107 lines
3.0 KiB
C#
107 lines
3.0 KiB
C#
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///////////////////////////////////////////////////////////////////////////////
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//
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// Microsoft Research Singularity
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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///////////////////////////////////////////////////////////////////////////////
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using System;
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using System.IO;
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using Microsoft.Contracts;
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namespace Iso9660 {
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public struct Iso9660Ptr {
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public byte[] buf;
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public int pos;
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public Iso9660Ptr(byte[] newbuf, int newpos) {
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buf = newbuf;
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pos = newpos;
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}
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public void Reset() {
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buf = new byte[buf.Length];
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pos = 0;
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}
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}
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[Flags]
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public enum Iso9660FileFlags : uint {
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Normal=0,
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Directory=2,
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}
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public struct Iso9660FileAttributes {
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public Iso9660FileFlags flags;
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public long size;
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}
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public class Iso9660IOException : IOException {
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public Iso9660IOException(string str) : base(str) {}
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}
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public class DirEnt {
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public const int LEN = 0; // 1 byte
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public const int BLOCK_NO = 6; // 4-byte LE int
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public const int SIZE = 14; // 4-byte LE int
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public const int FLAGS = 25; // 1 byte
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public const int NAME_LEN = 32; // 1 byte
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public const int NAME = 33; // <NAME_LEN> chars
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}
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public class SuperBlock {
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public const int TYPE = 0; // 1 byte (SB => 0x01)
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public const int IDENT = 1; // 5 chars ("CD001")
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public const int LABEL = 40; // 32 chars
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public const int SET_SIZE = 122; // 2-byte LE int
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public const int SEQ_NO = 126; // 2-byte LE int
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public const int BLK_SIZE = 130; // 2-byte LE int
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public const int ROOT_DIR = 156; // Root's DirEnt
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public const string DELIMITER = "/";
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internal static Iso9660DirectoryInfo root;
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public static Iso9660DirectoryInfo Root {
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get{return root;}
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}
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static SuperBlock() {}
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public static bool Unmarshall(byte[] buf) {
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//
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// 1. check media & show label
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//
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ushort set = ByteArray.ToUshort (buf, SET_SIZE);
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ushort seq = ByteArray.ToUshort (buf, SEQ_NO);
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ushort blk = ByteArray.ToUshort (buf, BLK_SIZE);
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if (set != 1 || seq != 1 || blk != 2048) {
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Console.WriteLine ("unknown/unsupported media" +
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" (set["+set+"]/seq["+seq+"]/blk["+blk+"])");
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return false;
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}
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string label = ByteArray.ToString (buf, LABEL, 32);
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Console.WriteLine("label: \"" + label + "\"");
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//
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// 2. "unmarshall" & init root
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//
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int pos = ROOT_DIR;
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root = new Iso9660DirectoryInfo();
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root.InitializeMe (buf, pos);
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root.myPrefix = "";
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return true;
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}
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}
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}
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