Marc Mintel
5397309103
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48 lines
2.1 KiB
Plaintext
48 lines
2.1 KiB
Plaintext
// lib/types/utils.ts
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var decoder = new TextDecoder();
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var toUTF8String = (input, start = 0, end = input.length) => decoder.decode(input.slice(start, end));
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var toHexString = (input, start = 0, end = input.length) => input.slice(start, end).reduce((memo, i) => memo + `0${i.toString(16)}`.slice(-2), "");
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var getView = (input, offset) => new DataView(input.buffer, input.byteOffset + offset);
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var readInt16LE = (input, offset = 0) => getView(input, offset).getInt16(0, true);
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var readUInt16BE = (input, offset = 0) => getView(input, offset).getUint16(0, false);
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var readUInt16LE = (input, offset = 0) => getView(input, offset).getUint16(0, true);
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var readUInt24LE = (input, offset = 0) => {
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const view = getView(input, offset);
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return view.getUint16(0, true) + (view.getUint8(2) << 16);
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};
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var readInt32LE = (input, offset = 0) => getView(input, offset).getInt32(0, true);
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var readUInt32BE = (input, offset = 0) => getView(input, offset).getUint32(0, false);
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var readUInt32LE = (input, offset = 0) => getView(input, offset).getUint32(0, true);
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var readUInt64 = (input, offset, isBigEndian) => getView(input, offset).getBigUint64(0, !isBigEndian);
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var methods = {
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readUInt16BE,
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readUInt16LE,
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readUInt32BE,
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readUInt32LE
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};
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function readUInt(input, bits, offset = 0, isBigEndian = false) {
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const endian = isBigEndian ? "BE" : "LE";
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const methodName = `readUInt${bits}${endian}`;
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return methods[methodName](input, offset);
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}
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function readBox(input, offset) {
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if (input.length - offset < 4) return;
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const boxSize = readUInt32BE(input, offset);
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if (input.length - offset < boxSize) return;
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return {
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name: toUTF8String(input, 4 + offset, 8 + offset),
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offset,
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size: boxSize
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};
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}
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function findBox(input, boxName, currentOffset) {
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while (currentOffset < input.length) {
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const box = readBox(input, currentOffset);
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if (!box) break;
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if (box.name === boxName) return box;
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currentOffset += box.size > 0 ? box.size : 8;
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}
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}
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export { findBox, readInt16LE, readInt32LE, readUInt, readUInt16BE, readUInt16LE, readUInt24LE, readUInt32BE, readUInt32LE, readUInt64, toHexString, toUTF8String };
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