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-rw-r--r--enc/hex.go16
1 files changed, 16 insertions, 0 deletions
diff --git a/enc/hex.go b/enc/hex.go
new file mode 100644
index 0000000..0d19538
--- /dev/null
+++ b/enc/hex.go
@@ -0,0 +1,16 @@
+// Copyright © 2020 rsiddharth <s@ricketyspace.net>
+// SPDX-License-Identifier: ISC
+
+package enc
+
+// Adapted from
+// https://go.googlesource.com/go/+/refs/tags/go1.15/src/encoding/hex/hex.go#83
+func HexCharToDec(c byte) uint16 {
+ switch {
+ case '0' <= c && c <= '9':
+ return uint16(c - '0')
+ case 'a' <= c && c <= 'f':
+ return uint16(c - 'a' + 10)
+ }
+ return 0
+}