Name:		CIRCUS
Description:	cui plug-in for extracting Circus archive
Archive:	.CRX .PCK(no magic) .pcm .DAT(no magic)
Author:	        痴漢公賊 (glanser@163.com)
Version:	0.3.2
Status:	        Alpha

【TODO】
1. Support extraction of type 1-3 .pcm files.
2. True tears ～トゥルーティアーズ～'s AdvData\GRP\EVG\e1_07_a.crx caused an extraction error. Waiting for test results.

【.CRX Resource Info】
    meta-data is bmp(24-bit and 32-bit).
    the file is used widely in Circus' game, mainly is used for storing various types of image datas.
    
    	header:
    		s8 magic[4];	// "CRXG"
		u32 zero;    	// all 0
		u16 width;	// width
		u16 height;	// height
		u16 mode;	// 1 - no compression; 2 - zlib compression
		u16 unknown1;	// unknown(if bigger than 1, file is invalid crx)
		u32 color_type;	// 0 - 24-bit; 1 - 32bit; etc(usually be 0) - 8-bit
	data:
		on the basis of mode field. meta-data after decompressing is with encoding transformed bmp, first byte of every line means filtering transformation mode or RLE(0-3 means 4 filtering transformations, 4 means RLE)

【.PCK Archive Info】
    the .PCK is type of CRX archive with directory.
    meta-data is CRX file.
    internal CRX is continuous frame image, is used for producing anime effect.
  
    	header:
		u32 entries;    // resource number
	fast index segment:
		u32 offset;	// resource data offset(count from file header)				
		u32 length;	// resource data length  
	index segment:
		s8 name[56];	// resource name
		u32 offset;	// resource data offset(count from file header)				
		u32 length;	// resource data length  	
	data:
		CRX file.

【.pcm Resource Info】
    meta-data is PCM WAV file.
    the file is used widely in Circus' game, mainly is used for storing various types of audio datas.
    
    	header:   
		s8 magic[4];		// "XPCM"
		u32 length;		// data length(actual meaning base on mode field)
		u8 mode;		// 0 - PCM data; 1 - VQ compression + lz compression; 2 - ADPCM data; 3 - VQ compression + zlib compression
		u8 parameter;		// when mode is 1 and 3, means using scale table.
		u8 reserved[2];			
		u16 wFormatTag; 	// about meaning of following field, please reference related WAVEFORMATEX description on MSDN.
		u16 nChannels;
		u32 nSamplesPerSec;
		u32 nAvgBytesPerSec;
		u16 nBlockAlign;
		u16 wBitsPerSample;  
	data:
		on the basis of mode field. 

【.DAT Archive Info】
    the .DAT is type of pcm archive with directory.
    meta-data is pcm file.
    the file is used widely in Circus' game, mainly is used for storing character voice data(VOICE.DAT).
    
    	header:
    		u32 entries;	// resource number(every item with 64 bytes)
	index segemnt:
		u8 name[60];	// resource name
		u32 offset;	// resource offset(count from file header)	
	data:
		closely behind index segemnt. data content is mainly type 3 XPCM.	

【ChangeLog】
2008-04-24 12:06 ver 0.3.2 resumed extracting .DAT
2008-04-03 12:48 ver 0.3.1 modified extraction mode about type 3 pcm
2007-11-24 21:02 ver 0.3.0 supported extracting type 1 .CRX file; supported extracting type 2 CRX file in 8-bit
2007-06-02 00:30 ver 0.2.1 closed temporarily function for extracing .dat because of .dat itself lacking definite magic to match and difficulty in extracting XPCM data at present 
2007-05-02 11:53 ver 0.2.0 fixed a bug for detecting incorrectlly RLE's copying boundary when extracting crx
2007-02-17 00:46 ver 0.1.0 1st version released, supported without probability of extracting type 1-3 .pcm