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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | 1x 1x 15x 9x 15x 15x 15x 15x 15x 97x 8x 8x 8x 89x 89x 15x 89x | import { BufferWriter } from '@node-dlc/bufio';
/**
* Converts an IPv6 address in string notation to the
* byte representation.
*/
export function ipv6StringToBuffer(host: string): Buffer {
// replace start or end expansion with single part to retain correct
// number of parts (8) that are used in the remainder of the logic.
// ie: ::1:2:3:4:5:6:7 would split to ['','',1,2,3,4,5,6,7] and
// result in overflows
if (host.startsWith('::')) host = host.substr(1);
else if (host.endsWith('::')) host = host.substr(0, host.length - 1);
const parts = host.split(':');
const writer = new BufferWriter(Buffer.alloc(16));
const expandBy = 8 - parts.length;
let needsExpansion = expandBy > 0;
for (const part of parts) {
if (needsExpansion && part === '') {
const b = Buffer.alloc((expandBy + 1) * 2);
writer.writeBytes(b);
needsExpansion = false;
} else {
const b = Buffer.from(expandZeros(part), 'hex');
writer.writeBytes(b);
}
}
return writer.toBuffer();
}
function expandZeros(part: string): string {
return part.padStart(4, '0');
}
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