// fileCache.c : Implements a file cache for reading and writing

// INCLUDE

#include <stdio.h>
#include <stdlib.h>
#include "fileCache.h"

// GLOBAL VARIABLES

char cacheFile1[] = "C:\\FTPCACH1.TMP";
char cacheFile2[] = "C:\\FTPCACH2.TMP";
FtpFh ftpfh1;
FtpFh ftpfh2;
int LRU = 1;

// FUNCTION DEFINITIONS

LPSTR CheckCache(FtpFh ftpfh)
{
	if ( ftpfh == ftpfh1 )
	{
		LRU = 2;
		printf("Hit FileCache: 1\n");
		return cacheFile1;
	}
	else if ( ftpfh == ftpfh2 )
	{
		LRU = 1;
		printf("Hit FileCache: 2\n");
		return cacheFile2;
	}
	else
	{
		printf("Miss FileCache\n");
		return NULL;
	}
}

LPSTR CacheFile(FtpFh ftpfh)
{
	if ( LRU == 1 )
	{
		LRU    = 2;
		ftpfh1 = ftpfh;
		printf("Caching file: 1\n");
		return cacheFile1;
	}
	else if ( LRU == 2 )
	{
		LRU    = 1;
		ftpfh2 = ftpfh;
		printf("Caching file: 2\n");
		return cacheFile2;
	}
	else
	{
		printf("ERROR.... BAD LRU\n");
		return NULL;		// should never occur
	}
}	

void InvalidateFileCache()
{

	ftpfh1 = NULL;
	ftpfh2 = NULL;
	LRU = 1;
}