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//-----------------------------------------------------------------------------
//
// Copyright (c) Microsoft. All rights reserved.
// This code is licensed under the Microsoft Public License.
// THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
// IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
// PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
//
//-----------------------------------------------------------------------------
using System;
using System.IO;
using System.Text;
namespace Microsoft.Cci.Pdb {
internal class PdbFileHeader {
//internal PdbFileHeader(int pageSize) {
// this.magic = new byte[32] {
// 0x4D, 0x69, 0x63, 0x72, 0x6F, 0x73, 0x6F, 0x66, // "Microsof"
// 0x74, 0x20, 0x43, 0x2F, 0x43, 0x2B, 0x2B, 0x20, // "t C/C++ "
// 0x4D, 0x53, 0x46, 0x20, 0x37, 0x2E, 0x30, 0x30, // "MSF 7.00"
// 0x0D, 0x0A, 0x1A, 0x44, 0x53, 0x00, 0x00, 0x00 // "^^^DS^^^"
// };
// this.pageSize = pageSize;
//}
internal PdbFileHeader(Stream reader, BitAccess bits) {
bits.MinCapacity(56);
reader.Seek(0, SeekOrigin.Begin);
bits.FillBuffer(reader, 52);
this.magic = new byte[32];
bits.ReadBytes(this.magic); // 0..31
bits.ReadInt32(out this.pageSize); // 32..35
bits.ReadInt32(out this.freePageMap); // 36..39
bits.ReadInt32(out this.pagesUsed); // 40..43
bits.ReadInt32(out this.directorySize); // 44..47
bits.ReadInt32(out this.zero); // 48..51
int directoryPages = ((((directorySize + pageSize - 1) / pageSize) * 4) + pageSize - 1) / pageSize;
this.directoryRoot = new int[directoryPages];
bits.FillBuffer(reader, directoryPages * 4);
bits.ReadInt32(this.directoryRoot);
}
//internal string Magic {
// get { return StringFromBytesUTF8(magic); }
//}
//internal void Write(Stream writer, BitAccess bits) {
// bits.MinCapacity(pageSize);
// bits.WriteBytes(magic); // 0..31
// bits.WriteInt32(pageSize); // 32..35
// bits.WriteInt32(freePageMap); // 36..39
// bits.WriteInt32(pagesUsed); // 40..43
// bits.WriteInt32(directorySize); // 44..47
// bits.WriteInt32(zero); // 48..51
// bits.WriteInt32(directoryRoot); // 52..55
// writer.Seek(0, SeekOrigin.Begin);
// bits.WriteBuffer(writer, pageSize);
//}
//////////////////////////////////////////////////// Helper Functions.
//
//internal static string StringFromBytesUTF8(byte[] bytes) {
// return StringFromBytesUTF8(bytes, 0, bytes.Length);
//}
//internal static string StringFromBytesUTF8(byte[] bytes, int offset, int length) {
// for (int i = 0; i < length; i++) {
// if (bytes[offset + i] < ' ') {
// length = i;
// }
// }
// return Encoding.UTF8.GetString(bytes, offset, length);
//}
////////////////////////////////////////////////////////////// Fields.
//
internal readonly byte[] magic;
internal readonly int pageSize;
internal int freePageMap;
internal int pagesUsed;
internal int directorySize;
internal readonly int zero;
internal int[] directoryRoot;
}
}
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