write.h

   1 /*
   2  * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file write.h writer-related structures */
  20
  21 enum writer_enum {WRITER_ENUM};
  22
  23 struct writer_node {
  24         struct writer *writer;
  25         void *private_data;
  26         int chunk_bytes;
  27 };
  28
  29 struct writer {
  30         void (*init)(struct writer *w);
  31         int (*open)(struct writer_node *);
  32         int (*write)(char *data, size_t nbytes, struct writer_node *);
  33         void (*close)(struct writer_node *);
  34         void (*shutdown)(struct writer_node *);
  35 };
  36
  37 struct writer_node_group {
  38         unsigned num_writers;
  39         struct writer_node *writer_nodes;
  40         int *written;
  41         size_t max_chunk_bytes;
  42         int eof;
  43 };
  44
  45 #define FOR_EACH_WRITER_NODE(i, wng) for (i = 0; i < (wng)->num_writers; i++)
  46 #define FOR_EACH_WRITER(i) for (i = 0; i < NUM_SUPPORTED_WRITERS; i++)
  47
  48 DECLARE_WRITER_INITS;
  49 extern const char *writer_names[];
  50 extern struct writer writers[NUM_SUPPORTED_WRITERS];