[Zlib-devel] Allow gzread to continue after EOF

[Mark Brown]

This patch by Khalid Aziz <khalid_aziz at hp.com> allows gzio to continue
reading a file where it has seen EOF should it continue to grow (for
example, a log file being written using gzio).  This worked with zlib
1.2.1 but fails with more recent versions of zlib.

Could you please consider it for inclusion in the next version of zlib?

-- 
"You grabbed my hand and we fell into it, like a daydream - or a fever."

diff -urN zlib-1.2.2.orig/gzio.c zlib-1.2.2/gzio.c
--- zlib-1.2.2.orig/gzio.c	2004-10-03 22:30:37.000000000 -0400
+++ zlib-1.2.2/gzio.c	2005-03-01 16:43:05.000000000 -0500
@@ -403,7 +403,9 @@
     if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR;
 
     if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1;
-    if (s->z_err == Z_STREAM_END) return 0;  /* EOF */
+    if (s->z_eof == 1) {
+      return 0;  /* EOF */
+    }
 
     next_out = (Byte*)buf;
     s->stream.next_out = (Bytef*)buf;