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base32_from.c
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base32_from.c
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#include <stddef.h>
#include <stdint.h>
#include "types.h"
#include "base32.h"
static const u8 base32f[256] = {
//00 01 02 03 04 05 06 07
//08 09 0A 0B 0C 0D 0E 0F
// 0x00..0x3F
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 0x00
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 0x08
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 0x10
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 0x18
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 0x20
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 0x28
0xFF, 0xFF, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, // 0x30
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 0x38
// 0x40..0x7F
0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, // 0x40
0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, // 0x48
0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, // 0x50
0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 0x58
0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, // 0x60
0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, // 0x68
0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, // 0x70
0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 0x78
// 0x80..0xBF
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
// 0xC0..0xFF
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
};
/*
+--first octet--+-second octet--+--third octet--+--forth octet--+--fifth octet--+
|7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|
+---------+-----+---+---------+-+-------+-------+-+---------+---+-----+---------+
|4 3 2 1 0|4 3 2 1 0|4 3 2 1 0|4 3 2 1 0|4 3 2 1 0|4 3 2 1 0|4 3 2 1 0|4 3 2 1 0|
+-1.index-+-2.index-+-3.index-+-4.index-+-5.index-+-6.index-+-7.index-+-8.index-+
*/
size_t base32_from(u8 *dst,u8 *dmask,const char *src)
{
size_t i, j, k = (size_t)-1, l, sk = 0;
u8 mask = 0, cmask = 0;
for (i = 0;;i += 5) {
j = i/5;
if (!src[j]) {
if (k != (size_t)-1)
dst[k] &= cmask;
if (dmask)
*dmask = cmask;
return k + 1;
}
l = i%8;
k = i/8;
if (k != sk)
cmask = 0;
sk = k;
mask = (0x1F << 3) >> l;
cmask |= mask;
//printf("1:m[%02X] cm[%02X]\n",mask,cmask);
dst[k] &= ~mask;
dst[k] |= (base32f[(u8)src[j]] << 3) >> l;
if (((0x1F << 8) >> (l+5-8)) & 0xFF) {
++k;
sk = k;
mask = ((0x1F << 8) >> (l+5-8)) & 0xFF;
cmask = mask;
//printf("2:m[%02X] cm[%02X]\n",mask,cmask);
dst[k] &= ~mask;
dst[k] |= ((base32f[(u8)src[j]] << 8) >> (l+5-8)) & 0xFF;
}
//printf("i = %02d, i/8 = %02d, i%8 = %02d, i%8+5-8 = %02d\n", i, i/8, i%8, i%8+5-8);
//printf("mask0: %02x\n", (0x1F << 3) >> (i%8));
//printf("mask1: %02x\n", ((0x1F << 8) >> (i%8+5-8)) & 0xFF);
}
}
int base32_valid(const char *src,size_t *count)
{
const char *p;
for (p = src;base32f[(u8)*p] != 0xFF;++p)
;
if (count)
*count = (size_t) (p - src);
return !*p;
}