add header command

1 files changed, 37 insertions, 0 deletions

diff --git a/header/header.ha b/header/header.ha
new file mode 100644
index 0000000..9602071
--- /dev/null
+++ b/header/header.ha
@@ -0,0 +1,37 @@
+use fmt;
+use io;
+
+use gpt;
+
+export fn header(vol: io::file, args: []str) void = {
+	const vol = match (gpt::from(vol)) {
+	case let g: *gpt::gpt =>
+		yield g;
+	case gpt::nogpt =>
+		fmt::fatalf("gpt.header: disk {} does not have valid gpt", args[0]);
+	case =>
+		fmt::fatalf("gpt.header: could not access disk {}", args[0]);
+	};
+	defer gpt::finish(vol);
+
+	const header = vol.primary.header;
+
+	fmt::printfln("revision: \t\t{}", header.revision)!;
+	fmt::printfln("header_size: \t\t{}", header.header_size)!;
+	fmt::printfln("header_crc32: \t\t{}", header.header_crc32)!;
+	fmt::printfln("header_lba: \t\t{}", header.header_lba)!;
+	fmt::printfln("backup_header_lba: \t{}", header.backup_header_lba)!;
+	fmt::printfln("first_lba: \t\t{}", header.first_lba)!;
+	fmt::printfln("last_lba: \t\t{}", header.last_lba)!;
+	fmt::printfln("disk_guid: \t\t[{},{}]", header.disk_guid[0], header.disk_guid[1])!;
+	fmt::printfln("entries_lba: \t\t{}", header.entries_lba)!;
+	fmt::printfln("entries_len: \t\t{}", header.entries_len)!;
+	fmt::printfln("entry_size: \t\t{}", header.entry_size)!;
+	fmt::printfln("entries_crc32: \t\t{}", header.entries_crc32)!;
+	
+	const primary_valid = gpt::header_crc32(header) == header.header_crc32 && gpt::entries_crc32(vol.primary.entries) == header.entries_crc32;
+	const backup_valid = gpt::header_crc32(vol.backup.header) == vol.backup.header.header_crc32 && gpt::entries_crc32(vol.backup.entries) == vol.backup.header.entries_crc32;
+
+	fmt::printfln("primary_sane: \t\t{}", primary_valid)!;
+	fmt::printfln("backup_sane: \t\t{}", backup_valid)!;
+};