[TheWillard]

The mipmap size in a PAA has 24 bits. An uncompressed 4096x4096 DXT5 mipmap is 2^24 bytes and stores 0, so its data was read as the next mipmap header. Found in two terrain textures of the @rhspkl mod (rhspkl_art.pbo: blud_elvebunn_nopx.paa, blud_elvebunn_malingsvei_nohq.paa), one of which panicked before #47.

Uncompressed DXT1 and DXT5 blocks always fill the mipmap, so their size now follows from the dimensions when it matches the stored size mod 2^24. Only mipmaps of 2^24 bytes or more change.

• Both textures load all 11 mipmaps, at the positions listed in their OFFS tag.
• Arma 3's 20,817 textures read the same as before.
• Test: a synthetic DXT5 texture with an uncompressed 4096x4096 mipmap (fails without the fix).

Based on #47 for its DXT block size.

[codecov]

Codecov Report

❌ Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...rma-file-formats/src/real_virtuality/paa/mipmap.rs	95.65%	1 Missing ⚠️

Files with missing lines	Coverage Δ
arma-file-formats/src/real_virtuality/paa/paa.rs	97.60% <100.00%> (ø)
...rma-file-formats/src/real_virtuality/paa/mipmap.rs	88.31% <95.65%> (+1.38%)	⬆️

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