Critical Bug Fixed:
Files between 512 and 1024 bytes (e.g., small images) were incorrectly
handled. The condition `header.len() > 512` would skip the first 512
bytes even for small files, using only a tiny portion for pk calculation.
Example Bug:
- PNG image of 700 bytes
- header.len() = 700
- 700 > 512 = TRUE
- Used &header[512..] = only 188 bytes (octets 512-700)
- SKIPPED important PNG header and image data!
Solution:
Changed condition from `> 512` to `>= 1024`:
- Files < 1024 bytes → use ALL content (correct for images)
- Files >= 1024 bytes → skip first 512 bytes (correct for FLAC)
Impact:
- pmocovers cache now works correctly with small images
- No more data loss for files between 512-1024 bytes
- FLAC behavior unchanged (still skips header correctly)
b0c08c3c8c