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ffmpeg / tests / base64.c @ d370e3e9

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1 ce3a841d Måns Rullgård
/*
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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() 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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}