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// Copyright 2020 The gVisor Authors.
//
// 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 buffer
import (
"bytes"
"strings"
"testing"
"gvisor.dev/gvisor/pkg/safemem"
)
func TestSafemem(t *testing.T) {
const bufferSize = defaultBufferSize
testCases := []struct {
name string
input string
output string
readLen int
op func(*View)
}{
// Basic coverage.
{
name: "short",
input: "010",
output: "010",
},
{
name: "long",
input: "0" + strings.Repeat("1", bufferSize) + "0",
output: "0" + strings.Repeat("1", bufferSize) + "0",
},
{
name: "short-read",
input: "0",
readLen: 100, // > size.
output: "0",
},
{
name: "zero-read",
input: "0",
output: "",
},
{
name: "read-empty",
input: "",
readLen: 1, // > size.
output: "",
},
// Ensure offsets work.
{
name: "offsets-short",
input: "012",
output: "2",
op: func(v *View) {
v.TrimFront(2)
},
},
{
name: "offsets-long0",
input: "0" + strings.Repeat("1", bufferSize) + "0",
output: strings.Repeat("1", bufferSize) + "0",
op: func(v *View) {
v.TrimFront(1)
},
},
{
name: "offsets-long1",
input: "0" + strings.Repeat("1", bufferSize) + "0",
output: strings.Repeat("1", bufferSize-1) + "0",
op: func(v *View) {
v.TrimFront(2)
},
},
{
name: "offsets-long2",
input: "0" + strings.Repeat("1", bufferSize) + "0",
output: "10",
op: func(v *View) {
v.TrimFront(bufferSize)
},
},
// Ensure truncation works.
{
name: "truncate-short",
input: "012",
output: "01",
op: func(v *View) {
v.Truncate(2)
},
},
{
name: "truncate-long0",
input: "0" + strings.Repeat("1", bufferSize) + "0",
output: "0" + strings.Repeat("1", bufferSize),
op: func(v *View) {
v.Truncate(bufferSize + 1)
},
},
{
name: "truncate-long1",
input: "0" + strings.Repeat("1", bufferSize) + "0",
output: "0" + strings.Repeat("1", bufferSize-1),
op: func(v *View) {
v.Truncate(bufferSize)
},
},
{
name: "truncate-long2",
input: "0" + strings.Repeat("1", bufferSize) + "0",
output: "01",
op: func(v *View) {
v.Truncate(2)
},
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
// Construct the new view.
var view View
bs := safemem.BlockSeqOf(safemem.BlockFromSafeSlice([]byte(tc.input)))
n, err := view.WriteFromBlocks(bs)
if err != nil {
t.Errorf("expected err nil, got %v", err)
}
if n != uint64(len(tc.input)) {
t.Errorf("expected %d bytes, got %d", len(tc.input), n)
}
// Run the operation.
if tc.op != nil {
tc.op(&view)
}
// Read and validate.
readLen := tc.readLen
if readLen == 0 {
readLen = len(tc.output) // Default.
}
out := make([]byte, readLen)
bs = safemem.BlockSeqOf(safemem.BlockFromSafeSlice(out))
n, err = view.ReadToBlocks(bs)
if err != nil {
t.Errorf("expected nil, got %v", err)
}
if n != uint64(len(tc.output)) {
t.Errorf("expected %d bytes, got %d", len(tc.output), n)
}
// Ensure the contents are correct.
if !bytes.Equal(out[:n], []byte(tc.output[:n])) {
t.Errorf("contents are wrong: expected %q, got %q", tc.output, string(out))
}
})
}
}
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