libvips/tools/iofuncs/header.c

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/* @(#) Command; reads the header of a Vasari picture file.
* @(#) Usage: header vasari_file
* @(#)
*
* Copyright: Birkbeck College, History of Art Dept, London, VASARI project.
*
* Author: Nicos Dessipris
* Written on: 17/01/1990
* Modified on : 17/04/1990, 2/6/93 K.Martinez
* 16/6/93 JC
* - now calls im_mmapin instead of bizzare bogosity
* 1/6/95 JC
* - extra field argument for testing particular bits of the header
* 29/10/98 JC
* - now uses im_open()
* 24/5/01 JC
* - uses im_tiff2vips_header() etc., for speed
* 7/5/03 JC
* - uses im_open_header()
* 1/8/05
* - uses new header API, for great smallness
* 4/8/05
* - back to plain im_open() now that's lazy enough for us
* 9/9/05
* - display meta fields in save format, if possible
* 20/9/05
* - new field name "getext" reads extension block
* 24/8/06
* - use GOption, loop over args
* 4/1/07
* - use im_history_get()
* 29/2/08
* - don't stop on error
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* 23/7/09
* - ... but do return an error code if anything failed
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* 6/11/09
* - added im_history_get(), im_getexp(), im_printdesc() as wrapped
* functions, so "header" is now obsolete
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*/
/*
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 <string.h>
#include <vips/vips.h>
#include <vips/internal.h>
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#include <vips/debug.h>
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static char *main_option_field = NULL;
static GOptionEntry main_option[] = {
{ "field", 'f', 0, G_OPTION_ARG_STRING, &main_option_field,
N_( "print value of FIELD (\"getext\" reads extension block, "
"\"Hist\" reads image history)" ),
"FIELD" },
{ NULL }
};
/* A non-fatal error. Print the vips error buffer and continue.
*/
static void
print_error( const char *fmt, ... )
{
va_list ap;
va_start( ap, fmt );
vfprintf( stderr, fmt, ap );
va_end( ap );
fprintf( stderr, "\n%s", im_error_buffer() );
im_error_clear();
}
/* Print header, or parts of header.
*/
static int
print_header( IMAGE *im )
{
if( !main_option_field )
im_printdesc( im );
else if( strcmp( main_option_field, "getext" ) == 0 ) {
if( im__has_extension_block( im ) ) {
void *buf;
int size;
if( !(buf = im__read_extension_block( im, &size )) )
return( -1 );
printf( "%s", (char *) buf );
im_free( buf );
}
}
else if( strcmp( main_option_field, "Hist" ) == 0 )
printf( "%s", im_history_get( im ) );
else {
GValue value = { 0 };
GType type;
if( im_header_get( im, main_option_field, &value ) )
return( -1 );
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/* Display the save form, if there is one. This way we display
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* something useful for ICC profiles, xml fields, etc.
*/
type = G_VALUE_TYPE( &value );
if( g_value_type_transformable( type, IM_TYPE_SAVE_STRING ) ) {
GValue save_value = { 0 };
g_value_init( &save_value, IM_TYPE_SAVE_STRING );
if( !g_value_transform( &value, &save_value ) )
return( -1 );
printf( "%s\n", im_save_string_get( &save_value ) );
g_value_unset( &save_value );
}
else {
char *str_value;
str_value = g_strdup_value_contents( &value );
printf( "%s\n", str_value );
g_free( str_value );
}
g_value_unset( &value );
}
return( 0 );
}
int
main( int argc, char *argv[] )
{
GOptionContext *context;
GError *error = NULL;
int i;
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int result;
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if( im_init_world( argv[0] ) )
error_exit( "unable to start VIPS" );
context = g_option_context_new( _( "- print image header" ) );
g_option_context_add_main_entries( context,
main_option, GETTEXT_PACKAGE );
g_option_context_add_group( context, im_get_option_group() );
if( !g_option_context_parse( context, &argc, &argv, &error ) ) {
if( error ) {
fprintf( stderr, "%s\n", error->message );
g_error_free( error );
}
error_exit( "try \"%s --help\"", g_get_prgname() );
}
g_option_context_free( context );
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result = 0;
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for( i = 1; i < argc; i++ ) {
IMAGE *im;
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if( !(im = im_open( argv[i], "r" )) ) {
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print_error( "%s: unable to open", argv[i] );
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result = 1;
}
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if( im && print_header( im ) ) {
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print_error( "%s: unable to print header", argv[i] );
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result = 1;
}
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if( im )
im_close( im );
}
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return( result );
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}