From 12577f3445df86023ba0cbe2462d55ea5dcafe20 Mon Sep 17 00:00:00 2001
From: Alejandro Sior <aho@sior.be>
Date: Fri, 17 Jun 2022 14:43:27 +0200
Subject: gptman: now can allocate partitions

---
 gpt/crc32.ha | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'gpt/crc32.ha')

diff --git a/gpt/crc32.ha b/gpt/crc32.ha
index 24318bd..386779f 100644
--- a/gpt/crc32.ha
+++ b/gpt/crc32.ha
@@ -79,3 +79,19 @@ export fn header_crc32(self: *header) u32 = {
 	crc ^= 0xffffffff;
 	return crc;
 };
+
+// Calculates the crc32 entries array checksum
+export fn entries_crc32(self: *[128]entry) u32 = {
+	const data = self: *[*]u8;
+
+	let crc: u32 = 0xffffffff;
+	for (let i = 0z; i < 128*128; i += 1) {
+		let d: u8 = data[i];
+
+		let lookup_index: u32 = (crc ^ d) & 0xff;
+		crc = (crc >> 8) ^ crc_table[lookup_index];
+	};
+
+	crc ^= 0xffffffff;
+	return crc;
+};
-- 
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