sneak/quak
1
0
Fork 0
Code Issues 1 Pull Requests 1 Actions 12 Packages Projects Releases Wiki Activity

Test the GPS hemisphere rules readPhotoExif applies
check / check (push) Waiting to run
Details

Browse Source 
Two readPhotoExif tests on hand-built GPS IFDs: a GPSLatitude with
GPSLatitudeRef "S" gives a negative gpsLatitude, and a GPSLatitude and
GPSLongitude without their reference tags give neither field.

Model: opus-5-5
This commit is contained in:
sneak
2026-10-02 03:18:20 +00:00
parent 6dd22bcb73
commit b13018306c
1 changed files with 63 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
test/cli/metadata-exif.test.ts
+63
View File
@@ -67,6 +67,51 @@ const TIFF_ALTITUDE_WITHOUT_REF = [
...[0x00, 0x00, 0x00, 0x19, 0x00, 0x00, 0x00, 0x02], // 25/2, at 44
];
// A big-endian TIFF block holding a GPSLatitude of 33° 30' 0" and a
// GPSLatitudeRef of "S".
const TIFF_SOUTHERN_LATITUDE = [
...[0x4d, 0x4d, 0x00, 0x2a, 0x00, 0x00, 0x00, 0x08], // the first IFD at 8
// The first IFD, at 8: one entry, then no next IFD.
...[0x00, 0x01],
// The GPS IFD's offset (0x8825), LONG, 26.
...[0x88, 0x25, 0x00, 0x04, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x1a],
...[0x00, 0x00, 0x00, 0x00],
// The GPS IFD, at 26: two entries, then no next IFD.
...[0x00, 0x02],
// GPSLatitudeRef (0x0001), 2 ASCII bytes: "S".
...[0x00, 0x01, 0x00, 0x02, 0x00, 0x00, 0x00, 0x02, 0x53, 0x00, 0x00, 0x00],
// GPSLatitude (0x0002), three RATIONALs at 56.
...[0x00, 0x02, 0x00, 0x05, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x38],
...[0x00, 0x00, 0x00, 0x00],
...[0x00, 0x00, 0x00, 0x21, 0x00, 0x00, 0x00, 0x01], // 33/1, at 56
...[0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x01], // 30/1
...[0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01], // 0/1
];
// A big-endian TIFF block holding a GPSLatitude of 40° 26' 46" and a
// GPSLongitude of 79° 58' 56", and neither GPSLatitudeRef nor GPSLongitudeRef.
const TIFF_POSITION_WITHOUT_REFS = [
...[0x4d, 0x4d, 0x00, 0x2a, 0x00, 0x00, 0x00, 0x08], // the first IFD at 8
// The first IFD, at 8: one entry, then no next IFD.
...[0x00, 0x01],
// The GPS IFD's offset (0x8825), LONG, 26.
...[0x88, 0x25, 0x00, 0x04, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x1a],
...[0x00, 0x00, 0x00, 0x00],
// The GPS IFD, at 26: two entries, then no next IFD.
...[0x00, 0x02],
// GPSLatitude (0x0002), three RATIONALs at 56.
...[0x00, 0x02, 0x00, 0x05, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x38],
// GPSLongitude (0x0004), three RATIONALs at 80.
...[0x00, 0x04, 0x00, 0x05, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x50],
...[0x00, 0x00, 0x00, 0x00],
...[0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x01], // 40/1, at 56
...[0x00, 0x00, 0x00, 0x1a, 0x00, 0x00, 0x00, 0x01], // 26/1
...[0x00, 0x00, 0x00, 0x2e, 0x00, 0x00, 0x00, 0x01], // 46/1
...[0x00, 0x00, 0x00, 0x4f, 0x00, 0x00, 0x00, 0x01], // 79/1, at 80
...[0x00, 0x00, 0x00, 0x3a, 0x00, 0x00, 0x00, 0x01], // 58/1
...[0x00, 0x00, 0x00, 0x38, 0x00, 0x00, 0x00, 0x01], // 56/1
];
// A big-endian TIFF block holding Orientation 6 and a Make whose value lies
// past the end of the file.
const TIFF_MAKE_PAST_END = [
@@ -182,6 +227,24 @@ describe("readPhotoExif", () => {
});
});
it("reads a GPSLatitude with GPSLatitudeRef S as south of the equator", () => {
const data = [...EXIF_HEADER, ...TIFF_SOUTHERN_LATITUDE];
expect(
readPhotoExif(readAllExifTags(bytes(SOI, app1(data), SOS))),
).toStrictEqual({
gpsLatitude: -33.5,
});
});
it("gives no gpsLatitude or gpsLongitude without their reference tags", () => {
const data = [...EXIF_HEADER, ...TIFF_POSITION_WITHOUT_REFS];
const tags = readAllExifTags(bytes(SOI, app1(data), SOS));
// The position is read; only its hemisphere is unknown.
expect(tags.GPSLatitude?.computed).toStrictEqual([40, 26, 46]);
expect(tags.GPSLongitude?.computed).toStrictEqual([79, 58, 56]);
expect(readPhotoExif(tags)).toStrictEqual({});
});
it("gives no make for a Make whose value lies past the end of the file", () => {
const data = [...EXIF_HEADER, ...TIFF_MAKE_PAST_END];
expect(