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Diffstat (limited to 'vendor/bundle/ruby/3.4.0/gems/base64-0.3.0/lib/base64.rb')
| -rw-r--r-- | vendor/bundle/ruby/3.4.0/gems/base64-0.3.0/lib/base64.rb | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/vendor/bundle/ruby/3.4.0/gems/base64-0.3.0/lib/base64.rb b/vendor/bundle/ruby/3.4.0/gems/base64-0.3.0/lib/base64.rb new file mode 100644 index 0000000..8c0145d --- /dev/null +++ b/vendor/bundle/ruby/3.4.0/gems/base64-0.3.0/lib/base64.rb @@ -0,0 +1,381 @@ +# frozen_string_literal: true +# +# \Module \Base64 provides methods for: +# +# - \Encoding a binary string (containing non-ASCII characters) +# as a string of printable ASCII characters. +# - Decoding such an encoded string. +# +# \Base64 is commonly used in contexts where binary data +# is not allowed or supported: +# +# - Images in HTML or CSS files, or in URLs. +# - Email attachments. +# +# A \Base64-encoded string is about one-third larger that its source. +# See the {Wikipedia article}[https://en.wikipedia.org/wiki/Base64] +# for more information. +# +# This module provides three pairs of encode/decode methods. +# Your choices among these methods should depend on: +# +# - Which character set is to be used for encoding and decoding. +# - Whether "padding" is to be used. +# - Whether encoded strings are to contain newlines. +# +# Note: Examples on this page assume that the including program has executed: +# +# require 'base64' +# +# == \Encoding Character Sets +# +# A \Base64-encoded string consists only of characters from a 64-character set: +# +# - <tt>('A'..'Z')</tt>. +# - <tt>('a'..'z')</tt>. +# - <tt>('0'..'9')</tt>. +# - <tt>=</tt>, the 'padding' character. +# - Either: +# - <tt>%w[+ /]</tt>: +# {RFC-2045-compliant}[https://datatracker.ietf.org/doc/html/rfc2045]; +# _not_ safe for URLs. +# - <tt>%w[- _]</tt>: +# {RFC-4648-compliant}[https://datatracker.ietf.org/doc/html/rfc4648]; +# safe for URLs. +# +# If you are working with \Base64-encoded strings that will come from +# or be put into URLs, you should choose this encoder-decoder pair +# of RFC-4648-compliant methods: +# +# - Base64.urlsafe_encode64 and Base64.urlsafe_decode64. +# +# Otherwise, you may choose any of the pairs in this module, +# including the pair above, or the RFC-2045-compliant pairs: +# +# - Base64.encode64 and Base64.decode64. +# - Base64.strict_encode64 and Base64.strict_decode64. +# +# == Padding +# +# \Base64-encoding changes a triplet of input bytes +# into a quartet of output characters. +# +# <b>Padding in Encode Methods</b> +# +# Padding -- extending an encoded string with zero, one, or two trailing +# <tt>=</tt> characters -- is performed by methods Base64.encode64, +# Base64.strict_encode64, and, by default, Base64.urlsafe_encode64: +# +# Base64.encode64('s') # => "cw==\n" +# Base64.strict_encode64('s') # => "cw==" +# Base64.urlsafe_encode64('s') # => "cw==" +# Base64.urlsafe_encode64('s', padding: false) # => "cw" +# +# When padding is performed, the encoded string is always of length <em>4n</em>, +# where +n+ is a non-negative integer: +# +# - Input bytes of length <em>3n</em> generate unpadded output characters +# of length <em>4n</em>: +# +# # n = 1: 3 bytes => 4 characters. +# Base64.strict_encode64('123') # => "MDEy" +# # n = 2: 6 bytes => 8 characters. +# Base64.strict_encode64('123456') # => "MDEyMzQ1" +# +# - Input bytes of length <em>3n+1</em> generate padded output characters +# of length <em>4(n+1)</em>, with two padding characters at the end: +# +# # n = 1: 4 bytes => 8 characters. +# Base64.strict_encode64('1234') # => "MDEyMw==" +# # n = 2: 7 bytes => 12 characters. +# Base64.strict_encode64('1234567') # => "MDEyMzQ1Ng==" +# +# - Input bytes of length <em>3n+2</em> generate padded output characters +# of length <em>4(n+1)</em>, with one padding character at the end: +# +# # n = 1: 5 bytes => 8 characters. +# Base64.strict_encode64('12345') # => "MDEyMzQ=" +# # n = 2: 8 bytes => 12 characters. +# Base64.strict_encode64('12345678') # => "MDEyMzQ1Njc=" +# +# When padding is suppressed, for a positive integer <em>n</em>: +# +# - Input bytes of length <em>3n</em> generate unpadded output characters +# of length <em>4n</em>: +# +# # n = 1: 3 bytes => 4 characters. +# Base64.urlsafe_encode64('123', padding: false) # => "MDEy" +# # n = 2: 6 bytes => 8 characters. +# Base64.urlsafe_encode64('123456', padding: false) # => "MDEyMzQ1" +# +# - Input bytes of length <em>3n+1</em> generate unpadded output characters +# of length <em>4n+2</em>, with two padding characters at the end: +# +# # n = 1: 4 bytes => 6 characters. +# Base64.urlsafe_encode64('1234', padding: false) # => "MDEyMw" +# # n = 2: 7 bytes => 10 characters. +# Base64.urlsafe_encode64('1234567', padding: false) # => "MDEyMzQ1Ng" +# +# - Input bytes of length <em>3n+2</em> generate unpadded output characters +# of length <em>4n+3</em>, with one padding character at the end: +# +# # n = 1: 5 bytes => 7 characters. +# Base64.urlsafe_encode64('12345', padding: false) # => "MDEyMzQ" +# # m = 2: 8 bytes => 11 characters. +# Base64.urlsafe_encode64('12345678', padding: false) # => "MDEyMzQ1Njc" +# +# <b>Padding in Decode Methods</b> +# +# All of the \Base64 decode methods support (but do not require) padding. +# +# \Method Base64.decode64 does not check the size of the padding: +# +# Base64.decode64("MDEyMzQ1Njc") # => "01234567" +# Base64.decode64("MDEyMzQ1Njc=") # => "01234567" +# Base64.decode64("MDEyMzQ1Njc==") # => "01234567" +# +# \Method Base64.strict_decode64 strictly enforces padding size: +# +# Base64.strict_decode64("MDEyMzQ1Njc") # Raises ArgumentError +# Base64.strict_decode64("MDEyMzQ1Njc=") # => "01234567" +# Base64.strict_decode64("MDEyMzQ1Njc==") # Raises ArgumentError +# +# \Method Base64.urlsafe_decode64 allows padding in the encoded string, +# which if present, must be correct: +# see {Padding}[Base64.html#module-Base64-label-Padding], above: +# +# Base64.urlsafe_decode64("MDEyMzQ1Njc") # => "01234567" +# Base64.urlsafe_decode64("MDEyMzQ1Njc=") # => "01234567" +# Base64.urlsafe_decode64("MDEyMzQ1Njc==") # Raises ArgumentError. +# +# == Newlines +# +# An encoded string returned by Base64.encode64 or Base64.urlsafe_encode64 +# has an embedded newline character +# after each 60-character sequence, and, if non-empty, at the end: +# +# # No newline if empty. +# encoded = Base64.encode64("\x00" * 0) +# encoded.index("\n") # => nil +# +# # Newline at end of short output. +# encoded = Base64.encode64("\x00" * 1) +# encoded.size # => 4 +# encoded.index("\n") # => 4 +# +# # Newline at end of longer output. +# encoded = Base64.encode64("\x00" * 45) +# encoded.size # => 60 +# encoded.index("\n") # => 60 +# +# # Newlines embedded and at end of still longer output. +# encoded = Base64.encode64("\x00" * 46) +# encoded.size # => 65 +# encoded.rindex("\n") # => 65 +# encoded.split("\n").map {|s| s.size } # => [60, 4] +# +# The string to be encoded may itself contain newlines, +# which are encoded as \Base64: +# +# # Base64.encode64("\n\n\n") # => "CgoK\n" +# s = "This is line 1\nThis is line 2\n" +# Base64.encode64(s) # => "VGhpcyBpcyBsaW5lIDEKVGhpcyBpcyBsaW5lIDIK\n" +# +module Base64 + + VERSION = "0.3.0" + + module_function + + # :call-seq: + # Base64.encode64(string) -> encoded_string + # + # Returns a string containing the RFC-2045-compliant \Base64-encoding of +string+. + # + # Per RFC 2045, the returned string may contain the URL-unsafe characters + # <tt>+</tt> or <tt>/</tt>; + # see {Encoding Character Set}[Base64.html#module-Base64-label-Encoding+Character+Sets] above: + # + # Base64.encode64("\xFB\xEF\xBE") # => "++++\n" + # Base64.encode64("\xFF\xFF\xFF") # => "////\n" + # + # The returned string may include padding; + # see {Padding}[Base64.html#module-Base64-label-Padding] above. + # + # Base64.encode64('*') # => "Kg==\n" + # + # The returned string ends with a newline character, and if sufficiently long + # will have one or more embedded newline characters; + # see {Newlines}[Base64.html#module-Base64-label-Newlines] above: + # + # Base64.encode64('*') # => "Kg==\n" + # Base64.encode64('*' * 46) + # # => "KioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioq\nKg==\n" + # + # The string to be encoded may itself contain newlines, + # which will be encoded as ordinary \Base64: + # + # Base64.encode64("\n\n\n") # => "CgoK\n" + # s = "This is line 1\nThis is line 2\n" + # Base64.encode64(s) # => "VGhpcyBpcyBsaW5lIDEKVGhpcyBpcyBsaW5lIDIK\n" + # + def encode64(bin) + [bin].pack("m") + end + + # :call-seq: + # Base64.decode(encoded_string) -> decoded_string + # + # Returns a string containing the decoding of an RFC-2045-compliant + # \Base64-encoded string +encoded_string+: + # + # s = "VGhpcyBpcyBsaW5lIDEKVGhpcyBpcyBsaW5lIDIK\n" + # Base64.decode64(s) # => "This is line 1\nThis is line 2\n" + # + # Non-\Base64 characters in +encoded_string+ are ignored; + # see {Encoding Character Set}[Base64.html#module-Base64-label-Encoding+Character+Sets] above: + # these include newline characters and characters <tt>-</tt> and <tt>/</tt>: + # + # Base64.decode64("\x00\n-_") # => "" + # + # Padding in +encoded_string+ (even if incorrect) is ignored: + # + # Base64.decode64("MDEyMzQ1Njc") # => "01234567" + # Base64.decode64("MDEyMzQ1Njc=") # => "01234567" + # Base64.decode64("MDEyMzQ1Njc==") # => "01234567" + # + def decode64(str) + str.unpack1("m") + end + + # :call-seq: + # Base64.strict_encode64(string) -> encoded_string + # + # Returns a string containing the RFC-2045-compliant \Base64-encoding of +string+. + # + # Per RFC 2045, the returned string may contain the URL-unsafe characters + # <tt>+</tt> or <tt>/</tt>; + # see {Encoding Character Set}[Base64.html#module-Base64-label-Encoding+Character+Sets] above: + # + # Base64.strict_encode64("\xFB\xEF\xBE") # => "++++\n" + # Base64.strict_encode64("\xFF\xFF\xFF") # => "////\n" + # + # The returned string may include padding; + # see {Padding}[Base64.html#module-Base64-label-Padding] above. + # + # Base64.strict_encode64('*') # => "Kg==\n" + # + # The returned string will have no newline characters, regardless of its length; + # see {Newlines}[Base64.html#module-Base64-label-Newlines] above: + # + # Base64.strict_encode64('*') # => "Kg==" + # Base64.strict_encode64('*' * 46) + # # => "KioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKg==" + # + # The string to be encoded may itself contain newlines, + # which will be encoded as ordinary \Base64: + # + # Base64.strict_encode64("\n\n\n") # => "CgoK" + # s = "This is line 1\nThis is line 2\n" + # Base64.strict_encode64(s) # => "VGhpcyBpcyBsaW5lIDEKVGhpcyBpcyBsaW5lIDIK" + # + def strict_encode64(bin) + [bin].pack("m0") + end + + # :call-seq: + # Base64.strict_decode64(encoded_string) -> decoded_string + # + # Returns a string containing the decoding of an RFC-2045-compliant + # \Base64-encoded string +encoded_string+: + # + # s = "VGhpcyBpcyBsaW5lIDEKVGhpcyBpcyBsaW5lIDIK" + # Base64.strict_decode64(s) # => "This is line 1\nThis is line 2\n" + # + # Non-\Base64 characters in +encoded_string+ are not allowed; + # see {Encoding Character Set}[Base64.html#module-Base64-label-Encoding+Character+Sets] above: + # these include newline characters and characters <tt>-</tt> and <tt>/</tt>: + # + # Base64.strict_decode64("\n") # Raises ArgumentError + # Base64.strict_decode64('-') # Raises ArgumentError + # Base64.strict_decode64('_') # Raises ArgumentError + # + # Padding in +encoded_string+, if present, must be correct: + # + # Base64.strict_decode64("MDEyMzQ1Njc") # Raises ArgumentError + # Base64.strict_decode64("MDEyMzQ1Njc=") # => "01234567" + # Base64.strict_decode64("MDEyMzQ1Njc==") # Raises ArgumentError + # + def strict_decode64(str) + str.unpack1("m0") + end + + # :call-seq: + # Base64.urlsafe_encode64(string) -> encoded_string + # + # Returns the RFC-4648-compliant \Base64-encoding of +string+. + # + # Per RFC 4648, the returned string will not contain the URL-unsafe characters + # <tt>+</tt> or <tt>/</tt>, + # but instead may contain the URL-safe characters + # <tt>-</tt> and <tt>_</tt>; + # see {Encoding Character Set}[Base64.html#module-Base64-label-Encoding+Character+Sets] above: + # + # Base64.urlsafe_encode64("\xFB\xEF\xBE") # => "----" + # Base64.urlsafe_encode64("\xFF\xFF\xFF") # => "____" + # + # By default, the returned string may have padding; + # see {Padding}[Base64.html#module-Base64-label-Padding], above: + # + # Base64.urlsafe_encode64('*') # => "Kg==" + # + # Optionally, you can suppress padding: + # + # Base64.urlsafe_encode64('*', padding: false) # => "Kg" + # + # The returned string will have no newline characters, regardless of its length; + # see {Newlines}[Base64.html#module-Base64-label-Newlines] above: + # + # Base64.urlsafe_encode64('*') # => "Kg==" + # Base64.urlsafe_encode64('*' * 46) + # # => "KioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKg==" + # + def urlsafe_encode64(bin, padding: true) + str = strict_encode64(bin) + str.chomp!("==") or str.chomp!("=") unless padding + str.tr!("+/", "-_") + str + end + + # :call-seq: + # Base64.urlsafe_decode64(encoded_string) -> decoded_string + # + # Returns the decoding of an RFC-4648-compliant \Base64-encoded string +encoded_string+: + # + # +encoded_string+ may not contain non-Base64 characters; + # see {Encoding Character Set}[Base64.html#module-Base64-label-Encoding+Character+Sets] above: + # + # Base64.urlsafe_decode64('+') # Raises ArgumentError. + # Base64.urlsafe_decode64('/') # Raises ArgumentError. + # Base64.urlsafe_decode64("\n") # Raises ArgumentError. + # + # Padding in +encoded_string+, if present, must be correct: + # see {Padding}[Base64.html#module-Base64-label-Padding], above: + # + # Base64.urlsafe_decode64("MDEyMzQ1Njc") # => "01234567" + # Base64.urlsafe_decode64("MDEyMzQ1Njc=") # => "01234567" + # Base64.urlsafe_decode64("MDEyMzQ1Njc==") # Raises ArgumentError. + # + def urlsafe_decode64(str) + # NOTE: RFC 4648 does say nothing about unpadded input, but says that + # "the excess pad characters MAY also be ignored", so it is inferred that + # unpadded input is also acceptable. + if !str.end_with?("=") && str.length % 4 != 0 + str = str.ljust((str.length + 3) & ~3, "=") + str.tr!("-_", "+/") + else + str = str.tr("-_", "+/") + end + strict_decode64(str) + end +end |