test(fuzz): seed multiplex frame header corpus (FCV-19.a)#4756
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Seed the libfuzzer corpus for multiplex_frame_parse so coverage-guided runs start from meaningful boundary conditions instead of empty input. Covers all 18 MSG_* tags from envelope::MessageCode, payload-length boundaries (0, 1, MAX-1, MAX), truncated headers (1/2/3 bytes), an oversized declared length with a too-short payload, invalid and unknown tag bytes (below MPLEX_BASE, gaps in the code range, 0xFF), and a valid-header-plus-trailing-garbage case so the streaming walker is exercised across frame boundaries.
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Summary
multiplex_frame_parsetarget so coverage-guided runs start from meaningful boundary conditions instead of empty input.MSG_*tags fromenvelope::MessageCode, length boundaries (0, 1,MAX_PAYLOAD_LENGTH - 1,MAX_PAYLOAD_LENGTH), truncated headers (1/2/3 bytes), oversized declared length with too-short payload, invalid tags (belowMPLEX_BASE, gaps in the code range,0xFF), and a valid header followed by trailing garbage so the streaming walker is exercised across frame boundaries.tag = MPLEX_BASE(7) + code, with the 4-byte little-endian header(tag << 24) | (payload_len & 0x00FF_FFFF)as enforced byMessageHeader::from_raw.Test plan
cargo +nightly fuzz run multiplex_frame_parsepicks up the new corpus and reports the 39 seeds on startup.