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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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