nx_pwg_rle.nx

nx_pwg_rle.nx -- the PackBits-like run-length codec shared by PWG-Raster AND URF (Apple Raster). This is the pixel-data encoding of "driverless" printing -- the bytes a real IPP printer rasterizes. Verified against the AUTHORITATIVE CUPS/PWG raster spec (sovereign-fetched, cited: knowledge/fetched/cups_raster_spec.raw, lines 483-501): - Each LINE begins with a 1-byte line-repeat count = (repeats - 1): 0x00 = appears once, 0xFF = 256x. - Within a line, whole pixels ("colors") are PackBits-encoded: control 0x00..0x7F -> REPEATED run: (ctrl+1) copies of the ONE following pixel (count 1..128) control 0x80..0xFF -> LITERAL run: (257-ctrl) following pixels verbatim (count 2..128) - one pixel = bpp bytes (sgray_8 -> 1 byte; sRGB -> 3 bytes). Cross-checked on the spec's worked example line 00 FE FFFF00 0000FF FFFF00 02 FFFFFF 00 00FF00 00 FFFFFF = yellow,blue,yellow, white,white,white, green, white (proves the decoder matches the spec). NEVER-BRICK (#26): pure byte arithmetic; NO syscalls, no hardware access. Sovereign (no imports). no_silent_failure: the decoder bounds-checks every read/write and returns -1 on truncation/overrun. genealogy_id: project-printer-management-ipp-sclass-2026-06-20 ; license_tier: ORIGINAL