Base64

Base64

Functionality for base64 encoding and decoding, a method to represent binary data using text, common on the web.

Base64EncodePipe(ostream)

Return a new write-only I/O stream, which converts any bytes written to it into base64-encoded ASCII bytes written to ostream. Calling close on the Base64EncodePipe stream is necessary to complete the encoding (but does not close ostream).

Examples

julia> io = IOBuffer();

julia> iob64_encode = Base64EncodePipe(io);

julia> write(iob64_encode, "Hello!")
6

julia> close(iob64_encode);

julia> str = String(take!(io))
"SGVsbG8h"

julia> String(base64decode(str))
"Hello!"

base64encode(writefunc, args...; context=nothing)
base64encode(args...; context=nothing)

Given a write-like function writefunc, which takes an I/O stream as its first argument, base64encode(writefunc, args...) calls writefunc to write args... to a base64-encoded string, and returns the string. base64encode(args...) is equivalent to base64encode(write, args...): it converts its arguments into bytes using the standard write functions and returns the base64-encoded string.

The optional keyword argument context can be set to :key=>value pair or an IO or IOContext object whose attributes are used for the I/O stream passed to writefunc or write.

See also base64decode.

Base64DecodePipe(istream)

Return a new read-only I/O stream, which decodes base64-encoded data read from istream.

Examples

julia> io = IOBuffer();

julia> iob64_decode = Base64DecodePipe(io);

julia> write(io, "SGVsbG8h")
8

julia> seekstart(io);

julia> String(read(iob64_decode))
"Hello!"

base64decode(string)

Decode the base64-encoded string and returns a Vector{UInt8} of the decoded bytes.

See also base64encode.

Examples

julia> b = base64decode("SGVsbG8h")
6-element Vector{UInt8}:
 0x48
 0x65
 0x6c
 0x6c
 0x6f
 0x21

julia> String(b)
"Hello!"

stringmime(mime, x; context=nothing)

Return an AbstractString containing the representation of x in the requested mime type. This is similar to repr(mime, x) except that binary data is base64-encoded as an ASCII string.

The optional keyword argument context can be set to :key=>value pair or an IO or IOContext object whose attributes are used for the I/O stream passed to show.