michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include <string.h>
michael@0: #include "secitem.h"
michael@0: #include "secport.h"
michael@0: #include "secerr.h"
michael@0: 
michael@0: /* if to->data is not NULL, and to->len is large enough to hold the result,
michael@0:  * then the resultant OID will be copyed into to->data, and to->len will be
michael@0:  * changed to show the actual OID length.
michael@0:  * Otherwise, memory for the OID will be allocated (from the caller's 
michael@0:  * PLArenaPool, if pool is non-NULL) and to->data will receive the address
michael@0:  * of the allocated data, and to->len will receive the OID length.
michael@0:  * The original value of to->data is not freed when a new buffer is allocated.
michael@0:  * 
michael@0:  * The input string may begin with "OID." and this still be ignored.
michael@0:  * The length of the input string is given in len.  If len == 0, then 
michael@0:  * len will be computed as strlen(from), meaning it must be NUL terminated.
michael@0:  * It is an error if from == NULL, or if *from == '\0'.
michael@0:  */
michael@0: 
michael@0: SECStatus
michael@0: SEC_StringToOID(PLArenaPool *pool, SECItem *to, const char *from, PRUint32 len)
michael@0: {
michael@0:     PRUint32 decimal_numbers = 0;
michael@0:     PRUint32 result_bytes = 0;
michael@0:     SECStatus rv;
michael@0:     PRUint8 result[1024];
michael@0: 
michael@0:     static const PRUint32 max_decimal = (0xffffffff / 10);
michael@0:     static const char OIDstring[] = {"OID."};
michael@0: 
michael@0:     if (!from || !to) {
michael@0:     	PORT_SetError(SEC_ERROR_INVALID_ARGS);
michael@0: 	return SECFailure;
michael@0:     }
michael@0:     if (!len) {
michael@0:     	len = PL_strlen(from);
michael@0:     }
michael@0:     if (len >= 4 && !PL_strncasecmp(from, OIDstring, 4)) {
michael@0:     	from += 4; /* skip leading "OID." if present */
michael@0: 	len  -= 4;
michael@0:     }
michael@0:     if (!len) {
michael@0: bad_data:
michael@0:     	PORT_SetError(SEC_ERROR_BAD_DATA);
michael@0: 	return SECFailure;
michael@0:     }
michael@0:     do {
michael@0: 	PRUint32 decimal = 0;
michael@0:         while (len > 0 && isdigit(*from)) {
michael@0: 	    PRUint32 addend = (*from++ - '0');
michael@0: 	    --len;
michael@0: 	    if (decimal > max_decimal)  /* overflow */
michael@0: 		goto bad_data;
michael@0: 	    decimal = (decimal * 10) + addend;
michael@0: 	    if (decimal < addend)	/* overflow */
michael@0: 		goto bad_data;
michael@0: 	}
michael@0: 	if (len != 0 && *from != '.') {
michael@0: 	    goto bad_data;
michael@0: 	}
michael@0: 	if (decimal_numbers == 0) {
michael@0: 	    if (decimal > 2)
michael@0: 	    	goto bad_data;
michael@0: 	    result[0] = decimal * 40;
michael@0: 	    result_bytes = 1;
michael@0: 	} else if (decimal_numbers == 1) {
michael@0: 	    if (decimal > 40)
michael@0: 	    	goto bad_data;
michael@0: 	    result[0] += decimal;
michael@0: 	} else {
michael@0: 	    /* encode the decimal number,  */
michael@0: 	    PRUint8 * rp;
michael@0: 	    PRUint32 num_bytes = 0;
michael@0: 	    PRUint32 tmp = decimal;
michael@0: 	    while (tmp) {
michael@0: 	        num_bytes++;
michael@0: 		tmp >>= 7;
michael@0: 	    }
michael@0: 	    if (!num_bytes )
michael@0: 	    	++num_bytes;  /* use one byte for a zero value */
michael@0: 	    if (num_bytes + result_bytes > sizeof result)
michael@0: 	    	goto bad_data;
michael@0: 	    tmp = num_bytes;
michael@0: 	    rp = result + result_bytes - 1;
michael@0: 	    rp[tmp] = (PRUint8)(decimal & 0x7f);
michael@0: 	    decimal >>= 7;
michael@0: 	    while (--tmp > 0) {
michael@0: 		rp[tmp] = (PRUint8)(decimal | 0x80);
michael@0: 		decimal >>= 7;
michael@0: 	    }
michael@0: 	    result_bytes += num_bytes;
michael@0: 	}
michael@0: 	++decimal_numbers;
michael@0: 	if (len > 0) { /* skip trailing '.' */
michael@0: 	    ++from;
michael@0: 	    --len;
michael@0: 	}
michael@0:     } while (len > 0);
michael@0:     /* now result contains result_bytes of data */
michael@0:     if (to->data && to->len >= result_bytes) {
michael@0:     	PORT_Memcpy(to->data, result, to->len = result_bytes);
michael@0: 	rv = SECSuccess;
michael@0:     } else {
michael@0:     	SECItem result_item = {siBuffer, NULL, 0 };
michael@0: 	result_item.data = result;
michael@0: 	result_item.len  = result_bytes;
michael@0: 	rv = SECITEM_CopyItem(pool, to, &result_item);
michael@0:     }
michael@0:     return rv;
michael@0: }