Borewit
32 lines
952 B
TypeScript
32 lines
952 B
TypeScript
import type { IToken } from 'strtok3';
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import { latin1toString, latin1fromString } from '@exodus/bytes/single-byte.js';
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import * as util from './Util.js';
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import { InternalParserError, FieldDecodingError } from '../ParseError.js';
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const validFourCC = /^[\x21-\x7e©][\x20-\x7e\x00()]{3}/;
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/**
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* Token for read FourCC
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* Ref: https://en.wikipedia.org/wiki/FourCC
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*/
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export const FourCcToken: IToken<string> = {
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len: 4,
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get: (buf: Uint8Array, off: number): string => {
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const id = latin1toString(buf.subarray(off, off + FourCcToken.len));
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if (!id.match(validFourCC)) {
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throw new FieldDecodingError(`FourCC contains invalid characters: ${util.a2hex(id)} "${id}"`);
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}
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return id;
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},
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put: (buffer: Uint8Array, offset: number, id: string) => {
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const str = latin1fromString(id);
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if (str.length !== 4)
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throw new InternalParserError('Invalid length');
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buffer.set(str, offset);
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return offset + 4;
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}
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};
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