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.
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);
/src/lib9/u32.c
/src/lib9/u64.c