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