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-rw-r--r--ubi-utils/src/libmtd.c104
1 files changed, 103 insertions, 1 deletions
diff --git a/ubi-utils/src/libmtd.c b/ubi-utils/src/libmtd.c
index 249fa23..011327d 100644
--- a/ubi-utils/src/libmtd.c
+++ b/ubi-utils/src/libmtd.c
@@ -981,7 +981,6 @@ int mtd_write(const struct mtd_dev_info *mtd, int fd, int eb, int offs,
errno = EINVAL;
return -1;
}
-
if (offs % mtd->subpage_size) {
errmsg("write offset %d is not aligned to mtd%d min. I/O size %d",
offs, mtd->dev_num, mtd->subpage_size);
@@ -1009,6 +1008,109 @@ int mtd_write(const struct mtd_dev_info *mtd, int fd, int eb, int offs,
return 0;
}
+int mtd_write_img(const struct mtd_dev_info *mtd, int fd, int eb, int offs,
+ const char *img_name)
+{
+ int tmp, ret, in_fd, len, written = 0;
+ off_t seek;
+ struct stat st;
+ char *buf;
+
+ if (eb < 0 || eb >= mtd->eb_cnt) {
+ errmsg("bad eraseblock number %d, mtd%d has %d eraseblocks",
+ eb, mtd->dev_num, mtd->eb_cnt);
+ errno = EINVAL;
+ return -1;
+ }
+ if (offs < 0 || offs >= mtd->eb_size) {
+ errmsg("bad offset %d, mtd%d eraseblock size is %d",
+ offs, mtd->dev_num, mtd->eb_size);
+ errno = EINVAL;
+ return -1;
+ }
+ if (offs % mtd->subpage_size) {
+ errmsg("write offset %d is not aligned to mtd%d min. I/O size %d",
+ offs, mtd->dev_num, mtd->subpage_size);
+ errno = EINVAL;
+ return -1;
+ }
+
+ in_fd = open(img_name, O_RDONLY);
+ if (in_fd == -1)
+ return sys_errmsg("cannot open %s", img_name);
+
+ if (fstat(in_fd, &st)) {
+ sys_errmsg("cannot stat %s", img_name);
+ goto out_close;
+ }
+
+ len = st.st_size;
+ if (len % mtd->subpage_size) {
+ errmsg("size of \"%s\" is %d byte, which is not aligned to "
+ "mtd%d min. I/O size %d", img_name, len, mtd->dev_num,
+ mtd->subpage_size);
+ errno = EINVAL;
+ goto out_close;
+ }
+ tmp = (offs + len + mtd->eb_size - 1) / mtd->eb_size;
+ if (eb + tmp > mtd->eb_cnt) {
+ errmsg("\"%s\" image size is %d bytes, mtd%d size is %d "
+ "eraseblocks, the image does not fit if we write it "
+ "starting from eraseblock %d, offset %d",
+ img_name, len, mtd->dev_num, mtd->eb_cnt, eb, offs);
+ errno = EINVAL;
+ goto out_close;
+ }
+
+ /* Seek to the beginning of the eraseblock */
+ seek = (off_t)eb * mtd->eb_size + offs;
+ if (lseek(fd, seek, SEEK_SET) != seek) {
+ sys_errmsg("cannot seek mtd%d to offset %llu",
+ mtd->dev_num, (unsigned long long)seek);
+ goto out_close;
+ }
+
+ buf = malloc(mtd->eb_size);
+ if (!buf) {
+ sys_errmsg("cannot allocate %d bytes of memory", mtd->eb_size);
+ goto out_close;
+ }
+
+ while (written < len) {
+ int rd = 0;
+
+ do {
+ ret = read(in_fd, buf, mtd->eb_size - offs - rd);
+ if (ret == -1) {
+ sys_errmsg("cannot read from %s", img_name);
+ goto out_free;
+ }
+ rd += ret;
+ } while (ret && rd < mtd->eb_size - offs);
+
+ ret = write(fd, buf, rd);
+ if (ret != rd) {
+ sys_errmsg("cannot write %d bytes to mtd%d (eraseblock %d, offset %d)",
+ len, mtd->dev_num, eb, offs);
+ goto out_free;
+ }
+
+ offs = 0;
+ eb += 1;
+ written += rd;
+ }
+
+ free(buf);
+ close(in_fd);
+ return 0;
+
+out_free:
+ free(buf);
+out_close:
+ close(in_fd);
+ return -1;
+}
+
int mtd_probe_node(libmtd_t desc, const char *node)
{
struct stat st;