51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/****************************************************************************
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* Function to encode in Base64
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*
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* Written by Lauri Alanko
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*
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*****************************************************************************/
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#include "common.h"
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#include "base64.h"
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char *
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base64 (const char *bin, size_t len)
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{
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char *buf = (char *) malloc ((len + 2) / 3 * 4 + 1);
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size_t i = 0, j = 0;
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char BASE64_END = '=';
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char base64_table[64];
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strncpy (base64_table, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", 64);
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while (j < len - 2) {
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buf[i++] = base64_table[bin[j] >> 2];
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buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
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buf[i++] = base64_table[((bin[j + 1] & 15) << 2) | (bin[j + 2] >> 6)];
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buf[i++] = base64_table[bin[j + 2] & 63];
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j += 3;
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}
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switch (len - j) {
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case 1:
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buf[i++] = base64_table[bin[j] >> 2];
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buf[i++] = base64_table[(bin[j] & 3) << 4];
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buf[i++] = BASE64_END;
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buf[i++] = BASE64_END;
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break;
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case 2:
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buf[i++] = base64_table[bin[j] >> 2];
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buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
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buf[i++] = base64_table[(bin[j + 1] & 15) << 2];
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buf[i++] = BASE64_END;
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break;
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case 0:
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break;
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}
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buf[i] = '\0';
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return buf;
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}
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