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using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Globalization;
internal class DigestComparer : IComparer<byte[]>, IEqualityComparer<byte[]>
{
int IComparer<byte[]>.Compare(byte[] digest1, byte[] digest2)
{
Debug.Assert(digest1.Length == 16 && digest2.Length == 16, "Invalid digest!");
for (int index = 0; index < 16; index++)
if (digest1[index] != digest2[index])
return (digest1[index] < digest2[index]) ? -1 : 1;
return 0;
}
bool IEqualityComparer<byte[]>.Equals(byte[] digest1, byte[] digest2)
{
Debug.Assert(digest1.Length == 16 && digest2.Length == 16, "Invalid digest!");
for (int index = 0; index < 16; index++)
if (digest1[index] != digest2[index])
return false;
return true;
}
int IEqualityComparer<byte[]>.GetHashCode(byte[] checksumBytes)
{
return GetMD5DigestString(checksumBytes).GetHashCode();
}
internal static string GetMD5DigestString(byte[] md5Digest)
{
return string.Format(CultureInfo.InvariantCulture, "{0}{1}{2}{3}{4}{5}{6}{7}{8}{9}{10}{11}{12}{13}{14}{15}", md5Digest[0].ToString("X2", CultureInfo.InvariantCulture), md5Digest[1].ToString("X2", CultureInfo.InvariantCulture), md5Digest[2].ToString("X2", CultureInfo.InvariantCulture), md5Digest[3].ToString("X2", CultureInfo.InvariantCulture), md5Digest[4].ToString("X2", CultureInfo.InvariantCulture), md5Digest[5].ToString("X2", CultureInfo.InvariantCulture), md5Digest[6].ToString("X2", CultureInfo.InvariantCulture), md5Digest[7].ToString("X2", CultureInfo.InvariantCulture), md5Digest[8].ToString("X2", CultureInfo.InvariantCulture), md5Digest[9].ToString("X2", CultureInfo.InvariantCulture), md5Digest[10].ToString("X2", CultureInfo.InvariantCulture), md5Digest[11].ToString("X2", CultureInfo.InvariantCulture), md5Digest[12].ToString("X2", CultureInfo.InvariantCulture), md5Digest[13].ToString("X2", CultureInfo.InvariantCulture), md5Digest[14].ToString("X2", CultureInfo.InvariantCulture), md5Digest[15].ToString("X2", CultureInfo.InvariantCulture));
}
}
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