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/*---------------------------------------------------------------
* Copyright (c) 1999,2000,2001,2002,2003
* The Board of Trustees of the University of Illinois
* All Rights Reserved.
*---------------------------------------------------------------
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software (Iperf) and associated
* documentation files (the "Software"), to deal in the Software
* without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and
* the following disclaimers.
*
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimers in the documentation and/or other materials
* provided with the distribution.
*
*
* Neither the names of the University of Illinois, NCSA,
* nor the names of its contributors may be used to endorse
* or promote products derived from this Software without
* specific prior written permission.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
* ________________________________________________________________
* National Laboratory for Applied Network Research
* National Center for Supercomputing Applications
* University of Illinois at Urbana-Champaign
* http://www.ncsa.uiuc.edu
* ________________________________________________________________
* Extractor.cpp
* 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
* -------------------------------------------------------------------
*/
#include "Extractor.h"
/**
* Constructor
* @arg fileName Name of the file
* @arg size Block size for reading
* Open the file and set the block size
*/
void Extractor_Initialize ( char *fileName, int inSize, struct thread_Settings *mSettings ) {
if ( (mSettings->Extractor_file = fopen (fileName, "rb")) == NULL ) {
fprintf( stderr, "Unable to open the file stream\n");
fprintf( stderr, "Will use the default data stream\n");
return;
}
mSettings->Extractor_size = inSize;
}
/**
* Constructor
* @arg fp File Pointer
* @arg size Block size for reading
* Set the block size,file pointer
*/
void Extractor_InitializeFile ( FILE *fp, int inSize, struct thread_Settings *mSettings ) {
mSettings->Extractor_file = fp;
mSettings->Extractor_size = inSize;
}
/**
* Destructor - Close the file
*/
void Extractor_Destroy ( struct thread_Settings *mSettings ) {
if ( mSettings->Extractor_file != NULL )
fclose( mSettings->Extractor_file );
}
/*
* Fetches the next data block from
* the file
* @arg block Pointer to the data read
* @return Number of bytes read
*/
int Extractor_getNextDataBlock ( char *data, struct thread_Settings *mSettings ) {
if ( Extractor_canRead( mSettings ) ) {
return(fread( data, 1, mSettings->Extractor_size,
mSettings->Extractor_file ));
}
return 0;
}
/**
* Function which determines whether
* the file stream is still readable
* @return boolean true, if readable; false, if not
*/
int Extractor_canRead ( struct thread_Settings *mSettings ) {
return(( mSettings->Extractor_file != NULL )
&& !(feof( mSettings->Extractor_file )));
}
/**
* 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, struct thread_Settings *mSettings ) {
mSettings->Extractor_size -= delta;
}
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