[CONTRIB] add base64rev-gen.c that was used to generate the base64rev table.
There is no offcial reverse table for base64, so a short
program is required to generate one.
diff --git a/contrib/base64/base64rev-gen.c b/contrib/base64/base64rev-gen.c
new file mode 100644
index 0000000..faffc87
--- /dev/null
+++ b/contrib/base64/base64rev-gen.c
@@ -0,0 +1,70 @@
+/*
+ * base64rev generator
+ *
+ * Copyright 2009-2010 Krzysztof Piotr Oledzki <ole@ans.pl>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <stdio.h>
+
+const char base64tab[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+char base64rev[128];
+
+#define base '#' /* arbitrary chosen base value */
+#define B64MAX 64
+#define B64PADV B64MAX
+
+int main() {
+ char *p, c;
+ int i, min = 255, max = 0;
+
+ for (i = 0; i < sizeof(base64rev); i++)
+ base64rev[i] = base;
+
+ for (i = 0; i < B64MAX; i++) {
+ c = base64tab[i];
+
+ if (min > c)
+ min = c;
+
+ if (max < c)
+ max = c;
+ }
+
+ for (i = 0; i < B64MAX; i++) {
+ c = base64tab[i];
+
+ if (base+i+1 > 127) {
+ printf("Wrong base value @%d\n", i);
+ return 1;
+ }
+
+ base64rev[c - min] = base+i+1;
+ }
+
+ base64rev['=' - min] = base + B64PADV;
+
+ base64rev[max - min + 1] = '\0';
+
+ printf("#define B64BASE '%c'\n", base);
+ printf("#define B64CMIN '%c'\n", min);
+ printf("#define B64CMAX '%c'\n", max);
+ printf("#define B64PADV %u\n", B64PADV);
+
+ p = base64rev;
+ printf("const char base64rev[]=\"");
+ for (p = base64rev; *p; p++) {
+ if (*p == '\\')
+ printf("\\%c", *p);
+ else
+ printf("%c", *p);
+ }
+ printf("\"\n");
+
+ return 0;
+}