86 lines
1.5 KiB
Text
86 lines
1.5 KiB
Text
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.TH ENCODE 2
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.SH NAME
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dec64, enc64, dec32, enc32, dec16, enc16, encodefmt \- encoding byte arrays as strings
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.SH SYNOPSIS
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.B #include <u.h>
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.br
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.B #include <libc.h>
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.PP
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.B
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int dec64(uchar *out, int lim, char *in, int n)
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.PP
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.B
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int enc64(char *out, int lim, uchar *in, int n)
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.PP
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.B
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int dec32(uchar *out, int lim, char *in, int n)
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.PP
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.B
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int enc32(char *out, int lim, uchar *in, int n)
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.PP
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.B
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int dec16(uchar *out, int lim, char *in, int n)
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.PP
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.B
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int enc16(char *out, int lim, uchar *in, int n)
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.PP
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.B
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int encodefmt(Fmt*)
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.SH DESCRIPTION
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.PP
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.IR Enc16 ,
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.I enc32
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and
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.I enc64
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create null terminated strings. They return the size of the
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encoded string (without the null) or -1 if the encoding fails.
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The encoding fails if
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.IR lim ,
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the length of the output buffer, is too small.
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.PP
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.IR Dec16 ,
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.I dec32
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and
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.I dec64
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return the number of bytes decoded or -1 if the decoding fails.
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The decoding fails if the output buffer is not large enough or,
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for base 32, if the input buffer length is not a multiple
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of 8.
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.PP
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.I Encodefmt
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can be used with
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.IR fmtinstall (2)
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and
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.IR print (2)
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to print encoded representations of byte arrays.
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The verbs are
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.TP
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.B H
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base 16 (i.e. hexadecimal). The default encoding is
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in upper case. The
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.B l
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flag forces lower case.
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.TP
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.B <
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base 32
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.TP
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.B [
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base 64 (same as MIME)
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.PD
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.PP
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The length of the array is specified as
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.IR f2 .
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For example, to display a 15 byte array as hex:
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.EX
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char x[15];
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fmtinstall('H', encodefmt);
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print("%.*H\\n", sizeof x, x);
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.EE
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.SH SOURCE
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.B /sys/src/libc/port/u32.c
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.br
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.B /sys/src/libc/port/u64.c
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