Finished? inodes

src/inode/file.zig

@@ -0,0 +1,72 @@
+const std = @import("std");
+const io = std.io;
+
+pub const BlockSize = packed struct { size: u23, not_compressed: bool, _: u8 };
+
+pub const FileInode = struct {
+    data_start: u32,
+    frag_idx: u32,
+    frag_offset: u32,
+    size: u32,
+    blocks: []const BlockSize,
+
+    pub fn init(alloc: std.mem.Allocator, rdr: io.AnyReader, block_size: u32) !FileInode {
+        const fixed_buf = [_]u8{0} ** 16;
+        _ = try rdr.readAll(&fixed_buf);
+        const frag_idx = std.mem.bytesToValue(u32, fixed_buf[4..8]);
+        const size = std.mem.bytesToValue(u32, fixed_buf[12..16]);
+        var block_num = size / block_size;
+        if (frag_idx != 0xFFFFFFFF) {
+            block_num += 1;
+        }
+        const blocks = try alloc.alloc(BlockSize, block_num);
+        _ = try rdr.readAll(std.mem.asBytes(blocks));
+        return .{
+            .data_start = std.mem.bytesToValue(u32, fixed_buf[0..4]),
+            .frag_idx = frag_idx,
+            .frag_offset = std.mem.bytesToValue(u32, fixed_buf[8..12]),
+            .size = size,
+            .blocks = blocks,
+        };
+    }
+    pub fn deinit(self: FileInode, alloc: std.mem.Allocator) void {
+        alloc.free(self.blocks);
+    }
+};
+
+pub const ExtFileInode = struct {
+    data_start: u64,
+    size: u64,
+    sparse: u64,
+    hard_links: u32,
+    frag_idx: u32,
+    frag_offset: u32,
+    xattr_idx: u32,
+    blocks: []const BlockSize,
+
+    pub fn init(alloc: std.mem.Allocator, rdr: io.AnyReader, block_size: u32) !ExtFileInode {
+        const fixed_buf = [_]u8{0} ** 40;
+        _ = try rdr.readAll(&fixed_buf);
+        const size = std.mem.bytesToValue(u64, fixed_buf[8..16]);
+        const frag_idx = std.mem.bytesToValue(u32, fixed_buf[28..32]);
+        var block_num = size / block_size;
+        if (frag_idx != 0xFFFFFFFF) {
+            block_num += 1;
+        }
+        const blocks = try alloc.alloc(BlockSize, block_num);
+        _ = try rdr.readAll(std.mem.asBytes(blocks));
+        return .{
+            .data_start = std.mem.bytesToValue(u64, fixed_buf[0..8]),
+            .size = size,
+            .sparse = std.mem.bytesToValue(u64, fixed_buf[16..24]),
+            .hard_links = std.mem.bytesToValue(u32, fixed_buf[24..28]),
+            .frag_idx = frag_idx,
+            .frag_offset = std.mem.bytesToValue(u32, fixed_buf[32..36]),
+            .xattr_idx = std.mem.bytesToValue(u32, fixed_buf[36..40]),
+            .blocks = blocks,
+        };
+    }
+    pub fn deinit(self: ExtFileInode, alloc: std.mem.Allocator) void {
+        alloc.free(self.blocks);
+    }
+};