43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
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import {
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Token,
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Type
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} from './token.js';
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import {
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assertEnoughData,
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decodeErrPrefix
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} from './common.js';
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import * as uint from './0uint.js';
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import { encodeBytes } from './2bytes.js';
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import {
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toString,
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slice
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} from './byte-utils.js';
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function toToken(data, pos, prefix, length, options) {
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const totLength = prefix + length;
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assertEnoughData(data, pos, totLength);
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const tok = new Token(Type.string, toString(data, pos + prefix, pos + totLength), totLength);
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if (options.retainStringBytes === true) {
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tok.byteValue = slice(data, pos + prefix, pos + totLength);
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}
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return tok;
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}
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export function decodeStringCompact(data, pos, minor, options) {
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return toToken(data, pos, 1, minor, options);
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}
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export function decodeString8(data, pos, _minor, options) {
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return toToken(data, pos, 2, uint.readUint8(data, pos + 1, options), options);
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}
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export function decodeString16(data, pos, _minor, options) {
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return toToken(data, pos, 3, uint.readUint16(data, pos + 1, options), options);
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}
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export function decodeString32(data, pos, _minor, options) {
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return toToken(data, pos, 5, uint.readUint32(data, pos + 1, options), options);
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}
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export function decodeString64(data, pos, _minor, options) {
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const l = uint.readUint64(data, pos + 1, options);
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if (typeof l === 'bigint') {
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throw new Error(`${ decodeErrPrefix } 64-bit integer string lengths not supported`);
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}
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return toToken(data, pos, 9, l, options);
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}
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export const encodeString = encodeBytes;
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