io: fix some memory leaks

src/apk_io.h

@@ -43,7 +43,7 @@ struct apk_ostream {
 	void (*close)(void *stream);
 };
 
-struct apk_istream *apk_bstream_gunzip(struct apk_bstream *);
+struct apk_istream *apk_bstream_gunzip(struct apk_bstream *, int);
 struct apk_ostream *apk_ostream_gzip(struct apk_ostream *);
 
 struct apk_istream *apk_istream_from_fd(int fd);

src/archive.c

@@ -179,7 +179,14 @@ int apk_parse_tar(struct apk_istream *is, apk_archive_entry_parser parser,
 int apk_parse_tar_gz(struct apk_bstream *bs, apk_archive_entry_parser parser,
 		     void *ctx)
 {
-	return apk_parse_tar(apk_bstream_gunzip(bs), parser, ctx);
+	struct apk_istream *is;
+	int rc;
+
+	is = apk_bstream_gunzip(bs, FALSE);
+	rc = apk_parse_tar(is, parser, ctx);
+	is->close(is);
+
+	return rc;
 }
 
 int apk_archive_entry_extract(const struct apk_file_info *ae,

src/gunzip.c

@@ -22,6 +22,7 @@ struct apk_gzip_istream {
 	struct apk_bstream *bs;
 	z_stream zs;
 	int z_err;
+	int autoclose;
 };
 
 static size_t gz_read(void *stream, void *ptr, size_t size)
@@ -64,10 +65,12 @@ static void gz_close(void *stream)
 		container_of(stream, struct apk_gzip_istream, is);
 
 	inflateEnd(&gis->zs);
+	if (gis->autoclose)
+		gis->bs->close(gis->bs, NULL, NULL);
 	free(gis);
 }
 
-struct apk_istream *apk_bstream_gunzip(struct apk_bstream *bs)
+struct apk_istream *apk_bstream_gunzip(struct apk_bstream *bs, int autoclose)
 {
 	struct apk_gzip_istream *gis;
 
@@ -83,6 +86,7 @@ struct apk_istream *apk_bstream_gunzip(struct apk_bstream *bs)
 		.is.close = gz_close,
 		.bs = bs,
 		.z_err = 0,
+		.autoclose = autoclose,
 	};
 
 	if (inflateInit2(&gis->zs, 15+32) != Z_OK) {

src/io.c

@@ -389,7 +389,7 @@ int apk_file_get_info(const char *filename, struct apk_file_info *fi)
 
 struct apk_istream *apk_istream_from_file_gz(const char *file)
 {
-	return apk_bstream_gunzip(apk_bstream_from_file(file));
+	return apk_bstream_gunzip(apk_bstream_from_file(file), TRUE);
 }
 
 struct apk_fd_ostream {