Introduction

Documentation of the reverse-engineered .dem file format used in SourceEngine games.

Caveats

• All names are written in PascalCase for consistency and do not match the original name defined in the engine
• Names might be slightly altered (UserCmdInfo = CUserCmd) or made up (Slot)
• The term old engine refers to engines with DemoProtocol 2 or 3
• The term new engine refers to engines with DemoProtocol 4
• All strings without a known size are null-terminated
• All strings are in ASCII format unless explicitly denoted
• Sequence order of bytes are stored in little endian (LE)

Changelog

2023-09-28

• Improved examples section for libraries and showcases

2023-09-27

• Migrated docs to Docusaurus
• Switched to new domain
• Updated examples (766132d)
• Fixed typos and small issues (c57f037)

2021-03-14

• Migrated docs to mdbook
• Fixed order of ForwardMove and SideMove in UserCmdInfo
• Added some additional caveats
• Added short descriptions
• Added pseudocode examples for decoding complex data structures
• Added license, dependencies, features and applications to examples
• Added changelog
• Added docs for Net/Svc messages