libvips/libsrc/iofuncs/predicate.c

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2007-08-29 18:23:50 +02:00
/* Test various predicates.
*
* J.Cupitt, 8/4/93.
* 13/10/95 JC
* - ANSIfied
* - im_ispoweroftwo() added
* 14/11/96 Jc
* - im_isjpeg() added
* 25/3/97 JC
* - im_isvips() added
* 14/4/97 JC
* - im_istifftiled() added
* 29/10/98 JC
* - im_isMSBfirst() and im_amiMSBfirst() added
* 16/6/99 JC
* - added im_existsf()
* 22/11/00 JC
* - added im_isppm()
* 23/4/01 JC
* - HAVE_TIFF turns on TIFFness
* 19/10/02 HB
* - PNG added
* 1/5/06
* - added exr
* 3/8/07
* - cleanups
*/
/*
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 <ctype.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /*HAVE_UNISTD_H*/
#ifdef HAVE_IO_H
#include <io.h>
#endif /*HAVE_IO_H*/
#include <string.h>
#include <limits.h>
#include <vips/vips.h>
#ifdef HAVE_TIFF
#include <tiffio.h>
#endif /*HAVE_TIFF*/
#ifdef HAVE_PNG
#include <png.h>
#endif /*HAVE_PNG*/
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#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
/* Test BandFmt.
*/
int
im_isint( IMAGE *im )
{
switch( im->BandFmt ) {
case IM_BANDFMT_UCHAR:
case IM_BANDFMT_CHAR:
case IM_BANDFMT_USHORT:
case IM_BANDFMT_SHORT:
case IM_BANDFMT_UINT:
case IM_BANDFMT_INT:
return( 1 );
case IM_BANDFMT_FLOAT:
case IM_BANDFMT_DOUBLE:
case IM_BANDFMT_COMPLEX:
case IM_BANDFMT_DPCOMPLEX:
return( 0 );
default:
error_exit( "im_isint: unknown image BandFmt" );
/*NOTREACHED*/
return( -1 );
}
}
/* Test endianness of an image. SPARC is MSB first
*/
int
im_isMSBfirst( IMAGE *im )
{
if( im->magic == IM_MAGIC_SPARC )
return( 1 );
else
return( 0 );
}
/* Test this processor for endianness. True for SPARC order.
*/
int
im_amiMSBfirst( void )
{
int test;
unsigned char *p = (unsigned char *) &test;
test = 0;
p[0] = 255;
if( test == 255 )
return( 0 );
else
return( 1 );
}
int
im_isuint( IMAGE *im )
{
switch( im->BandFmt ) {
case IM_BANDFMT_UCHAR:
case IM_BANDFMT_USHORT:
case IM_BANDFMT_UINT:
return( 1 );
case IM_BANDFMT_INT:
case IM_BANDFMT_SHORT:
case IM_BANDFMT_CHAR:
case IM_BANDFMT_FLOAT:
case IM_BANDFMT_DOUBLE:
case IM_BANDFMT_COMPLEX:
case IM_BANDFMT_DPCOMPLEX:
return( 0 );
default:
error_exit( "im_isuint: unknown image BandFmt" );
/*NOTREACHED*/
return( -1 );
}
}
int
im_isfloat( IMAGE *im )
{
switch( im->BandFmt ) {
case IM_BANDFMT_FLOAT:
case IM_BANDFMT_DOUBLE:
return( 1 );
case IM_BANDFMT_UCHAR:
case IM_BANDFMT_CHAR:
case IM_BANDFMT_USHORT:
case IM_BANDFMT_SHORT:
case IM_BANDFMT_UINT:
case IM_BANDFMT_INT:
case IM_BANDFMT_COMPLEX:
case IM_BANDFMT_DPCOMPLEX:
return( 0 );
default:
error_exit( "im_isfloat: unknown image BandFmt" );
/*NOTREACHED*/
return( -1 );
}
}
int
im_isscalar( IMAGE *im )
{
switch( im->BandFmt ) {
case IM_BANDFMT_UCHAR:
case IM_BANDFMT_CHAR:
case IM_BANDFMT_USHORT:
case IM_BANDFMT_SHORT:
case IM_BANDFMT_UINT:
case IM_BANDFMT_INT:
case IM_BANDFMT_FLOAT:
case IM_BANDFMT_DOUBLE:
return( 1 );
case IM_BANDFMT_COMPLEX:
case IM_BANDFMT_DPCOMPLEX:
return( 0 );
default:
error_exit( "im_isscalar: unknown image BandFmt" );
/*NOTREACHED*/
return( -1 );
}
}
int
im_iscomplex( IMAGE *im )
{
switch( im->BandFmt ) {
case IM_BANDFMT_COMPLEX:
case IM_BANDFMT_DPCOMPLEX:
return( 1 );
case IM_BANDFMT_UCHAR:
case IM_BANDFMT_CHAR:
case IM_BANDFMT_USHORT:
case IM_BANDFMT_SHORT:
case IM_BANDFMT_UINT:
case IM_BANDFMT_INT:
case IM_BANDFMT_FLOAT:
case IM_BANDFMT_DOUBLE:
return( 0 );
default:
error_exit( "im_iscomplex: unknown image BandFmt" );
/*NOTREACHED*/
return( -1 );
}
}
/* Read a few bytes from the start of a file. For sniffing file types.
*/
static int
get_bytes( const char *filename, unsigned char buf[], int len )
{
int fd;
/* File may not even exist (for tmp images for example!)
* so no hasty messages. And the file might be truncated, so no error
* on read either.
*/
#ifdef BINARY_OPEN
if( (fd = open( filename, O_RDONLY | O_BINARY )) == -1 )
#else /*BINARY_OPEN*/
if( (fd = open( filename, O_RDONLY )) == -1 )
#endif /*BINARY_OPEN*/
return( 0 );
if( read( fd, buf, len ) != len ) {
close( fd );
return( 0 );
}
close( fd );
return( 1 );
}
int
im_istiff( const char *filename )
{
unsigned char buf[2];
if( get_bytes( filename, buf, 2 ) )
if( (buf[0] == 'M' && buf[1] == 'M') ||
(buf[0] == 'I' && buf[1] == 'I') )
return( 1 );
return( 0 );
}
#ifdef HAVE_PNG
int
im_ispng( const char *filename )
{
unsigned char buf[8];
return( get_bytes( filename, buf, 8 ) &&
!png_sig_cmp( buf, 0, 8 ) );
}
#else /*HAVE_PNG*/
int
im_ispng( const char *filename )
{
return( 0 );
}
#endif /*HAVE_PNG*/
#ifdef HAVE_MAGICK
int
im_ismagick( const char *filename )
{
IMAGE *im;
int result;
if( !(im = im_open( "dummy", "p" )) )
return( -1 );
result = im_magick2vips_header( filename, im );
im_clear_error_string();
im_close( im );
return( result == 0 );
}
#else /*HAVE_MAGICK*/
int
im_ismagick( const char *filename )
{
return( 0 );
}
#endif /*HAVE_MAGICK*/
int
im_isppm( const char *filename )
{
unsigned char buf[2];
if( get_bytes( filename, buf, 2 ) )
if( buf[0] == 'P' && (buf[1] >= '1' || buf[1] <= '6') )
return( 1 );
return( 0 );
}
#ifdef HAVE_TIFF
/* Handle TIFF errors here.
*/
static void
vhandle( char *module, char *fmt, ... )
{
va_list ap;
im_errormsg( "TIFF error in \"%s\": ", module );
va_start( ap, fmt );
im_verrormsg( fmt, ap );
va_end( ap );
}
int
im_istifftiled( const char *filename )
{
TIFF *tif;
int tiled;
/* Override the default TIFF error handler.
*/
TIFFSetErrorHandler( (TIFFErrorHandler) vhandle );
#ifdef BINARY_OPEN
if( !(tif = TIFFOpen( filename, "rb" )) ) {
#else /*BINARY_OPEN*/
if( !(tif = TIFFOpen( filename, "r" )) ) {
#endif /*BINARY_OPEN*/
/* Not a TIFF file ... return False.
*/
im_clear_error_string();
return( 0 );
}
tiled = TIFFIsTiled( tif );
TIFFClose( tif );
return( tiled );
}
#else /*HAVE_TIFF*/
int
im_istifftiled( const char *filename )
{
return( 0 );
}
#endif /*HAVE_TIFF*/
int
im_isjpeg( const char *filename )
{
unsigned char buf[2];
if( get_bytes( filename, buf, 2 ) )
if( (int) buf[0] == 0xff && (int) buf[1] == 0xd8 )
return( 1 );
return( 0 );
}
int
im_isvips( const char *filename )
{
unsigned char buf[4];
if( get_bytes( filename, buf, 4 ) ) {
if( buf[0] == 0x08 && buf[1] == 0xf2 &&
buf[2] == 0xa6 && buf[3] == 0xb6 )
/* SPARC-order VIPS image.
*/
return( 1 );
else if( buf[3] == 0x08 && buf[2] == 0xf2 &&
buf[1] == 0xa6 && buf[0] == 0xb6 )
/* INTEL-order VIPS image.
*/
return( 1 );
}
return( 0 );
}
int
im_isexr( const char *filename )
{
unsigned char buf[4];
if( get_bytes( filename, buf, 4 ) )
if( buf[0] == 0x76 && buf[1] == 0x2f &&
buf[2] == 0x31 && buf[3] == 0x01 )
return( 1 );
return( 0 );
}
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/* Test for file exists.
*/
int
im_existsf( const char *name, ... )
{
va_list ap;
char buf1[PATH_MAX];
va_start( ap, name );
(void) im_vsnprintf( buf1, PATH_MAX - 1, name, ap );
va_end( ap );
/* Try that.
*/
if( !access( buf1, R_OK ) )
return( 1 );
return( 0 );
}
/* True if this IMAGE is a disc file of some sort.
*/
int
im_isfile( IMAGE *im )
{
switch( im->dtype ) {
case IM_MMAPIN:
case IM_MMAPINRW:
case IM_OPENOUT:
case IM_OPENIN:
return( 1 );
case IM_PARTIAL:
case IM_SETBUF:
case IM_SETBUF_FOREIGN:
case IM_NONE:
return( 0 );
default:
error_exit( "im_isfile: corrupt IMAGE descriptor" );
/*NOTREACHED*/
return( -1 );
}
}
/* True if this IMAGE is a partial of some sort.
*/
int
im_ispartial( IMAGE *im )
{
switch( im->dtype ) {
case IM_PARTIAL:
return( 1 );
case IM_SETBUF:
case IM_SETBUF_FOREIGN:
case IM_MMAPIN:
case IM_MMAPINRW:
case IM_OPENIN:
case IM_OPENOUT:
case IM_NONE:
return( 0 );
default:
error_exit( "im_ispartial: corrupt IMAGE descriptor" );
/*NOTREACHED*/
return( -1 );
}
}
/* True if an int is a power of two ... 1, 2, 4, 8, 16, 32, etc. Do with just
* integer arithmetic for portability. A previous Nicos version using doubles
* and log/log failed on x86 with rounding problems. Return 0 for not
* power of two, otherwise return the position of the set bit (numbering with
* bit 1 as the lsb).
*/
int
im_ispoweroftwo( int p )
{
int i, n;
/* Count set bits. Could use a LUT, I guess.
*/
for( i = 0, n = 0; p; i++, p >>= 1 )
if( (p & 1) == 1 )
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n++;
/* Should be just one set bit.
*/
if( n == 1 )
/* Return position of bit.
*/
return( i );
else
return( 0 );
}