configurable zip compression

Have zip format honor compression-level.

diff --git a/libarchive/archive_write_set_format_zip.c b/libarchive/archive_write_set_format_zip.c
index 332611c86bcf1f72690e08bdedcb5329b3fadb43..c161c738e830fb8bf8fb56e682e8c16b8a44f6b6 100644 (file)
--- a/libarchive/archive_write_set_format_zip.c
+++ b/libarchive/archive_write_set_format_zip.c
@@ -223,6 +223,23 @@ archive_write_zip_options(struct archive_write *a, const char *key,
                        ret = ARCHIVE_OK;
                }
                return (ret);
+       } else if (strcmp(key, "compression-level") == 0) {
+               if (val == NULL || !(val[0] >= '0' && val[0] <= '9') || val[1] != '\0') {
+                       return ARCHIVE_WARN;
+               }
+
+               if (val[0] == '0') {
+                       zip->requested_compression = COMPRESSION_STORE;
+                       return ARCHIVE_OK;
+               }
+
+#ifdef HAVE_ZLIB_H
+               zip->requested_compression = val[0] - '0';
+               return ARCHIVE_OK;
+#else
+               archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
+                   "deflate compression not supported");
+#endif
        } else if (strcmp(key, "experimental") == 0) {
                if (val == NULL || val[0] == 0) {
                        zip->flags &= ~ ZIP_FLAG_EXPERIMENT_xl;