aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Based on libavutil/base64.c
*/
#include <stdio.h>
int main(void)
{
static const char b64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
unsigned i_bits = 0;
int i_shift = 0;
int out_len = 0;
int in;
#define putb64() \
do { \
putchar(b64[(i_bits << 6 >> i_shift) & 0x3f]); \
out_len++; \
i_shift -= 6; \
} while (0)
while ((in = getchar()) != EOF) {
i_bits = (i_bits << 8) + in;
i_shift += 8;
while (i_shift > 6)
putb64();
}
while (i_shift > 0)
putb64();
while (out_len++ & 3)
putchar('=');
putchar('\n');
return 0;
}
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