task 1

myfs_1.py

+from myfs_1 import (
+    _get_num_files, _set_num_files, NoFreeSpace, NoFile, EmptyFile, 
+    HEADER_START, FILE_ENTRY_SIZE, FILE_BLOCK_SIZE, MAX_FILES
+)
+
+def save(f, filename, content):
+    """
+    Saves a file with the given content to the file system, locating the
+    first available block, and ensures that the file is not empty.
+
+    Args:
+        f (file object): The file object representing the file system.
+        filename (str): The name of the file to be saved.
+        content (str): The file content to be saved.
+
+    Raises:
+        NoFreeSpace: If no free space is available to store the file.
+        EmptyFile: If the content is empty.
+    """
+    if not content:
+        raise EmptyFile("Not allowed to store an empty file")
+
+    num_existing = _get_num_files(f)
+    
+    # Look for the first available slot in the file table
+    for new_fileno in range(MAX_FILES):
+        f.seek(HEADER_START + FILE_ENTRY_SIZE * (new_fileno + 1))
+        name_entry = f.read(FILE_ENTRY_SIZE).decode("ascii").strip('\0')
+        
+        if not name_entry:  # Empty entry found
+            break
+    else:
+        # If no empty block is found, raise NoFreeSpace
+        raise NoFreeSpace(f"No free space available, max files: {MAX_FILES}")
+
+    # Update the file count only if we're using a new slot
+    if new_fileno >= num_existing:
+        _set_num_files(f, num_existing + 1)
+
+    # Write filename to file table in the located free entry
+    f.seek(HEADER_START + FILE_ENTRY_SIZE * (new_fileno + 1))
+    f.write(filename.encode('ascii')[:FILE_ENTRY_SIZE])
+
+    # Write content to the file block, truncate if needed
+    f.seek(HEADER_START + FILE_BLOCK_SIZE * (new_fileno + 1))
+    f.write(content.encode('ascii')[:FILE_BLOCK_SIZE])