Kingfisher/Sources/Utility/String+MD5.swift

//
//  String+MD5.swift
//  Kingfisher
//
//  Created by Wei Wang on 18/09/25.
//
//  Copyright (c) 2019 Wei Wang <onevcat@gmail.com>
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.

import Foundation
import CommonCrypto

extension String: KingfisherCompatibleValue { }
extension KingfisherWrapper where Base == String {
    var md5: String {
        guard let data = base.data(using: .utf8) else {
            return base
        }
        var digest = [UInt8](repeating: 0, count: Int(CC_MD5_DIGEST_LENGTH))
        #if swift(>=5.0)
        _ = data.withUnsafeBytes { (bytes: UnsafeRawBufferPointer) in
            return CC_MD5(bytes.baseAddress, CC_LONG(data.count), &digest)
        }
        #else
        _ = data.withUnsafeBytes { bytes in
            return CC_MD5(bytes, CC_LONG(data.count), &digest)
        }
        #endif
        
        return digest.reduce(into: "") { $0 += String(format: "%02x", $1) }
    }
}