Eric Doughty-Papassideris
47 lines
1.7 KiB
TypeScript
47 lines
1.7 KiB
TypeScript
export function compareTimeuuid(a?: string, b?: string): number {
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return timeuuidToDate(a || "") - timeuuidToDate(b || "");
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}
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export function timeuuidToDate(time_str: string): number {
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if (!time_str) {
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return 0;
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}
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const uuid_arr = time_str.split("-");
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const time_string = [uuid_arr[2].substring(1), uuid_arr[1], uuid_arr[0]].join("");
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return parseInt(time_string, 16);
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}
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/** Remove `-`s from a formatted UUID to get a hex a string */
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export function hexFromFormatted(uuid: string) {
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const result = uuid.replace(/-+/g, "");
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if (result.length !== 32)
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throw new Error(`Invalid UUID (${JSON.stringify(uuid)}). Wrong number of digits`);
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return result;
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}
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/** Add `-`s back in a hex string to make a formatted UUID */
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export function formattedFromHex(hex: string) {
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const idMatch = hex.match(
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/^([a-z0-f]{8})([a-z0-f]{4})([a-z0-f]{4})([a-z0-f]{4})([a-z0-f]{12})$/i,
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);
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if (!idMatch)
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throw new Error(`Invalid UUID hex (${JSON.stringify(hex)}). Wrong number of digits`);
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const [, ...parts] = idMatch;
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return parts.join("-");
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}
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/** Convert a UUID formatted or hex string into a binary buffer */
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export function bufferFromUUIDString(uuidOrHex: string) {
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return Buffer.from(hexFromFormatted(uuidOrHex), "hex");
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}
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/** In a buffer with concatenated UUIDs in binary, extract the `index`th and return as formatted UUID */
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export function formattedUUIDInBufferArray(buffer: Buffer, index: number) {
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if (buffer.length < (index + 1) * 16)
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throw new Error(`Cannot get UUID ${JSON.stringify(index)} because the buffer is too small`);
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const slice = buffer.subarray(index * 16, (index + 1) * 16);
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return formattedFromHex(slice.toString("hex").toLowerCase());
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}
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