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add support for MapLibre Vector Tile (.mlt) #271

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Merged
bdon merged 1 commit into from
Feb 5, 2026
Merged

add support for MapLibre Vector Tile (.mlt) #271

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7 changes: 7 additions & 0 deletions pmtiles/directory.go
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@ const (
Jpeg = 3
Webp = 4
Avif = 5
Mlt = 6
)

// HeaderV3LenBytes is the fixed-size binary header size.
Expand Down Expand Up @@ -97,6 +98,8 @@ func headerContentType(header HeaderV3) (string, bool) {
return "image/webp", true
case Avif:
return "image/avif", true
case Mlt:
return "application/vnd.maplibre-vector-tile", true
default:
return "", false
}
Expand All @@ -114,6 +117,8 @@ func tileTypeToString(t TileType) string {
return "webp"
case Avif:
return "avif"
case Mlt:
return "mlt"
default:
return ""
}
Expand All @@ -131,6 +136,8 @@ func stringToTileType(t string) TileType {
return Webp
case "avif":
return Avif
case "mlt":
return Mlt
default:
return UnknownTileType
}
Expand Down
2 changes: 2 additions & 0 deletions pmtiles/directory_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -275,6 +275,7 @@ func TestStringifiedExtension(t *testing.T) {
assert.Equal(t, ".jpg", headerExt(HeaderV3{TileType: Jpeg}))
assert.Equal(t, ".webp", headerExt(HeaderV3{TileType: Webp}))
assert.Equal(t, ".avif", headerExt(HeaderV3{TileType: Avif}))
assert.Equal(t, ".mlt", headerExt(HeaderV3{TileType: Mlt}))
}

func TestStringToTileType(t *testing.T) {
Expand All @@ -283,6 +284,7 @@ func TestStringToTileType(t *testing.T) {
assert.Equal(t, "jpg", tileTypeToString(stringToTileType("jpg")))
assert.Equal(t, "webp", tileTypeToString(stringToTileType("webp")))
assert.Equal(t, "avif", tileTypeToString(stringToTileType("avif")))
assert.Equal(t, "mlt", tileTypeToString(stringToTileType("mlt")))
assert.Equal(t, "", tileTypeToString(stringToTileType("")))
}

Expand Down
4 changes: 4 additions & 0 deletions pmtiles/server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -364,6 +364,10 @@ func (server *Server) getTileAttempt(ctx context.Context, httpHeaders map[string
if ext != "avif" {
return 400, httpHeaders, []byte("path mismatch: archive is type AVIF (.avif)"), ""
}
case Mlt:
if ext != "mlt" {
return 400, httpHeaders, []byte("path mismatch: archive is type MLT (.mlt)"), ""
}
}

tileID := ZxyToID(z, x, y)
Expand Down
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