[PATCH firmware-utils] mkh3cimg/mkh3cvfs: add image/filesystem tools for H3C devices
Sander Vanheule
sander at svanheule.net
Wed Jul 27 11:11:30 PDT 2022
On Sat, 2022-07-23 at 22:49 +0200, Jan Hoffmann wrote:
> mkh3cimg creates a firmware image. Firmware images for these devices can
> contain multiple files, but this tool is limited to creating images with
> a single application file. In the case of OpenWrt, this is going to
> contain the kernel image. Compressed files are supported by the image
> format, in this case the supplied input file needs to be a 7z archive
> with LZMA compression.
>
> mkh3cvfs creates a VFS filesystem image. The bootloader can only boot
> images from this filesystem which normally spans most of the flash on
> the device. This tool creates a filesystem image containing a single
> file. While the size of the filesystem is hardcoded in the bootloader,
> an image that is only slightly larger than its content is sufficient,
> as long as no write operations are to be performed on it. This allows to
> append further data (i.e. rootfs) after the end of the generated image.
Since these are two different utilities, could you split this into separate
patches? Nearly 800 lines of code is a bit much to review in one go...
Best,
Sander
>
> Signed-off-by: Jan Hoffmann <jan at 3e8.eu>
> ---
> This patch is a prerequisite for HPE 1920 support.
>
> CMakeLists.txt | 2 +
> src/mkh3cimg.c | 366 ++++++++++++++++++++++++++++++++++++++++++
> src/mkh3cvfs.c | 426 +++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 794 insertions(+)
> create mode 100644 src/mkh3cimg.c
> create mode 100644 src/mkh3cvfs.c
>
> diff --git a/CMakeLists.txt b/CMakeLists.txt
> index e6592bccb157..9b70226b8dc1 100644
> --- a/CMakeLists.txt
> +++ b/CMakeLists.txt
> @@ -65,6 +65,8 @@ FW_UTIL(mkdniimg "" "" "")
> FW_UTIL(mkedimaximg "" "" "")
> FW_UTIL(mkfwimage "" "-Wextra -D_FILE_OFFSET_BITS=64" "${ZLIB_LIBRARIES}")
> FW_UTIL(mkfwimage2 "" "" "${ZLIB_LIBRARIES}")
> +FW_UTIL(mkh3cimg "" "" "")
> +FW_UTIL(mkh3cvfs "" "" "")
> FW_UTIL(mkheader_gemtek "" "" "${ZLIB_LIBRARIES}")
> FW_UTIL(mkhilinkfw "" "" "${OPENSSL_CRYPTO_LIBRARIES}")
> FW_UTIL(mkmerakifw src/sha1.c "" "")
> diff --git a/src/mkh3cimg.c b/src/mkh3cimg.c
> new file mode 100644
> index 000000000000..d5660537f196
> --- /dev/null
> +++ b/src/mkh3cimg.c
> @@ -0,0 +1,366 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +#include <stdio.h>
> +#include <string.h>
> +#include <stdlib.h>
> +#include <stdint.h>
> +#include <sys/types.h>
> +#include <unistd.h>
> +#include <byteswap.h>
> +#include <endian.h>
> +#include <getopt.h>
> +
> +
> +#if !defined(__BYTE_ORDER)
> +#error "Unknown byte order"
> +#endif
> +
> +#if __BYTE_ORDER == __BIG_ENDIAN
> +#define cpu_to_be16(x) (x)
> +#define cpu_to_be32(x) (x)
> +#elif __BYTE_ORDER == __LITTLE_ENDIAN
> +#define cpu_to_be16(x) bswap_16(x)
> +#define cpu_to_be32(x) bswap_32(x)
> +#else
> +#error "Unsupported endianness"
> +#endif
> +
> +
> +#define IMAGE_VERSION 1
> +#define FILE_VERSION 1
> +#define FILE_DESCRIPTION "OpenWrt"
> +#define FILE_TYPE_MASK 0x1
> +
> +
> +#define PACKAGE_FLAG 2
> +
> +#define FILE_TYPE_APPLICATION 0x04000000
> +
> +#define VERSION_OFFSET_INVALID 0xffffffff
> +
> +#define COMPRESSION_TYPE_NONE 0xffffffff
> +#define COMPRESSION_TYPE_7Z 0x00000002
> +
> +
> +struct file_header {
> + uint8_t res1[4];
> +
> + uint32_t header_crc;
> +
> + uint32_t file_type;
> + uint32_t version;
> + uint32_t product_id;
> + uint32_t device_id;
> +
> + uint32_t length_unpadded;
> +
> + uint32_t version_offset;
> +
> + uint16_t year;
> + uint8_t month;
> + uint8_t day;
> + uint8_t res2[1];
> + uint8_t hour;
> + uint8_t minute;
> + uint8_t second;
> +
> + uint8_t res3[64];
> +
> + char description[224];
> +
> + uint32_t length;
> +
> + uint32_t file_crc;
> +
> + uint32_t compression_type;
> +} __attribute__ ((packed));
> +
> +struct file_desc {
> + uint32_t file_type;
> + uint32_t offset;
> + uint32_t length;
> + uint32_t file_crc;
> + uint32_t version;
> + uint32_t type_mask;
> +} __attribute__ ((packed));
> +
> +struct image_header {
> + uint32_t version;
> +
> + uint32_t file_count;
> +
> + uint32_t product_id;
> + uint32_t device_id;
> +
> + uint16_t year;
> + uint8_t month;
> + uint8_t day;
> + uint8_t res1[1];
> + uint8_t hour;
> + uint8_t minute;
> + uint8_t second;
> +
> + uint16_t package_crc;
> + uint16_t package_flag;
> +
> + uint32_t length;
> +
> + struct file_desc files[128];
> +
> + /* RSA signature, not required */
> + uint8_t res2[3072];
> +
> + uint32_t header_crc;
> +} __attribute__ ((packed));
> +
> +
> +static void *buf;
> +static size_t buflen;
> +
> +static size_t length_unpadded;
> +static size_t length;
> +
> +
> +static uint32_t crc16_xmodem(char *buf, size_t len) {
> + uint32_t poly = 0x1021;
> + uint32_t crc = 0;
> + char b;
> + int i, j;
> +
> + for (i = 0; i < len; i++) {
> + b = buf[i];
> + crc = crc ^ (b << 8);
> +
> + for (j = 0; j < 8; j++) {
> + crc = crc << 1;
> + if (crc & 0x10000) {
> + crc = (crc ^ poly) & 0xffff;
> + }
> + }
> + }
> +
> + return crc;
> +}
> +
> +static int create_buffer_and_read_file(char *filename) {
> + FILE *f;
> +
> + f = fopen(filename, "r");
> + if (f == NULL) {
> + fprintf(stderr, "failed to open input file\n");
> + goto err;
> + }
> +
> + fseek(f, 0L, SEEK_END);
> + length_unpadded = ftell(f);
> + rewind(f);
> +
> + length = length_unpadded;
> + if (length_unpadded % 8 != 0) {
> + length += 8 - length_unpadded % 8;
> + }
> +
> + buflen = sizeof(struct file_header) + sizeof(struct image_header) +
> length;
> + buf = malloc(buflen);
> + if (!buf) {
> + fprintf(stderr, "failed to allocate buffer\n");
> + goto err_close;
> + }
> +
> + memset(buf, 0, buflen);
> +
> + if (fread(buf + sizeof(struct file_header) + sizeof(struct
> image_header), length_unpadded, 1, f) != 1) {
> + fprintf(stderr, "failed to read input file\n");
> + goto err_free;
> + }
> +
> + fclose(f);
> + return 0;
> +
> +err_free:
> + free(buf);
> +err_close:
> + fclose(f);
> +err:
> + return -1;
> +}
> +
> +static void build_file_header(uint32_t product_id, uint32_t device_id,
> uint32_t compression_type) {
> + struct file_header *header = buf + sizeof(struct image_header);
> + uint32_t crc;
> +
> + header->file_type = cpu_to_be32(FILE_TYPE_APPLICATION);
> +
> + header->version = cpu_to_be32(FILE_VERSION);
> +
> + header->product_id = cpu_to_be32(product_id);
> + header->device_id = cpu_to_be32(device_id);
> +
> + header->length_unpadded = cpu_to_be32(length_unpadded);
> +
> + header->version_offset = cpu_to_be32(VERSION_OFFSET_INVALID);
> +
> + header->year = cpu_to_be16(1970);
> + header->month = 1;
> + header->day = 1;
> + header->hour = 0;
> + header->minute = 0;
> + header->second = 0;
> +
> + snprintf(header->description, sizeof(header->description), "%s",
> FILE_DESCRIPTION);
> +
> + header->length = cpu_to_be32(length);
> +
> + crc = crc16_xmodem(buf + sizeof(struct image_header) + sizeof(struct
> file_header), length);
> + header->file_crc = cpu_to_be32(crc);
> +
> + header->compression_type = cpu_to_be32(compression_type);
> +
> + crc = crc16_xmodem((char *)header + sizeof(header->res1) +
> sizeof(header->header_crc),
> + sizeof(struct file_header) - sizeof(header->res1) -
> sizeof(header->header_crc));
> + header->header_crc = cpu_to_be32(crc);
> +}
> +
> +static void build_image_header(uint32_t product_id, uint32_t device_id) {
> + struct image_header *header = buf;
> + struct file_header *file_header = buf + sizeof(struct image_header);
> + uint32_t crc;
> +
> + header->version = cpu_to_be32(IMAGE_VERSION);
> +
> + header->file_count = cpu_to_be32(1);
> +
> + header->product_id = cpu_to_be32(product_id);
> + header->device_id = cpu_to_be32(device_id);
> +
> + header->year = cpu_to_be16(1970);
> + header->month = 1;
> + header->day = 1;
> + header->hour = 0;
> + header->minute = 0;
> + header->second = 0;
> +
> + crc = crc16_xmodem(buf + sizeof(struct file_header), buflen -
> sizeof(struct file_header));
> + header->package_crc = cpu_to_be16(crc);
> + header->package_flag = cpu_to_be16(PACKAGE_FLAG);
> +
> + header->length = cpu_to_be32(buflen - sizeof(struct image_header));
> +
> + header->files[0].file_type = file_header->file_type;
> + header->files[0].offset = cpu_to_be32(sizeof(struct image_header));
> + header->files[0].length = cpu_to_be32(sizeof(struct file_header) +
> length);
> + header->files[0].file_crc = file_header->file_crc;
> + header->files[0].version = file_header->version;
> + header->files[0].type_mask = cpu_to_be32(FILE_TYPE_MASK);
> +
> + crc = crc16_xmodem((char *)header, sizeof(struct image_header) -
> sizeof(header->header_crc));
> + header->header_crc = cpu_to_be32(crc);
> +}
> +
> +static int write_output_file(char *filename) {
> + int ret = 0;
> + FILE *f;
> +
> + f = fopen(filename, "w");
> + if (f == NULL) {
> + fprintf(stderr, "failed to open output file\n");
> + ret = -1;
> + goto err;
> + }
> +
> + if (fwrite(buf, buflen, 1, f) != 1) {
> + fprintf(stderr, "failed to write output file\n");
> + ret = -1;
> + }
> +
> + fclose(f);
> +
> +err:
> + return ret;
> +}
> +
> +static void usage(char* argv[]) {
> + printf("Usage: %s [OPTIONS...]\n"
> + "\n"
> + "Options:\n"
> + " -p <product id> product id (32-bit unsigned integer)\n"
> + " -d <device id> device id (32-bit unsigned integer)\n"
> + " -c <compression> compression type of the input file (7z or
> none)\n"
> + " (in case of 7z only LZMA compression is
> allowed)\n"
> + " -i <file> input filename\n"
> + " -o <file> output filename\n"
> + , argv[0]);
> +}
> +
> +int main(int argc, char* argv[]) {
> + int ret = EXIT_FAILURE;
> +
> + static uint32_t product_id = 0;
> + static uint32_t device_id = 0;
> + static uint32_t compression_type = COMPRESSION_TYPE_NONE;
> + static char *input_filename = NULL;
> + static char *output_filename = NULL;
> +
> + while ( 1 ) {
> + int c;
> +
> + c = getopt(argc, argv, "p:d:c:i:o:");
> + if (c == -1)
> + break;
> +
> + switch (c) {
> + case 'p':
> + product_id = strtoul(optarg, NULL, 0);
> + break;
> + case 'd':
> + device_id = strtoul(optarg, NULL, 0);
> + break;
> + case 'c':
> + if (strcmp(optarg, "none") == 0) {
> + compression_type = COMPRESSION_TYPE_NONE;
> + } else if (strcmp(optarg, "7z") == 0) {
> + compression_type = COMPRESSION_TYPE_7Z;
> + } else {
> + usage(argv);
> + return EXIT_FAILURE;
> + }
> + break;
> + case 'i':
> + input_filename = optarg;
> + break;
> + case 'o':
> + output_filename = optarg;
> + break;
> + default:
> + usage(argv);
> + goto err;
> + }
> + }
> +
> + if (!product_id || !device_id ||
> + !input_filename || strlen(input_filename) == 0 ||
> + !output_filename || strlen(output_filename) == 0) {
> +
> + usage(argv);
> + goto err;
> + }
> +
> + if (create_buffer_and_read_file(input_filename)) {
> + goto err;
> + }
> +
> + build_file_header(product_id, device_id, compression_type);
> +
> + build_image_header(product_id, device_id);
> +
> + if (write_output_file(output_filename)) {
> + goto err_free;
> + }
> +
> + ret = EXIT_SUCCESS;
> +
> +err_free:
> + free(buf);
> +err:
> + return ret;
> +}
> diff --git a/src/mkh3cvfs.c b/src/mkh3cvfs.c
> new file mode 100644
> index 000000000000..486a1b88a0eb
> --- /dev/null
> +++ b/src/mkh3cvfs.c
> @@ -0,0 +1,426 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +#include <stdio.h>
> +#include <string.h>
> +#include <stdlib.h>
> +#include <stdint.h>
> +#include <sys/types.h>
> +#include <unistd.h>
> +#include <byteswap.h>
> +#include <endian.h>
> +#include <getopt.h>
> +
> +
> +#if !defined(__BYTE_ORDER)
> +#error "Unknown byte order"
> +#endif
> +
> +#if __BYTE_ORDER == __BIG_ENDIAN
> +#define cpu_to_be16(x) (x)
> +#define cpu_to_be32(x) (x)
> +#define be16_to_cpu(x) (x)
> +#define be32_to_cpu(x) (x)
> +#elif __BYTE_ORDER == __LITTLE_ENDIAN
> +#define cpu_to_be16(x) bswap_16(x)
> +#define cpu_to_be32(x) bswap_32(x)
> +#define be16_to_cpu(x) bswap_16(x)
> +#define be32_to_cpu(x) bswap_32(x)
> +#else
> +#error "Unsupported endianness"
> +#endif
> +
> +
> +#define FAT_PTR_FLAGS_GET(x) ((be32_to_cpu(x) & 0xff000000) >> 24)
> +#define FAT_PTR_FLAGS_SET(x, y) (x = cpu_to_be32((be32_to_cpu(x) &
> 0x00ffffff) | ((y & 0x000000ff) << 24)))
> +
> +#define FAT_PTR_VAL_GET(x) (be32_to_cpu(x) & 0x00ffffff)
> +#define FAT_PTR_VAL_SET(x, y) (x = cpu_to_be32((be32_to_cpu(x) & 0xff000000)
> | (y & 0x00ffffff)))
> +
> +
> +struct fat_entry {
> + /* first byte contains flags */
> + uint32_t previous;
> +
> + /* first byte is reserved */
> + uint32_t next;
> +} __attribute__ ((packed));
> +
> +struct file_entry {
> + uint8_t flags;
> +
> + uint8_t res0[5];
> +
> + uint16_t year;
> + uint8_t month;
> + uint8_t day;
> + uint8_t hour;
> + uint8_t minute;
> + uint8_t second;
> +
> + uint8_t res3[3];
> +
> + uint32_t length;
> +
> + uint32_t parent_block;
> + uint16_t parent_index;
> +
> + uint8_t res4[2];
> +
> + uint32_t data_block;
> +
> + char name[96];
> +} __attribute__ ((packed));
> +
> +
> +#define ERASEBLOCK_SIZE 0x10000
> +#define BLOCK_SIZE 0x400
> +
> +#define BLOCKS_PER_ERASEBLOCK (ERASEBLOCK_SIZE / BLOCK_SIZE)
> +#define FILE_ENTRIES_PER_BLOCK (BLOCK_SIZE / sizeof(struct file_entry))
> +
> +
> +#define FLAG_FREE 0x80
> +#define FLAG_VALID 0x40
> +#define FLAG_INVALID 0x20
> +#define FLAG_HIDE 0x10
> +#define FLAG_DIRECTORY 0x02
> +#define FLAG_READONLY 0x01
> +
> +
> +static FILE *f;
> +static size_t file_size = 0;
> +
> +static int dir_block = 1;
> +static int dir_count = 0;
> +
> +static int next_data_block = 2;
> +
> +
> +static inline size_t fat_entry_offset(int block) {
> + return ERASEBLOCK_SIZE * (block / (BLOCKS_PER_ERASEBLOCK-1))
> + + sizeof(struct fat_entry) * (block % (BLOCKS_PER_ERASEBLOCK-
> 1));
> +}
> +
> +static inline size_t block_offset(int block) {
> + return ERASEBLOCK_SIZE * (block / (BLOCKS_PER_ERASEBLOCK-1))
> + + BLOCK_SIZE * (1 + (block % (BLOCKS_PER_ERASEBLOCK-1)));
> +}
> +
> +static int init_eraseblock(size_t offset) {
> + size_t end = offset - (offset % ERASEBLOCK_SIZE) + ERASEBLOCK_SIZE;
> + char *fill = "\xff";
> + int i;
> +
> + while (file_size < end) {
> + if (fseek(f, file_size, SEEK_SET)) {
> + fprintf(stderr, "failed to seek to end\n");
> + return -1;
> + }
> +
> + for (i = 0; i < ERASEBLOCK_SIZE; i++) {
> + if (fwrite(fill, 1, 1, f) != 1) {
> + fprintf(stderr, "failed to write
> eraseblock\n");
> + return -1;
> + }
> + }
> +
> + file_size += ERASEBLOCK_SIZE;
> + }
> +
> + return 0;
> +}
> +
> +static inline void init_fat_entry(struct fat_entry *out) {
> + memset(out, '\xff', sizeof(struct fat_entry));
> +}
> +
> +static int read_fat_entry(struct fat_entry *out, int block) {
> + size_t offset = fat_entry_offset(block);
> +
> + if (init_eraseblock(offset)) {
> + return -1;
> + }
> +
> + if (fseek(f, offset, SEEK_SET)) {
> + fprintf(stderr, "failed to seek to fat entry\n");
> + return -1;
> + }
> +
> + if (fread(out, sizeof(struct fat_entry), 1, f) != 1) {
> + fprintf(stderr, "failed to read fat entry\n");
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +static int write_fat_entry(struct fat_entry *in, int block) {
> + size_t offset = fat_entry_offset(block);
> +
> + if (init_eraseblock(offset)) {
> + return -1;
> + }
> +
> + if (fseek(f, offset, SEEK_SET)) {
> + fprintf(stderr, "failed to seek to fat entry\n");
> + return -1;
> + }
> +
> + if (fwrite(in, sizeof(struct fat_entry), 1, f) != 1) {
> + fprintf(stderr, "failed to write fat entry\n");
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +static inline void init_file_entry(struct file_entry *out) {
> + memset(out, '\xff', sizeof(struct file_entry));
> +}
> +
> +static int write_file_entry(struct file_entry *in, int block, int index) {
> + size_t offset = block_offset(block) + sizeof(struct file_entry) *
> index;
> +
> + if (init_eraseblock(offset)) {
> + return -1;
> + }
> +
> + if (fseek(f, offset, SEEK_SET)) {
> + fprintf(stderr, "failed to seek to file entry\n");
> + return -1;
> + }
> +
> + if (fwrite(in, sizeof(struct file_entry), 1, f) != 1) {
> + fprintf(stderr, "failed to write file entry\n");
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +static int write_block(void *in, size_t len, int block) {
> + size_t offset = block_offset(block);
> +
> + if (init_eraseblock(offset)) {
> + return -1;
> + }
> +
> + if (fseek(f, offset, SEEK_SET)) {
> + fprintf(stderr, "failed to seek to block\n");
> + return -1;
> + }
> +
> + if (fwrite(in, len, 1, f) != 1) {
> + fprintf(stderr, "failed to write block\n");
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +static int create_root_directory() {
> + struct fat_entry fat;
> + struct file_entry file;
> +
> + /* write format flag / FAT entry for block 0 (contains root file
> entry) */
> + init_fat_entry(&fat);
> + fat.previous = cpu_to_be32((ERASEBLOCK_SIZE << 12) | BLOCK_SIZE);
> + if (write_fat_entry(&fat, 0)) {
> + return -1;
> + }
> +
> + /* write root file entry */
> + init_file_entry(&file);
> + file.flags = ~(FLAG_FREE | FLAG_VALID) & 0xff;
> + file.parent_block = cpu_to_be32(0);
> + file.data_block = cpu_to_be32(1);
> + if (write_file_entry(&file, 0, 0)) {
> + return -1;
> + }
> +
> + /* write FAT entry for block 1 (contains first file entries of root
> directory) */
> + init_fat_entry(&fat);
> + FAT_PTR_FLAGS_SET(fat.previous, ~(FLAG_FREE | FLAG_VALID));
> + if (write_fat_entry(&fat, 1)) {
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +static int write_file(char *name, char *path) {
> + int ret = -1;
> + struct fat_entry fat;
> + struct file_entry file;
> + FILE *fin;
> + char buf[BLOCK_SIZE];
> + size_t len;
> + size_t total = 0;
> + int first_data_block = next_data_block;
> + int data_block = 0;
> +
> + fin = fopen(path, "r");
> + if (fin == NULL) {
> + fprintf(stderr, "failed to open input file\n");
> + return ret;
> + }
> +
> + while ((len = fread(buf, 1, BLOCK_SIZE, fin)) != 0 || !data_block) {
> + total += len;
> +
> + /* update next pointer of previous FAT entry */
> + if (data_block) {
> + if (read_fat_entry(&fat, data_block)) {
> + goto err;
> + }
> + FAT_PTR_VAL_SET(fat.next, next_data_block);
> + if (write_fat_entry(&fat, data_block)) {
> + goto err;
> + }
> + }
> +
> + /* write FAT entry for new block */
> + init_fat_entry(&fat);
> + FAT_PTR_FLAGS_SET(fat.previous, ~(FLAG_FREE | FLAG_VALID));
> + if (data_block) {
> + FAT_PTR_VAL_SET(fat.previous, data_block);
> + }
> + if (write_fat_entry(&fat, next_data_block)) {
> + goto err;
> + }
> +
> + /* write data block */
> + if (write_block(buf, len, next_data_block)) {
> + goto err;
> + }
> +
> + data_block = next_data_block;
> + next_data_block++;
> + }
> +
> + /* create new file entries block if necessary */
> + if (dir_count == FILE_ENTRIES_PER_BLOCK) {
> + /* update next pointer of previous FAT entry */
> + if (read_fat_entry(&fat, dir_block)) {
> + goto err;
> + }
> + FAT_PTR_VAL_SET(fat.next, next_data_block);
> + if (write_fat_entry(&fat, dir_block)) {
> + goto err;
> + }
> +
> + /* write FAT entry for new block */
> + init_fat_entry(&fat);
> + FAT_PTR_FLAGS_SET(fat.previous, ~(FLAG_FREE | FLAG_VALID));
> + FAT_PTR_VAL_SET(fat.previous, dir_block);
> + if (write_fat_entry(&fat, next_data_block)) {
> + goto err;
> + }
> +
> + dir_block = next_data_block;
> + dir_count = 0;
> + next_data_block++;
> + }
> +
> + /* write file entry */
> + init_file_entry(&file);
> +
> + file.flags = ~(FLAG_FREE | FLAG_VALID) & 0xff;
> +
> + file.year = cpu_to_be16(1970);
> + file.month = 1;
> + file.day = 1;
> + file.hour = 0;
> + file.minute = 0;
> + file.second = 0;
> +
> + file.length = cpu_to_be32(total);
> +
> + file.parent_block = cpu_to_be32(0);
> + file.parent_index = cpu_to_be16(0);
> +
> + file.data_block = cpu_to_be32(first_data_block);
> +
> + snprintf(file.name, sizeof(file.name), "%s", name);
> +
> + if (write_file_entry(&file, dir_block, dir_count)) {
> + goto err;
> + }
> +
> + dir_count++;
> +
> + ret = 0;
> +err:
> + fclose(fin);
> + return ret;
> +}
> +
> +static void usage(char* argv[]) {
> + printf("Usage: %s [OPTIONS...]\n"
> + "\n"
> + "Options:\n"
> + " -f <filename> filename in image\n"
> + " -i <file> input filename\n"
> + " -o <file> output filename\n"
> + , argv[0]);
> +}
> +
> +int main(int argc, char* argv[]) {
> + int ret = EXIT_FAILURE;
> +
> + static char *filename = NULL;
> + static char *input_filename = NULL;
> + static char *output_filename = NULL;
> +
> + while ( 1 ) {
> + int c;
> +
> + c = getopt(argc, argv, "f:i:o:");
> + if (c == -1)
> + break;
> +
> + switch (c) {
> + case 'f':
> + filename = optarg;
> + break;
> + case 'i':
> + input_filename = optarg;
> + break;
> + case 'o':
> + output_filename = optarg;
> + break;
> + default:
> + usage(argv);
> + goto err;
> + }
> + }
> +
> + if (!filename || strlen(filename) == 0 ||
> + !input_filename || strlen(input_filename) == 0 ||
> + !output_filename || strlen(output_filename) == 0) {
> +
> + usage(argv);
> + goto err;
> + }
> +
> + f = fopen(output_filename, "w+");
> + if (f == NULL) {
> + fprintf(stderr, "failed to open output file\n");
> + goto err;
> + }
> +
> + if (create_root_directory()) {
> + goto err_close;
> + }
> +
> + if (write_file(filename, input_filename)) {
> + goto err_close;
> + }
> +
> + ret = EXIT_SUCCESS;
> +
> +err_close:
> + fclose(f);
> +err:
> + return ret;
> +}
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