public override object Unmarshal(LittleEndianByteBuffer buffer, ref int offset)
{
var result = new LZNT1_CompressedChunk();
result.Chunk_header = Unmarshal <LZNT1_ChunkHeader>(buffer, ref offset);
int value = result.Chunk_header.Value;
bool compressed = (value & 0x8000) != 0;
if (!compressed)
{
throw new XcaException("Unreachable code!");
}
int signature = (value & 0x7000) >> 12;
if (signature != 3)
{
throw new XcaException("[Data error]: Wrong signature!");
}
int size = (value & 0x0FFF) + 1;
var subBuffer = buffer.SubCopy(offset, size);
int subOffset = 0;
result.Flag_group = Unmarshal <LZNT1_FlagGroup>(subBuffer, ref subOffset);
if (subOffset != size)
{
throw new XcaException("[Data error]: Data length is inconsistent!");
}
offset += size;
return(result);
}
public static LZNT1_Chunk Compress(byte[] arg, List <LZNT1_Data> data)
{
int compressedLength = CalculateCompressedLength(data);
if (compressedLength < arg.Length)
{
var compressedChunk = new LZNT1_CompressedChunk();
compressedChunk.Chunk_header = new LZNT1_ChunkHeader();
compressedChunk.Chunk_header.Value = 0xB000;
compressedChunk.Chunk_header.Value |= compressedLength - 3;
compressedChunk.Flag_group = new LZNT1_FlagGroup();
var flagData = new List <LZNT1_FlagData>();
int i = 0;
while (i < data.Count)
{
int groupLength = Math.Min(8, data.Count - i);
var group = data.Skip(i).Take(groupLength);
var flagDataItem = new LZNT1_FlagData(group.ToArray());
flagData.Add(flagDataItem);
i += groupLength;
}
compressedChunk.Flag_group.Flag_data = flagData.ToArray();
return(compressedChunk);
}
else
{
var uncompressedChunk = new LZNT1_UncompressedChunk();
uncompressedChunk.Chunk_header = new LZNT1_ChunkHeader();
uncompressedChunk.Chunk_header.Value = 0x3000;
uncompressedChunk.Chunk_header.Value |= arg.Length - 1;
uncompressedChunk.Uncompressed_data = arg.ToArray();
return(uncompressedChunk);
}
}
