nx_urf.nx

nx_urf.nx -- sovereign URF (Apple Raster / UNIRAST) document encoder. Wraps the shared PWG RLE in the URF container the Brother (and every AirPrint printer) accepts (document-format image/urf). URF layout (reverse-engineered + cross-checked; the Brother advertises urf-supported=W8 = 8-bit gray): FILE HEADER (12 bytes): "UNIRAST\0" (8) + uint32 BE page-count. PER-PAGE HEADER (32 bytes): [0] bitsPerPixel (8 for sgray_8) [1] colorspace (sGray=0,sRGB=1) [2] duplex (0/1/2) [3] quality (0 def,3 draft,4 normal,5 high) [4] mediaType (0 auto) [5] mediaPosition (0 auto) [6..11] reserved(0) [12..15] width BE [16..19] height BE [20..23] dpi BE [24..31] reserved(0) PAGE DATA: PWG/URF PackBits RLE (nx_pwg_rle), pixels top-to-bottom, left-to-right. HONEST NOTE: the RLE is spec-PROVEN (CUPS spec worked example); the URF header is spec-GROUNDED (reverse-engineered) -- the real printer is the final oracle (live submit = the next rung). NEVER-BRICK (#26): pure builder; no syscalls. Sovereign (imports only nx_pwg_rle.nx). genealogy_id: project-printer-management-ipp-sclass-2026-06-20 ; license_tier: ORIGINAL