| ENCODE(3) | ENCODE(3)

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, 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`