/*
   * Based on mkimage.c.
   *
   * Written by Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include "dumpimage.h"
  #include <image.h>
  #include <version.h>
  
  static void usage(void);

  /* parameters initialized by core will be used by the image type code */
  static struct image_tool_params params = {
  	.type = IH_TYPE_KERNEL,
  };

  /*

   * dumpimage_extract_subimage -

   *
   * It scans all registered image types,
   * verifies image_header for each supported image type
   * if verification is successful, it extracts the desired file,
   * indexed by pflag, from the image
   *
   * returns negative if input image format does not match with any of
   * supported image types
   */

  static int dumpimage_extract_subimage(struct image_type_params *tparams,

  		void *ptr, struct stat *sbuf)

  {
  	int retval = -1;

  
  	if (tparams->verify_header) {
  		retval = tparams->verify_header((unsigned char *)ptr,
  				sbuf->st_size, &params);
  		if (retval != 0)
  			return -1;
  		/*
  		 * Extract the file from the image
  		 * if verify is successful
  		 */

  		if (tparams->extract_subimage) {
  			retval = tparams->extract_subimage(ptr, &params);

  		} else {
  			fprintf(stderr,

  				"%s: extract_subimage undefined for %s
  ",

  				params.cmdname, tparams->name);
  			return -2;

  		}
  	}
  
  	return retval;
  }
  
  int main(int argc, char **argv)
  {
  	int opt;
  	int ifd = -1;
  	struct stat sbuf;
  	char *ptr;
  	int retval = 0;
  	struct image_type_params *tparams = NULL;

  	params.cmdname = *argv;

  	while ((opt = getopt(argc, argv, "li:o:T:p:V")) != -1) {

  		switch (opt) {
  		case 'l':
  			params.lflag = 1;
  			break;
  		case 'i':
  			params.imagefile = optarg;
  			params.iflag = 1;
  			break;
  		case 'o':
  			params.outfile = optarg;
  			break;

  		case 'T':
  			params.type = genimg_get_type_id(optarg);
  			if (params.type < 0) {
  				usage();
  			}
  			break;

  		case 'p':
  			params.pflag = strtoul(optarg, &ptr, 10);
  			if (*ptr) {
  				fprintf(stderr,
  					"%s: invalid file position %s
  ",
  					params.cmdname, *argv);
  				exit(EXIT_FAILURE);
  			}
  			break;
  		case 'V':
  			printf("dumpimage version %s
  ", PLAIN_VERSION);
  			exit(EXIT_SUCCESS);
  		default:
  			usage();

  			break;

  		}
  	}
  
  	if (optind >= argc)
  		usage();
  
  	/* set tparams as per input type_id */

  	tparams = imagetool_get_type(params.type);

  	if (tparams == NULL) {

  		fprintf(stderr, "%s: unsupported type: %s
  ",

  			params.cmdname, genimg_get_type_name(params.type));
  		exit(EXIT_FAILURE);
  	}
  
  	/*
  	 * check the passed arguments parameters meets the requirements
  	 * as per image type to be generated/listed
  	 */
  	if (tparams->check_params) {
  		if (tparams->check_params(&params))
  			usage();
  	}
  
  	if (params.iflag)
  		params.datafile = argv[optind];
  	else
  		params.imagefile = argv[optind];
  	if (!params.outfile)
  		params.outfile = params.datafile;
  
  	ifd = open(params.imagefile, O_RDONLY|O_BINARY);
  	if (ifd < 0) {
  		fprintf(stderr, "%s: Can't open \"%s\": %s
  ",
  			params.cmdname, params.imagefile,
  			strerror(errno));
  		exit(EXIT_FAILURE);
  	}
  
  	if (params.lflag || params.iflag) {
  		if (fstat(ifd, &sbuf) < 0) {
  			fprintf(stderr, "%s: Can't stat \"%s\": %s
  ",
  				params.cmdname, params.imagefile,
  				strerror(errno));
  			exit(EXIT_FAILURE);
  		}

  		if ((uint32_t)sbuf.st_size < tparams->header_size) {

  			fprintf(stderr,
  				"%s: Bad size: \"%s\" is not valid image
  ",
  				params.cmdname, params.imagefile);
  			exit(EXIT_FAILURE);
  		}
  
  		ptr = mmap(0, sbuf.st_size, PROT_READ, MAP_SHARED, ifd, 0);
  		if (ptr == MAP_FAILED) {
  			fprintf(stderr, "%s: Can't read \"%s\": %s
  ",
  				params.cmdname, params.imagefile,
  				strerror(errno));
  			exit(EXIT_FAILURE);
  		}
  
  		/*
  		 * Both calls bellow scan through dumpimage registry for all
  		 * supported image types and verify the input image file
  		 * header for match
  		 */
  		if (params.iflag) {
  			/*
  			 * Extract the data files from within the matched
  			 * image type. Returns the error code if not matched
  			 */

  			retval = dumpimage_extract_subimage(tparams, ptr,

  					&sbuf);

  		} else {
  			/*
  			 * Print the image information for matched image type
  			 * Returns the error code if not matched
  			 */

  			retval = imagetool_verify_print_header(ptr, &sbuf,
  					tparams, &params);

  		}
  
  		(void)munmap((void *)ptr, sbuf.st_size);
  		(void)close(ifd);
  
  		return retval;
  	}
  
  	(void)close(ifd);
  
  	return EXIT_SUCCESS;
  }
  
  static void usage(void)
  {
  	fprintf(stderr, "Usage: %s -l image
  "
  		"          -l ==> list image header information
  ",
  		params.cmdname);
  	fprintf(stderr,

  		"       %s -i image -T type [-p position] [-o outfile] data_file
  "
  		"          -i ==> extract from the 'image' a specific 'data_file'
  "
  		"          -T ==> set image type to 'type'
  "
  		"          -p ==> 'position' (starting at 0) of the 'data_file' inside the 'image'
  ",

  		params.cmdname);
  	fprintf(stderr,
  		"       %s -V ==> print version information and exit
  ",
  		params.cmdname);
  
  	exit(EXIT_FAILURE);
  }