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[rails.git] / lib / gpx.rb

diff --git a/lib/gpx.rb b/lib/gpx.rb
index cfc82eedb2445fd0d081872d3d89eb1b7629853a..45a4dcf5fc0bd62335ea0339409e2c1fbfd49e6d 100644 (file)
--- a/lib/gpx.rb
+++ b/lib/gpx.rb
@@ -4,29 +4,30 @@ module GPX
 
     include LibXML
 
-    attr_reader :possible_points
-    attr_reader :actual_points
-    attr_reader :tracksegs
+    attr_reader :possible_points, :actual_points, :tracksegs
 
-    def initialize(file)
+    def initialize(file, options = {})
       @file = file
+      @maximum_points = options[:maximum_points] || Float::INFINITY
     end
 
     def parse_file(reader)
       point = nil
 
       while reader.read
-        if reader.node_type == XML::Reader::TYPE_ELEMENT
+        case reader.node_type
+        when XML::Reader::TYPE_ELEMENT
           if reader.name == "trkpt"
             point = TrkPt.new(@tracksegs, reader["lat"].to_f, reader["lon"].to_f)
             @possible_points += 1
+            raise FileTooBigError if @possible_points > @maximum_points
           elsif reader.name == "ele" && point
             point.altitude = reader.read_string.to_f
           elsif reader.name == "time" && point
-            point.timestamp = Time.parse(reader.read_string)
+            point.timestamp = Time.parse(reader.read_string).utc
           end
-        elsif reader.node_type == XML::Reader::TYPE_END_ELEMENT
-          if reader.name == "trkpt" && point && point.valid?
+        when XML::Reader::TYPE_END_ELEMENT
+          if reader.name == "trkpt" && point&.valid?
             point.altitude ||= 0
             yield point
             @actual_points += 1
@@ -38,25 +39,25 @@ module GPX
     end
 
     def points(&block)
-      return enum_for(:points) unless block_given?
+      return enum_for(:points) unless block
 
       @possible_points = 0
       @actual_points = 0
       @tracksegs = 0
 
       begin
-        Archive::Reader.open_filename(@file).each_entry_with_data do |_entry, data|
-          parse_file(XML::Reader.string(data), &block)
+        Archive::Reader.open_filename(@file).each_entry_with_data do |entry, data|
+          parse_file(XML::Reader.string(data), &block) if entry.regular?
         end
       rescue Archive::Error
         io = ::File.open(@file)
 
-        case MimeMagic.by_magic(io).type
+        case Marcel::MimeType.for(io)
         when "application/gzip" then io = Zlib::GzipReader.open(@file)
         when "application/x-bzip" then io = Bzip2::FFI::Reader.open(@file)
         end
 
-        parse_file(XML::Reader.io(io), &block)
+        parse_file(XML::Reader.io(io, :options => XML::Parser::Options::NOERROR), &block)
       end
     end
 
@@ -66,7 +67,7 @@ module GPX
       height = 250
       delay = 50
 
-      points_per_frame = num_points / nframes
+      points_per_frame = (num_points.to_f / nframes).ceil
 
       proj = OSM::Mercator.new(min_lat, min_lon, max_lat, max_lon, width, height)
 
@@ -122,7 +123,7 @@ module GPX
 
       output = StringIO.new
       image.export(output)
-      output.read
+      output
     end
 
     def icon(min_lat, min_lon, max_lat, max_lon)
@@ -162,7 +163,7 @@ module GPX
         end
       end
 
-      image.gif
+      StringIO.new(image.gif)
     end
   end
 
@@ -173,4 +174,10 @@ module GPX
         longitude >= -180 && longitude <= 180
     end
   end
+
+  class FileTooBigError < RuntimeError
+    def initialise
+      super("GPX File contains too many points")
+    end
+  end
 end