How to convert a classic HFS path into a POSIX path

Question

I am reading old files that still use HFS style paths, such as VolumeName:Folder:File.

I need to convert them into POSIX paths.

I do not like to

Answer 1

A solution in Obj-C and Swift as category / extension of NSString / String. The unavailable kCFURLHFSPathStyle style is circumvented in the same way as in the linked question.

Objective-C

@implementation NSString (POSIX_HFS)

    - (NSString *)POSIXPathFromHFSPath
    {
        NSString *posixPath = nil;
        CFURLRef fileURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, (CFStringRef)self, 1, [self hasSuffix:@":"]); // kCFURLHFSPathStyle
        if (fileURL)    {
            posixPath = [(__bridge NSURL*)fileURL path];
            CFRelease(fileURL);
        }

        return posixPath;
    }

@end

Swift

extension String {

    func posixPathFromHFSPath() -> String?
    {
        guard let fileURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault,
                                                          self as CFString?,
                                                          CFURLPathStyle(rawValue:1)!,
                                                          self.hasSuffix(":")) else { return nil }
        return (fileURL as URL).path
    }
}