make the FindTile utility function part of public API [#46] (#230)

Author: bdon

pmtiles/directory.go

@@ -360,7 +360,7 @@ func DeserializeEntries(data *bytes.Buffer, compression Compression) []EntryV3 {
 	return entries
 }
 
-func findTile(entries []EntryV3, tileID uint64) (EntryV3, bool) {
+func FindTile(entries []EntryV3, tileID uint64) (EntryV3, bool) {
 	m := 0
 	n := len(entries) - 1
 	for m <= n {

pmtiles/directory_test.go

@@ -156,25 +156,25 @@ func TestOptimizeDirectories(t *testing.T) {
 
 func TestFindTileMissing(t *testing.T) {
 	entries := make([]EntryV3, 0)
-	_, ok := findTile(entries, 0)
+	_, ok := FindTile(entries, 0)
 	assert.False(t, ok)
 }
 
 func TestFindTileFirstEntry(t *testing.T) {
 	entries := []EntryV3{{TileID: 100, Offset: 1, Length: 1, RunLength: 1}}
-	entry, ok := findTile(entries, 100)
+	entry, ok := FindTile(entries, 100)
 	assert.Equal(t, true, ok)
 	assert.Equal(t, uint64(1), entry.Offset)
 	assert.Equal(t, uint32(1), entry.Length)
-	_, ok = findTile(entries, 101)
+	_, ok = FindTile(entries, 101)
 	assert.Equal(t, false, ok)
 }
 
 func TestFindTileMultipleEntries(t *testing.T) {
 	entries := []EntryV3{
 		{TileID: 100, Offset: 1, Length: 1, RunLength: 2},
 	}
-	entry, ok := findTile(entries, 101)
+	entry, ok := FindTile(entries, 101)
 	assert.Equal(t, true, ok)
 	assert.Equal(t, uint64(1), entry.Offset)
 	assert.Equal(t, uint32(1), entry.Length)
@@ -183,7 +183,7 @@ func TestFindTileMultipleEntries(t *testing.T) {
 		{TileID: 100, Offset: 1, Length: 1, RunLength: 1},
 		{TileID: 150, Offset: 2, Length: 2, RunLength: 2},
 	}
-	entry, ok = findTile(entries, 151)
+	entry, ok = FindTile(entries, 151)
 	assert.Equal(t, true, ok)
 	assert.Equal(t, uint64(2), entry.Offset)
 	assert.Equal(t, uint32(2), entry.Length)
@@ -193,7 +193,7 @@ func TestFindTileMultipleEntries(t *testing.T) {
 		{TileID: 100, Offset: 2, Length: 2, RunLength: 1},
 		{TileID: 150, Offset: 3, Length: 3, RunLength: 1},
 	}
-	entry, ok = findTile(entries, 51)
+	entry, ok = FindTile(entries, 51)
 	assert.Equal(t, true, ok)
 	assert.Equal(t, uint64(1), entry.Offset)
 	assert.Equal(t, uint32(1), entry.Length)
@@ -203,7 +203,7 @@ func TestFindTileLeafSearch(t *testing.T) {
 	entries := []EntryV3{
 		{TileID: 100, Offset: 1, Length: 1, RunLength: 0},
 	}
-	entry, ok := findTile(entries, 150)
+	entry, ok := FindTile(entries, 150)
 	assert.Equal(t, true, ok)
 	assert.Equal(t, uint64(1), entry.Offset)
 	assert.Equal(t, uint32(1), entry.Length)

pmtiles/server.go

@@ -377,7 +377,7 @@ func (server *Server) getTileAttempt(ctx context.Context, httpHeaders map[string
 			return 500, httpHeaders, []byte("I/O Error"), rootValue.etag
 		}
 		directory := dirValue.directory
-		entry, ok := findTile(directory, tileID)
+		entry, ok := FindTile(directory, tileID)
 		if !ok {
 			break
 		}

pmtiles/show.go

@@ -135,7 +135,7 @@ func Show(_ *log.Logger, output io.Writer, bucketURL string, key string, showHea
 				return fmt.Errorf("I/O Error")
 			}
 			directory := DeserializeEntries(bytes.NewBuffer(b), header.InternalCompression)
-			entry, ok := findTile(directory, tileID)
+			entry, ok := FindTile(directory, tileID)
 			if ok {
 				if entry.RunLength > 0 {
 					tileReader, err := bucket.NewRangeReader(ctx, key, int64(header.TileDataOffset+entry.Offset), int64(entry.Length))