gr_file_descriptor_source.h

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/* -*- c++ -*- */
/*
 * Copyright 2004 Free Software Foundation, Inc.
 * 
 * This file is part of GNU Radio
 * 
 * GNU Radio 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.
 * 
 * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef INCLUDED_GR_FILE_DESCRIPTOR_SOURCE_H
#define INCLUDED_GR_FILE_DESCRIPTOR_SOURCE_H

#include <gr_core_api.h>
#include <gr_sync_block.h>

class gr_file_descriptor_source;
typedef boost::shared_ptr<gr_file_descriptor_source> gr_file_descriptor_source_sptr;

GR_CORE_API gr_file_descriptor_source_sptr
gr_make_file_descriptor_source (size_t itemsize, int fd, bool repeat = false);

/*!
 * \brief Read stream from file descriptor.
 * \ingroup source_blk
 */

class GR_CORE_API gr_file_descriptor_source : public gr_sync_block
{
  friend GR_CORE_API gr_file_descriptor_source_sptr
  gr_make_file_descriptor_source (size_t itemsize, int fd, bool repeat);
 private:
  size_t         d_itemsize;
  int            d_fd;
  bool           d_repeat;

  unsigned char *d_residue;
  unsigned long  d_residue_len;

 protected:
  gr_file_descriptor_source (size_t itemsize, int fd, bool repeat);

  int read_items (char *buf, int nitems);
  int handle_residue (char *buf, int nbytes_read);
  void flush_residue () { d_residue_len = 0; }


 public:
  ~gr_file_descriptor_source ();

  int work (int noutput_items,
            gr_vector_const_void_star &input_items,
            gr_vector_void_star &output_items);
};

#endif /* INCLUDED_GR_FILE_DESCRIPTOR_SOURCE_H */