1 files changed, 27 insertions, 0 deletions

diff --git a/src/ot_hex.h b/src/ot_hex.h
new file mode 100644
index 0000000..ddbbb44
--- /dev/null
+++ b/src/ot_hex.h
@@ -0,0 +1,27 @@
+/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
+   It is considered beerware. Prost. Skol. Cheers or whatever. */
+
+#ifndef OT_HEX_H__
+#define OT_HEX_H__
+
+#include <stdint.h>
+
+#include "trackerlogic.h"
+
+/* Write hash as forty upper case hex digits followed by a terminating zero.
+   dest must have room for forty one bytes. Returns dest. */
+char *hex_from_hash(char *dest, const uint8_t *hash);
+
+/* Read forty hex digits from src into hash. Returns non-zero on success.
+   On failure hash is left untouched and no byte of src beyond the offending
+   character is read, so src need not be forty characters long. */
+int   hex_to_hash(ot_hash hash, const char *src);
+
+/* Non-zero if c is a hexadecimal digit, in either case. */
+int   hex_isdigit(int c);
+
+/* The value of a hexadecimal digit, or -1 if c is not one. Shared with the
+   address scanner so that both agree on what a digit is. */
+int   hex_value(int c);
+
+#endif