Tarstats-pp-1 Prototyping: Parse all items of a tarball

- no loop yet. jumped to second item and parsed it's header.
This commit is contained in:
Marcel Nowicki
2022-02-07 21:43:46 +01:00
parent 2bbfa75a7e
commit b985fc0c8f

View File

@@ -23,11 +23,11 @@ int main(int argc, char** argv) {
std::cout << "Error opening file" << std::endl;
// Tar spec is working with continous 512 byte size blocks. Header is 512 bytes.
int headersize = 512;
int buffersize = 512;
//Read header of first item in tar archive
char* headbuffer = new char[headersize];
datei.read(headbuffer, headersize);
char* headbuffer = new char[buffersize];
datei.read(headbuffer, buffersize);
// Read name of the next item
std::string itemname(&headbuffer[0], 100);
@@ -66,10 +66,54 @@ int main(int argc, char** argv) {
power--;
}
// uint64_t locationtonextfile{};
/* find out how often 512 bytes have to be read until the next header begins. Itemcontents are filled with '0' to
* fill the next 512 byte block
*/
int filereadcount = (itemsize / buffersize) + 1;
char* itembuffer = new char[buffersize];
while (filereadcount >= 0){
datei.read(itembuffer, buffersize);
filereadcount--;
}
delete[] itembuffer;
delete[] headbuffer;
headbuffer = new char[buffersize];
datei.read(headbuffer, buffersize);
std::string itemname2 (&headbuffer[0], 100);
std::erase(itemname2, '\0');
std::string itemtype2{};
switch (headbuffer[156]){
case '0': case '\0':
itemtype2 = "FILE";
break;
case '1':
itemtype2 = "HARDLINK";
break;
case '2':
itemtype2 = "SYMLINK";
break;
case '5':
itemtype2 = "DIRECTORY";
break;
default:
itemtype2 = "OTHER";
break;
}
//Printing to stdout
std::cout << itemname << std::endl;
std::cout << itemtype << std::endl;
std::cout << itemsize << " Bytes" << std::endl;
std::cout << itemname2 << std::endl;
std::cout << itemtype2 << std::endl;
return 0;
}