94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include "types.h"
|
|
#include "base64.h"
|
|
|
|
static const u8 base64f[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, 0x3E, 0xFF, 0xFF, 0xFF, 0x3F, // 0x28
|
|
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, // 0x30
|
|
0x3C, 0x3D, 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, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, // 0x60
|
|
0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, // 0x68
|
|
0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, // 0x70
|
|
0x31, 0x32, 0x33, 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,
|
|
};
|
|
|
|
size_t base64_from(u8 *dst,const char *src,size_t srclen)
|
|
{
|
|
if (srclen % 4) {
|
|
return -1;
|
|
} else if (!srclen) {
|
|
return 0;
|
|
}
|
|
|
|
size_t dstlen = BASE64_FROM_LEN(srclen);
|
|
dstlen -= (src[srclen - 1] == '=');
|
|
dstlen -= (src[srclen - 2] == '=');
|
|
|
|
for (size_t i = 0, j = 0; i < srclen;) {
|
|
u32 sixbits[4];
|
|
|
|
sixbits[0] = base64f[(unsigned char)src[i++]];
|
|
sixbits[1] = base64f[(unsigned char)src[i++]];
|
|
sixbits[2] = (src[i] == '=' ? (0 & i++) : base64f[(unsigned char)src[i++]]);
|
|
sixbits[3] = (src[i] == '=' ? (0 & i++) : base64f[(unsigned char)src[i++]]);
|
|
|
|
u32 threebytes = 0
|
|
| (sixbits[0] << (3 * 6))
|
|
| (sixbits[1] << (2 * 6))
|
|
| (sixbits[2] << (1 * 6))
|
|
| (sixbits[3] << (0 * 6));
|
|
|
|
if (j < dstlen) dst[j++] = (threebytes >> (2 * 8));
|
|
if (j < dstlen) dst[j++] = (threebytes >> (1 * 8)) & 0xff;
|
|
if (j < dstlen) dst[j++] = (threebytes >> (0 * 8)) & 0xff;
|
|
}
|
|
return dstlen;
|
|
}
|
|
|
|
int base64_valid(const char *src,size_t *count)
|
|
{
|
|
const char *p;
|
|
|
|
for (p = src;base64f[(u8)*p] != 0xFF;++p)
|
|
;
|
|
|
|
for (;((size_t) (p - src)) % 4 != 0 && *p == '=';++p)
|
|
;
|
|
|
|
if (count)
|
|
*count = (size_t) (p - src);
|
|
return !*p && ((size_t) (p - src)) % 4 == 0;
|
|
}
|