src/tiff/man/TIFFWriteDirectory.3tiff

.\" $Id: TIFFWriteDirectory.3tiff,v 1.2 2005/11/02 11:07:18 dron Exp $
.\"
.\" Copyright (c) 1988-1997 Sam Leffler
.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
.\"
.\" Permission to use, copy, modify, distribute, and sell this software and
.\" its documentation for any purpose is hereby granted without fee, provided
.\" that (i) the above copyright notices and this permission notice appear in
.\" all copies of the software and related documentation, and (ii) the names of
.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
.\" publicity relating to the software without the specific, prior written
.\" permission of Sam Leffler and Silicon Graphics.
.\"
.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
.\"
.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
.\" OF THIS SOFTWARE.
.\"
.if n .po 0
.TH TIFFWriteDirectory 3TIFF "September 26, 2001" "libtiff"
.SH NAME
TIFFWriteDirectory, TIFFRewriteDirectory, TIFFCheckpointDirectory \- write the
current directory in an open
.SM TIFF
file
.SH SYNOPSIS
.B "#include <tiffio.h>"
.sp
.BI "int TIFFWriteDirectory(TIFF *" tif ")"
.br
.BI "int TIFFRewriteDirectory(TIFF *" tif ")"
.br
.BI "int TIFFCheckpointDirectory(TIFF *" tif ")"
.SH DESCRIPTION
.IR TIFFWriteDirectory
will write the contents of the current directory to the file and setup to
create a new subfile in the same file. Applications only need to call
.IR TIFFWriteDirectory
when writing multiple subfiles to a single
.SM TIFF
file.
.IR TIFFWriteDirectory
is automatically called by
.IR TIFFClose
and
.IR TIFFFlush
to write a modified directory if the file is open for writing.
.PP
The
.IR TIFFRewriteDirectory
function operates similarly to
.IR TIFFWriteDirectory,
but can be called with directories previously read or written that already
have an established location in the file.  It will rewrite the directory,
but instead of place it at it's old location (as
.IR TIFFWriteDirectory
would) it will place them at the end of the file, correcting the pointer from
the preceeding directory or file header to point to it's new location.  This
is particularly important in cases where the size of the directory and
pointed to data has grown, so it won't fit in the space available at the
old location.
.PP
The
.IR TIFFCheckpointDirectory
writes the current state of the tiff directory into the file to make what
is currently in the file readable.  Unlike
.IR TIFFWriteDirectory,
.IR TIFFCheckpointDirectory
does not free up the directory data structures in memory, so they can be
updated (as strips/tiles are written) and written again.  Reading such
a partial file you will at worst get a tiff read error for the first
strip/tile encountered that is incomplete, but you will at least get
all the valid data in the file before that.  When the file is complete,
just use
.IR TIFFWriteDirectory
as usual to finish it off cleanly.
.SH "RETURN VALUES"
1 is returned when the contents are successfully written to the file.
Otherwise, 0 is returned if an error was encountered when writing
the directory contents.
.SH DIAGNOSTICS
All error messages are directed to the
.IR TIFFError (3TIFF)
routine.
.PP
.BR "Error post-encoding before directory write" .
Before writing the contents of the current directory, any pending data are
flushed. This message indicates that an error occurred while doing this.
.PP
.BR "Error flushing data before directory write" .
Before writing the contents of the current directory, any pending data are
flushed. This message indicates that an error occurred while doing this.
.PP
.BR "Cannot write directory, out of space" .
There was not enough space to allocate a temporary area for the directory that
was to be written.
.PP
.BR "Error writing directory count" .
A write error occurred when writing the count of fields in the directory.
.PP
.BR "Error writing directory contents" .
A write error occurred when writing the directory fields.
.PP
.BR "Error writing directory link" .
A write error occurred when writing the link to the next directory.
.PP
\fBError writing data for field "%s"\fP.
A write error occurred when writing indirect data for the specified field.
.PP
.BR "Error writing TIFF header" .
A write error occurred when re-writing header at the front of the file.
.PP
.BR "Error fetching directory count" .
A read error occurred when fetching the directory count field for
a previous directory.
This can occur when setting up a link to the directory that is being
written.
.PP
.BR "Error fetching directory link" .
A read error occurred when fetching the directory link field for
a previous directory.
This can occur when setting up a link to the directory that is being
written.
.SH "SEE ALSO"
.BR TIFFOpen (3TIFF),
.BR TIFFError (3TIFF),
.BR TIFFReadDirectory (3TIFF),
.BR TIFFSetDirectory (3TIFF),
.BR libtiff (3TIFF)
.PP
Libtiff library home page:
.BR http://www.remotesensing.org/libtiff/
Commit	Line	Data
	1	.\" $Id: TIFFWriteDirectory.3tiff,v 1.2 2005/11/02 11:07:18 dron Exp $
	2	.\"
	3	.\" Copyright (c) 1988-1997 Sam Leffler
	4	.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
	5	.\"
	6	.\" Permission to use, copy, modify, distribute, and sell this software and
	7	.\" its documentation for any purpose is hereby granted without fee, provided
	8	.\" that (i) the above copyright notices and this permission notice appear in
	9	.\" all copies of the software and related documentation, and (ii) the names of
	10	.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
	11	.\" publicity relating to the software without the specific, prior written
	12	.\" permission of Sam Leffler and Silicon Graphics.
	13	.\"
	14	.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	15	.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	16	.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	17	.\"
	18	.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	19	.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	20	.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	21	.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	22	.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	23	.\" OF THIS SOFTWARE.
	24	.\"
	25	.if n .po 0
	26	.TH TIFFWriteDirectory 3TIFF "September 26, 2001" "libtiff"
	27	.SH NAME
	28	TIFFWriteDirectory, TIFFRewriteDirectory, TIFFCheckpointDirectory \- write the
	29	current directory in an open
	30	.SM TIFF
	31	file
	32	.SH SYNOPSIS
	33	.B "#include <tiffio.h>"
	34	.sp
	35	.BI "int TIFFWriteDirectory(TIFF *" tif ")"
	36	.br
	37	.BI "int TIFFRewriteDirectory(TIFF *" tif ")"
	38	.br
	39	.BI "int TIFFCheckpointDirectory(TIFF *" tif ")"
	40	.SH DESCRIPTION
	41	.IR TIFFWriteDirectory
	42	will write the contents of the current directory to the file and setup to
	43	create a new subfile in the same file. Applications only need to call
	44	.IR TIFFWriteDirectory
	45	when writing multiple subfiles to a single
	46	.SM TIFF
	47	file.
	48	.IR TIFFWriteDirectory
	49	is automatically called by
	50	.IR TIFFClose
	51	and
	52	.IR TIFFFlush
	53	to write a modified directory if the file is open for writing.
	54	.PP
	55	The
	56	.IR TIFFRewriteDirectory
	57	function operates similarly to
	58	.IR TIFFWriteDirectory,
	59	but can be called with directories previously read or written that already
	60	have an established location in the file. It will rewrite the directory,
	61	but instead of place it at it's old location (as
	62	.IR TIFFWriteDirectory
	63	would) it will place them at the end of the file, correcting the pointer from
	64	the preceeding directory or file header to point to it's new location. This
	65	is particularly important in cases where the size of the directory and
	66	pointed to data has grown, so it won't fit in the space available at the
	67	old location.
	68	.PP
	69	The
	70	.IR TIFFCheckpointDirectory
	71	writes the current state of the tiff directory into the file to make what
	72	is currently in the file readable. Unlike
	73	.IR TIFFWriteDirectory,
	74	.IR TIFFCheckpointDirectory
	75	does not free up the directory data structures in memory, so they can be
	76	updated (as strips/tiles are written) and written again. Reading such
	77	a partial file you will at worst get a tiff read error for the first
	78	strip/tile encountered that is incomplete, but you will at least get
	79	all the valid data in the file before that. When the file is complete,
	80	just use
	81	.IR TIFFWriteDirectory
	82	as usual to finish it off cleanly.
	83	.SH "RETURN VALUES"
	84	1 is returned when the contents are successfully written to the file.
	85	Otherwise, 0 is returned if an error was encountered when writing
	86	the directory contents.
	87	.SH DIAGNOSTICS
	88	All error messages are directed to the
	89	.IR TIFFError (3TIFF)
	90	routine.
	91	.PP
	92	.BR "Error post-encoding before directory write" .
	93	Before writing the contents of the current directory, any pending data are
	94	flushed. This message indicates that an error occurred while doing this.
	95	.PP
	96	.BR "Error flushing data before directory write" .
	97	Before writing the contents of the current directory, any pending data are
	98	flushed. This message indicates that an error occurred while doing this.
	99	.PP
	100	.BR "Cannot write directory, out of space" .
	101	There was not enough space to allocate a temporary area for the directory that
	102	was to be written.
	103	.PP
	104	.BR "Error writing directory count" .
	105	A write error occurred when writing the count of fields in the directory.
	106	.PP
	107	.BR "Error writing directory contents" .
	108	A write error occurred when writing the directory fields.
	109	.PP
	110	.BR "Error writing directory link" .
	111	A write error occurred when writing the link to the next directory.
	112	.PP
	113	\fBError writing data for field "%s"\fP.
	114	A write error occurred when writing indirect data for the specified field.
	115	.PP
	116	.BR "Error writing TIFF header" .
	117	A write error occurred when re-writing header at the front of the file.
	118	.PP
	119	.BR "Error fetching directory count" .
	120	A read error occurred when fetching the directory count field for
	121	a previous directory.
	122	This can occur when setting up a link to the directory that is being
	123	written.
	124	.PP
	125	.BR "Error fetching directory link" .
	126	A read error occurred when fetching the directory link field for
	127	a previous directory.
	128	This can occur when setting up a link to the directory that is being
	129	written.
	130	.SH "SEE ALSO"
	131	.BR TIFFOpen (3TIFF),
	132	.BR TIFFError (3TIFF),
	133	.BR TIFFReadDirectory (3TIFF),
	134	.BR TIFFSetDirectory (3TIFF),
	135	.BR libtiff (3TIFF)
	136	.PP
	137	Libtiff library home page:
	138	.BR http://www.remotesensing.org/libtiff/