| // 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" |
| "io/ioutil" |
| "math/rand" |
| "os" |
| "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 := ioutil.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 := bytes.NewBuffer(nil) |
| 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 := ioutil.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" |
| c := make(chan error, 1) |
| go func() { |
| _, err := Decode(strings.NewReader(input)) |
| c <- err |
| }() |
| select { |
| case err := <-c: |
| if err == nil { |
| t.Fatalf("got nil error, want non-nil") |
| } |
| case <-time.After(3 * time.Second): |
| t.Fatalf("timed out") |
| } |
| } |
| |
| func TestPaddedRSTMarker(t *testing.T) { |
| // This test image comes from golang.org/issue/28717 |
| const base64EncodedImage = ` |
| /9j/4AAhQVZJMQABAQEAeAB4AAAAAAAAAAAAAAAAAAAAAAAAAP/bAEMABAIDAwMCBAMDAwQEBAQGCgYG |
| BQUGDAgJBwoODA8PDgwODxASFxMQERURDQ4UGhQVFxgZGhkPExweHBkeFxkZGP/bAEMBBAQEBgUGCwYG |
| CxgQDhAYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGP/EAaIA |
| AAEFAQEBAQEBAAAAAAAAAAABAgMEBQYHCAkKCxAAAgEDAwIEAwUFBAQAAAF9AQIDAAQRBRIhMUEGE1Fh |
| ByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3ODk6Q0RFRkdISUpTVFVWV1hZWmNk |
| ZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWmp6ipqrKztLW2t7i5usLDxMXGx8jJytLT |
| 1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6AQADAQEBAQEBAQEBAAAAAAAAAQIDBAUGBwgJCgsRAAIB |
| AgQEAwQHBQQEAAECdwABAgMRBAUhMQYSQVEHYXETIjKBCBRCkaGxwQkjM1LwFWJy0QoWJDThJfEXGBka |
| JicoKSo1Njc4OTpDREVGR0hJSlNUVVZXWFlaY2RlZmdoaWpzdHV2d3h5eoKDhIWGh4iJipKTlJWWl5iZ |
| mqKjpKWmp6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uLj5OXm5+jp6vLz9PX29/j5+v/dAAQA |
| Cv/gAAQAAP/AABEIALABQAMBIQACEQEDEQH/2gAMAwEAAhEDEQA/APnCFTk5BPPGKliAB718W7H2j3Ip |
| VUuwJxzTfKXacde9VBhYRUBAyO3pTmUAbSMU5WGmybywzHGAMdelPVFC+n1qXZCuyaJADxjj2qzbBMAP |
| xz1rKaVib6ltLcFvlIx2pLy0dwuAMMBnH1rFON9RNsszAZPFEYHldPzrOy3KewmBk9qUABugxjtTVmiW |
| xWRcjp+VJtHXgVL3K6AgBDdM9eRTNzAZViOe1VyxaJavuf/Q8aW4mUcSGpo764AyHz+FfnnJBvVH1UsN |
| CS1Q/wDte4Trip49ecA7g3FSqMW9zlqZandxJ4/EKADcSPqKni8QQMT865qOSUNjiqZdNbFiHWYXz84N |
| WE1KNsfMKj2zirHHPDSj0JFvo2H36d9pUjg1sqykYOm0KbgY60omXPXmr9pFkco3zBnrQzjGcnrRzp9S |
| bEbuOvao3fisZSXUpIYWGKGcbetTCSswsxnmACkYrtNSpJ2YNM//0fnK1BD7sDg9KmUHeOe/Svid3qfb |
| SdmQ3AHmnr1pGBC5z19a0hohNiJkensM1J0yCKmY0yZR82e+BT1BxnpmpepN9SRCR0NSpweOoPWs6isr |
| ijuWIZGBA/lVwzMVFY8ibuhXEfr+tOz8hIqUymhRnJGTSc5wBVRRDFPXBHJpB3qdmV0EX7vXmoyfl685 |
| p2dxWR//0vFsHZ9TQv3T618Bqz7PSwwn1phPXpSWrQEUhIx0NVXc7j0rSNwViCS4dWYpJj3BpBqVzGy7 |
| ZmHSq9kpblSpxkveQ+PX7uMf6wEDtU0fi24TAkX8jTeCjJaaHDUwFN7aFq28aL/GCMGrtr4xtHGGkA+t |
| YTy+a+E82eAa2LsXiWzI5mXPHercOsW8hwJB+dcUqVSCOKVFxdmiwl7E2MOPzp4nQ9GH51jzNbmUoOIC |
| TI4okOaUXoybDCevNBPHX8qIO4mf/9P52i4dix5zjp/n1qZFBCmviL6an2kt9CGcYnJznJpOBwegq4vQ |
| L9xIUytSkfu/bv70p7j6EnQgjHSpFGVqXclkkaHb1+makUHgdazm7IFuSKOasrnjis2+oDm9qnIHlgd/ |
| es7gxqjkt1NLwH4xTTEhjkhutM3D15oGhkcnBGRTDKu3A7H1rS3cLn//1PEhJ8uM557UvmDaa/P7a3Ps |
| xpZcZ6mo5WG45pdUC2K8ko5JIzWfcTqu7HPHrW9OLbKWhSluVLNz3wKrS3I3KfcV1Rg9CrpXK8l0F7io |
| pLnLnJHGOldMYJGMpu5XNwuxjyRTBcAAjd1HWtfZmPORy3WAWWQDOM4PWtHRru6DFlmY88ZqKsVyXaKp |
| QjOoa7axe28G/cWqhoHjO/n1WeJwSkS9c981wUcFCopPayFj8JC8VFbs6e38VldvmHHFaMHimAoCzDB6 |
| V5U8FKz5TlrZU4/CXYtdtnXIarEepW7jAcfnXGqEoKx5tfBzh0P/1fnqEAsc/wB6pI9owAD1618Qn3Ps |
| 35EE4UzHrx79aXaMcdaqAMWIADvj271IMeXg59KUmNLQkUDfjb1FSLxzg0pWJRLGAQAeMVIoA+uaxlaw |
| 0SoF/u1KowwwDUcwuo9wMjrUrY2ZPOKy0KY1T1NMdwG/CtBEFzMqnIPNUZ75FBJP5mtIQvYfoU21JFVs |
| N271AurRE/e611xw73Yj/9b50GsQhOXHWnpq8JX7w4PWvjPq76H2fzHjVYCud9Q3GrRAZDUvq75kNbMz |
| 7vV0zjdjNZ82pqzMcj7tdlPDtIiVWKKct+AxwRxUbXi7VPJAIrZUdEZOsrsga8DFgelQtd98g5P6V0Qp |
| GE6qIUut2cZ470kd2FjYc4Oce1bSpJ3Rzxq21GNcDZhSeg710ujKRbKzAg5rkxceWnqd+XtOo7bD9cl8 |
| qxLDPHasXwUvmyXU7Lgl8cegrnw2lGbZ14l3rU0bl3gMQCRgVU1y7WytUZQzMRwBXPRhzWRvVny3ZW8N |
| 6xPdXBikiZc5IOa6GG6nDsd5xnAyfaliqEacrGOHarx5pI//1/nuL754HWngEkYx1r4VWsfaMjk4mP8A |
| OgnjPH1rRMLKwR4A2jH1FPA+TNRIa0ROvQcY4p4GF/pUskmi6+gqRACvPrWMnpca3JABjFSKCQOnFS2u |
| o7E3XBOKcR8ucdKzUkDGSHGemKpXchVuP0rSmDMfUrl1J5rn9TvnVCc9OtelhoJtDekW0Yb6pId3zdRw |
| RVT+0pAPvc57CvbhQVrHlTxD3P8A/9D4tbUpTH1I7cU/7ZdMnyqcdsV5vsErXPbWJbHLdXzYQDBY8c02 |
| 6udQjyGVuD1FHsqfMridepZ6ED3s4IDqeD0I68VEt7J5hy3GO9aKkuhPt2BumeRjnv3pJLlgwBYE8ZqH |
| T2GqujYLcuWYbhj0zTHm5B/vcGtVBLYzdRtEcUueoGB3FOjmBjcBhx2NNx1IhO+uwtqd93EgA5YcV32n |
| IqwrnAz2rzMx+FI9nKldy+RmeMpfLs8DGTxTvBUKw6Csjry2WPbrXHB2wzfdnbUu8SvJF4xh1LDAJNU9 |
| UtVmDs3IiGB6CuenNx1R0yjfRGd4aRTqJdFG1ARXRgANg4/yK0xbvJehnhlaL9T/AP/R+e4x8xx609F+ |
| YZ718L6n2ju2RzqTKcYpQMjsc1pHTQWlgjUjGVH0qbkr0BqJSKRMi+uBx3p8a5HYVD8yb32JY15FSKpx |
| nisp6RuNbj1BzUyrnkmo6FEqrz7U/advHOazvcRHIuSazNXDpbSSJjeqErnpmrp6CueeXusahO5zKi8c |
| 7VrPuGklUiSQtkd6+po0YQs0edVrTd1cqeSoJOB0xUCxpnouAecV33e558rbH//S+KdmFHTk1btywUqc |
| YNcEnfc9SGl7DyAJ1AHIParx+YZ4/Guea2OmC1dhGjQn5kXNQtbQFiWiTlfSoTa2G0nuU5bG2aQ7V2jP |
| JU+1RSaXC2GjuApyOorX2slYz9lF3sV/7MmViFljaoJLG6SQbkyDXQqiZzyg1Yg8i4jBJjIBpsaPyXXB |
| Psea1TTMJJqysaeh2u/UUfP3QCBXdQJtTpivFzKV3FH0WURtCT8zmPHcrhkRSOWro7O28rRYIgOwGB3r |
| mnph4+bOxNvEy8kWFi+ULxwKzNRkMemSPj/WMT+FckNWdLv0KPhCMmGSZl6k1ulC3zY5x2+la4r+IyKH |
| wH//0/nuIHB9c9KevUAHk18La60PtHuRy/64+lOGBniqXcOlhUIxwB+NSrynSpndFImQc4A7d6lQccdR |
| WcyUyWMccDnPSpVAwM1nLYaeo5BjrUyjFTugJIwd2Kfgkc59qyTs7Axkigqao3qBkYdiMVpTeugHmF7b |
| hbhl2/dJB/OofJBTHfp9K+ppTbimeZOK5issYG5W7VWdBnHXB65rrjJs5JLof//U+LYtu7leM+lSpxIR |
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| Sqm7JH//2Q== |
| ` |
| |
| data, err := base64.StdEncoding.DecodeString(base64EncodedImage) |
| if err != nil { |
| t.Fatalf("base64 DecodeString: %v", err) |
| } |
| if _, err = Decode(bytes.NewReader(data)); err != nil { |
| t.Fatalf("Decode: %v", err) |
| } |
| } |
| |
| func TestExtraneousData(t *testing.T) { |
| // 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 benchmarkDecode(b *testing.B, filename string) { |
| data, err := ioutil.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") |
| } |
