#include<stdio.h>
#include<stdlib.h>
#include<fcntl.h>
#include<string.h>
#define QUIT 5
int get_menu_choice ( void );
int main()
{
//buffer for the text/binary to be stored//
unsigned char buffer[10000];
// to store the number of characters to read/write "for fread/fwrite//
int n;
//char to store the user input for system output//
char input[4] = "ls";
//int to store the user choice//
int choice = 0 ;
//name of new archive is held//
char archive_name[256];
//name of the original file is held//
char original_file[256];
//name of archive is held//
char archive[256];
//name of archive that is going to be extracted is held//
char xarchive[256];
//name of the file that is extracted is held//
char extracted[256];
long size;
//points to the original file that's is to be copied//
FILE *original_pointer = NULL;
//points to the copied file//
FILE *copy_pointer = NULL;
//points to created archive//
FILE *create_pointer = NULL;
//points to the open file//
FILE *open_pointer = NULL;
//points to the stored archive//
FILE *archive_pointer = NULL;
//points to the extracted file//
FILE *copy = NULL;
//points to the open extracted file//
FILE *open_xtractcp = NULL;
//points to the archive that's about to be extracted//
FILE *xtract = NULL ;
FILE *fileinfo =NULL ;
while (choice != QUIT )
{
//brings up the menu//
choice = get_menu_choice();
if (choice == '1')
{
while(1) //while true//
{
puts("please give your archive a name and a path:\n");
scanf("%s", archive_name);
//try to open the file for reading, sees if its able to read it, if its not = to NULL then file already exist //
if(( create_pointer = fopen(archive_name, "r")) != NULL)
{
printf("file already exists\n");
continue;
fclose(create_pointer);
}
//if file does not already exist then creates the file//
create_pointer = fopen( archive_name, "wb");
fclose(create_pointer);
puts("archive created\n");
puts("please select the file you want to be copied into your archive\n");
scanf("%s",original_file);
//try to open the file for reading, sees if its able to read it, if its = to NULL then file does not exist //
if((original_pointer = fopen(original_file,"r")) == NULL)
{
puts("file does not exist");
break;
}
//opens the file for appending//
original_pointer = fopen(original_file,"a+b");
copy_pointer = fopen( archive_name,"a+b");
/*fread and write have 4 arguments first is the char variable where text
can be stored, the second specifies the size of the chunks of text to
read or write at a time, third argument specifies total numbers of
characters to read or write and 4t argument is a file pointer to the file to work with*/
//reads the selected file//
while (( n=fread(buffer,1,sizeof buffer, original_pointer)) > 0)
{
//writes to the archive//
fwrite(buffer,1, n , copy_pointer);
}
fseek(copy_pointer, 0, SEEK_END);
size = ftell(copy_pointer);
rewind(copy_pointer);
printf("File size: %ld\n bytes ", size);
if(original_pointer !=NULL)
{
fclose(original_pointer);
}
if(copy_pointer != NULL)
{
fclose(copy_pointer);
}
printf("done..... %s copied to %s.\n",original_file,archive_name);
puts("ctrl + c to quit or continue to create another archive");
if (original_pointer == NULL)
{
puts("unable to open original file\n");
}
if (copy_pointer == NULL)
{
puts("unable to open copied file");
}
puts("ctrl + c to quit or continue to create another archive");
continue;
}
}
if (choice == '2')
{
while(1)
{
puts("please open your archive that you want to extract\n");
scanf("%s",xarchive);
if(( xtract = fopen(xarchive,"r")) == NULL)
{
puts("archive does not exists");
break;
}
else
xtract = fopen(xarchive,"a+b");
puts("enter the path and/or file name where you want to save your extracted file as");
scanf("%s",extracted);
if((open_xtractcp = fopen(extracted,"r")) !=NULL)
{
puts("file exists");
break;
}
open_xtractcp = fopen(xarchive,"a+b");
copy = fopen(extracted,"w+b");
while (( n = fread(buffer,1,sizeof buffer, open_xtractcp)) > 0)
{
fwrite(buffer,1, n , copy);
}
if((open_xtractcp !=NULL) && (copy != NULL))
{
fclose(open_xtractcp);
fclose(copy);
printf("done..... %s extracted to %s.\n",xarchive,extracted);
puts("ctrl+c to exit or continue extracting another archive");
}
if (open_xtractcp == NULL)
{
puts("unable to open archive\n");
}
if (xtract == NULL)
{
puts("unable to extract");
}
continue;
}}
if(choice == '3')
{
while(1)
{
puts("please open your archive\n");
scanf("%s",archive);
if((archive_pointer = fopen(archive,"r")) ==NULL)
{
puts("archive does not exist");
break;
}
archive_pointer = fopen( archive, "a+b");
puts("please select the file you want to be copied into your archive\n");
scanf("%s",original_file);
if((open_pointer = fopen( original_file, "r"))==NULL)
{
puts("file does not exists");
break;
}
open_pointer = fopen(original_file,"a+b");
copy_pointer = fopen( archive,"a+b");
while (( n = fread(buffer,1,sizeof buffer, open_pointer)) > 0)
{
fwrite(buffer,1, n , copy_pointer);
}
if(open_pointer !=NULL)
{
fclose(open_pointer);
printf("done..... %s copied to %s.\n",original_file,archive);
puts("ctrl + c to exit or continue to add to archive ");
}
if (copy_pointer != NULL)
{
fclose(copy_pointer);
}
if (open_pointer == NULL)
{
puts("unable to open file\n");
}
if (copy_pointer == NULL)
{
puts("unable to open copied file");
}
continue;
}
}
if(choice == '4')
{
printf("\ntype 'ls' to see your what's in your current directory \n ");
scanf("%s", input);
if(!strcmp(input,"ls"))
{
system(input);
return 0;
}
else
{
puts("only type in ls\n\n");
continue;
}
}
if (choice == '5')
puts("you chose to quit\n");
return 0;
}}
int get_menu_choice( void )
{
char select = 0;
do
{
printf("\n");
printf("\n1 - create archive\n");
printf("\n2 - extract archive\n");
printf("\n3 - add to archive\n");
printf("\n4 - view what's in your current directory\n");
printf("\n5 - Quit");
printf("\n");
printf("\nEnter a selection: " );
scanf("%c", &select);
}
//if select is a number between 1 and 5 it will return select//
while (select < '1' || select > '5') ;
return select;
}
$ echo "FILE 1 CONTENT" > file1 $ echo "FILE 2 CONTENT" > file2 $ tar -cf arch.tar file1 file2 $ cat arch.tar file10000644000175000017500000000001711515361562011622 0ustar mclarkemclarkeFILE 1 CONTENT file20000644000175000017500000000001711515361567011630 0ustar mclarkemclarkeFILE 2 CONTENT
Unsigned Int intFileSize
Unsigned Int intFileNameLength
String strFileName
File fSourceFile
File fTargetFile
Files fSourceFiles
fSourceFiles = getFiles()
fTargetFile = newFile()
For Each fSourceFile In fSourceFiles
intFileSize = fileSize(fSourceFile)
strFileName = fSourceFile.FileName
intFileNameLength = Length(strFileName)
fTargetFile.Write(intFileSize + intFileNameLength + strFileName)
fTargetFile.Write(fSourceFile)
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