libvips/libsrc/iofuncs/im_binfile.c

183 lines
4.1 KiB
C

/* @(#) Function to read a binary file with no header to vasari file
* @(#) Usage:
* @(#)
* @(#) IMAGE *
* @(#) im_binfile(in, xs, ys, bands, offset)
* @(#) char *in;
* @(#) int xs, ys, bands, offset;
* @(#)
* @(#) The function returns NULL on error.
* @(#) Works for uchar input only.
* Author: N. Dessipris
* Written on: 31/7/91
* Modified on:
* 15/6/93 JC
* - includes fixed
* - externs fixed
* 7/6/94 JC
* - im_outcheck() added
* 13/12/94 JC
* - now uses im_mapfile(), rather than read() and copy
* - hence returns a new IMAGE descriptor
* 25/5/95 JC
* - oops! mess up with fd on errors
* 5/2/04 JC
* - added offset param
* 26/5/04
* - data init was broken by im_mapfile() change
* 30/9/05
* - use int64 for size calcs so we can map >31 bit files on 64 bit
* machines
* - delay mmap() for large files, cf. im_openin()
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include <vips/vips.h>
#include <vips/internal.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
IMAGE *
im_binfile( const char *name, int xs, int ys, int bands, int offset )
{
IMAGE *im;
gint64 length;
gint64 psize;
/* Check parameters.
*/
if( xs <= 0 || ys <= 0 || bands <=0 ) {
im_error( "im_binfile", _( "bad parameters" ) );
return( NULL );
}
/* Make new output image for us.
*/
if( !(im = im_init( name )) )
return( NULL );
if( (im->fd = im__open_image_file( name )) == -1 ) {
im_close( im );
return( NULL );
}
im->dtype = IM_OPENIN;
im->sizeof_header = offset;
/* Predict file size.
*/
psize = (gint64) xs * ys * bands + offset;
/* Read the file length and check against what we think
* the size should be.
*/
if( (length = im_file_length( im->fd )) == -1 ) {
im_close( im );
return( NULL );
}
/* Very common, so special message.
*/
if( psize > length ) {
im_error( "im_binfile", _( "unable to open %s: "
"file has been truncated" ), im->filename );
im_close( im );
return( NULL );
}
/* Just wierd. Only print a warning for this, since we should
* still be able to process it without coredumps.
*/
if( psize < length )
im_warn( "im_binfile", _( "%s is longer than expected" ),
im->filename );
/* If the predicted size is under our mmap threshold, mmap the whole
* thing now. Otherwise, delay the map until region create and we'll
* use a rolling window. See also im_openin().
*/
if( psize < im__mmap_limit ) {
if( im_mapfile( im ) ) {
im_close( im );
return( NULL );
}
im->data = im->baseaddr + offset;
im->dtype = IM_MMAPIN;
}
/* Set header fields.
*/
im->Xsize = xs;
im->Ysize = ys;
im->Bands = bands;
/* Set others to standard values.
*/
im->Bbits = IM_BBITS_BYTE;
im->BandFmt = IM_BANDFMT_UCHAR;
im->Coding = IM_CODING_NONE;
if( bands == 1 )
im->Type = IM_TYPE_B_W;
else if( bands == 3 )
im->Type = IM_TYPE_RGB;
else
im->Type = IM_TYPE_MULTIBAND;
im->Xres = 1.0;
im->Yres = 1.0;
im->Length = 0;
im->Compression = 0;
im->Level = 0;
im->Xoffset = 0;
im->Yoffset = 0;
/* Init others too.
*/
im->dhint = IM_THINSTRIP;
return( im );
}