/// <summary>
/// Writes the time span either in 1, 3, 5 or 8 bytes. How ever, it is limited to 7000 years of
/// span. If you write a longer distance, than consider just writing ticks, because this method will
/// truncate to the theoretical length of 2^61 ticks.
/// </summary>
/// <param name="span">The long to write.</param>
internal unsafe void WriteCompressed(TimeSpan span)
{
long ticks = span.Ticks;
bool negative = ticks < 0;
if (negative)
{
ticks = -ticks;
}
if (ticks > 2305843009213693951) // A little bit over 7k years.
{
ticks = 2305843009213693951;
}
if (ticks >= 137438953472) // We need 8 Bytes.
{
if (size < 8)
{
writer.flush(this);
next.WriteCompressed(span);
return;
}
fixed(byte *bData = this.data)
{
if (negative)
{
*(bData + position) = (byte)(0xE0 | (ticks >> 56));
}
else
{
*(bData + position) = (byte)(0xC0 | (ticks >> 56));
}
*(uint *)(bData + position + 1) = (uint)(ticks >> 24);
*(ushort *)(bData + position + 5) = (ushort)(ticks >> 8);
*(bData + position + 7) = (byte)ticks;
}
position += 8;
size -= 8;
return;
}
if (ticks >= 2097152) // We need 5 Bytes.
{
if (size < 5)
{
writer.flush(this);
next.WriteCompressed(span);
return;
}
fixed(byte *bData = this.data)
{
if (negative)
{
*(bData + position) = (byte)(0xA0 | (ticks >> 32));
}
else
{
*(bData + position) = (byte)(0x80 | (ticks >> 32));
}
*(uint *)(bData + position + 1) = (uint)ticks;
}
position += 5;
size -= 5;
return;
}
if (ticks >= 32) // We need 3 Bytes.
{
if (size < 3)
{
writer.flush(this);
next.WriteCompressed(span);
return;
}
fixed(byte *bData = this.data)
{
if (negative)
{
*(bData + position) = (byte)(0x60 | (ticks >> 16));
}
else
{
*(bData + position) = (byte)(0x40 | (ticks >> 16));
}
*(ushort *)(bData + position + 1) = (ushort)ticks;
}
position += 3;
size -= 3;
return;
}
if (size < 1)
{
writer.flush(this);
next.WriteCompressed(span);
return;
}
if (negative)
{
ticks |= 0x20;
fixed(byte *bData = this.data)
* (bData + position) = (byte)ticks;
position += 1;
size -= 1;
}
public void WriteCompressed(TimeSpan span)
{
currentSegment.WriteCompressed(span);
}
