gptman: now can allocate partitions

1 files changed, 16 insertions, 0 deletions

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;
+};