# Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
#
# 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.
import base64
[docs]def bytes_to_b64str(data_bytes) -> str:
"""Convert binary to base64-encoded string."""
encoded_bytes = base64.b64encode(data_bytes)
return encoded_bytes.decode("ascii")
[docs]def b64str_to_bytes(b64str: str) -> bytes:
"""Convert base64-encoded string to binary."""
encoded_bytes = b64str.encode("ascii")
return base64.b64decode(encoded_bytes)
[docs]def binary_file_to_b64str(file_name) -> str:
"""Encode content of a binary file to a Base64-encoded ASCII string.
Args:
file_name: the binary file to be processed
Returns: base64-encoded ASCII string
"""
data_bytes = open(file_name, "rb").read()
return bytes_to_b64str(data_bytes)
[docs]def b64str_to_binary_file(b64str: str, file_name):
"""Decode a base64-encoded string and write it into a binary file.
Args:
b64str: the base64-encoded ASCII string
file_name: the file to write to
Returns: number of bytes written
"""
data_bytes = b64str_to_bytes(b64str)
with open(file_name, "wb") as f:
f.write(data_bytes)
return len(data_bytes)
[docs]def text_file_to_b64str(file_name) -> str:
"""Encode content of a text file to a Base64-encoded ASCII string.
Args:
file_name: name of the text file
Returns: base64-encoded string
"""
data_string = open(file_name, "r").read()
data_bytes = data_string.encode("utf-8")
return bytes_to_b64str(data_bytes)
[docs]def b64str_to_text_file(b64str: str, file_name):
"""Decode a base64-encoded string and write result into a text file.
Args:
b64str: base64-encoded string
file_name: file to be created
Returns: number of data types written (may not be the same as number of characters)
"""
data_bytes = b64str_to_bytes(b64str)
data_string = data_bytes.decode("utf-8")
with open(file_name, "w") as f:
f.write(data_string)
return len(data_bytes)