commit 8c9dbee088d8b43cdae47b9c5f711058bd1f17f1
Author: erouault <erouault>
Date:   Tue Dec 13 18:15:48 2016 +0000

    * libtiff/tif_fax3.h: revert change done on 2016-01-09 that made
    Param member of TIFFFaxTabEnt structure a uint16 to reduce size of
    the binary. It happens that the Hylafax software uses the tables that
    follow this typedef (TIFFFaxMainTable, TIFFFaxWhiteTable,
    TIFFFaxBlackTable), also they are not in a public libtiff header.
    Raised by Lee Howard.
    Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2636

diff --git a/ChangeLog b/ChangeLog
index ee6fd802..558db20e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2016-12-13 Even Rouault <even.rouault at spatialys.com>
+
+	* libtiff/tif_fax3.h: revert change done on 2016-01-09 that made
+	Param member of TIFFFaxTabEnt structure a uint16 to reduce size of
+	the binary. It happens that the Hylafax software uses the tables that
+	follow this typedef (TIFFFaxMainTable, TIFFFaxWhiteTable,
+	TIFFFaxBlackTable), also they are not in a public libtiff header.
+	Raised by Lee Howard.
+	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2636
+
 2016-12-03 Even Rouault <even.rouault at spatialys.com>
 
 	* tools/tiffcp.c: replace assert( (bps % 8) == 0 ) by a non assert check.
diff --git a/libtiff/tif_fax3.h b/libtiff/tif_fax3.h
index e0b2ca6b..45ce43f1 100644
--- a/libtiff/tif_fax3.h
+++ b/libtiff/tif_fax3.h
@@ -1,4 +1,4 @@
-/* $Id: tif_fax3.h,v 1.11 2016-01-23 21:20:34 erouault Exp $ */
+/* $Id: tif_fax3.h,v 1.12 2016-12-13 18:15:48 erouault Exp $ */
 
 /*
  * Copyright (c) 1990-1997 Sam Leffler
@@ -81,10 +81,12 @@ extern void _TIFFFax3fillruns(unsigned char*, uint32*, uint32*, uint32);
 #define S_MakeUp   11
 #define S_EOL      12
 
+/* WARNING: do not change the layout of this structure as the Halyfax software */
+/* really depends on it. See http://bugzilla.maptools.org/show_bug.cgi?id=2636 */
 typedef struct {                /* state table entry */
 	unsigned char State;    /* see above */
 	unsigned char Width;    /* width of code in bits */
-	uint16 Param;           /* unsigned 16-bit run length in bits */
+	uint32 Param;           /* unsigned 32-bit run length in bits (holds on 16 bit actually, but cannot be changed. See above warning) */
 } TIFFFaxTabEnt;
 
 extern const TIFFFaxTabEnt TIFFFaxMainTable[];