321 lines
6.3 KiB
C
321 lines
6.3 KiB
C
/* @(#) Function which checks the structures imagein and imageout
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* @(#) It returns a valid value only if ip and op are set properly
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* @(#) Cases of returned integer value
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* @(#)
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* @(#) int im_iocheck(imagein, imageout)
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* @(#) IMAGE *imagein, *imageout;
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* @(#)
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* @(#) Returns -1 on fail
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* @(#)
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*
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* Copyright: Nicos Dessipris
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* Written on: 12/02/1990
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* Modified on :
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* 15/4/93 JC
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* - im_incheck(), im_outcheck() added.
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* - type field now checked.
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* 10/6/93 JC
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* - auto-fallback to old-style input added
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* 6/6/95 JC
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* - revised and improved fallback code
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*/
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/* @(#) Try to make an IMAGE writeable. im_mmapin files become im_mmapinrw
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* @(#) files, buffers are left alone and output files and partial images
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* @(#) generate an error.
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* @(#)
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* @(#) int im_rwcheck( im )
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* @(#) IMAGE *im;
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* @(#)
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* @(#) Returns non-zero on error.
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* @(#)
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* Copyright: John Cupitt
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* Written on: 17/6/92
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* Updated on:
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* 15/4/93
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* - checks for partial images added
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* - now uses type field
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* 31/8/93 JC
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* - returns ok for IM_MMAPINRW type files now too
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* - returns -1 rather than 1 on error
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* - ANSIfied
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* 1/10/97 JC
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* - moved here, and renamed im_rwcheck()
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* 13/2/01 JC
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* - im_image_sanity() checks added
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif /*HAVE_UNISTD_H*/
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif /*HAVE_SYS_FILE_H*/
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#include <vips/vips.h>
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#include <vips/internal.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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/* Convert a partial to a setbuf.
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*/
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static int
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convert_ptob( IMAGE *im )
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{
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IMAGE *t1;
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/* Change to IM_SETBUF. First, make a memory buffer and copy into that.
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*/
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if( !(t1 = im_open( "im_incheck:1", "t" )) )
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return( -1 );
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if( im_copy( im, t1 ) ) {
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im_close( t1 );
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return( -1 );
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}
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/* Copy new stuff in. We can't im__close( im ) and free stuff, as this
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* would kill of lots of regions and cause dangling pointers
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* elsewhere.
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*/
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im->dtype = IM_SETBUF;
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im->data = t1->data;
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t1->data = NULL;
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/* Close temp image.
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*/
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if( im_close( t1 ) )
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return( -1 );
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return( 0 );
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}
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/* Convert an openin to a mmapin.
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*/
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static int
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convert_otom( IMAGE *im )
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{
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/* just mmap() the whole thing.
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*/
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if( im_mapfile( im ) )
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return( -1 );
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im->data = im->baseaddr + im->sizeof_header;
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im->dtype = IM_MMAPIN;
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return( 0 );
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}
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/* Check that an image is readable by old-style VIPS functions.
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*/
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int
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im_incheck( IMAGE *im )
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{
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g_assert( !im_image_sanity( im ) );
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#ifdef DEBUG_IO
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printf( "im_incheck: old-style input for %s\n", im->filename );
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#endif/*DEBUG_IO*/
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switch( im->dtype ) {
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case IM_SETBUF:
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case IM_SETBUF_FOREIGN:
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/* Should have been written to.
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*/
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if( !im->data ) {
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im_error( "im_incheck",
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"%s", _( "no image data" ) );
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return( -1 );
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}
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break;
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case IM_MMAPIN:
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case IM_MMAPINRW:
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/* Can read from all these, in principle anyway.
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*/
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break;
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case IM_PARTIAL:
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#ifdef DEBUG_IO
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printf( "im_incheck: converting partial image to WIO\n" );
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#endif/*DEBUG_IO*/
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/* Change to a setbuf, so our caller can use it.
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*/
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if( convert_ptob( im ) )
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return( -1 );
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break;
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case IM_OPENIN:
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#ifdef DEBUG_IO
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printf( "im_incheck: converting openin image for old-style input\n" );
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#endif/*DEBUG_IO*/
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/* Change to a MMAPIN.
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*/
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if( convert_otom( im ) )
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return( -1 );
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break;
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case IM_OPENOUT:
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/* Close file down and reopen as im_mmapin.
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*/
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#ifdef DEBUG_IO
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printf( "im_incheck: auto-rewind of %s\n", im->filename );
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#endif/*DEBUG_IO*/
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if( im__close( im ) || im_openin( im ) ) {
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im_error( "im_incheck",
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_( "auto-rewind for %s failed" ),
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im->filename );
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return( -1 );
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}
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break;
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default:
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im_error( "im_incheck",
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"%s", _( "image not readable" ) );
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return( -1 );
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}
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return( 0 );
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}
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/* Check that an image is writeable.
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*/
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int
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im_outcheck( IMAGE *im )
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{
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#ifdef DEBUG_IO
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printf( "im_outcheck: old-style output for %s\n", im->filename );
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#endif/*DEBUG_IO*/
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switch( im->dtype ) {
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case IM_PARTIAL:
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/* Make sure nothing is attached.
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*/
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if( im->generate ) {
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im_error( "im_outcheck",
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"%s", _( "image already written" ) );
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return( -1 );
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}
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/* Cannot do old-style write to PARTIAL. Turn to SETBUF.
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*/
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im->dtype = IM_SETBUF;
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/* Fall through to SETBUF case.
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*/
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case IM_SETBUF:
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/* Check that it has not been im_setupout().
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*/
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if( im->data ) {
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im_error( "im_outcheck",
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"%s", _( "image already written" ) );
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return( -1 );
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}
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break;
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case IM_OPENOUT:
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case IM_SETBUF_FOREIGN:
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/* Can write to this ok.
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*/
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break;
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default:
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im_error( "im_outcheck",
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"%s", _( "image not writeable" ) );
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return( -1 );
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}
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return( 0 );
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}
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/* Check a pair of fds for IO.
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*/
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int
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im_iocheck( IMAGE *in, IMAGE *out )
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{
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return( im_incheck( in ) || im_outcheck( out ) );
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}
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int
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im_rwcheck( IMAGE *im )
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{
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/* Do an im_incheck(). This will rewind im_openout() files, and
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* generate im_partial() files.
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*/
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if( im_incheck( im ) ) {
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im_error( "im_rwcheck",
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"%s", _( "unable to rewind file" ) );
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return( -1 );
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}
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/* Look at the type.
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*/
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switch( im->dtype ) {
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case IM_SETBUF:
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case IM_SETBUF_FOREIGN:
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case IM_MMAPINRW:
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/* No action necessary.
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*/
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break;
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case IM_MMAPIN:
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/* Try to remap read-write.
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*/
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if( im_remapfilerw( im ) )
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return( -1 );
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break;
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default:
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im_error( "im_rwcheck",
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"%s", _( "bad file type" ) );
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return( -1 );
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}
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return( 0 );
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}
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