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cathugger 2017-09-24 22:13:16 +03:00
commit 9b80e8676c
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#include <stddef.h>
#include <stdint.h>
#include "types.h"
#include "base16.h"
static const u8 base16f[256] = {
['0'] = 0, ['1'] = 1, ['2'] = 2, ['3'] = 3,
['4'] = 4, ['5'] = 5, ['6'] = 6, ['7'] = 7,
['8'] = 8, ['9'] = 9, ['A'] = 10, ['B'] = 11,
['C'] = 12, ['D'] = 13, ['E'] = 14, ['F'] = 15,
['a'] = 10, ['b'] = 11,
['c'] = 12, ['d'] = 13, ['e'] = 14, ['f'] = 15,
};
size_t base16_from(u8 *dst, u8 *dmask, const char *src)
{
int i, j, k = -1, l;
u8 mask = 0;
for (i = 0;;i += 4) {
j = i/4;
l = i%8;
if (!src[j]) {
if (!l)
mask = 0xFF;
if (k >= 0)
dst[k] &= mask;
*dmask = mask;
return (size_t)(k+1);
}
k = i/8;
mask = (0x0F << 4) >> l;
dst[k] &= ~mask;
dst[k] |= (base16f[(u8)src[j]] << 4) >> l;
}
}