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|
// Copyright 2015, Joe Tsai. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
package meta
import (
"bytes"
"io"
"math/rand"
"testing"
"github.com/dsnet/compress/internal/errors"
"github.com/dsnet/compress/internal/testutil"
)
// TestWriter tests that the encoded output matches the expected output exactly.
// A failure here does not necessarily mean that the encoder is wrong since
// there are many possible representations. Before changing the test vectors to
// make a test pass, one must verify the new output is correct.
func TestWriter(t *testing.T) {
db := testutil.MustDecodeBitGen
dh := testutil.MustDecodeHex
errFuncs := map[string]func(error) bool{
"IsInvalid": errors.IsInvalid,
}
vectors := []struct {
desc string // Description of the text
input []byte // Test input string
output []byte // Expected output string
final FinalMode // Input final mode
errf string // Name of error checking callback
}{{
desc: "empty meta block (FinalNil)",
input: dh(""),
output: db(`<<<
< (0 10) (00011 00000 1010) (011 000 011 001 000 (000 000)*4 010) 0
> (111 <D7:127) (111 <D7:99) 10 (110 <D2:3) 10
< 0*3 0 1*3
`),
final: FinalNil,
}, {
desc: "empty meta block (FinalMeta)",
input: dh(""),
output: db(`<<<
< (0 10) (00011 00000 1010) (011 000 011 001 000 (000 000)*4 010) 0
> 10 (111 <D7:127) (111 <D7:99) 10 (110 <D2:3)
< 0*3 0 1*3
`),
final: FinalMeta,
}, {
desc: "input string 'a'",
input: []byte("a"),
output: db(`<<<
< (0 10) (00110 00000 1000) (011 000 011 001 000 (000 000)*3 010) 0
> 10 0 10 0 (110 <D2:0) 10 0 (110 <D2:0) 10*2 (111 <D7:127)
(111 <D7:82) 10 (110 <D2:3) (110 <D2:1)
< 0*6 0 1*4
`),
final: FinalMeta,
}, {
desc: "input string 'ab'",
input: []byte("ab"),
output: db(`<<<
< (0 10) (00000 00000 1000) (011 000 011 001 000 (000 000)*3 010) 0
> 10 0*2 10 0*3 10 0 (110 <D2:0) 10*2 0*2 10 0*3 10*2 (111 <D7:127)
(111 <D7:77) 10 (110 <D2:3) 10
< 0*0 0 1*4
`),
final: FinalMeta,
}, {
desc: "input string 'abc'",
input: []byte("abc"),
output: db(`<<<
< (0 10) (00000 00000 0110) (011 000 011 001 000 (000 000)*2 010) 0
> 10 0 10*2 0*3 10 0 (110 <D2:0) 10*2 0*2 10 0*3 10*2 0 10*2 0*3
10*2 (111 <D7:127) (111 <D7:58) 10 (110 <D2:3)*2 (110 <D2:3)
< 0*0 0 1*5
`),
final: FinalMeta,
}, {
desc: "input string 'Hello, world!' with FinalNil",
input: dh("48656c6c6f2c20776f726c6421"),
output: db(`<<<
< (0 10) (00111 00000 0100) (011 000 011 001 000 (000 000)*1 010) 0
> 0*2 10 0 10*2 0 (110 <D2:0) 10 0*2 10 0 10 0 10 0*2 10*2 0*3 10*2
0 10*2 0*3 10*2 0 10*2 0 10 (110 <D2:0) 0 10*2 0*3 10*2 0 10 0
(110 <D2:3) 10 0*2 10*3 0 10*3 0 10 (110 <D2:0) 0 10*2 0*2 10 0*2
10*3 0*3 10*2 0 10*2 0*3 10 0*2 10*2 0 10 0 (110 <D2:0) 10
(111 <D7:124) 10 (110 <D2:3) (110 <D2:2)
< 0*7 0 1*6
`),
final: FinalNil,
}, {
desc: "input string 'Hello, world!' with FinalMeta",
input: dh("48656c6c6f2c20776f726c6421"),
output: db(`<<<
< (0 10) (00110 00000 0100) (011 000 011 001 000 (000 000)*1 010) 0
> 10 0 10 0 10*2 0 (110 <D2:0) 10 0*2 10 0 10 0 10 0*2 10*2 0*3 10*2
0 10*2 0*3 10*2 0 10*2 0 10 (110 <D2:0) 0 10*2 0*3 10*2 0 10 0
(110 <D2:3) 10 0*2 10*3 0 10*3 0 10 (110 <D2:0) 0 10*2 0*2 10 0*2
10*3 0*3 10*2 0 10*2 0*3 10 0*2 10*2 0 10 0 (110 <D2:0) 10
(111 <D7:125) 10 (110 <D2:3) (110 <D2:1)
< 0*6 0 1*6
`),
final: FinalMeta,
}, {
desc: "input string 'Hello, world!' with FinalStream",
input: dh("48656c6c6f2c20776f726c6421"),
output: db(`<<<
< (1 10) (00110 00000 0100) (011 000 011 001 000 (000 000)*1 010) 0
> 10 0 10 0 10*2 0 (110 <D2:0) 10 0*2 10 0 10 0 10 0*2 10*2 0*3 10*2
0 10*2 0*3 10*2 0 10*2 0 10 (110 <D2:0) 0 10*2 0*3 10*2 0 10 0
(110 <D2:3) 10 0*2 10*3 0 10*3 0 10 (110 <D2:0) 0 10*2 0*2 10 0*2
10*3 0*3 10*2 0 10*2 0*3 10 0*2 10*2 0 10 0 (110 <D2:0) 10
(111 <D7:125) 10 (110 <D2:3) (110 <D2:1)
< 0*6 0 1*6
`),
final: FinalStream,
}, {
desc: "input hex-string '00'*4",
input: dh("00000000"),
output: db(`<<<
< (0 10) (00110 00000 1010) (011 000 011 001 000 (000 000)*4 010) 0
> 10 0*3 10 (111 <D7:127) (111 <D7:96) 10 (110 <D2:2)
< 0*6 0 1*3
`),
final: FinalMeta,
}, {
desc: "input hex-string '00'*8",
input: dh("0000000000000000"),
output: db(`<<<
< (0 10) (00011 00000 1010) (011 000 011 001 000 (000 000)*4 010) 0
> 10 0 (110 <D2:0) 10 (111 <D7:127) (111 <D7:95) 10 (110 <D2:2)
< 0*3 0 1*3
`),
final: FinalMeta,
}, {
desc: "input hex-string '00'*16",
input: dh("00000000000000000000000000000000"),
output: db(`<<<
< (0 10) (00011 00000 1010) (011 000 011 001 000 (000 000)*4 010) 0
> 10 0 (110 <D2:1) 10 (111 <D7:127) (111 <D7:94) 10 (110 <D2:2)
< 0*3 0 1*3
`),
final: FinalMeta,
}, {
desc: "input hex-string 'ff'*4",
input: dh("ffffffff"),
output: db(`<<<
< (0 10) (00101 00000 1010) (011 000 011 001 000 (000 000)*4 010) 0
> 10*2 0*2 10 (111 <D7:127) (111 <D7:97) 10 (110 <D2:1)
< 0*5 0 1*3
`),
final: FinalMeta,
}, {
desc: "input hex-string 'ff'*8",
input: dh("ffffffffffffffff"),
output: db(`<<<
< (0 10) (00100 00000 1010) (011 000 011 001 000 (000 000)*4 010) 0
> 10*2 0*3 10 (111 <D7:127) (111 <D7:96) 10 (110 <D2:1)
< 0*4 0 1*3
`),
final: FinalMeta,
}, {
desc: "input hex-string 'ff'*16",
input: dh("ffffffffffffffffffffffffffffffff"),
output: db(`<<<
< (0 10) (00001 00000 1010) (011 000 011 001 000 (000 000)*4 010) 0
> 10*2 0 (110 <D2:0) 10 (111 <D7:127) (111 <D7:95) 10 (110 <D2:1)
< 0*1 0 1*3
`),
final: FinalMeta,
}, {
desc: "the random hex-string '911fe47084a4668b'",
input: dh("911fe47084a4668b"),
output: db(`<<<
< (0 10) (00100 00000 0100) (011 000 011 001 000 (000 000)*1 010) 0
> 10 0 (110 <D2:0) 10 0 10 0*3 10 0*2 10 (110 <D2:2) 0 (110 <D2:1)
10 0*2 10*3 0 (110 <D2:0) 10*3 0*3 10 0 (110 <D2:0) 10 0*2 10 0*2
10 0 10 0 10*2 0*2 10*2 0 10*2 0 10 0*3 10 (111 <D7:127)
(111 <D7:2) 10 (110 <D2:3)*5 (110 <D2:0)
< 0*4 0 1*6
`),
final: FinalMeta,
}, {
desc: "the random hex-string 'de9fa94cb16f40fc'",
input: dh("de9fa94cb16f40fc"),
output: db(`<<<
< (0 10) (00001 00000 0100) (011 000 011 001 000 (000 000)*1 010) 0
> 10*2 0*3 10 0 10 0 (110 <D2:0) 10 0 (110 <D2:3) 10*2 0*2 10*2 0 10
0 10 0 10*2 0*2 10*2 0 10 0 10*3 0*2 10 0 (110 <D2:1) 10 0*2 10
(110 <D2:3) 0 10*3 (111 <D7:127) (111 <D7:9) 10 (110 <D2:3)*5 10*2
< 0*1 0 1*6
`),
final: FinalMeta,
}, {
desc: "input hex-string '55'*22",
input: dh("55555555555555555555555555555555555555555555"),
output: db(`<<<
< (1 10) (00000 00000 0010) (011 000 011 001 000 (000 000)*0 010) 0
> 10 0*2 10*2 0 10*2 (0 10)*87 (111 <D7:27) 10 (110 <D2:3)*5 (110 <D2:2)
< 0*0 0 1*7
`),
final: FinalStream,
}, {
desc: "input hex-string '55'*23",
input: dh("5555555555555555555555555555555555555555555555"),
output: db(`<<<
< (0 10) (00000 00000 0010) (011 000 011 001 000 (000 000)*0 010) 0
> 10 0 10*3 0 10*2 (0 10)*91 (111 <D7:24) 10 (110 <D2:3)*5
< 0*0 0 1*7
`),
final: FinalMeta,
}, {
desc: "input hex-string '55'*24",
input: dh("555555555555555555555555555555555555555555555555"),
output: db(`<<<
< (0 10) (00111 00000 0010) (011 000 011 001 000 010)
> 0 (110 <D2:2) 10*3 (0 10)*95 (111 <D7:17) 10 (110 <D2:3)*4 (110 <D2:2)
< 0*7 0 1*7
`),
final: FinalNil,
}, {
desc: "input hex-string '55'*25",
input: dh("55555555555555555555555555555555555555555555555555"),
output: db(`<<<
< (1 10) (00110 00000 0010) (011 000 011 001 000 010)
> 0 10 0 10 0*2 10*3 (0 10)*99 (111 <D7:15) 10 (110 <D2:3)*3 (110 <D2:2)
< 0*6 0 1*7
`),
final: FinalStream,
}, {
desc: "input hex-string '55'*26",
input: dh("5555555555555555555555555555555555555555555555555555"),
output: db(`<<<
< (0 10) (00101 00000 0010) (011 000 011 001 000 010)
> 0 10 0*2 10 0 10*3 (0 10)*103 (111 <D7:11) 10 (110 <D2:3)*3 10
< 0*5 0 1*7
`),
final: FinalMeta,
}, {
desc: "input hex-string '55'*27",
input: dh("555555555555555555555555555555555555555555555555555555"),
output: db(`<<<
< (0 10) (00011 00000 0010) (011 000 011 001 000 010)
> 0*3 10*2 0 10*3 (0 10)*107 (111 <D7:7) 10 (110 <D2:3)*2 (110 <D2:0)
< 0*3 0 1*7
`),
final: FinalNil,
}, {
desc: "input hex-string '55'*28",
input: dh("55555555555555555555555555555555555555555555555555555555"),
output: db(`<<<
< (1 10) (00101 00000 0010) (011 000 011 001 000 010)
> 0 10 0*3 10 (110 <D2:0) (0 10)*111 (111 <D7:3) 10 (110 <D2:3) (110 <D2:2)
< 0*5 0 1*7
`),
final: FinalStream,
}, {
desc: "input hex-string '55'*29",
input: dh("5555555555555555555555555555555555555555555555555555555555"),
output: db(`<<<
< (0 10) (00101 00000 0010) (011 000 011 001 000 010)
> 0 10 0 10 0 10 (110 <D2:0) (0 10)*115 (111 <D7:0) 10 (110 <D2:3)
< 0*5 0 1*7
`),
final: FinalMeta,
}, {
desc: "input hex-string '55'*30",
input: dh("555555555555555555555555555555555555555555555555555555555555"),
output: db(`<<<
< (0 10) (00110 00000 0010) (011 000 011 001 000 010)
> 0 (110 <D2:0) 10 (110 <D2:1) (0 10)*119 0 (110 <D2:2) 10 (110 <D2:0)
< 0*6 0 1*7
`),
final: FinalNil,
}, {
desc: "input hex-string '55'*31",
input: dh("55555555555555555555555555555555555555555555555555555555555555"),
final: FinalStream,
errf: "IsInvalid",
}, {
desc: "input hex-string '55'*32",
input: dh("5555555555555555555555555555555555555555555555555555555555555555"),
final: FinalMeta,
errf: "IsInvalid",
}, {
desc: "input hex-string '73de76bebcf69d5fed3fb3cee87bacfd7de876facffedf'",
input: dh("73de76bebcf69d5fed3fb3cee87bacfd7de876facffedf"),
output: db(`<<<
< (0 10) (00010 00000 0100) (011 000 011 001 000 (000 000) 010)
> 0*2 10 (110 <D2:0) 0 10 0*2 10*2 0*3 10*2 0 (110 <D2:0) 10 0*2 10
0*2 10 0*3 10*2 0 (110 <D2:1) 10 0 10*2 0 (110 <D2:0) 10 0 10 0*2
10 0 (110 <D2:1) 10 0*3 10*2 0 (110 <D2:2) 10 0 10 0 10 0*2 10 0
(110 <D2:3) 0*2 10*2 0*2 10*2 0*2 10 0 10 0*3 10*2 0*2 10*3 0 10 0
(110 <D2:1) 10 0 (110 <D2:0) 10*3 0*2 10 0 10 0*2 10 0 (110 <D2:3)
10 0 (110 <D2:1) 10 (110 <D2:0) 0 10 0*3 10 0*2 10 0*3 10*2 0 10 0
(110 <D2:3) 0*2 10*2 0*2 10 (111 <D7:1) 10 (111 <D7:53) 10*3
< 0*2 0 1*6
`),
final: FinalNil,
}, {
desc: "input hex-string '73de76bebcf69d5fed3fb3cee87bacfd7de876facffede'",
input: dh("73de76bebcf69d5fed3fb3cee87bacfd7de876facffede"),
final: FinalStream,
errf: "IsInvalid",
}, {
desc: "input hex-string 'def773bfab15d257ffffffbbafdf3fef6e1fefd6e75ffffff6fefcff67d9'",
input: dh("def773bfab15d257ffffffbbafdf3fef6e1fefd6e75ffffff6fefcff67d9"),
output: db(`<<<
< (0 10) (00111 00000 0100) (011 000 011 001 000 (000 000) 010)
> 0 10*2 0 10 (110 <D2:1) 0 (110 <D2:0) 10 0 (110 <D2:1) 10 0
(110 <D2:2) 10*2 0*3 10 0 (110 <D2:2) 10 0*3 10 0 10 0 10 0*2 10 0
10 0 10 (110 <D2:0) 0 10*2 0 10 0 (110 <D2:1) 10 0 10 0 10
(111 <D7:15) 10 0*3 10 0 (110 <D2:1) 10 0 10 0 (110 <D2:2) 10 0
(110 <D2:3) 0 10*2 0 (110 <D2:0) 10 0*3 10 0*3 10 0*2 10 0
(110 <D2:1) 10*3 0 (110 <D2:0) 10 0*3 10 0*2 10 0 10 0 (110 <D2:1)
10*2 0 (110 <D2:3) 0 10 0 10 (111 <D7:5) 10 0*2 10 0 (110 <D2:0)
10 0 (110 <D2:3) 10*2 (111 <D7:6) 10*2 0*2 10 0 10*2 0*2 10 0
(110 <D2:3) 0 10*3
< 0*7 0 1*6
`),
final: FinalMeta,
}, {
desc: "input hex-string 'dff773bfab15d257ffffffbbafdf3fef6e1fefd6e75ffffff6fefcff67d9'",
input: dh("dff773bfab15d257ffffffbbafdf3fef6e1fefd6e75ffffff6fefcff67d9"),
final: FinalMeta,
errf: "IsInvalid",
}}
for i, v := range vectors {
var b bytes.Buffer
mw := NewWriter(&b)
mw.bufCnt = copy(mw.buf[:], v.input)
for _, b := range v.input {
b0s, b1s := numBits(b)
mw.buf0s, mw.buf1s = b0s+mw.buf0s, b1s+mw.buf1s
}
err := mw.encodeBlock(v.final)
output := b.Bytes()
if got, want, ok := testutil.BytesCompare(output, v.output); !ok {
t.Errorf("test %d (%s), mismatching data:\ngot %s\nwant %s", i, v.desc, got, want)
}
if len(output) != int(mw.OutputOffset) {
t.Errorf("test %d (%s), mismatching offset: got %d, want %d", i, v.desc, len(output), mw.OutputOffset)
}
if v.errf != "" && !errFuncs[v.errf](err) {
t.Errorf("test %d (%s), mismatching error:\ngot %v\nwant %s(got) == true", i, v.desc, err, v.errf)
} else if v.errf == "" && err != nil {
t.Errorf("test %d (%s), unexpected error: got %v", i, v.desc, err)
}
}
}
type faultyWriter struct{}
func (faultyWriter) Write([]byte) (int, error) { return 0, io.ErrShortWrite }
func TestWriterReset(t *testing.T) {
bb := new(bytes.Buffer)
mw := NewWriter(bb)
buf := make([]byte, 512)
// Test Writer for idempotent Close.
if err := mw.Close(); err != nil {
t.Errorf("unexpected error, Close() = %v", err)
}
if err := mw.Close(); err != nil {
t.Errorf("unexpected error, Close() = %v", err)
}
if _, err := mw.Write(buf); err != errClosed {
t.Errorf("unexpected error, Write(...) = %v, want %v", err, errClosed)
}
// Test Writer with faulty writer.
mw.Reset(faultyWriter{})
if _, err := mw.Write(buf); err != io.ErrShortWrite {
t.Errorf("unexpected error, Write(...) = %v, want %v", err, io.ErrShortWrite)
}
if err := mw.Close(); err != io.ErrShortWrite {
t.Errorf("unexpected error, Close() = %v, want %v", err, io.ErrShortWrite)
}
// Test Writer in normal use.
bb.Reset()
mw.Reset(bb)
data := []byte("The quick brown fox jumped over the lazy dog.")
cnt, err := mw.Write(data)
if err != nil {
t.Errorf("unexpected error, Write(...) = %v", err)
}
if cnt != len(data) {
t.Errorf("write count mismatch, got %d, want %d", cnt, len(data))
}
if err := mw.Close(); err != nil {
t.Errorf("unexpected error, Close() = %v", err)
}
if mw.InputOffset != int64(len(data)) {
t.Errorf("input offset mismatch, got %d, want %d", mw.InputOffset, len(data))
}
if mw.OutputOffset != int64(bb.Len()) {
t.Errorf("output offset mismatch, got %d, want %d", mw.OutputOffset, bb.Len())
}
}
func BenchmarkWriter(b *testing.B) {
data := make([]byte, 1<<16)
rand.Read(data)
rd := new(bytes.Reader)
bb := new(bytes.Buffer)
mw := new(Writer)
b.ReportAllocs()
b.SetBytes(int64(len(data)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
rd.Reset(data)
bb.Reset()
mw.Reset(bb)
cnt, err := io.Copy(mw, rd)
if cnt != int64(len(data)) || err != nil {
b.Fatalf("Copy() = (%d, %v), want (%d, nil)", cnt, err, len(data))
}
if err := mw.Close(); err != nil {
b.Fatalf("Close() = %v, want nil", err)
}
}
}
|
