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0812cafd55
* Improve mesh media throughput * Reserve media slots atomically * Prioritize small fragment trains --------- Co-authored-by: jack <jackjackbits@users.noreply.github.com>
26 lines
1.2 KiB
Swift
26 lines
1.2 KiB
Swift
import Foundation
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/// Centralized thresholds for Bluetooth file transfers to keep payload sizes sane on constrained radios.
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enum FileTransferLimits {
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/// Absolute ceiling enforced for any file payload (voice, image, other).
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static let maxPayloadBytes: Int = 1 * 1024 * 1024 // 1 MiB
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/// Voice notes stay small for low-latency relays.
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static let maxVoiceNoteBytes: Int = 512 * 1024 // 512 KiB
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/// Compressed images after downscaling should comfortably fit under this budget.
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static let maxImageBytes: Int = 512 * 1024 // 512 KiB
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/// Worst-case size once TLV metadata and binary packet framing are included for the largest payloads.
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static let maxFramedFileBytes: Int = {
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let maxMetadataBytes = Int(UInt16.max) * 2 // fileName + mimeType TLVs
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let tlvEnvelopeOverhead = 18 + maxMetadataBytes // TLV tags + lengths + metadata bytes
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let binaryEnvelopeOverhead = BinaryProtocol.v2HeaderSize
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+ BinaryProtocol.senderIDSize
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+ BinaryProtocol.recipientIDSize
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+ BinaryProtocol.signatureSize
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return maxPayloadBytes + tlvEnvelopeOverhead + binaryEnvelopeOverhead
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}()
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static func isValidPayload(_ size: Int) -> Bool {
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size <= maxPayloadBytes
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}
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}
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