Samuel Kent
29 lines
869 B
JavaScript
29 lines
869 B
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.FourCcToken = void 0;
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const util = require("./Util");
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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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exports.FourCcToken = {
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len: 4,
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get: (buf, off) => {
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const id = buf.toString('binary', off, off + exports.FourCcToken.len);
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switch (id) {
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default:
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if (!id.match(validFourCC)) {
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throw new Error(`FourCC contains invalid characters: ${util.a2hex(id)} "${id}"`);
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}
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}
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return id;
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},
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put: (buffer, offset, id) => {
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const str = Buffer.from(id, 'binary');
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if (str.length !== 4)
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throw new Error("Invalid length");
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return str.copy(buffer, offset);
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}
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};
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