public void CompressFiles()
{
var files = Directory.EnumerateFiles(@"..\..\..\Data");
foreach (var f in files)
{
var source = File.ReadAllBytes(f);
var compressedData = Snappy.Compress(source);
var decompressedData = Snappy.Decompress(compressedData, 0, compressedData.Length);
Assert.True(decompressedData.SequenceEqual(source));
}
}
public void CompressRandomData()
{
var r = new Random();
var rng = new RNGCryptoServiceProvider();
for (int i = 0; i < 10000; i++)
{
var data = new byte[r.Next(UInt16.MaxValue)];
rng.GetNonZeroBytes(data);
var compressedData = Snappy.Compress(data);
var decompressedData = Snappy.Decompress(compressedData, 0, compressedData.Length);
Assert.True(decompressedData.SequenceEqual(data));
}
}
public void BadData_InsufficentOutputBuffer_ThrowsArgumentException()
{
var input = new byte[100000];
Array.Fill(input, (byte)'A');
var compressed = new byte[Snappy.GetMaxCompressedLength(input.Length)];
var compressedLength = Snappy.Compress(input, compressed);
Assert.Throws <ArgumentException>(() =>
{
var output = new byte[100];
Snappy.Decompress(compressed.AsSpan(0, compressedLength), output);
});
}
public void BadData_FromFile_ThrowsInvalidDataException(string filename)
{
using var resource =
typeof(SnappyTests).Assembly.GetManifestResourceStream($"Snappier.Tests.TestData.{filename}");
Assert.NotNull(resource);
var input = new byte[resource.Length];
resource.Read(input);
Assert.Throws <InvalidDataException>(() =>
{
var length = Snappy.GetUncompressedLength(input);
Assert.InRange(length, 0, 1 << 20);
var output = new byte[length];
Snappy.Decompress(input, output);
});
}
public void BadData_LongLength_ThrowsInvalidDataException()
{
var input = new byte[1000];
Array.Fill(input, (byte)'A');
var compressed = new byte[Snappy.GetMaxCompressedLength(input.Length)];
var compressedLength = Snappy.Compress(input, compressed);
var compressedSpan = compressed.AsSpan(0, compressedLength);
// Set the length header to 16383
compressedSpan[0] = 255;
compressedSpan[1] = 127;
Assert.Throws <InvalidDataException>(() =>
{
var output = new byte[1000];
Snappy.Decompress(compressed, output);
});
}
public void BadData_SimpleCorruption_ThrowsInvalidDataException()
{
var input = Encoding.UTF8.GetBytes("making sure we don't crash with corrupted input");
var compressed = new byte[Snappy.GetMaxCompressedLength(input.Length)];
var compressedLength = Snappy.Compress(input, compressed);
var compressedSpan = compressed.AsSpan(0, compressedLength);
// corrupt the data a bit
compressedSpan[1]--;
compressedSpan[3]++;
Assert.Throws <InvalidDataException>(() =>
{
var length = Snappy.GetUncompressedLength(compressed.AsSpan(0, compressedLength));
Assert.InRange(length, 0, 1 << 20);
var output = new byte[length];
Snappy.Decompress(compressed.AsSpan(0, compressedLength), output);
});
}
public void CompressAndDecompressFile(string filename)
{
using var resource =
typeof(SnappyTests).Assembly.GetManifestResourceStream($"Snappier.Tests.TestData.{filename}");
Assert.NotNull(resource);
var input = new byte[resource.Length];
resource.Read(input);
var compressed = new byte[Snappy.GetMaxCompressedLength(input.Length)];
var compressedLength = Snappy.Compress(input, compressed);
var compressedSpan = compressed.AsSpan(0, compressedLength);
var output = new byte[Snappy.GetUncompressedLength(compressedSpan)];
var outputLength = Snappy.Decompress(compressedSpan, output);
Assert.Equal(input.Length, outputLength);
Assert.Equal(input, output);
}
