/* stream.h - internal definiton for the STREAM object
 * Copyright (C) 2002, 2003, 2007, 2008, 2010 Free Software Foundation,
 * Inc.
 *
 * Author: Timo Schulz
 *
 * This file is part of OpenCDK.
 *
 * The OpenCDK library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 * USA
 *
 */
#ifndef CDK_STREAM_H
#define CDK_STREAM_H

/* The default buffer size for the stream. */
#define STREAM_BUFSIZE 8192

enum
{
  fDUMMY = 0,
  fARMOR = 1,
  fCIPHER = 2,
  fLITERAL = 3,
  fCOMPRESS = 4,
  fHASH = 5,
  fTEXT = 6
};

/* Type definition for the filter function. */
typedef cdk_error_t (*filter_fnct_t) (void *opaque, int ctl, FILE * in,
                                      FILE * out);

/* The stream filter context structure. */
struct stream_filter_s
{
  struct stream_filter_s *next;
  filter_fnct_t fnct;
  void *opaque;
  FILE *tmp;
  union
  {
    armor_filter_t afx;
    cipher_filter_t cfx;
    literal_filter_t pfx;
    compress_filter_t zfx;
    text_filter_t tfx;
    md_filter_t mfx;
  } u;
  struct
  {
    unsigned enabled:1;
    unsigned rdonly:1;
    unsigned error:1;
  } flags;
  unsigned type;
  unsigned ctl;
};


/* The stream context structure. */
struct cdk_stream_s
{
  struct stream_filter_s *filters;
  int fmode;
  int error;
  size_t blkmode;
  struct
  {
    unsigned filtrated:1;
    unsigned eof:1;
    unsigned write:1;
    unsigned temp:1;
    unsigned reset:1;
    unsigned no_filter:1;
    unsigned compressed:3;
  } flags;
  struct
  {
    unsigned char *buf;
    unsigned on:1;
    size_t size;
    size_t alloced;
  } cache;
  char *fname;
  FILE *fp;
  unsigned int fp_ref:1;
  struct cdk_stream_cbs_s cbs;
  void *cbs_hd;
};

#endif /* CDK_STREAM_H */
