118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
// Copyright 2013 Google Inc. All rights reserved.
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// Copyright 2016 the gousb Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <libusb-1.0/libusb.h>
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#include <stdio.h>
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#include <string.h>
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void print_xfer(struct libusb_transfer *xfer);
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void iso_callback(void *);
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void callback(struct libusb_transfer *xfer) {
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//printf("Callback!\n");
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//print_xfer(xfer);
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iso_callback(xfer->user_data);
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}
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int submit(struct libusb_transfer *xfer) {
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xfer->callback = &callback;
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xfer->status = -1;
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//print_xfer(xfer);
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//printf("Transfer submitted\n");
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/* fake
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strcpy(xfer->buffer, "hello");
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xfer->actual_length = 5;
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callback(xfer);
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return 0; */
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return libusb_submit_transfer(xfer);
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}
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void print_xfer(struct libusb_transfer *xfer) {
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int i;
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printf("Transfer:\n");
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printf(" dev_handle: %p\n", xfer->dev_handle);
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printf(" flags: %08x\n", xfer->flags);
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printf(" endpoint: %x\n", xfer->endpoint);
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printf(" type: %x\n", xfer->type);
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printf(" timeout: %dms\n", xfer->timeout);
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printf(" status: %x\n", xfer->status);
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printf(" length: %d (act: %d)\n", xfer->length, xfer->actual_length);
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printf(" callback: %p\n", xfer->callback);
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printf(" user_data: %p\n", xfer->user_data);
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printf(" buffer: %p\n", xfer->buffer);
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printf(" num_iso_pkts: %d\n", xfer->num_iso_packets);
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printf(" packets:\n");
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for (i = 0; i < xfer->num_iso_packets; i++) {
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printf(" [%04d] %d (act: %d) %x\n", i,
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xfer->iso_packet_desc[i].length,
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xfer->iso_packet_desc[i].actual_length,
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xfer->iso_packet_desc[i].status);
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}
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}
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// extract data from a non-isochronous transfer.
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int extract_data(struct libusb_transfer *xfer, void *raw, int max, unsigned char *status) {
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int i;
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unsigned char *in = xfer->buffer;
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unsigned char *out = raw;
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int len = xfer->actual_length;
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if (len > max) {
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len = max;
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}
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memcpy(out, in, len);
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if (xfer->status != 0 && *status == 0) {
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*status = xfer->status;
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}
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return len;
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}
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// extract data from an isochronous transfer. Very similar to extract_data, but
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// acquires data from xfer->iso_packet_desc array instead of xfer attributes.
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int extract_iso_data(struct libusb_transfer *xfer, void *raw, int max, unsigned char *status) {
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int i;
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int copied = 0;
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unsigned char *in = xfer->buffer;
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unsigned char *out = raw;
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for (i = 0; i < xfer->num_iso_packets; i++) {
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struct libusb_iso_packet_descriptor pkt = xfer->iso_packet_desc[i];
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// Copy the data
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int len = pkt.actual_length;
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if (copied + len > max) {
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len = max - copied;
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}
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memcpy(out, in, len);
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copied += len;
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// Increment offsets
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in += pkt.length;
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out += len;
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if (copied == max) {
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break;
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}
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// Extract first error
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if (pkt.status == 0 || *status != 0) {
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continue;
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}
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*status = pkt.status;
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}
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return copied;
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}
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