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* Converts a buffer containing an IPv6 address into string notation.
* String notation consists of 8 sets of 16-bits each. Each group is
* written as four hexadecimal values separated by colons (:). This method
* follows RFC 5952 shortening.
*
* @remarks
* RFC 5952 https://tools.ietf.org/html/rfc5952
*
* The following shortening rules are applied:
* 1. Leading zeros are shorted as much as possible
* 2. Zero compression is from left to right and
* 3. Addresses are returned in lowercase.
*/
export function ipv6StringFromBuffer(buffer: Buffer): string {
const sections = getHexSections(buffer);
const result = sectionsToString(sections);
return result;
}
function getHexSections(buffer: Buffer): string[] {
const bytesPerSection = 2;
const sections: string[] = [];
for (let i = 0; i < buffer.length; i += bytesPerSection) {
let section = buffer.slice(i, i + bytesPerSection).toString('hex');
section = discardLeadingZeros(section);
sections.push(section);
}
return sections;
}
function discardLeadingZeros(section: string): string {
return section.replace(/^0+/g, '');
}
function sectionsToString(sections: string[]): string {
let result = '';
let hasCollapsed = false;
for (const s of sections) {
// alrerady in collapse state, no-op
if (result.endsWith('::') && s === '') continue;
// collapse zero section
if (s === '' && !hasCollapsed) {
hasCollapsed = true;
if (result === '') result += '::';
else result += ':';
continue;
}
// we have a zero, but already collapsed so we need to mark as zero
if (hasCollapsed && s === '') {
result += '0:';
continue;
}
// normal condition
result += s + ':';
}
// remove trailing except with ending with ::;
if (!result.endsWith('::')) result = result.slice(0, -1);
return result;
}
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