public Image(string name)
{
this.name = name;
open = false;
reader = null;
mdRoot = null;
dosHdr = new DOSHeader();
coffHdr = new COFFHeader();
peHdr = new PEHeader();
corHdr = new CorHeader();
sections = new Hashtable();
sectionsPos = -1;
}
/// <summary>
/// </summary>
public void ReadHeaders()
{
if (!open)
{
throw new Exception("You must open image before trying to read it.");
}
dosHdr.Read(reader);
reader.BaseStream.Position = dosHdr.Lfanew;
ExeSignature peSig = (ExeSignature)reader.ReadUInt16();
if (peSig != ExeSignature.NT)
{
throw new Exception("Invalid image format: cannot find PE signature.");
}
peSig = (ExeSignature)reader.ReadUInt16();
if (peSig != ExeSignature.NT2)
{
throw new Exception("Invalid image format: cannot find PE signature.");
}
coffHdr.Read(reader);
peHdr.Read(reader);
sectionsPos = reader.BaseStream.Position;
ReadSections();
if (this.IsCLI)
{
reader.BaseStream.Position = RVAToVA(peHdr.CLIHdrDir.virtAddr);
corHdr.Read(reader);
mdRoot = new MetaDataRoot(this);
reader.BaseStream.Position = RVAToVA(corHdr.MetaData.virtAddr);
mdRoot.Read(reader);
}
}
internal MetaDataRoot m_mdr; // MetaData Root table
/*********************************************************************************************************************
* 1) Parse the MetaData Root table.
*
* 2) Initialize the various heaps.
*
* 3) Initialize "m_oldNameHash", "m_classTree", and "m_freeSpaceList".
*
* 4) Initialize the various BitArrays.
*
* 5) Set the total numbers of the elements (types, methods, fields, properties, events, and parameters).
*********************************************************************************************************************/
internal MetaData(ref byte[] buf)
{
int i, ptHeapIndex = -1;
Exception toBeThrown;
m_buffer = buf;
// Ok. Now we can build a reader and a writer over the memory m_buffer.
MemoryStream memStream = new MemoryStream(m_buffer);
BinaryReader reader = new BinaryReader(memStream);
BinaryWriter writer = new BinaryWriter(memStream);
AllHeaders all = new AllHeaders(ref reader);
NTHeader nth = all.m_ntHeader;
SectionHeader[] sh = all.m_sectionHeaders;
#if DEBUG0
Console.WriteLine("Runtime Header Data Directory");
Console.WriteLine("rva: " + nth.m_DataDirectory[14].RVA + "; size: " + nth.m_DataDirectory[14].Size + Environment.NewLine);
Console.WriteLine("offset to MetaData section: " + (long)(nth.m_DataDirectory[14].RVA + 8));
#endif
// Read the RVA of the physical MetaData section from the Runtime Header Data Directory.
reader.BaseStream.Seek((long)(nth.m_DataDirectory[14].RVA + 8), SeekOrigin.Begin);
m_startPos = reader.ReadUInt64();
// Theoretically, startPos can be 64 bit long, but in practice, 32 bits are enough.
// TODO : Check the docs. The following assertion will fail.
// Debug.Assert((startPos >> 32) == 0);
m_startPos = m_startPos & 0xffffffff; // use the least significant 4 bytes as the offset
m_mdr = new MetaDataRoot(ref reader, ref m_buffer, m_startPos);
// We need to initialize the #Strings heap and the #Blob heap before dealing with the #~ heap.
for (i = 0; i < m_mdr.m_numStreams; i++)
{
if (m_mdr.m_streamHeaders[i].name.Equals("#Strings\0"))
{
m_strHeap = new StringHeap(ref m_buffer, m_startPos + m_mdr.m_streamHeaders[i].offset, m_mdr.m_streamHeaders[i].size);
}
else if (m_mdr.m_streamHeaders[i].name.Equals("#Blob\0"))
{
m_blobHeap = new BlobHeap(ref m_buffer, m_startPos + m_mdr.m_streamHeaders[i].offset, m_mdr.m_streamHeaders[i].size);
}
else if (m_mdr.m_streamHeaders[i].name.Equals("#~\0") || m_mdr.m_streamHeaders[i].name.Equals("#-\0"))
{
ptHeapIndex = i;
}
}
if (ptHeapIndex != -1)
{
m_heap = new PTHeap(ref reader, ref writer, ref m_strHeap, m_startPos + m_mdr.m_streamHeaders[ptHeapIndex].offset);
}
else
{
toBeThrown = new InvalidFileFormat("Invalid CIL binary file format.");
throw toBeThrown;
}
}
