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test and README tiny updates

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Motiejus Jakštys
2022-02-18 17:24:22 +02:00
committed by Motiejus Jakštys
parent 80ec63b6a4
commit 411fb91fd1
2 changed files with 41 additions and 36 deletions
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34
src/header.zig
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@@ -8,7 +8,7 @@ const Bom = 0x1234;
pub const SectionLength = 64;
const HeaderError = error{
const InvalidHeader = error{
InvalidMagic,
InvalidVersion,
InvalidBom,
@@ -23,16 +23,16 @@ const Header = packed struct {
num_shells: u8,
num_users: u32,
num_groups: u32,
offset_cmph_uid2user: u32,
offset_cmph_groupname2group: u32,
offset_cmph_username2user: u32,
offset_bdz_uid2user: u32,
offset_bdz_groupname2group: u32,
offset_bdz_username2user: u32,
offset_idx: u32,
offset_groups: u32,
offset_users: u32,
offset_groupmembers: u32,
offset_additional_gids: u32,
pub fn init(blob: [HeaderSize]u8) HeaderError!Header {
pub fn init(blob: [HeaderSize]u8) InvalidHeader!Header {
const self = @bitCast(Header, blob);
for (Magic) |item, index| {
if (self.magic[index] != item) return error.InvalidMagic;
@@ -48,9 +48,9 @@ const Header = packed struct {
}
const offsets = [_]u32{
self.offset_cmph_uid2user,
self.offset_cmph_groupname2group,
self.offset_cmph_username2user,
self.offset_bdz_uid2user,
self.offset_bdz_groupname2group,
self.offset_bdz_username2user,
self.offset_idx,
self.offset_groups,
self.offset_users,
@@ -73,12 +73,15 @@ const Header = packed struct {
const testing = std.testing;
test "constants and types are reasonable" {
test "header is byte-aligned" {
try testing.expectEqual(HeaderSize * 8, @bitSizeOf(Header));
}
test "Section length is a power of two" {
try testing.expect(std.math.isPowerOfTwo(SectionLength));
}
test "header pack and unpack" {
test "header pack, unpack and validation" {
const goodHeader = Header{
.magic = Magic,
.version = Version,
@@ -86,9 +89,9 @@ test "header pack and unpack" {
.num_shells = 0,
.num_users = 0,
.num_groups = 0,
.offset_cmph_uid2user = 0,
.offset_cmph_groupname2group = 0,
.offset_cmph_username2user = 0,
.offset_bdz_uid2user = 0,
.offset_bdz_groupname2group = 0,
.offset_bdz_username2user = 0,
.offset_idx = 0,
.offset_groups = 0,
.offset_users = 0,
@@ -96,8 +99,7 @@ test "header pack and unpack" {
.offset_additional_gids = 0,
};
const blob = goodHeader.asArray();
const gotHeader = try Header.init(blob);
const gotHeader = try Header.init(goodHeader.asArray());
try testing.expectEqual(goodHeader, gotHeader);
{
@@ -120,7 +122,7 @@ test "header pack and unpack" {
{
var header = goodHeader;
header.offset_cmph_uid2user = 65;
header.offset_bdz_uid2user = 65;
try testing.expectError(error.InvalidOffset, Header.init(header.asArray()));
}
}