This example encodes the string "Hello" in ASCII and then in Base64. One equal sign ("=") is added to the encoded string.ĭepending on the format (for instance, this is required in MIME), a newline is inserted every 76 characters in the encoded string. The size has extra two bytes (remainder of 16 bits when divided by 24): Same as above, but we pad just one byte.Two equal signs ("=") are added to the encoded string. This leaves us with one byte (8 bits) we pad the remaining byte with two bytes with value zero and encode the last sequence. The size has an extra byte (remainder of 8 bits when divided by 24): Bits that can be encoded in the beginning are encoded normally.The size in bytes is divisible by three (bits divisible by 24): All bits are encoded normally. Because the ASCII standard defines the use of seven bits, Base64 only uses 6 bits (corresponding to 26 64 characters) to ensure the encoded data is.There are also three cases to consider depending on the size of the input: when the size in bytes is divisible by 3 (bits divisible by 24), with an extra byte (8 bits extra, or remainder of 1 byte when divided by three) and with two extra bytes The equals sign "=" represents a padding, usually seen at the end of a Base64 encoded sequence.Įach group of six bits is encoded using the above conversion. In Base64, 0 to 25 correspond to A to Z, 26 to 51 correspond to (lowercase) a to z, 52 to 61 correspond to digits 0 to 9, 62 corresponds to the plus sign "+", and 63 corresponds to the slash sign "/". Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait Method Detail encode public byte encode (byte src) Encodes all bytes from the specified byte array into a newly-allocated byte array using the Base64 encoding scheme. One of the main advantages of Base64 is that it is a simple and efficient way to encode binary data. Base64.Decoder Method Summary Methods inherited from class java.lang. (The extra 65th character, '', is used to signify a special processing function. A 65-character subset of US-ASCII is used, enabling 6 bits to be represented per printable character. It is a way of converting binary data into ASCII characters, which can be transmitted over the network without any issues. The Base 64 encoding is designed to represent arbitrary sequences of octets in a form that requires case sensitivity but need not be humanly readable. It is so called because it uses a set of 64 characters to encode each sequence of six bits, similar to a mathematical base 64. Base64 is a widely used encoding method for digital data and is often used in emails, web pages and other internet protocols. If encode is TRUE, a character vector with a class named base64. Base64 is a method used to convert binary data into a string. These functions encode and decode strings using base64 representations.
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