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313cb5d213
Add "Save File" and "Save Content JSON" options to profile share menu, allowing users to save profiles directly to a chosen location using fileExporter instead of the system share sheet.
29 lines
754 B
Swift
29 lines
754 B
Swift
import Foundation
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enum CRC32 {
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private static let table: [UInt32] = {
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var table = [UInt32](repeating: 0, count: 256)
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for i in 0 ..< 256 {
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var crc = UInt32(i)
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for _ in 0 ..< 8 {
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if crc & 1 != 0 {
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crc = (crc >> 1) ^ 0xEDB8_8320
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} else {
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crc = crc >> 1
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}
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}
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table[i] = crc
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}
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return table
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}()
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static func checksum(_ data: Data, k: Int) -> UInt32 {
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var crc: UInt32 = 0xFFFF_FFFF
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for byte in data {
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let index = Int((crc ^ UInt32(byte)) & 0xFF)
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crc = (crc >> 8) ^ table[index]
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}
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return crc ^ UInt32(k) ^ 0xFFFF_FFFF
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}
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}
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