GNU Radio 3.5.1 C++ API
gr_file_descriptor_source.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2004 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio
00006  * 
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 
00023 #ifndef INCLUDED_GR_FILE_DESCRIPTOR_SOURCE_H
00024 #define INCLUDED_GR_FILE_DESCRIPTOR_SOURCE_H
00025 
00026 #include <gr_core_api.h>
00027 #include <gr_sync_block.h>
00028 
00029 class gr_file_descriptor_source;
00030 typedef boost::shared_ptr<gr_file_descriptor_source> gr_file_descriptor_source_sptr;
00031 
00032 GR_CORE_API gr_file_descriptor_source_sptr
00033 gr_make_file_descriptor_source (size_t itemsize, int fd, bool repeat = false);
00034 
00035 /*!
00036  * \brief Read stream from file descriptor.
00037  * \ingroup source_blk
00038  */
00039 
00040 class GR_CORE_API gr_file_descriptor_source : public gr_sync_block
00041 {
00042   friend GR_CORE_API gr_file_descriptor_source_sptr
00043   gr_make_file_descriptor_source (size_t itemsize, int fd, bool repeat);
00044  private:
00045   size_t         d_itemsize;
00046   int            d_fd;
00047   bool           d_repeat;
00048 
00049   unsigned char *d_residue;
00050   unsigned long  d_residue_len;
00051 
00052  protected:
00053   gr_file_descriptor_source (size_t itemsize, int fd, bool repeat);
00054 
00055   int read_items (char *buf, int nitems);
00056   int handle_residue (char *buf, int nbytes_read);
00057   void flush_residue () { d_residue_len = 0; }
00058 
00059 
00060  public:
00061   ~gr_file_descriptor_source ();
00062 
00063   int work (int noutput_items,
00064             gr_vector_const_void_star &input_items,
00065             gr_vector_void_star &output_items);
00066 };
00067 
00068 #endif /* INCLUDED_GR_FILE_DESCRIPTOR_SOURCE_H */