diff --git a/libtiff/tiffiop.h b/libtiff/tiffiop.h
index 3f2df726..f343991d 100644
--- a/libtiff/tiffiop.h
+++ b/libtiff/tiffiop.h
@@ -1,4 +1,4 @@
-/* $Id: tiffiop.h,v 1.48 2006-06-08 14:27:17 dron Exp $ */
+/* $Id: tiffiop.h,v 1.49 2006-07-28 09:50:14 dron Exp $ */
 
 /*
  * Copyright (c) 1988-1997 Sam Leffler
@@ -97,25 +97,26 @@ struct tiff {
 	int		tif_fd;		/* open file descriptor */
 	int		tif_mode;	/* open mode (O_*) */
 	uint32		tif_flags;
-#define	TIFF_FILLORDER		0x0003	/* natural bit fill order for machine */
-#define	TIFF_DIRTYHEADER	0x0004	/* header must be written on close */
-#define	TIFF_DIRTYDIRECT	0x0008	/* current directory must be written */
-#define	TIFF_BUFFERSETUP	0x0010	/* data buffers setup */
-#define	TIFF_CODERSETUP		0x0020	/* encoder/decoder setup done */
-#define	TIFF_BEENWRITING	0x0040	/* written 1+ scanlines to file */
-#define	TIFF_SWAB		0x0080	/* byte swap file information */
-#define	TIFF_NOBITREV		0x0100	/* inhibit bit reversal logic */
-#define	TIFF_MYBUFFER		0x0200	/* my raw data buffer; free on close */
-#define	TIFF_ISTILED		0x0400	/* file is tile, not strip- based */
-#define	TIFF_MAPPED		0x0800	/* file is mapped into memory */
-#define	TIFF_POSTENCODE		0x1000	/* need call to postencode routine */
-#define	TIFF_INSUBIFD		0x2000	/* currently writing a subifd */
-#define	TIFF_UPSAMPLED		0x4000	/* library is doing data up-sampling */ 
-#define	TIFF_STRIPCHOP		0x8000	/* enable strip chopping support */
+#define	TIFF_FILLORDER		0x00003	/* natural bit fill order for machine */
+#define	TIFF_DIRTYHEADER	0x00004	/* header must be written on close */
+#define	TIFF_DIRTYDIRECT	0x00008	/* current directory must be written */
+#define	TIFF_BUFFERSETUP	0x00010	/* data buffers setup */
+#define	TIFF_CODERSETUP		0x00020	/* encoder/decoder setup done */
+#define	TIFF_BEENWRITING	0x00040	/* written 1+ scanlines to file */
+#define	TIFF_SWAB		0x00080	/* byte swap file information */
+#define	TIFF_NOBITREV		0x00100	/* inhibit bit reversal logic */
+#define	TIFF_MYBUFFER		0x00200	/* my raw data buffer; free on close */
+#define	TIFF_ISTILED		0x00400	/* file is tile, not strip- based */
+#define	TIFF_MAPPED		0x00800	/* file is mapped into memory */
+#define	TIFF_POSTENCODE		0x01000	/* need call to postencode routine */
+#define	TIFF_INSUBIFD		0x02000	/* currently writing a subifd */
+#define	TIFF_UPSAMPLED		0x04000	/* library is doing data up-sampling */ 
+#define	TIFF_STRIPCHOP		0x08000	/* enable strip chopping support */
 #define	TIFF_HEADERONLY		0x10000	/* read header only, do not process */
 					/* the first directory */
 #define TIFF_NOREADRAW		0x20000 /* skip reading of raw uncompressed */
 					/* image data */
+#define	TIFF_INCUSTOMIFD	0x40000	/* currently writing a custom IFD */
 	toff_t		tif_diroff;	/* file offset of current directory */
 	toff_t		tif_nextdiroff;	/* file offset of following directory */
 	toff_t*		tif_dirlist;	/* list of offsets to already seen */
@@ -123,6 +124,8 @@ struct tiff {
 	tsize_t		tif_dirlistsize;/* number of entires in offset list */
 	uint16		tif_dirnumber;  /* number of already seen directories */
 	TIFFDirectory	tif_dir;	/* internal rep of current directory */
+	TIFFDirectory	tif_customdir;	/* custom IFDs are separated from
+					   the main ones */
 	TIFFHeader	tif_header;	/* file's header block */
 	const int*	tif_typeshift;	/* data type shift counts */
 	const long*	tif_typemask;	/* data type masks */
@@ -226,7 +229,7 @@ struct tiff {
 
 /* NB: the uint32 casts are to silence certain ANSI-C compilers */
 #define TIFFhowmany(x, y) ((((uint32)(x))+(((uint32)(y))-1))/((uint32)(y)))
-#define TIFFhowmany8(x) (((x)&0x07)?((uint32)(x)>>3)+1:(uint32)(x)>>3)
+#define TIFFhowmany8(x) (((x)&0x07) ? 1 : (uint32)(x)>>3)
 #define	TIFFroundup(x, y) (TIFFhowmany(x,y)*(y))
 
 #define TIFFmax(A,B) ((A)>(B)?(A):(B))