start packed group
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README.md
12
README.md
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@ -180,10 +180,10 @@ referred by their byte offset in the `Users` and `Groups` section relative to
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the beginning of the section.
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```
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const PackedGroup = struct {
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const PackedGroup = packed struct {
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gid: u32,
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// index to a separate structure with a list of members. The memberlist is
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// always 2^5-byte aligned (32b), this is an index there.
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// 2^5-byte aligned (32b), this is an index there.
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members_offset: u27,
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groupname_len: u5,
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// a groupname_len-sized string
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@ -347,10 +347,10 @@ Each section is padded to 64 bytes.
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```
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STATUS SECTION SIZE DESCRIPTION
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✅ Header 48 see "Turbonss header" section
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bdz_gid ? bdz(gid)
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bdz_groupname ? bdz(groupname)
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bdz_uid ? bdz(uid)
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bdz_name ? bdz(username)
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✅ bdz_gid ? bdz(gid)
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✅ bdz_groupname ? bdz(groupname)
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✅ bdz_uid ? bdz(uid)
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✅ bdz_name ? bdz(username)
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idx_gid2group len(group)*29/8 bdz->offset Groups
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idx_groupname2group len(group)*29/8 bdz->offset Groups
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idx_uid2user len(user)*29/8 bdz->offset Users
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@ -5,7 +5,7 @@ const c = @cImport({
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@cInclude("bdz.h");
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});
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pub fn search_packed(packed_mphf: []const u8, key: []const u8) error{Overflow}!u32 {
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pub fn search(packed_mphf: []const u8, key: []const u8) error{Overflow}!u32 {
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const bdz_start = @intToPtr(?*anyopaque, @ptrToInt(&packed_mphf[0]));
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const len = try std.math.cast(c_uint, key.len);
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return @as(u32, c.bdz_search_packed(bdz_start, key.ptr, len));
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@ -59,7 +59,7 @@ test "basic pack/unpack" {
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var used: [items_len]bool = undefined;
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inline for (items) |elem| {
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const hashed = try bdz.search_packed(buf, elem);
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const hashed = try bdz.search(buf, elem);
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used[hashed] = true;
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}
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@ -1,7 +1,19 @@
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const std = @import("std");
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const PackedGroup = packed struct {
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gid: u32,
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members_offset: u27,
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groupname_len: u5,
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};
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const Group = struct {
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gid: u32,
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name: []const u8,
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members: std.BufSet,
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};
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const testing = std.testing;
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test "PackedGroup alignment" {
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try testing.expectEqual(@sizeOf(PackedGroup) * 8, @bitSizeOf(PackedGroup));
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}
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@ -248,7 +248,7 @@ test "PackedUser internal and external alignment" {
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// cannot be converted from/to [@bitSizeOf(PackedUser)/8]u8;
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// asBytes/bytesAsValue use @sizeOf, which is larger. Now we are putting no
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// more than 1, but it probably could be higher.
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try testing.expect(@bitSizeOf(PackedUser) - @sizeOf(PackedUser) * 8 <= 8);
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try testing.expect(@sizeOf(PackedUser) * 8 - @bitSizeOf(PackedUser) <= 8);
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}
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fn testShellIndex(shell: []const u8) ?u6 {
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