MIME encoding

	MIME defines a number of encodings that serve to represent
	8-bit data in 7 bits. For the meaning of the encodings, see
	elsewhere. [[MIME_8bit]] and [[MIME_7bit]] essentially means
	`no encoding'. The default is [[MIME_8bit]]. The function
	[[lookup_encoding()]] translates a string to the
	[[MIME_encoding]] enumerated type.

<<*>>=
#include <config.h>
#include <str.h>

EXPORT typedef enum {
    MIME_8bit, MIME_7bit, MIME_quoted_printable, MIME_base64, MIME_x_gzip,
} MIME_encoding;

EXPORT MIME_encoding lookup_encoding(char *s)
{
    if (case_eq(s, "7bit")) return MIME_7bit;
    if (case_eq(s, "8bit")) return MIME_8bit;
    if (case_eq(s, "quoted-printable")) return MIME_quoted_printable;
    if (case_eq(s, "base64")) return MIME_base64;
    if (case_eq(s, "x-gzip")) return MIME_x_gzip;
    return MIME_8bit;
}