delim $$ .EN dec64, enc64, dec32, enc32, dec16, enc16, encodefmt - encoding byte arrays as strings #include <u.h>

#include <libc.h>

int dec64(uchar *out, int lim, char *in, int n)

int enc64(char *out, int lim, uchar *in, int n)

int dec32(uchar *out, int lim, char *in, int n)

int enc32(char *out, int lim, uchar *in, int n)

int dec16(uchar *out, int lim, char *in, int n)

int enc16(char *out, int lim, uchar *in, int n)

int encodefmt(Fmt*)

Enc16 , enc32 and enc64 create null terminated strings. They return the size of the encoded string (without the null) or -1 if the encoding fails. The encoding fails if lim , the length of the output buffer, is too small. They require $2 n + 1$, ${ 8 n + 4 } over 5 + 1$ and $4 { { n + 2 } over 3 } + 1$ bytes, respectively.

Dec16 , dec32 and dec64 return the number of bytes decoded or -1 if the decoding fails. The decoding fails if the output buffer is not large enough or, for base 32, if the input buffer length is not a multiple of 8.

Encodefmt can be used with fmtinstall (2) and print (2) to print encoded representations of byte arrays. The verbs are

3 H base 16 (i.e. hexadecimal). The default encoding is in upper case. The l flag forces lower case.

< base 32

[ base 64 (same as MIME)

The length of the array is specified as f2 . For example, to display a 15 byte array as hex:

.EX char x[15]; fmtinstall('H', encodefmt); print("%.*H\\n", sizeof x, x); /sys/src/libc/port/u[136][246].c