mcs/tools/pdb2mdb/PdbFileHeader.cs

   1 //-----------------------------------------------------------------------------
   2 //
   3 // Copyright (C) Microsoft Corporation.  All Rights Reserved.
   4 //
   5 //-----------------------------------------------------------------------------
   6 using System;
   7 using System.IO;
   8 using System.Text;
   9
  10 namespace Microsoft.Cci.Pdb {
  11   internal class PdbFileHeader {
  12     internal PdbFileHeader(int pageSize) {
  13       this.magic = new byte[32] {
  14                 0x4D, 0x69, 0x63, 0x72, 0x6F, 0x73, 0x6F, 0x66, // "Microsof"
  15                 0x74, 0x20, 0x43, 0x2F, 0x43, 0x2B, 0x2B, 0x20, // "t C/C++ "
  16                 0x4D, 0x53, 0x46, 0x20, 0x37, 0x2E, 0x30, 0x30, // "MSF 7.00"
  17                 0x0D, 0x0A, 0x1A, 0x44, 0x53, 0x00, 0x00, 0x00  // "^^^DS^^^"
  18             };
  19       this.pageSize = pageSize;
  20       this.zero = 0;
  21     }
  22
  23     internal PdbFileHeader(Stream reader, BitAccess bits) {
  24       bits.MinCapacity(56);
  25       reader.Seek(0, SeekOrigin.Begin);
  26       bits.FillBuffer(reader, 56);
  27
  28       this.magic = new byte[32];
  29       bits.ReadBytes(this.magic);                 //   0..31
  30       bits.ReadInt32(out this.pageSize);          //  32..35
  31       bits.ReadInt32(out this.freePageMap);       //  36..39
  32       bits.ReadInt32(out this.pagesUsed);         //  40..43
  33       bits.ReadInt32(out this.directorySize);     //  44..47
  34       bits.ReadInt32(out this.zero);              //  48..51
  35       bits.ReadInt32(out this.directoryRoot);     //  52..55
  36     }
  37
  38     internal string Magic {
  39       get { return StringFromBytesUTF8(magic); }
  40     }
  41
  42     internal void Write(Stream writer, BitAccess bits) {
  43       bits.MinCapacity(56);
  44       bits.WriteBytes(magic);                     //   0..31
  45       bits.WriteInt32(pageSize);                  //  32..35
  46       bits.WriteInt32(freePageMap);               //  36..39
  47       bits.WriteInt32(pagesUsed);                 //  40..43
  48       bits.WriteInt32(directorySize);             //  44..47
  49       bits.WriteInt32(zero);                      //  48..51
  50       bits.WriteInt32(directoryRoot);             //  52..55
  51
  52       writer.Seek(0, SeekOrigin.Begin);
  53       bits.WriteBuffer(writer, 56);
  54     }
  55
  56     //////////////////////////////////////////////////// Helper Functions.
  57     //
  58     internal string StringFromBytesUTF8(byte[] bytes) {
  59       return StringFromBytesUTF8(bytes, 0, bytes.Length);
  60     }
  61
  62     internal string StringFromBytesUTF8(byte[] bytes, int offset, int length) {
  63       for (int i = 0; i < length; i++) {
  64         if (bytes[offset + i] < ' ') {
  65           length = i;
  66         }
  67       }
  68       return Encoding.UTF8.GetString(bytes, offset, length);
  69     }
  70
  71     ////////////////////////////////////////////////////////////// Fields.
  72     //
  73     internal readonly byte[] magic;
  74     internal readonly int pageSize;
  75     internal int freePageMap;
  76     internal int pagesUsed;
  77     internal int directorySize;
  78     internal readonly int zero;
  79     internal int directoryRoot;
  80   }
  81
  82 }