Mercurial revlog payload map

How it works

Parse 64-byte records and inline payload framing. Separate revision parents from delta predecessors: ordinary deltas use the previous revision, while generaldelta uses the recorded base. Follow the selected chain to its snapshot.

Revision 2 has revision parent 0 but stored delta predecessor 1. Its ordinary chain is 0,1,2 and requires 4+3+2 = 9 compressed bytes.

Limits

Plain revlog v1 only, up to 8 MiB per input and 10000 revisions. Unknown feature/revision flags, forward bases, inconsistent inline offsets and malformed framing reject. External ranges are declared-only unless matching .d bytes are supplied. Node IDs/payloads remain opaque: no decompression, content/hash verification, repair, repository-health or I/O-cost claim.

• Mercurial v1 format notes ↗
• Mercurial fixed-layout parser ↗
• Mercurial delta-parent implementation ↗