encodeCFile emitted the cfile payload as bare zlib. Fossil's on-disk cfile format, produced by blob_compress() in src/blob.c, is a 4-byte big-endian uncompressed-size prefix followed by the zlib stream, and fossil's receiver (content_put_ex) stores the wire payload verbatim into blob.content, later reading it back through blob_uncompress(), which reads that prefix to size its output before inflating. Without the prefix a real fossil client that clones from us stores every full (non-delta) artifact unreadable: fossil clone exits 0 but rebuild lands zero check-ins and manifests decode to garbage.

Prepend the 4-byte prefix in encodeCFile and count it in CSIZE, so the payload matches blob_compress byte-for-byte. The prefix value is len(Content) (the bytes being compressed -- a delta payload for delta cards), which stays distinct from the USIZE header field (the full reconstructed size). Our internal storage already used fossil's framing (blob.Compress), and the decoder already accepted both framings and rebuilt StoredBlob, so this is a wire-encode-only fix; receive and on-disk paths are unchanged.

TestCloneRealFossilWithDeltaChain now asserts six materialized check-ins instead of skipping against this issue, and a new TestCloneRealFossilFullContent drives a delta-free corpus through a real fossil clone+rebuild, asserting the check-in count and that a cloned manifest decodes to parseable manifest cards. check-in: 00e69bc9e0 user: [email protected] tags: trunk