1aaa100bdb
* add alloc/free_transfer_and_buffer. Manages the buffer memory on the C side. * switch libusb.go to use the new alloc/free_transfer_and_buffer. Add a new buffer() call to get access to the allocated buffer as a Go slice. * Fake USB transfer uses the new alloc/free/buffer interface. * Switch to the new libusb.alloc signature, where libusb owns the buffer. * newUSBTransfer now allocates a separate buffer, do a copy on endpoint.transfer. * newUSBTransfer will now allocate it's own buffer. * Enable autodetach in rawread.
101 lines
3.4 KiB
C
101 lines
3.4 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.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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void print_xfer(struct libusb_transfer *xfer);
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void xferCallback(struct libusb_transfer*);
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int submit(struct libusb_transfer *xfer) {
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xfer->callback = (libusb_transfer_cb_fn)(&xferCallback);
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xfer->status = -1;
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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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// compact the data in an isochronous transfer. The contents of individual
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// iso packets are shifted left, so that no gaps are left between them.
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// Status is set to the first non-zero status of an iso packet.
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int gousb_compact_iso_data(struct libusb_transfer *xfer, unsigned char *status) {
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int i;
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int sum = 0;
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unsigned char *in = xfer->buffer;
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unsigned char *out = xfer->buffer;
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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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if (pkt.status != 0) {
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*status = pkt.status;
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break;
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}
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// Copy the data
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int len = pkt.actual_length;
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memmove(out, in, len);
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// Increment offsets
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sum += len;
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in += pkt.length;
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out += len;
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}
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return sum;
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}
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// allocates a libusb transfer and a buffer for packet data.
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struct libusb_transfer *gousb_alloc_transfer_and_buffer(int bufLen, int isoPackets) {
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struct libusb_transfer *xfer = libusb_alloc_transfer(isoPackets);
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if (xfer == NULL) {
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return NULL;
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}
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xfer->buffer = (unsigned char*)malloc(bufLen);
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if (xfer->buffer == NULL) {
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libusb_free_transfer(xfer);
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return NULL;
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}
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xfer->length = bufLen;
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return xfer;
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}
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// frees a libusb transfer and its buffer. The buffer of the given
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// libusb_transfer must have been allocated with alloc_transfer_and_buffer.
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void gousb_free_transfer_and_buffer(struct libusb_transfer *xfer) {
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free(xfer->buffer);
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xfer->length = 0;
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libusb_free_transfer(xfer);
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}
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