// TODO: Maybe replace this with LCWCompression.DecodeInto again later
public static int LCWDecodeInto(byte[] src, byte[] dest, int srcOffset = 0, bool reverse = false)
{
var ctx = new FastByteReader(src, srcOffset);
var destIndex = 0;
while (true)
{
var i = ctx.ReadByte();
if ((i & 0x80) == 0)
{
// case 2
var secondByte = ctx.ReadByte();
var count = ((i & 0x70) >> 4) + 3;
var rpos = ((i & 0xf) << 8) + secondByte;
if (destIndex + count > dest.Length)
{
return(destIndex);
}
// Replicate previous
var srcIndex = destIndex - rpos;
if (srcIndex > destIndex)
{
throw new NotImplementedException("srcIndex > destIndex {0} {1}".F(srcIndex, destIndex));
}
for (var j = 0; j < count; j++)
{
if (destIndex - srcIndex == 1)
{
dest[destIndex + j] = dest[destIndex - 1];
}
else
{
dest[destIndex + j] = dest[srcIndex + j];
}
}
destIndex += count;
}
else if ((i & 0x40) == 0)
{
// case 1
var count = i & 0x3F;
if (count == 0)
{
return(destIndex);
}
ctx.CopyTo(dest, destIndex, count);
destIndex += count;
}
else
{
var count3 = i & 0x3F;
if (count3 == 0x3E)
{
// case 4
var count = ctx.ReadWord();
var color = ctx.ReadByte();
for (var end = destIndex + count; destIndex < end; destIndex++)
{
dest[destIndex] = color;
}
}
else
{
// If count3 == 0x3F it's case 5, else case 3
var count = count3 == 0x3F ? ctx.ReadWord() : count3 + 3;
var srcIndex = reverse ? destIndex - ctx.ReadWord() : ctx.ReadWord();
if (srcIndex >= destIndex)
{
throw new NotImplementedException("srcIndex >= destIndex {0} {1}".F(srcIndex, destIndex));
}
for (var end = destIndex + count; destIndex < end; destIndex++)
{
dest[destIndex] = dest[srcIndex++];
}
}
}
}
}
public static int DecodeInto(byte[] src, byte[] dest, int srcOffset = 0, bool reverse = false)
{
var ctx = new FastByteReader(src, srcOffset);
var destIndex = 0;
while (true)
{
var i = ctx.ReadByte();
if ((i & 0x80) == 0)
{
// case 2
var secondByte = ctx.ReadByte();
var count = ((i & 0x70) >> 4) + 3;
var rpos = ((i & 0xf) << 8) + secondByte;
if (destIndex + count > dest.Length)
return destIndex;
ReplicatePrevious(dest, destIndex, destIndex - rpos, count);
destIndex += count;
}
else if ((i & 0x40) == 0)
{
// case 1
var count = i & 0x3F;
if (count == 0)
return destIndex;
ctx.CopyTo(dest, destIndex, count);
destIndex += count;
}
else
{
var count3 = i & 0x3F;
if (count3 == 0x3E)
{
// case 4
var count = ctx.ReadWord();
var color = ctx.ReadByte();
for (var end = destIndex + count; destIndex < end; destIndex++)
dest[destIndex] = color;
}
else if (count3 == 0x3F)
{
// case 5
var count = ctx.ReadWord();
var srcIndex = reverse ? destIndex - ctx.ReadWord() : ctx.ReadWord();
if (srcIndex >= destIndex)
throw new NotImplementedException("srcIndex >= destIndex {0} {1}".F(srcIndex, destIndex));
for (var end = destIndex + count; destIndex < end; destIndex++)
dest[destIndex] = dest[srcIndex++];
}
else
{
// case 3
var count = count3 + 3;
var srcIndex = reverse ? destIndex - ctx.ReadWord() : ctx.ReadWord();
if (srcIndex >= destIndex)
throw new NotImplementedException("srcIndex >= destIndex {0} {1}".F(srcIndex, destIndex));
for (var end = destIndex + count; destIndex < end; destIndex++)
dest[destIndex] = dest[srcIndex++];
}
}
}
}
