Inodes! ExtractionOptions! Files! Directories!

src/inode.zig

@@ -1,5 +1,94 @@
+const std = @import("std");
+const Reader = std.Io.Reader;
+
+const dir = @import("inode_data/dir.zig");
+const file = @import("inode_data/file.zig");
+const misc = @import("inode_data/misc.zig");
+
 pub const Ref = packed struct {
-    _: u16,
-    table_offset: u32,
     block_offset: u16,
+    block_start: u32,
+    _: u16,
 };
+
+pub const InodeType = enum(u16) {
+    dir = 1,
+    file,
+    symlink,
+    block_dev,
+    char_dev,
+    fifo,
+    socket,
+    ext_dir,
+    ext_file,
+    ext_symlink,
+    ext_block_dev,
+    ext_char_dev,
+    ext_fifo,
+    ext_socket,
+};
+
+pub const InodeData = union(InodeType) {
+    dir: dir.Dir,
+    file: file.File,
+    symlink: misc.Symlink,
+    block_dev: misc.Dev,
+    char_dev: misc.Dev,
+    fifo: misc.IPC,
+    socket: misc.IPC,
+    ext_dir: dir.ExtDir,
+    ext_file: file.ExtFile,
+    ext_symlink: misc.ExtSymlink,
+    ext_block_dev: misc.ExtDev,
+    ext_char_dev: misc.ExtDev,
+    ext_fifo: misc.ExtIPC,
+    ext_socket: misc.ExtIPC,
+};
+
+pub const Header = packed struct {
+    inode_type: InodeType,
+    permissions: u16,
+    uid_idx: u16,
+    gid_idx: u16,
+    mod_time: u32,
+    num: u32,
+};
+
+const Inode = @This();
+
+hdr: Header,
+data: InodeData,
+
+pub fn read(alloc: std.mem.Allocator, rdr: *Reader, block_size: u32) !Inode {
+    var hdr: Header = undefined;
+    try rdr.readSliceEndian(Header, @ptrCast(&hdr), .little);
+    return .{
+        .hdr = hdr,
+        .data = switch (hdr.inode_type) {
+            .dir => .{ .dir = .read(rdr) },
+            .file => .{ .file = .read(alloc, rdr, block_size) },
+            .symlink => .{ .symlink = .read(alloc, rdr) },
+            .block_dev => .{ .block_dev = .read(rdr) },
+            .char_dev => .{ .char_dev = .read(rdr) },
+            .fifo => .{ .fifo = .read(rdr) },
+            .socket => .{ .socket = .read(rdr) },
+            .ext_dir => .{ .ext_dir = .read(rdr) },
+            .ext_file => .{ .ext_file = .read(alloc, rdr, block_size) },
+            .ext_symlink => .{ .ext_symlink = .read(alloc, rdr) },
+            .ext_block_dev => .{ .ext_block_dev = .read(rdr) },
+            .ext_char_dev => .{ .ext_char_dev = .read(rdr) },
+            .ext_fifo => .{ .ext_fifo = .read(rdr) },
+            .ext_socket => .{ .ext_socket = .read(rdr) },
+        },
+    };
+}
+
+pub fn deinit(self: Inode, alloc: std.mem.Allocator) void {
+    switch (self.data) {
+        .file => |f| alloc.free(f.block_sizes),
+        .ext_file => |f| alloc.free(f.block_sizes),
+        .symlink => |s| alloc.free(s.target),
+        .ext_symlink => |s| alloc.free(s.target),
+        else => {},
+    }
+}