// Copyright 2012 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package jpeg import ( "bytes" "encoding/base64" "fmt" "image" "image/color" "io" "math/rand" "os" "runtime/debug" "strings" "testing" "time" ) // TestDecodeProgressive tests that decoding the baseline and progressive // versions of the same image result in exactly the same pixel data, in YCbCr // space for color images, and Y space for grayscale images. func TestDecodeProgressive(t *testing.T) { testCases := []string{ "../testdata/video-001", "../testdata/video-001.q50.410", "../testdata/video-001.q50.411", "../testdata/video-001.q50.420", "../testdata/video-001.q50.422", "../testdata/video-001.q50.440", "../testdata/video-001.q50.444", "../testdata/video-005.gray.q50", "../testdata/video-005.gray.q50.2x2", "../testdata/video-001.separate.dc.progression", } for _, tc := range testCases { m0, err := decodeFile(tc + ".jpeg") if err != nil { t.Errorf("%s: %v", tc+".jpeg", err) continue } m1, err := decodeFile(tc + ".progressive.jpeg") if err != nil { t.Errorf("%s: %v", tc+".progressive.jpeg", err) continue } if m0.Bounds() != m1.Bounds() { t.Errorf("%s: bounds differ: %v and %v", tc, m0.Bounds(), m1.Bounds()) continue } // All of the video-*.jpeg files are 150x103. if m0.Bounds() != image.Rect(0, 0, 150, 103) { t.Errorf("%s: bad bounds: %v", tc, m0.Bounds()) continue } switch m0 := m0.(type) { case *image.YCbCr: m1 := m1.(*image.YCbCr) if err := check(m0.Bounds(), m0.Y, m1.Y, m0.YStride, m1.YStride); err != nil { t.Errorf("%s (Y): %v", tc, err) continue } if err := check(m0.Bounds(), m0.Cb, m1.Cb, m0.CStride, m1.CStride); err != nil { t.Errorf("%s (Cb): %v", tc, err) continue } if err := check(m0.Bounds(), m0.Cr, m1.Cr, m0.CStride, m1.CStride); err != nil { t.Errorf("%s (Cr): %v", tc, err) continue } case *image.Gray: m1 := m1.(*image.Gray) if err := check(m0.Bounds(), m0.Pix, m1.Pix, m0.Stride, m1.Stride); err != nil { t.Errorf("%s: %v", tc, err) continue } default: t.Errorf("%s: unexpected image type %T", tc, m0) continue } } } func decodeFile(filename string) (image.Image, error) { f, err := os.Open(filename) if err != nil { return nil, err } defer f.Close() return Decode(f) } type eofReader struct { data []byte // deliver from Read without EOF dataEOF []byte // then deliver from Read with EOF on last chunk lenAtEOF int } func (r *eofReader) Read(b []byte) (n int, err error) { if len(r.data) > 0 { n = copy(b, r.data) r.data = r.data[n:] } else { n = copy(b, r.dataEOF) r.dataEOF = r.dataEOF[n:] if len(r.dataEOF) == 0 { err = io.EOF if r.lenAtEOF == -1 { r.lenAtEOF = n } } } return } func TestDecodeEOF(t *testing.T) { // Check that if reader returns final data and EOF at same time, jpeg handles it. data, err := os.ReadFile("../testdata/video-001.jpeg") if err != nil { t.Fatal(err) } n := len(data) for i := 0; i < n; { r := &eofReader{data[:n-i], data[n-i:], -1} _, err := Decode(r) if err != nil { t.Errorf("Decode with Read() = %d, EOF: %v", r.lenAtEOF, err) } if i == 0 { i = 1 } else { i *= 2 } } } // check checks that the two pix data are equal, within the given bounds. func check(bounds image.Rectangle, pix0, pix1 []byte, stride0, stride1 int) error { if stride0 <= 0 || stride0%8 != 0 { return fmt.Errorf("bad stride %d", stride0) } if stride1 <= 0 || stride1%8 != 0 { return fmt.Errorf("bad stride %d", stride1) } // Compare the two pix data, one 8x8 block at a time. for y := 0; y < len(pix0)/stride0 && y < len(pix1)/stride1; y += 8 { for x := 0; x < stride0 && x < stride1; x += 8 { if x >= bounds.Max.X || y >= bounds.Max.Y { // We don't care if the two pix data differ if the 8x8 block is // entirely outside of the image's bounds. For example, this can // occur with a 4:2:0 chroma subsampling and a 1x1 image. Baseline // decoding works on the one 16x16 MCU as a whole; progressive // decoding's first pass works on that 16x16 MCU as a whole but // refinement passes only process one 8x8 block within the MCU. continue } for j := 0; j < 8; j++ { for i := 0; i < 8; i++ { index0 := (y+j)*stride0 + (x + i) index1 := (y+j)*stride1 + (x + i) if pix0[index0] != pix1[index1] { return fmt.Errorf("blocks at (%d, %d) differ:\n%sand\n%s", x, y, pixString(pix0, stride0, x, y), pixString(pix1, stride1, x, y), ) } } } } } return nil } func pixString(pix []byte, stride, x, y int) string { s := &strings.Builder{} for j := 0; j < 8; j++ { fmt.Fprintf(s, "\t") for i := 0; i < 8; i++ { fmt.Fprintf(s, "%02x ", pix[(y+j)*stride+(x+i)]) } fmt.Fprintf(s, "\n") } return s.String() } func TestTruncatedSOSDataDoesntPanic(t *testing.T) { b, err := os.ReadFile("../testdata/video-005.gray.q50.jpeg") if err != nil { t.Fatal(err) } sosMarker := []byte{0xff, 0xda} i := bytes.Index(b, sosMarker) if i < 0 { t.Fatal("SOS marker not found") } i += len(sosMarker) j := i + 10 if j > len(b) { j = len(b) } for ; i < j; i++ { Decode(bytes.NewReader(b[:i])) } } func TestLargeImageWithShortData(t *testing.T) { // This input is an invalid JPEG image, based on the fuzzer-generated image // in issue 10413. It is only 504 bytes, and shouldn't take long for Decode // to return an error. The Start Of Frame marker gives the image dimensions // as 8192 wide and 8192 high, so even if an unreadByteStuffedByte bug // doesn't technically lead to an infinite loop, such a bug can still cause // an unreasonably long loop for such a short input. const input = "" + "\xff\xd8\xff\xe0\x00\x10\x4a\x46\x49\x46\x00\x01\x01\x00\x00\x01" + "\x00\x01\x00\x00\xff\xdb\x00\x43\x00\x10\x0b\x0c\x0e\x0c\x0a\x10" + "\x0e\x89\x0e\x12\x11\x10\x13\x18\xff\xd8\xff\xe0\x00\x10\x4a\x46" + "\x49\x46\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb\x00\x43" + "\x00\x10\x0b\x0c\x0e\x0c\x0a\x10\x0e\x0d\x0e\x12\x11\x10\x13\x18" + "\x28\x1a\x18\x16\x16\x18\x31\x23\x25\x1d\x28\x3a\x33\x3d\x3c\x39" + "\x33\x38\x37\x40\x48\x5c\x4e\x40\x44\x57\x45\x37\x38\x50\x6d\x51" + "\x57\x5f\x62\x67\x68\x67\x3e\x4d\x71\x79\x70\x64\x78\x5c\x65\x67" + "\x63\xff\xc0\x00\x0b\x08\x20\x00\x20\x00\x01\x01\x11\x00\xff\xc4" + "\x00\x1f\x00\x00\x01\x05\x01\x01\x01\x01\x01\x01\x00\x00\x00\x00" + "\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\xff" + "\xc4\x00\xb5\x10\x00\x02\x01\x03\x03\x02\x04\x03\x05\x05\x04\x04" + "\x00\x00\x01\x7d\x01\x02\x03\x00\x04\x11\x05\x12\x21\x31\x01\x06" + "\x13\x51\x61\x07\x22\x71\x14\x32\x81\x91\xa1\x08\x23\xd8\xff\xdd" + "\x42\xb1\xc1\x15\x52\xd1\xf0\x24\x33\x62\x72\x82\x09\x0a\x16\x17" + "\x18\x19\x1a\x25\x26\x27\x28\x29\x2a\x34\x35\x36\x37\x38\x39\x3a" + "\x43\x44\x45\x46\x47\x48\x49\x4a\x53\x54\x55\x56\x57\x58\x59\x5a" + "\x00\x63\x64\x65\x66\x67\x68\x69\x6a\x73\x74\x75\x76\x77\x78\x79" + "\x7a\x83\x84\x85\x86\x87\x88\x89\x8a\x92\x93\x94\x95\x96\x97\x98" + "\x99\x9a\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xb2\xb3\xb4\xb5\xb6" + "\xb7\xb8\xb9\xba\xc2\xc3\xc4\xc5\xc6\xc7\xff\xd8\xff\xe0\x00\x10" + "\x4a\x46\x49\x46\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb" + "\x00\x43\x00\x10\x0b\x0c\x0e\x0c\x0a\x10\x0e\x0d\x0e\x12\x11\x10" + "\x13\x18\x28\x1a\x18\x16\x16\x18\x31\x23\x25\x1d\xc8\xc9\xca\xd2" + "\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8" + "\xe9\xea\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xff\xda\x00\x08" + "\x01\x01\x00\x00\x3f\x00\xb9\xeb\x50\xb0\xdb\xc8\xa8\xe4\x63\x80" + "\xdd\x31\xd6\x9d\xbb\xf2\xc5\x42\x1f\x6c\x6f\xf4\x34\xdd\x3c\xfc" + "\xac\xe7\x3d\x80\xa9\xcc\x87\x34\xb3\x37\xfa\x2b\x9f\x6a\xad\x63" + "\x20\x36\x9f\x78\x64\x75\xe6\xab\x7d\xb2\xde\x29\x70\xd3\x20\x27" + "\xde\xaf\xa4\xf0\xca\x9f\x24\xa8\xdf\x46\xa8\x24\x84\x96\xe3\x77" + "\xf9\x2e\xe0\x0a\x62\x7f\xdf\xd9" timer := time.AfterFunc(30*time.Second, func() { debug.SetTraceback("all") panic("TestLargeImageWithShortData stuck in Decode") }) defer timer.Stop() _, err := Decode(strings.NewReader(input)) if err == nil { t.Fatalf("got nil error, want non-nil") } } func TestPaddedRSTMarker(t *testing.T) { // This test image comes from golang.org/issue/28717 const base64EncodedImage = ` /9j/4AAhQVZJMQABAQEAeAB4AAAAAAAAAAAAAAAAAAAAAAAAAP/bAEMABAIDAwMCBAMDAwQEBAQGCgYG 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Encode a 1x1 red image. src := image.NewRGBA(image.Rect(0, 0, 1, 1)) src.Set(0, 0, color.RGBA{0xff, 0x00, 0x00, 0xff}) buf := new(bytes.Buffer) if err := Encode(buf, src, nil); err != nil { t.Fatalf("encode: %v", err) } enc := buf.String() // Sanity check that the encoded JPEG is long enough, that it ends in a // "\xff\xd9" EOI marker, and that it contains a "\xff\xda" SOS marker // somewhere in the final 64 bytes. if len(enc) < 64 { t.Fatalf("encoded JPEG is too short: %d bytes", len(enc)) } if got, want := enc[len(enc)-2:], "\xff\xd9"; got != want { t.Fatalf("encoded JPEG ends with %q, want %q", got, want) } if s := enc[len(enc)-64:]; !strings.Contains(s, "\xff\xda") { t.Fatalf("encoded JPEG does not contain a SOS marker (ff da) near the end: % x", s) } // Test that adding some random junk between the SOS marker and the // EOI marker does not affect the decoding. rnd := rand.New(rand.NewSource(1)) for i, nerr := 0, 0; i < 1000 && nerr < 10; i++ { buf.Reset() // Write all but the trailing "\xff\xd9" EOI marker. buf.WriteString(enc[:len(enc)-2]) // Write some random extraneous data. for n := rnd.Intn(10); n > 0; n-- { if x := byte(rnd.Intn(256)); x != 0xff { buf.WriteByte(x) } else { // The JPEG format escapes a SOS 0xff data byte as "\xff\x00". buf.WriteString("\xff\x00") } } // Write the "\xff\xd9" EOI marker. buf.WriteString("\xff\xd9") // Check that we can still decode the resultant image. got, err := Decode(buf) if err != nil { t.Errorf("could not decode image #%d: %v", i, err) nerr++ continue } if got.Bounds() != src.Bounds() { t.Errorf("image #%d, bounds differ: %v and %v", i, got.Bounds(), src.Bounds()) nerr++ continue } if averageDelta(got, src) > 2<<8 { t.Errorf("image #%d changed too much after a round trip", i) nerr++ continue } } } func TestIssue56724(t *testing.T) { b, err := os.ReadFile("../testdata/video-001.jpeg") if err != nil { t.Fatal(err) } b = b[:24] // truncate image data _, err = Decode(bytes.NewReader(b)) if err != io.ErrUnexpectedEOF { t.Errorf("got: %v, want: %v", err, io.ErrUnexpectedEOF) } } func benchmarkDecode(b *testing.B, filename string) { data, err := os.ReadFile(filename) if err != nil { b.Fatal(err) } cfg, err := DecodeConfig(bytes.NewReader(data)) if err != nil { b.Fatal(err) } b.SetBytes(int64(cfg.Width * cfg.Height * 4)) b.ReportAllocs() b.ResetTimer() for i := 0; i < b.N; i++ { Decode(bytes.NewReader(data)) } } func BenchmarkDecodeBaseline(b *testing.B) { benchmarkDecode(b, "../testdata/video-001.jpeg") } func BenchmarkDecodeProgressive(b *testing.B) { benchmarkDecode(b, "../testdata/video-001.progressive.jpeg") }