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diff --git a/lib/libusb/libusb.h b/lib/libusb/libusb.h
--- a/lib/libusb/libusb.h
+++ b/lib/libusb/libusb.h
@@ -236,6 +236,7 @@
LIBUSB_TRANSFER_SHORT_NOT_OK = 1 << 0,
LIBUSB_TRANSFER_FREE_BUFFER = 1 << 1,
LIBUSB_TRANSFER_FREE_TRANSFER = 1 << 2,
+ LIBUSB_TRANSFER_ADD_ZERO_PACKET = 1 << 3,
};
enum libusb_log_level {
diff --git a/lib/libusb/libusb10.c b/lib/libusb/libusb10.c
--- a/lib/libusb/libusb10.c
+++ b/lib/libusb/libusb10.c
@@ -1326,6 +1326,17 @@
}
/* check for end of data */
if (sxfer->rem_len == 0) {
+ if (flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) {
+ uxfer->flags &=
+ ~LIBUSB_TRANSFER_ADD_ZERO_PACKET;
+ libusb20_tr_setup_bulk(pxfer, sxfer->curr_data,
+ 0, uxfer->timeout);
+ libusb20_tr_submit(pxfer);
+ libusb10_submit_transfer_sub(
+ libusb20_tr_get_priv_sc0(pxfer),
+ uxfer->endpoint);
+ break;
+ }
libusb10_complete_transfer(pxfer, sxfer, LIBUSB_TRANSFER_COMPLETED);
break;
}
@@ -1347,7 +1358,8 @@
libusb20_tr_submit(pxfer);
/* check if we can fork another USB transfer */
- if (sxfer->rem_len == 0)
+ if (sxfer->rem_len == 0 &&
+ !(flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET))
libusb10_submit_transfer_sub(libusb20_tr_get_priv_sc0(pxfer), uxfer->endpoint);
break;
@@ -1597,6 +1609,10 @@
pxfer0 = libusb10_get_transfer(uxfer->dev_handle, endpoint, 0);
pxfer1 = libusb10_get_transfer(uxfer->dev_handle, endpoint, 1);
+ if ((uxfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) &&
+ (endpoint & LIBUSB_ENDPOINT_IN))
+ uxfer->flags &= ~LIBUSB_TRANSFER_ADD_ZERO_PACKET;
+
if (pxfer0 == NULL || pxfer1 == NULL) {
err = LIBUSB_ERROR_OTHER;
} else if ((sxfer->entry.tqe_prev != NULL) ||

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