自己实现编码解码base64文件Python
Own implement encoding and decoding base64 files in Python
我自己的 base64 编码实现有问题。我已经获得了下面的代码。我想它只适用于带有英文字母的文本文件。比如pdf文件是编解码的，就是区别单个字符。
def base64Encode(data):
alphabet = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","0","1","2","3","4","5","6","7","8","9","+","/"]
bit_str = ""
base64_str = ""
for char in data:
bin_char = bin(char).lstrip("0b")
bin_char = bin_char.zfill(8)
bit_str += bin_char
brackets = [bit_str[x:x+6] for x in range(0,len(bit_str),6)]
for bracket in brackets:
if(len(bracket) < 6):
bracket = bracket + (6-len(bracket))*"0"
base64_str += alphabet[int(bracket,2)]
# print(brackets[-4:])
#if(bracket[-1:)
#print(len(base64_str))
#if(len(base64_str) != 76):
# base64_str += "="
return base64_str
def base64Decode(text):
alphabet = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","0","1","2","3","4","5","6","7","8","9","+","/"]
bit_str = ""
text_str = ""
for char in text:
if char in alphabet:
bin_char = bin(alphabet.index(char)).lstrip("0b")
bin_char = bin_char.zfill(6)
bit_str += bin_char
brackets = [bit_str[x:x+8] for x in range(0,len(bit_str),8)]
for bracket in brackets:
text_str += chr(int(bracket,2))
return text_str.encode("UTF-8")
w = open("encode.txt", "w")
with open("bla.txt", "rb") as f:
byte = f.read(57)
while byte:
w.write(base64Encode(byte))
w.write("\n")
byte = f.read(57)
w.close()
f.close()
w = open("decode.txt", "wb")
with open("encode.txt", "r") as f:
byte = f.read(77)
while byte:
w.write(base64Decode(byte))
byte = f.read(77)
w.close()
f.close()
在我看来，这一行 "return text_str.encode (" UTF-8 ")" 应该没有解码为 UTF-8。但是，如果只保留 "return text_str"，则会出现错误：TypeError: 'str' does not support the buffer interface.
bla.txt:
Phil Mercer reports on Cyclone Pam which has ravaged the Pacific nation of Vanuatu. Video courtesy of YouTube/Isso Nihmei at 350.org
Save the Children's Vanuatu country director Tom Skirrow said on Saturday: "The scene here this morning is complete devastation - houses are destroyed, trees are down, roads are blocked and people are wandering the streets looking for help.
ĄŚĆŹŻÓ
encode.txt
UGhpbCBNZXJjZXIgcmVwb3J0cyBvbiBDeWNsb25lIFBhbSB3aGljaCBoYXMgcmF2YWdlZCB0aGUg
UGFjaWZpYyBuYXRpb24gb2YgVmFudWF0dS4gVmlkZW8gY291cnRlc3kgb2YgWW91VHViZS9Jc3Nv
IE5paG1laSBhdCAzNTAub3JnDQoNClNhdmUgdGhlIENoaWxkcmVuJ3MgVmFudWF0dSBjb3VudHJ5
IGRpcmVjdG9yIFRvbSBTa2lycm93IHNhaWQgb24gU2F0dXJkYXk6ICJUaGUgc2NlbmUgaGVyZSB0
aGlzIG1vcm5pbmcgaXMgY29tcGxldGUgZGV2YXN0YXRpb24gLSBob3VzZXMgYXJlIGRlc3Ryb3ll
ZCwgdHJlZXMgYXJlIGRvd24sIHJvYWRzIGFyZSBibG9ja2VkIGFuZCBwZW9wbGUgYXJlIHdhbmRl
cmluZyB0aGUgc3RyZWV0cyBsb29raW5nIGZvciBoZWxwLg0KDQrEhMWaxIbFucW7w5M
decode.txt
Phil Mercer reports on Cyclone Pam which has ravaged the Pacific nation of Vanuatu. Video courtesy of YouTube/Isso Nihmei at 350.org
Save the Children's Vanuatu country director Tom Skirrow said on Saturday: "The scene here this morning is complete devastation - houses are destroyed, trees are down, roads are blocked and people are wandering the streets looking for help.
ÄÅÄŹŻÃ
页面编码的相同文本：http://www.motobit.com/util/base64-decoder-encoder.asp
UGhpbCBNZXJjZXIgcmVwb3J0cyBvbiBDeWNsb25lIFBhbSB3aGljaCBoYXMgcmF2YWdlZCB0aGUg
UGFjaWZpYyBuYXRpb24gb2YgVmFudWF0dS4gVmlkZW8gY291cnRlc3kgb2YgWW91VHViZS9Jc3Nv
IE5paG1laSBhdCAzNTAub3JnDQoNClNhdmUgdGhlIENoaWxkcmVuJ3MgVmFudWF0dSBjb3VudHJ5
IGRpcmVjdG9yIFRvbSBTa2lycm93IHNhaWQgb24gU2F0dXJkYXk6ICJUaGUgc2NlbmUgaGVyZSB0
aGlzIG1vcm5pbmcgaXMgY29tcGxldGUgZGV2YXN0YXRpb24gLSBob3VzZXMgYXJlIGRlc3Ryb3ll
ZCwgdHJlZXMgYXJlIGRvd24sIHJvYWRzIGFyZSBibG9ja2VkIGFuZCBwZW9wbGUgYXJlIHdhbmRl
cmluZyB0aGUgc3RyZWV0cyBsb29raW5nIGZvciBoZWxwLg0KDQrEhMWaxIbFucW7w5M=
除“=”外同理，因文件开头错误而省略
以及 pdf 格式的示例原始文件：
%PDF-1.5
%µµµµ
1 0 obj
<</Type/Catalog/Pages 2 0 R/Lang(pl-PL) /StructTreeRoot 8 0 R/MarkInfo<</Marked true>>>>
endobj
2 0 obj
<</Type/Pages/Count 1/Kids[ 3 0 R] >>
endobj
3 0 obj
<</Type/Page/Parent 2 0 R/Resources<</Font<</F1 5 0 R>>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<</Type/Group/S/Transparency/CS/DeviceRGB>>/Tabs/S/StructParents 0>>
endobj
4 0 obj
<</Filter/FlateDecode/Length 110>>
stream
xœUÌ
€@ྰï0QËÝ®Èiž?(†kb°hòý«ZD˜4ßÀΨ*;…¡xº ¨#“íªFrÄI!w…˜2ËQ81®D<™ÇS=Ó’léŠ82µ·>^åŒÊO- >[´SÀ
endstream
endobj
5 0 obj
<</Type/Font/Subtype/TrueType/Name/F1/BaseFont/ABCDEE+Calibri/Encoding/WinAnsiEncoding/FontDescriptor 6 0 R/FirstChar 32/LastChar 97/Widths 15 0 R>>
endobj
6 0 obj
<</Type/FontDescriptor/FontName/ABCDEE+Calibri/Flags 32/ItalicAngle 0/Ascent 750/Descent -250/CapHeight 750/AvgWidth 521/MaxWidth 1743/FontWeight 400/XHeight 250/StemV 52/FontBBox[ -503 -250 1240 750] /FontFile2 16 0 R>>
endobj
7 0 obj
执行脚本后：
%PDF-1.5
%µµµµ
1 0 obj
<</Type/Catalog/Pages 2 0 R/Lang(pl-PL) /StructTreeRoot 8 0 R/MarkInfo<</Marked true>>>>
endobj
2 0 obj
<</Type/Pages/Count 1/Kids[ 3 0 R] >>
endobj
3 0 obj
<</Type/Page/Parent 2 0 R/Resources<</Font<</F1 5 0 R>>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<</Type/Group/S/Transparency/CS/DeviceRGB>>/Tabs/S/StructParents 0>>
endobj
4 0 obj
<</Filter/FlateDecode/Length 110>>
stream
xUÌ
@ྰï0QËÝ®Èi?(kb°hòý«ZD4ßÀΨ*;¡xº ¨#íªFrÄI!w2ËQ81®D<ÇS=Ólé82µ·>^åÊO- >[´SÀ
endstream
endobj
5 0 obj
<</Type/Font/Subtype/TrueType/Name/F1/BaseFont/ABCDEE+Calibri/Encoding/WinAnsiEncoding/FontDescriptor 6 0 R/FirstChar 32/LastChar 97/Widths 15 0 R>>
endobj
6 0 obj
<</Type/FontDescriptor/FontName/ABCDEE+Calibri/Flags 32/ItalicAngle 0/Ascent 750/Descent -250/CapHeight 750/AvgWidth 521/MaxWidth 1743/FontWeight 400/XHeight 250/StemV 52/FontBBox[ -503 -250 1240 750] /FontFile2 16 0 R>>
endobj
7 0 obj
不同之处例如在第 15 行和第 16 行的开头。
我的目标是加载文件并用base64编码，然后解码得到相同的文件。适合使用。
我想错误出在数据读取或写入或编码中。有什么建议么？
我的第一个建议是故障排除：确定您是否无法正确编码或解码或两者兼而有之。使用有效的实用程序和您的应用程序对文件进行编码并进行比较。使用您的应用程序和可用的实用程序解码正确编码的文件并进行比较。
第二个建议：将数据作为单独的字节处理，而不是可能被解释为 UTF-8 的文本。
以二进制模式打开PDF文件。请参阅 Reading binary file in Python and looping over each byte 了解如何执行此操作。将原始字节传递给您的 base64Encode。不要使用 bin 函数将字符串转换为二进制。
我完成了这个任务。将 .encode("UTF-8") 行替换为 .encode ("latin-1") 并且它至少适用于 pdf 文件。
我修改了原代码。这适用于文本、PNG 和 PDF，我没有尝试过其他文件类型，但我希望它适用于它们。
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Sat Mar 16 07:38:19 2019
@author: tracyanne
"""
import os
class Base64():
def __init__(self):
## We only need to do this once
self.b64 = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","0","1","2","3","4","5","6","7","8","9","+","/"]
def Encode(self, data):
alphabet = self.b64
bit_str = ""
base64_str = ""
for char in data:
bin_char = bin(char).lstrip("0b")
bin_char = bin_char.zfill(8)
bit_str += bin_char
brackets = [bit_str[x:x+6] for x in range(0,len(bit_str),6)]
for bracket in brackets:
if(len(bracket) < 6):
bracket = bracket + (6-len(bracket))*"0"
base64_str += alphabet[int(bracket,2)]
##Add padding characters to maintain compatibility with forced padding
padding_indicator = len(base64_str) % 4
if padding_indicator == 3:
base64_str += "="
elif padding_indicator == 2:
base64_str += "=="
return base64_str
def Decode(self, text, eof):
alphabet = self.b64
bit_str = ""
text_str = ""
for char in text:
if char in alphabet:
bin_char = bin(alphabet.index(char)).lstrip("0b")
bin_char = bin_char.zfill(6)
bit_str += bin_char
brackets = [bit_str[x:x+8] for x in range(0,len(bit_str),8)]
for bracket in brackets:
## When eof ignore last value in brackets to remove \x00
if eof and brackets[len(brackets) -1] == bracket:
pass
else:
text_str += chr(int(bracket,2))
## encode string as Latin-1 == ISO-8859-1
return text_str.encode("ISO-8859-1")
def base64Encode(self, inFile, outFile):
w = open(outFile, "w")
with open(inFile, "rb") as f:
byte = f.read(57)
while byte:
w.write(self.Encode(byte))
w.write("\n")
byte = f.read(57)
w.close()
f.close()
def base64Decode(self, inFile, outFile):
## Get size of input file for later comparison
fsize = os.path.getsize(inFile)
incsize = 0
eof = False
w = open(outFile, "wb")
with open(inFile, "r") as f:
byte = f.read(77)
while byte:
## keep current dataread and if current data read ==
## input file size set eof True
incsize += len(byte)
if fsize - incsize == 0:
eof = True
## Pass in eof to Decode
w.write(base64.base64Decode(byte, eof))
byte = f.read(77)
w.close()
f.close()
我自己的 base64 编码实现有问题。我已经获得了下面的代码。我想它只适用于带有英文字母的文本文件。比如pdf文件是编解码的，就是区别单个字符。
def base64Encode(data):
alphabet = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","0","1","2","3","4","5","6","7","8","9","+","/"]
bit_str = ""
base64_str = ""
for char in data:
bin_char = bin(char).lstrip("0b")
bin_char = bin_char.zfill(8)
bit_str += bin_char
brackets = [bit_str[x:x+6] for x in range(0,len(bit_str),6)]
for bracket in brackets:
if(len(bracket) < 6):
bracket = bracket + (6-len(bracket))*"0"
base64_str += alphabet[int(bracket,2)]
# print(brackets[-4:])
#if(bracket[-1:)
#print(len(base64_str))
#if(len(base64_str) != 76):
# base64_str += "="
return base64_str
def base64Decode(text):
alphabet = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","0","1","2","3","4","5","6","7","8","9","+","/"]
bit_str = ""
text_str = ""
for char in text:
if char in alphabet:
bin_char = bin(alphabet.index(char)).lstrip("0b")
bin_char = bin_char.zfill(6)
bit_str += bin_char
brackets = [bit_str[x:x+8] for x in range(0,len(bit_str),8)]
for bracket in brackets:
text_str += chr(int(bracket,2))
return text_str.encode("UTF-8")
w = open("encode.txt", "w")
with open("bla.txt", "rb") as f:
byte = f.read(57)
while byte:
w.write(base64Encode(byte))
w.write("\n")
byte = f.read(57)
w.close()
f.close()
w = open("decode.txt", "wb")
with open("encode.txt", "r") as f:
byte = f.read(77)
while byte:
w.write(base64Decode(byte))
byte = f.read(77)
w.close()
f.close()
在我看来，这一行 "return text_str.encode (" UTF-8 ")" 应该没有解码为 UTF-8。但是，如果只保留 "return text_str"，则会出现错误：TypeError: 'str' does not support the buffer interface.
bla.txt:
Phil Mercer reports on Cyclone Pam which has ravaged the Pacific nation of Vanuatu. Video courtesy of YouTube/Isso Nihmei at 350.org
Save the Children's Vanuatu country director Tom Skirrow said on Saturday: "The scene here this morning is complete devastation - houses are destroyed, trees are down, roads are blocked and people are wandering the streets looking for help.
ĄŚĆŹŻÓ
encode.txt
UGhpbCBNZXJjZXIgcmVwb3J0cyBvbiBDeWNsb25lIFBhbSB3aGljaCBoYXMgcmF2YWdlZCB0aGUg
UGFjaWZpYyBuYXRpb24gb2YgVmFudWF0dS4gVmlkZW8gY291cnRlc3kgb2YgWW91VHViZS9Jc3Nv
IE5paG1laSBhdCAzNTAub3JnDQoNClNhdmUgdGhlIENoaWxkcmVuJ3MgVmFudWF0dSBjb3VudHJ5
IGRpcmVjdG9yIFRvbSBTa2lycm93IHNhaWQgb24gU2F0dXJkYXk6ICJUaGUgc2NlbmUgaGVyZSB0
aGlzIG1vcm5pbmcgaXMgY29tcGxldGUgZGV2YXN0YXRpb24gLSBob3VzZXMgYXJlIGRlc3Ryb3ll
ZCwgdHJlZXMgYXJlIGRvd24sIHJvYWRzIGFyZSBibG9ja2VkIGFuZCBwZW9wbGUgYXJlIHdhbmRl
cmluZyB0aGUgc3RyZWV0cyBsb29raW5nIGZvciBoZWxwLg0KDQrEhMWaxIbFucW7w5M
decode.txt
Phil Mercer reports on Cyclone Pam which has ravaged the Pacific nation of Vanuatu. Video courtesy of YouTube/Isso Nihmei at 350.org
Save the Children's Vanuatu country director Tom Skirrow said on Saturday: "The scene here this morning is complete devastation - houses are destroyed, trees are down, roads are blocked and people are wandering the streets looking for help.
ÄÅÄŹŻÃ
页面编码的相同文本：http://www.motobit.com/util/base64-decoder-encoder.asp
UGhpbCBNZXJjZXIgcmVwb3J0cyBvbiBDeWNsb25lIFBhbSB3aGljaCBoYXMgcmF2YWdlZCB0aGUg
UGFjaWZpYyBuYXRpb24gb2YgVmFudWF0dS4gVmlkZW8gY291cnRlc3kgb2YgWW91VHViZS9Jc3Nv
IE5paG1laSBhdCAzNTAub3JnDQoNClNhdmUgdGhlIENoaWxkcmVuJ3MgVmFudWF0dSBjb3VudHJ5
IGRpcmVjdG9yIFRvbSBTa2lycm93IHNhaWQgb24gU2F0dXJkYXk6ICJUaGUgc2NlbmUgaGVyZSB0
aGlzIG1vcm5pbmcgaXMgY29tcGxldGUgZGV2YXN0YXRpb24gLSBob3VzZXMgYXJlIGRlc3Ryb3ll
ZCwgdHJlZXMgYXJlIGRvd24sIHJvYWRzIGFyZSBibG9ja2VkIGFuZCBwZW9wbGUgYXJlIHdhbmRl
cmluZyB0aGUgc3RyZWV0cyBsb29raW5nIGZvciBoZWxwLg0KDQrEhMWaxIbFucW7w5M=
除“=”外同理，因文件开头错误而省略
以及 pdf 格式的示例原始文件：
%PDF-1.5
%µµµµ
1 0 obj
<</Type/Catalog/Pages 2 0 R/Lang(pl-PL) /StructTreeRoot 8 0 R/MarkInfo<</Marked true>>>>
endobj
2 0 obj
<</Type/Pages/Count 1/Kids[ 3 0 R] >>
endobj
3 0 obj
<</Type/Page/Parent 2 0 R/Resources<</Font<</F1 5 0 R>>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<</Type/Group/S/Transparency/CS/DeviceRGB>>/Tabs/S/StructParents 0>>
endobj
4 0 obj
<</Filter/FlateDecode/Length 110>>
stream
xœUÌ
€@ྰï0QËÝ®Èiž?(†kb°hòý«ZD˜4ßÀΨ*;…¡xº ¨#“íªFrÄI!w…˜2ËQ81®D<™ÇS=Ó’léŠ82µ·>^åŒÊO- >[´SÀ
endstream
endobj
5 0 obj
<</Type/Font/Subtype/TrueType/Name/F1/BaseFont/ABCDEE+Calibri/Encoding/WinAnsiEncoding/FontDescriptor 6 0 R/FirstChar 32/LastChar 97/Widths 15 0 R>>
endobj
6 0 obj
<</Type/FontDescriptor/FontName/ABCDEE+Calibri/Flags 32/ItalicAngle 0/Ascent 750/Descent -250/CapHeight 750/AvgWidth 521/MaxWidth 1743/FontWeight 400/XHeight 250/StemV 52/FontBBox[ -503 -250 1240 750] /FontFile2 16 0 R>>
endobj
7 0 obj
执行脚本后：
%PDF-1.5
%µµµµ
1 0 obj
<</Type/Catalog/Pages 2 0 R/Lang(pl-PL) /StructTreeRoot 8 0 R/MarkInfo<</Marked true>>>>
endobj
2 0 obj
<</Type/Pages/Count 1/Kids[ 3 0 R] >>
endobj
3 0 obj
<</Type/Page/Parent 2 0 R/Resources<</Font<</F1 5 0 R>>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<</Type/Group/S/Transparency/CS/DeviceRGB>>/Tabs/S/StructParents 0>>
endobj
4 0 obj
<</Filter/FlateDecode/Length 110>>
stream
xUÌ
@ྰï0QËÝ®Èi?(kb°hòý«ZD4ßÀΨ*;¡xº ¨#íªFrÄI!w2ËQ81®D<ÇS=Ólé82µ·>^åÊO- >[´SÀ
endstream
endobj
5 0 obj
<</Type/Font/Subtype/TrueType/Name/F1/BaseFont/ABCDEE+Calibri/Encoding/WinAnsiEncoding/FontDescriptor 6 0 R/FirstChar 32/LastChar 97/Widths 15 0 R>>
endobj
6 0 obj
<</Type/FontDescriptor/FontName/ABCDEE+Calibri/Flags 32/ItalicAngle 0/Ascent 750/Descent -250/CapHeight 750/AvgWidth 521/MaxWidth 1743/FontWeight 400/XHeight 250/StemV 52/FontBBox[ -503 -250 1240 750] /FontFile2 16 0 R>>
endobj
7 0 obj
不同之处例如在第 15 行和第 16 行的开头。
我的目标是加载文件并用base64编码，然后解码得到相同的文件。适合使用。 我想错误出在数据读取或写入或编码中。有什么建议么？
我的第一个建议是故障排除：确定您是否无法正确编码或解码或两者兼而有之。使用有效的实用程序和您的应用程序对文件进行编码并进行比较。使用您的应用程序和可用的实用程序解码正确编码的文件并进行比较。 第二个建议：将数据作为单独的字节处理，而不是可能被解释为 UTF-8 的文本。
以二进制模式打开PDF文件。请参阅 Reading binary file in Python and looping over each byte 了解如何执行此操作。将原始字节传递给您的 base64Encode。不要使用 bin 函数将字符串转换为二进制。
我完成了这个任务。将 .encode("UTF-8") 行替换为 .encode ("latin-1") 并且它至少适用于 pdf 文件。
我修改了原代码。这适用于文本、PNG 和 PDF，我没有尝试过其他文件类型，但我希望它适用于它们。
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Sat Mar 16 07:38:19 2019
@author: tracyanne
"""
import os
class Base64():
def __init__(self):
## We only need to do this once
self.b64 = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","0","1","2","3","4","5","6","7","8","9","+","/"]
def Encode(self, data):
alphabet = self.b64
bit_str = ""
base64_str = ""
for char in data:
bin_char = bin(char).lstrip("0b")
bin_char = bin_char.zfill(8)
bit_str += bin_char
brackets = [bit_str[x:x+6] for x in range(0,len(bit_str),6)]
for bracket in brackets:
if(len(bracket) < 6):
bracket = bracket + (6-len(bracket))*"0"
base64_str += alphabet[int(bracket,2)]
##Add padding characters to maintain compatibility with forced padding
padding_indicator = len(base64_str) % 4
if padding_indicator == 3:
base64_str += "="
elif padding_indicator == 2:
base64_str += "=="
return base64_str
def Decode(self, text, eof):
alphabet = self.b64
bit_str = ""
text_str = ""
for char in text:
if char in alphabet:
bin_char = bin(alphabet.index(char)).lstrip("0b")
bin_char = bin_char.zfill(6)
bit_str += bin_char
brackets = [bit_str[x:x+8] for x in range(0,len(bit_str),8)]
for bracket in brackets:
## When eof ignore last value in brackets to remove \x00
if eof and brackets[len(brackets) -1] == bracket:
pass
else:
text_str += chr(int(bracket,2))
## encode string as Latin-1 == ISO-8859-1
return text_str.encode("ISO-8859-1")
def base64Encode(self, inFile, outFile):
w = open(outFile, "w")
with open(inFile, "rb") as f:
byte = f.read(57)
while byte:
w.write(self.Encode(byte))
w.write("\n")
byte = f.read(57)
w.close()
f.close()
def base64Decode(self, inFile, outFile):
## Get size of input file for later comparison
fsize = os.path.getsize(inFile)
incsize = 0
eof = False
w = open(outFile, "wb")
with open(inFile, "r") as f:
byte = f.read(77)
while byte:
## keep current dataread and if current data read ==
## input file size set eof True
incsize += len(byte)
if fsize - incsize == 0:
eof = True
## Pass in eof to Decode
w.write(base64.base64Decode(byte, eof))
byte = f.read(77)
w.close()
f.close()