nx_jpeg_decode_test.nx

nx_jpeg_decode_test.nx -- KAT for top-level baseline-JPEG decoder. Constructs a minimal grayscale 8x8 JPEG byte-by-byte (137 bytes) then decodes it end-to-end via nx_jpeg_decode. Verifies the output plane is all 128 (zero-coefficient block + level shift). JPEG byte layout: FF D8 SOI FF DB 00 43 00 + 64x01 DQT (Pq=0 Tq=0, all-ones identity quant) FF C4 00 26 DHT (DC + AC stacked, 36-byte payload) 00 01 00...00 00 DC: tc=0 th=0, BITS={1,0...0}, HUFFVAL={0} 10 01 00...00 00 AC: tc=1 th=0, BITS={1,0...0}, HUFFVAL={0} FF C0 00 0B SOF0 (1 comp, 8x8) 08 00 08 00 08 01 01 11 00 FF DA 00 08 SOS (1 comp) 01 01 00 00 3F 00 00 entropy: DC cat 0 + AC EOB FF D9 EOI expect_exit: 0 license_tier: ORIGINAL