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76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/* kbxio.c - KBX I/O handling
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* Copyright (C) 2000 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <gcrypt.h>
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#include "iobuf.h"
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#include "util.h"
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#include "kbx.h"
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int
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kbx_read_blob ( KBXBLOB *r_blob, FILE *a )
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{
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char *image;
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size_t imagelen = 0;
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int c1, c2, c3, c4;
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int rc;
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*r_blob = NULL;
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if ( (c1 = getc ( a )) == EOF
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|| (c2 = getc ( a )) == EOF
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|| (c3 = getc ( a )) == EOF
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|| (c4 = getc ( a )) == EOF ) {
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if ( c1 == EOF && !ferror ( a ) )
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return -1;
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return GPGERR_GENERAL;
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}
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imagelen = (c1 << 24) | (c2 << 16) | (c3 << 8 ) | c4;
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if ( imagelen > 500000 ) { /* sanity check:blob too large */
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return GPGERR_GENERAL;
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}
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else if ( imagelen < 4 ) { /* blobtoo short */
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return GPGERR_GENERAL;
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}
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image = gcry_malloc ( imagelen );
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if ( !image ) {
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return GPGERR_GENERAL;
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}
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image[0] = c1; image[1] = c2; image[2] = c3; image[3] = c4;
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if ( fread ( image+4, imagelen-4, 1, a ) != 1 ) {
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gcry_free ( image );
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return GPGERR_GENERAL;
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}
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rc = kbx_new_blob ( r_blob, image, imagelen );
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return rc;
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}
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