115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
/* -*- C++ -*- */
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/*
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* Copyright 2010,2011 Steve Glass
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*
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* This file is part of OP25.
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*
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* OP25 is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* OP25 is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with OP25; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Boston, MA
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* 02110-1301, USA.
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*/
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#define __STDC_CONSTANT_MACROS
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <algorithm>
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#include <gr_io_signature.h>
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#include <iostream>
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#include <iomanip>
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#include <math.h>
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#include <op25_pcap_source_b.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdexcept>
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#include <strings.h>
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#define PCAP_DONT_INCLUDE_PCAP_BPF_H
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#include <pcap/pcap.h>
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using namespace std;
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op25_pcap_source_b_sptr
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op25_make_pcap_source_b(const char *path, float delay)
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{
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return op25_pcap_source_b_sptr(new op25_pcap_source_b(path, delay));
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}
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op25_pcap_source_b::~op25_pcap_source_b()
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{
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}
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int
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op25_pcap_source_b::work(int nof_output_items, gr_vector_const_void_star& input_items, gr_vector_void_star& output_items)
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{
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try {
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const size_t OCTETS_AVAIL = octets_.size();
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uint8_t *out = reinterpret_cast<uint8_t*>(output_items[0]);
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const int OCTETS_REQD = static_cast<size_t>(nof_output_items);
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for(int i = 0; i < OCTETS_REQD; ++i) {
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out[i] = octets_[loc_++];
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loc_ %= OCTETS_AVAIL;
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}
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return OCTETS_REQD;
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} catch(const std::exception& x) {
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cerr << x.what() << endl;
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exit(EXIT_FAILURE);
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} catch(...) {
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cerr << "unhandled exception" << endl;
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exit(EXIT_FAILURE);
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}
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}
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op25_pcap_source_b::op25_pcap_source_b(const char *path, float delay) :
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gr_sync_block ("pcap_source_b",
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gr_make_io_signature (0, 0, 0),
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gr_make_io_signature (1, 1, sizeof(uint8_t))),
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loc_(0),
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octets_(/* delay * 1200, 0 */)
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{
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char err[PCAP_ERRBUF_SIZE];
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pcap_t *pcap = pcap_open_offline(path, err);
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if(pcap) {
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struct pcap_pkthdr hdr;
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for(const uint8_t *octets; octets = pcap_next(pcap, &hdr);) {
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const size_t ETHERNET_SZ = 14;
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const size_t IP_SZ = 20;
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const size_t UDP_SZ = 8;
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const size_t P25CAI_OFS = ETHERNET_SZ + IP_SZ + UDP_SZ;
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if(P25CAI_OFS < hdr.caplen) {
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const size_t FRAME_SZ = hdr.caplen - P25CAI_OFS;
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#if 0
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// push some zero octets to separate frames
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const size_t SILENCE_OCTETS = 48;
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octets_.resize(octets_.size() + SILENCE_OCTETS, 0);
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#endif
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// push octets from frame payload into local buffer
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octets_.reserve(octets_.size() + hdr.caplen - P25CAI_OFS);
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for(size_t i = 0; i < FRAME_SZ; ++i) {
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octets_.push_back(octets[P25CAI_OFS + i]);
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}
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}
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}
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pcap_close(pcap);
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} else {
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cerr << "error: failed to open " << path;
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cerr << " (" << err << ")" << endl;
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exit(EXIT_FAILURE);
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}
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}
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