/// <summary>
/// ハッシュを生成する
/// </summary>
/// <param name="buffer">ハッシュ値を計算するbyte配列</param>
public static byte[] ComputeHash(byte[] buffer)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
return(T_Crc32_Castagnoli.ComputeHash(buffer, 0, buffer.Length));
}
public static byte[] ComputeHash(ArraySegment <byte> value)
{
if (value.Array == null)
{
throw new ArgumentNullException("value");
}
return(T_Crc32_Castagnoli.ComputeHash(value.Array, value.Offset, value.Count));
}
public void Crc32_Castagnoli()
{
Random random = new Random();
Stopwatch sw1 = new Stopwatch();
Stopwatch sw2 = new Stopwatch();
var flags = new int[] { 0, 1 };
var length = 1024;
byte[] value = new byte[length];
for (int i = 0; i < 1024 * 1024; i++)
{
byte[] result1 = null;
byte[] result2 = null;
random.Shuffle(flags);
foreach (var index in flags)
{
if (index == 0)
{
sw1.Start();
result1 = Library.Security.Crc32_Castagnoli.ComputeHash(value, 0, length);
sw1.Stop();
}
else if (index == 1)
{
sw2.Start();
result2 = T_Crc32_Castagnoli.ComputeHash(value, 0, length);
sw2.Stop();
}
}
Assert.IsTrue(Unsafe.Equals(result1, result2));
}
StringBuilder sb = new StringBuilder();
sb.AppendLine("Native Crc32_Castagnoli: " + sw1.Elapsed.ToString());
sb.AppendLine("Managed Crc32_Castagnoli: " + sw2.Elapsed.ToString());
Console.WriteLine(sb.ToString());
}
public void Test_Crc32_Castagnoli()
{
byte[] buffer = new byte[1024 * 32];
_random.NextBytes(buffer);
Assert.IsTrue(CollectionUtilities.Equals(T_Crc32_Castagnoli.ComputeHash(buffer), Crc32_Castagnoli.ComputeHash(buffer)));
using (MemoryStream stream1 = new MemoryStream(buffer))
using (MemoryStream stream2 = new MemoryStream(buffer))
{
Assert.IsTrue(CollectionUtilities.Equals(T_Crc32_Castagnoli.ComputeHash(stream1), Crc32_Castagnoli.ComputeHash(stream2)));
}
var list = new List <ArraySegment <byte> >();
list.Add(new ArraySegment <byte>(buffer));
list.Add(new ArraySegment <byte>(buffer));
list.Add(new ArraySegment <byte>(buffer));
list.Add(new ArraySegment <byte>(buffer));
Assert.IsTrue(CollectionUtilities.Equals(T_Crc32_Castagnoli.ComputeHash(list), Crc32_Castagnoli.ComputeHash(list)));
}
