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33f3066ddb
Commit 2902b78535 ("Fix XRecordRegisterClients() Integer underflow")
Assisted-by: Claude:claude-claude-opus-4-6
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2187>
82 lines
2.1 KiB
Python
82 lines
2.1 KiB
Python
# SPDX-License-Identifier: MIT
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#
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# RECORD extension protocol request builders
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import struct
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from dataclasses import dataclass, field
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# RECORD minor opcodes
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RecordQueryVersion = 0
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RecordCreateContext = 1
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RecordRegisterClients = 2
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RECORD_MAJOR = 1
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RECORD_MINOR = 13
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@dataclass
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class QueryVersionRequest:
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"""RecordQueryVersion request."""
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opcode: int
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major: int = RECORD_MAJOR
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minor: int = RECORD_MINOR
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def to_bytes(self, byte_order: str = "<") -> bytes:
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return struct.pack(
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f"{byte_order}BBHHH",
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self.opcode,
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RecordQueryVersion,
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2,
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self.major,
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self.minor,
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)
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@dataclass
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class CreateContextRequest:
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"""RecordCreateContext request.
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Header is 20 bytes, followed by nClients CARD32 client IDs,
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then nRanges xRecordRange structs (32 bytes each).
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"""
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opcode: int
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context_id: int
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element_header: int = 0
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client_ids: list[int] = field(default_factory=list)
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ranges_data: bytes = b""
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n_clients_override: int | None = None
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n_ranges_override: int | None = None
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def to_bytes(self, byte_order: str = "<") -> bytes:
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n_clients = (
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self.n_clients_override
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if self.n_clients_override is not None
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else len(self.client_ids)
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)
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n_ranges = (
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self.n_ranges_override
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if self.n_ranges_override is not None
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else len(self.ranges_data) // 32
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)
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client_data = b""
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for cid in self.client_ids:
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client_data += struct.pack(f"{byte_order}I", cid)
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total_bytes = 20 + len(client_data) + len(self.ranges_data)
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pad_len = (4 - total_bytes % 4) % 4
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total_bytes += pad_len
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header = struct.pack(
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f"{byte_order}BBH I B xxx I I",
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self.opcode,
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RecordCreateContext,
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total_bytes // 4,
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self.context_id,
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self.element_header,
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n_clients,
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n_ranges,
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)
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return header + client_data + self.ranges_data + b"\x00" * pad_len
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