imagetool.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2013
 *
 * Written by Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com>
 */

#include "imagetool.h"

#include <image.h>

struct image_type_params *imagetool_get_type(int type)
{
	struct image_type_params **curr;
	INIT_SECTION(image_type);

	struct image_type_params **start = __start_image_type;
	struct image_type_params **end = __stop_image_type;

	for (curr = start; curr != end; curr++) {
		if ((*curr)->check_image_type) {
			if (!(*curr)->check_image_type(type))
				return *curr;
		}
	}
	return NULL;
}

static int imagetool_verify_print_header_by_type(
	void *ptr,
	struct stat *sbuf,
	struct image_type_params *tparams,
	struct image_tool_params *params);

int imagetool_verify_print_header(
	void *ptr,
	struct stat *sbuf,
	struct image_type_params *tparams,
	struct image_tool_params *params)
{
	int retval = -1;
	struct image_type_params **curr;
	INIT_SECTION(image_type);

	struct image_type_params **start = __start_image_type;
	struct image_type_params **end = __stop_image_type;

	if (tparams)
		return imagetool_verify_print_header_by_type(ptr, sbuf, tparams, params);

	for (curr = start; curr != end; curr++) {
		/*
		 * Basically every data file can be guessed / verified as gpimage,
		 * so skip autodetection of data file as gpimage as it does not work.
		 */
		if ((*curr)->check_image_type && (*curr)->check_image_type(IH_TYPE_GPIMAGE) == 0)
			continue;
		if ((*curr)->verify_header) {
			retval = (*curr)->verify_header((unsigned char *)ptr,
						     sbuf->st_size, params);

			if (retval == 0) {
				/*
				 * Print the image information if verify is
				 * successful
				 */
				if ((*curr)->print_header) {
					if (!params->quiet)
						(*curr)->print_header(ptr, params);
				} else {
					fprintf(stderr,
						"%s: print_header undefined for %s\n",
						params->cmdname, (*curr)->name);
				}
				break;
			}
		}
	}

	if (retval != 0) {
		fprintf(stderr, "%s: cannot detect image type\n",
			params->cmdname);
	}

	return retval;
}

static int imagetool_verify_print_header_by_type(
	void *ptr,
	struct stat *sbuf,
	struct image_type_params *tparams,
	struct image_tool_params *params)
{
	int retval = -1;

	if (tparams->verify_header) {
		retval = tparams->verify_header((unsigned char *)ptr,
						sbuf->st_size, params);

		if (retval == 0) {
			/*
			 * Print the image information if verify is successful
			 */
			if (tparams->print_header) {
				if (!params->quiet)
					tparams->print_header(ptr, params);
			} else {
				fprintf(stderr,
					"%s: print_header undefined for %s\n",
					params->cmdname, tparams->name);
			}
		} else {
			fprintf(stderr,
				"%s: verify_header failed for %s with exit code %d\n",
				params->cmdname, tparams->name, retval);
		}

	} else {
		fprintf(stderr, "%s: verify_header undefined for %s\n",
			params->cmdname, tparams->name);
	}

	return retval;
}

int imagetool_save_subimage(
	const char *file_name,
	ulong file_data,
	ulong file_len)
{
	int dfd;

	dfd = open(file_name, O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
		   S_IRUSR | S_IWUSR);
	if (dfd < 0) {
		fprintf(stderr, "Can't open \"%s\": %s\n",
			file_name, strerror(errno));
		return -1;
	}

	if (write(dfd, (void *)file_data, file_len) != (ssize_t)file_len) {
		fprintf(stderr, "Write error on \"%s\": %s\n",
			file_name, strerror(errno));
		close(dfd);
		return -1;
	}

	close(dfd);

	return 0;
}

int imagetool_get_filesize(struct image_tool_params *params, const char *fname)
{
	struct stat sbuf;
	int fd;

	fd = open(fname, O_RDONLY | O_BINARY);
	if (fd < 0) {
		fprintf(stderr, "%s: Can't open %s: %s\n",
			params->cmdname, fname, strerror(errno));
		return -1;
	}

	if (fstat(fd, &sbuf) < 0) {
		fprintf(stderr, "%s: Can't stat %s: %s\n",
			params->cmdname, fname, strerror(errno));
		close(fd);
		return -1;
	}
	close(fd);

	return sbuf.st_size;
}

time_t imagetool_get_source_date(
	 const char *cmdname,
	 time_t fallback)
{
	char *source_date_epoch = getenv("SOURCE_DATE_EPOCH");

	if (source_date_epoch == NULL)
		return fallback;

	time_t time = (time_t) strtol(source_date_epoch, NULL, 10);

	if (gmtime(&time) == NULL) {
		fprintf(stderr, "%s: SOURCE_DATE_EPOCH is not valid\n",
			cmdname);
		time = 0;
	}

	return time;
}