/**
*	@file		SegdReader.h
*	@brief		SegD格式文件读取类
*	@author		
*	@date		2011-11-15
*/

#pragma once
#include "SegDHeader.h"
#include "SeisLineData.h"

namespace NSegD
{

typedef struct stuSegDFileHeader
{
	unsigned short	ver;				//版本号：1=版本1.0，2=版本2.0，3=版本3.0(目前不支持3.0版)

	int				fileNumber;			//文件号

	unsigned short	formatCode;			//格式代码
	//时序
		//0x0015  20 bit binary multiplexed 
		//0x0022  8 bit quaternary multiplexed 
		//0x0024  16 bit quaternary multiplexed 
		//0x0036  24 bit 2's compliment integer multiplexed 
		//0x0038  32 bit 2's compliment integer multiplexed 
		//0x0042  8 bit hexadecimal multiplexed 
		//0x0044  16 bit hexadecimal multiplexed 
		//0x0048  32 bit hexadecimal multiplexed 
		//0x0058  32 bit IEEE multiplexed 
	//道序
		//0x8015  20 bit binary demultiplexed 
		//0x8022  8 bit quaternary demultiplexed 
		//0x8024  16 bit quaternary demultiplexed 
		//0x8036  24 bit 2's compliment integer demultiplexed 
		//0x8038  32 bit 2's compliment integer demultiplexed 
		//0x8042  8 bit hexadecimal demultiplexed 
		//0x8044  16 bit hexadecimal demultiplexed 
		//0x8048  32 bit hexadecimal demultiplexed 
		//0x8058  32 bit IEEE demultiplexed 
	//无效
		//0200  Illegal, do not use 
		//0000  Illegal, do not use

	unsigned short	scanInterval;			//采样间隔
	int				recordLength;			//记录长度

	//通常一次记录过程中的记录道数和采集参数是不变化的，所以通常仅有1个扫描类型
	unsigned short	scanTypesNum;			//扫描类型个数
	unsigned short	channelNumPerScanType;	//一个扫描类型内包含的道组数
	int				totalChannelsNumber;    /* total number of channels */

	unsigned short	sampleSkewNum;			//采样时偏头段个数

	unsigned short	trailerNum;				/* 13-14 General trailer number */

	unsigned short	generalHeaderNum;		/* 12  Number blocks in general header 头段块的个数（高四位）通用头段块个数，至少2个*/
	unsigned short	extendedHeaderNum;		//扩展头段个数
	int				externalHeaderNum;		//外部头个数

	//头块长度
	//( generalHeaderNum + scanTypesNum*(channelNumPerScanType+sampleSkewNum) + extendedHeaderNum + externalHeaderNum + 1 ) * 32

	unsigned short	year;		//Year (0-99)
	unsigned short	day;		//Day  (1-366)
	unsigned short	hour;		/* 14    Hour of day(0-23) */
	unsigned short	minute;     /* 15    Minute of hour(0-59) */
	unsigned short	second;     /* 16    Second of minute(0-59) */
	
	//仅对时序保存方式有效////////////////////////////////////////////////
	//每块的扫描个数为sb + 2^sbx
	unsigned short sb;		/* 25    Number of scans per block */
	unsigned short sbx;		/* 24    sb的指数，范围0-15 */
	int	scanBytes;			//每个扫描字节数，仅时序
} SEGD_FILE_HEADER;

typedef struct stuSegDTraceHeader
{
	int				fileNumber;			//文件号
	unsigned short	scanType;			//扫描类型
	unsigned short	channelSetNum;		//道集数
	unsigned short	traceNumber;		/* 05-06 trace number		道号		*/
	unsigned short	extendHeaderNum;	/* 10    trace header extensions 扩展道头的个数 */

    unsigned short	sampleSkew;			/* 11    sample skew of the first sample of the trace. 
										 It is a part of the fractional part of the base scan interval. 
										 Res :1/256 scan interval */

	int				samplesNumber;		/* 每道采样点个数*/

} SEGD_TRACE_HEADER;

class AFX_EXT_CLASS CSegdReader
{
public:
	CSegdReader(void);
	~CSegdReader(void);

	bool	Read(LPCTSTR lpszFileName);
	//包括充填CSegdFileHeader对象
	bool	ReadFileHeader(CFileSegy& fr);		//读取文件头信息

	bool	ReadOneRecordBlock(CFileSegy& fr);	//读取一个记录块
	bool	ReadTapeLabel(CFileSegy& fr);		//读取版本2的磁带头信息，并设置版本号
	bool	ReadTraceHeader(CFileSegy& fr);		//读取道头
	bool	ReadDataTrace(CFileSegy& fr, CSeisTraceData& td);		//读取道数据

	SEGD_FILE_HEADER&  GetFileHeader()	{ return m_fileHeader; }
	SEGD_TRACE_HEADER& GetTraceHeader()	{ return m_traceHeader; }
	bool	IsGain() { return m_bGain; }

protected:
	bool	InitializeTraceHeader(SEGD_DEMUX_TRACE_HEADER& traceHeader);
	bool	InitializeFileHeader(SEGD_GENERAL_HEADER_1& header1, SEGD_GENERAL_HEADER_2& header2);
	bool	InitializeFileHeader(SEGD_GENERAL_HEADER_1& header1);

	CSeisLineData			m_tracesData;		//所有道数据
	SEGD_FILE_HEADER	m_fileHeader;
	SEGD_TRACE_HEADER	m_traceHeader;
	bool				m_bGain;			/* flag for applying gain 是否使用增益*/

	void ClearChannelHeader(void);
	SEGD_CHANNEL_SET_HEADER* GetChannelSetHeader(int i, int j);
	float* GetGain(int i, int j);

	int GetBytesLength(int nSampleNum, int code);

private:
	//文件头
	SEGD_TAPE_LABEL				m_stuTapeLabel;		//版本2 格式的磁带标签定义
	SEGD_GENERAL_HEADER_1		m_stuGHeader1;		//头段块1
	SEGD_GENERAL_HEADER_2		m_stuGHeader2;		//头段块2
	SEGD_GEN_HEAD_SN358			m_stuGHeaderSN358;	
	SEGD_GENERAL_HEADER_N		m_stuGHeaderN;		//扩展头段
	SEGD_SAMPLE_SKEW			m_stuSampleSkew;	//采样时偏
	SEGD_EXTENDED_HEADER		m_stuExtendedHeader;//扩展头段
	SEGD_EXTERNAL_HEADER		m_stuExternalHeader;//外部头段

	SEGD_CHANNEL_SET_HEADER*	m_pChannelHeader;	//扫描类型头段,array[scanTypesNum][channelNumPerScanType]
	float*						m_pGain;			//增益,array[scanTypesNum][channelNumPerScanType] for escaling exponent

	//道头
	SEGD_DEMUX_TRACE_HEADER	m_stuTraceHeader;		//道头
	SEGD_TRACE_HEADER_EXT	m_stuTraceHeaderExt;	//道头扩展

	/* repair byte swap of MP gain */
	int imp0; 
	int imp1;
	int icvt2s;			/* Sercel glitch flag */

protected:
	bool Read(CFileSegy& fr, SEGD_GENERAL_HEADER_1& header1);

	void F8015_to_float (char *from, float* to, int len, int cvt2s);
	void F8022_to_float (char *from, float* to, int len, int cvt2s);
	void F8024_to_float (char *from, float* to, int len, int cvt2s);
	void F8036_to_float (unsigned char *from, float* to, int len);
	void F8038_to_float (char *from, float* to, int len);
	void F8042_to_float (char *from, float* to, int len);
	void F8044_to_float (char *from, float* to, int len);
	void F8048_to_float (char *from, float* to, int len);
	void F8058_to_float (char *from, float* to, int len);
	
	int   BCD(unsigned char * ptr , int begin , int n);
	short GET_S(char* from);
	char  GET_C(char *f);
	unsigned int GET_UC(unsigned char *f)	{ return f[0]; }
	unsigned short GET_US(unsigned char *f);
};

}//namespace