mirror of
https://github.com/jwetzell/rttrp-js.git
synced 2026-09-08 15:49:03 +00:00
46 lines
1.2 KiB
TypeScript
46 lines
1.2 KiB
TypeScript
const HEADER_SIZE = 18;
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export default (
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floatSignature: number,
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version: number,
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packetID: number,
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packetFormat: number,
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context: number,
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subModules: Uint8Array[],
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isLittleEndian: boolean = false
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): Uint8Array => {
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if (version !== 2) {
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throw new Error('Only version 2 of the RTTrP header is currently supported');
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}
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const bytes = new Uint8Array(HEADER_SIZE);
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let totalPacketSize = bytes.byteLength;
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subModules.forEach((subModule) => {
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totalPacketSize += subModule.length;
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});
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const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
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let dataOffset = 0;
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view.setUint16(dataOffset, 0x4154, isLittleEndian);
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dataOffset += 2;
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view.setUint16(dataOffset, floatSignature, isLittleEndian);
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dataOffset += 2;
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view.setUint16(dataOffset, version);
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dataOffset += 2;
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view.setUint32(dataOffset, packetID, isLittleEndian);
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dataOffset += 4;
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view.setUint8(dataOffset, packetFormat);
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dataOffset += 1;
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view.setUint16(dataOffset, totalPacketSize, isLittleEndian);
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dataOffset += 2;
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view.setUint32(dataOffset, context, isLittleEndian);
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dataOffset += 4;
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view.setUint8(dataOffset, subModules.length);
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dataOffset += 1;
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return bytes;
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};
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