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-rw-r--r--src/misc/a64l.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/src/misc/a64l.c b/src/misc/a64l.c
new file mode 100644
index 00000000..86aeefe0
--- /dev/null
+++ b/src/misc/a64l.c
@@ -0,0 +1,26 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+static const char digits[] =
+ "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+long a64l(const char *s)
+{
+ int e;
+ uint32_t x = 0;
+ for (e=0; e<36 && *s; e+=6, s++)
+ x |= (strchr(digits, *s)-digits)<<e;
+ return x;
+}
+
+char *l64a(long x0)
+{
+ static char s[7];
+ char *p;
+ uint32_t x = x0;
+ for (p=s; x; p++, x>>=6)
+ *p = digits[x&63];
+ *p = 0;
+ return s;
+}