Justinas Delinda
42 lines
1011 B
TypeScript
42 lines
1011 B
TypeScript
import * as Token from 'token-types';
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import type { IGetToken } from 'strtok3';
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import type { IChunkHeader } from '../iff/index.js';
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export type { IChunkHeader } from '../iff/index.js';
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/**
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* Common RIFF chunk header
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*/
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export const Header: IGetToken<IChunkHeader> = {
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len: 8,
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get: (buf: Uint8Array, off): IChunkHeader => {
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return {
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// Group-ID
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chunkID: new Token.StringType(4, 'latin1').get(buf, off),
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// Size
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chunkSize: Token.UINT32_LE.get(buf, off + 4)
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};
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}
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};
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/**
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* Token to parse RIFF-INFO tag value
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*/
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export class ListInfoTagValue implements IGetToken<string> {
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public len: number;
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private tagHeader: IChunkHeader;
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public constructor(tagHeader: IChunkHeader) {
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this.tagHeader = tagHeader;
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this.len = tagHeader.chunkSize;
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this.len += this.len & 1; // if it is an odd length, round up to even
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}
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public get(buf: Uint8Array, off: number): string {
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return new Token.StringType(this.tagHeader.chunkSize, 'ascii').get(buf, off);
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}
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}
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