From 08afe004aec8fe43613a7a869083a2fe950e3297 Mon Sep 17 00:00:00 2001
From: Josh Baker <joshbaker77@gmail.com>
Date: Thu, 19 Apr 2018 17:24:47 -0700
Subject: [PATCH] Fix tile with zoom level over 63 panics

fixes #302
---
 pkg/bing/bing_test.go | 8 ++++++++
 pkg/bing/ext.go       | 4 ++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/pkg/bing/bing_test.go b/pkg/bing/bing_test.go
index 002284fb..4f01790e 100644
--- a/pkg/bing/bing_test.go
+++ b/pkg/bing/bing_test.go
@@ -92,3 +92,11 @@ func TestLatLonClippingFuzz(t *testing.T) {
 		}
 	}
 }
+
+func TestIssue302(t *testing.T) {
+	// Requesting tile with zoom level > 63 crashes the server #302
+	for z := uint64(0); z < 256; z++ {
+		tileX, tileY := PixelXYToTileXY(LatLongToPixelXY(33, -115, z))
+		TileXYToBounds(tileX, tileY, z)
+	}
+}
diff --git a/pkg/bing/ext.go b/pkg/bing/ext.go
index b9e73555..1ee06357 100644
--- a/pkg/bing/ext.go
+++ b/pkg/bing/ext.go
@@ -33,10 +33,10 @@ func TileXYToBounds(tileX, tileY int64, levelOfDetail uint64) (minLat, minLon, m
 	maxLat, minLon = PixelXYToLatLong(pixelX, pixelY, levelOfDetail)
 	pixelX, pixelY = TileXYToPixelXY(tileX+1, tileY+1)
 	minLat, maxLon = PixelXYToLatLong(pixelX, pixelY, levelOfDetail)
-	if tileX%size == 0 {
+	if size == 0 || tileX%size == 0 {
 		minLon = MinLongitude
 	}
-	if tileX%size == size-1 {
+	if size == 0 || tileX%size == size-1 {
 		maxLon = MaxLongitude
 	}
 	if tileY <= 0 {