ENCODE(2)ENCODE(2)

NAME

dec64, enc64, dec32, enc32, dec16, enc16, encodefmt – encoding byte arrays as strings

SYNOPSIS

#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*)

DESCRIPTION

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 (including null), is too small.

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

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:


    char x[15];

    fmtinstall('H', encodefmt);
    print("%.*H\\n", sizeof x, x);

SOURCE

/sys/src/libc/port/u32.c
/sys/src/libc/port/u64.c
/sys/src/libc/port/encodefmt.c