initial commit of BRouter Version 0.98

brouter-mapaccess/src/main/java/btools/mapaccess/OsmFile.java

@@ -0,0 +1,67 @@
+/**
+ * cache for a single square
+ *
+ * @author ab
+ */
+package btools.mapaccess;
+
+import java.io.IOException;
+import java.io.RandomAccessFile;
+
+final class OsmFile
+{
+  private RandomAccessFile is = null;
+  private long fileOffset;
+
+  private int[] posIdx;
+  public MicroCache[] microCaches;
+
+  public int lonDegree;
+  public int latDegree;
+
+  public String filename;
+
+  public OsmFile( RandomAccessFile rafile, long startPos, byte[] iobuffer ) throws Exception
+  {
+    fileOffset = startPos;
+    if ( rafile != null )
+    {
+      is = rafile;
+      posIdx = new int[6400];
+      microCaches = new MicroCache[6400];
+      is.seek( fileOffset );
+      is.readFully( iobuffer, 0, 25600 );
+      ByteDataReader dis = new ByteDataReader( iobuffer );
+      for( int i=0; i<6400; i++ )
+      {
+        posIdx[i] = dis.readInt();
+      }
+    }
+  }
+
+  private int getPosIdx( int idx )
+  {
+    return  idx == -1 ? 25600 : posIdx[idx];
+  }
+
+  public int getDataInputForSubIdx( int subIdx, byte[] iobuffer ) throws Exception
+  {
+     int startPos = getPosIdx(subIdx-1);
+     int endPos = getPosIdx(subIdx);
+     int size = endPos-startPos;
+     if ( size > 0 )
+     {
+       is.seek( fileOffset + startPos );
+       if ( size <= iobuffer.length )
+       {
+         is.readFully( iobuffer );
+       }
+     }
+     return size;
+  }
+
+  public void close()
+  {
+    try { is.close(); } catch( IOException e ) { throw new RuntimeException( e ); }
+  }
+}