Relocate common PAD code

1 files changed, 110 insertions, 0 deletions

diff --git a/src/pad_common.h b/src/pad_common.h
new file mode 100644
index 0000000..064774c
--- /dev/null
+++ b/src/pad_common.h
@@ -0,0 +1,110 @@
+/*
+    Copyright (C) 2014 CSP Innovazione nelle ICT s.c.a r.l. (http://rd.csp.it/)
+
+    Copyright (C) 2014, 2015 Matthias P. Braendli (http://opendigitalradio.org)
+
+    Copyright (C) 2015, 2016, 2017 Stefan Pöschel (http://opendigitalradio.org)
+
+    This program 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 of the License, or
+    (at your option) any later version.
+
+    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*!
+    \file pad_common.h
+    \brief Common parts related to PAD
+
+    \author Sergio Sagliocco <sergio.sagliocco@csp.it>
+    \author Matthias P. Braendli <matthias@mpb.li>
+    \author Stefan Pöschel <odr@basicmaster.de>
+*/
+
+#include <cstdio>
+#include <vector>
+#include <deque>
+#include <cstring>
+#include <string>
+#include <stdint.h>
+#include <unistd.h>
+
+#include "crc.h"
+
+
+
+typedef std::vector<uint8_t> uint8_vector_t;
+typedef uint8_vector_t pad_t;
+
+
+
+// --- DATA_GROUP -----------------------------------------------------------------
+struct DATA_GROUP {
+    uint8_vector_t data;
+    int apptype_start;
+    int apptype_cont;
+    size_t written;
+
+    DATA_GROUP(size_t len, int apptype_start, int apptype_cont);
+    void AppendCRC();
+    size_t Available();
+    int Write(uint8_t *write_data, size_t len, int *cont_apptype);
+};
+
+
+// --- PADPacketizer -----------------------------------------------------------------
+class PADPacketizer {
+private:
+    const size_t xpad_size_max;
+    const bool short_xpad;
+    const size_t max_cis;
+
+    size_t xpad_size;
+    uint8_t subfields[4*48];
+    size_t subfields_size;
+
+    // PAD w/  CI list
+    int ci_type[4];
+    size_t ci_len_index[4];
+    size_t used_cis;
+
+    // PAD w/o CI list
+    int last_ci_type;
+    size_t last_ci_size;
+
+    size_t AddCINeededBytes();
+    void AddCI(int apptype, int len_index);
+
+    int OptimalSubFieldSizeIndex(size_t available_bytes);
+    int WriteDGToSubField(DATA_GROUP* dg, size_t len);
+
+    bool AppendDG(DATA_GROUP* dg);
+    void AppendDGWithCI(DATA_GROUP* dg);
+    void AppendDGWithoutCI(DATA_GROUP* dg);
+
+    void ResetPAD();
+    pad_t* FlushPAD();
+public:
+    static const size_t SUBFIELD_LENS[];
+    static const size_t FPAD_LEN;
+    static const size_t SHORT_PAD;
+    static const size_t VARSIZE_PAD_MIN;
+    static const size_t VARSIZE_PAD_MAX;
+    static const std::string ALLOWED_PADLEN;
+
+    std::deque<DATA_GROUP*> queue;
+
+    PADPacketizer(size_t pad_size);
+    ~PADPacketizer();
+
+    pad_t* GetPAD();
+
+    // will be removed, when pull (instead of push) approach is implemented!
+    void WriteAllPADs(int output_fd);
+};