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dynamic fragmentation

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This commit is contained in:
callebtc
2026-01-09 22:54:03 +07:00
parent 3c7e14f49d
commit 90b134186b
1 changed files with 17 additions and 2 deletions
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bitchat/Services/BLE/BLEService.swift
+17 -2
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@@ -17,7 +17,7 @@ final class BLEService: NSObject {
// MARK: - Constants // MARK: - Constants
#if DEBUG #if DEBUG
static let serviceUUID = CBUUID(string: "F47B5E2D-4A9E-4C5A-9B3F-8E1D2C3A4B5A") // testnet static let serviceUUID = CBUUID(string: "F47B5E2D-4A9E-4C5A-9B3F-8E1D2C3A4B5C") // testnet
#else #else
static let serviceUUID = CBUUID(string: "F47B5E2D-4A9E-4C5A-9B3F-8E1D2C3A4B5C") // mainnet static let serviceUUID = CBUUID(string: "F47B5E2D-4A9E-4C5A-9B3F-8E1D2C3A4B5C") // mainnet
#endif #endif
@@ -3015,7 +3015,21 @@ extension BLEService {
} }
// Fragment the unpadded frame; each fragment will be encoded independently // Fragment the unpadded frame; each fragment will be encoded independently
let fragmentID = Data((0..<8).map { _ in UInt8.random(in: 0...255) }) let fragmentID = Data((0..<8).map { _ in UInt8.random(in: 0...255) })
let chunk = context.maxChunk ?? defaultFragmentSize // Dynamic Fragment Sizing (Source Routing v2)
// See docs/SOURCE_ROUTING.md Section 5.1
var fragmentVersion: UInt8 = 1
var calculatedChunk = defaultFragmentSize
if let route = packet.route, !route.isEmpty {
fragmentVersion = 2
// RouteSize = 1 + (Hops * 8)
let routeSize = 1 + (route.count * 8)
// Overhead = HeaderV2(16) + SenderID(8) + RecipientID(8) + RouteSize + FragmentHeader(13) + PaddingBuffer(16)
let overhead = 16 + 8 + 8 + routeSize + 13 + 16
calculatedChunk = 512 - overhead
}
let chunk = context.maxChunk ?? calculatedChunk
let safeChunk = max(64, chunk) let safeChunk = max(64, chunk)
let fragments = stride(from: 0, to: fullData.count, by: safeChunk).map { offset in let fragments = stride(from: 0, to: fullData.count, by: safeChunk).map { offset in
Data(fullData[offset..<min(offset + safeChunk, fullData.count)]) Data(fullData[offset..<min(offset + safeChunk, fullData.count)])
@@ -3074,6 +3088,7 @@ extension BLEService {
payload: payload, payload: payload,
signature: nil, signature: nil,
ttl: packet.ttl, ttl: packet.ttl,
version: fragmentVersion,
route: packet.route route: packet.route
) )