[Dfu-util] Patch for activating --upload-size option

Jakub Palider jpalider at gmail.com
Fri Sep 4 23:30:19 UTC 2020


please, review the patch and, if okay, apply it.
It was tested with some basic scenarios for the upload size and
results are backward compatible and work for relevant parameters:

Use expected upload size when reading from device

In order to limit transfer on wires stop transmission when
expected size is reached.

Signed-off-by: Jakub Palider <jpalider at gmail.com>
 src/dfu_load.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/dfu_load.c b/src/dfu_load.c
index 32c71b5..78db9ff 100644
--- a/src/dfu_load.c
+++ b/src/dfu_load.c
@@ -63,6 +63,15 @@ int dfuload_do_upload(struct dfu_if *dif, int xfer_size,

+        /* If option --expected_size/-Z was issued then limit reading
+           size to the requested size and trim anything above that
+           limit (actual bus transfer may slightly exceed this value).
+           Here we also know rc < xfer_size which will stop transfer
+           down the execution path.
+        */
+        if (expected_size && (total_bytes + rc > expected_size))
+            rc = expected_size - total_bytes;
         dfu_file_write_crc(fd, 0, buf, rc);
         total_bytes += rc;



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