Pull the json-hex-encoding from shortsum to jsonutil

1 files changed, 42 insertions, 0 deletions

diff --git a/lib/jsonutil/hex_string.go b/lib/jsonutil/hex_string.go
new file mode 100644
index 0000000..06970ce
--- /dev/null
+++ b/lib/jsonutil/hex_string.go
@@ -0,0 +1,42 @@
+// Copyright (C) 2023  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+// Package jsonutil provides utilities for implementing the interfaces
+// consumed by the "git.lukeshu.com/go/lowmemjson" package.
+package jsonutil
+
+import (
+	"io"
+
+	"git.lukeshu.com/go/lowmemjson"
+)
+
+func EncodeHexString[T ~[]byte | ~string](w io.Writer, str T) error {
+	const hextable = "0123456789abcdef"
+	var buf [2]byte
+	buf[0] = '"'
+	if _, err := w.Write(buf[:1]); err != nil {
+		return err
+	}
+	for i := 0; i < len(str); i++ {
+		buf[0] = hextable[str[i]>>4]
+		buf[1] = hextable[str[i]&0x0f]
+		if _, err := w.Write(buf[:]); err != nil {
+			return err
+		}
+	}
+	buf[0] = '"'
+	if _, err := w.Write(buf[:1]); err != nil {
+		return err
+	}
+	return nil
+}
+
+func DecodeHexString(r io.RuneScanner, dst io.ByteWriter) error {
+	dec := &hexDecoder{dst: dst}
+	if err := lowmemjson.DecodeString(r, dec); err != nil {
+		return err
+	}
+	return dec.Close()
+}