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-.\" $Id: TIFFOpen.3tiff,v 1.2 2005/07/01 12:36:22 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 TIFFOpen 3TIFF "July 1, 2005" "libtiff"
-.SH NAME
-TIFFOpen, TIFFFdOpen, TIFFClientOpen \- open a
-.SM TIFF
-file for reading or writing
-.SH SYNOPSIS
-.B "#include <tiffio.h>"
-.sp
-.BI "TIFF* TIFFOpen(const char *" filename ", const char *" mode ")"
-.br
-.BI "TIFF* TIFFFdOpen(const int " fd ", const char *" filename ", const char *" mode ")"
-.sp
-.B "typedef tsize_t (*TIFFReadWriteProc)(thandle_t, tdata_t, tsize_t);"
-.br
-.B "typedef toff_t (*TIFFSeekProc)(thandle_t, toff_t, int);"
-.br
-.B "typedef int (*TIFFCloseProc)(thandle_t);"
-.br
-.B "typedef toff_t (*TIFFSizeProc)(thandle_t);"
-.br
-.B "typedef int (*TIFFMapFileProc)(thandle_t, tdata_t*, toff_t*);"
-.br
-.B "typedef void (*TIFFUnmapFileProc)(thandle_t, tdata_t, toff_t);"
-.sp
-.BI "TIFF* TIFFClientOpen(const char *" filename ", const char *" mode ", thandle_t " clientdata ", TIFFReadWriteProc " readproc ", TIFFReadWriteProc " writeproc ", TIFFSeekProc " seekproc ", TIFFCloseProc " closeproc ", TIFFSizeProc " sizeproc ", TIFFMapFileProc " mapproc ", TIFFUnmapFileProc " unmapproc ")"
-.SH DESCRIPTION
-.IR TIFFOpen
-opens a
-.SM TIFF
-file whose name is
-.I filename
-and returns a handle to be used in subsequent calls to routines in
-.IR libtiff .
-If the open operation fails, then zero is returned.
-The
-.I mode
-parameter specifies if the file is to be opened for reading (``r''),
-writing (``w''), or appending (``a'') and, optionally, whether
-to override certain default aspects of library operation (see below).
-When a file is opened for appending, existing data will not
-be touched; instead new data will be written as additional subfiles.
-If an existing file is opened for writing, all previous data is
-overwritten.
-.PP
-If a file is opened for reading, the first
-.SM TIFF
-directory in the file is automatically read
-(also see
-.IR TIFFSetDirectory (3TIFF)
-for reading directories other than the first).
-If a file is opened for writing or appending, a default directory
-is automatically created for writing subsequent data.
-This directory has all the default values specified in
-.SM TIFF
-Revision 6.0:
-.IR BitsPerSample =1,
-.IR ThreshHolding "=bilevel art scan,"
-.IR FillOrder =1
-(most significant bit of each data byte is filled first),
-.IR Orientation =1
-(the 0th row represents the visual top of the image, and the 0th
-column represents the visual left hand side),
-.IR SamplesPerPixel =1,
-.IR RowsPerStrip =infinity,
-.IR ResolutionUnit =2
-(inches), and
-.IR Compression =1
-(no compression).
-To alter these values, or to define values for additional fields,
-.IR TIFFSetField (3TIFF)
-must be used.
-.PP
-.IR TIFFFdOpen
-is like
-.IR TIFFOpen
-except that it opens a
-.SM TIFF
-file given an open file descriptor
-.IR fd .
-The file's name and mode must reflect that of the open descriptor.
-The object associated with the file descriptor
-.BR "must support random access" .
-.PP
-.IR TIFFClientOpen
-is like
-.IR TIFFOpen
-except that the caller supplies a collection of functions that the
-library will use to do \s-1UNIX\s+1-like I/O operations. 
-The
-.I readproc
-and
-.I writeproc
-are called to read and write data at the current file position.
-.I seekproc
-is called to change the current file position a la
-.IR lseek (2).
-.I closeproc
-is invoked to release any resources associated with an open file.
-.I sizeproc
-is invoked to obtain the size in bytes of a file.
-.I mapproc
-and
-.I unmapproc
-are called to map and unmap a file's contents in memory; c.f.
-.IR mmap (2)
-and
-.IR munmap (2).
-The
-.I clientdata
-parameter is an opaque ``handle'' passed to the client-specified
-routines passed as parameters to
-.IR TIFFClientOpen .
-.SH OPTIONS
-The open mode parameter can include the following flags in
-addition to the ``r'', ``w'', and ``a'' flags.
-Note however that option flags must follow the read-write-append
-specification.
-.TP
-.B l
-When creating a new file force information be written with
-Little-Endian byte order (but see below).
-By default the library will create new files using the native
-.SM CPU
-byte order.
-.TP
-.B b
-When creating a new file force information be written with
-Big-Endian byte order (but see below).
-By default the library will create new files using the native
-.SM CPU
-byte order.
-.TP
-.B L
-Force image data that is read or written to be treated with
-bits filled from Least Significant Bit (\s-1LSB\s+1) to
-Most Significant Bit (\s-1MSB\s+1).
-Note that this is the opposite to the way the library has
-worked from its inception.
-.TP
-.B B
-Force image data that is read or written to be treated with
-bits filled from Most Significant Bit (\s-1MSB\s+1) to
-Least Significant Bit (\s-1LSB\s+1); this is the default.
-.TP
-.B H
-Force image data that is read or written to be treated with
-bits filled in the same order as the native 
-.SM CPU.
-.TP
-.B M
-Enable the use of memory-mapped files for images opened read-only.
-If the underlying system does not support memory-mapped files
-or if the specific image being opened cannot be memory-mapped
-then the library will fallback to using the normal system interface
-for reading information.
-By default the library will attempt to use memory-mapped files.
-.TP
-.B m
-Disable the use of memory-mapped files.
-.TP
-.B C
-Enable the use of ``strip chopping'' when reading images
-that are comprised of a single strip or tile of uncompressed data.
-Strip chopping is a mechanism by which the library will automatically
-convert the single-strip image to multiple strips,
-each of which has about 8 Kilobytes of data.
-This facility can be useful in reducing the amount of memory used
-to read an image because the library normally reads each strip
-in its entirety.
-Strip chopping does however alter the apparent contents of the
-image because when an image is divided into multiple strips it
-looks as though the underlying file contains multiple separate
-strips.
-Finally, note that default handling of strip chopping is a compile-time
-configuration parameter.
-The default behaviour, for backwards compatibility, is to enable
-strip chopping.
-.TP
-.B c
-Disable the use of strip chopping when reading images.
-.TP
-.B h
-Read TIFF header only, do not load the first image directory. That could be
-useful in case of the broken first directory. We can open the file and proceed
-to the other directories.
-.SH "BYTE ORDER"
-The 
-.SM TIFF
-specification (\fBall versions\fP) states that compliant readers
-.IR "must be capable of reading images written in either byte order" .
-Nonetheless some software that claims to support the reading of
-.SM TIFF
-images is incapable of reading images in anything but the native
-.SM CPU
-byte order on which the software was written.
-(Especially notorious
-are applications written to run on Intel-based machines.)
-By default the library will create new files with the native
-byte-order of the 
-.SM CPU
-on which the application is run.
-This ensures optimal performance and is portable to any application
-that conforms to the TIFF specification.
-To force the library to use a specific byte-order when creating
-a new file the ``b'' and ``l'' option flags may be included in
-the call to open a file; for example, ``wb'' or ``wl''.
-.SH "RETURN VALUES"
-Upon successful completion 
-.IR TIFFOpen ,
-.IR TIFFFdOpen ,
-and
-.IR TIFFClientOpen
-return a 
-.SM TIFF
-pointer.
-Otherwise, NULL is returned.
-.SH DIAGNOSTICS
-All error messages are directed to the
-.IR TIFFError (3TIFF)
-routine.
-Likewise, warning messages are directed to the
-.IR TIFFWarning (3TIFF)
-routine.
-.PP
-\fB"%s": Bad mode\fP.
-The specified
-.I mode
-parameter was not one of ``r'' (read), ``w'' (write), or ``a'' (append).
-.PP
-.BR "%s: Cannot open" .
-.IR TIFFOpen ()
-was unable to open the specified filename for read/writing.
-.PP
-.BR "Cannot read TIFF header" .
-An error occurred while attempting to read the header information.
-.PP
-.BR "Error writing TIFF header" .
-An error occurred while writing the default header information
-for a new file.
-.PP
-.BR "Not a TIFF file, bad magic number %d (0x%x)" .
-The magic number in the header was not (hex)
-0x4d4d or (hex) 0x4949.
-.PP
-.BR "Not a TIFF file, bad version number %d (0x%x)" .
-The version field in the header was not 42 (decimal).
-.PP
-.BR "Cannot append to file that has opposite byte ordering" .
-A file with a byte ordering opposite to the native byte
-ordering of the current machine was opened for appending (``a'').
-This is a limitation of the library.
-.SH "SEE ALSO"
-.IR libtiff (3TIFF),
-.IR TIFFClose (3TIFF)