67 lines
2.1 KiB
Swift
67 lines
2.1 KiB
Swift
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import Foundation
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/// Checksum algorithms supported for offload/MHL. Element names match
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/// ASC MHL v2.0 spec hash-element vocabulary.
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public enum HashAlgorithm: String, Sendable, CaseIterable {
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case xxh64
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case xxh3
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case xxh128
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case md5
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case sha1
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public var mhlElement: String {
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rawValue
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}
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/// In-memory one-shot (test/reference path).
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public static func hashInMemory(_ data: Data, algorithm: HashAlgorithm) -> String {
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switch algorithm {
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case .xxh64:
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return XXHash64.hexString(XXHash64.hash(data))
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case .xxh3:
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return XXH3.hexString64(XXH3.hash64(data))
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case .xxh128:
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return XXH3.hash128(data).hexString
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case .md5:
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return MD5.hexString(data)
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case .sha1:
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return SHA1.hexString(data)
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}
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}
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}
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extension FileHasher {
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/// Chunked file hash with algorithm dispatch.
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public static func hash(path: String, algorithm: HashAlgorithm) throws -> String {
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switch algorithm {
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case .xxh64:
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return try xxh64(path: path)
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case .md5:
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return try md5(path: path)
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case .xxh3:
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let s = XXH3.Streaming(bits: .h64)
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try streamFile(path: path) { s.update($0) }
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return XXH3.hexString64(s.digest64())
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case .xxh128:
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let s = XXH3.Streaming(bits: .h128)
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try streamFile(path: path) { s.update($0) }
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return s.digest128().hexString
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case .sha1:
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var sha = SHA1()
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try streamFile(path: path) { sha.update($0) }
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return sha.finalize().map { String(format: "%02x", $0) }.joined()
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}
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}
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static func streamFile(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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