Do not decompress concatenated zlib streams -- only gzip streams.
diff --git a/pigz.c b/pigz.c
index 504e93e..8f120cd 100644
--- a/pigz.c
+++ b/pigz.c
@@ -2730,9 +2730,9 @@
cont = 1;
}
- /* if a gzip or zlib entry follows a gzip or zlib entry, decompress it
- (don't replace saved header information from first entry) */
- } while (g.form < 2 && (ret = get_header(0)) == 8 && g.form < 2);
+ /* if a gzip entry follows a gzip entry, decompress it (don't replace
+ saved header information from first entry) */
+ } while (g.form == 0 && (ret = get_header(0)) == 8 && g.form == 0);
/* gzip -cdf copies junk after gzip stream directly to output */
if (g.form < 2 && ret == -2 && g.force && g.pipeout && g.decode != 2 &&
