The source contains binary data (i.e. an
octed stream).
iso_latin_1
The source contains text in ISO Latin-1 format.
utf8
The source contains UCS/UNICODE characters encoded using the multibyte
UTF-8 encoding.
unicode_le,unicode_be
The source contains 16-but UNICODE-2 characters in little- or big endian
encoding
wchar
The source contains a sequence of wchar_t objects. This internally
format is implementation defined, both in terms of the number of bytes
per character as the byte-order.