/* ***** BEGIN LICENSE BLOCK *****
            * Version: MPL 1.1/GPL 2.0/LGPL 2.1
            *
            * The contents of this file are subject to the Mozilla Public License Version
            * 1.1 (the "License"); you may not use this file except in compliance with
            * the License. You may obtain a copy of the License at
            * http://www.mozilla.org/MPL/
            *
            * Software distributed under the License is distributed on an "AS IS" basis,
            * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
            * for the specific language governing rights and limitations under the
            * License.
            *
            * The Original Code is the Network Security Services.
            *
            * The Initial Developer of the Original Code is Nelson B Bolyard
            * Portions created by the Initial Developer are Copyright (C) 2007
            * the Initial Developer. All Rights Reserved.
            *
            * Contributor(s):
            *
            * Alternatively, the contents of this file may be used under the terms of
            * either the GNU General Public License Version 2 or later (the "GPL"), or
            * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
            * in which case the provisions of the GPL or the LGPL are applicable instead
            * of those above. If you wish to allow use of your version of this file only
            * under the terms of either the GPL or the LGPL, and not to allow others to
            * use your version of this file under the terms of the MPL, indicate your
            * decision by deleting the provisions above and replace them with the notice
            * and other provisions required by the GPL or the LGPL. If you do not delete
            * the provisions above, a recipient may use your version of this file under
            * the terms of any one of the MPL, the GPL or the LGPL.
            *
            * ***** END LICENSE BLOCK ***** */
           
           #include <string.h>
           #include "secitem.h"
           #include "secport.h"
           #include "secerr.h"
           
           /* if to->data is not NULL, and to->len is large enough to hold the result,
            * then the resultant OID will be copyed into to->data, and to->len will be
            * changed to show the actual OID length.
            * Otherwise, memory for the OID will be allocated (from the caller's 
            * PLArenaPool, if pool is non-NULL) and to->data will receive the address
            * of the allocated data, and to->len will receive the OID length.
            * The original value of to->data is not freed when a new buffer is allocated.
            * 
            * The input string may begin with "OID." and this still be ignored.
            * The length of the input string is given in len.  If len == 0, then 
            * len will be computed as strlen(from), meaning it must be NUL terminated.
            * It is an error if from == NULL, or if *from == '\0'.
            */
           
           SECStatus
           SEC_StringToOID(PLArenaPool *pool, SECItem *to, const char *from, PRUint32 len)
           {
     ##### ->     PRUint32 result_len = 0;
     ##### ->     PRUint32 decimal_numbers = 0;
     ##### ->     PRUint32 result_bytes = 0;
               SECStatus rv;
               PRUint8 result[1024];
           
               static const PRUint32 max_decimal = (0xffffffff / 10);
               static const char OIDstring[] = {"OID."};
           
     ##### ->     if (!from || !to) {
     ##### ->     	PORT_SetError(SEC_ERROR_INVALID_ARGS);
     ##### -> 	return SECFailure;
               }
     ##### ->     if (!len) {
     ##### ->     	len = PL_strlen(from);
               }
     ##### ->     if (len >= 4 && !PL_strncasecmp(from, OIDstring, 4)) {
     ##### ->     	from += 4; /* skip leading "OID." if present */
     ##### -> 	len  -= 4;
               }
     ##### ->     if (!len) {
           bad_data:
     ##### ->     	PORT_SetError(SEC_ERROR_BAD_DATA);
     ##### -> 	return SECFailure;
               }
               do {
     ##### -> 	PRUint32 decimal = 0;
     ##### ->         while (len > 0 && isdigit(*from)) {
     ##### -> 	    PRUint32 addend = (*from++ - '0');
     ##### -> 	    --len;
     ##### -> 	    if (decimal > max_decimal)  /* overflow */
     ##### -> 		goto bad_data;
     ##### -> 	    decimal = (decimal * 10) + addend;
     ##### -> 	    if (decimal < addend)	/* overflow */
     ##### -> 		goto bad_data;
           	}
     ##### -> 	if (len != 0 && *from != '.') {
     ##### -> 	    goto bad_data;
           	}
     ##### -> 	if (decimal_numbers == 0) {
     ##### -> 	    if (decimal > 2)
     ##### -> 	    	goto bad_data;
     ##### -> 	    result[0] = decimal * 40;
     ##### -> 	    result_bytes = 1;
     ##### -> 	} else if (decimal_numbers == 1) {
     ##### -> 	    if (decimal > 40)
     ##### -> 	    	goto bad_data;
     ##### -> 	    result[0] += decimal;
           	} else {
           	    /* encode the decimal number,  */
           	    PRUint8 * rp;
     ##### -> 	    PRUint32 num_bytes = 0;
     ##### -> 	    PRUint32 tmp = decimal;
     ##### -> 	    while (tmp) {
     ##### -> 	        num_bytes++;
     ##### -> 		tmp >>= 7;
           	    }
     ##### -> 	    if (!num_bytes )
     ##### -> 	    	++num_bytes;  /* use one byte for a zero value */
     ##### -> 	    if (num_bytes + result_bytes > sizeof result)
     ##### -> 	    	goto bad_data;
     ##### -> 	    tmp = num_bytes;
     ##### -> 	    rp = result + result_bytes - 1;
     ##### -> 	    rp[tmp] = (PRUint8)(decimal & 0x7f);
     ##### -> 	    decimal >>= 7;
     ##### -> 	    while (--tmp > 0) {
     ##### -> 		rp[tmp] = (PRUint8)(decimal | 0x80);
     ##### -> 		decimal >>= 7;
           	    }
     ##### -> 	    result_bytes += num_bytes;
           	}
     ##### -> 	++decimal_numbers;
     ##### -> 	if (len > 0) { /* skip trailing '.' */
     ##### -> 	    ++from;
     ##### -> 	    --len;
           	}
     ##### ->     } while (len > 0);
               /* now result contains result_bytes of data */
     ##### ->     if (to->data && to->len >= result_bytes) {
     ##### ->     	PORT_Memcpy(to->data, result, to->len = result_bytes);
     ##### -> 	rv = SECSuccess;
               } else {
     ##### ->     	SECItem result_item = {siBuffer, NULL, 0 };
     ##### -> 	result_item.data = result;
     ##### -> 	result_item.len  = result_bytes;
     ##### -> 	rv = SECITEM_CopyItem(pool, to, &result_item);
               }
     ##### ->     return rv;
           }


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