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package zstd
import (
"bytes"
"errors"
"fmt"
"io/ioutil"
"os"
"testing"
)
var raw []byte
var (
ErrNoPayloadEnv = errors.New("PAYLOAD env was not set")
)
func init() {
var err error
payload := os.Getenv("PAYLOAD")
if len(payload) > 0 {
raw, err = ioutil.ReadFile(payload)
if err != nil {
fmt.Printf("Error opening payload: %s\n", err)
}
}
}
// Test our version of compress bound vs C implementation
func TestCompressBound(t *testing.T) {
tests := []int{0, 1, 2, 10, 456, 15468, 1313, 512, 2147483632}
for _, test := range tests {
if CompressBound(test) != cCompressBound(test) {
t.Fatalf("For %v, results are different: %v (actual) != %v (expected)", test,
CompressBound(test), cCompressBound(test))
}
}
}
// Test error code
func TestErrorCode(t *testing.T) {
tests := make([]int, 211)
for i := 0; i < len(tests); i++ {
tests[i] = i - 105
}
for _, test := range tests {
err := getError(test)
if err == nil && cIsError(test) {
t.Fatalf("C function returned error for %v but ours did not", test)
} else if err != nil && !cIsError(test) {
t.Fatalf("Ours function returned error for %v but C one did not", test)
}
}
}
// Test compression
func TestCompressDecompress(t *testing.T) {
input := []byte("Hello World!")
out, err := Compress(nil, input)
if err != nil {
t.Fatalf("Error while compressing: %v", err)
}
out2 := make([]byte, 1000)
out2, err = Compress(out2, input)
if err != nil {
t.Fatalf("Error while compressing: %v", err)
}
t.Logf("Compressed: %v", out)
rein, err := Decompress(nil, out)
if err != nil {
t.Fatalf("Error while decompressing: %v", err)
}
rein2 := make([]byte, 10)
rein2, err = Decompress(rein2, out2)
if err != nil {
t.Fatalf("Error while decompressing: %v", err)
}
if string(input) != string(rein) {
t.Fatalf("Cannot compress and decompress: %s != %s", input, rein)
}
if string(input) != string(rein2) {
t.Fatalf("Cannot compress and decompress: %s != %s", input, rein)
}
}
func TestEmptySliceCompress(t *testing.T) {
compressed, err := Compress(nil, []byte{})
if err != nil {
t.Fatalf("Error while compressing: %v", err)
}
t.Logf("Compressing empty slice gives 0x%x", compressed)
decompressed, err := Decompress(nil, compressed)
if err != nil {
t.Fatalf("Error while compressing: %v", err)
}
if string(decompressed) != "" {
t.Fatalf("Expected empty slice as decompressed, got %v instead", decompressed)
}
}
func TestEmptySliceDecompress(t *testing.T) {
_, err := Decompress(nil, []byte{})
if err != ErrEmptySlice {
t.Fatalf("Did not get the correct error: %s", err)
}
}
func TestDecompressZeroLengthBuf(t *testing.T) {
input := []byte("Hello World!")
out, err := Compress(nil, input)
if err != nil {
t.Fatalf("Error while compressing: %v", err)
}
buf := make([]byte, 0)
decompressed, err := Decompress(buf, out)
if err != nil {
t.Fatalf("Error while decompressing: %v", err)
}
if res, exp := string(input), string(decompressed); res != exp {
t.Fatalf("expected %s but decompressed to %s", exp, res)
}
}
func TestTooSmall(t *testing.T) {
var long bytes.Buffer
for i := 0; i < 10000; i++ {
long.Write([]byte("Hellow World!"))
}
input := long.Bytes()
out, err := Compress(nil, input)
if err != nil {
t.Fatalf("Error while compressing: %v", err)
}
rein := make([]byte, 1)
// This should switch to the decompression stream to handle too small dst
rein, err = Decompress(rein, out)
if err != nil {
t.Fatalf("Failed decompressing: %s", err)
}
if string(input) != string(rein) {
t.Fatalf("Cannot compress and decompress: %s != %s", input, rein)
}
}
func TestRealPayload(t *testing.T) {
if raw == nil {
t.Skip(ErrNoPayloadEnv)
}
dst, err := Compress(nil, raw)
if err != nil {
t.Fatalf("Failed to compress: %s", err)
}
rein, err := Decompress(nil, dst)
if err != nil {
t.Fatalf("Failed to decompress: %s", err)
}
if string(raw) != string(rein) {
t.Fatalf("compressed/decompressed payloads are not the same (lengths: %v & %v)", len(raw), len(rein))
}
}
func BenchmarkCompression(b *testing.B) {
if raw == nil {
b.Fatal(ErrNoPayloadEnv)
}
dst := make([]byte, CompressBound(len(raw)))
b.SetBytes(int64(len(raw)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, err := Compress(dst, raw)
if err != nil {
b.Fatalf("Failed compressing: %s", err)
}
}
}
func BenchmarkDecompression(b *testing.B) {
if raw == nil {
b.Fatal(ErrNoPayloadEnv)
}
src := make([]byte, len(raw))
dst, err := Compress(nil, raw)
if err != nil {
b.Fatalf("Failed compressing: %s", err)
}
b.Logf("Reduced from %v to %v", len(raw), len(dst))
b.SetBytes(int64(len(raw)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
src2, err := Decompress(src, dst)
if err != nil {
b.Fatalf("Failed decompressing: %s", err)
}
b.StopTimer()
if !bytes.Equal(raw, src2) {
b.Fatalf("Results are not the same: %v != %v", len(raw), len(src2))
}
b.StartTimer()
}
}
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