86 lines
1.5 KiB
Plaintext
86 lines
1.5 KiB
Plaintext
|
.TH ENCODE 2
|
||
|
|
.SH NAME
|
||
|
|
dec64, enc64, dec32, enc32, dec16, enc16, encodefmt \- encoding byte arrays as strings
|
||
|
|
.SH SYNOPSIS
|
||
|
|
.B #include <u.h>
|
||
|
|
.br
|
||
|
|
.B #include <libc.h>
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
int dec64(uchar *out, int lim, char *in, int n)
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
int enc64(char *out, int lim, uchar *in, int n)
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
int dec32(uchar *out, int lim, char *in, int n)
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
int enc32(char *out, int lim, uchar *in, int n)
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
int dec16(uchar *out, int lim, char *in, int n)
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
int enc16(char *out, int lim, uchar *in, int n)
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
int encodefmt(Fmt*)
|
||
|
|
.SH DESCRIPTION
|
||
|
|
.PP
|
||
|
|
.IR Enc16 ,
|
||
|
|
.I enc32
|
||
|
|
and
|
||
|
|
.I 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
|
||
|
|
.IR lim ,
|
||
|
|
the length of the output buffer, is too small.
|
||
|
|
.PP
|
||
|
|
.IR Dec16 ,
|
||
|
|
.I dec32
|
||
|
|
and
|
||
|
|
.I 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.
|
||
|
|
.PP
|
||
|
|
.I Encodefmt
|
||
|
|
can be used with
|
||
|
|
.IR fmtinstall (2)
|
||
|
|
and
|
||
|
|
.IR print (2)
|
||
|
|
to print encoded representations of byte arrays.
|
||
|
|
The verbs are
|
||
|
|
.TP
|
||
|
|
.B H
|
||
|
|
base 16 (i.e. hexadecimal). The default encoding is
|
||
|
|
in upper case. The
|
||
|
|
.B l
|
||
|
|
flag forces lower case.
|
||
|
|
.TP
|
||
|
|
.B <
|
||
|
|
base 32
|
||
|
|
.TP
|
||
|
|
.B [
|
||
|
|
base 64 (same as MIME)
|
||
|
|
.PD
|
||
|
|
.PP
|
||
|
|
The length of the array is specified as
|
||
|
|
.IR f2 .
|
||
|
|
For example, to display a 15 byte array as hex:
|
||
|
|
.EX
|
||
|
|
|
||
|
|
char x[15];
|
||
|
|
|
||
|
|
fmtinstall('H', encodefmt);
|
||
|
|
print("%.*H\\n", sizeof x, x);
|
||
|
|
|
||
|
|
.EE
|
||
|
|
.SH SOURCE
|
||
|
|
.B /sys/src/libc/port/u32.c
|
||
|
|
.br
|
||
|
|
.B /sys/src/libc/port/u64.c
|