im having this error message $***$ System Error: Block number $8120$ is invalid

$***$ System Error: Block number $1877$ is invalid

We have read $0$ characters from file DecOfInd.txt

We have read $0$ characters from file CommonSense.txt it should be ou are provided the file DATA as the file you are accessing and that contains the files IHaveADream.txt$,$ CommonSense.txt$,$ DecOfInd.txt$.$ Think of that file as the "hard drive".

The output will vary each run but at the end you should see:

We have read $8120$ characters from file DecOfInd.txt

We have read $1877$ characters from file CommonSense.txt #include

#include

#include

#include

#include

#include $"$b$\_$io$.$h$"$

#include "fsLowSmall.h$"$

#define MAXFCBS $20//$ The maximum number of files open at one time

#define B$\_$CHUNK$\_$SIZE $512$

typedef struct b$\_$fcb $\{$

fileInfo $*$fi;

char $*$buffer; $//$ Added buffer to hold data

int buffer$\_$position; $//$ Added to keep track of position in buffer

$\}$ b$\_$fcb;

b$\_$fcb fcbArray$[$MAXFCBS$]$;

int startup $=0$;

void b$\_$init$()\{$

if $($startup$)$ return;

for $($int i $=0$; i $<$ MAXFCBS; i$++)\{$

fcbArray$[$i$].$fi $=$ NULL;

fcbArray$[$i$].$buffer $=$ NULL; $//$ Initialize buffer pointers

fcbArray$[$i$].$buffer$\_$position $=0$; $//$ Initialize buffer positions

$\}$

startup $=1$;

$\}$

b$\_$io$\_$fd b$\_$getFCB$()\{$

for $($int i $=0$; i $<$ MAXFCBS; i$++)\{$

if $($fcbArray$[$i$].$fi $==$ NULL$)\{$

fcbArray$[$i$].$fi $=($fileInfo $*)-2$;

return i;

$\}$

$\}$

return $-1$; $//$ If no free FCB found

$\}$

b$\_$io$\_$fd b$\_$open$($char $*$filename$,$ int flags$)\{$

if $($startup $==0)$ b$\_$init$()$;

b$\_$io$\_$fd fd $=$ b$\_$getFCB$()$;

if $($fd $==-1)$ return $-1$; $//$ No available FCB

$//$ Get file info

fileInfo $*$file$\_$info $=$ GetFileInfo$($filename$)$;

if $($file$\_$info $==$ NULL$)$ return $-1$; $//$ File not found

$//$ Allocate buffer

fcbArray$[$fd$].$buffer $=($char $*)$malloc$($B$\_$CHUNK$\_$SIZE $*$ sizeof$($char$))$;

if $($fcbArray$[$fd$].$buffer $==$ NULL$)\{$

free$($file$\_$info$)$;

return $-1$; $//$ Memory allocation failed

$\}$

fcbArray$[$fd$].$fi $=$ file$\_$info;

fcbArray$[$fd$].$buffer$\_$position $=0$; $//$ Initialize buffer position

return fd;

$\}$

int b$\_$read$($b$\_$io$\_$fd fd$,$ char $*$buffer$,$ int count$)\{$

if $($startup $==0)$

b$\_$init$()$;

if $(($fd $<0)||($fd $>=$ MAXFCBS$))\{$

return $-1$;

$\}$

if $($fcbArray$[$fd$].$fi $==$ NULL$)\{$

return $-1$;

$\}$

int bytes$\_$read $=0$;

int bytes$\_$to$\_$read $=0$; $//$ Define bytes$\_$to$\_$read variable outside the loop

while $($count $>0)\{$

if $($fcbArray$[$fd$].$buffer$\_$position $==0)\{$

bytes$\_$to$\_$read $=$ B$\_$CHUNK$\_$SIZE $<$ count $?$ B$\_$CHUNK$\_$SIZE : count;

$//$ Call LBAread with appropriate parameters

int bytes$\_$read$\_$from$\_$disk $=$ LBAread$($

fcbArray$[$fd$].$buffer, bytes$\_$to$\_$read,

fcbArray$[$fd$]$

$.$fi$->$fileSize$)$; $//$ Assuming fileSize contains the file size

if $($bytes$\_$read$\_$from$\_$disk $<=0)$

break;

fcbArray$[$fd$].$buffer$\_$position $=$ bytes$\_$read$\_$from$\_$disk;

$\}$

int bytes$\_$to$\_$copy $=$ fcbArray$[$fd$].$buffer$\_$position $<$ count

$?$ fcbArray$[$fd$].$buffer$\_$position

: count;

memcpy$($buffer $+$ bytes$\_$read, fcbArray$[$fd$].$buffer, bytes$\_$to$\_$copy$)$;

bytes$\_$read $+=$ bytes$\_$to$\_$copy;

count $-=$ bytes$\_$to$\_$copy;

fcbArray$[$fd$].$buffer$\_$position $-=$ bytes$\_$to$\_$copy;

fcbArray$[$fd$].$buffer $+=$ bytes$\_$to$\_$copy;

$\}$

return bytes$\_$read;

$\}$

int b$\_$close$($b$\_$io$\_$fd fd$)\{$

if $($fd $<0||$ fd $>=$ MAXFCBS $||$ fcbArray$[$fd$].$fi $==$ NULL$)$ return $-1$;

$//$ Free buffer memory

free$($fcbArray$[$fd$].$buffer$)$;

fcbArray$[$fd$].$buffer $=$ NULL;

fcbArray$[$fd$].$fi $=$ NULL;

fcbArray$[$fd$].$buffer$\_$position $=0$;

return $0$;

$\}$