##// END OF EJS Templates
qdiff: migrate to modern pager API...
qdiff: migrate to modern pager API This results in the default pager-attend list being empty. Sadly, we can't let the code be that way, because some legacy extensions depend on hooking the pager's attend list at import time (and we'd like to not break them), and if the list is actually *empty* that triggers magic behavior in the extension that attends everything. Instead, we put a long, improbable command name as the only entry in the attend list.

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r30656:16f4b341 default
r31033:861b070d default
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load.py
107 lines | 3.7 KiB | text/x-python | PythonLexer
Zack Hricz
fsmonitor: refresh pywatchman to upstream...
r30656 # Copyright 2016 Facebook, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# * Neither the name Facebook nor the names of its contributors may be used to
# endorse or promote products derived from this software without specific
# prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
# no unicode literals
try:
from . import bser
except ImportError:
from . import pybser as bser
import ctypes
EMPTY_HEADER = b"\x00\x01\x05\x00\x00\x00\x00"
def _read_bytes(fp, buf):
"""Read bytes from a file-like object
@param fp: File-like object that implements read(int)
@type fp: file
@param buf: Buffer to read into
@type buf: bytes
@return: buf
"""
# Do the first read without resizing the input buffer
offset = 0
remaining = len(buf)
while remaining > 0:
l = fp.readinto((ctypes.c_char * remaining).from_buffer(buf, offset))
if l is None or l == 0:
return offset
offset += l
remaining -= l
return offset
def load(fp, mutable=True, value_encoding=None, value_errors=None):
"""Deserialize a BSER-encoded blob.
@param fp: The file-object to deserialize.
@type file:
@param mutable: Whether to return mutable results.
@type mutable: bool
@param value_encoding: Optional codec to use to decode values. If
unspecified or None, return values as bytestrings.
@type value_encoding: str
@param value_errors: Optional error handler for codec. 'strict' by default.
The other most common argument is 'surrogateescape' on
Python 3. If value_encoding is None, this is ignored.
@type value_errors: str
"""
buf = ctypes.create_string_buffer(8192)
SNIFF_BUFFER_SIZE = len(EMPTY_HEADER)
header = (ctypes.c_char * SNIFF_BUFFER_SIZE).from_buffer(buf)
read_len = _read_bytes(fp, header)
if read_len < len(header):
return None
total_len = bser.pdu_len(buf)
if total_len > len(buf):
ctypes.resize(buf, total_len)
body = (ctypes.c_char * (total_len - len(header))).from_buffer(
buf, len(header))
read_len = _read_bytes(fp, body)
if read_len < len(body):
raise RuntimeError('bser data ended early')
return bser.loads(
(ctypes.c_char * total_len).from_buffer(buf, 0),
mutable,
value_encoding,
value_errors)