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.\" $Id: TIFFbuffer.3tiff,v 1.2 2005/11/02 11:07:18 dron Exp $
.\"
.\" Copyright (c) 1995 Sam Leffler
.\" Copyright (c) 1995 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
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.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
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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 TIFFBUFFER 3TIFF "November 1, 2005" "libtiff"
.SH NAME
TIFFReadBufferSetup, TIFFWriteBufferSetup \- I/O buffering control routines
.SH SYNOPSIS
.nf
.B "#include <tiffio.h>"
.sp
.BI "int TIFFReadBufferSetup(TIFF *" tif ", tdata_t " buffer ", tsize_t " size ");"
.BI "int TIFFWriteBufferSetup(TIFF *" tif ", tdata_t " buffer ", tsize_t " size ");"
.fi
.SH DESCRIPTION
The following routines are provided for client-control of the I/O buffers used
by the library. Applications need never use these routines; they are provided
only for ``intelligent clients'' that wish to optimize memory usage and/or
eliminate potential copy operations that can occur when working with images
that have data stored without compression.
.PP
.I TIFFReadBufferSetup
sets up the data buffer used to read raw (encoded) data from a file. If the
specified pointer is
.SM NULL
(zero), then a buffer of the appropriate size is allocated. Otherwise the
caller must guarantee that the buffer is large enough to hold any individual
strip of raw data.
.I TIFFReadBufferSetup
returns a non-zero value if the setup was successful and zero otherwise.
.PP
.I TIFFWriteBufferSetup
sets up the data buffer used to write raw (encoded) data to a file. If the
specified
.I size
is \-1 then the buffer size is selected to hold a complete tile or strip, or
at least 8 kilobytes, whichever is greater. If the specified
.I buffer
is 
.SM NULL
(zero), then a buffer of the appropriate size is dynamically allocated.
.I TIFFWriteBufferSetup
returns a non-zero value if the setup was successful and zero otherwise.
.SH DIAGNOSTICS
.BR "%s: No space for data buffer at scanline %ld" .
.I TIFFReadBufferSetup
was unable to dynamically allocate space for a data buffer.
.PP
.BR "%s: No space for output buffer" .
.I TIFFWriteBufferSetup
was unable to dynamically allocate space for a data buffer.
.SH "SEE ALSO"
.BR libtiff (3TIFF)
.PP
Libtiff library home page:
.BR http://www.remotesensing.org/libtiff/

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