Git Hash Tests

HashingTests.cs

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using NUnit.Framework;

namespace GitHash.Tests
{
  [TestFixture]
  public class HashingTests
  {
    [Test]
    public void Test()
    {
      var info = new FileInfo("../../test.txt");

      var data = info.OpenText().ReadToEnd().Replace("\r\n", "\n");

      using (var hasher = new SHA1Managed())
      using (var stream = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write))
      {
        Write(stream, "blob {0}", data.Length);
        Write(stream, (byte) 0);
        Write(stream, data);

        stream.FlushFinalBlock();

        var buffer = new StringBuilder();

        foreach (var b in hasher.Hash)
        {
          buffer.Append(b.ToString("x2"));
        }

        Console.Out.WriteLine(buffer);
      }
      
      
    }

    private void Write(Stream stream, Stream input)
    {
      var buffer = new byte[32768];
      int read;
      while ((read = input.Read(buffer, 0, buffer.Length)) > 0) {
        stream.Write(buffer, 0, read);
      }
    }

    private void Write(Stream stream, byte b)
    {
      stream.WriteByte(b);
    }

    private void Write(Stream stream, string format, params object[] args)
    {
      if (args != null && args.Length > 0)
      {
        format = string.Format(format, args);
      }

      var buffer = Encoding.UTF8.GetBytes(format);

      stream.Write(buffer, 0, buffer.Length);
    }
  }
}