void FS::copy(FileDescriptor src_file, FileDescriptor & dst_fold, std::string dst_filename){
Block * src_block = new Block(src_file.first_block, config.block_size, _root);
read_data(&src_file, sizeof(FileDescriptor), src_block);
char * data = new char[src_file.size];
read_data(data, src_file.size, src_block);
FileDescriptor file;
Block * file_block = get_free_block();
write_data(&file, sizeof(FileDescriptor), file_block);
write_data(data, src_file.size, file_block);
Block * dst_block = new Block(dst_fold.first_block, config.block_size, _root);
bool found = false;
for(auto it = DirIterator(*this, dst_fold); it != DirIterator(*this); ++it){
FileDescriptor f = *it;
if (std::string(f.filename) == dst_filename ){
if( f.directory){
found = true;
dst_fold = f;
dst_block = new Block(dst_fold.first_block, config.block_size, _root);
} else{
throw std::runtime_error("File already exist");
}
}
}
file.first_block = file_block->get_index();
if(!found){
file.set_filename(dst_filename);
} else{
file.set_filename(src_file.filename);
}
file.parent_file = dst_fold.first_block;
file.size = src_file.size;
file.directory = src_file.directory;
if(dst_fold.first_child != -1){
Block * nb = new Block(dst_fold.first_child, config.block_size, _root);
FileDescriptor nd;
read_data(&nd, sizeof(FileDescriptor), nb);
nd.prev_file = file.first_block;
update_descriptor(nd,nb);
file.next_file = nd.first_block;
}
dst_fold.first_child = file.first_block;
update_descriptor(dst_fold, dst_block);
update_descriptor(file, file_block);
if(src_file.directory){
for(auto it = DirIterator(*this, src_file); it != DirIterator(*this); ++it){
FileDescriptor f = *it;
copy(f, file, f.filename);
}
}
}
void FS::import(std::string host_file, std::string fs_file){
if (!initialized) {throw "Not initialized";}
read_meta();
if(fs_file[fs_file.size() - 1] == '/'){
fs_file = fs_file.substr(0, fs_file.size() - 1);
}
int last_match = fs_file.find_last_of("/");
std::string fs_file_path = fs_file.substr(0, last_match + 1);
std::string fs_file_name = fs_file.substr(last_match + 1);
FileDescriptor dst_fold = get_file(fs_file_path, false, false);
Block * dst_block = new Block(dst_fold.first_block, config.block_size, _root);
for(auto it = DirIterator(*this, dst_fold); it != DirIterator(*this); ++it){
FileDescriptor file = *it;
if (std::string(file.filename) == fs_file_name ) throw std::runtime_error("File already exist");
}
FileDescriptor file;
Block * file_block = get_free_block();
std::ifstream File (host_file, std::ios::in | std::ios::binary);
if( File.fail() ) throw std::runtime_error("Can't open " + host_file);
File.seekg( 0, std::ios::end );
int fileLen = File.tellg();
file.size = fileLen;
File.seekg( 0, std::ios::beg);
char * data = new char[fileLen];
File.read(data, fileLen);
if(File.fail()) throw std::runtime_error("Can't read file " + host_file);
File.close();
write_data(&file, sizeof(FileDescriptor), file_block);
write_data(data, fileLen, file_block);
file.directory = false;
file.set_filename(fs_file_name);
file.first_block = file_block->get_index();
file.parent_file = dst_fold.first_block;
file.prev_file = -1;
file.next_file = -1;
if(dst_fold.first_child != -1){
Block * nb = new Block(dst_fold.first_child, config.block_size, _root);
FileDescriptor nd;
read_data(&nd, sizeof(FileDescriptor), nb);
nd.prev_file = file.first_block;
update_descriptor(nd,nb);
file.next_file = nd.first_block;
}
dst_fold.first_child = file.first_block;
update_descriptor(dst_fold, dst_block);
update_descriptor(file, file_block);
write_meta();
}
void FS::format(){
if (!initialized) {throw "Not initialized";}
meta.block_map_size = config.block_no/8 + 1;
meta.block_map = new char[meta.block_map_size];
memset(meta.block_map, 0, sizeof(char)*meta.block_map_size);
int free_space_size = config.block_size - sizeof(BlockDescriptor);
int no_of_blocks = (sizeof(meta) + meta.block_map_size)/free_space_size + 1;
meta.root_block = no_of_blocks;
for(int i = 0; i<no_of_blocks; ++i) reserve_block(i);
FileDescriptor root;
root.set_filename("/");
root.first_block = meta.root_block;
write_data(&root, sizeof(FileDescriptor), 0);
write_meta();
}
FileDescriptor FS::get_file(std::string path, bool create, bool file_available){
if( path[path.size() - 1] != '/' ){
path.push_back('/');
}
int pos;
pos = path.find('/');
if (pos != 0){ throw std::runtime_error("Bad path"); }
path.erase(0, 1);
FileDescriptor curr_dir;
Block * curr_dir_block = new Block(meta.root_block, config.block_size, _root);
read_data(&curr_dir, sizeof(curr_dir), curr_dir_block);
while(path.size() != 0){
pos = path.find('/');
std::string dir_name = path.substr(0, pos);
bool found = false;
for(auto it = DirIterator(*this, curr_dir); it != DirIterator(*this); ++it){
FileDescriptor file = *it;
if(std::string(file.filename) == dir_name){
found = true;
if(!file.directory){
if(file_available && pos == (int)path.size() - 1){
return file;
}else{
throw std::runtime_error("File in path");
}
}
curr_dir = file;
}
}
if(!found){
if( create ){
Block * dir_block = get_free_block();
FileDescriptor dir;
dir.set_filename(dir_name);
dir.first_block = dir_block->get_index();
dir.parent_file = curr_dir.first_block;
if( curr_dir.first_child == -1 ){
curr_dir.first_child = dir.first_block;
} else{
Block * neighbour_file_block = new Block(curr_dir.first_child, config.block_size, _root);
curr_dir.first_child = dir.first_block;
FileDescriptor neighbour_file_descriptor;
read_data(&neighbour_file_descriptor, sizeof(FileDescriptor), neighbour_file_block);
dir.next_file = neighbour_file_descriptor.first_block;
neighbour_file_descriptor.prev_file = dir.first_block;
update_descriptor(neighbour_file_descriptor, neighbour_file_block);
}
update_descriptor(curr_dir, curr_dir_block);
curr_dir = dir;
write_data(&dir, sizeof(FileDescriptor), dir_block);
} else{
throw std::runtime_error("No such file or directory");
}
}
curr_dir_block = new Block(curr_dir.first_block, config.block_size, _root);
path.erase(0, pos + 1);
}
return curr_dir;
}
