Sha256: f0c8771b964d19713321a60f2b842cc4ce09cd51749210fd8bcbc585fbe89855
Contents?: true
Size: 799 Bytes
Versions: 10
Compression:
Stored size: 799 Bytes
Contents
class BaseX
BASE62 = ["0".."9", "a".."z", "A".."Z"].map { |r| r.to_a }.flatten
attr :chars, :base, :values
def initialize(chars=BASE62)
@chars = chars
@base = @chars.size
@values = Hash[*(0...@base).map { |i| [ @chars[i], i ] }.flatten]
end
def encode(byte_string)
convert_base(byte_string.unpack("C*"), 256, @base).map { |d|
@chars[d]
}.join('')
end
def decode(encoded)
convert_base(encoded.split('').map { |c|
@values[c]
}, @base, 256).pack("C*")
end
def convert_base(digits, from_base, to_base)
bignum = 0
digits.each { |digit| bignum = bignum * from_base + digit }
converted = []
until bignum.zero?
bignum, digit = bignum.divmod to_base
converted.push digit
end
converted.reverse
end
end
Version data entries
10 entries across 10 versions & 2 rubygems