55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Based on libavutil/base64.c
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*/
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#include <stdio.h>
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int main(void)
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{
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static const char b64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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unsigned i_bits = 0;
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int i_shift = 0;
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int out_len = 0;
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int in;
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#define putb64() \
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do { \
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putchar(b64[(i_bits << 6 >> i_shift) & 0x3f]); \
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out_len++; \
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i_shift -= 6; \
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} while (0)
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while ((in = getchar()) != EOF) {
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i_bits = (i_bits << 8) + in;
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i_shift += 8;
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while (i_shift > 6)
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putb64();
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}
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while (i_shift > 0)
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putb64();
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while (out_len++ & 3)
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putchar('=');
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putchar('\n');
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return 0;
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}
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