85 lines
2.6 KiB
TypeScript
85 lines
2.6 KiB
TypeScript
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import { logger } from "./logger.js";
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export type BytesLike = string | Uint8Array;
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export function isHexString(value: any, length?: number | boolean): value is string {
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if (typeof(value) !== "string" || !value.match(/^0x[0-9A-Fa-f]*$/)) {
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return false
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}
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if (typeof(length) === "number" && value.length !== 2 + 2 * length) { return false; }
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if (length === true && (value.length % 2) !== 0) { return false; }
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return true;
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}
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export function isBytesLike(value: any): value is BytesLike {
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return (isHexString(value, true) || (value instanceof Uint8Array));
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}
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const HexCharacters: string = "0123456789abcdef";
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export function hexlify(data: BytesLike): string {
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const bytes = logger.getBytes(data);
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let result = "0x";
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for (let i = 0; i < bytes.length; i++) {
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const v = bytes[i];
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result += HexCharacters[(v & 0xf0) >> 4] + HexCharacters[v & 0x0f];
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}
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return result;
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}
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export function concat(datas: ReadonlyArray<BytesLike>): string {
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return "0x" + datas.map((d) => hexlify(d).substring(2)).join("");
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}
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export function dataLength(data: BytesLike): number {
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if (isHexString(data, true)) { return (data.length - 2) / 2; }
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return logger.getBytes(data).length;
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}
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export function dataSlice(data: BytesLike, start?: number, end?: number): string {
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const bytes = logger.getBytes(data);
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if (end != null && end > bytes.length) { logger.throwError("cannot slice beyond data bounds", "BUFFER_OVERRUN", {
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buffer: bytes, length: bytes.length, offset: end
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}); }
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return hexlify(bytes.slice((start == null) ? 0: start, (end == null) ? bytes.length: end));
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}
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export function stripZerosLeft(data: BytesLike): string {
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let bytes = hexlify(data).substring(2);
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while (bytes.substring(0, 2) == "00") { bytes = bytes.substring(2); }
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return "0x" + bytes;
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}
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function zeroPad(data: BytesLike, length: number, left: boolean): string {
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const bytes = logger.getBytes(data);
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if (length < bytes.length) {
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logger.throwError("padding exceeds data length", "BUFFER_OVERRUN", {
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buffer: new Uint8Array(bytes),
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length: length,
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offset: length + 1
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});
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}
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const result = new Uint8Array(length);
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result.fill(0);
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if (left) {
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result.set(bytes, length - bytes.length);
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} else {
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result.set(bytes, 0);
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}
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return hexlify(result);
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}
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export function zeroPadValue(data: BytesLike, length: number): string {
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return zeroPad(data, length, true);
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}
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export function zeroPadBytes(data: BytesLike, length: number): string {
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return zeroPad(data, length, false);
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}
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