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Category Archives: Project 2: Multiple Data Compression and Encryption

In computer science and information theory, data compression, source coding, or bit-rate reduction involves encoding information using fewer bits than the original representation. Compression can be either be lossy or lossless. Lossless compression reduces bits by identifying and eliminating statistical redundancy. No information is lost in lossless compression. Lossy compression reduces bits by identifying marginally important information and removing it. The process of reducing the size of a data file is popularly referred to as data compression, although its formal name is source coding (coding done at the source of the data, before it is stored or transmitted).

Multiple data compression (upto code length calculation)

RCS file: mdc_using_functions.c,v Working file: mdc_using_functions.c head: 1.4 branch: locks: strict access list: symbolic names: keyword substitution: kv total revisions: 4;     selected revisions: 4 description: reading characters from the file & adding to the master array —————————- revision 1.4 date: … Continue reading

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Multiple Data Compression completed upto Code Length Calculation

RCS file: mdc.c,v Working file: mdc.c head: 1.5 branch: locks: strict access list: symbolic names: keyword substitution: kv total revisions: 5; selected revisions: 5 description: This is the program with an array storing all the present characters in the file. … Continue reading

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mdc : completed upto code length calculation.

1 2 RCS file: mdc.c,v 3 Working file: mdc.c 4 head: 1.9 5 branch: 6 locks: strict 7 access list: 8 symbolic names: 9 keyword substitution: kv 10 total revisions: 9;     selected revisions: 9 11 description: 12 Creating the rcs … Continue reading

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MDC : adding only the distinct characters to the master array.

1 2 RCS file: mdc.c,v 3 Working file: mdc.c 4 head: 1.5 5 branch: 6 locks: strict 7 access list: 8 symbolic names: 9 keyword substitution: kv 10 total revisions: 5;     selected revisions: 5 11 description: 12 Creating the rcs … Continue reading

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project 1 : MDC

Added the characters of file to the master array. created a script for bash shell to execute the repeated commands quickly.

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MDC using IPC

RCS file: sender.c,v Working file: sender.c head: 1.7 branch: locks: strict akshat: 1.7 access list: symbolic names: keyword substitution: kv total revisions: 7;    selected revisions: 7 description: MDC using IPC. In this project msg send to other process will be … Continue reading

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MULTIPLE DATA COMPRESSION 3-bit (2 key encryption)

Working file: ./header.h head: 1.3 branch: locks: strict root: 1.3 access list: symbolic names: keyword substitution: kv total revisions: 3;     selected revisions: 3 description: in this file i had compressed the data of 3 bit codelength ie max 8 distinct … Continue reading

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process is set to default..causing termination of process.

RCS file: ./ignore_sigint.c,v Working file: ./ignore_sigint.c head: 1.2 branch: locks: strict root: 1.2 access list: symbolic names: keyword substitution: kv total revisions: 2;    selected revisions: 2 description: ignore the signal using SIG_DFL. —————————- revision 1.2    locked by: root; date: 2014/03/11 … Continue reading

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STRUCTURES

STRUCTURES is basically a user define datatype. it is a collection of elements of different datatype stored in continues memory location. SYNTAX: struct name { type element; type element; }; struct name variable; where struct is a keyword. name is … Continue reading

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Multiple Data Compression

This is very impressive project, i have ever done. As decompression is the reverse process of compression i.e. whatever be the procedure we follow during the compression, the reverse procedure will be follows during the decompression. During this projects i … Continue reading

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multiple data compression-decompression 4-bit

RCS file: ./mdcaeuit.c,v Working file: ./mdcaeuit.c head: 1.17 branch: locks: strict root: 1.17 access list: logins symbolic names: keyword substitution: kv total revisions: 17;    selected revisions: 17 description: this is the initiated source file have to make ammendment —————————- revision … Continue reading

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Linklist using functions

1 2 RCS file: heaher.h,v 3 Working file: heaher.h 4 head: 1.1 5 branch: 6 locks: strict 7 access list: 8 symbolic names: 9 keyword substitution: kv 10 total revisions: 1; selected revisions: 1 11 description: 12 gave parameters for … Continue reading

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MDC : Multiple data compression using iterative techniques

RCS file: mdc.c,v Working file: mdc.c head: 1.1 branch: locks: strict root: 1.1 access list: symbolic names: keyword substitution: kv total revisions: 1;    selected revisions: 1 description: implemented open ,read,master array functions. —————————- revision 1.1    locked by: root; date: 2014/02/20 … Continue reading

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project 1

reading file from file discriptor. creating buffer to store characters from text file. sorting unique chaacters and saving them into master array.

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Project 01-Multiple Data Compression & encryption using iterative technique.

RCS file: ./header.h,v Working file: ./header.h head: 1.4 branch: locks: strict root: 1.4 access list: symbolic names: keyword substitution: kv total revisions: 4;    selected revisions: 4 description: give prototyp for open_file(). give prototyp for read_file(). —————————- revision 1.4    locked by: … Continue reading

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