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/* guessarmortype.c - Guess type of armored data
* Copyright (C) 1999 Michael Roth <mroth@gnupg.org>
*
* This file is part of pgpgpg.
*
* pgpgpg 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.
*
* pgpgpg 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "includes.h"
#include "guessarmortype.h"
/*****************************************************************************
*
* Function : guess_armor_type
*
* Purpose : Try to guess the type of armored data in a file.
*
* Input : filename - The filename of the file with armored data to guess
* type of.
*
* Output : An integer defined as ARMOR_TYPE_xxx
*
* Errors : Returns ARMOR_TYPE_ERROR when an error occured.
*
* Notes : This works not very well for real PGP 2.6 armored data because
* PGP 2.6 don't specificy the type in the begin line very well.
*
*****************************************************************************/
int guess_armor_type(char *filename)
{
FILE * in;
char buffer[512];
int mode = 1;
int i;
if (!( in = fopen(filename, "r") ))
return ARMOR_TYPE_ERROR;
while (mode) {
if (!fgets(buffer, 512, in)) {
fclose(in);
return ARMOR_TYPE_ERROR;
}
if (mode == 1) { /* normal check */
if (strncmp(buffer, "-----BEGIN PGP ", 15) == 0)
mode = 0;
else if (strncmp(buffer, "-----END PGP ", 13) == 0) {
fclose(in);
return ARMOR_TYPE_ERROR;
}
}
if (mode != 0) {
if (strlen(buffer) && buffer[strlen(buffer)-1] == '\n')
mode = 1; /* line ending found, check next line */
else
mode = 2; /* search for the line ending */
}
}
fclose(in);
/*
* A begin pgp clause was found. Strip all trailing space, tab,
* return and newline characters
*/
i = strlen(buffer) - 1;
while (strchr(" \t\r\n", buffer[i]))
buffer[i--] = 0;
/*
* Check the various PGP message types
*/
if (strcmp(buffer, "-----BEGIN PGP MESSAGE-----")==0)
return ARMOR_TYPE_MESSAGE;
else if (strcmp(buffer, "-----BEGIN PGP SIGNED MESSAGE-----")==0)
return ARMOR_TYPE_SIGNED_MESSAGE;
else if (strcmp(buffer, "-----BEGIN PGP SIGNATURE-----")==0)
return ARMOR_TYPE_SIGNATURE;
else
return ARMOR_TYPE_UNKNOWN;
}
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