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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021 Sungbo Eo <mans0n@gorani.run>
*
* This code is based on mkdhpimg.c and mkzcfw.c
* Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
* Copyright (c) 2016 FUKAUMI Naoki <naobsd@gmail.com>
*
* Checksum algorithm is derived from add_iptime_fw_header.c
* Copyright (C) 2020 Jaehoon You <teslamint@gmail.com>
*/
#include <byteswap.h>
#include <endian.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "cyg_crc.h"
#if !defined(__BYTE_ORDER)
#error "Unknown byte order"
#endif
#if (__BYTE_ORDER == __BIG_ENDIAN)
#define HOST_TO_LE32(x) bswap_32(x)
#elif (__BYTE_ORDER == __LITTLE_ENDIAN)
#define HOST_TO_LE32(x) (x)
#else
#error "Unsupported endianness"
#endif
#define FW_VERSION "00_000"
struct fw_header {
uint8_t model[8];
uint8_t version[8];
uint8_t reserved[32];
uint32_t size;
uint32_t checksum;
} __attribute__ ((packed));
struct board_info {
const char *model;
size_t payload_offset;
};
struct board_info boards[] = {
{ .model = "a6004mx", .payload_offset = 0x800 },
{ .model = "ax2002m", .payload_offset = 0x38 },
{ .model = "ax2004m", .payload_offset = 0x38 },
{ .model = "ax3000m", .payload_offset = 0x38 },
{ .model = "ax3000q", .payload_offset = 0x38 },
{ .model = "ax6000m", .payload_offset = 0x38 },
{ .model = "ax7800m", .payload_offset = 0x38 },
{ .model = "ax8004m", .payload_offset = 0x38 },
{ .model = "ax3kse", .payload_offset = 0x38 },
{ .model = "ax3ksm", .payload_offset = 0x38 },
{ /* sentinel */ }
};
struct board_info *find_board(const char *model)
{
struct board_info *ret = NULL;
struct board_info *board;
for (board = boards; board->model != NULL; board++) {
if (strcmp(model, board->model) == 0) {
ret = board;
break;
}
}
return ret;
}
uint32_t make_checksum(struct fw_header *header, uint8_t *payload, int size)
{
cyg_uint32 checksum;
/* get CRC of header */
checksum = cyg_crc32_accumulate(~0L, header, sizeof(*header));
/* get CRC of payload buffer with header CRC as initial value */
return (uint32_t)cyg_crc32_accumulate(checksum, payload, size);
}
void make_header(struct board_info *board, uint8_t *buffer, size_t img_size)
{
struct fw_header *header = (struct fw_header *)buffer;
uint32_t checksum;
strncpy((char *)header->model, board->model, sizeof(header->model)-1);
strncpy((char *)header->version, FW_VERSION, sizeof(header->version)-1);
header->size = HOST_TO_LE32(img_size);
checksum = make_checksum(header, buffer + board->payload_offset, img_size);
header->checksum = HOST_TO_LE32(checksum);
}
int main(int argc, const char *argv[])
{
const char *model_name, *img_in, *img_out;
struct board_info *board;
int file_in, file_out;
struct stat stat_in;
size_t size_in, size_out;
uint8_t *buffer;
if (argc != 4) {
fprintf(stderr, "Usage: %s <model> <input> <output>\n", argv[0]);
return EXIT_FAILURE;
}
model_name = argv[1];
img_in = argv[2];
img_out = argv[3];
board = find_board(model_name);
if (board == NULL) {
fprintf(stderr, "%s: Not supported model\n", model_name);
return EXIT_FAILURE;
}
if ((file_in = open(img_in, O_RDONLY)) == -1)
err(EXIT_FAILURE, "%s", img_in);
if (fstat(file_in, &stat_in) == -1)
err(EXIT_FAILURE, "%s", img_in);
size_in = stat_in.st_size;
size_out = board->payload_offset + size_in;
if ((buffer = malloc(size_out)) == NULL)
err(EXIT_FAILURE, "malloc");
read(file_in, buffer + board->payload_offset, size_in);
close(file_in);
memset(buffer, 0, board->payload_offset);
make_header(board, buffer, size_in);
if ((file_out = creat(img_out, 0644)) == -1)
err(EXIT_FAILURE, "%s", img_out);
write(file_out, buffer, size_out);
close(file_out);
free(buffer);
return EXIT_SUCCESS;
}
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