--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nss/lib/util/oidstring.c	Mon Jul 28 10:47:06 2014 +0200
@@ -0,0 +1,114 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#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 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;
+}