#include <u.h>#include <libc.h> #define between(x,min,max) (((min-1-x) & (x-max-1))>>8) intenc16chr(int o){ int c; c = between(o, 0, 9) & ('0'+o); c |= between(o, 10, 15) & ('A'+(o-10)); return c;} intdec16chr(int c){ int o; o = between(c, '0', '9') & (1+(c-'0')); o |= between(c, 'A', 'F') & (1+10+(c-'A')); o |= between(c, 'a', 'f') & (1+10+(c-'a')); return o-1;} intdec16(uchar *out, int lim, char *in, int n){ int c, w = 0, i = 0; uchar *start = out; uchar *eout = out + lim; while(n-- > 0){ c = dec16chr(*in++); if(c < 0) continue; w = (w<<4) + c; i++; if(i == 2){ if(out + 1 > eout) goto exhausted; *out++ = w; w = 0; i = 0; } }exhausted: return out - start;} intenc16(char *out, int lim, uchar *in, int n){ uint c; char *eout = out + lim; char *start = out; while(n-- > 0){ c = *in++; if(out + 2 >= eout) goto exhausted; *out++ = enc16chr(c>>4); *out++ = enc16chr(c&15); }exhausted: *out = 0; return out - start;}
#include <u.h>
#include <libc.h>
#define between(x,min,max) (((min-1-x) & (x-max-1))>>8)
int
enc16chr(int o)
{
int c;
c = between(o, 0, 9) & ('0'+o);
c |= between(o, 10, 15) & ('A'+(o-10));
return c;
}
int
dec16chr(int c)
{
int o;
o = between(c, '0', '9') & (1+(c-'0'));
o |= between(c, 'A', 'F') & (1+10+(c-'A'));
o |= between(c, 'a', 'f') & (1+10+(c-'a'));
return o-1;
}
int
dec16(uchar *out, int lim, char *in, int n)
{
int c, w = 0, i = 0;
uchar *start = out;
uchar *eout = out + lim;
while(n-- > 0){
c = dec16chr(*in++);
if(c < 0)
continue;
w = (w<<4) + c;
i++;
if(i == 2){
if(out + 1 > eout)
goto exhausted;
*out++ = w;
w = 0;
i = 0;
}
}
exhausted:
return out - start;
}
int
enc16(char *out, int lim, uchar *in, int n)
{
uint c;
char *eout = out + lim;
char *start = out;
while(n-- > 0){
c = *in++;
if(out + 2 >= eout)
goto exhausted;
*out++ = enc16chr(c>>4);
*out++ = enc16chr(c&15);
}
exhausted:
*out = 0;
return out - start;
}