.\" $Id: TIFFWriteDirectory.3tiff,v 1.3 2010-12-12 01:45:35 faxguy 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

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.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  

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.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR

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.\"

.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>"</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 preceding 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/