LC

Implement FAT12 Filesystem Reader: Parse Boot Sector and FAT

hard5/10

Implement Write-Ahead Logging for Filesystem Journaling Implement FAT12 Filesystem Writer: Create Files and Update FAT

Language

Compiler

2.0s Limit 256MB

Implementation

Implement FAT12 reader.

Requirements:

Open disk image file (floppy image)
Parse boot sector (bytes per sector, sectors per FAT, etc.)
Read and parse FAT table
Read root directory entries
Find file by name
Follow FAT chain to read file data
Print file listing
Demonstrate reading file contents

Test:

Parse boot sector
List root directory files
Read specific file contents
Follow FAT chain correctly

Why This Matters

FAT12 is the exact filesystem GRUB's stage-1 bootloader and real 1.44MB floppy images use, and its FAT-chain design is the direct ancestor of the FAT32 still mandated for every UEFI system partition today. Get the 12-bit packing math wrong (two entries jammed into three bytes) and you silently follow a corrupted cluster chain into someone else's file data.

Hints

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Validation Suite

main.c

Workspace 1.0