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Project.001: C Programming, Data Structures

Multiple Data Compression and Encryption using Iterative Technique, 120

taruna.chaudhary19 December 2018

RCS file: unique.c,v
Working file: unique.c
head: 1.1
branch:
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root: 1.1
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keyword substitution: kv
total revisions: 1; selected revisions: 1
description:
This function is called by createMasterarray() to return values 0 or 1
If unique character it return 1 else it return 0 to ma
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revision 1.1 locked by: root;
date: 2018/12/21 09:43:22; author: root; state: Exp;
Initial revision

manny170593 December 2018

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RCS file: codelength.c,v
Working file: codelength.c
head: 1.1
branch:
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	root: 1.1
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symbolic names:
keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
This func takes the ma as argument.
Then we calculate the length of ma by using strlen.
Depending on length of ma,this func will return value to compress func.
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revision 1.1	locked by: root;
date: 2018/12/21 17:40:48;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: compress2.c,v
Working file: compress2.c
head: 1.1
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	root: 1.1
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total revisions: 1;	selected revisions: 1
description:
----------------------------
revision 1.1	locked by: root;
date: 2018/12/21 17:43:17;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: compress3.c,v
Working file: compress3.c
head: 1.1
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	root: 1.1
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symbolic names:
keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
----------------------------
revision 1.1	locked by: root;
date: 2018/12/21 17:43:32;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: compress4.c,v
Working file: compress4.c
head: 1.1
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locks: strict
	root: 1.1
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keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
----------------------------
revision 1.1	locked by: root;
date: 2018/12/21 17:43:48;  author: root;  state: Exp;
Initial revision
=============================================================================

manny170593 December 2018

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p { margin-bottom: 0.1in; line-height: 120% }

RCS file: compress5.c,v
Working file: compress5.c
head: 1.1
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	root: 1.1
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keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
----------------------------
revision 1.1	locked by: root;
date: 2018/12/21 17:43:50;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: compress6.c,v
Working file: compress6.c
head: 1.1
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	root: 1.1
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keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
----------------------------
revision 1.1	locked by: root;
date: 2018/12/21 17:43:53;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: compress7.c,v
Working file: compress7.c
head: 1.1
branch:
locks: strict
	root: 1.1
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symbolic names:
keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
----------------------------
revision 1.1	locked by: root;
date: 2018/12/21 17:43:54;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: compression.c,v
Working file: compression.c
head: 1.2
branch:
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	root: 1.2
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total revisions: 2;	selected revisions: 2
description:
Here we declare a pointer to enter the name of file to be opened
then we call the openfile function
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revision 1.2	locked by: root;
date: 2018/12/21 17:43:56;  author: root;  state: Exp;  lines: +24 -5
Here we call the codelength func.
Then depending on the codelength of ma,we will call the compressn() func by using switch which takes the codelength as argument.
----------------------------
revision 1.1
date: 2018/12/20 09:13:52;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: createmasterarray.c,v
Working file: createmasterarray.c
head: 1.2
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total revisions: 2;	selected revisions: 2
description:
Here we will create a masterarray of unique characters in the opened file
first we will declare a char pointer to store all unique characters
we will read the opened file character by character with the help of file descriptor
then we will call unique function to check whether the character read is unique or not
if character is unique,then it is stored in master array
otherwise next character is read
we will store all unique characters in master array
this will return the char pointer
----------------------------
revision 1.2	locked by: root;
date: 2018/12/21 17:46:40;  author: root;  state: Exp;  lines: +17 -12
we replaced the malloc with realloc.
we called the unique func by using its func ptr.
----------------------------
revision 1.1
date: 2018/12/20 09:16:27;  author: root;  state: Exp;
Initial revision
==========

manny170593 December 2018

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RCS file: init.c,v
Working file: init.c
head: 1.1
branch:
locks: strict
	root: 1.1
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symbolic names:
keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
This func is used for mapping func ptr with the respective func.
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revision 1.1	locked by: root;
date: 2018/12/21 17:48:18;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: main.c,v
Working file: main.c
head: 1.2
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total revisions: 2;	selected revisions: 2
description:
This is the main function
It will have an infinite while loop

In the while loop,we will call the mainmenu function and we will provide the choice
Based on the choice given,it will call the appropriate function to perform the required task
----------------------------
revision 1.2	locked by: root;
date: 2018/12/21 17:49:06;  author: root;  state: Exp;  lines: +9 -4
First we replaced all funcs with func ptrs.
we call the init() func.
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revision 1.1
date: 2018/12/20 09:48:51;  author: root;  state: Exp;
Initial revision
================================

manny170593 December 2018

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RCS file: mainmenu.c,v
Working file: mainmenu.c
head: 1.2
branch:
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	root: 1.2
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keyword substitution: kv
total revisions: 2;	selected revisions: 2
description:
In this  function,we will give the choice to perform the task
It will return the integer choice
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revision 1.2	locked by: root;
date: 2018/12/21 17:50:59;  author: root;  state: Exp;  lines: +1 -1
*** empty log message ***
----------------------------
revision 1.1
date: 2018/12/20 09:53:07;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: openfile.c,v
Working file: openfile.c
head: 1.1
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	root: 1.1
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keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
This function is used to open file to be compressed
It will take filename as argument
It will open the file to be compressed in read only mode and provide the file descriptor
It will return fd to compression func
----------------------------
revision 1.1	locked by: root;
date: 2018/12/20 09:58:59;  author: root;  state: Exp;
Initial revision
=============================================================================

RCS file: unique.c,v
Working file: unique.c
head: 1.2
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	root: 1.2
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keyword substitution: kv
total revisions: 2;	selected revisions: 2
description:
This func is used to check whether the character read is unique or not
This will use the for loop to compare character read with the character in masterarray
If character is already present in ma,then it will return 0 otherwise will store in ma.
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revision 1.2	locked by: root;
date: 2018/12/21 17:51:20;  author: root;  state: Exp;  lines: +3 -6
*** empty log message ***
----------------------------
revision 1.1
date: 2018/12/20 11:51:41;  author: root;  state: Exp;
Initial revision
==================================

jagritichaudhary258 December 2018

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RCS file: declaration.h,v
Working file: declaration.h
head: 1.6
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lyword substitution: kv
total revisions: 6;	selected revisions: 6
description:
this file would contain for all declarations in the project
declared mainmenu(),exitfunction(), compression(),decompression()
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revision 1.6	locked by: jchaudhary;
date: 2018/12/21 10:41:21;  author: jchaudhary;  state: Exp;  lines: +37 -1
declared pointers to all the functions
----------------------------
revision 1.5
date: 2018/12/20 06:04:02;  author: jchaudhary;  state: Exp;  lines: +1 -1
this h
this file would contain all the headers file
stdio.h string.h stdlib.h  unistd.h fcntl.h
----------------------------
revision 1.4
date: 2018/12/17 06:53:49;  author: jchaudhary;  state: Exp;  lines: +2 -1
added unique function
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revision 1.3
date: 2018/12/14 10:06:25;  author: jchaudhary;  state: Exp;  lines: +2 -2
*** empty log message ***
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revision 1.2
date: 2018/12/14 09:49:07;  author: jchaudhary;  state: Exp;  lines: +2 -1
changed return type of openfile function 
add new function createmasterarray
----------------------------
revision 1.1
date: 2018/12/12 13:21:40;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

jagritichaudhary258 December 2018

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p { margin-bottom: 0.1in; line-height: 120% }

RCS file: headers.h,v
Working file: headers.h
head: 1.1
branch:
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	jchaudhary: 1.1
access list:
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keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
this file contains all the included headers and macros
file list: stdio.h stdlib.h string.h unistd.h  fcntl.h
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/11 16:06:23;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: compression2.c,v
Working file: compression2.c
head: 1.1
branch:
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	jchaudhary: 1.1
access list:
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keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
openfile() createmasterarray() length(
replaced by pointers of functions
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/21 10:43:07;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: compression3.c,v
Working file: compression3.c
head: 1.1
branch:
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	jchaudhary: 1.1
access list:
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keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
this function  will  compress the targeted file when code length is less then 8
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/21 10:46:10;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: compression4.c,v
Working file: compression4.c
head: 1.1
branch:
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	jchaudhary: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
this function will be you to compress target file when code length is less then 16
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/22 06:29:45;  author: jchaudhary;  state: Exp;
Initial revision
===================

jagritichaudhary258 December 2018

@page { margin: 0.79in }
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p { margin-bottom: 0.1in; line-height: 120% }

Working file: compression5.c
head: 1.1
branch:
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	jchaudhary: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
this function will compress the file when code length is less then 32
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/21 10:50:07;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: compression6.c,v
Working file: compression6.c
head: 1.1
branch:
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	jchaudhary: 1.1
access list:
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keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
this function will compress the file when code length is less then 64
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/21 10:51:15;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: compression7.c,v
Working file: compression7.c
head: 1.1
branch:
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	jchaudhary: 1.1
access list:
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keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
this function will compress the file when code length is less then 128
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/21 10:52:08;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: compression.c,v
Working file: compression.c
head: 1.2
branch:
locks: strict
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keyword substitution: kv
total revisions: 2;	selected revisions: 2
description:
----------------------------
revision 1.2
date: 2018/12/20 06:56:05;  author: jchaudhary;  state: Exp;  lines: +2 -1
this function will use to compress file 
openfile function wil be cll to open the file to copress 
and openfile will return fd 
after that called  to createmasterarray function and passed fd to this function
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revision 1.1
date: 2018/12/17 07:14:17;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: createmasterarray.c,v
Working file: createmasterarray.c
head: 1.3
branch:
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	jchaudhary: 1.3
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symbolic names:
keyword substitution: kv
total revisions: 3;	selected revisions: 3
description:
----------------------------
revision 1.3	locked by: jchaudhary;
date: 2018/12/21 10:54:50;  author: jchaudhary;  state: Exp;  lines: +5 -5
malloc is replace by realloc
----------------------------
revision 1.2
date: 2018/12/21 06:24:06;  author: jchaudhary;  state: Exp;  lines: +4 -1
memory allocation updated
melloc function replaced by realloc function
----------------------------
revision 1.1
date: 2018/12/17 07:14:33;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: decompression.c,v
Working file: decompression.c
head: 1.1
branch:
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keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
this file will be use to decompress the file
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/20 07:07:10;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: exitfunction.c,v
Working file: exitfunction.c
head: 1.1
branch:
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keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
this function will be use to exit from the code in both situation(EXIT_SUCCESS & EXIT_FAILURE)
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/20 07:07:48;  author: jchaudhary;  state: Exp;
Initial revision
===================================

jagritichaudhary258 December 2018

@page { margin: 0.79in }
pre.cjk { font-family: "DejaVu Sans Mono", monospace }
p { margin-bottom: 0.1in; line-height: 120% }

RCS file: init.c,v
Working file: init.c
head: 1.1
branch:
locks: strict
	jchaudhary: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
this function contains initilization of all the functions
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/21 10:56:07;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: length.c,v
Working file: length.c
head: 1.3
branch:
locks: strict
	jchaudhary: 1.3
access list:
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keyword substitution: kv
total revisions: 3;	selected revisions: 3
description:
----------------------------
revision 1.3	locked by: jchaudhary;
date: 2018/12/22 05:40:32;  author: jchaudhary;  state: Exp;  lines: +23 -4
this function will count the code length or unique array and return an int value according to code length
----------------------------
revision 1.2
date: 2018/12/21 06:25:26;  author: jchaudhary;  state: Exp;  lines: +1 -1
this function will use count to code length using strlen()
and return an int value according to code length
----------------------------
revision 1.1
date: 2018/12/20 07:11:19;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: main.c,v
Working file: main.c
head: 1.2
branch:
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access list:
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keyword substitution: kv
total revisions: 2;	selected revisions: 2
description:
this is main function of code 
in the main
a mainmenu function will be call in a while(1) loop
mainmenu  is enter the choice
1 for compression
2 for decompression
0 for exit
mainmenu returns an int type value enter by the user 
and then work according to user choice
----------------------------
revision 1.2	locked by: jchaudhary;
date: 2018/12/22 05:45:11;  author: jchaudhary;  state: Exp;  lines: +6 -5
replaced all the function by the function pointers
----------------------------
revision 1.1
date: 2018/12/20 07:11:31;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

jagritichaudhary258 December 2018

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p { margin-bottom: 0.1in; line-height: 120% }

RCS file: mainmenu.c,v
Working file: mainmenu.c
head: 1.1
branch:
locks: strict
	jchaudhary: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
thil function  will be call from main and it wil display  chioces to use
1 for compression
2 for decompressinon
0 for exit
and return an int value to main entered by the user choice
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/20 07:19:14;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: openfile.c,v
Working file: openfile.c
head: 1.1
branch:
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	jchaudhary: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
this function will be use to open the  file and will  return fd
and ask to user to enter the file name
malloc to store file name
 .
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/20 08:09:07;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

RCS file: unique.c,v
Working file: unique.c
head: 1.1
branch:
locks: strict
	jchaudhary: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1;	selected revisions: 1
description:
----------------------------
revision 1.1	locked by: jchaudhary;
date: 2018/12/17 07:15:33;  author: jchaudhary;  state: Exp;
Initial revision
=============================================================================

taruna.chaudhary19 December 2018

RCS file: decleration.h,v
Working file: decleration.h
head: 1.2
branch:
locks: strict
root: 1.2
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total revisions: 2; selected revisions: 2
description:
In this declered all the functions declearations and their repective functions pointers defintions
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revision 1.2 locked by: root;
date: 2018/12/24 04:51:33; author: root; state: Exp; lines: +5 -2
declared a new function findLoc() with its function pointer.
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revision 1.1
date: 2018/12/21 09:44:32; author: root; state: Exp;
Initial revision
=============================================================================
taruna.chaudhary19 December 2018

RCS file: compress4.c,v
Working file: compress4.c
head: 1.2
branch:
locks: strict
root: 1.2
access list:
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keyword substitution: kv
total revisions: 2; selected revisions: 2
description:
This function will provide compression when code length will be 4
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revision 1.2 locked by: root;
date: 2018/12/24 04:40:56; author: root; state: Exp; lines: +38 -1
Entered file name for compressed data.
write a infinite loop which read a single character from file and find its location from findLoc() .
after some operations send the encrpted character to compress_file.
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revision 1.1
date: 2018/12/21 09:32:00; author: root; state: Exp;
Initial revision
===========================================================================
taruna.chaudhary19 December 2018

RCS file: compression.c,v
Working file: compression.c
head: 1.2
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locks: strict
root: 1.2
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keyword substitution: kv
total revisions: 2; selected revisions: 2
description:
calling openFile() to open the file.
getting fd from this func and print
Calling createMasterArray() and gived the opened file descriptor as arument.
This function should return the masterArray(). i.e. array of unique charact.
Captured thwe return value from creatMasterArray() and printed it.
This function would initiate the compression operation. Just checking mapping for now.
----------------------------
revision 1.2 locked by: root;
date: 2018/12/24 04:47:44; author: root; state: Exp; lines: +13 -10
find the length of ma and sent it to compress4 file
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revision 1.1
date: 2018/12/21 09:32:23; author: root; state: Exp;
Initial revision
========================================================================
taruna.chaudhary19 December 2018

RCS file: findLoc.c,v
Working file: findLoc.c
head: 1.1
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locks: strict
root: 1.1
access list:
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keyword substitution: kv
total revisions: 1; selected revisions: 1
description:
It receive a character and ma. find the character location from ma and send it to compress4()
----------------------------
revision 1.1 locked by: root;
date: 2018/12/24 04:48:50; author: root; state: Exp;
Initial revision
=============================================================================

RCS file: init.c,v
Working file: init.c
head: 1.2
branch:
locks: strict
root: 1.2
access list:
symbolic names:
keyword substitution: kv
total revisions: 2; selected revisions: 2
description:
This function initializez all function pointers with function names.
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revision 1.2 locked by: root;
date: 2018/12/24 04:49:37; author: root; state: Exp; lines: +1 -0
Assign a new function pointer to findLoc;
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revision 1.1
date: 2018/12/21 09:39:39; author: root; state: Exp;
Initial revision
taruna.chaudhary19 December 2018

RCS file: openFile.c,v
Working file: openFile.c
head: 1.2
branch:
locks: strict
root: 1.2
access list:
symbolic names:
keyword substitution: kv
total revisions: 2; selected revisions: 2
description:
This function is used by compression() to openFile in readmode.
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revision 1.2 locked by: root;
date: 2018/12/24 04:50:46; author: root; state: Exp; lines: +19 -8
write a function for O_WRONLY mode
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revision 1.1
date: 2018/12/21 09:42:55; author: root; state: Exp;
Initial revision
=============================================================================
rohitpawar870 December 2018

RCS file: decleration.h,v
Working file: decleration.h
head: 1.5
branch:
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rohitpawar: 1.5
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total revisions: 5; selected revisions: 5
description:
----------------------------
revision 1.5 locked by: rohitpawar;
date: 2018/12/26 14:06:57; author: rohitpawar; state: Exp; lines: +6 -6
replace all fuction decleration and declared their function pointer
----------------------------
revision 1.4
date: 2018/12/21 17:05:08; author: rohitpawar; state: Exp; lines: +39 -0
updated dcleration for creatmasterarray()
it now return char*
declared codelength()
----------------------------
revision 1.3
date: 2018/12/17 12:09:41; author: rohitpawar; state: Exp; lines: +2 -1
declared unique()
----------------------------
revision 1.2
date: 2018/12/14 09:16:57; author: rohitpawar; state: Exp; lines: +2 -1
include createmasterarray function
----------------------------
revision 1.1
date: 2018/12/13 10:08:28; author: rohitpawar; state: Exp;
Initial revision
===============================
rohitpawar870 December 2018

RCS file: compression.c,v
Working file: compression.c
head: 1.5
branch:
locks: strict
rohitpawar: 1.5
access list:
symbolic names:
keyword substitution: kv
total revisions: 5; selected revisions: 5
description:
----------------------------
revision 1.5 locked by: rohitpawar;
date: 2018/12/26 14:24:35; author: rohitpawar; state: Exp; lines: +2 -2
all function calls are now being done through function pointers.
----------------------------
revision 1.4
date: 2018/12/21 17:34:26; author: rohitpawar; state: Exp; lines: +20 -4
captured return value from createmasterarray() and pointed it
depending on code length, we call compress() using switch
all funtion calls using function pointers
----------------------------
revision 1.3
date: 2018/12/17 12:09:44; author: rohitpawar; state: Exp; lines: +10 -1
callling codelength() that takes ma as argument,return code length print code length
----------------------------
revision 1.2
date: 2018/12/14 09:18:38; author: rohitpawar; state: Exp; lines: +6 -2
calling createmasterarray () and give the append file descriptor as argument
the function should return the masterarray()
----------------------------
revision 1.1
date: 2018/12/13 10:08:29; author: rohitpawar; state: Exp;
Initial revision
=============================================================================
rohitpawar870 December 2018

RCS file: main.c,v
Working file: main.c
head: 1.2
branch:
locks: strict
rohitpawar: 1.2
access list:
symbolic names:
keyword substitution: kv
total revisions: 2; selected revisions: 2
description:
----------------------------
revision 1.2 locked by: rohitpawar;
date: 2018/12/21 17:57:29; author: rohitpawar; state: Exp; lines: +5 -4
callind init() for func pointer initialization
all function calls through function pointers
----------------------------
revision 1.1
date: 2018/12/13 10:08:31; author: rohitpawar; state: Exp;
Initial revision
=============================================================================
rohitpawar870 December 2018

CS file: openfile.c,v
Working file: openfile.c
head: 1.4
branch:
locks: strict
rohitpawar: 1.4
access list:
symbolic names:
keyword substitution: kv
total revisions: 4; selected revisions: 4
description:
----------------------------
revision 1.4 locked by: rohitpawar;
date: 2018/12/26 14:30:57; author: rohitpawar; state: Exp; lines: +7 -10
take filename as argument.
----------------------------
revision 1.3
date: 2018/12/21 17:51:11; author: rohitpawar; state: Exp; lines: +4 -8
use strncmp to compare the file open mode and open accordingly
----------------------------
revision 1.2
date: 2018/12/14 09:24:16; author: rohitpawar; state: Exp; lines: +1 -1
the function get open mode as argument and the file inappropriate mode
check for error
----------------------------
revision 1.1
date: 2018/12/13 10:08:30; author: rohitpawar; state: Exp;
Initial revision
=============================================================================
sourabhsagar7601 April 2021

Multiple Data Compression and Encryption using Iterative Techniques.

Aim:-
Predefined American Standard Code for Information Interchange ( ASCII ) discarded in order to make our own ASCII chart depending upon number of unique characters present in file.

Learning:-
~ Storage class
~ Low Level file I/O
~ Bit Manipulation
~ Generic Programming
~ Function pointers
~ Structure padding
~ Makefile

Project Design:-
I) Master Array Creation:
a) characters are read from source file and unique characters among them are collected in array names as MasterArray

b) As we know 256 unique characters can be represented in 8 bits. Now Suppose we got only 4 unique characters which can be represented in 2 bits by combination of 00,01,10,11 respectively

c) similarly, num of characters >=4 & less than 8 can be represented in 3 bits.Thus specific compression based on required bits is called

II) Compression -
a) characters are read from source file and there position is found in masterArray. Once found, integer index type casted to character of 8 bits

b) because of 4 bit compression, significant integer value is represented in 4 bits and remaining 4 bits are zero. Thus we extract these 4 bits and store in new character variable right nibble by OR operations

c) Then cycle for steps repeated for new character from source file. This time significant 4 bits are store in left nibble of character variable by OR operations

d) finally when character variable is filled completely we store it in compressed file.

e) Hence on repeating same for remaining character from source file

III) Decompression:
a) characters are read from compressed file

b) because of 4 bit compression, information store in both left and right nibble. We extract right nibble and store it in new character variable by OR operation

c) information extracted from right nibble is index of actual value present in masterarray

d) following conversion rule, value stored at index extracted and store to decompress file

e) Repeating cycle of steps for left nibble and remaining characters

Suggestion are welcome for further discussion.
gupta1996riya May 2021

[priyankagupta@localhost MDCPROJECT]$ ls
Compress.c Compstatics.c declarations.h Decompress.c DecompStatics.c exitfunc.c headers.h init.c main.c mainMenu.o makefile
Compress.o Compstatics.o declarations.h.gch Decompress.o DecompStatics.o exitfunc.o headers.h.gch init.o mainMenu.c main.o priyanka
[priyankagupta@localhost MDCPROJECT]$ make
gcc -c mainMenu.c headers.h declarations.h
gcc -c init.c headers.h declarations.h
gcc -c exitfunc.c headers.h declarations.h
gcc -c Compress.c headers.h declarations.h
gcc -c Compstatics.c headers.h declarations.h
gcc -o Mdcaeuit main.o mainMenu.o init.o exitfunc.o Compress.o Decompress.o Compstatics.o DecompStatics.o
/usr/bin/ld: init.o: in function `init':
init.c:(.text+0x40): undefined reference to `DecompressFile'
collect2: error: ld returned 1 exit status
make: *** [makefile:5: Mdcaeuit] Error 1
[priyankagupta@localhost MDCPROJECT]$

I can't determine the error where the problems come. And in headers.h file and declarations.h file when creating the make file and compile headers.h.gch and declarations.h.gch is generated why it should be?
gktejvan100 May 2021

.h.gch is the temprary file genrated by the your kernel. and error is your code is. please cheak the function body name of `DecompressFile'.
gupta1996riya May 2021

[priyankagupta@localhost MDCPROJECT]$ ls
Compress.c Compstatics.c declarations.h Decompress.c DecompStatics.c exitfunc.c headers.h init.c main.c mainMenu.o makefile priyanka
Compress.o Compstatics.o declarations.h.gch Decompress.o DecompStatics.o exitfunc.o headers.h.gch init.o mainMenu.c main.o Mdcaeuit
[priyankagupta@localhost MDCPROJECT]$ make
make: 'Mdcaeuit' is up to date.
[priyankagupta@localhost MDCPROJECT]$ ./Mdcaeuit
main: Begin
1
main: ./Mdcaeuit
main: (null)
init: Begin.
init: End
mainMenu: Begin
mainMenu:__MainMenu__
mainMenu:__1.Compress File__
mainMenu:__2.Decompress File__
mainMenu:__3.Compress Statistics__
mainMenu:__4.DeCompress Statistics__
mainMenu:__0.Exit program__
mainMenu:Please Enter the choice
1
CompressFile: Begin
CompressFile: End
mainMenu: End
mainMenu: Begin
mainMenu:__MainMenu__
mainMenu:__1.Compress File__
mainMenu:__2.Decompress File__
mainMenu:__3.Compress Statistics__
mainMenu:__4.DeCompress Statistics__
mainMenu:__0.Exit program__
mainMenu:Please Enter the choice
2
DecompressFile: Begin
DecompressFile: End
mainMenu: End
mainMenu: Begin
mainMenu:__MainMenu__
mainMenu:__1.Compress File__
mainMenu:__2.Decompress File__
mainMenu:__3.Compress Statistics__
mainMenu:__4.DeCompress Statistics__
mainMenu:__0.Exit program__
mainMenu:Please Enter the choice
3
CompressStatistics: Begin
CompressStatistics: End

All functions body is generated .o file but the headers and declaration file generated .gch file (temprary file how to create headers.o and declarations.o).
gupta1996riya May 2021

My problem is solve thank you @gktejvan100 for solving my doubts.
gupta1996riya May 2021

[priyankagupta@localhost MDCPROJECT]$ ls

Compress.c,v Decompress.c,v exitfunc.c,v headers.h,v main.c mainMenu.c makefile testproject.sh
Compstatics.c,v DecompStatics.c,v headers.h init.c,v main.c,v mainMenu.c,v priyanka

How to remove RCS files if once compile the program how to remove RCS file
gktejvan100 May 2021

use rm -f *.c,v command for delete the RCS file . and
.h file extension not genrate the objective file because in .h file declare the sevral function and define the macros and global variable etc. so conclusion that you are use headerfile in your code helps of these file make easy and understandable programe.
badhankit27 June 2021

hello everyone why i am getting this warning ?
---------->
$ make
gcc -c main.c
main.c: In function ‘main’:
main.c:14:18: warning: dereferencing ‘void *’ pointer
   14 |                 (*fptr[0](argv[1]));

#include"headers.h"
#include"declerations.h"

int main(int argc, char *argv[])
{
        printf("%s : Begain\n",__func__);

        printf("%d\n", argc);
        printf("%s\n", argv[0]);
        printf("%s\n", argv[1]);

        init();
        while(1)
                (*fptr[0](argv[1]));

        printf("%s : End\n",__func__);
        return 0;
}
gupta1996riya June 2021

(*fptr[0](argv[1]));
there is the single double bracket )) you can remove single bracket.
avnish57572 July 2021

( -bash: ./ test: /bash/bash: bad interpreter: No such file or directory ) in this I make test script but it is not run what is the error and give me feasible solution .
sharavanraj209 December 2021

declarations.h: In function ‘mainMenu’:
declarations.h:32:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘extern’
   32 | extern void* exitFunc(void*)
      | ^~~~~~
declarations.h:30:23: error: parameter name omitted
   30 | extern void* mainMenu(void*)

please anyone solve error.

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