lib/opencdk/stream.h

   1 /* stream.h - internal definiton for the STREAM object
   2  * Copyright (C) 2002-2012 Free Software Foundation, Inc.
   3  *
   4  * Author: Timo Schulz
   5  *
   6  * This file is part of OpenCDK.
   7  *
   8  * The OpenCDK library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public License
  10  * as published by the Free Software Foundation; either version 3 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>
  20  *
  21  */
  22
  23 #ifndef CDK_STREAM_H
  24 #define CDK_STREAM_H
  25
  26 /* The default buffer size for the stream. */
  27 #define STREAM_BUFSIZE 8192
  28
  29 enum
  30 {
  31   fDUMMY = 0,
  32   fARMOR = 1,
  33   fCIPHER = 2,
  34   fLITERAL = 3,
  35   fCOMPRESS = 4,
  36   fHASH = 5,
  37   fTEXT = 6
  38 };
  39
  40 /* Type definition for the filter function. */
  41 typedef cdk_error_t (*filter_fnct_t) (void *uint8_t, int ctl, FILE * in,
  42                                       FILE * out);
  43
  44 /* The stream filter context structure. */
  45 struct stream_filter_s
  46 {
  47   struct stream_filter_s *next;
  48   filter_fnct_t fnct;
  49   void *uint8_t;
  50   FILE *tmp;
  51   union
  52   {
  53     armor_filter_t afx;
  54     cipher_filter_t cfx;
  55     literal_filter_t pfx;
  56     compress_filter_t zfx;
  57     text_filter_t tfx;
  58     md_filter_t mfx;
  59   } u;
  60   struct
  61   {
  62     unsigned enabled:1;
  63     unsigned rdonly:1;
  64     unsigned error:1;
  65   } flags;
  66   unsigned type;
  67   unsigned ctl;
  68 };
  69
  70
  71 /* The stream context structure. */
  72 struct cdk_stream_s
  73 {
  74   struct stream_filter_s *filters;
  75   int fmode;
  76   int error;
  77   size_t blkmode;
  78   struct
  79   {
  80     unsigned filtrated:1;
  81     unsigned eof:1;
  82     unsigned write:1;
  83     unsigned temp:1;
  84     unsigned reset:1;
  85     unsigned no_filter:1;
  86     unsigned compressed:3;
  87   } flags;
  88   struct
  89   {
  90     unsigned char *buf;
  91     unsigned on:1;
  92     size_t size;
  93     size_t alloced;
  94   } cache;
  95   char *fname;
  96   FILE *fp;
  97   unsigned int fp_ref:1;
  98   struct cdk_stream_cbs_s cbs;
  99   void *cbs_hd;
 100 };
 101
 102 #endif /* CDK_STREAM_H */