libvips/tools/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
* 27/2/13
* - convert to vips8 API
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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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
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*/
/*
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>
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#include <locale.h>
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#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 gboolean main_option_all = FALSE;
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static GOptionEntry main_option[] = {
{ "all", 'a', 0, G_OPTION_ARG_NONE, &main_option_all,
N_( "show all fields" ), NULL },
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{ "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
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print_error( void )
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{
fprintf( stderr, "%s: %s", g_get_prgname(), vips_error_buffer() );
vips_error_clear();
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}
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static void *
print_field_fn( VipsImage *image, const char *field, GValue *value, void *a )
{
gboolean *many = (gboolean *) a;
const char *extra;
char *str_value;
/* Look for known enums and decode them.
*/
extra = NULL;
if( strcmp( field, "coding" ) == 0 )
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extra = vips_enum_nick(
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VIPS_TYPE_CODING, g_value_get_int( value ) );
else if( strcmp( field, "format" ) == 0 )
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extra = vips_enum_nick(
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VIPS_TYPE_BAND_FORMAT, g_value_get_int( value ) );
else if( strcmp( field, "interpretation" ) == 0 )
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extra = vips_enum_nick(
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VIPS_TYPE_INTERPRETATION, g_value_get_int( value ) );
if( *many )
printf( "%s: ", image->filename );
str_value = g_strdup_value_contents( value );
printf( "%s: %s", field, str_value );
g_free( str_value );
if( extra )
printf( " - %s", extra );
printf( "\n" );
return( NULL );
}
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/* Print header, or parts of header.
*/
static int
print_header( VipsImage *im, gboolean many )
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{
if( !main_option_field ) {
printf( "%s: ", im->filename );
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vips_object_print_summary( VIPS_OBJECT( im ) );
if( main_option_all )
(void) vips_image_map( im, print_field_fn, &many );
}
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else if( strcmp( main_option_field, "getext" ) == 0 ) {
if( vips__has_extension_block( im ) ) {
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void *buf;
int size;
if( !(buf = vips__read_extension_block( im, &size )) )
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return( -1 );
printf( "%s", (char *) buf );
g_free( buf );
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}
}
else if( strcmp( main_option_field, "Hist" ) == 0 )
printf( "%s", vips_image_get_history( im ) );
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else {
char *str;
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if( vips_image_get_as_string( im, main_option_field, &str ) )
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return( -1 );
printf( "%s\n", str );
g_free( str );
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}
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( vips_init( argv[0] ) )
vips_error_exit( "unable to start VIPS" );
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textdomain( GETTEXT_PACKAGE );
setlocale( LC_ALL, "" );
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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, vips_get_option_group() );
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if( !g_option_context_parse( context, &argc, &argv, &error ) ) {
if( error ) {
fprintf( stderr, "%s\n", error->message );
g_error_free( error );
}
vips_error_exit( "try \"%s --help\"", g_get_prgname() );
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}
g_option_context_free( context );
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result = 0;
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for( i = 1; i < argc; i++ ) {
VipsImage *im;
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if( !(im = vips_image_new_from_file( argv[i] )) ) {
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print_error();
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result = 1;
}
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if( im &&
print_header( im, argc > 2 ) ) {
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print_error();
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result = 1;
}
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if( im )
g_object_unref( im );
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}
vips_shutdown();
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return( result );
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}