hare

commit b8499183ddef9e9170ba4bb8e5c60b60531b5f3f
parent 78bedb21079c4c51939de6ee60adb4983ffb8ff1
Author: Drew DeVault <sir@cmpwn.com>
Date:   Fri, 26 Feb 2021 14:59:58 -0500

encoding::hex: new module

Diffstat:
A
encoding/hex/hex.ha
 | 
25
+++++++++++++++++++++++++

1 file changed, 25 insertions(+), 0 deletions(-)
diff --git a/encoding/hex/hex.ha b/encoding/hex/hex.ha
@@ -0,0 +1,25 @@
+use io;
+use strconv;
+use strings;
+use strio;
+
+// Encodes a byte slice to hex and writes it to a string. The caller must free
+// this string.
+export fn encode(b: []u8) str = {
+	let buf = strio::dynamic();
+	for (let i = 0z; i < len(b); i += 1) {
+		let s = strconv::u8tosb(b[i], strconv::base::HEX_LOWER);
+		if (len(s) == 1) {
+			io::write(buf, ['0': u32: u8]);
+		};
+		io::write(buf, strings::to_utf8(s)) as size;
+	};
+	return strio::finish(buf);
+};
+
+@test fn encode() void = {
+	let in: [_]u8 = [0xCA, 0xFE, 0xBA, 0xBE, 0xDE, 0xAD, 0xF0, 0x0D];
+	let s = encode(in);
+	defer free(s);
+	assert(s == "cafebabedeadf00d");
+};