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4a3323b83d
There is no offcial reverse table for base64, so a short program is required to generate one.
71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
/*
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* base64rev generator
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*
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* Copyright 2009-2010 Krzysztof Piotr Oledzki <ole@ans.pl>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <stdio.h>
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const char base64tab[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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char base64rev[128];
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#define base '#' /* arbitrary chosen base value */
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#define B64MAX 64
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#define B64PADV B64MAX
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int main() {
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char *p, c;
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int i, min = 255, max = 0;
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for (i = 0; i < sizeof(base64rev); i++)
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base64rev[i] = base;
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for (i = 0; i < B64MAX; i++) {
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c = base64tab[i];
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if (min > c)
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min = c;
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if (max < c)
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max = c;
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}
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for (i = 0; i < B64MAX; i++) {
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c = base64tab[i];
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if (base+i+1 > 127) {
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printf("Wrong base value @%d\n", i);
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return 1;
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}
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base64rev[c - min] = base+i+1;
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}
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base64rev['=' - min] = base + B64PADV;
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base64rev[max - min + 1] = '\0';
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printf("#define B64BASE '%c'\n", base);
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printf("#define B64CMIN '%c'\n", min);
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printf("#define B64CMAX '%c'\n", max);
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printf("#define B64PADV %u\n", B64PADV);
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p = base64rev;
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printf("const char base64rev[]=\"");
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for (p = base64rev; *p; p++) {
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if (*p == '\\')
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printf("\\%c", *p);
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else
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printf("%c", *p);
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}
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printf("\"\n");
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return 0;
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}
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