86 lines
2.3 KiB
Go
86 lines
2.3 KiB
Go
// Copyright 2017 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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package usb
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import (
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"sync"
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"time"
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)
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type fakeTransfer struct {
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// done is the channel that needs to be closed when the transfer has finished.
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done chan struct{}
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// buf is the slice for reading/writing data between the submit() and wait() returning.
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buf []byte
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// status will be returned by wait() on this transfer
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status TransferStatus
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// length is the number of bytes used from the buffer (write) or available
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// in the buffer (read).
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length int
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}
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type fakeLibusb struct {
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libusbIntf
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mu sync.Mutex
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// ts has a map of all allocated transfers, indexed by the pointer of
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// underlying libusbTransfer.
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ts map[*libusbTransfer]*fakeTransfer
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// submitted receives a fakeTransfers when submit() is called.
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submitted chan *fakeTransfer
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}
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func (f *fakeLibusb) alloc(_ *libusbDevHandle, _ uint8, _ TransferType, _ time.Duration, _ int, buf []byte) (*libusbTransfer, error) {
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f.mu.Lock()
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defer f.mu.Unlock()
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t := new(libusbTransfer)
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f.ts[t] = &fakeTransfer{buf: buf}
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return t, nil
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}
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func (f *fakeLibusb) submit(t *libusbTransfer, done chan struct{}) error {
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f.mu.Lock()
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ft := f.ts[t]
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f.mu.Unlock()
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ft.done = done
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f.submitted <- ft
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return nil
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}
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func (f *fakeLibusb) cancel(t *libusbTransfer) error { return nil }
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func (f *fakeLibusb) free(t *libusbTransfer) {
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f.mu.Lock()
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defer f.mu.Unlock()
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delete(f.ts, t)
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}
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func (f *fakeLibusb) data(t *libusbTransfer) (int, TransferStatus) {
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f.mu.Lock()
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defer f.mu.Unlock()
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return f.ts[t].length, f.ts[t].status
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}
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func (f *fakeLibusb) waitForSubmitted() *fakeTransfer {
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return <-f.submitted
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}
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func newFakeLibusb() *fakeLibusb {
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return &fakeLibusb{
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ts: make(map[*libusbTransfer]*fakeTransfer),
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submitted: make(chan *fakeTransfer, 10),
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libusbIntf: libusbImpl{},
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}
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}
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