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* National Laboratory for Applied Network Research
* National Center for Supercomputing Applications
* University of Illinois at Urbana - Champaign
* http : //www.ncsa.uiuc.edu
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*
* Extractor . h
* by Ajay Tirumala ( tirumala @ ncsa . uiuc . edu )
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
* Extract data from a file , used to measure the transfer rates
* for various stream formats .
*
* E . g . Use a gzipped file to measure the transfer rates for
* compressed data
* Use an MPEG file to measure the transfer rates of
* Multimedia data formats
* Use a plain BMP file to measure the transfer rates of
* Uncompressed data
*
* This is beneficial especially in measuring bandwidth across WAN
* links where data compression takes place before data transmission
* ------------------------------------------------------------------- */
#ifndef _EXTRACTOR_H
#define _EXTRACTOR_H
#include <stdlib.h>
#include <stdio.h>
#include "Settings.hpp"
#ifdef __cplusplus
extern "C" {
#endif
/**
* Constructor
* @ arg fileName Name of the file
* @ arg size Block size for reading
*/
void Extractor_Initialize( char *fileName, int size, thread_Settings *mSettings );
/**
* Constructor
* @ arg fp File Pointer
* @ arg size Block size for reading
*/
void Extractor_InitializeFile( FILE *fp, int size, thread_Settings *mSettings );
/*
* Fetches the next data block from
* the file
* @ arg block Pointer to the data read
* @ return Number of bytes read
*/
int Extractor_getNextDataBlock( char *block, thread_Settings *mSettings );
/**
* Function which determines whether
* the file stream is still readable
* @ return true , if readable ; false , if not
*/
int Extractor_canRead( thread_Settings *mSettings );
/**
* This is used to reduce the read size
* Used in UDP transfer to accomodate the
* the header ( timestamp )
* @ arg delta Size to reduce
*/
void Extractor_reduceReadSize( int delta, thread_Settings *mSettings );
/**
* Destructor
*/
void Extractor_Destroy( thread_Settings *mSettings );
#ifdef __cplusplus
} /* end extern "C" */
#endif
#endif
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