TEXT COMPRESSION in C Aglorithm | Computer Graphics Lab Manual | IT department | Final Year

AIM:

To perform text compression iv Java.

ALGORITHM:

1. Start the program

2. Create 2 files as input and output and enter text in input file.

3. Calculate length of input file and compress it.

4. If f<0 br="" compression="" fails.="">
5. Else displays the compressed text in output file.

6. Stop the program.

SOURCE CODE:

import java.io.*;

import java.util.zip.*;

class compress

{

public static void main(String args[]) throws Exception

{

try

{

String a,b;

System.out.println("\nEnter the input file name:");

InputStreamReader cread=new InputStreamReader(System.in);

BufferedReader cin=new BufferedReader(cread);

a=cin.readLine();

System.out.println("\nEnter the output file:");

b=cin.readLine();

FileInputStream fis=new FileInputStream(a);

FileOutputStream fos=new FileOutputStream(b);

GZIPOutputStream gzos=new GZIPOutputStream(fos);

int temp=fis.read();

while(temp!=-1)

{

gzos.write(temp);

temp=fis.read();

}

gzos.close();

fos.close();

File f1=new File(a);

File f2=new File(b);

long f11=f1.length();

long f21=f2.length();

long f=f21-f11;

if(f<0 br="">
{

System.out.println("Compression Failed");

System.out.println("The file has gained "+f+"bytes");

}

else

{

System.out.println(" ");

System.out.println("File has been compressed");

System.out.println("Original size is :"+f21+"bytes");

System.out.println("Compressed size is :"+f11+"bytes");

long ds;

ds=(f21-f11);

System.out.println("Difference in size is :"+ds+"bytes");

float cr;

cr=(((f21-f11)*100)/f21/1f);

System.out.println("Compression ratio is "+cr+"%");

}

}

catch(Exception e)

{

System.out.println("Exception"+e);

}



}}