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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 2, 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., 59 Temple Place - Suite 330,
00020  * Boston, MA 02111-1307, USA.
00021  */
00022 
00023 #ifndef INCLUDED_GR_FILE_DESCRIPTOR_SOURCE_H
00024 #define INCLUDED_GR_FILE_DESCRIPTOR_SOURCE_H
00025 
00026 #include <gr_sync_block.h>
00027 
00028 class gr_file_descriptor_source;
00029 typedef boost::shared_ptr<gr_file_descriptor_source> gr_file_descriptor_source_sptr;
00030 
00031 gr_file_descriptor_source_sptr
00032 gr_make_file_descriptor_source (size_t itemsize, int fd, bool repeat = false);
00033 
00039 class gr_file_descriptor_source : public gr_sync_block
00040 {
00041   friend gr_file_descriptor_source_sptr
00042   gr_make_file_descriptor_source (size_t itemsize, int fd, bool repeat);
00043  private:
00044   size_t         d_itemsize;
00045   int            d_fd;
00046   bool           d_repeat;
00047 
00048   unsigned char *d_residue;
00049   unsigned long  d_residue_len;
00050 
00051  protected:
00052   gr_file_descriptor_source (size_t itemsize, int fd, bool repeat);
00053 
00054   int read_items (char *buf, int nitems);
00055   int handle_residue (char *buf, int nbytes_read);
00056   void flush_residue () { d_residue_len = 0; }
00057 
00058 
00059  public:
00060   ~gr_file_descriptor_source ();
00061 
00062   int work (int noutput_items,
00063             gr_vector_const_void_star &input_items,
00064             gr_vector_void_star &output_items);
00065 };
00066 
00067 #endif /* INCLUDED_GR_FILE_DESCRIPTOR_SOURCE_H */

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