get rid of Corpus struct
it had some non-useful internal state
This commit is contained in:
Motiejus Jakštys
parent
b81072f726
commit
87c424aab9
255
src/sections.zig
255
src/sections.zig
@ -173,133 +173,130 @@ const Corpus = struct {
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}
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};
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pub const Sections = struct {
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allocator: Allocator,
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corpus: *const Corpus,
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pub fn bdzGid(allocator: Allocator, corpus: *const Corpus) cmph.Error![]const u8 {
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return try cmph.pack_u32(allocator, corpus.groupsMulti.items(.gid));
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}
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pub fn init(allocator: Allocator, corpus: *const Corpus) Sections {
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return Sections{
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.allocator = allocator,
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.corpus = corpus,
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};
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}
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pub fn bdzGroupname(allocator: Allocator, corpus: *const Corpus) cmph.Error![]const u8 {
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return try cmph.pack_str(allocator, corpus.groupsMulti.items(.name));
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}
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pub const GroupMembers = struct {
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offsets: []const usize,
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bytes: []const u8,
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};
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pub fn bdzUid(allocator: Allocator, corpus: *const Corpus) cmph.Error![]const u8 {
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return try cmph.pack_u32(allocator, corpus.usersMulti.items(.uid));
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}
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pub fn bdzGid(self: *const Sections) cmph.Error![]const u8 {
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return try cmph.pack_u32(self.allocator, self.corpus.groupsMulti.items(.gid));
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}
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pub fn bdzUsername(allocator: Allocator, corpus: *const Corpus) cmph.Error![]const u8 {
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return try cmph.pack_str(allocator, corpus.usersMulti.items(.name));
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}
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pub fn bdzGroupname(self: *const Sections) cmph.Error![]const u8 {
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return try cmph.pack_str(self.allocator, self.corpus.groupsMulti.items(.name));
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}
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pub const ShellSections = struct {
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index: []const u8,
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blob: []const u8,
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pub fn bdzUid(self: *const Sections) cmph.Error![]const u8 {
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return try cmph.pack_u32(self.allocator, self.corpus.usersMulti.items(.uid));
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}
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pub fn bdzUsername(self: *const Sections) cmph.Error![]const u8 {
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return try cmph.pack_str(self.allocator, self.corpus.usersMulti.items(.name));
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}
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pub const ShellSections = struct {
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index: []const u8,
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blob: []const u8,
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};
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// TODO(motiejus) there are a few problems:
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// - memory management for shell sections is a mess. Make it easier by ...
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// - shell module should accept a list of shells and spit out two slices
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// (allocated with a given allocator). There is too much dancing around
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// here.
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const shellSectionsErr = Allocator.Error || error{Overflow};
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pub fn shellSections(self: *const Sections) shellSectionsErr!ShellSections {
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var popcon = shellImport.ShellWriter.init(self.allocator);
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defer popcon.deinit();
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for (self.corpus.usersMulti.items(.shell)) |shell| {
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try popcon.put(shell);
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}
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var sections = try popcon.toOwnedSections(shellImport.max_shells);
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defer sections.deinit();
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return ShellSections{
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.index = try self.allocator.dupe(u8, sections.sectionIndex()),
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.blob = try self.allocator.dupe(u8, sections.sectionBlob()),
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};
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}
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pub const UserGids = struct {
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// username -> offset in blob
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name2offset: StringHashMap(u32),
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// compressed user gids blob. A blob contains N <= users.len items,
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// an item is:
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// len: varint
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// gid: [varint]varint,
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// ... and the gid list is delta-compressed.
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blob: []u8,
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};
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const userGidsErr = Allocator.Error || error{Overflow};
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pub fn userGids(self: *const Sections) userGidsErr!UserGids {
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var arena = std.heap.ArenaAllocator.init(self.allocator);
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defer arena.deinit();
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var blob = ArrayList(u8).init(self.allocator);
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var name2offset = StringHashMap(u32).init(self.allocator);
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for (self.corpus.users) |user| {
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const usergroups_maybe = self.corpus.username2groups.get(user.name);
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if (usergroups_maybe == null)
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continue;
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const usergroups = usergroups_maybe.?;
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try name2offset.putNoClobber(user.name, try math.cast(u32, blob.items.len));
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var userBlob = try ArrayList(u8).initCapacity(arena.allocator(), usergroups.len * 2);
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var deltaCompressedGids = try arena.allocator().alloc(u32, usergroups.len);
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deltaCompressedGids.len = usergroups.len;
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for (usergroups) |group, i| {
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deltaCompressedGids[i] = group.gid;
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}
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compress.deltaCompress(u32, deltaCompressedGids) catch |err| switch (err) {
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error.NotSorted => unreachable,
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};
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try compress.appendUvarint(&userBlob, usergroups.len);
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for (deltaCompressedGids) |gid| {
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try compress.appendUvarint(&userBlob, gid);
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}
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try blob.appendSlice(userBlob.toOwnedSlice());
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}
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return UserGids{
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.name2offset = name2offset,
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.blob = blob.toOwnedSlice(),
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};
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}
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pub fn groupMembers(self: *const Sections) Allocator.Error!GroupMembers {
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var buf: [compress.maxVarintLen64]u8 = undefined;
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var offsets = ArrayListUnmanaged(usize).initCapacity(
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self.allocator,
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self.corpus.groups.len,
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);
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var bytes = ArrayList(u8).init(self.allocator);
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var offset: usize = 0;
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for (self.corpus.groups) |group, i| {
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offsets[i] = offset;
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const users = self.corpus.groupname2users.get(group.name).?;
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const len = compress.putVarint(&buf, users.len);
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offset += len;
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try bytes.appendSlice(buf[0..len]);
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for (users) |user| {
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// TODO: offset into the User's record
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_ = user;
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}
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}
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pub fn deinit(self: *ShellSections, allocator: Allocator) void {
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allocator.free(self.index);
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allocator.free(self.blob);
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self.* = undefined;
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}
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};
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// TODO(motiejus) there are a few problems:
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// - memory management for shell sections is a mess. Make it easier by ...
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// - shell module should accept a list of shells and spit out two slices
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// (allocated with a given allocator). There is too much dancing around
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// here.
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const shellSectionsErr = Allocator.Error || error{Overflow};
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pub fn shellSections(
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allocator: Allocator,
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corpus: *const Corpus,
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) shellSectionsErr!ShellSections {
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var popcon = shellImport.ShellWriter.init(allocator);
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defer popcon.deinit();
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for (corpus.usersMulti.items(.shell)) |shell| {
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try popcon.put(shell);
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}
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var sections = try popcon.toOwnedSections(shellImport.max_shells);
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defer sections.deinit();
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return ShellSections{
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.index = try allocator.dupe(u8, sections.sectionIndex()),
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.blob = try allocator.dupe(u8, sections.sectionBlob()),
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};
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}
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pub const UserGids = struct {
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// username -> offset in blob
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name2offset: StringHashMap(u32),
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// compressed user gids blob. A blob contains N <= users.len items,
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// an item is:
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// len: varint
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// gid: [varint]varint,
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// ... and the gid list is delta-compressed.
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blob: []u8,
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pub fn deinit(self: *UserGids, allocator: Allocator) void {
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self.name2offset.deinit();
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allocator.free(self.blob);
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self.* = undefined;
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}
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};
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const userGidsErr = Allocator.Error || error{Overflow};
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pub fn userGids(allocator: Allocator, corpus: *const Corpus) userGidsErr!UserGids {
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var arena = std.heap.ArenaAllocator.init(allocator);
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defer arena.deinit();
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var blob = ArrayList(u8).init(allocator);
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var name2offset = StringHashMap(u32).init(allocator);
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for (corpus.users) |user| {
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const usergroups_maybe = corpus.username2groups.get(user.name);
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if (usergroups_maybe == null)
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continue;
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const usergroups = usergroups_maybe.?;
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try name2offset.putNoClobber(user.name, try math.cast(u32, blob.items.len));
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var deltaCompressedGids = try arena.allocator().alloc(u32, usergroups.len);
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deltaCompressedGids.len = usergroups.len;
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for (usergroups) |group, i| {
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deltaCompressedGids[i] = group.gid;
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}
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compress.deltaCompress(u32, deltaCompressedGids) catch |err| switch (err) {
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error.NotSorted => unreachable,
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};
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try compress.appendUvarint(&blob, usergroups.len);
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for (deltaCompressedGids) |gid| {
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try compress.appendUvarint(&blob, gid);
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}
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}
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return UserGids{
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.name2offset = name2offset,
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.blob = blob.toOwnedSlice(),
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};
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}
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pub fn groupMembers(allocator: Allocator, corpus: *const Corpus) Allocator.Error!void {
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var buf: [compress.maxVarintLen64]u8 = undefined;
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var offsets = ArrayListUnmanaged(usize).initCapacity(
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allocator,
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corpus.groups.len,
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);
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var bytes = ArrayList(u8).init(allocator);
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var offset: usize = 0;
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for (corpus.groups) |group, i| {
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offsets[i] = offset;
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const users = corpus.groupname2users.get(group.name).?;
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const len = compress.putVarint(&buf, users.len);
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offset += len;
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try bytes.appendSlice(buf[0..len]);
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for (users) |user| {
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// TODO: offset into the User's record
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_ = user;
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}
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}
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}
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// cmpUser compares two users for sorting. By username's utf8 codepoints, ascending.
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fn cmpUser(_: void, a: User, b: User) bool {
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var utf8_a = (unicode.Utf8View.init(a.name) catch unreachable).iterator();
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@ -437,27 +434,23 @@ test "test sections" {
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var corpus = try testCorpus(allocator);
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defer corpus.deinit();
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var sections = Sections.init(allocator, &corpus);
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const bdz_gid = try sections.bdzGid();
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const bdz_gid = try bdzGid(allocator, &corpus);
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defer allocator.free(bdz_gid);
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const bdz_groupname = try sections.bdzGroupname();
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const bdz_groupname = try bdzGroupname(allocator, &corpus);
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defer allocator.free(bdz_groupname);
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const bdz_uid = try sections.bdzUid();
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const bdz_uid = try bdzUid(allocator, &corpus);
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defer allocator.free(bdz_uid);
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const bdz_username = try sections.bdzUsername();
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const bdz_username = try bdzUsername(allocator, &corpus);
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defer allocator.free(bdz_username);
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const shell_sections = try sections.shellSections();
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defer allocator.free(shell_sections.index);
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defer allocator.free(shell_sections.blob);
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var shell_sections = try shellSections(allocator, &corpus);
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defer shell_sections.deinit(allocator);
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var user_gids = try sections.userGids();
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defer user_gids.name2offset.deinit();
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defer allocator.free(user_gids.blob);
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var user_gids = try userGids(allocator, &corpus);
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defer user_gids.deinit(allocator);
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}
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test "pack gids" {
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