Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
branch: master
Fetching contributors…

Cannot retrieve contributors at this time

232 lines (192 sloc) 3.887 kb
/*
* Copyright (C) 2001-2,2007 Thomas Roessler <roessler@does-not-exist.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
/* yuck, we were including this one somewhere below. */
#include "mutt.h"
#include "lib.h"
#include "pgppacket.h"
#define CHUNKSIZE 1024
static unsigned char *pbuf = NULL;
static size_t plen = 0;
static int read_material (size_t material, size_t * used, FILE * fp)
{
if (*used + material >= plen)
{
unsigned char *p;
size_t nplen;
nplen = *used + material + CHUNKSIZE;
if (!(p = realloc (pbuf, nplen))) /* __MEM_CHECKED__ */
{
perror ("realloc");
return -1;
}
plen = nplen;
pbuf = p;
}
if (fread (pbuf + *used, 1, material, fp) < material)
{
perror ("fread");
return -1;
}
*used += material;
return 0;
}
unsigned char *pgp_read_packet (FILE * fp, size_t * len)
{
size_t used = 0;
LOFF_T startpos;
unsigned char ctb;
unsigned char b;
size_t material;
startpos = ftello (fp);
if (!plen)
{
plen = CHUNKSIZE;
pbuf = safe_malloc (plen);
}
if (fread (&ctb, 1, 1, fp) < 1)
{
if (!feof (fp))
perror ("fread");
goto bail;
}
if (!(ctb & 0x80))
{
goto bail;
}
if (ctb & 0x40) /* handle PGP 5.0 packets. */
{
int partial = 0;
pbuf[0] = ctb;
used++;
do
{
if (fread (&b, 1, 1, fp) < 1)
{
perror ("fread");
goto bail;
}
if (b < 192)
{
material = b;
partial = 0;
/* material -= 1; */
}
else if (192 <= b && b <= 223)
{
material = (b - 192) * 256;
if (fread (&b, 1, 1, fp) < 1)
{
perror ("fread");
goto bail;
}
material += b + 192;
partial = 0;
/* material -= 2; */
}
else if (b < 255)
{
material = 1 << (b & 0x1f);
partial = 1;
/* material -= 1; */
}
else
/* b == 255 */
{
unsigned char buf[4];
if (fread (buf, 4, 1, fp) < 1)
{
perror ("fread");
goto bail;
}
/*assert( sizeof(material) >= 4 ); */
material = buf[0] << 24;
material |= buf[1] << 16;
material |= buf[2] << 8;
material |= buf[3];
partial = 0;
/* material -= 5; */
}
if (read_material (material, &used, fp) == -1)
goto bail;
}
while (partial);
}
else
/* Old-Style PGP */
{
int bytes = 0;
pbuf[0] = 0x80 | ((ctb >> 2) & 0x0f);
used++;
switch (ctb & 0x03)
{
case 0:
{
if (fread (&b, 1, 1, fp) < 1)
{
perror ("fread");
goto bail;
}
material = b;
break;
}
case 1:
bytes = 2;
case 2:
{
int i;
if (!bytes)
bytes = 4;
material = 0;
for (i = 0; i < bytes; i++)
{
if (fread (&b, 1, 1, fp) < 1)
{
perror ("fread");
goto bail;
}
material = (material << 8) + b;
}
break;
}
default:
goto bail;
}
if (read_material (material, &used, fp) == -1)
goto bail;
}
if (len)
*len = used;
return pbuf;
bail:
fseeko (fp, startpos, SEEK_SET);
return NULL;
}
void pgp_release_packet (void)
{
plen = 0;
FREE (&pbuf);
}
Jump to Line
Something went wrong with that request. Please try again.