1 files changed, 114 insertions, 0 deletions
diff --git a/blocks/src/lib/op25_pcap_source_b.cc b/blocks/src/lib/op25_pcap_source_b.cc
new file mode 100644
index 0000000..234de64
--- /dev/null
+++ b/blocks/src/lib/op25_pcap_source_b.cc
@@ -0,0 +1,114 @@
+/* -*- C++ -*- */
+
+/*
+ * Copyright 2010,2011 Steve Glass
+ * 
+ * This file is part of OP25.
+ * 
+ * OP25 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 3, or (at your option)
+ * any later version.
+ * 
+ * OP25 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 OP25; see the file COPYING. If not, write to the Free
+ * Software Foundation, Inc., 51 Franklin Street, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#define __STDC_CONSTANT_MACROS
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <algorithm>
+#include <gr_io_signature.h>
+#include <iostream>
+#include <iomanip>
+#include <math.h>
+#include <op25_pcap_source_b.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdexcept>
+#include <strings.h>
+
+#define PCAP_DONT_INCLUDE_PCAP_BPF_H
+#include <pcap/pcap.h>
+
+using namespace std;
+
+op25_pcap_source_b_sptr
+op25_make_pcap_source_b(const char *path, float delay)
+{
+   return op25_pcap_source_b_sptr(new op25_pcap_source_b(path, delay));
+}
+
+op25_pcap_source_b::~op25_pcap_source_b()
+{
+}
+
+int
+op25_pcap_source_b::work(int nof_output_items, gr_vector_const_void_star& input_items, gr_vector_void_star& output_items)
+{
+   try {
+      const size_t OCTETS_AVAIL = octets_.size();
+      uint8_t *out = reinterpret_cast<uint8_t*>(output_items[0]);
+      const int OCTETS_REQD = static_cast<size_t>(nof_output_items);
+      for(int i = 0; i < OCTETS_REQD; ++i) {
+         out[i] = octets_[loc_++];
+         loc_ %= OCTETS_AVAIL;
+      }
+      return OCTETS_REQD;
+   } catch(const std::exception& x) {
+      cerr << x.what() << endl;
+      exit(EXIT_FAILURE);
+   } catch(...) {
+      cerr << "unhandled exception" << endl;
+      exit(EXIT_FAILURE);
+   }
+
+}
+
+op25_pcap_source_b::op25_pcap_source_b(const char *path, float delay) :
+   gr_sync_block ("pcap_source_b",
+                  gr_make_io_signature (0, 0, 0),
+                  gr_make_io_signature (1, 1, sizeof(uint8_t))),
+   loc_(0),
+   octets_(/* delay * 1200, 0 */)
+{
+   char err[PCAP_ERRBUF_SIZE];
+   pcap_t *pcap = pcap_open_offline(path, err);
+   if(pcap) {
+      struct pcap_pkthdr hdr;
+      for(const uint8_t *octets; octets = pcap_next(pcap, &hdr);) {
+         const size_t ETHERNET_SZ = 14;
+         const size_t IP_SZ = 20;
+         const size_t UDP_SZ = 8;
+         const size_t P25CAI_OFS = ETHERNET_SZ + IP_SZ + UDP_SZ;
+         if(P25CAI_OFS < hdr.caplen) {
+            const size_t FRAME_SZ = hdr.caplen - P25CAI_OFS;
+#if 0
+            // push some zero octets to separate frames
+            const size_t SILENCE_OCTETS = 48;
+            octets_.resize(octets_.size() + SILENCE_OCTETS, 0);
+#endif
+            // push octets from frame payload into local buffer
+            octets_.reserve(octets_.size() + hdr.caplen - P25CAI_OFS);
+            for(size_t i = 0; i < FRAME_SZ; ++i) {
+               octets_.push_back(octets[P25CAI_OFS + i]);
+            }
+         }
+      }
+      pcap_close(pcap);
+   } else {
+      cerr << "error: failed to open " << path;
+      cerr << " (" << err << ")" << endl;
+      exit(EXIT_FAILURE);
+   }
+}