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 enum writer_enum {WRITER_ENUM};
  20
  21 struct writer_node {
  22         struct writer *writer;
  23         void *private_data;
  24         int chunk_bytes;
  25 };
  26
  27 struct writer {
  28         void (*init)(struct writer *w);
  29         int (*open)(struct writer_node *);
  30         int (*write)(char *data, size_t nbytes, struct writer_node *);
  31         void (*close)(struct writer_node *);
  32         void (*shutdown)(struct writer_node *);
  33 };
  34
  35 struct writer_node_group {
  36         unsigned num_writers;
  37         struct writer_node *writer_nodes;
  38         int *written;
  39         size_t max_chunk_bytes;
  40         int eof;
  41 };
  42
  43 #define FOR_EACH_WRITER_NODE(i, wng) for (i = 0; i < (wng)->num_writers; i++)
  44 #define FOR_EACH_WRITER(i) for (i = 0; i < NUM_SUPPORTED_WRITERS; i++)
  45
  46 DECLARE_WRITER_INITS;
  47 const char *writer_names[NUM_SUPPORTED_WRITERS];
  48 struct writer writers[NUM_SUPPORTED_WRITERS];