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281 lines (222 loc) · 8.74 KB
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# This module is part of GitPython and is released under the
# 3-Clause BSD License: https://opensource.org/license/bsd-3-clause/
"""Functions that are supposed to be as fast as possible."""
__all__ = [
"tree_to_stream",
"tree_entries_from_data",
"traverse_trees_recursive",
"traverse_tree_recursive",
]
from stat import S_ISDIR
from git.compat import safe_decode, defenc
# typing ----------------------------------------------
from typing import (
Callable,
List,
MutableSequence,
Sequence,
Tuple,
TYPE_CHECKING,
Union,
overload,
)
if TYPE_CHECKING:
from _typeshed import ReadableBuffer
from git import GitCmdObjectDB
EntryTup = Tuple[bytes, int, str] # Same as TreeCacheTup in tree.py.
EntryTupOrNone = Union[EntryTup, None]
# ---------------------------------------------------
def tree_to_stream(entries: Sequence[EntryTup], write: Callable[["ReadableBuffer"], Union[int, None]]) -> None:
"""Write the given list of entries into a stream using its ``write`` method.
:param entries:
**Sorted** list of tuples with (binsha, mode, name).
:param write:
A ``write`` method which takes a data string.
"""
ord_zero = ord("0")
bit_mask = 7 # 3 bits set.
for binsha, mode, name in entries:
mode_str = b""
for i in range(6):
mode_str = bytes([((mode >> (i * 3)) & bit_mask) + ord_zero]) + mode_str
# END for each 8 octal value
# git slices away the first octal if it's zero.
if mode_str[0] == ord_zero:
mode_str = mode_str[1:]
# END save a byte
# Here it comes: If the name is actually unicode, the replacement below will not
# work as the binsha is not part of the ascii unicode encoding - hence we must
# convert to an UTF-8 string for it to work properly. According to my tests,
# this is exactly what git does, that is it just takes the input literally,
# which appears to be UTF-8 on linux.
if isinstance(name, str):
name_bytes = name.encode(defenc)
else:
name_bytes = name # type: ignore[unreachable] # check runtime types - is always str?
write(b"".join((mode_str, b" ", name_bytes, b"\0", binsha)))
# END for each item
def tree_entries_from_data(data: bytes) -> List[EntryTup]:
"""Read the binary representation of a tree and returns tuples of
:class:`~git.objects.tree.Tree` items.
:param data:
Data block with tree data (as bytes).
:return:
list(tuple(binsha, mode, tree_relative_path), ...)
"""
ord_zero = ord("0")
space_ord = ord(" ")
len_data = len(data)
i = 0
out = []
while i < len_data:
mode = 0
# Read Mode
# Some git versions truncate the leading 0, some don't.
# The type will be extracted from the mode later.
while data[i] != space_ord:
# Move existing mode integer up one level being 3 bits and add the actual
# ordinal value of the character.
mode = (mode << 3) + (data[i] - ord_zero)
i += 1
# END while reading mode
# Byte is space now, skip it.
i += 1
# Parse name, it is NULL separated.
ns = i
while data[i] != 0:
i += 1
# END while not reached NULL
# Default encoding for strings in git is UTF-8.
# Only use the respective unicode object if the byte stream was encoded.
name_bytes = data[ns:i]
name = safe_decode(bytes(name_bytes))
# Byte is NULL, get next 20.