54 lines
823 B
C
54 lines
823 B
C
#include <u.h>
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#include <libc.h>
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static char t16e[] = "0123456789ABCDEF";
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int
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dec16(uchar *out, int lim, char *in, int n)
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{
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int c, w = 0, i = 0;
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uchar *start = out;
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uchar *eout = out + lim;
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while(n-- > 0){
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c = *in++;
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if('0' <= c && c <= '9')
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c = c - '0';
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else if('a' <= c && c <= 'z')
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c = c - 'a' + 10;
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else if('A' <= c && c <= 'Z')
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c = c - 'A' + 10;
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else
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continue;
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w = (w<<4) + c;
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i++;
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if(i == 2){
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if(out + 1 > eout)
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goto exhausted;
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*out++ = w;
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w = 0;
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i = 0;
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}
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}
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exhausted:
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return out - start;
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}
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int
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enc16(char *out, int lim, uchar *in, int n)
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{
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uint c;
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char *eout = out + lim;
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char *start = out;
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while(n-- > 0){
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c = *in++;
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if(out + 2 >= eout)
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goto exhausted;
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*out++ = t16e[c>>4];
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*out++ = t16e[c&0xf];
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}
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exhausted:
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*out = 0;
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return out - start;
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}
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