msime-windows/engine/contracts

Product contracts

These headers are independently consumable C++17 contracts. Including them does not link the input engine, start threads, access dictionaries, or require any third-party code. The TSF text service consumes only these headers; the server consumes the same source by linking the engine. Both live in this repository — windows/ and server/ — and so does the engine, so one commit covers all three and there is no pin to keep in step.

windows_ipc.h owns the wire layouts, pipe names and opcodes. voice_composition_pipe.h owns voice framing. Consumers may wrap these headers but must not duplicate their definitions.

punctuation/policy.json is the source of truth for the ASCII punctuation keys and their Chinese translations. Its generated policy.h is consumed by the engine and included directly by the hosts that route punctuation keys. Stateful quote alternation and nested book-title marks remain part of the same contract, rather than being re-created in each host.

product_lock.py contains the shared product-lock primitives used by the three platform locks. See product_lock.md for the vendoring and byte-equality rule.

Main handshake

Reverse endpoints retain their 16-byte hello and PipeReady acknowledgement. Once both endpoints are registered, the new client sends the existing 304-byte ClientHello with:

Field	Meaning
keycode	MSIP magic
wch	Major wire protocol version
point[0]	Minor additive version
modifiers_down	Supported capability bits
point[1]	Required capability bits
request_id	Nonzero registration correlation ID

The Server sends ProtocolReady or ProtocolMismatch on the registered reply endpoint before activating the main route. The reply echoes the correlation ID and contains major/minor, negotiated capabilities and magic in the first six UTF-16 units. These packets are consumed only during registration and are never text commits.

Existing DLLs with unversioned hello remain accepted by the new Server using the established v1 semantics; they receive no new opcode. New DLLs require an acknowledgement from the new Server within the existing bounded handshake budget. Against an old or incompatible Server they remain disconnected and use the existing raw-input fallback, rather than interpreting unnegotiated frames. A late acknowledgement from an old registration cannot authorize another one.

Append opcodes; never change released values or reuse them. An incompatible layout needs a new major protocol and an explicit migration, not another copy of a header. Minor additions must be optional capabilities.

CharacterSetShortcut is optional and is not included in the default capability set. Windows implementations that support it pass Capabilities | CharacterSetShortcut to Hello / Negotiate. Only after negotiating this bit may a Chinese-mode client consume Ctrl+Shift+F (no Alt or Windows modifier) and send the existing KeyEvent with keycode F and Shift/Control modifier bits. The server toggles the persisted character set without clearing composition, and refreshes the current candidate page and toolbar. It sends no key reply. Clients suppress auto-repeat and must not replay an ambiguously delivered toggle; older peers simply omit the optional bit.

tests/windows_ipc_contract.cpp executes wire-layout/upgrade/framing cases on all Engine CI platforms and both Windows TSF architectures.

backend/protocol.json 定义 MSIME-Backend 的可选共通 HTTP 服务 API，详见后端协议与兼容性。