public static byte[] Compress(byte[] source, OodleLZ_Compressor compressor, OodleLZ_CompressionLevel level)
{
IntPtr pOptions = OodleLZ_CompressOptions_GetDefault(compressor, level);
OodleLZ_CompressOptions options = Marshal.PtrToStructure <OodleLZ_CompressOptions>(pOptions);
// Required for the game to not crash
options.seekChunkReset = true;
// This is already the default but I am including it for authenticity to game code
options.seekChunkLen = 0x40000;
pOptions = Marshal.AllocHGlobal(Marshal.SizeOf <OodleLZ_CompressOptions>());
try
{
Marshal.StructureToPtr(options, pOptions, false);
long compressedBufferSizeNeeded = OodleLZ_GetCompressedBufferSizeNeeded(source.LongLength);
byte[] compBuf = new byte[compressedBufferSizeNeeded];
long compLen = OodleLZ_Compress(compressor, source, source.LongLength, compBuf, level, pOptions, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, 0);
Array.Resize(ref compBuf, (int)compLen);
return(compBuf);
}
finally
{
Marshal.FreeHGlobal(pOptions);
}
}
private static extern long OodleLZ_Compress(
OodleLZ_Compressor compressor,
[MarshalAs(UnmanagedType.LPArray)]
byte[] rawBuf,
long rawLen,
[MarshalAs(UnmanagedType.LPArray)]
byte[] compBuf,
OodleLZ_CompressionLevel level,
IntPtr pOptions,
IntPtr dictionaryBase,
IntPtr lrm,
IntPtr scratchMem,
long scratchSize);
private static extern IntPtr OodleLZ_CompressOptions_GetDefault(
OodleLZ_Compressor compressor,
OodleLZ_CompressionLevel lzLevel);
private static long OodleLZ_Compress(OodleLZ_Compressor compressor, byte[] rawBuf, long rawLen, byte[] compBuf, OodleLZ_CompressionLevel level)
=> OodleLZ_Compress(compressor, rawBuf, rawLen, compBuf, level,
IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, 0);
