[Magick-bugs] problem reading GRAY images in 6.2.4

[Christophe Beauregard]

On Wednesday 17 January 2007 16:53, Christophe Beauregard wrote:
> In a nutshell, it appears that something (recent) is causing ReadImage
> on GRAY (and possibly other) files to try reading from standard input.
> The attached program (hopefully this list doesn't filter attachments?)
> illustrates the problem:

It does, doesn't it? Okay, graybug-256x256 is an arbitrary 8bpp GRAY image, 
65536 bytes. graybug.c is:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <assert.h>
#include <limits.h>

#include <magick/api.h>

/***************************************************************************/
static MagickBooleanType progress_cb(const char * msg,
	const MagickOffsetType offset,
	const MagickSizeType size, void * data
) {
	fprintf( stderr, "progress: %s\n", msg );
}

int main( int ac, char* av[] ) {
	ExceptionInfo exception;
	ImageInfo* image_info = NULL;
	Image* image = NULL;
	FILE* in = NULL;

	fprintf( stderr, "loading %s\n", av[1] );

	if( access(av[1],R_OK) ) {
		perror(av[1]);
		exit(1);
	}

	GetExceptionInfo( &exception );
	image_info = CloneImageInfo( (ImageInfo *) NULL );
	if( image_info == NULL ) goto fail;
	image_info->depth = 8;

	in = fopen(av[1],"r");
	if( in == NULL ) goto fail;
	SetImageInfoFile(image_info, in);

	image_info->progress_monitor = progress_cb;
	image_info->size = AcquireMagickMemory(256);
	if( image_info->size == NULL ) goto fail;
	snprintf(image_info->size,256,"%dx%d", 256,256);

	fprintf( stderr, "image dimensions '%s'\n", image_info->size);
	
	strncpy( image_info->magick, "GRAY", sizeof(image_info->magick) );
	image = ReadImage( image_info, &exception );

	CatchException(&exception);

	fclose(in);
	in = NULL;

	if( image_info ) DestroyImageInfo( image_info );

	fprintf(stderr, "finished loading image %s\n", av[1]);

	if( image ) DestroyImage( image );

	exit(0);

fail:
	if( image ) DestroyImage( image );
	if( image_info ) DestroyImageInfo( image_info );
	fprintf(stderr, "failed to load image %s\n", av[1]);
	exit(1);
}
EOF

c.

-- 
Christophe Beauregard <chris.beauregard at ec.gc.ca>
Informatics Specialist, Software
Chief Information Officer Branch, Trenton
Environment Canada
(613) 965-2762
I telework most Tuesday and Thursdays. Please use e-mail on those days.