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61 lines (52 loc) · 1.78 KB
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# -*- coding: utf-8 -*-
# MinIO Python Library for Amazon S3 Compatible Cloud Storage, (C)
# 2019 MinIO, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
minio.select.helpers
~~~~~~~~~~~~~~~
This module implements the helper functions for SelectObject responses.
:copyright: (c) 2019 by MinIO, Inc.
:license: Apache 2.0, see LICENSE for more details.
"""
import codecs
from binascii import crc32
SQL = 'SQL' # Value for ExpressionType
EVENT_RECORDS = 'Records' # Event Type is Records
EVENT_PROGRESS = 'Progress' # Event Type Progress
EVENT_STATS = 'Stats' # Event Type Stats
EVENT_CONT = 'Cont' # Event Type continue
EVENT_END = 'End' # Event Type is End
EVENT_CONTENT_TYPE = "text/xml" # Event content xml type
EVENT = 'event' # Message Type is event
ERROR = 'error' # Message Type is error
def calculate_crc(value):
'''
Returns the CRC using crc32
'''
return crc32(value) & 0xffffffff
def validate_crc(current_value, expected_value):
'''
Validate through CRC check
'''
crc_current = calculate_crc(current_value)
crc_expected = byte_int(expected_value)
if crc_current == crc_expected:
return True
return False
def byte_int(data_bytes):
'''
Convert bytes to big-endian integer
'''
return int(codecs.encode(data_bytes, 'hex'), 16)