MNI-4: Nikon MakerNote Parser #13

Summary

Implement Nikon MakerNote parser for Epic #9 (Phase 2).

Format Specification - 3 VARIANTS

Type 1 (E990, D1)

• Header: "Nikon" + 0x00 0x01 0x00 (8 bytes)
• IFD Offset: +8
• Byte Order: Inherits from parent
• Offset Base: Absolute

Type 3 (D70, D100, D200+) - Most Common

• Header: "Nikon" + 0x00 0x02 0x00 + embedded TIFF header (18 bytes)
• IFD Offset: +18
• Byte Order: Embedded (check bytes 10-11 for II/MM)
• Offset Base: Relative to MakerNote start

Type 2 (E700-E950) - Legacy

• Header: None
• Uses Type 3 tag definitions
• Absolute offsets

Priority Tags (Phase 2)

Encrypted Fields (skip initially)

• 0x0098: LensData - encrypted with serial-based key
• 0x00A8: FlashInfo - partially encrypted

Acceptance Criteria

• Detects all 3 Nikon variants
• Handles embedded byte order (Type 3)
• Decodes 15+ Nikon tags
• Gracefully skips encrypted fields
• Unit tests with real Nikon samples (NEF, JPG)

Blocked by: MNI-2 (Canon)
Parent: #9