mirror of
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66 lines
2.1 KiB
Python
66 lines
2.1 KiB
Python
# Copyright (c) Meta Platforms, Inc. and affiliates.
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# SPDX-License-Identifier: GPL-3.0-or-later
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from collections import namedtuple
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def _append_uleb128(buf, value):
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while True:
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byte = value & 0x7F
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value >>= 7
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if value:
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buf.append(byte | 0x80)
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else:
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buf.append(byte)
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break
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def _append_sleb128(buf, value):
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while True:
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byte = value & 0x7F
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value >>= 7
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if (not value and not (byte & 0x40)) or (value == -1 and (byte & 0x40)):
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buf.append(byte)
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break
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else:
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buf.append(byte | 0x80)
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U8 = namedtuple("U8", ["value"])
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U8._append = lambda self, buf, byteorder: buf.append(self.value)
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S8 = namedtuple("S8", ["value"])
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S8._append = lambda self, buf, byteorder: buf.append(self.value & 0xFF)
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U16 = namedtuple("U16", ["value"])
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U16._append = lambda self, buf, byteorder: buf.extend(self.value.to_bytes(2, byteorder))
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S16 = namedtuple("S16", ["value"])
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S16._append = lambda self, buf, byteorder: buf.extend(
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self.value.to_bytes(2, byteorder, signed=True)
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)
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U32 = namedtuple("U32", ["value"])
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U32._append = lambda self, buf, byteorder: buf.extend(self.value.to_bytes(4, byteorder))
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S32 = namedtuple("S32", ["value"])
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S32._append = lambda self, buf, byteorder: buf.extend(
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self.value.to_bytes(4, byteorder, signed=True)
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)
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U64 = namedtuple("U64", ["value"])
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U64._append = lambda self, buf, byteorder: buf.extend(self.value.to_bytes(8, byteorder))
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S64 = namedtuple("S64", ["value"])
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S64._append = lambda self, buf, byteorder: buf.extend(
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self.value.to_bytes(8, byteorder, signed=True)
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)
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ULEB128 = namedtuple("ULEB128", ["value"])
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ULEB128._append = lambda self, buf, byteorder: _append_uleb128(buf, self.value)
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SLEB128 = namedtuple("SLEB128", ["value"])
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SLEB128._append = lambda self, buf, byteorder: _append_sleb128(buf, self.value)
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def assemble(*args, little_endian=True):
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byteorder = "little" if little_endian else "big"
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buf = bytearray()
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for arg in args:
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if isinstance(arg, bytes):
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buf.extend(arg)
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else:
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arg._append(buf, byteorder)
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return buf
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