diff --git a/src/apk_database.h b/src/apk_database.h
index 4cf8b14..0edf4f2 100644
--- a/src/apk_database.h
+++ b/src/apk_database.h
@@ -140,6 +140,7 @@ struct apk_package *apk_db_get_pkg(struct apk_database *db, struct apk_checksum
 struct apk_package *apk_db_get_file_owner(struct apk_database *db, apk_blob_t filename);
 
 int apk_db_index_read(struct apk_database *db, struct apk_bstream *bs, int repo);
+int apk_db_index_read_file(struct apk_database *db, const char *file, int repo);
 int apk_db_index_write(struct apk_database *db, struct apk_ostream *os);
 
 int apk_db_add_repository(apk_database_t db, apk_blob_t repository);
diff --git a/src/database.c b/src/database.c
index d5f83e6..b9eef79 100644
--- a/src/database.c
+++ b/src/database.c
@@ -1152,6 +1152,40 @@ static int load_apkindex(void *sctx, const struct apk_file_info *fi,
 	return 0;
 }
 
+static int load_index(struct apk_database *db, struct apk_bstream *bs,
+		      int targz, int repo)
+{
+	if (targz) {
+		struct apk_istream *is;
+		struct apkindex_ctx ctx;
+
+		ctx.db = db;
+		ctx.repo = repo;
+		apk_sign_ctx_init(&ctx.sctx, APK_SIGN_VERIFY, NULL);
+		is = apk_bstream_gunzip_mpart(bs, apk_sign_ctx_mpart_cb, &ctx.sctx);
+		apk_tar_parse(is, load_apkindex, &ctx);
+		is->close(is);
+		apk_sign_ctx_free(&ctx.sctx);
+		if (!ctx.sctx.data_verified)
+			return -1;
+	} else {
+		bs = apk_bstream_from_istream(apk_bstream_gunzip(bs));
+		apk_db_index_read(db, bs, repo);
+		bs->close(bs, NULL);
+	}
+	return 0;
+}
+
+int apk_db_index_read_file(struct apk_database *db, const char *file, int repo)
+{
+	int targz = 1;
+
+	if (strstr(file, ".tar.gz") == NULL && strstr(file, ".gz") != NULL)
+		targz = 0;
+
+	return load_index(db, apk_bstream_from_file(file), targz, repo);
+}
+
 int apk_db_add_repository(apk_database_t _db, apk_blob_t repository)
 {
 	struct apk_database *db = _db.db;
@@ -1195,28 +1229,11 @@ int apk_db_add_repository(apk_database_t _db, apk_blob_t repository)
 		apk_warning("Failed to open index for %s", repo->url);
 		return -1;
 	}
-	if (targz) {
-		struct apk_istream *is;
-		struct apkindex_ctx ctx;
 
-		ctx.db = db;
-		ctx.repo = r;
-		apk_sign_ctx_init(&ctx.sctx, APK_SIGN_VERIFY, NULL);
-		is = apk_bstream_gunzip_mpart(bs, apk_sign_ctx_mpart_cb, &ctx.sctx);
-		r = apk_tar_parse(is, load_apkindex, &ctx);
-		is->close(is);
-		apk_sign_ctx_free(&ctx.sctx);
-		if (!ctx.sctx.data_verified) {
-			apk_error("Bad repository signature: %s", repo->url);
-			return -1;
-		}
-	} else {
-		bs = apk_bstream_from_istream(apk_bstream_gunzip(bs));
-		apk_db_index_read(db, bs, r);
-		bs->close(bs, NULL);
-	}
-
-	return 0;
+	r = load_index(db, bs, targz, r);
+	if (r != 0)
+		apk_error("%s: Bad repository signature", repo->url);
+	return r;
 }
 
 static void extract_cb(void *_ctx, size_t progress)
diff --git a/src/index.c b/src/index.c
index 2a7365e..608dea8 100644
--- a/src/index.c
+++ b/src/index.c
@@ -51,20 +51,15 @@ static int index_parse(void *ctx, int optch, int optindex, const char *optarg)
 
 static int index_read_file(struct apk_database *db, struct index_ctx *ictx)
 {
-	struct apk_bstream *bs;
 	struct apk_file_info fi;
-	int r;
+
 	if (ictx->index == NULL)
 		return 0;
 	if (apk_file_get_info(ictx->index, APK_CHECKSUM_NONE, &fi) < 0)
 		return -1;
 	ictx->index_mtime = fi.mtime;
-	bs = apk_bstream_from_istream(apk_bstream_gunzip(apk_bstream_from_url(ictx->index)));
-	if (bs == NULL)
-		return -1;
-	r = apk_db_index_read(db, bs, 0);
-	bs->close(bs, NULL);
-	return r;
+
+	return apk_db_index_read_file(db, ictx->index, 0);
 }
 
 static int warn_if_no_providers(apk_hash_item item, void *ctx)