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Man Pages


Manual Reference Pages  -  ENCODE (3)

NAME

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

CONTENTS

Synopsis
Description
Source

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, 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(3) and print(3) 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

/usr/local/plan9/src/lib9/u32.c
/usr/local/plan9/src/lib9/u64.c
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