public static void DecodeMinDelta32(ref byte *src, int skip, byte *dst)
{
var len = *(int *)src;
var end = src + len;
src += sizeof(int);
var next = sizeof(int) + skip;
*(int *)dst = Codec.DecodeInt32(ref src);
var maxNegDelta = Codec.DecodeInt32(ref src);
var minPosDelta = Codec.DecodeInt32(ref src);
dst += next;
while (src < end)
{
var delta = Codec.DecodeInt32(ref src, out var isNegative);
if (isNegative)
{
*(int *)dst = *(int *)(dst - next) - (delta + maxNegDelta);
}
else
{
*(int *)dst = *(int *)(dst - next) + delta + minPosDelta;
}
dst += next;
}
}
public void TestEncodeDecodeInt32()
{
var values = new int[32 * 4];
for (var i = 1; i < 32; i++)
{
var value = (uint)Math.Pow(2, i);
values[i * 4] = (int)value - 1;
values[i * 4 + 1] = (int)value;
values[i * 4 + 2] = -values[i * 4];
values[i * 4 + 3] = -values[i * 4 + 1];
}
var buffer = stackalloc byte[5];
for (var i = 0; i < values.Length; i++)
{
var p = buffer;
Codec.EncodeInt32(values[i], ref p);
p = buffer;
var value = Codec.DecodeInt32(ref p);
Assert.AreEqual(values[i], value, "At idx: " + i);
}
}
public int DecodeHead(ref byte *src, int len)
{
var start = src;
_minTicks = Codec.DecodeInt64(ref src);
_maxNegValue = Codec.DecodeInt32(ref src);
_minPosValue = Codec.DecodeInt32(ref src);
return((int)(src - start));
}
