| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "encoding/binary" |
| 6 | "image" |
| 7 | "image/color" |
| 8 | "image/jpeg" |
| 9 | "testing" |
| 10 | ) |
| 11 | |
| 12 | func jpegBytes(t *testing.T, w, h int) []byte { |
| 13 | t.Helper() |
| 14 | img := image.NewRGBA(image.Rect(0, 0, w, h)) |
| 15 | for y := 0; y < h; y++ { |
| 16 | for x := 0; x < w; x++ { |
| 17 | img.Set(x, y, color.RGBA{R: 200, G: 10, B: 10, A: 255}) |
| 18 | } |
| 19 | } |
| 20 | var b bytes.Buffer |
| 21 | if err := jpeg.Encode(&b, img, nil); err != nil { |
| 22 | t.Fatal(err) |
| 23 | } |
| 24 | return b.Bytes() |
| 25 | } |
| 26 | |
| 27 | func TestBuildDownloadFilename(t *testing.T) { |
| 28 | cases := map[string]string{"photo.jpg": "photo_compressed.webp", "photo": "photo_compressed.webp", "": "compressed_compressed.webp", "a.b.c.png": "a.b.c_compressed.webp"} |
| 29 | for in, want := range cases { |
| 30 | if got := buildDownloadFilename(in, "webp"); got != want { |
| 31 | t.Fatalf("%q got %q want %q", in, got, want) |
| 32 | } |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | func TestCompressImage(t *testing.T) { |
| 37 | if _, err := compressImage([]byte("not an image"), 80, 0); err == nil { |
| 38 | t.Fatal("expected invalid image error") |
| 39 | } |
| 40 | out, err := compressImage(jpegBytes(t, 4, 2), 80, 0) |
| 41 | if err != nil { |
| 42 | t.Fatal(err) |
| 43 | } |
| 44 | if len(out) == 0 { |
| 45 | t.Fatal("empty output") |
| 46 | } |
| 47 | resized, err := compressImage(jpegBytes(t, 4, 2), 80, 2) |
| 48 | if err != nil { |
| 49 | t.Fatal(err) |
| 50 | } |
| 51 | img, _, err := image.Decode(bytes.NewReader(resized)) |
| 52 | if err != nil { |
| 53 | t.Fatal(err) |
| 54 | } |
| 55 | if img.Bounds().Dx() != 2 || img.Bounds().Dy() != 1 { |
| 56 | t.Fatalf("resized bounds %v", img.Bounds()) |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | func makeExif(order binary.ByteOrder, magic string, gps bool) []byte { |
| 61 | b := make([]byte, 40) |
| 62 | copy(b[:2], magic) |
| 63 | order.PutUint16(b[2:4], 42) |
| 64 | order.PutUint32(b[4:8], 8) |
| 65 | order.PutUint16(b[8:10], 1) |
| 66 | if gps { |
| 67 | order.PutUint16(b[10:12], 0x8825) |
| 68 | order.PutUint32(b[18:22], 30) |
| 69 | order.PutUint16(b[30:32], 7) |
| 70 | } else { |
| 71 | order.PutUint16(b[10:12], 0x010f) |
| 72 | } |
| 73 | return b |
| 74 | } |
| 75 | |
| 76 | func TestStripGPS(t *testing.T) { |
| 77 | short := []byte{1, 2, 3} |
| 78 | if !bytes.Equal(stripGPS(short), short) { |
| 79 | t.Fatal("short exif changed") |
| 80 | } |
| 81 | bad := []byte("not-tiff-data") |
| 82 | if !bytes.Equal(stripGPS(bad), bad) { |
| 83 | t.Fatal("bad header changed") |
| 84 | } |
| 85 | le := stripGPS(makeExif(binary.LittleEndian, "II", true)) |
| 86 | if binary.LittleEndian.Uint16(le[30:32]) != 0 { |
| 87 | t.Fatal("little endian gps not zeroed") |
| 88 | } |
| 89 | be := stripGPS(makeExif(binary.BigEndian, "MM", true)) |
| 90 | if binary.BigEndian.Uint16(be[30:32]) != 0 { |
| 91 | t.Fatal("big endian gps not zeroed") |
| 92 | } |
| 93 | noGPS := makeExif(binary.LittleEndian, "II", false) |
| 94 | if !bytes.Equal(stripGPS(noGPS), noGPS) { |
| 95 | t.Fatal("no gps changed") |
| 96 | } |
| 97 | } |