A self-contained, portable FAT12/16/32 filesystem library with pluggable disk I/O callbacks. Used across Ventoy2Disk, Plugson, vtoycli, and vtoyjump. Demonstrates clean abstraction of disk access and supports long filenames, timestamps, and formatting. Could be extracted for any project needing FAT filesystem access without OS dependencies.

A minimal, standalone XZ decompressor (LZMA2) derived from the Linux kernel's xz-embedded. Used in multiple Ventoy components for decompressing kernel images and initramfs. Demonstrates careful memory management and stream handling. Reusable in any embedded or bootloader context requiring XZ decompression without external dependencies.

A custom JSON builder and parser implemented in C with a macro-based API. Used by Ventoy's plugin system and configuration handling. Demonstrates non-obvious skill in writing a compact, memory-efficient JSON implementation suitable for bootloader environments where standard libraries are unavailable. Could be reused in any resource-constrained system.

A UEFI application that creates a virtual disk from a Ventoy image map, hooks EFI runtime services (GetVariable, ExitBootServices) to bypass Secure Boot and fix memory maps, then loads and boots the target OS. Demonstrates deep understanding of UEFI internals, protocol wrapping, and virtual block device creation. Reusable as a reference for any UEFI-based virtual disk or boot shim.

A shell library used in initramfs hooks to detect the Ventoy disk, load device-mapper modules, create udev rules, and set up the virtual block device. Demonstrates a robust pattern for injecting custom logic into Linux initramfs across many distributions. The parameterized design and fallback mechanisms make it adaptable to other boot-time disk virtualization scenarios.