This module provides data encoding and decoding as specified in RFC 3548.This standard defines the Base16, Base32, and Base64 algorithms for encoding anddecoding arbitrary binary strings into text strings that can be safely sent byemail, used as parts of URLs, or included as part of an HTTP POST request. Theencoding algorithm is not the same as the uuencode program.
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There are two interfaces provided by this module. The modern interface supportsencoding and decoding string objects using both base-64 alphabets definedin RFC 3548 (normal, and URL- and filesystem-safe). The legacyinterface provides for encoding and decoding to and from file-like objects aswell as strings, but only using the Base64 standard alphabet.
The modern interface, which was introduced in Python 2.4, provides:
Nested Class Summary; static class: Base64.InputStream A Base64.InputStream will read data from another java.io.InputStream, given in the constructor, and encode/decode to/from Base64 notation on the fly.: static class: Base64.OutputStream A Base64.OutputStream will write data to another java.io.OutputStream, given in the constructor, and encode/decode to/from Base64 notation on the fly. The first symbol is simply letter 'a' that takes one byte, the second symbol is a foreign language character that takes two bytes, the third symbol is a triangle that takes three bytes, and finally the fourth symbol is weird 'z' letter that takes four bytes. As a result there are 4+3+2+1 = 10 bytes total in the output. Parses, serializes, and manipulates MIME types, according to the WHATWG MIME Sniffing Standard. Content-type; mime type; mimesniff. JSFiddle or its authors are not responsible or liable for any loss or damage of any kind during the usage of provided code. Bug tracker Roadmap (vote. But for our loyal users we also have new tasty PRO features: Become a supporter. Doctype Body tag. Frameworks & Extensions. Firebug Lite QUnit jQuery Lint. Bensamgold, I've learnt a bit about base64 encoding in the last few months, and it turns out not all base64 is the same. Basically you can choose between different character sets for the encode, and some systems choose different sets that others.
base64.
b64encode
(s[, altchars])¶Encode a string using Base64.
s is the string to encode. Optional altchars must be a string of at leastlength 2 (additional characters are ignored) which specifies an alternativealphabet for the +
and /
characters. This allows an application to e.g.generate URL or filesystem safe Base64 strings. The default is None
, forwhich the standard Base64 alphabet is used.
The encoded string is returned.
base64.
b64decode
(s[, altchars])¶Decode a Base64 encoded string.
s is the string to decode. Optional altchars must be a string of at leastlength 2 (additional characters are ignored) which specifies the alternativealphabet used instead of the +
and /
characters.
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The decoded string is returned. A TypeError
is raised if s isincorrectly padded. Characters that are neitherin the normal base-64 alphabet nor the alternative alphabet arediscarded prior to the padding check.
base64.
standard_b64encode
(s)¶Encode string s using the standard Base64 alphabet.
base64.
standard_b64decode
(s)¶Decode string s using the standard Base64 alphabet.
base64.
urlsafe_b64encode
(s)¶Encode string s using the URL- and filesystem-safealphabet, which substitutes -
instead of+
and _
instead of /
in the standard Base64 alphabet. The resultcan still contain =
.
base64.
urlsafe_b64decode
(s)¶Decode string s using the URL- and filesystem-safealphabet, which substitutes -
instead of+
and _
instead of /
in the standard Base64 alphabet.
base64.
b32encode
(s)¶Encode a string using Base32. s is the string to encode. The encoded stringis returned.
base64.
b32decode
(s[, casefold[, map01]])¶Decode a Base32 encoded string.
s is the string to decode. Optional casefold is a flag specifying whether alowercase alphabet is acceptable as input. For security purposes, the defaultis False
.
RFC 3548 allows for optional mapping of the digit 0 (zero) to the letter O(oh), and for optional mapping of the digit 1 (one) to either the letter I (eye)or letter L (el). The optional argument map01 when not None
, specifieswhich letter the digit 1 should be mapped to (when map01 is not None
, thedigit 0 is always mapped to the letter O). For security purposes the default isNone
, so that 0 and 1 are not allowed in the input.
The decoded string is returned. A TypeError
is raised if s isincorrectly padded or if there are non-alphabet characters present in thestring.
base64.
b16encode
(s)¶Base64 Pro 2.1 Tutorial
Encode a string using Base16.
s is the string to encode. The encoded string is returned.
base64.
b16decode
(s[, casefold])¶Decode a Base16 encoded string.
s is the string to decode. Optional casefold is a flag specifying whether alowercase alphabet is acceptable as input. For security purposes, the defaultis False
.
The decoded string is returned. A TypeError
is raised if s wereincorrectly padded or if there are non-alphabet characters present in thestring.
The legacy interface:
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base64.
decode
(input, output)¶Decode the contents of the input file and write the resulting binary data tothe output file. input and output must either be file objects or objectsthat mimic the file object interface. input will be read untilinput.read()
returns an empty string.
base64.
decodestring
(s)¶Decode the string s, which must contain one or more lines of base64 encodeddata, and return a string containing the resulting binary data.
base64.
encode
(input, output)¶Encode the contents of the input file and write the resulting base64 encodeddata to the output file. input and output must either be file objects orobjects that mimic the file object interface. input will be read untilinput.read()
returns an empty string. encode()
returns the encodeddata plus a trailing newline character ('n'
).
base64.
encodestring
(s)¶Encode the string s, which can contain arbitrary binary data, and return astring containing one or more lines of base64-encoded data.encodestring()
returns a string containing one or more lines ofbase64-encoded data always including an extra trailing newline ('n'
).
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An example usage of the module:
See also
binascii
Support module containing ASCII-to-binary and binary-to-ASCII conversions.
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Section 5.2, “Base64 Content-Transfer-Encoding,” provides the definition of thebase64 encoding.
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/* Library: Base64 |
* Functions for Base64 (en de)coding |
* Version: |
* v1.0.00.00 |
* Requirements: |
* AutoHotkey v1.1.20.00+ OR v2.0-a+ (latest preferred) |
* Windows XP or higher |
* Installation: |
* Use #Include or copy to a function library folder |
* Remarks: |
* Based on similar lib(s) found in the forum. |
*/ |
/* Function: Base64_Encode |
* Encode data to Base64 |
* Syntax: |
* bytes := Base64_Encode( ByRef data, len, ByRef out [ , mode := 'A' ] ) |
* Parameter(s): |
* bytes [retval] - on success, the number of bytes copied to 'out'. |
* data [in, ByRef] - data to encode |
* len [in] - size in bytes of 'data'. Specify '-1' to automtically |
* calculate the size. |
* out [out, ByRef] - out variable containing the Base64 encoded data |
* mode [in, opt] - Specify 'A'(default) to use the ANSI version of |
* 'CryptBinaryToString'. Otherwise, 'W' for UNICODE. |
*/ |
Base64_Encode(ByRef data, len:=-1, ByRef out:=', mode:='A') |
{ |
if!InStr('AW', mode := Format('{:U}', mode), true) |
mode := 'A' |
BytesPerChar := mode'W' ? 2 : 1 |
if (Round(len) <= 0) |
len := StrLen(data) * (A_IsUnicode ? 2 : 1) |
; CRYPT_STRING_BASE64 := 0x00000001 |
ifDllCall('Crypt32CryptBinaryToString' . mode, 'Ptr', &data, 'UInt', len |
, 'UInt', 0x00000001, 'Ptr', 0, 'UIntP', size) |
{ |
VarSetCapacity(out, size *= BytesPerChar, 0) |
ifDllCall('Crypt32CryptBinaryToString' . mode, 'Ptr', &data, 'UInt', len |
, 'UInt', 0x00000001, 'Ptr', &out, 'UIntP', size) |
return size * BytesPerChar |
} |
} |
/* Function: Base64_Decode |
* Decode Base64 encoded data |
* Syntax: |
* bytes := Base64_Decode( ByRef data, ByRef out [ , mode := 'A' ] ) |
* Parameter(s): |
* bytes [retval] - on success, the number of bytes copied to 'out'. |
* data [in, ByRef] - data(NULL-terminated) to decode |
* out [out, ByRef] - out variable containing the decoded data |
* mode [in, opt] - Specify 'A'(default) to use the ANSI version of |
* 'CryptStringToBinary'. Otherwise, 'W' for UNICODE. |
*/ |
Base64_Decode(ByRef data, ByRef out, mode:='A') |
{ |
if!InStr('AW', mode := Format('{:U}', mode), true) |
mode := 'A' |
; CRYPT_STRING_BASE64 := 0x00000001 |
ifDllCall('Crypt32CryptStringToBinary' . mode, 'Ptr', &data, 'UInt', 0 |
, 'UInt', 0x00000001, 'Ptr', 0, 'UIntP', size, 'Ptr', 0, 'Ptr', 0) |
{ |
VarSetCapacity(out, size, 0) |
ifDllCall('Crypt32CryptStringToBinary' . mode, 'Ptr', &data, 'UInt', 0 |
, 'UInt', 0x00000001, 'Ptr', &out, 'UIntP', size, 'Ptr', 0, 'Ptr', 0) |
return size |
} |
} |
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