Editing Alias (Mac OS) (section)

=== Alias record structure outside of size length ===
The following is for use with the Apple's Alias Resource Manager.
# 4 bytes resource type name = long ASCII text string
# 2 bytes resource ID = short integer value
# 2 bytes resource end pad = short value set to zero

'''Java code to flag an alias file'''
<syntaxhighlight lang="java">
// This function checks whether a file matches the alias magic number.
public static boolean checkForMacAliasFile(File inputFile) throws FileNotFoundException, IOException {

    // Only files can be aliases.
    // Do not test directories; they will be false.
    if (inputFile.isFile()) {
        byte[] bookmark = new byte[] {
            0x62, 0x6F, 0x6F, 0x6B, 0x00, 0x00, 0x00, 0x00, 0x6D, 0x61, 0x72, 0x6B, 0x00, 0x00, 0x00, 0x00
        };
        long length = inputFile.length();
        if (length > 16) {
            byte[] result = new byte[16];
            FileInputStream fis = new FileInputStream(inputFile);
            fis.read(result);
            fis.close();
            return Arrays.equals(result, bookmark);
        }
    }

    return false;
}
</syntaxhighlight>

There is a [https://github.com/davecotter/cftest/blob/main/source/shared/MacAlias.cpp github repo with working C++ code here].