@tf2pickup-org/mumble-client/dist/read-varint.js

A simple bot for managing mumble servers

export function readVarint(buffer) {
    if (buffer.length === 0) {
        throw new Error(`buffer is empty`);
    }
    switch (true) {
        case (0b10000000 & buffer[0]) === 0:
            return { value: buffer.readUInt8(0), length: 1 };
        case (0b11000000 & buffer[0]) === 0b10000000:
            return { value: buffer.readUint16BE(0) & 0x3fff, length: 2 };
        case (0b11100000 & buffer[0]) === 0b11000000:
            return {
                value: ((buffer.readUint16BE(0) & 0x1fff) << 8) | buffer.readUint8(2),
                length: 3,
            };
        case (0b11110000 & buffer[0]) === 0b11100000:
            return {
                value: buffer.readUint32BE(0) & 0x1fffffff,
                length: 4,
            };
        case (0b11111100 & buffer[0]) === 0b11110000:
            return {
                value: buffer.readUint32BE(1),
                length: 5,
            };
        case (0b11111100 & buffer[0]) === 0b11110100:
            return {
                value: buffer.readBigInt64BE(1),
                length: 9,
            };
        case (0b11111100 & buffer[0]) === 0b11111000: {
            const { value, length } = readVarint(buffer.subarray(1));
            return {
                value: -value,
                length: length + 1,
            };
        }
        case (0b11111100 & buffer[0]) === 0b11111100:
            return {
                value: ~(buffer.readUint8(0) & 0x00000011),
                length: 1,
            };
        default:
            throw new Error(`varint not supported`);
    }
}
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