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NAME
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dec64, enc64, dec32, enc32, dec16, enc16, encodefmt – encoding
byte arrays as strings
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SYNOPSIS
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#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*)
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DESCRIPTION
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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:
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char x[15];
fmtinstall('H', encodefmt);
print("%.*H\n", sizeof x, x);
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SOURCE
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