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firmware-utils: bcm4908img: support extracting image data 

It's useful for upgrading cferom, firmware, etc.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2021-04-02 16:31:43 +02:00
parent 6af45b842b
commit 9c039d56a1
1 changed files with 87 additions and 0 deletions
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87
tools/firmware-utils/src/bcm4908img.c
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@ -469,6 +469,86 @@ out:
return err;
}
/**************************************************
* Extract
**************************************************/
static int bcm4908img_extract(int argc, char **argv) {
struct bcm4908img_info info;
const char *pathname = NULL;
uint8_t buf[1024];
const char *type;
size_t offset;
size_t length;
size_t bytes;
FILE *fp;
int c;
int err = 0;
while ((c = getopt(argc, argv, "i:t:")) != -1) {
switch (c) {
case 'i':
pathname = optarg;
break;
case 't':
type = optarg;
break;
}
}
fp = bcm4908img_open(pathname, "r");
if (!fp) {
fprintf(stderr, "Failed to open BCM4908 image\n");
err = -EACCES;
goto err_out;
}
err = bcm4908img_parse(fp, &info);
if (err) {
fprintf(stderr, "Failed to parse BCM4908 image\n");
goto err_close;
}
if (!strcmp(type, "cferom")) {
offset = 0;
length = info.cferom_size;
if (!length) {
err = -ENOENT;
fprintf(stderr, "This BCM4908 image doesn't contain cferom\n");
goto err_close;
}
} else if (!strcmp(type, "firmware")) {
offset = info.vendor_header_size + info.cferom_size;
length = info.file_size - offset - sizeof(struct bcm4908img_tail);
} else {
err = -EINVAL;
fprintf(stderr, "Unsupported extract type: %s\n", type);
goto err_close;
}
if (!length) {
err = -EINVAL;
fprintf(stderr, "No data to extract specified\n");
goto err_close;
}
fseek(fp, offset, SEEK_SET);
while (length && (bytes = fread(buf, 1, bcm4908img_min(sizeof(buf), length), fp)) > 0) {
fwrite(buf, bytes, 1, stdout);
length -= bytes;
}
if (length) {
err = -EIO;
fprintf(stderr, "Failed to read last %zd B of data\n", length);
goto err_close;
}
err_close:
bcm4908img_close(fp);
err_out:
return err;
}
/**************************************************
* Start
**************************************************/
@ -485,6 +565,11 @@ static void usage() {
printf("\t-f file\t\t\t\tadd data from specified file\n");
printf("\t-a alignment\t\t\tpad image with zeros to specified alignment\n");
printf("\t-A offset\t\t\t\tappend zeros until reaching specified offset\n");
printf("\n");
printf("Extracting from a BCM4908 image:\n");
printf("\tbcm4908img extract <options>\n");
printf("\t-i <file>\t\t\t\tinput BCM490 image\n");
printf("\t-t <type>\t\t\t\tone of: cferom, bootfs, rootfs, firmware\n");
}
int main(int argc, char **argv) {
@ -494,6 +579,8 @@ int main(int argc, char **argv) {
return bcm4908img_info(argc, argv);
else if (!strcmp(argv[1], "create"))
return bcm4908img_create(argc, argv);
else if (!strcmp(argv[1], "extract"))
return bcm4908img_extract(argc, argv);
}
usage();