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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2025 Coia Prant <coiaprant@gmail.com>
*
* The golang version can be found at:
* <https://gitlab.com/CoiaPrant/mkqdimg>
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <libgen.h>
#include <getopt.h>
#include <errno.h>
#include <endian.h>
#include "sha1.h"
#define HDR_PADDING_BYTE 0x00
#define PADDING_BYTE 0xff
#define MAX_LENGTH 16647168
#define BOARD_ID_LENGTH 8
#define VERSION_LENGTH 8
#define UBOOT_LENGTH 196608
#define HDR_LENGTH 0x00000400
#define HDR_OFF_BOARD_ID 0
#define HDR_OFF_VERSION 8
#define HDR_OFF_UBOOT 16
#define HDR_OFF_FIRMWARE 32
#define HDR_OFF_MAGIC 48
#define HDR_OFF_CHECKSUM 52
#define HDR_OFF_UBOOT_LEN 72
#define HDR_OFF_FIRMWARE_LEN 76
#define HDR_MAGIC 538248722
/*
* Globals
*/
static char *progname;
/*
* Message macros
*/
#define ERR(fmt, ...) do { \
fflush(0); \
fprintf(stderr, "[%s] *** error: " fmt "\n", \
progname, ## __VA_ARGS__); \
} while (0)
#define ERRS(fmt, ...) do { \
int save = errno; \
fflush(0); \
fprintf(stderr, "[%s] *** error: " fmt "\n", \
progname, ## __VA_ARGS__, strerror(save)); \
} while (0)
static void usage(int status)
{
FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
fprintf(stream,
"\n"
"Options:\n"
" -B <board> create image for the board specified with <board>\n"
" -V <version> version string\n"
" -u <file> read uboot image from the file <file>\n"
" -f <file> read firmware image from the file <file>\n"
" -o <file> write output to the file <file>\n"
" -h show this screen\n"
);
exit(status);
}
void writele(unsigned char *buf, size_t offset, uint32_t value)
{
value = htole32(value);
memcpy(buf + offset, &value, sizeof(uint32_t));
}
int main(int argc, char *argv[])
{
int ret = EXIT_FAILURE;
long ulen, flen, buflen = HDR_LENGTH, fspace;
unsigned char *buf;
char *board_id = NULL, *version = NULL, *ufname = NULL, *ffname = NULL, *ofname = NULL;
FILE *out, *uboot = NULL, *firmware = NULL;
progname = basename(argv[0]);
while (1) {
int c;
c = getopt(argc, argv, "B:V:u:f:o:h");
if (c == -1)
break;
switch (c) {
case 'B':
board_id = optarg;
break;
case 'V':
version = optarg;
break;
case 'u':
ufname = optarg;
break;
case 'f':
ffname = optarg;
break;
case 'o':
ofname = optarg;
break;
case 'h':
usage(EXIT_SUCCESS);
break;
default:
usage(EXIT_FAILURE);
break;
}
}
if (board_id == NULL) {
ERR("no board specified");
goto err;
}
if (strlen(board_id) > BOARD_ID_LENGTH) {
ERR("board_id \"%s\" is too long - max length: 8\n",
board_id);
goto err;
}
if (version != NULL && strlen(version) > VERSION_LENGTH) {
ERR("version \"%s\" is too long - max length: 8\n",
version);
goto err;
}
if (ofname == NULL) {
ERR("no output file specified");
goto err;
}
if (ufname != NULL) {
uboot = fopen(ufname, "r");
if (uboot == NULL) {
ERRS("could not open \"%s\" for reading: %s", ufname);
goto err;
}
/* Get uboot length */
fseek(uboot, 0, SEEK_END);
ulen = ftell(uboot);
rewind(uboot);
if (ulen > UBOOT_LENGTH) {
fclose(uboot);
ERR("file \"%s\" is too big - max size: 0x%08d\n",
ufname, UBOOT_LENGTH);
goto err;
}
buflen += UBOOT_LENGTH;
}
if (ffname != NULL) {
firmware = fopen(ffname, "r");
if (firmware == NULL) {
ERRS("could not open \"%s\" for reading: %s", ffname);
goto err;
}
/* Get firmware length */
fseek(firmware, 0, SEEK_END);
flen = ftell(firmware);
rewind(firmware);
fspace = MAX_LENGTH - buflen;
if (flen > fspace) {
ERR("file \"%s\" is too big - max size: 0x%08ld\n",
ffname, fspace);
goto err_close;
}
buflen += flen;
}
/* Allocate and initialize buffer for final image */
buf = malloc(buflen);
if (buf == NULL) {
ERRS("no memory for buffer: %s\n");
goto err_close;
}
memset(buf, HDR_PADDING_BYTE, HDR_LENGTH);
memset(buf + HDR_LENGTH, PADDING_BYTE, buflen - HDR_LENGTH);
/* Write board id */
memcpy(buf + HDR_OFF_BOARD_ID, board_id, strlen(board_id));
/* Write version */
if (version != NULL) {
memcpy(buf + HDR_OFF_VERSION, version, strlen(version));
}
if (uboot != NULL) {
/* Write UBOOT ID */
memcpy(buf + HDR_OFF_UBOOT, "UBOOT", 5);
/* Load U-Boot */
fread(buf + HDR_LENGTH, ulen, 1, uboot);
/* Write U-Boot Length */
writele(buf, HDR_OFF_UBOOT_LEN, UBOOT_LENGTH);
}
if (firmware != NULL) {
/* Write FIRMWARE ID */
memcpy(buf + HDR_OFF_FIRMWARE, "FIRMWARE", 8);
/* Load Firmware */
if (uboot != NULL) {
fread(buf + HDR_LENGTH + UBOOT_LENGTH, flen, 1, firmware);
} else {
fread(buf + HDR_LENGTH, flen, 1, firmware);
}
/* Write Firmware Length */
writele(buf, HDR_OFF_FIRMWARE_LEN, flen);
}
/* Write magic */
writele(buf, HDR_OFF_MAGIC, HDR_MAGIC);
/* Write checksum and static hash */
sha1_csum(buf + HDR_LENGTH, buflen - HDR_LENGTH, buf + HDR_OFF_CHECKSUM);
/* Save finished image */
out = fopen(ofname, "w");
if (out == NULL) {
ERRS("could not open \"%s\" for writing: %s", ofname);
goto err_free;
}
fwrite(buf, buflen, 1, out);
ret = EXIT_SUCCESS;
fclose(out);
err_free:
free(buf);
err_close:
if (uboot != NULL) {
fclose(uboot);
}
if (firmware != NULL) {
fclose(firmware);
}
err:
return ret;
}
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