move geometry reader to header file

include/llmr/geometry/geometry.hpp

@@ -0,0 +1,75 @@
+#ifndef LLMR_GEOMETRY_GEOMETRY
+#define LLMR_GEOMETRY_GEOMETRY
+
+#include <llmr/util/pbf.hpp>
+
+#include <cstdlib>
+
+namespace llmr {
+
+class geometry {
+public:
+    inline geometry(const uint8_t *data, uint32_t bytes);
+
+    enum command {
+        end = 0,
+        move_to = 1,
+        line_to = 2,
+        close = 7
+    };
+
+    inline command next(int32_t &rx, int32_t &ry);
+
+private:
+    pbf pbf;
+    uint32_t cmd;
+    uint32_t length;
+    int32_t x, y;
+    int32_t ox, oy;
+};
+
+geometry::geometry(const uint8_t *data, uint32_t bytes)
+    : pbf(data, bytes),
+      cmd(1),
+      length(0),
+      x(0), y(0),
+      ox(0), oy(0) {}
+
+geometry::command geometry::next(int32_t &rx, int32_t &ry) {
+    if (pbf.data < pbf.end) {
+        if (!length) {
+            uint32_t cmd_length = (uint32_t)pbf.varint();
+            cmd = cmd_length & 0x7;
+            length = cmd_length >> 3;
+        }
+
+        length--;
+
+        if (cmd == move_to || cmd == line_to) {
+            rx = (x += pbf.svarint());
+            ry = (y += pbf.svarint());
+
+            if (cmd == move_to) {
+                ox = x;
+                oy = y;
+                return move_to;
+            } else {
+                return line_to;
+            }
+        } else if (cmd == close) {
+            rx = ox;
+            ry = oy;
+            return close;
+        } else {
+            fprintf(stderr, "unknown command: %d\n", cmd);
+            // TODO: gracefully handle geometry parse failures
+            return end;
+        }
+    } else {
+        return end;
+    }
+}
+
+}
+
+#endif

include/llmr/util/pbf.hpp

@@ -1,4 +1,5 @@
-#pragma once
+#ifndef LLMR_UTIL_PBF
+#define LLMR_UTIL_PBF
 
 /*
  * Some parts are from upb - a minimalist implementation of protocol buffers.
@@ -23,8 +24,6 @@ namespace llmr {
 
 struct pbf {
 	inline pbf(const unsigned char *data, uint32_t length);
-	inline pbf(const char *data, uint32_t length);
-	// inline pbf(const std::string& buffer);
 
 	inline bool next();
 	template <typename T = uint32_t> inline T varint();
@@ -61,11 +60,6 @@ pbf::pbf(const unsigned char *data, uint32_t length)
 	  end(data + length)
 {}
 
-pbf::pbf(const char *data, uint32_t length)
-	: data((const unsigned char *)data),
-	  end((const unsigned char *)data + length)
-{}
-
 // pbf::pbf(const std::string& buffer)
 // 	: data((const unsigned char *)buffer.data()),
 // 	  end((const unsigned char *)buffer.data() + buffer.size())
@@ -206,3 +200,5 @@ void pbf::skipBytes(uint32_t bytes)
 
 } // end namespace llmr
 
+#endif
+

src/map/tile.cpp

@@ -5,9 +5,10 @@
 // #include <iostream>
 #include <thread>
 
-#include "pbf.hpp"
+#include <llmr/util/pbf.hpp>
 #include <llmr/util/vec2.hpp>
 #include <llmr/util/string.hpp>
+#include <llmr/geometry/geometry.hpp>
 #include <cmath>
 
 using namespace llmr;
@@ -175,50 +176,15 @@ void tile::parseFeature(const uint8_t *data, uint32_t bytes) {
 }
 
 void tile::loadGeometry(const uint8_t *data, uint32_t bytes) {
-    pbf geometry(data, bytes);
+    geometry geometry(data, bytes);
 
-    uint32_t cmd = 1;
-    uint32_t length = 0;
-    int32_t x = 0, y = 0;
-
-    // var lines = [];
-    // var line = null;
-    int32_t ox = 0, oy = 0;
-
-    while (geometry.data < geometry.end) {
-        if (!length) {
-            uint32_t cmd_length = (uint32_t)geometry.varint();
-            cmd = cmd_length & 0x7;
-            length = cmd_length >> 3;
-        }
-
-        length--;
-
-        if (cmd == 1 || cmd == 2) {
-            x += geometry.svarint();
-            y += geometry.svarint();
-
-            if (cmd == 1) {
-                // moveTo
-                // fprintf(stderr, "[m %d/%d] ", x, y);
-                // degenerate vertex
+    geometry::command cmd;
+    int32_t x, y;
+    while ((cmd = geometry.next(x, y)) != geometry::end) {
+        if (cmd == geometry::move_to) {
             lineVertex.addDegenerate();
-                ox = x;
-                oy = y;
-            } else {
-                // lineTo
-                // fprintf(stderr, "[l %d/%d] ", x, y);
         }
+
         lineVertex.addCoordinate(x, y);
-        } else if (cmd == 7) {
-            // closePolygon
-            // fprintf(stderr, "[c]\n");
-            lineVertex.addCoordinate(ox, oy);
-        } else {
-            // throw new Error('unknown command ' + cmd);
-            // throw std::runtime_error("unknown command");
-            fprintf(stderr, "unknown command");
-            exit(1);
-        }
     }
 }