/*
* Takes in the following parameters
* File - The file to en-/decode
* Key - file containing the key used for en-/decoding the file
*/
int main (int argc, char **argv) {
// Check if the program was started with two parameters (file and key)
if (argc == 3){
FileContainer files;
int securityDistance;
if (checkFiles(argv) != 0) {
files = openAndReadKey(argv[2]);
char action = getUserInput();
int choice = encodeOrDecode(action);
switch (encodeOrDecode(action)) {
case 0:
printMessage(TYPE_INFO, CHOICE_EXIT);
free(files.key);
exit(0);
case 1:
securityDistance = getWantedSecLvl();
printMessage(TYPE_INFO, INFO_ENCODING_START);
encodeFile(files, argv[1], securityDistance);
printMessage(TYPE_INFO, INFO_ENCODING_END);
break;
case 2:
printMessage(TYPE_INFO, INFO_DECODING_START);
decodeFile(files, argv[1]);
printMessage(TYPE_INFO, INFO_DECODING_END);
break;
default:
break;
}
}
} else {
printMessage(TYPE_ERROR, ERROR_PARAMETERS);
}
return 0;
}
/* Processes the command line arguments and calls the appropriate function from
* lzw.h */
int main(int argc, char** argv)
{
MODE mode; /* indicates whether lzw is called as encode or decode */
// check argv[0] to see if it's encode or decode
if(argc == 0 || (mode = encodeOrDecode(argv[0])) == INVALID)
{
argsError();
return INVALID_ARGS;
}
else if(mode == DECODE)
{
if(argc > 1) // decode cannot have additional args
{
argsError();
return INVALID_ARGS;
}
else
{
if(!decode())
{
fprintf(stderr, "Error on decode; invalid encoded stream\n");
return FAILED_DECODE;
}
}
}
else // mode == ENCODE
{
long maxBits = 0; // value of -m argument, or 0 if there's no -m
long window = 0; // value of -p argument, or 0 if there's no -p
bool eFlag = false; // true if -e flag has been seen
// iterate over args
for(unsigned int i = 1; i < argc; i++)
{
FLAG argType = checkFlag(argv[i]);
switch(argType)
{
case M:
i++;
if(i >= argc || // there is no following number arg
(maxBits = checkNumArg(argv[i])) <= 0)
{
argsError();
return 1;
}
else
{
// maxBits is a positive int; now set to correct value
// if out of range
if(maxBits <= 8 || maxBits > 24)
{
maxBits = 12;
}
}
break;
case P:
i++;
if(i >= argc || // there is no following number arg
(window = checkNumArg(argv[i])) <= 0)
{
argsError();
return 1;
}
break;
case E:
eFlag = true;
break;
default:
argsError();
return 1;
}
}
if(!maxBits) // if maxBits wasn't set, default to 12
{
maxBits = 12;
}
encode(maxBits, window, eFlag);
}
return SUCCESS;
}
