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//
// ImageReader.cs
//
// Author:
// Jb Evain (jbevain@gmail.com)
//
// (C) 2005 - 2007 Jb Evain
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
namespace CilStrip.Mono.Cecil.Binary {
using System;
using System.IO;
using System.Text;
using CilStrip.Mono.Cecil.Metadata;
sealed class ImageReader : BaseImageVisitor {
MetadataReader m_mdReader;
BinaryReader m_binaryReader;
Image m_image;
public MetadataReader MetadataReader {
get { return m_mdReader; }
}
public Image Image {
get { return m_image; }
}
ImageReader (Image img, BinaryReader reader)
{
m_image = img;
m_binaryReader = reader;
}
static ImageReader Read (Image img, Stream stream)
{
ImageReader reader = new ImageReader (img, new BinaryReader (stream));
img.Accept (reader);
return reader;
}
public static ImageReader Read (string file)
{
if (file == null)
throw new ArgumentNullException ("file");
FileInfo fi = new FileInfo (file);
if (!File.Exists (fi.FullName))
#if CF_1_0 || CF_2_0
throw new FileNotFoundException (fi.FullName);
#else
throw new FileNotFoundException (string.Format ("File '{0}' not found.", fi.FullName), fi.FullName);
#endif
FileStream stream = null;
try {
stream = new FileStream (fi.FullName, FileMode.Open, FileAccess.Read, FileShare.Read);
return Read (new Image (fi), stream);
} catch (Exception e) {
if (stream != null)
stream.Close ();
#if CF_1_0 || CF_2_0
throw new BadImageFormatException ("Invalid PE file: " + file, e);
#else
throw new BadImageFormatException ("Invalid PE file", file, e);
#endif
}
}
public static ImageReader Read (byte [] image)
{
if (image == null)
throw new ArgumentNullException ("image");
if (image.Length == 0)
throw new ArgumentException ("Empty image array");
return Read (new Image (), new MemoryStream (image));
}
public static ImageReader Read (Stream stream)
{
if (stream == null)
throw new ArgumentNullException ("stream");
if (!stream.CanRead)
throw new ArgumentException ("Can not read from stream");
return Read (new Image (), stream);
}
public BinaryReader GetReader ()
{
return m_binaryReader;
}
public override void VisitImage (Image img)
{
m_mdReader = new MetadataReader (this);
}
void SetPositionToAddress (RVA address)
{
m_binaryReader.BaseStream.Position = m_image.ResolveVirtualAddress (address);
}
public override void VisitDOSHeader (DOSHeader header)
{
header.Start = m_binaryReader.ReadBytes (60);
header.Lfanew = m_binaryReader.ReadUInt32 ();
header.End = m_binaryReader.ReadBytes (64);
m_binaryReader.BaseStream.Position = header.Lfanew;
if (m_binaryReader.ReadUInt16 () != 0x4550 ||
m_binaryReader.ReadUInt16 () != 0)
throw new ImageFormatException ("Invalid PE File Signature");
}
public override void VisitPEFileHeader (PEFileHeader header)
{
header.Machine = m_binaryReader.ReadUInt16 ();
header.NumberOfSections = m_binaryReader.ReadUInt16 ();
header.TimeDateStamp = m_binaryReader.ReadUInt32 ();
header.PointerToSymbolTable = m_binaryReader.ReadUInt32 ();
header.NumberOfSymbols = m_binaryReader.ReadUInt32 ();
header.OptionalHeaderSize = m_binaryReader.ReadUInt16 ();
header.Characteristics = (ImageCharacteristics) m_binaryReader.ReadUInt16 ();
}
ulong ReadIntOrLong ()
{
return m_image.PEOptionalHeader.StandardFields.IsPE64 ?
m_binaryReader.ReadUInt64 () :
m_binaryReader.ReadUInt32 ();
}
RVA ReadRVA ()
{
return m_binaryReader.ReadUInt32 ();
}
DataDirectory ReadDataDirectory ()
{
return new DataDirectory (ReadRVA (), m_binaryReader.ReadUInt32 ());
}
public override void VisitNTSpecificFieldsHeader (PEOptionalHeader.NTSpecificFieldsHeader header)
{
header.ImageBase = ReadIntOrLong ();
header.SectionAlignment = m_binaryReader.ReadUInt32 ();
header.FileAlignment = m_binaryReader.ReadUInt32 ();
header.OSMajor = m_binaryReader.ReadUInt16 ();
header.OSMinor = m_binaryReader.ReadUInt16 ();
header.UserMajor = m_binaryReader.ReadUInt16 ();
header.UserMinor = m_binaryReader.ReadUInt16 ();
header.SubSysMajor = m_binaryReader.ReadUInt16 ();
header.SubSysMinor = m_binaryReader.ReadUInt16 ();
header.Reserved = m_binaryReader.ReadUInt32 ();
header.ImageSize = m_binaryReader.ReadUInt32 ();
header.HeaderSize = m_binaryReader.ReadUInt32 ();
header.FileChecksum = m_binaryReader.ReadUInt32 ();
header.SubSystem = (SubSystem) m_binaryReader.ReadUInt16 ();
header.DLLFlags = m_binaryReader.ReadUInt16 ();
header.StackReserveSize = ReadIntOrLong ();
header.StackCommitSize = ReadIntOrLong ();
header.HeapReserveSize = ReadIntOrLong ();
header.HeapCommitSize = ReadIntOrLong ();
header.LoaderFlags = m_binaryReader.ReadUInt32 ();
header.NumberOfDataDir = m_binaryReader.ReadUInt32 ();
}
public override void VisitStandardFieldsHeader (PEOptionalHeader.StandardFieldsHeader header)
{
header.Magic = m_binaryReader.ReadUInt16 ();
header.LMajor = m_binaryReader.ReadByte ();
header.LMinor = m_binaryReader.ReadByte ();
header.CodeSize = m_binaryReader.ReadUInt32 ();
header.InitializedDataSize = m_binaryReader.ReadUInt32 ();
header.UninitializedDataSize = m_binaryReader.ReadUInt32 ();
header.EntryPointRVA = ReadRVA ();
header.BaseOfCode = ReadRVA ();
if (!header.IsPE64)
header.BaseOfData = ReadRVA ();
}
public override void VisitDataDirectoriesHeader (PEOptionalHeader.DataDirectoriesHeader header)
{
header.ExportTable = ReadDataDirectory ();
header.ImportTable = ReadDataDirectory ();
header.ResourceTable = ReadDataDirectory ();
header.ExceptionTable = ReadDataDirectory ();
header.CertificateTable = ReadDataDirectory ();
header.BaseRelocationTable = ReadDataDirectory ();
header.Debug = ReadDataDirectory ();
header.Copyright = ReadDataDirectory ();
header.GlobalPtr = ReadDataDirectory ();
header.TLSTable = ReadDataDirectory ();
header.LoadConfigTable = ReadDataDirectory ();
header.BoundImport = ReadDataDirectory ();
header.IAT = ReadDataDirectory ();
header.DelayImportDescriptor = ReadDataDirectory ();
header.CLIHeader = ReadDataDirectory ();
header.Reserved = ReadDataDirectory ();
if (header.CLIHeader != DataDirectory.Zero)
m_image.CLIHeader = new CLIHeader ();
if (header.ExportTable != DataDirectory.Zero)
m_image.ExportTable = new ExportTable ();
}
public override void VisitSectionCollection (SectionCollection coll)
{
for (int i = 0; i < m_image.PEFileHeader.NumberOfSections; i++)
coll.Add (new Section ());
}
public override void VisitSection (Section sect)
{
char [] buffer = new char [8];
int read = 0;
while (read < 8) {
char cur = (char) m_binaryReader.ReadSByte ();
if (cur == '\0') {
m_binaryReader.BaseStream.Position += 8 - read - 1;
break;
}
buffer [read++] = cur;
}
sect.Name = read == 0 ? string.Empty : new string (buffer, 0, read);
if (sect.Name == Section.Text)
m_image.TextSection = sect;
sect.VirtualSize = m_binaryReader.ReadUInt32 ();
sect.VirtualAddress = ReadRVA ();
sect.SizeOfRawData = m_binaryReader.ReadUInt32 ();
sect.PointerToRawData = ReadRVA ();
sect.PointerToRelocations = ReadRVA ();
sect.PointerToLineNumbers = ReadRVA ();
sect.NumberOfRelocations = m_binaryReader.ReadUInt16 ();
sect.NumberOfLineNumbers = m_binaryReader.ReadUInt16 ();
sect.Characteristics = (SectionCharacteristics) m_binaryReader.ReadUInt32 ();
long pos = m_binaryReader.BaseStream.Position;
m_binaryReader.BaseStream.Position = sect.PointerToRawData;
sect.Data = m_binaryReader.ReadBytes ((int) sect.SizeOfRawData);
m_binaryReader.BaseStream.Position = pos;
}
public override void VisitImportAddressTable (ImportAddressTable iat)
{
if (m_image.PEOptionalHeader.DataDirectories.IAT.VirtualAddress == RVA.Zero)
return;
SetPositionToAddress (m_image.PEOptionalHeader.DataDirectories.IAT.VirtualAddress);
iat.HintNameTableRVA = ReadRVA ();
}
public override void VisitCLIHeader (CLIHeader header)
{
if (m_image.PEOptionalHeader.DataDirectories.Debug != DataDirectory.Zero) {
m_image.DebugHeader = new DebugHeader ();
VisitDebugHeader (m_image.DebugHeader);
}
SetPositionToAddress (m_image.PEOptionalHeader.DataDirectories.CLIHeader.VirtualAddress);
header.Cb = m_binaryReader.ReadUInt32 ();
header.MajorRuntimeVersion = m_binaryReader.ReadUInt16 ();
header.MinorRuntimeVersion = m_binaryReader.ReadUInt16 ();
header.Metadata = ReadDataDirectory ();
header.Flags = (RuntimeImage) m_binaryReader.ReadUInt32 ();
header.EntryPointToken = m_binaryReader.ReadUInt32 ();
header.Resources = ReadDataDirectory ();
header.StrongNameSignature = ReadDataDirectory ();
header.CodeManagerTable = ReadDataDirectory ();
header.VTableFixups = ReadDataDirectory ();
header.ExportAddressTableJumps = ReadDataDirectory ();
header.ManagedNativeHeader = ReadDataDirectory ();
if (header.StrongNameSignature != DataDirectory.Zero) {
SetPositionToAddress (header.StrongNameSignature.VirtualAddress);
header.ImageHash = m_binaryReader.ReadBytes ((int) header.StrongNameSignature.Size);
} else
header.ImageHash = new byte [0];
SetPositionToAddress (m_image.CLIHeader.Metadata.VirtualAddress);
m_image.MetadataRoot.Accept (m_mdReader);
}
public override void VisitDebugHeader (DebugHeader header)
{
if (m_image.PEOptionalHeader.DataDirectories.Debug == DataDirectory.Zero)
return;
long pos = m_binaryReader.BaseStream.Position;
SetPositionToAddress (m_image.PEOptionalHeader.DataDirectories.Debug.VirtualAddress);
header.Characteristics = m_binaryReader.ReadUInt32 ();
header.TimeDateStamp = m_binaryReader.ReadUInt32 ();
header.MajorVersion = m_binaryReader.ReadUInt16 ();
header.MinorVersion = m_binaryReader.ReadUInt16 ();
header.Type = (DebugStoreType) m_binaryReader.ReadUInt32 ();
header.SizeOfData = m_binaryReader.ReadUInt32 ();
header.AddressOfRawData = ReadRVA ();
header.PointerToRawData = m_binaryReader.ReadUInt32 ();
m_binaryReader.BaseStream.Position = header.PointerToRawData;
header.Magic = m_binaryReader.ReadUInt32 ();
header.Signature = new Guid (m_binaryReader.ReadBytes (16));
header.Age = m_binaryReader.ReadUInt32 ();
header.FileName = ReadZeroTerminatedString ();
m_binaryReader.BaseStream.Position = pos;
}
string ReadZeroTerminatedString ()
{
StringBuilder sb = new StringBuilder ();
while (true) {
byte chr = m_binaryReader.ReadByte ();
if (chr == 0)
break;
sb.Append ((char) chr);
}
return sb.ToString ();
}
public override void VisitImportTable (ImportTable it)
{
if (m_image.PEOptionalHeader.DataDirectories.ImportTable.VirtualAddress == RVA.Zero)
return;
SetPositionToAddress (m_image.PEOptionalHeader.DataDirectories.ImportTable.VirtualAddress);
it.ImportLookupTable = ReadRVA ();
it.DateTimeStamp = m_binaryReader.ReadUInt32 ();
it.ForwardChain = m_binaryReader.ReadUInt32 ();
it.Name = ReadRVA ();
it.ImportAddressTable = ReadRVA ();
}
public override void VisitImportLookupTable (ImportLookupTable ilt)
{
if (m_image.ImportTable.ImportLookupTable == RVA.Zero)
return;
SetPositionToAddress (m_image.ImportTable.ImportLookupTable);
ilt.HintNameRVA = ReadRVA ();
}
public override void VisitHintNameTable (HintNameTable hnt)
{
if (m_image.ImportAddressTable.HintNameTableRVA == RVA.Zero)
return;
if ((m_image.ImportAddressTable.HintNameTableRVA & 0x80000000) != 0)
return;
SetPositionToAddress (m_image.ImportAddressTable.HintNameTableRVA);
hnt.Hint = m_binaryReader.ReadUInt16 ();
byte [] bytes = m_binaryReader.ReadBytes (11);
hnt.RuntimeMain = Encoding.ASCII.GetString (bytes, 0, bytes.Length);
SetPositionToAddress (m_image.ImportTable.Name);
bytes = m_binaryReader.ReadBytes (11);
hnt.RuntimeLibrary = Encoding.ASCII.GetString (bytes, 0, bytes.Length);
SetPositionToAddress (m_image.PEOptionalHeader.StandardFields.EntryPointRVA);
hnt.EntryPoint = m_binaryReader.ReadUInt16 ();
hnt.RVA = ReadRVA ();
}
public override void VisitExportTable (ExportTable et)
{
SetPositionToAddress (m_image.PEOptionalHeader.DataDirectories.ExportTable.VirtualAddress);
et.Characteristics = m_binaryReader.ReadUInt32 ();
et.TimeDateStamp = m_binaryReader.ReadUInt32 ();
et.MajorVersion = m_binaryReader.ReadUInt16 ();
et.MinorVersion = m_binaryReader.ReadUInt16 ();
//et.Name =
m_binaryReader.ReadUInt32 ();
et.Base = m_binaryReader.ReadUInt32 ();
et.NumberOfFunctions = m_binaryReader.ReadUInt32 ();
et.NumberOfNames = m_binaryReader.ReadUInt32 ();
et.AddressOfFunctions = m_binaryReader.ReadUInt32 ();
et.AddressOfNames = m_binaryReader.ReadUInt32 ();
et.AddressOfNameOrdinals = m_binaryReader.ReadUInt32 ();
et.AddressesOfFunctions = ReadArrayOfRVA (et.AddressOfFunctions, et.NumberOfFunctions);
et.AddressesOfNames = ReadArrayOfRVA (et.AddressOfNames, et.NumberOfNames);
et.NameOrdinals = ReadArrayOfUInt16 (et.AddressOfNameOrdinals, et.NumberOfNames);
et.Names = new string [et.NumberOfFunctions];
for (int i = 0; i < et.NumberOfFunctions; i++) {
if (et.AddressesOfFunctions [i] == 0)
continue;
et.Names [i] = ReadFunctionName (et, i);
}
}
string ReadFunctionName (ExportTable et, int index)
{
for (int i = 0; i < et.NumberOfNames; i++) {
if (et.NameOrdinals [i] != index)
continue;
SetPositionToAddress (et.AddressesOfNames [i]);
return ReadZeroTerminatedString ();
}
return string.Empty;
}
ushort [] ReadArrayOfUInt16 (RVA position, uint length)
{
if (position == RVA.Zero)
return new ushort [0];
SetPositionToAddress (position);
ushort [] array = new ushort [length];
for (int i = 0; i < length; i++)
array [i] = m_binaryReader.ReadUInt16 ();
return array;
}
RVA [] ReadArrayOfRVA (RVA position, uint length)
{
if (position == RVA.Zero)
return new RVA [0];
SetPositionToAddress (position);
RVA [] addresses = new RVA [length];
for (int i = 0; i < length; i++)
addresses [i] = m_binaryReader.ReadUInt32 ();
return addresses;
}
public override void TerminateImage(Image img)
{
m_binaryReader.Close ();
try {
ResourceReader resReader = new ResourceReader (img);
img.ResourceDirectoryRoot = resReader.Read ();
} catch {
img.ResourceDirectoryRoot = null;
}
}
}
}
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