26 lines
795 B
C
26 lines
795 B
C
#include "base64.h"
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#include <stdint.h>
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#include <stddef.h>
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static const char b64_enc_table[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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int base64_encode(const uint8_t *in, size_t ilen, char *out)
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{
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size_t out_len = 0;
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for (size_t i = 0; i < ilen; i += 3) {
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uint32_t triple = 0;
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int remain = ilen - i;
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triple |= in[i] << 16;
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if (remain > 1) triple |= in[i + 1] << 8;
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if (remain > 2) triple |= in[i + 2];
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out[out_len++] = b64_enc_table[(triple >> 18) & 0x3F];
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out[out_len++] = b64_enc_table[(triple >> 12) & 0x3F];
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out[out_len++] = (remain > 1) ? b64_enc_table[(triple >> 6) & 0x3F] : '=';
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out[out_len++] = (remain > 2) ? b64_enc_table[triple & 0x3F] : '=';
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}
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return 0;
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}
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