Working version of challenge

main.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"io/ioutil"
+	"log"
+
+	pb "github.com/dougreese/sdgopher-201609/vectorTile"
+	"github.com/golang/protobuf/proto"
+)
+
+// printValue prints key/value of a tile layer.
+func printValue(key string, val *pb.Tile_Value) {
+	switch {
+	case nil != val.StringValue:
+		log.Printf("- %s: %s", key, *val.StringValue)
+	case nil != val.FloatValue:
+		log.Printf("- %s: %f", key, *val.FloatValue)
+	case nil != val.DoubleValue:
+		log.Printf("- %s: %f", key, *val.DoubleValue)
+	case nil != val.IntValue:
+		log.Printf("- %s: %d", key, *val.IntValue)
+	case nil != val.UintValue:
+		log.Printf("- %s: %d", key, *val.UintValue)
+	case nil != val.SintValue:
+		log.Printf("- %s: %d", key, *val.SintValue)
+	default:
+		log.Println("I'm confused!")
+	}
+}
+
+func main() {
+	fname := "2751.vector.pbf"
+
+	log.Printf("Reading protobuf file: %s\n", fname)
+	in, err := ioutil.ReadFile(fname)
+	if err != nil {
+		log.Fatalln("Error reading file:", err)
+	}
+	tile := &pb.Tile{}
+	if err := proto.Unmarshal(in, tile); err != nil {
+		log.Fatalln("Failed to parse tile:", err)
+	}
+
+	layers := tile.Layers
+	log.Println("Num layers", len(layers))
+
+	for i := 0; i < len(layers); i++ {
+		layer := layers[i]
+		log.Println("Name:", layer.GetName())
+
+		keys := layer.GetKeys()
+		values := layer.GetValues()
+
+		for j := 0; j < len(keys); j++ {
+			val := values[j]
+			printValue(keys[j], val)
+		}
+	}
+
+	log.Println("Success!")
+}

vectorTile/vector_tile.proto

@@ -1,5 +1,6 @@
 // Protocol Version 1
 
+syntax = "proto2";
 package vector_tile;
 
 option optimize_for = LITE_RUNTIME;
@@ -44,7 +45,7 @@ message Tile {
                 optional GeomType type = 3 [ default = UNKNOWN ];
 
                 // Contains a stream of commands and parameters (vertices).
-                // A detailed description on geometry encoding is located in 
+                // A detailed description on geometry encoding is located in
                 // section 4.3 of the specification.
                 repeated uint32 geometry = 4 [ packed = true ];
         }