fits_asf.cpp

本源码是一个用于卫星数据处理的程序

#include <stdio.h>
#include <vector>
#include "stdafx.h"
#include "ccsds_pro.h"
#include "fits_asf.h"

ZT_t::find_pointer ZT_t::s_ite = NULL;
/*****************************************************
** 函数名： LoadZT
** 输入： hxmtfile, s
**        hxmtfile    --- 文件名结构 
**        s           --- 存放多个容器的结构体
** 输出： 
**           函数执行成功返回0
** 调用说明：	
**			strUTC2time() .......把年月日是时分秒格式的时间字符串转换成对应的秒			
** 功能描述：输入一个姿态文件，把文件中的每行数据的各个字段读入容器中
****************************************************************************************/
int LoadZT( const hxmt_file_t *hxmtfile , struct sci_intern *s )
{
	FILE *fp = NULL;
	char *buffer = NULL;
	if( !hxmtfile || (fp = fopen(hxmtfile->filename.c_str(), "r")) == NULL  )//打开文件
		return -1;

	if( (buffer = (char *)malloc(FREAD_BUFFER_SIZE)) == NULL )	{
		fclose(fp); 
		return -ERROR_NOT_ENOUGH_MEMORY;
	}

	while( fgets(buffer, FREAD_BUFFER_SIZE, fp) )//从文件中逐行读取数据
	{
		ZT_t zt;//定义一个姿态数据结构，用于存放文件中一行数据的各个字段
		float f;
		char *p = NULL;
		if( (p = strchr(buffer, '\t')) == NULL )//从第一行开始找到第一个空格
			continue;
		*p = '\0';
		strUTC2time( buffer, &zt.utc);//第一个空格前的时间字符串赋值给zt.utc

		sscanf( ++p, "%f", &f );//读取第二个空格前的浮点数到f
		zt.trans_lon = f;
		
		if( (p = strchr( p, '\t')) == NULL )	continue;
		sscanf( ++p, "%f", &f );//读取第3个空格前的浮点数给f
		zt.trans_lon_angle = f;

		if( (p = strchr( p, '\t')) == NULL )	continue;
		sscanf( ++p, "%f", &f );//读取第4个空格前的浮点数给f
		zt.trans_lat = f;

		if( (p = strchr( p, '\t')) == NULL )	continue;
		sscanf( ++p, "%f", &f );//读取最后一个浮点数给f
		zt.trans_lat_angle = f;		

		s->zt_table.push_back( zt );
			
	}
	
	std::sort( s->zt_table.begin(), s->zt_table.end() );

	free( buffer );
	fclose( fp );

	return 0;	
}
/*****************************************************
** 函数名： process_zt
** 输入： hxmtfile, 
**        hxmtfile    --- 文件名结构 
** 输出： 
**           函数执行成功返回0
** 调用说明：	
**			get_sci_data() .......
**			get_fits_filename()...	
**			close_fits_zt() ......
**			open_fits_zt() .......
**			write_fits_zt() ......	
** 功能描述: 输入一个姿态文件，处理姿态文件中的数据，并生成相应的fits文件
****************************************************************************************/
int process_zt( const hxmt_file_t *hxmtfile )
{
	int modetype;//模式
	std::string fits_name;
	fitsfile *fptr = NULL;
	std::string pathfilename;
	hxmt_file_t hxmt = *hxmtfile;
	std::string prev_fitsname;
	
	std::vector<ZT_t>::const_iterator end = get_sci_data()->zt_table.end();
	for( std::vector<ZT_t>::const_iterator ite = get_sci_data()->zt_table.begin();
			ite != end; ++ite )//循环处理姿态容器中的每一个数据
	{
		hxmt.start.time = ite->utc.time;
		hxmt.start.usec = ite->utc.usec;
		{
			std::string new_fitsname;
		
			get_fits_filename( &hxmt, new_fitsname, pathfilename, modetype, fits_name );//得到新的存放路径和fits文件名
			if( new_fitsname != prev_fitsname ) {
				prev_fitsname = new_fitsname;
				close_fits_zt( fptr );
				fptr = NULL;
				if( 0 != open_fits_zt( &hxmt, &fptr) ) {
					return -3;
				}
			}
		}

		write_fits_zt( fptr, ite, 1 );//往fits文件中写数据
	}
	
	close_fits_zt( fptr );
	return 0;
}
/*****************************************************
** 函数名： open_fits_zt
** 输入： hxmtfile, 
**        hxmtfile    --- 文件名结构 
** 输出： *fptr
**        *fptr       ---
** 调用说明：	
**			get_fits_filename() .......得到文件名和保存路径以及模式
**			DirExist1()         .......判断路径是否存在
**			CreateFilePath()    .......创建一个新路径
**			time2strUTC_fitshead() ....秒时间转换成对应的年月日时分秒格式的字符串
** 功能描述: 输入一个姿态文件，生成fits文件，并写入fits头中的关键字，通过fptr返回生成fits文件的结构
****************************************************************************************/
int open_fits_zt( const hxmt_file_t *hxmtfile, fitsfile **fptr )
{
	fitsfile *fp;
	int status = 0;
	std::string filename;
	std::string pathname;
	int modetype;
	std::string fits_name;
	if( get_fits_filename(hxmtfile, filename, pathname, modetype, fits_name) )
		return -1;
	{
		extern std::string product_dest_dir;//一级产品保存路径
		std::string path = product_dest_dir + pathname + "\\";
		if( !DirExist1(path.c_str()) )		{
			extern FILE *arch_filep;
			pathname += "\n";
			fwrite(pathname.c_str(), sizeof(char), pathname.length(), arch_filep);//往id文件中写文件名
		}
		
	}
	if( !CreateFilePath(filename.c_str()) )
		return -2;
	if( fits_open_file(&fp, filename.c_str(), READWRITE, &status) )
	{
		status = 0;
		if( fits_create_file(&fp, filename.c_str(), &status) )
			return status;

		if( fits_create_img(fp,  BYTE_IMG, 0, NULL, &status) )
			return status;
//		ffpcom(*fptr, "ALL TIME IN THIS FILE IS UTC", &status); /*增加必要的注释*/
		
		timespec_t t;
		time( &t.time );//系统当前时间
		t.usec = 0;
		char buf[40];
		time2strUTC_fitshead( buf, sizeof(buf), &t );//秒时间转换成对应的年月日时分秒格式的字符串
		/* 在第一个head中写入需要的关键字 */
		if ( fits_update_key(fp, TSTRING , "DATE_CRT", buf, "FITS file creation date", &status) )
			 return status; 
		if ( fits_update_key(fp, TSTRING , "TELESCOP", "HXMT", "Telescope or mission name", &status) )
			 return status;
		if ( fits_update_key(fp, TSTRING , "ORIGIN", "HDPS", "Origin of FITS file", &status) )
			 return status;
		if ( fits_update_key(fp, TSTRING , "HDPSLEVL", "RAW", "HDPS level of data processing", &status) )
			 return status;
		if ( fits_update_key(fp, TSTRING , "CREATOR", "POAC", "program that create this FITS file", &status) )                                                                                                                                   
			 return status;

		status = 0;
		int tfields   = 5;       /* table will have 5 columns */
		long nrows    = 0;
		char extname[] = "ATTITUDE_Binary";           /* extension name */
		char *ttype[] = { "TIME", "TRANS_LON", "TRANS_LON_ANGLE", "TRANS_LAT", "TRANS_LAT_ANGLE" };
		char *tform[] = { "19A", "1D", "1D", "1D", "1D" };
		char *tunit[] = { "\0", "\0", "\0", "\0", "\0" };
		if ( fits_create_tbl( fp, BINARY_TBL, nrows, tfields, ttype, tform,	tunit, extname, &status) ) {
			fits_close_file( fp, &status );//创建第2个head
			return status;
		}
	}
	
	*fptr = fp;
	return 0;
}

/*****************************************************
** 函数名： write_fits_zt
** 输入： fptr, zt，n
**        hxmtfile    --- 文件名结构 
**        zt          --- 姿态数据结构
**		  n           ---
** 输出： 
**        函数执行成功返回0
** 调用说明：	
**			time2strUTC_fitshead() ....秒时间转换成对应的年月日时分秒格式的字符串
** 功能描述: 输入先前生成的fits文件结构和姿态数据，把姿态数据写入fits文件中
****************************************************************************************/
int write_fits_zt( fitsfile *fptr, const ZT_t *zt, int n )
{
	if( fptr == NULL )
		return -1;

	int status = 0;
	unsigned int nrows = 0;
	int hdutype;
    if ( fits_movabs_hdu(fptr, 2, &hdutype, &status) ) //转到第2个head
		 return status;
	if( fits_read_key(fptr, TINT, "NAXIS2", &nrows, NULL, &status) )
		return status;

//	for( int i = 0; i < n; i++, nrows++ )
	{
		if (fits_insert_rows(fptr, nrows, 1, &status))
			  return status;
    
		int firstrow = nrows + 1;
		int firstelem = 1;
		void *var[1];	
		status = 0;		
		char strUTC[40];
		time2strUTC_fitshead( strUTC, sizeof(strUTC), &zt->utc );
		var[0] = (void *)strUTC;
		/********************逐列写入数据*****************************/
		fits_write_col(fptr, TSTRING, 1, firstrow, firstelem, n, var, &status);
		fits_write_col(fptr, TDOUBLE, 2, firstrow, firstelem, n, (void *)&zt->trans_lon, &status);
		fits_write_col(fptr, TDOUBLE, 3, firstrow, firstelem, n, (void *)&zt->trans_lon_angle, &status);
		fits_write_col(fptr, TDOUBLE, 4, firstrow, firstelem, n, (void *)&zt->trans_lat, &status);
		fits_write_col(fptr, TDOUBLE, 5, firstrow, firstelem, n, (void *)&zt->trans_lat_angle, &status);
	}
	return 0;
}

int close_fits_zt( fitsfile *fptr )//此函数关闭fits文件
{
	int status = 0;
	if( fits_close_file( fptr, &status) )
		return status;
	return 0;
}