ebml-go/lacer_test.go
2024-09-18 18:10:46 +02:00

187 lines
4.4 KiB
Go

// Copyright 2019 The ebml-go 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 ebml
import (
"bytes"
"io"
"testing"
"git.gammaspectra.live/WeebDataHoarder/ebml-go/internal/errs"
)
func TestLacer(t *testing.T) {
cases := map[string]struct {
newLacer func(io.Writer) Lacer
frames [][]byte
b []byte
err error
}{
"NoLaceEmpty": {
newLacer: NewNoLacer,
frames: [][]byte{},
b: []byte{},
err: nil,
},
"NoLaceTooMany": {
newLacer: NewNoLacer,
frames: make([][]byte, 2),
b: []byte{},
err: ErrTooManyFrames,
},
"Xiph": {
newLacer: NewXiphLacer,
frames: [][]byte{
bytes.Repeat([]byte{0xAA}, 256),
bytes.Repeat([]byte{0xCC}, 16),
bytes.Repeat([]byte{0x55}, 8),
},
b: append(
[]byte{
0x02,
0xFF, 0x01, // 256 bytes
0x10, // 16 bytes
},
bytes.Join(
[][]byte{
bytes.Repeat([]byte{0xAA}, 256),
bytes.Repeat([]byte{0xCC}, 16),
bytes.Repeat([]byte{0x55}, 8)}, []byte{})...),
err: nil,
},
"XiphEmpty": {
newLacer: NewXiphLacer,
frames: [][]byte{},
b: []byte{},
err: nil,
},
"XiphTooLong": {
newLacer: NewXiphLacer,
frames: make([][]byte, 256),
b: nil,
err: ErrTooManyFrames,
},
"Fixed": {
newLacer: NewFixedLacer,
frames: [][]byte{
bytes.Repeat([]byte{0xAA}, 16),
bytes.Repeat([]byte{0xCC}, 16),
bytes.Repeat([]byte{0x55}, 16),
},
b: append(
[]byte{
0x02,
},
bytes.Join(
[][]byte{
bytes.Repeat([]byte{0xAA}, 16),
bytes.Repeat([]byte{0xCC}, 16),
bytes.Repeat([]byte{0x55}, 16),
}, []byte{})...),
err: nil,
},
"FixedEmpty": {
newLacer: NewFixedLacer,
frames: [][]byte{},
b: []byte{},
err: nil,
},
"FixedUneven": {
newLacer: NewFixedLacer,
frames: [][]byte{
bytes.Repeat([]byte{0xAA}, 16),
bytes.Repeat([]byte{0xCC}, 16),
bytes.Repeat([]byte{0x55}, 15),
},
b: nil,
err: ErrUnevenFixedLace,
},
"FixedTooLong": {
newLacer: NewFixedLacer,
frames: make([][]byte, 256),
b: nil,
err: ErrTooManyFrames,
},
"EBML": {
newLacer: NewEBMLLacer,
frames: [][]byte{
bytes.Repeat([]byte{0xAA}, 800),
bytes.Repeat([]byte{0xCC}, 500),
bytes.Repeat([]byte{0x55}, 100),
},
b: append(
[]byte{
0x02,
0x43, 0x20, // 800 bytes
0x5E, 0xD3, // 500 bytes
},
bytes.Join(
[][]byte{
bytes.Repeat([]byte{0xAA}, 800),
bytes.Repeat([]byte{0xCC}, 500),
bytes.Repeat([]byte{0x55}, 100),
}, []byte{})...),
err: nil,
},
"EBMLEmpty": {
newLacer: NewEBMLLacer,
frames: [][]byte{},
b: []byte{},
err: nil,
},
"EBMLTooLong": {
newLacer: NewEBMLLacer,
frames: make([][]byte, 256),
b: nil,
err: ErrTooManyFrames,
},
}
for name, c := range cases {
t.Run(name, func(t *testing.T) {
var buf bytes.Buffer
l := c.newLacer(&buf)
err := l.Write(c.frames)
if !errs.Is(err, c.err) {
t.Fatalf("Expected error: '%v', got: '%v'", c.err, err)
}
if !bytes.Equal(c.b, buf.Bytes()) {
t.Errorf("Expected data: %v, \n got: %v", c.b, buf.Bytes())
}
})
}
}
func TestLacer_WriterError(t *testing.T) {
lacers := map[string]struct {
frames [][]byte
newLacer func(io.Writer) Lacer
n int
}{
"NoLacer": {[][]byte{{0x01, 0x02}}, NewNoLacer, 3},
"XiphLacer": {[][]byte{{0x01}, {0x02}}, NewXiphLacer, 4},
"FixedLacer": {[][]byte{{0x01}, {0x02}}, NewFixedLacer, 3},
"EBMLLacer": {[][]byte{{0x01}, {0x02}}, NewEBMLLacer, 4},
}
for name, c := range lacers {
t.Run(name, func(t *testing.T) {
for l := 0; l < c.n-1; l++ {
lacer := c.newLacer(&limitedDummyWriter{limit: l})
if err := lacer.Write(c.frames); !errs.Is(err, bytes.ErrTooLarge) {
t.Errorf("Expected error against too large data (Writer size limit: %d): '%v', got '%v'", l, bytes.ErrTooLarge, err)
}
}
})
}
}