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struct Buffer {
const char *name;
Page *storage;
Buffer(const char *name) : name(name), storage(new Page()) {}
void free_storage() {
while (storage) {
Page *iter = storage;
storage = storage->next;
delete iter;
}
}
void read_file(const char *pathname) {
free_storage();
File file(pathname, O_RDONLY);
storage = new Page();
int bytes_read = file.recv(storage->elements, PAGE_SIZE);
Page *iter = storage;
while (bytes_read > 0) {
iter->gap_start = bytes_read;
iter->element_count = bytes_read;
iter->next = new Page();
iter->next->prev = iter;
iter = iter->next;
bytes_read = file.recv(iter->elements, PAGE_SIZE);
}
if (iter->element_count == 0) {
delete iter;
}
}
void write_file(const char *pathname) {
File file(pathname, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
Page *iter = storage;
while (iter) {
file.send(iter->elements, iter->gap_start);
file.send(iter->elements + iter->gap_end, PAGE_SIZE - iter->gap_end);
iter = iter->next;
}
}
};
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