From 887af41d021b19fa6d79b299d9cf10d483ca61f3 Mon Sep 17 00:00:00 2001
From: oliskoli <oliskoli@f51c46e8-681c-474f-0cfe-069cfd0219fb>
Date: Tue, 21 Nov 2006 21:12:37 +0000
Subject: [PATCH] Add workaround for zlib bug "gzread buffer error on empty
 files".

---
 gpsbabel/gbfile.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gpsbabel/gbfile.c b/gpsbabel/gbfile.c
index bc5505550..0916f63d0 100644
--- a/gpsbabel/gbfile.c
+++ b/gpsbabel/gbfile.c
@@ -228,6 +228,11 @@ gbfread(void *buf, const gbsize_t size, const gbsize_t members, gbfile *file)
 			const char *errtxt;
 			
 			errtxt = gzerror(file->handle.gz, &errnum);
+			
+			/* Workaround for zlib bug: buffer error on empty files */
+			if ((errnum == Z_BUF_ERROR) && (gztell(file->handle.gz) == 0)) {
+				return (gbsize_t) 0;
+			}
 			if ((errnum != Z_STREAM_END) && (errnum != 0))
 				fatal("%s: zlib returned error %d ('%s')!\n",
 					file->module, errnum, errtxt);
-- 
2.30.2