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7d89596e6c
Commit541ab2ecd4("Xi/randr: fix handling of PropModeAppend/Prepend") Commit14f480010a("randr: avoid integer truncation in length check of ProcRRChange*Property") Assisted-by: Claude:claude-claude-opus-4-6 Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2187>
134 lines
3 KiB
Python
134 lines
3 KiB
Python
# SPDX-License-Identifier: MIT
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#
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# RandR extension protocol request builders
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import struct
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from dataclasses import dataclass
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# RandR minor opcodes
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RRQueryVersion = 0
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RRGetScreenResources = 8
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RRChangeOutputProperty = 13
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RRGetOutputProperty = 15
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RRGetScreenResourcesCurrent = 25
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RR_MAJOR = 1
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RR_MINOR = 6
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# Property modes (same as core X11)
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PropModeReplace = 0
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PropModePrepend = 1
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PropModeAppend = 2
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@dataclass
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class QueryVersionRequest:
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"""RRQueryVersion request."""
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opcode: int
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major: int = RR_MAJOR
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minor: int = RR_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}BBHII",
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self.opcode,
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RRQueryVersion,
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3,
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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 GetScreenResourcesCurrentRequest:
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"""RRGetScreenResourcesCurrent request."""
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opcode: int
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window: int
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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}BBHI",
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self.opcode,
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RRGetScreenResourcesCurrent,
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2,
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self.window,
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)
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@dataclass
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class ChangeOutputPropertyRequest:
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"""RRChangeOutputProperty request."""
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opcode: int
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output: int
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property_atom: int
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type_atom: int
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format: int = 32
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mode: int = PropModeReplace
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data: bytes = b""
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num_items: int | None = None
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length_override: int | None = None
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def to_bytes(self, byte_order: str = "<") -> bytes:
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num_items = (
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self.num_items
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if self.num_items is not None
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else (len(self.data) // (self.format // 8) if self.data else 0)
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)
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total_bytes = 24 + len(self.data)
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pad_len = (4 - total_bytes % 4) % 4
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total_bytes += pad_len
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length = (
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self.length_override
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if self.length_override is not None
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else total_bytes // 4
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)
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header = struct.pack(
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f"{byte_order}BBH III BB H I",
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self.opcode,
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RRChangeOutputProperty,
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length,
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self.output,
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self.property_atom,
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self.type_atom,
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self.format,
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self.mode,
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0, # pad
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num_items,
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)
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return header + self.data + b"\x00" * pad_len
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@dataclass
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class GetOutputPropertyRequest:
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"""RRGetOutputProperty request."""
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opcode: int
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output: int
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property_atom: int
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type_atom: int = 0 # AnyPropertyType
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offset: int = 0
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length: int = 0xFFFF
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delete: bool = False
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pending: bool = True
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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}BBH I II II BB H",
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self.opcode,
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RRGetOutputProperty,
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7, # 28 bytes = 7 words
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self.output,
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self.property_atom,
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self.type_atom,
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self.offset,
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self.length,
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1 if self.delete else 0,
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1 if self.pending else 0,
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0, # pad
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)
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