Caleb Gardner
66 lines
2.0 KiB
Zig
66 lines
2.0 KiB
Zig
const std = @import("std");
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const io = std.io;
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pub const DirInode = packed struct {
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dir_block_start: u32,
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hard_links: u32,
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dir_table_size: u16,
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dir_block_offset: u16,
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parent_inode_num: u32,
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};
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pub fn readDirInode(rdr: io.AnyReader) !DirInode {
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return try rdr.readStruct(DirInode);
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}
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pub const DirIndex = struct {
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dir_header_offset: u32,
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dir_table_offset: u32,
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name_size: u32,
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name: []const u8,
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};
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fn readDirIndex(rdr: io.AnyReader) !DirIndex {
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const out = DirIndex{
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.dir_header_offset = try rdr.readInt(u32, std.builtin.Endian.little),
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.dir_table_offset = try rdr.readInt(u32, std.builtin.Endian.little),
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.name_size = try rdr.readInt(u32, std.builtin.Endian.little),
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.name = undefined,
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};
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const buf = try std.heap.page_allocator.alloc(u8, out.name_size);
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defer std.heap.page_allocator.free(buf);
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try rdr.read(buf);
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out.name = buf[0..];
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return out;
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}
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pub const ExtDirInode = struct {
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hard_links: u32,
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dir_table_size: u32,
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dir_block_start: u32,
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parent_inode_num: u32,
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dir_index_count: u16,
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dir_block_offset: u16,
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xattr_index: u32,
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indexes: []const DirIndex,
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};
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pub fn readExtDirInode(rdr: io.AnyReader) !ExtDirInode {
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const out = ExtDirInode{
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.hard_links = rdr.readInt(u32, std.builtin.Endian.little),
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.dir_table_size = rdr.readInt(u32, std.builtin.Endian.little),
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.dir_block_start = rdr.readInt(u32, std.builtin.Endian.little),
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.parent_inode_num = rdr.readInt(u32, std.builtin.Endian.little),
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.dir_index_count = rdr.readInt(u16, std.builtin.Endian.little),
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.dir_block_offset = rdr.readInt(u16, std.builtin.Endian.little),
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.xattr_index = rdr.readInt(u32, std.builtin.Endian.little),
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.indexes = undefined,
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};
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out.indexes = []const DirIndex{undefined} ** out.dir_index_count;
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const i: u16 = 0;
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while (i < out.dir_index_count) : (i += 1) {
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out.indexes[i] = try readDirIndex(rdr);
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}
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return out;
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}
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