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71 lines
1.9 KiB
Go
71 lines
1.9 KiB
Go
/*
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Copyright 2018 The go4 Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package readerutil
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import "testing"
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type trackingReader struct {
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off int
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reads int
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readBytes int
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}
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func (t *trackingReader) Read(p []byte) (n int, err error) {
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t.reads++
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t.readBytes += len(p)
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for len(p) > 0 {
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p[0] = '0' + byte(t.off%10)
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t.off++
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p = p[1:]
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n++
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}
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return
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}
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func TestBufferingReaderAt(t *testing.T) {
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tr := new(trackingReader)
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ra := NewBufferingReaderAt(tr)
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for i, tt := range []struct {
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off int64
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want string
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wantReads int
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wantReadBytes int
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}{
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{off: 0, want: "0123456789", wantReads: 1, wantReadBytes: 10},
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{off: 5, want: "56789", wantReads: 1, wantReadBytes: 10}, // already buffered
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{off: 6, want: "67890", wantReads: 2, wantReadBytes: 11}, // need 1 more byte
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{off: 0, want: "0123456789", wantReads: 2, wantReadBytes: 11}, // already buffered
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} {
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got := make([]byte, len(tt.want))
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n, err := ra.ReadAt(got, tt.off)
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if err != nil || n != len(tt.want) {
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t.Errorf("step %d: ReadAt = %v, %v; want %v, %v", i, n, err, len(tt.want), nil)
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continue
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}
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if string(got) != tt.want {
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t.Errorf("step %d: ReadAt read %q; want %q", i, got, tt.want)
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}
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if tr.reads != tt.wantReads {
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t.Errorf("step %d: num reads = %d; want %d", i, tr.reads, tt.wantReads)
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}
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if tr.readBytes != tt.wantReadBytes {
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t.Errorf("step %d: read bytes = %d; want %d", i, tr.reads, tt.wantReads)
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}
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}
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}
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