Borewit
38 lines
960 B
TypeScript
38 lines
960 B
TypeScript
import * as Token from 'token-types';
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import { TextDecoder } from '@exodus/bytes/encoding.js';
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export class VorbisDecoder {
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private readonly data: Uint8Array;
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private offset: number;
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constructor(data: Uint8Array, offset: number) {
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this.data = data;
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this.offset = offset;
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}
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public readInt32(): number {
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const value = Token.UINT32_LE.get(this.data, this.offset);
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this.offset += 4;
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return value;
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}
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public readStringUtf8(): string {
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const len = this.readInt32();
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const value = new TextDecoder().decode(this.data.subarray(this.offset, this.offset + len));
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this.offset += len;
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return value;
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}
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public parseUserComment(): {key: string, value: string, len: number} {
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const offset0 = this.offset;
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const v = this.readStringUtf8();
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const idx = v.indexOf('=');
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return {
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key: v.substring(0, idx).toUpperCase(),
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value: v.substring(idx + 1),
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len: this.offset - offset0
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};
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}
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}
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