]>
git.sthu.org Git - pgp-tools.git/blob - keyanalyze/pgpring/pgppacket.c
2 * Copyright (C) 2001 Thomas Roessler <roessler@does-not-exist.org>
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of
7 * the License, or (at your option) any later version.
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.
14 * You should have received a copy of the GNU General Public
15 * License along with this program; if not, write to the Free
16 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 #include "pgppacket.h"
32 #define CHUNKSIZE 1024
34 static unsigned char *pbuf
= NULL
;
35 static size_t plen
= 0;
37 static int read_material (size_t material
, size_t * used
, FILE * fp
)
39 if (*used
+ material
>= plen
)
44 nplen
= *used
+ material
+ CHUNKSIZE
;
46 if (!(p
= realloc (pbuf
, nplen
))) /* __MEM_CHECKED__ */
55 if (fread (pbuf
+ *used
, 1, material
, fp
) < material
)
65 unsigned char *pgp_read_packet (FILE * fp
, size_t * len
)
73 startpos
= ftell (fp
);
78 pbuf
= safe_malloc (plen
);
81 if (fread (&ctb
, 1, 1, fp
) < 1)
93 if (ctb
& 0x40) /* handle PGP 5.0 packets. */
101 if (fread (&b
, 1, 1, fp
) < 1)
113 else if (192 <= b
&& b
<= 223)
115 material
= (b
- 192) * 256;
116 if (fread (&b
, 1, 1, fp
) < 1)
127 material
= 1 << (b
& 0x1f);
134 unsigned char buf
[4];
135 if (fread (buf
, 4, 1, fp
) < 1)
140 /*assert( sizeof(material) >= 4 ); */
141 material
= buf
[0] << 24;
142 material
|= buf
[1] << 16;
143 material
|= buf
[2] << 8;
149 if (read_material (material
, &used
, fp
) == -1)
159 pbuf
[0] = 0x80 | ((ctb
>> 2) & 0x0f);
166 if (fread (&b
, 1, 1, fp
) < 1)
188 for (i
= 0; i
< bytes
; i
++)
190 if (fread (&b
, 1, 1, fp
) < 1)
196 material
= (material
<< 8) + b
;
205 if (read_material (material
, &used
, fp
) == -1)
216 fseek (fp
, startpos
, SEEK_SET
);
220 void pgp_release_packet (void)