[bradvido88]

In developing some supplemental tools for XBMC, I found I had to hash strings often when dealing with the Thumbnails directory.
XBMC provides a good example in the Wiki. But if you are developing in a different language, you need to know that the hashes you are generating are the same as what XBMC would generate.

For anyone who needs to quickly test hashes against XBMC's C# hashing function, use this quick tester I compiled. It provides the exact hash from XBMC's code.

Download it here
Usage: either provide the strings to be hashed as command-line parameters, or enter them line-by-line once the program starts
Requirements: .NET Framework 3.5

Here is the source code for the hashing function at the time this program was created:

Code:

public static string Hash(string input)
    {
        char[] chars = input.ToCharArray();
        for (int index = 0; index < chars.Length; index++)
        {
            if (chars[index] <= 127)
            {
                chars[index] = System.Char.ToLowerInvariant(chars[index]);
            }
        }
        input = new string(chars);
        uint m_crc = 0xffffffff;
        byte[] bytes = System.Text.Encoding.UTF8.GetBytes(input);
        foreach (byte myByte in bytes)
        {
            m_crc ^= ((uint)(myByte) << 24);
            for (int i = 0; i < 8; i++)
            {
                if ((System.Convert.ToUInt32(m_crc) & 0x80000000) == 0x80000000)
                {
                    m_crc = (m_crc << 1) ^ 0x04C11DB7;
                }
                else
                {
                    m_crc <<= 1;
                }
            }
        }
        return String.Format("{0:x8}", m_crc);
    }