From: Tim Kientzle <kientzle@acm.org>
Date: Sat, 13 Sep 2025 18:17:38 +0000 (-0700)
Subject: Only set the filename-present bit if we actually write the filename
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e5c2eb783b1582534dfbf064265393527a71ec97;p=thirdparty%2Flibarchive.git

Only set the filename-present bit if we actually write the filename
---

diff --git a/libarchive/archive_write_add_filter_gzip.c b/libarchive/archive_write_add_filter_gzip.c
index 6784798d2..47081cc30 100644
--- a/libarchive/archive_write_add_filter_gzip.c
+++ b/libarchive/archive_write_add_filter_gzip.c
@@ -222,7 +222,7 @@ archive_compressor_gzip_open(struct archive_write_filter *f)
 	data->compressed[0] = 0x1f; /* GZip signature bytes */
 	data->compressed[1] = 0x8b;
 	data->compressed[2] = 0x08; /* "Deflate" compression */
-	data->compressed[3] = data->original_filename == NULL ? 0 : 0x8;
+	data->compressed[3] = 0x00; /* Flags */
 	if (data->timestamp >= 0) {
 		time_t t = time(NULL);
 		data->compressed[4] = (uint8_t)(t)&0xff;  /* Timestamp */
@@ -257,6 +257,7 @@ archive_compressor_gzip_open(struct archive_write_filter *f)
 			ofn_max_length = ofn_space_available;
 		}
 		if (ofn_length < ofn_max_length) {
+			data->compressed[3] |= 0x8;
 			strcpy((char*)data->compressed + 10,
 			       data->original_filename);
 			data->stream.next_out += ofn_length + 1;