pkg/vendor/github.com/ulikunitz/xz/lzma/header2_test.go

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2018-06-17 06:46:58 +00:00
// Copyright 2014-2017 Ulrich Kunitz. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package lzma
import (
"bytes"
"fmt"
"testing"
)
func TestChunkTypeString(t *testing.T) {
tests := [...]struct {
c chunkType
s string
}{
{cEOS, "EOS"},
{cUD, "UD"},
{cU, "U"},
{cL, "L"},
{cLR, "LR"},
{cLRN, "LRN"},
{cLRND, "LRND"},
}
for _, c := range tests {
s := fmt.Sprintf("%v", c.c)
if s != c.s {
t.Errorf("got %s; want %s", s, c.s)
}
}
}
func TestHeaderChunkType(t *testing.T) {
tests := []struct {
h byte
c chunkType
}{
{h: 0, c: cEOS},
{h: 1, c: cUD},
{h: 2, c: cU},
{h: 1<<7 | 0x1f, c: cL},
{h: 1<<7 | 1<<5 | 0x1f, c: cLR},
{h: 1<<7 | 1<<6 | 0x1f, c: cLRN},
{h: 1<<7 | 1<<6 | 1<<5 | 0x1f, c: cLRND},
{h: 1<<7 | 1<<6 | 1<<5, c: cLRND},
}
if _, err := headerChunkType(3); err == nil {
t.Fatalf("headerChunkType(%d) got %v; want %v",
3, err, errHeaderByte)
}
for _, tc := range tests {
c, err := headerChunkType(tc.h)
if err != nil {
t.Fatalf("headerChunkType error %s", err)
}
if c != tc.c {
t.Errorf("got %s; want %s", c, tc.c)
}
}
}
func TestHeaderLen(t *testing.T) {
tests := []struct {
c chunkType
n int
}{
{cEOS, 1}, {cU, 3}, {cUD, 3}, {cL, 5}, {cLR, 5}, {cLRN, 6},
{cLRND, 6},
}
for _, tc := range tests {
n := headerLen(tc.c)
if n != tc.n {
t.Errorf("header length for %s %d; want %d",
tc.c, n, tc.n)
}
}
}
func chunkHeaderSamples(t *testing.T) []chunkHeader {
props := Properties{LC: 3, LP: 0, PB: 2}
headers := make([]chunkHeader, 0, 12)
for c := cEOS; c <= cLRND; c++ {
var h chunkHeader
h.ctype = c
if c >= cUD {
h.uncompressed = 0x0304
}
if c >= cL {
h.compressed = 0x0201
}
if c >= cLRN {
h.props = props
}
headers = append(headers, h)
}
return headers
}
func TestChunkHeaderMarshalling(t *testing.T) {
for _, h := range chunkHeaderSamples(t) {
data, err := h.MarshalBinary()
if err != nil {
t.Fatalf("MarshalBinary for %v error %s", h, err)
}
var g chunkHeader
if err = g.UnmarshalBinary(data); err != nil {
t.Fatalf("UnmarshalBinary error %s", err)
}
if g != h {
t.Fatalf("got %v; want %v", g, h)
}
}
}
func TestReadChunkHeader(t *testing.T) {
for _, h := range chunkHeaderSamples(t) {
data, err := h.MarshalBinary()
if err != nil {
t.Fatalf("MarshalBinary for %v error %s", h, err)
}
r := bytes.NewReader(data)
g, err := readChunkHeader(r)
if err != nil {
t.Fatalf("readChunkHeader for %v error %s", h, err)
}
if *g != h {
t.Fatalf("got %v; want %v", g, h)
}
}
}
func TestReadEOS(t *testing.T) {
var b [1]byte
r := bytes.NewReader(b[:])
h, err := readChunkHeader(r)
if err != nil {
t.Fatalf("readChunkHeader error %s", err)
}
if h.ctype != cEOS {
t.Errorf("ctype got %s; want %s", h.ctype, cEOS)
}
if h.compressed != 0 {
t.Errorf("compressed got %d; want %d", h.compressed, 0)
}
if h.uncompressed != 0 {
t.Errorf("uncompressed got %d; want %d", h.uncompressed, 0)
}
wantProps := Properties{}
if h.props != wantProps {
t.Errorf("props got %v; want %v", h.props, wantProps)
}
}