
61 	/* Size of the central directory record or 0xFFFFFFFF if ZIP64 archive. */
64 	/* Offset of the central directory from the beginning of the archive or
65 	 * 0xFFFFFFFF if ZIP64 archive.
97 	/* Number of the disk where the file starts or 0xFFFF if ZIP64 archive. */
135 static void *check_access(struct zip_archive *archive, __u32 offset, __u32 size)
137 	if (offset + size > archive->size || offset > offset + size)
140 	return archive->data + offset;
144  * archive uses features which are not supported.
146 static int try_parse_end_of_cd(struct zip_archive *archive, __u32 offset)
152 	eocd = check_access(archive, offset, sizeof(*eocd));
157 	if (offset + sizeof(*eocd) + comment_length != archive->size)
167 	if (!check_access(archive, cd_offset, cd_size))
170 	archive->cd_offset = cd_offset;
171 	archive->cd_records = cd_records;
175 static int find_cd(struct zip_archive *archive)
180 	if (archive->size <= sizeof(struct end_of_cd_record))
187 	offset = archive->size - sizeof(struct end_of_cd_record);
191 		rc = try_parse_end_of_cd(archive, offset);
200 	struct zip_archive *archive;
222 	archive = malloc(sizeof(*archive));
223 	if (!archive) {
228 	archive->data = data;
229 	archive->size = size;
231 	err = find_cd(archive);
234 		free(archive);
238 	return archive;
241 void zip_archive_close(struct zip_archive *archive)
243 	munmap(archive->data, archive->size);
244 	free(archive);
247 static struct local_file_header *local_file_header_at_offset(struct zip_archive *archive,
252 	lfh = check_access(archive, offset, sizeof(*lfh));
259 static int get_entry_at_offset(struct zip_archive *archive, __u32 offset, struct zip_entry *out)
266 	lfh = local_file_header_at_offset(archive, offset);
274 	name = check_access(archive, offset, lfh->file_name_length);
279 	if (!check_access(archive, offset, lfh->extra_field_length))
284 	data = check_access(archive, offset, compressed_size);
298 int zip_archive_find_entry(struct zip_archive *archive, const char *file_name,
302 	__u32 i, offset = archive->cd_offset;
304 	for (i = 0; i < archive->cd_records; ++i) {
309 		cdfh = check_access(archive, offset, sizeof(*cdfh));
315 		cdfh_name = check_access(archive, offset, cdfh_name_length);
323 		    memcmp(file_name, archive->data + offset, file_name_length) == 0) {
324 			return get_entry_at_offset(archive, cdfh->offset, out);