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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-16 19:23:18 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-16 19:23:18 +0000
commit43a123c1ae6613b3efeed291fa552ecd909d3acf (patch)
treefd92518b7024bc74031f78a1cf9e454b65e73665 /src/image/jpeg/reader_test.go
parentInitial commit. (diff)
downloadgolang-1.20-43a123c1ae6613b3efeed291fa552ecd909d3acf.tar.xz
golang-1.20-43a123c1ae6613b3efeed291fa552ecd909d3acf.zip
Adding upstream version 1.20.14.upstream/1.20.14upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/image/jpeg/reader_test.go')
-rw-r--r--src/image/jpeg/reader_test.go516
1 files changed, 516 insertions, 0 deletions
diff --git a/src/image/jpeg/reader_test.go b/src/image/jpeg/reader_test.go
new file mode 100644
index 0000000..02a2eb6
--- /dev/null
+++ b/src/image/jpeg/reader_test.go
@@ -0,0 +1,516 @@
+// 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
+BQUGDAgJBwoODA8PDgwODxASFxMQERURDQ4UGhQVFxgZGhkPExweHBkeFxkZGP/bAEMBBAQEBgUGCwYG
+CxgQDhAYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGP/EAaIA
+AAEFAQEBAQEBAAAAAAAAAAABAgMEBQYHCAkKCxAAAgEDAwIEAwUFBAQAAAF9AQIDAAQRBRIhMUEGE1Fh
+ByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3ODk6Q0RFRkdISUpTVFVWV1hZWmNk
+ZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWmp6ipqrKztLW2t7i5usLDxMXGx8jJytLT
+1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6AQADAQEBAQEBAQEBAAAAAAAAAQIDBAUGBwgJCgsRAAIB
+AgQEAwQHBQQEAAECdwABAgMRBAUhMQYSQVEHYXETIjKBCBRCkaGxwQkjM1LwFWJy0QoWJDThJfEXGBka
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+VUuwJxzTfKXacde9VBhYRUBAyO3pTmUAbSMU5WGmybywzHGAMdelPVFC+n1qXZCuyaJADxjj2qzbBMAP
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+`
+
+ 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 := 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")
+}