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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [encoding/] [binary/] [varint_test.go] - Blame information for rev 747

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1 747 jeremybenn 
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package binary
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import (
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        "bytes"
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        "io"
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        "testing"
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)
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func testConstant(t *testing.T, w uint, max int) {
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        buf := make([]byte, MaxVarintLen64)
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        n := PutUvarint(buf, 1<
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        if n != max {
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                t.Errorf("MaxVarintLen%d = %d; want %d", w, max, n)
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        }
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}
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func TestConstants(t *testing.T) {
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        testConstant(t, 16, MaxVarintLen16)
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        testConstant(t, 32, MaxVarintLen32)
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        testConstant(t, 64, MaxVarintLen64)
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}
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func testVarint(t *testing.T, x int64) {
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        buf := make([]byte, MaxVarintLen64)
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        n := PutVarint(buf, x)
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        y, m := Varint(buf[0:n])
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        if x != y {
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                t.Errorf("Varint(%d): got %d", x, y)
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        }
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        if n != m {
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                t.Errorf("Varint(%d): got n = %d; want %d", x, m, n)
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        }
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        y, err := ReadVarint(bytes.NewBuffer(buf))
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        if err != nil {
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                t.Errorf("ReadVarint(%d): %s", x, err)
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        }
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        if x != y {
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                t.Errorf("ReadVarint(%d): got %d", x, y)
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        }
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}
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func testUvarint(t *testing.T, x uint64) {
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        buf := make([]byte, MaxVarintLen64)
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        n := PutUvarint(buf, x)
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        y, m := Uvarint(buf[0:n])
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        if x != y {
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                t.Errorf("Uvarint(%d): got %d", x, y)
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        }
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        if n != m {
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                t.Errorf("Uvarint(%d): got n = %d; want %d", x, m, n)
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        }
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        y, err := ReadUvarint(bytes.NewBuffer(buf))
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        if err != nil {
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                t.Errorf("ReadUvarint(%d): %s", x, err)
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        }
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        if x != y {
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                t.Errorf("ReadUvarint(%d): got %d", x, y)
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        }
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}
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var tests = []int64{
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        -1 << 63,
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        -1<<63 + 1,
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        -1,
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        0,
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        1,
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        2,
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        10,
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        20,
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        63,
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        64,
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        65,
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        127,
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        128,
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        129,
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        255,
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        256,
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        257,
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        1<<63 - 1,
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}
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func TestVarint(t *testing.T) {
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        for _, x := range tests {
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                testVarint(t, x)
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                testVarint(t, -x)
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        }
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        for x := int64(0x7); x != 0; x <<= 1 {
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                testVarint(t, x)
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                testVarint(t, -x)
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        }
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}
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func TestUvarint(t *testing.T) {
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        for _, x := range tests {
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                testUvarint(t, uint64(x))
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        }
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        for x := uint64(0x7); x != 0; x <<= 1 {
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                testUvarint(t, x)
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        }
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}
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func TestBufferTooSmall(t *testing.T) {
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        buf := []byte{0x80, 0x80, 0x80, 0x80}
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        for i := 0; i <= len(buf); i++ {
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                buf := buf[0:i]
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                x, n := Uvarint(buf)
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                if x != 0 || n != 0 {
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                        t.Errorf("Uvarint(%v): got x = %d, n = %d", buf, x, n)
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                }
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                x, err := ReadUvarint(bytes.NewBuffer(buf))
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                if x != 0 || err != io.EOF {
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                        t.Errorf("ReadUvarint(%v): got x = %d, err = %s", buf, x, err)
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                }
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        }
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}
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func testOverflow(t *testing.T, buf []byte, n0 int, err0 error) {
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        x, n := Uvarint(buf)
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        if x != 0 || n != n0 {
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                t.Errorf("Uvarint(%v): got x = %d, n = %d; want 0, %d", buf, x, n, n0)
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        }
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        x, err := ReadUvarint(bytes.NewBuffer(buf))
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        if x != 0 || err != err0 {
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                t.Errorf("ReadUvarint(%v): got x = %d, err = %s; want 0, %s", buf, x, err, err0)
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        }
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}
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func TestOverflow(t *testing.T) {
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        testOverflow(t, []byte{0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x2}, -10, overflow)
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        testOverflow(t, []byte{0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x1, 0, 0}, -13, overflow)
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}
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func TestNonCanonicalZero(t *testing.T) {
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        buf := []byte{0x80, 0x80, 0x80, 0}
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        x, n := Uvarint(buf)
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        if x != 0 || n != 4 {
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                t.Errorf("Uvarint(%v): got x = %d, n = %d; want 0, 4", buf, x, n)
146 
 
147 
        }
148 
}
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150 
func BenchmarkPutUvarint32(b *testing.B) {
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        buf := make([]byte, MaxVarintLen32)
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        b.SetBytes(4)
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        for i := 0; i < b.N; i++ {
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                for j := uint(0); j < MaxVarintLen32; j++ {
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                        PutUvarint(buf, 1<<(j*7))
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                }
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        }
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}
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func BenchmarkPutUvarint64(b *testing.B) {
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        buf := make([]byte, MaxVarintLen64)
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        b.SetBytes(8)
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        for i := 0; i < b.N; i++ {
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                for j := uint(0); j < MaxVarintLen64; j++ {
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                        PutUvarint(buf, 1<<(j*7))
166 
                }
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        }
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}

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