/proc/self/root/proc/self/root/var/runtime/node_modules/@aws-sdk/node_modules/mqtt-packet
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const max = 65536const cache = {} // in node 6 Buffer.subarray returns a Uint8Array instead of a Buffer// later versions return a Buffer// alternative is Buffer.slice but that creates a new buffer// creating new buffers takes time// SubOk is only false on node < 8const SubOk = Buffer.isBuffer(Buffer.from([1, 2]).subarray(0, 1)) function generateBuffer (i) { const buffer = Buffer.allocUnsafe(2) buffer.writeUInt8(i >> 8, 0) buffer.writeUInt8(i & 0x00FF, 0 + 1) return buffer} function generateCache () { for (let i = 0; i < max; i++) { cache[i] = generateBuffer(i) }} function genBufVariableByteInt (num) { const maxLength = 4 // max 4 bytes let digit = 0 let pos = 0 const buffer = Buffer.allocUnsafe(maxLength) do { digit = num % 128 | 0 num = num / 128 | 0 if (num > 0) digit = digit | 0x80 buffer.writeUInt8(digit, pos++) } while (num > 0 && pos < maxLength) if (num > 0) { pos = 0 } return SubOk ? buffer.subarray(0, pos) : buffer.slice(0, pos)} function generate4ByteBuffer (num) { const buffer = Buffer.allocUnsafe(4) buffer.writeUInt32BE(num, 0) return buffer} module.exports = { cache, generateCache, generateNumber: generateBuffer, genBufVariableByteInt, generate4ByteBuffer}