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#include "base32decode.h"
static const unsigned char base32values[128] = {
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,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0x0a, 0x0b, 0x0c, 0xff, 0x0d, 0x0e,
0x0f, 0xff, 0x10, 0x11, 0x12, 0x13, 0x14, 0xff,
0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c,
0x1d, 0x1e, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0x0a, 0x0b, 0x0c, 0xff, 0x0d, 0x0e,
0x0f, 0xff, 0x10, 0x11, 0x12, 0x13, 0x14, 0xff,
0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c,
0x1d, 0x1e, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff
};
int base32decode(unsigned char *out, long long outlen, const unsigned char *in, long long inlen) {
long long i, j = 0;
unsigned char u;
unsigned long long v = 0, vbits = 0;
for (i = 0; i < inlen; ++i) {
if (in[j] & 0x80) return 0;
u = base32values[in[i]];
if (u > 0x1f) return 0;
v |= u << vbits;
vbits += 5;
if (vbits >= 8) {
if (j >= outlen) return 0;
out[j++] = v;
vbits -= 8;
v >>= 8;
}
}
if (vbits) {
if (j >= outlen) return 0;
out[j++] = v;
}
return 1;
}
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