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/* kbxio.c - KBX I/O handling
* Copyright (C) 2000 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG 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.
*
* GnuPG 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 <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <gcrypt.h>
#include "iobuf.h"
#include "util.h"
#include "kbx.h"
int
kbx_read_blob ( KBXBLOB *r_blob, FILE *a )
{
char *image;
size_t imagelen = 0;
int c1, c2, c3, c4;
int rc;
*r_blob = NULL;
if ( (c1 = getc ( a )) == EOF
|| (c2 = getc ( a )) == EOF
|| (c3 = getc ( a )) == EOF
|| (c4 = getc ( a )) == EOF ) {
if ( c1 == EOF && !ferror ( a ) )
return -1;
return GPGERR_GENERAL;
}
imagelen = (c1 << 24) | (c2 << 16) | (c3 << 8 ) | c4;
if ( imagelen > 500000 ) { /* sanity check:blob too large */
return GPGERR_GENERAL;
}
else if ( imagelen < 4 ) { /* blobtoo short */
return GPGERR_GENERAL;
}
image = gcry_malloc ( imagelen );
if ( !image ) {
return GPGERR_GENERAL;
}
image[0] = c1; image[1] = c2; image[2] = c3; image[3] = c4;
if ( fread ( image+4, imagelen-4, 1, a ) != 1 ) {
gcry_free ( image );
return GPGERR_GENERAL;
}
rc = kbx_new_blob ( r_blob, image, imagelen );
return rc;
}
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