'use strict'
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/**
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* Find the ending position of the attribute type name portion of an RDN.
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* This function does not verify if the name is a valid description string
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* or numeric OID. It merely reads a string from the given starting position
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* to the spec defined end of an attribute type string.
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*
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* @param {Buffer} searchBuffer A buffer representing the RDN.
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* @param {number} startPos The position in the `searchBuffer` to start
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* searching from.
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*
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* @returns {number} The position of the end of the RDN's attribute type name,
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* or `-1` if an invalid character has been encountered.
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*/
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module.exports = function findNameEnd ({ searchBuffer, startPos }) {
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let pos = startPos
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while (pos < searchBuffer.byteLength) {
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const char = searchBuffer[pos]
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if (char === 0x20 || char === 0x3d) {
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// Name ends with a space or an '=' character.
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break
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}
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if (isValidNameChar(char) === true) {
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pos += 1
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continue
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}
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return -1
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}
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return pos
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}
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/**
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* Determine if a character is a valid `attributeType` character as defined
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* in RFC 4514 §3.
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*
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* @param {number} c The character to verify. Should be the byte representation
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* of the character from a {@link Buffer} instance.
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*
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* @returns {boolean}
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*/
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function isValidNameChar (c) {
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if (c >= 0x41 && c <= 0x5a) { // A - Z
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return true
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}
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if (c >= 0x61 && c <= 0x7a) { // a - z
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return true
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}
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if (c >= 0x30 && c <= 0x39) { // 0 - 9
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return true
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}
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if (c === 0x2d || c === 0x2e) { // - or .
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return true
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}
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return false
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}
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