Starting work on inode decoding

2025-05-12 13:46:46 -05:00
parent 58e89c0981
commit b3a5ff8f94
7 changed files with 236 additions and 81 deletions
@@ -0,0 +1,54 @@
+const std = @import("std");
+
+pub const FileInode = struct {
+    start: u32,
+    frag_index: u32,
+    frag_block_offset: u32,
+    size: u32,
+    block_sizes: []const u32,
+};
+
+pub fn readFileInode(rdr: std.io.AnyReader, block_size: u32) !FileInode {
+    const out = FileInode{
+        .start = try rdr.readInt(u32, std.builtin.Endian.little),
+        .frag_index = try rdr.readInt(u32, std.builtin.Endian.little),
+        .frag_block_offset = try rdr.readInt(u32, std.builtin.Endian.little),
+        .size = try rdr.readInt(u32, std.builtin.Endian.little),
+        .block_sizes = undefined,
+    };
+    var block_num = out.size / block_size;
+    if (out.frag_index != 0xFFFFFFFF and out.size % block_size != 0) {
+        block_num += 1;
+    }
+    return out;
+}
+
+pub const ExtFileInode = struct {
+    start: u64,
+    size: u64,
+    sparse: u64,
+    hard_links: u32,
+    frag_index: u32,
+    frag_block_offset: u32,
+    xattr_index: u32,
+    block_sizes: []const u32,
+};
+
+pub fn readExtFileInode(rdr: std.io.AnyReader, block_size: u32) !ExtFileInode {
+    const out = ExtFileInode{
+        .start = try rdr.readInt(u64, std.builtin.Endian.little),
+        .size = try rdr.readInt(u64, std.builtin.Endian.little),
+        .sparse = try rdr.readInt(u64, std.builtin.Endian.little),
+        .hard_links = try rdr.readInt(u32, std.builtin.Endian.little),
+        .frag_index = try rdr.readInt(u32, std.builtin.Endian.little),
+        .frag_block_offset = try rdr.readInt(u32, std.builtin.Endian.little),
+        .xattr_index = try rdr.readInt(u32, std.builtin.Endian.little),
+        .block_sizes = undefined,
+    };
+    var block_num = out.size / block_size;
+    if (out.frag_index != 0xFFFFFFFF and out.size % block_size != 0) {
+        block_num += 1;
+    }
+    //TODO: stuff
+    return out;
+}