public static void Decompress(Span <Byte> compressed, Span <Byte> decompressed)
{
unsafe
{
fixed(Byte *cPtr = &compressed.GetPinnableReference())
fixed(Byte * dPtr = &decompressed.GetPinnableReference())
{
DecompressorContext context = DecompressorContext.PrepareDecompression(cPtr, checked ((UInt32)compressed.Length), checked ((UInt32)decompressed.Length));
context.Decompress(dPtr);
}
}
}
public static DecompressorContext PrepareDecompression(Byte *data, UInt32 compressedSize, UInt32 decompressedSize)
{
UInt32 *data32 = (UInt32 *)data;
UInt32 magic = *data32++;
if (magic != 0x1234)
{
throw new NotSupportedException("if (magic != 0x1234)");
}
UInt32 blkCnt = *data32++;
UInt32 blkSz = *data32++;
UInt32 headerSz = *data32++;
if (headerSz != 16 + 12 * blkCnt)
{
throw new NotSupportedException("if (header_sz != 16 + 12 * blk_cnt)");
}
var info = new DecompressorContext();
info.SetInput(data, compressedSize);
info.SetBlocks(blkCnt, blkSz);
UInt32 outputSize = 0;
for (Int32 i = 0; i < blkCnt; ++i)
{
UInt32 decSz = *data32++;
UInt32 cmpSz = *data32++;
UInt32 offset = *data32++;
outputSize += decSz;
info.SetDataChunk(i, decSz, cmpSz, offset);
}
if (decompressedSize != outputSize)
{
throw new NotSupportedException("if (uncompressedSize != output_size)");
}
info.SetOutput(outputSize);
return(info);
}