| // Copyright 2022 The Wuffs Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| // |
| // SPDX-License-Identifier: Apache-2.0 OR MIT |
| |
| package litonlylzma |
| |
| import ( |
| "bytes" |
| "os" |
| "os/exec" |
| "testing" |
| ) |
| |
| const ( |
| oneThousand0x00s = "oneThousand0x00s" |
| oneThousand0xFFs = "oneThousand0xFFs" |
| ) |
| |
| func testRoundTrip(tt *testing.T, filename string) { |
| original := []byte(nil) |
| switch filename { |
| case oneThousand0x00s: |
| original = make([]byte, 1000) |
| case oneThousand0xFFs: |
| original = make([]byte, 1000) |
| for i := range original { |
| original[i] = 0xFF |
| } |
| default: |
| o, err := os.ReadFile("../../test/data/" + filename) |
| if err != nil { |
| tt.Fatalf("ReadFile: %v", err) |
| } |
| original = o |
| } |
| |
| fileFormats := [...]FileFormat{ |
| FileFormatLZMA, |
| FileFormatXz, |
| } |
| |
| for _, f := range fileFormats { |
| compressed, err := f.Encode(nil, original) |
| if err != nil { |
| tt.Fatalf("%v.Encode: %v", f, err) |
| } |
| recovered, _, err := f.Decode(nil, compressed) |
| if err != nil { |
| tt.Fatalf("%v.Decode: %v", f, err) |
| } |
| if !bytes.Equal(original, recovered) { |
| tt.Fatalf("%v: round trip produced different bytes", f) |
| } |
| } |
| } |
| |
| func TestRoundTrip0Bytes(tt *testing.T) { testRoundTrip(tt, "0.bytes") } |
| func TestRoundTripArchiveTar(tt *testing.T) { testRoundTrip(tt, "archive.tar") } |
| func TestRoundTripOneThousand0x00s(tt *testing.T) { testRoundTrip(tt, oneThousand0x00s) } |
| func TestRoundTripOneThousand0xFFs(tt *testing.T) { testRoundTrip(tt, oneThousand0xFFs) } |
| func TestRoundTripPiTxt(tt *testing.T) { testRoundTrip(tt, "pi.txt") } |
| func TestRoundTripRomeoTxt(tt *testing.T) { testRoundTrip(tt, "romeo.txt") } |
| |
| func TestUsrBinFoocatCompat(tt *testing.T) { |
| // Set "allowTestsToExecOtherPrograms = true" for more test coverage, |
| // checking compatibility with third-party decompression tools that are |
| // often available (at a well known location) on Linux. |
| const allowTestsToExecOtherPrograms = false |
| if !allowTestsToExecOtherPrograms { |
| tt.Skip("not configured to exec third-party programs") |
| } |
| |
| testCases := [...]struct { |
| fileFormat FileFormat |
| command string |
| }{ |
| {FileFormatLZMA, "/usr/bin/lzcat"}, |
| {FileFormatXz, "/usr/bin/xzcat"}, |
| } |
| |
| // Not every system has "/usr/bin/{lzcat,xzcat}" commands. |
| for _, tc := range testCases { |
| if _, err := os.Stat(tc.command); err != nil { |
| tt.Skipf("%v", err) |
| } |
| } |
| |
| pi, err := os.ReadFile("../../test/data/pi.txt") |
| if err != nil { |
| tt.Fatalf("ReadFile: %v", err) |
| } else if len(pi) != 100003 { |
| tt.Fatalf("ReadFile: unexpected pi.txt file length") |
| } |
| |
| lengths := [...]int{0, 1, 10, 100, 1e3, 1e4, 1e5} |
| |
| for _, tc := range testCases { |
| for _, length := range lengths { |
| original := pi[:length] |
| |
| compressed, err := tc.fileFormat.Encode(nil, original) |
| if err != nil { |
| tt.Fatalf("%v, length=%d: Encode: %v", tc.fileFormat, length, err) |
| } |
| |
| stdout := bytes.Buffer{} |
| stderr := bytes.Buffer{} |
| |
| cmd := exec.Command(tc.command) |
| cmd.Stdin = bytes.NewReader(compressed) |
| cmd.Stdout = &stdout |
| cmd.Stderr = &stderr |
| if err := cmd.Run(); err != nil { |
| tt.Fatalf("%v, length=%d: Run: %v\nstderr:\n%s", tc.fileFormat, length, err, stderr.Bytes()) |
| } |
| |
| recovered := stdout.Bytes() |
| if !bytes.Equal(original, recovered) { |
| tt.Fatalf("%v, length=%d: round trip produced different bytes", tc.fileFormat, length) |
| } |
| } |
| } |
| } |