public static unsafe ResourceNode FromSource(ResourceNode parent, DataSource source)
{
ResourceNode n = null;
if ((n = GetRaw(source)) != null)
{
n.Initialize(parent, source);
}
else
{
//Check for compression?
if (Compressor.IsDataCompressed(source.Address, source.Length))
{
if ((*(uint *)source.Address) == YAZ0.Tag)
{
YAZ0 *cmpr = (YAZ0 *)source.Address;
try
{
//Expand the whole resource and initialize
FileMap map = FileMap.FromTempFile((int)cmpr->_unCompDataLen);
Compressor.Expand(cmpr, map.Address, map.Length);
source.Compression = CompressionType.RunLength;
//Check for a match
if ((n = GetRaw(new DataSource(map.Address, map.Length))) != null)
{
n.Initialize(parent, source, new DataSource(map));
}
}
catch (InvalidCompressionException e) { MessageBox.Show(e.ToString()); }
}
else
{
CompressionHeader *cmpr = (CompressionHeader *)source.Address;
if (Compressor.Supports(cmpr->Algorithm))
{
try
{
//Expand a portion of the data
byte *buffer = stackalloc byte[CompressBufferLen];
Compressor.Expand(cmpr, buffer, CompressBufferLen);
//Check for a match
if ((n = GetRaw(new DataSource(buffer, CompressBufferLen))) != null)
{
//Expand the whole resource and initialize
FileMap map = FileMap.FromTempFile(cmpr->ExpandedSize);
Compressor.Expand(cmpr, map.Address, map.Length);
source.Compression = cmpr->Algorithm;
n.Initialize(parent, source, new DataSource(map));
}
}
catch (InvalidCompressionException e) { MessageBox.Show(e.ToString()); }
}
}
}
}
return(n);
}
public static void ExpandYAZ0(YAZ0 *header, VoidPtr dstAddress, int dstLen)
{
byte control = 0, bit = 0;
byte *srcPtr = (byte *)header->Data, dstPtr = (byte *)dstAddress, ceiling = dstPtr + dstLen;
while (dstPtr < ceiling)
{
if (bit == 0)
{
control = *srcPtr++;
bit = 8;
}
bit--;
if ((control & 0x80) == 0x80)
{
*dstPtr++ = *srcPtr++;
}
else
{
byte b1 = *srcPtr++, b2 = *srcPtr++;
byte *cpyPtr = (byte *)((VoidPtr)dstPtr - ((b1 & 0x0f) << 8 | b2) - 1);
int n = b1 >> 4;
if (n == 0)
{
n = *srcPtr++ + 0x12;
}
else
{
n += 2;
}
//if (!(n >= 3 && n <= 0x111)) return;
while (n-- > 0)
{
*dstPtr++ = *cpyPtr++;
}
}
control <<= 1;
}
}
public static void Expand(YAZ0 *header, VoidPtr dstAddr, int dstLen)
{
RunLength.ExpandYAZ0(header, dstAddr, dstLen);
}
public static void ExpandYAZ0(YAZ0 *header, VoidPtr dstAddress, int dstLen)
{
Expand(header->Data, dstAddress, dstLen);
}