g10/filter.h

   1 /* filter.h
   2  * Copyright (C) 1998, 1999, 2000, 2001, 2003,
   3  *               2005 Free Software Foundation, Inc.
   4  *
   5  * This file is part of GnuPG.
   6  *
   7  * GnuPG is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * GnuPG is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20 #ifndef G10_FILTER_H
  21 #define G10_FILTER_H
  22
  23 #include "types.h"
  24 #include "cipher.h"
  25
  26 typedef struct {
  27     gcry_md_hd_t md;      /* catch all */
  28     gcry_md_hd_t md2;     /* if we want to calculate an alternate hash */
  29     size_t maxbuf_size;
  30 } md_filter_context_t;
  31
  32 typedef struct {
  33     int  refcount;          /* Initialized to 1.  */
  34
  35     /* these fields may be initialized */
  36     int what;               /* what kind of armor headers to write */
  37     int only_keyblocks;     /* skip all headers but ".... key block" */
  38     const char *hdrlines;   /* write these headerlines */
  39
  40     /* these fields must be initialized to zero */
  41     int no_openpgp_data;    /* output flag: "No valid OpenPGP data found" */
  42
  43     /* the following fields must be initialized to zero */
  44     int inp_checked;        /* set if the input has been checked */
  45     int inp_bypass;         /* set if the input is not armored */
  46     int in_cleartext;       /* clear text message */
  47     int not_dash_escaped;   /* clear text is not dash escaped */
  48     int hashes;             /* detected hash algorithms */
  49     int faked;              /* we are faking a literal data packet */
  50     int truncated;          /* number of truncated lines */
  51     int qp_detected;
  52     int pgp2mode;
  53     byte eol[3];            /* The end of line characters as a
  54                                zero-terminated string.  Defaults
  55                                (eol[0]=='\0') to whatever the local
  56                                platform uses. */
  57
  58     byte *buffer;           /* malloced buffer */
  59     unsigned buffer_size;   /* and size of this buffer */
  60     unsigned buffer_len;    /* used length of the buffer */
  61     unsigned buffer_pos;    /* read position */
  62
  63     byte radbuf[4];
  64     int idx, idx2;
  65     u32 crc;
  66
  67     int status;             /* an internal state flag */
  68     int cancel;
  69     int any_data;           /* any valid armored data seen */
  70     int pending_lf;         /* used together with faked */
  71 } armor_filter_context_t;
  72
  73 struct unarmor_pump_s;
  74 typedef struct unarmor_pump_s *UnarmorPump;
  75
  76
  77 struct compress_filter_context_s {
  78     int status;
  79     void *opaque;   /* (used for z_stream) */
  80     byte *inbuf;
  81     unsigned inbufsize;
  82     byte *outbuf;
  83     unsigned outbufsize;
  84     int algo;    /* compress algo */
  85     int algo1hack;
  86     int new_ctb;
  87     void (*release)(struct compress_filter_context_s*);
  88 };
  89 typedef struct compress_filter_context_s compress_filter_context_t;
  90
  91
  92 typedef struct {
  93     DEK *dek;
  94     u32 datalen;
  95     gcry_cipher_hd_t cipher_hd;
  96     int header;
  97     gcry_md_hd_t mdc_hash;
  98     byte enchash[20];
  99     int create_mdc; /* flag will be set by the cipher filter */
 100 } cipher_filter_context_t;
 101
 102
 103
 104 typedef struct {
 105     byte *buffer;           /* malloced buffer */
 106     unsigned buffer_size;   /* and size of this buffer */
 107     unsigned buffer_len;    /* used length of the buffer */
 108     unsigned buffer_pos;    /* read position */
 109     int truncated;          /* number of truncated lines */
 110     int not_dash_escaped;
 111     int escape_from;
 112     gcry_md_hd_t md;
 113     int pending_lf;
 114     int pending_esc;
 115 } text_filter_context_t;
 116
 117
 118 typedef struct {
 119     char *what;                 /* description */
 120     u32 last_time;              /* last time reported */
 121     unsigned long last;         /* last amount reported */
 122     unsigned long offset;       /* current amount */
 123     unsigned long total;        /* total amount */
 124     int  refcount;
 125 } progress_filter_context_t;
 126
 127 /* encrypt_filter_context_t defined in main.h */
 128
 129 /*-- mdfilter.c --*/
 130 int md_filter( void *opaque, int control, iobuf_t a, byte *buf, size_t *ret_len);
 131 void free_md_filter_context( md_filter_context_t *mfx );
 132
 133 /*-- armor.c --*/
 134 armor_filter_context_t *new_armor_context (void);
 135 void release_armor_context (armor_filter_context_t *afx);
 136 int push_armor_filter (armor_filter_context_t *afx, iobuf_t iobuf);
 137 int use_armor_filter( iobuf_t a );
 138 UnarmorPump unarmor_pump_new (void);
 139 void        unarmor_pump_release (UnarmorPump x);
 140 int         unarmor_pump (UnarmorPump x, int c);
 141
 142 /*-- compress.c --*/
 143 void push_compress_filter(iobuf_t out,compress_filter_context_t *zfx,int algo);
 144 void push_compress_filter2(iobuf_t out,compress_filter_context_t *zfx,
 145                            int algo,int rel);
 146
 147 /*-- cipher.c --*/
 148 int cipher_filter( void *opaque, int control,
 149                    iobuf_t chain, byte *buf, size_t *ret_len);
 150
 151 /*-- textfilter.c --*/
 152 int text_filter( void *opaque, int control,
 153                  iobuf_t chain, byte *buf, size_t *ret_len);
 154 int copy_clearsig_text (iobuf_t out, iobuf_t inp, gcry_md_hd_t md,
 155                         int escape_dash, int escape_from, int pgp2mode);
 156
 157 /*-- progress.c --*/
 158 progress_filter_context_t *new_progress_context (void);
 159 void release_progress_context (progress_filter_context_t *pfx);
 160 void handle_progress (progress_filter_context_t *pfx,
 161                       iobuf_t inp, const char *name);
 162
 163 #endif /*G10_FILTER_H*/