Hello ,
I finished writing two programs , One will split a file into a specified number of pieces .Gonna study some file compression algorithm .
I later thought its a waste of time writing another file compression alogol so used gzip itself . And if i have to change to new algo i made the usage of gzip modular so that any new algol can be integerated as a seperate module . 
SPLITTER
#include<stdio.h>
#include<unistd.h>
#include<string.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<fcntl.h>
int fd=0,err=0,file_size=0;
int block_numbers=0;
char buffer[1024];
char tno[5];
//Argument 1 is File to split
//Argument 2 is block sizes in mb
int main(int argc,char *argv[])
{
int i,j,k,tfd,fileno=1,byte_count=0,nob=0,mb=0,err=0;
struct stat buf;
char dest[25]=”../dumps/dest”;
char filename[25],*arg[20];
arg[0]=(char *)malloc(5); // gzip
arg[1]=(char *)malloc(5); // file name
arg[2]=(char *)malloc(5);
arg[0]=”gzip”;
arg[2]=NULL;
for(i=0;i<1024;i++){
buffer[i]=”;
if(i<25){
dest[i]=filename[i]=”;
if(i<5){
tno[i]=”;
}
}
}
if(argc > 2){
mb=atoi(argv[2]);
strcpy(dest,argv[1]);
strcat(dest,”.abe”);
if( mkdir(dest,0777) >=0 ){
strcat(dest,”/dest”);
strcpy(filename,dest);
//strcpy(dest,argv[2]);
}
else{
perror(”");
printf(”\nDirectory Creation Failure . Program Exitting \n”);
//strcpy(dest,”../dumps/dest”);
//strcpy(filename,dest);
exit(0);
}
fd=open(argv[1],O_RDONLY);
if(fd==-1){
perror(”Main File:”);
exit(0);
}
err=fstat(fd,&buf);
if(err==-1){
perror(”First stat:”);
}
printf(”\nThe size of the file is : %d”,buf.st_size);
file_size=buf.st_size;
block_numbers=file_size/(1024*1024*mb);//Last Param is number of MS’s
block_numbers++;
printf(”\nThere will be %d “,block_numbers);
printf(”block/blocks \n”);
k=block_numbers;
strcpy(filename,dest);
itoa(fileno,&tno);
strcat(filename,tno);
tfd=open(filename,O_RDWR | O_CREAT , 0666);
if(tfd<0){
perror(”Temp File:”);
}
while((nob = read(fd,&buffer,1024))>0 ){
//write to file
err=write(tfd,&buffer,nob);
if(err<0){
perror(”Tfile Write :”);
}
byte_count+=nob;
//flush buffer
flush_buf();
//open new file
if(byte_count==1024 * 1024 * mb){
byte_count=0;
close(tfd);
//Zip the closed file
strcpy(arg[1],filename);
if(!fork()){
execvp(”gzip”,arg);
}
else{
fileno++;
flush_buf();
itoa(fileno,&tno);
for(i=0;i<25;i++){
filename[i]=”;
}
strcpy(filename,dest);
strcat(filename,tno);
tfd=open(filename,O_RDWR | O_CREAT , 0666);
if(tfd<0){
perror(”Tfile Creation “);
}
}//Else of Fork
}
nob=0;
}
strcpy(arg[1],filename);
if(!fork()){
execvp(”gzip”,arg);
}
}
else{
write(1,”Enter all the parammters . Program quitting”,20);
exit(0);
}
return 0;
}
// Convert the integer to string
void itoa(int a ,char *p)
{
int i,j,k;
char s[5];
s[0]=s[1]=s[2]=s[3]=s[4]=”;
k=a;i=0;
while(a>0){
j=a%10;
a=a/10;
s[i]=j+48;
i++;
}
// Reverse it
i=0;
j=0;
while(s[i]!=”){
i++;
}
for(k=0;k<i;k++,i–){
p[k]=s[i-1];
}
}
void flush_buf()
{
int i=0;
for(i=0;i<1024;i++){
buffer[i]=”;
}
}
MERGER
#include<stdio.h>
#include<fcntl.h>
#include<dirent.h>
char buffer[1024];
//Argument 1 Directory path relative to the excutable
int main(int argc,char *argv[])
{
int fd,mfd,err,i,j,nob=0,file_count=0,status;
char source[30],final[30],f_name[30],fi[5],*arg[5];
DIR *dp=NULL;
struct dirent *bf=NULL;
arg[0]=(char *)malloc(10); //GZIP
arg[1]=(char *)malloc(10); //OPTIONS FOR UNZIPPING
arg[2]=(char *)malloc(30); //FILE NAME
arg[3]=(char *)malloc(10); //NULL
arg[0]=”gzip”;
arg[1]=”-d”;
arg[3]=NULL;
for(i=0;i<30;i++){
f_name[i]=final[i]=source[i]=”;
if(i<5){
fi[i]=”;
}
}
if(argc<2){
printf(”\nInsufficient parameters : Program Quitting\n”);
exit(0);
}
strcpy(source,argv[1]);
for(i=29;i>0;i–){
if(source[i]==’.'){
break;
}
}
for(j=0;j<i;j++){
final[j]=source[j];
}
strcat(final,”merged”);
dp=opendir(source);
if(dp==NULL){
perror(”Directory “);
}
mfd=open(final,O_WRONLY | O_CREAT , 0666);
if(mfd<0){
perror(”Main File”);
}
flush_buf();
while( ( bf=readdir(dp) ) > 0 ){
if(strcmp(bf->d_name,”.”) && strcmp(bf->d_name,”..”)){
file_count++;
strcpy(arg[2],”/home/unni/dinesh/test/”);
strcat(arg[2],source);
strcat(arg[2],”/”);
strcat(arg[2],bf->d_name);
if(!fork()){
execvp(”gzip”,arg);
perror(”");
}
else{
waitpid(-1,&status,0);
}
}
}
for(i=0;i<file_count;i++){
strcpy(f_name,source);
strcat(f_name,”/dest”);
itoa(i+1,&fi);
strcat(f_name,fi);
//printf(”\n\n %s \n\n “,f_name);
fd=open(f_name,O_RDONLY);
if(fd<0){
perror(”Temp File”);
}
while(nob=read(fd,&buffer,1024)){
err=write(mfd,&buffer,nob);
if(err<0){
perror(”Write “);
exit(0);
}
flush_buf();
}
close(fd);
sleep(1);
}
close(mfd);
return 0;
}
void itoa(int a ,char *p)
{
int i,j,k;
char s[5];
s[0]=s[1]=s[2]=s[3]=s[4]=”;
k=a;i=0;
while(a>0){
j=a%10;
a=a/10;
s[i]=j+48;
i++;
}
// Reverse it
i=0;
j=0;
while(s[i]!=”){
i++;
}
for(k=0;k<i;k++,i–){
p[k]=s[i-1];
}
}
void flush_buf()
{
int i=0;
for(i=0;i<1024;i++){
buffer[i]=”;
}
}
Good bye
.
