public static byte[] LZ77_Compress(byte[] data, bool header = false) { ByteArrayOutputStream res = new ByteArrayOutputStream(); if (header) { res.writeUInt(0x37375A4C); //LZ77 } res.writeInt((data.Length << 8) | 0x10); byte[] tempBuffer = new byte[16]; //Current byte to compress. int current = 0; while (current < data.Length) { int tempBufferCursor = 0; byte blockFlags = 0; for (int i = 0; i < 8; i++) { //Not sure if this is needed. The DS probably ignores this data. if (current >= data.Length) { tempBuffer[tempBufferCursor++] = 0; continue; } int searchPos = 0; int searchLen = 0; LZ77_Compress_Search(data, current, out searchPos, out searchLen); int searchDisp = current - searchPos - 1; if (searchLen > 2) //We found a big match, let's write a compressed block. { blockFlags |= (byte)(1 << (7 - i)); tempBuffer[tempBufferCursor++] = (byte)((((searchLen - 3) & 0xF) << 4) + ((searchDisp >> 8) & 0xF)); tempBuffer[tempBufferCursor++] = (byte)(searchDisp & 0xFF); current += searchLen; } else { tempBuffer[tempBufferCursor++] = data[current++]; } } res.writeByte(blockFlags); for (int i = 0; i < tempBufferCursor; i++) { res.writeByte(tempBuffer[i]); } } return(res.getArray()); }
public void write(ByteArrayOutputStream outp, ByteArrayOutputStream cam, int camID) { outp.writeUShort((ushort)X); outp.writeUShort((ushort)Y); outp.writeUShort((ushort)Width); outp.writeUShort((ushort)Height); outp.writeByte((byte)Number); outp.writeByte((byte)camID); outp.writeByte((byte)Music); outp.writeByte((byte)Unknown1); outp.writeByte((byte)Unknown2); outp.writeByte((byte)Unknown3); outp.writeByte((byte)Lighting); outp.writeByte((byte)FlagpoleID); cam.writeInt(CameraTop); cam.writeInt(CameraBottom); cam.writeInt(CameraTopSpin); cam.writeInt(CameraBottomSpin); cam.writeUShort((ushort)camID); cam.writeUShort((ushort)CameraBottomStick); cam.writeUInt(0); //This seems just padding. }