Tools: Libbbf: Bound Book Format, A High-performance Container For Comics...

Bound Book Format: A high-performance, DirectStorage-native container format for comics and manga

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Bound Book Format (.bbf) is a high-performance binary container designed specifically for digital comic books and manga. Unlike CBR/CBZ, BBF is built for DirectSotrage/mmap, easy integrity checks, and mixed-codec containerization.

Alternatively, if you need python support, use libbbf-python.

BBF is designed as a Footer-indexed binary format. This allows for rapid append-only creation and immediate random access to any page without scanning the entire file.

The bbfmux reference implementation utilizes Memory Mapping (mmap/MapViewOfFile). Instead of reading file data into intermediate buffers, the tool maps the container directly into the process address space. This allows the CPU to access image data at the speed of your NVMe drive's hardware limit.

Integrity checks utilize Parallel XXH3. On multi-core systems, the verifier splits the asset table into chunks and validates multiple pages simultaneously. This makes BBF verification up to 10x faster than ZIP/RAR CRC checks.

Every asset in a BBF file starts on a 4096-byte boundary. This alignment is critical for modern hardware, allowing for DirectStorage transfers directly from disk to GPU memory, bypassing CPU bottlenecks entirely.

Note: DirectStorage isn't avaliable for images yet (as far as I know), but I've made sure to accomodate such a thing in the future with this format.

NOTE: libbbf.h includes a flags field, as well as extra padding for each asset entry. This is so that in the future libbbf can accomodate future technical advancements in both readers and image storage. I.E. If images support DirectStorage in the future, then BBF will be able to use it.

Source: HackerNews