| # -*- 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 | |
| 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 | |
| ''' | |
| return calculate_crc(current_value) == byte_int(expected_value) | |
| def byte_int(data_bytes): | |
| ''' | |
| Convert bytes to big-endian integer | |
| ''' | |
| return int(codecs.encode(data_bytes, 'hex'), 16) | |