public void VerifyXor()
{
var left = Enumerable.Range(0, 300).SelectMany(x => BitConverter.GetBytes(x * 27)).ToArray().AsBucket();
var right = Enumerable.Range(0, 300).Reverse().SelectMany(x => BitConverter.GetBytes(x * 31)).ToArray().AsBucket();
var xorResult = new BitwiseXorBucket(left, right).ToArray().SelectPer(4).Select(x => BitConverter.ToInt32(x, 0));
Assert.IsTrue(xorResult.SequenceEqual(Enumerable.Range(0, 300).Select(x => x * 27).Zip(Enumerable.Range(0, 300).Reverse().Select(x => x * 31), (x, y) => x ^ y)));
left = Enumerable.Range(0, 600).SelectMany(x => BitConverter.GetBytes(x * 27)).ToArray().AsBucket();
right = Enumerable.Range(0, 300).Reverse().SelectMany(x => BitConverter.GetBytes(x * 31)).ToArray().AsBucket();
xorResult = new BitwiseXorBucket(left, right).ToArray().SelectPer(4).Select(x => BitConverter.ToInt32(x, 0));
Assert.IsTrue(xorResult.SequenceEqual(Enumerable.Range(0, 600).Select(x => x * 27).Zip(Enumerable.Range(0, 300).Reverse().Select(x => x * 31).Concat(Enumerable.Range(0, 300).Select(x => 0)), (x, y) => x ^ y)));
left = Enumerable.Range(0, 300).SelectMany(x => BitConverter.GetBytes(x * 27)).ToArray().AsBucket();
right = Enumerable.Range(0, 600).Reverse().SelectMany(x => BitConverter.GetBytes(x * 31)).ToArray().AsBucket();
xorResult = new BitwiseXorBucket(left, right).ToArray().SelectPer(4).Select(x => BitConverter.ToInt32(x, 0));
Assert.IsTrue(xorResult.SequenceEqual(Enumerable.Range(0, 300).Select(x => x * 27).Concat(Enumerable.Range(0, 300).Select(x => 0)).Zip(Enumerable.Range(0, 600).Reverse().Select(x => x * 31), (x, y) => x ^ y)));
}
public async Task Read4BitmapsXor()
{
string bmpFile = FindResource("*.bitmap") ?? throw new InvalidOperationException("Bitmap not found");
var fb = FileBucket.OpenRead(bmpFile);
var headers = await fb.ReadFullAsync(32); // Skip headers
uint count = NetBitConverter.ToUInt32(headers, 8);
Assert.AreEqual(106u, count);
List <GitEwahBitmapBucket> buckets = new List <GitEwahBitmapBucket>();
for (int i = 0; i < 4; i++)
{
buckets.Add(new GitEwahBitmapBucket(fb.Duplicate(false)));
await fb.ReadNetworkUInt32Async(); // Bitlength
uint u2 = await fb.ReadNetworkUInt32Async(); // Compressed length
for (uint n = 0; n < u2; n++)
{
await fb.ReadNetworkUInt64Async();
}
await fb.ReadNetworkUInt32Async(); // Last RLW start
}
var allXor = new BitwiseXorBucket(new BitwiseXorBucket(buckets[0], buckets[1]), new BitwiseXorBucket(buckets[2], buckets[3]));
int maxBits = buckets.Max(x => x.ReadBitLengthAsync().AsTask().Result);
Assert.AreEqual(2369, maxBits);
var bb = await allXor.ReadFullAsync((maxBits + 7) / 8);
for (int i = 0; i < bb.Length - 1; i++)
{
Assert.AreEqual((byte)0xFF, bb[i]);
}
}
