38 lines
1.2 KiB
Swift
38 lines
1.2 KiB
Swift
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import Foundation
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public enum OffloadError: Error, Equatable {
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case fileNotFound(String)
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case readFailed(String)
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case writeFailed(String)
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case verifyFailed(path: String, expected: String, actual: String)
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case destinationConflict(String)
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}
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/// Chunked file hashing — constant memory over multi-GB camera files.
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public enum FileHasher {
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static let chunkSize = 4 * 1024 * 1024
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public static func xxh64(path: String) throws -> String {
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var hasher = XXHash64()
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try stream(path: path) { hasher.update($0) }
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return XXHash64.hexString(hasher.finalize())
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}
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public static func md5(path: String) throws -> String {
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var hasher = MD5()
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try stream(path: path) { hasher.update($0) }
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return hasher.finalize().map { String(format: "%02x", $0) }.joined()
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}
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private static func stream(path: String, _ body: (Data) -> Void) throws {
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guard let handle = FileHandle(forReadingAtPath: path) else {
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throw OffloadError.fileNotFound(path)
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}
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defer { try? handle.close() }
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while true {
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guard let chunk = try handle.read(upToCount: chunkSize), !chunk.isEmpty else { break }
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body(chunk)
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}
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}
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}
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