Nils O. Selåsdal
44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
#include <stdint.h>
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#include <stdlib.h>
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#include "ucore/string.h"
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static const char basecode[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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#define PAD '='
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size_t
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uc_base64_enc(const unsigned char *data,size_t len,unsigned char *result)
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{
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size_t i = 0, j = 0;
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size_t pad;
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while (i < len) {
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pad = 3 - (len - i);
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switch(pad) {
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case 2:
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result[j] = basecode[data[i]>>2];
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result[j+1] = basecode[(data[i] & 0x03) << 4];
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result[j+2] = PAD;
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result[j+3] = PAD;
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break;
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case 3:
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result[j ] = basecode[data[i]>>2];
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result[j+1] = basecode[((data[i] & 0x03) << 4) | ((data[i+1] & 0xf0) >> 4)];
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result[j+2] = basecode[(data[i+1] & 0x0f) << 2];
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result[j+3] = PAD;
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break;
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default:
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result[j ] = basecode[data[i]>>2];
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result[j+1] = basecode[((data[i] & 0x03) << 4) | ((data[i+1] & 0xf0) >> 4)];
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result[j+2] = basecode[((data[i+1] & 0x0f) << 2) | ((data[i+2] & 0xc0) >> 6)];
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result[j+3] = basecode[data[i+2] & 0x3f];
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break;
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}
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j += 4;
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i += 3;
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}
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return j;
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}
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