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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package flate
import (
"testing"
)
func TestForwardCopy(t *testing.T) {
testCases := []struct {
dst0, dst1 int
src0, src1 int
want string
}{
{0, 9, 0, 9, "012345678"},
{0, 5, 4, 9, "45678"},
{4, 9, 0, 5, "01230"},
{1, 6, 3, 8, "34567"},
{3, 8, 1, 6, "12121"},
{0, 9, 3, 6, "345"},
{3, 6, 0, 9, "012"},
{1, 6, 0, 9, "00000"},
{0, 4, 7, 8, "7"},
{0, 1, 6, 8, "6"},
{4, 4, 6, 9, ""},
{2, 8, 6, 6, ""},
{0, 0, 0, 0, ""},
}
for _, tc := range testCases {
b := []byte("0123456789")
dst := b[tc.dst0:tc.dst1]
src := b[tc.src0:tc.src1]
n := forwardCopy(dst, src)
got := string(dst[:n])
if got != tc.want {
t.Errorf("dst=b[%d:%d], src=b[%d:%d]: got %q, want %q",
tc.dst0, tc.dst1, tc.src0, tc.src1, got, tc.want)
}
// Check that the bytes outside of dst[:n] were not modified.
for i, x := range b {
if i >= tc.dst0 && i < tc.dst0+n {
continue
}
if int(x) != '0'+i {
t.Errorf("dst=b[%d:%d], src=b[%d:%d]: copy overrun at b[%d]: got '%c', want '%c'",
tc.dst0, tc.dst1, tc.src0, tc.src1, i, x, '0'+i)
}
}
}
}
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