size_logrec.c

来自「seed格式数据解压程序,地震分析人员必备」· C语言 代码 · 共 48 行

/*===========================================================================*/
/* DMC interim out |       size_logrec.c                   |  Utility        */
/*===========================================================================*/
/*
	Name:		size_logrec.c
	Purpose:	determine size of blockettes when padded to logical records
	Usage:		
	Input:		
	Output:		number of bytes, number of records
	Externals:	
	Warnings:	
	Errors:		
	Fatals:
	Called by:	
	Calls to:	
	Algorithm:	
	Notes:		
	Problems:	
	References:	
	Language:	
	Revisions:	mm/dd/yy  pgmr name  change
*/

#include "output.h"

int size_logrec( blockette_size, lrecl, padded_size )
int		blockette_size;			/* current blockette size */
int		lrecl;					/* logical record size */
int		*padded_size;			/* total size of padded blockettes */
{

/*
 * blockettes will be copied into this chunk size: the size of the data area
 */
	int	user_data = lrecl-sizeof(struct hdr_logrec);	/* seed header stuff */
/*
 * if the current total size is within ENDPAD of a logical record boundary,
 * then we must round up the "currect padded size" to the next record boundary
 * and in any case, then add the new data size itself.
 */
	if( user_data - (*padded_size % user_data) <= ENDPAD )
	{
		*padded_size = ( (*padded_size+user_data-1) / user_data) * user_data;
	}
	*padded_size += blockette_size;
	return( (*padded_size+user_data-1) / user_data );
}