Subversion Repositories openrisc

// Copyright 2011 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 binary

import (
        "bytes"
        "io"
        "testing"
)

func testConstant(t *testing.T, w uint, max int) {
        buf := make([]byte, MaxVarintLen64)
        n := PutUvarint(buf, 1<<w-1)
        if n != max {
                t.Errorf("MaxVarintLen%d = %d; want %d", w, max, n)
        }
}

func TestConstants(t *testing.T) {
        testConstant(t, 16, MaxVarintLen16)
        testConstant(t, 32, MaxVarintLen32)
        testConstant(t, 64, MaxVarintLen64)
}

func testVarint(t *testing.T, x int64) {
        buf := make([]byte, MaxVarintLen64)
        n := PutVarint(buf, x)
        y, m := Varint(buf[0:n])
        if x != y {
                t.Errorf("Varint(%d): got %d", x, y)
        }
        if n != m {
                t.Errorf("Varint(%d): got n = %d; want %d", x, m, n)
        }

        y, err := ReadVarint(bytes.NewBuffer(buf))
        if err != nil {
                t.Errorf("ReadVarint(%d): %s", x, err)
        }
        if x != y {
                t.Errorf("ReadVarint(%d): got %d", x, y)
        }
}

func testUvarint(t *testing.T, x uint64) {
        buf := make([]byte, MaxVarintLen64)
        n := PutUvarint(buf, x)
        y, m := Uvarint(buf[0:n])
        if x != y {
                t.Errorf("Uvarint(%d): got %d", x, y)
        }
        if n != m {
                t.Errorf("Uvarint(%d): got n = %d; want %d", x, m, n)
        }

        y, err := ReadUvarint(bytes.NewBuffer(buf))
        if err != nil {
                t.Errorf("ReadUvarint(%d): %s", x, err)
        }
        if x != y {
                t.Errorf("ReadUvarint(%d): got %d", x, y)
        }
}

var tests = []int64{
        -1 << 63,
        -1<<63 + 1,
        -1,
        0,
        1,
        2,
        10,
        20,
        63,
        64,
        65,
        127,
        128,
        129,
        255,
        256,
        257,
        1<<63 - 1,
}

func TestVarint(t *testing.T) {
        for _, x := range tests {
                testVarint(t, x)
                testVarint(t, -x)
        }
        for x := int64(0x7); x != 0; x <<= 1 {
                testVarint(t, x)
                testVarint(t, -x)
        }
}

func TestUvarint(t *testing.T) {
        for _, x := range tests {
                testUvarint(t, uint64(x))
        }
        for x := uint64(0x7); x != 0; x <<= 1 {
                testUvarint(t, x)
        }
}

func TestBufferTooSmall(t *testing.T) {
        buf := []byte{0x80, 0x80, 0x80, 0x80}
        for i := 0; i <= len(buf); i++ {
                buf := buf[0:i]
                x, n := Uvarint(buf)
                if x != 0 || n != 0 {
                        t.Errorf("Uvarint(%v): got x = %d, n = %d", buf, x, n)
                }

                x, err := ReadUvarint(bytes.NewBuffer(buf))
                if x != 0 || err != io.EOF {
                        t.Errorf("ReadUvarint(%v): got x = %d, err = %s", buf, x, err)
                }
        }
}

func testOverflow(t *testing.T, buf []byte, n0 int, err0 error) {
        x, n := Uvarint(buf)
        if x != 0 || n != n0 {
                t.Errorf("Uvarint(%v): got x = %d, n = %d; want 0, %d", buf, x, n, n0)
        }

        x, err := ReadUvarint(bytes.NewBuffer(buf))
        if x != 0 || err != err0 {
                t.Errorf("ReadUvarint(%v): got x = %d, err = %s; want 0, %s", buf, x, err, err0)
        }
}

func TestOverflow(t *testing.T) {
        testOverflow(t, []byte{0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x2}, -10, overflow)
        testOverflow(t, []byte{0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x1, 0, 0}, -13, overflow)
}

func TestNonCanonicalZero(t *testing.T) {
        buf := []byte{0x80, 0x80, 0x80, 0}
        x, n := Uvarint(buf)
        if x != 0 || n != 4 {
                t.Errorf("Uvarint(%v): got x = %d, n = %d; want 0, 4", buf, x, n)

        }
}

func BenchmarkPutUvarint32(b *testing.B) {
        buf := make([]byte, MaxVarintLen32)
        b.SetBytes(4)
        for i := 0; i < b.N; i++ {
                for j := uint(0); j < MaxVarintLen32; j++ {
                        PutUvarint(buf, 1<<(j*7))
                }
        }
}

func BenchmarkPutUvarint64(b *testing.B) {
        buf := make([]byte, MaxVarintLen64)
        b.SetBytes(8)
        for i := 0; i < b.N; i++ {
                for j := uint(0); j < MaxVarintLen64; j++ {
                        PutUvarint(buf, 1<<(j*7))
                }
        }
}