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