smmap_sliding_window_map_manager_cursor_file_reading.py

1import os
2from smmap import SlidingWindowMapManager
3
4# Create a dummy file to read from
5file_path = "example_data.bin"
6with open(file_path, "wb") as f:
7    f.write(b"Hello World" * 1024)
8
9# Initialize the sliding window map manager
10man = SlidingWindowMapManager()
11
12# Create a cursor to a specific file and offset
13# A cursor provides a window into the file's memory map
14cursor = man.make_cursor(file_path)
15
16# You can now use the cursor to access the data. 
17# It handles the mapping and unmapping of file windows automatically.
18assert cursor.is_valid()
19print(f"File size via cursor: {cursor.file_size()}")
20
21# Read a chunk of data (e.g., 11 bytes)
22data = cursor.buffer()[0:11]
23print(f"Data read: {data}")
24
25# Clean up
26cursor.unuse()
27if os.path.exists(file_path):
28    os.remove(file_path)