mirror of
https://git.openldap.org/openldap/openldap.git
synced 2024-12-21 03:10:25 +08:00
109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
/* lbase64.c - routines for dealing with base64 strings */
|
|
/* $OpenLDAP$ */
|
|
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
|
|
*
|
|
* Copyright 1998-2021 The OpenLDAP Foundation.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted only as authorized by the OpenLDAP
|
|
* Public License.
|
|
*
|
|
* A copy of this license is available in the file LICENSE in the
|
|
* top-level directory of the distribution or, alternatively, at
|
|
* <http://www.OpenLDAP.org/license.html>.
|
|
*/
|
|
/* Portions Copyright (c) 1992-1996 Regents of the University of Michigan.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted
|
|
* provided that this notice is preserved and that due credit is given
|
|
* to the University of Michigan at Ann Arbor. The name of the
|
|
* University may not be used to endorse or promote products derived
|
|
* from this software without specific prior written permission. This
|
|
* software is provided ``as is'' without express or implied warranty.
|
|
*/
|
|
/* This work was originally developed by the University of Michigan
|
|
* and distributed as part of U-MICH LDAP.
|
|
*/
|
|
|
|
#include "portable.h"
|
|
|
|
#include "ldap-int.h"
|
|
|
|
#define RIGHT2 0x03
|
|
#define RIGHT4 0x0f
|
|
|
|
static const unsigned char b642nib[0x80] = {
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
|
|
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
|
|
0x3c, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
|
|
0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
|
|
0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
|
|
0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
|
|
0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
|
|
0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
|
|
0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff
|
|
};
|
|
|
|
int
|
|
ldap_int_decode_b64_inplace( struct berval *value )
|
|
{
|
|
char *p, *end, *byte;
|
|
char nib;
|
|
|
|
byte = value->bv_val;
|
|
end = value->bv_val + value->bv_len;
|
|
|
|
for ( p = value->bv_val, value->bv_len = 0;
|
|
p < end;
|
|
p += 4, value->bv_len += 3 )
|
|
{
|
|
int i;
|
|
for ( i = 0; i < 4; i++ ) {
|
|
if ( p[i] != '=' && (p[i] & 0x80 ||
|
|
b642nib[ p[i] & 0x7f ] > 0x3f) ) {
|
|
Debug2( LDAP_DEBUG_ANY,
|
|
_("ldap_pvt_decode_b64_inplace: invalid base64 encoding"
|
|
" char (%c) 0x%x\n"), p[i], p[i] );
|
|
return( -1 );
|
|
}
|
|
}
|
|
|
|
/* first digit */
|
|
nib = b642nib[ p[0] & 0x7f ];
|
|
byte[0] = nib << 2;
|
|
/* second digit */
|
|
nib = b642nib[ p[1] & 0x7f ];
|
|
byte[0] |= nib >> 4;
|
|
byte[1] = (nib & RIGHT4) << 4;
|
|
/* third digit */
|
|
if ( p[2] == '=' ) {
|
|
value->bv_len += 1;
|
|
break;
|
|
}
|
|
nib = b642nib[ p[2] & 0x7f ];
|
|
byte[1] |= nib >> 2;
|
|
byte[2] = (nib & RIGHT2) << 6;
|
|
/* fourth digit */
|
|
if ( p[3] == '=' ) {
|
|
value->bv_len += 2;
|
|
break;
|
|
}
|
|
nib = b642nib[ p[3] & 0x7f ];
|
|
byte[2] |= nib;
|
|
|
|
byte += 3;
|
|
}
|
|
value->bv_val[ value->bv_len ] = '\0';
|
|
|
|
return LDAP_SUCCESS;
|
|
}
|