1 files changed, 80 insertions, 0 deletions
diff --git a/gr-trellis/src/lib/interleaver.cc b/gr-trellis/src/lib/interleaver.cc
new file mode 100644
index 000000000..12144bdc0
--- /dev/null
+++ b/gr-trellis/src/lib/interleaver.cc
@@ -0,0 +1,80 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2002 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <cstdio>
+#include <stdexcept>
+#include <cmath>
+#include "interleaver.h"
+
+interleaver::interleaver()
+{
+  d_K=0;
+  d_INTER.resize(0);
+  d_DEINTER.resize(0);
+}
+
+interleaver::interleaver(const interleaver &INTERLEAVER)
+{
+  d_K=INTERLEAVER.K();
+  d_INTER=INTERLEAVER.INTER();
+  d_DEINTER=INTERLEAVER.DEINTER();
+}
+
+interleaver::interleaver(const int K, const std::vector<int> &INTER)
+{
+  d_K=K;
+  d_INTER=INTER;
+  d_DEINTER.resize(d_K);
+  
+  // generate DEINTER table
+  for(int i=0;i<d_K;i++) {
+    d_DEINTER[d_INTER[i]]=i;
+  }
+}
+
+//######################################################################
+//# Read an INTERLEAVER specification from a file.
+//# Format (hopefully will become more flexible in the future...):
+//# K
+//# blank line
+//# list of space separated K integers from 0 to K-1 in appropriate order
+//# optional comments
+//######################################################################
+interleaver::interleaver(const char *name) 
+{
+  FILE *interleaverfile;
+
+  if((interleaverfile=fopen(name,"r"))==NULL) 
+    throw std::runtime_error ("file open error in interleaver()");
+    //printf("file open error in interleaver()\n");
+  
+  fscanf(interleaverfile,"%d\n",&d_K);
+  d_INTER.resize(d_K);
+  d_DEINTER.resize(d_K);
+
+  for(int i=0;i<d_K;i++) fscanf(interleaverfile,"%d",&(d_INTER[i]));
+  
+  // generate DEINTER table
+  for(int i=0;i<d_K;i++) {
+    d_DEINTER[d_INTER[i]]=i;
+  }
+}