/*
 * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <stdint.h>
#include <stdlib.h>
#include <errno.h>
#include <vsprintf.h>
#include <gpxe/image.h>
#include <gpxe/umalloc.h>
#include <usr/fetch.h>
#include <usr/imgmgmt.h>

/** @file
 *
 * Image management
 *
 */

/**
 * Fetch an image
 *
 * @v filename		Filename for image
 * @v name		Name for image, or NULL
 * @ret new_image	Newly created image
 * @ret rc		Return status code
 */
int imgfetch ( const char *filename, const char *name,
	       struct image **new_image ) {
	struct image *image;
	int rc;

	/* Allocate new image */
	image = malloc ( sizeof ( *image ) );
	if ( ! image )
		return -ENOMEM;
	memset ( image, 0, sizeof ( *image ) );

	/* Fill in image name */
	if ( name )
		strncpy ( image->name, name, ( sizeof ( image->name ) - 1 ) );

	/* Fetch the file */
	if ( ( rc = fetch ( filename, &image->data, &image->len ) ) != 0 )
		goto err;

	/* Register the image */
	if ( ( rc = register_image ( image ) ) != 0 )
		goto err;

	*new_image = image;
	return 0;

 err:
	ufree ( image->data );
	free ( image );
	return rc;
}

/**
 * Load an image
 *
 * @v image		Image
 * @ret rc		Return status code
 */
int imgload ( struct image *image ) {
	int rc;

	/* Try to load image */
	if ( ( rc = image_autoload ( image ) ) != 0 )
		return rc;

	/* If we succeed, move the image to the start of the list */
	promote_image ( image );

	return 0;
}

/**
 * Execute an image
 *
 * @v image		Image
 * @ret rc		Return status code
 */
int imgexec ( struct image *image ) {
	return image_exec ( image );
}

/**
 * Identify the first loaded image
 *
 * @ret image		Image, or NULL
 */
struct image * imgautoselect ( void ) {
	struct image *image;

	for_each_image ( image ) {
		if ( image->flags & IMAGE_LOADED )
			return image;
	}

	return NULL;
}

/**
 * Display status of an image
 *
 * @v image		Executable/loadable image
 */
void imgstat ( struct image *image ) {
	printf ( "%s: %zd bytes", image->name, image->len );
	if ( image->type )
		printf ( " [%s]", image->type->name );
	if ( image->flags & IMAGE_LOADED )
		printf ( " [LOADED]" );
	if ( image->cmdline[0] )
		printf ( " \"%s\"", image->cmdline );
	printf ( "\n" );
}

/**
 * Free an image
 *
 * @v image		Executable/loadable image
 */
void imgfree ( struct image *image ) {
	unregister_image ( image );
	ufree ( image->data );
	free ( image );
}