ITS#8753 Move base64 decoding to separate file

[openldap] / libraries / libldap / lbase64.c

diff --git a/libraries/libldap/lbase64.c b/libraries/libldap/lbase64.c
new file mode 100644 (file)
index 0000000..fc60bb8
--- /dev/null
+++ b/libraries/libldap/lbase64.c
@@ -0,0 +1,108 @@
+/* lbase64.c - routines for dealing with base64 strings */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2017 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) ) {
+                               Debug( LDAP_DEBUG_ANY,
+                                       _("ldap_pvt_decode_b64_inplace: invalid base64 encoding"
+                                       " char (%c) 0x%x\n"), p[i], p[i], 0 );
+                               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;
+}