From 8e4ebbdfca16dacc2763e852afbdd94708186eb0 Mon Sep 17 00:00:00 2001
From: Runxi Yu <me@runxiyu.org>
Date: Fri, 14 Mar 2025 09:34:02 +0800
Subject: [PATCH] Add oid_from_str

---
 git/oid.ha | 25 +++++++++++++++++++++++++

diff --git a/git/oid.ha b/git/oid.ha
index 0e1688f70279d812307e1be3994c71d25578a45e..ae81198758a4674798778a5714f88755314ae2fb 100644
--- a/git/oid.ha
+++ b/git/oid.ha
@@ -1,6 +1,31 @@
 use crypto::sha1;
 use crypto::sha256;
+use encoding::hex;
+use io;
+
+// Invalid hash length
+export type hashlen = !void;
 
 export type oid = (oid_sha1 | oid_sha256);
 export type oid_sha1 = [sha1::SZ]u8;
 export type oid_sha256 = [sha256::SZ]u8;
+
+export fn oid_from_str(s: const str) (oid | io::error | hashlen) = {
+	const d = hex::decodestr(s)?;
+	defer free(d);
+
+	let o: oid = switch (len(s)) {
+	case sha1::SZ =>
+		let p: oid_sha1 = [0...];
+		p[..] = d[..];
+		yield p;
+	case sha256::SZ => 
+		let p: oid_sha256 = [0...];
+		p[..] = d[..];
+		yield p;
+	case =>
+		return hashlen;
+	};
+
+	return o;
+};

-- 
2.48.1