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123 lines (110 loc) · 3.51 KB
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using System;
using System.Linq;
using System.Text;
using NUnit.Framework;
#if !NETCORE
using E = Crc32.Crc32Algorithm;
#endif
namespace Force.Crc32.Tests
{
[TestFixture]
public class ImplementationTest
{
#if !NETCORE
[TestCase("Hello", 3)]
[TestCase("Nazdar", 0)]
[TestCase("Ahoj", 1)]
[TestCase("Very long text.Very long text.Very long text.Very long text.Very long text.Very long text.Very long text", 0)]
[TestCase("Very long text.Very long text.Very long text.Very long text.Very long text.Very long text.Very long text", 3)]
public void ResultConsistency(string text, int offset)
{
var bytes = Encoding.ASCII.GetBytes(text);
var crc1 = E.Compute(bytes.Skip(offset).ToArray());
var crc2 = Crc32Algorithm.Append(0, bytes, offset, bytes.Length - offset);
Assert.That(crc2, Is.EqualTo(crc1));
}
#endif
[Test]
public void ResultConsistency2()
{
Assert.That(Crc32Algorithm.Compute(new byte[] { 1 }), Is.EqualTo(2768625435));
Assert.That(Crc32Algorithm.Compute(new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }), Is.EqualTo(622876539));
}
#if !NETCORE
[Test]
public void ResultConsistencyAsHashAlgorithm()
{
var bytes = new byte[30000];
new Random().NextBytes(bytes);
var e = new E();
var c = new Crc32Algorithm();
var crc1 = BitConverter.ToInt32(e.ComputeHash(bytes), 0);
var crc2 = BitConverter.ToInt32(c.ComputeHash(bytes), 0);
Console.WriteLine(crc1.ToString("X8"));
Console.WriteLine(crc2.ToString("X8"));
Assert.That(crc1, Is.EqualTo(crc2));
}
#endif
[Test]
public void PartIsWhole()
{
var bytes = new byte[30000];
new Random().NextBytes(bytes);
var r1 = Crc32Algorithm.Append(0, bytes, 0, 15000);
var r2 = Crc32Algorithm.Append(r1, bytes, 15000, 15000);
var r3 = Crc32Algorithm.Append(0, bytes, 0, 30000);
Assert.That(r2, Is.EqualTo(r3));
}
[Test]
public void Result_Is_BigEndian()
{
var bytes = new byte[30000];
new Random().NextBytes(bytes);
var crc1 = Crc32Algorithm.Append(0, bytes, 0, bytes.Length);
var crc2Bytes = new Crc32Algorithm().ComputeHash(bytes);
if (BitConverter.IsLittleEndian) crc2Bytes = crc2Bytes.Reverse().ToArray();
var crc2 = BitConverter.ToUInt32(crc2Bytes, 0);
Assert.That(crc2, Is.EqualTo(crc1));
}
[Test]
public void Result_Is_LittleEndian_IF_Specified()
{
var bytes = new byte[30000];
new Random().NextBytes(bytes);
var crc1 = Crc32Algorithm.Append(0, bytes, 0, bytes.Length);
var crc2Bytes = new Crc32Algorithm(false).ComputeHash(bytes);
if (!BitConverter.IsLittleEndian) crc2Bytes = crc2Bytes.Reverse().ToArray();
var crc2 = BitConverter.ToUInt32(crc2Bytes, 0);
Assert.That(crc2, Is.EqualTo(crc1));
}
[Test]
[TestCase(0)]
[TestCase(1)]
[TestCase(2)]
[TestCase(3)]
[TestCase(4)]
[TestCase(5)]
[TestCase(11)]
[TestCase(30)]
[TestCase(200)]
[TestCase(10000)]
public void Computation_With_Crc_End_Should_Be_Validated(int length)
{
var buf = new byte[length + 4];
var r = new Random();
r.NextBytes(buf);
Crc32Algorithm.ComputeAndWriteToEnd(buf);
Assert.That(Crc32Algorithm.IsValidWithCrcAtEnd(buf), Is.True);
buf[r.Next(buf.Length)] ^= 0x1;
Assert.That(Crc32Algorithm.IsValidWithCrcAtEnd(buf), Is.False);
// partial test
if (length > 2)
{
Crc32Algorithm.ComputeAndWriteToEnd(buf, 1, length - 2);
Assert.That(Crc32Algorithm.IsValidWithCrcAtEnd(buf, 1, length - 2 + 4), Is.True);
buf[1 + r.Next(buf.Length - 2)] ^= 0x1;
Assert.That(Crc32Algorithm.IsValidWithCrcAtEnd(buf, 1, length - 2 + 4), Is.False);
}
}
}
}