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// Copyright 2017 the gousb Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gousb
import (
"context"
"testing"
)
func TestNewTransfer(t *testing.T) {
t.Parallel()
ctx := newContextWithImpl(newFakeLibusb())
defer func() {
if err := ctx.Close(); err != nil {
t.Errorf("Context.Close(): %v", err)
}
}()
for _, tc := range []struct {
desc string
dir EndpointDirection
tt TransferType
maxPkt int
buf int
wantIso int
wantLength int
wantTimeout int
}{
{
desc: "bulk in transfer, 512B packets",
dir: EndpointDirectionIn,
tt: TransferTypeBulk,
maxPkt: 512,
buf: 1024,
wantLength: 512,
},
{
desc: "iso out transfer, 3 * 1024B packets",
dir: EndpointDirectionOut,
tt: TransferTypeIsochronous,
maxPkt: 3 * 1024,
buf: 10000,
wantLength: 9216,
},
{
desc: "iso out transfer, 512B packets",
dir: EndpointDirectionOut,
tt: TransferTypeIsochronous,
maxPkt: 512,
buf: 2048,
wantLength: 2048,
},
} {
xfer, err := newUSBTransfer(ctx, nil, &EndpointDesc{
Number: 2,
Direction: tc.dir,
TransferType: tc.tt,
MaxPacketSize: tc.maxPkt,
}, tc.buf)
if err != nil {
t.Fatalf("newUSBTransfer(): %v", err)
}
defer xfer.free()
if got, want := len(xfer.data()), tc.wantLength; got != want {
t.Errorf("xfer.buf: got %d bytes, want %d", got, want)
}
}
}
func TestTransferProtocol(t *testing.T) {
t.Parallel()
f := newFakeLibusb()
ctx := newContextWithImpl(f)
defer func() {
if err := ctx.Close(); err != nil {
t.Errorf("Context.Close(): %v", err)
}
}()
xfers := make([]*usbTransfer, 2)
var err error
for i := 0; i < 2; i++ {
xfers[i], err = newUSBTransfer(ctx, nil, &EndpointDesc{
Number: 6,
Direction: EndpointDirectionIn,
TransferType: TransferTypeBulk,
MaxPacketSize: 512,
}, 10240)
if err != nil {
t.Fatalf("newUSBTransfer: %v", err)
}
}
partial := make(chan struct{})
go func() {
ft := f.waitForSubmitted(nil)
ft.setData([]byte{1, 2, 3, 4, 5})
ft.setStatus(TransferCompleted)
ft = f.waitForSubmitted(nil)
ft.setData(make([]byte, 99))
ft.setStatus(TransferCompleted)
ft = f.waitForSubmitted(nil)
ft.setData(make([]byte, 123))
close(partial)
}()
xfers[0].submit()
xfers[1].submit()
got, err := xfers[0].wait(context.Background())
if err != nil {
t.Errorf("xfer#0.wait returned error %v, want nil", err)
}
if want := 5; got != want {
t.Errorf("xfer#0.wait returned %d bytes, want %d", got, want)
}
got, err = xfers[1].wait(context.Background())
if err != nil {
t.Errorf("xfer#0.wait returned error %v, want nil", err)
}
if want := 99; got != want {
t.Errorf("xfer#0.wait returned %d bytes, want %d", got, want)
}
xfers[1].submit()
<-partial
xfers[1].cancel()
got, err = xfers[1].wait(context.Background())
if err == nil {
t.Error("xfer#1(resubmitted).wait returned error nil, want non-nil")
}
if want := 123; got != want {
t.Errorf("xfer#1(resubmitted).wait returned %d bytes, want %d", got, want)
}
for _, x := range xfers {
x.cancel()
x.wait(context.Background())
x.free()
}
}
func BenchmarkSubSlice(b *testing.B) {
x := make([]byte, 512)
start, len := 50, 50
b.Run("start:start+len", func(b *testing.B) {
for i := 0; i < b.N; i++ {
y := x
y = y[start : start+len]
}
})
b.Run("[start:][:len]", func(b *testing.B) {
for i := 0; i < b.N; i++ {
y := x
y = y[start:][:len]
}
})
}
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