public void MoveTo (int rva)
{
if (!IsInSection (rva)) {
code_section = reader.image.GetSectionAtVirtualAddress ((uint) rva);
Reset (code_section.Data);
}
base.position = rva - (int) code_section.VirtualAddress;
}
public uint ResolveVirtualAddressInSection (RVA rva, Section section)
{
return rva + section.PointerToRawData - section.VirtualAddress;
}
public CodeReader (Section section, MetadataReader reader)
: base (section.Data)
{
this.code_section = section;
this.reader = reader;
}
public StringHeap (Section section, uint start, uint size)
: base (section, start, size)
{
}
public GuidHeap (Section section, uint start, uint size)
: base (section, start, size)
{
}
protected Heap (Section section, uint offset, uint size)
{
this.Section = section;
this.Offset = offset;
this.Size = size;
}
public BlobHeap (Section section, uint start, uint size)
: base (section, start, size)
{
}
void ReadMetadataStream (Section section)
{
// Offset 4
uint start = metadata.VirtualAddress - section.VirtualAddress + ReadUInt32 (); // relative to the section start
// Size 4
uint size = ReadUInt32 ();
var name = ReadAlignedString (16);
switch (name) {
case "#~":
case "#-":
image.TableHeap = new TableHeap (section, start, size);
break;
case "#Strings":
image.StringHeap = new StringHeap (section, start, size);
break;
case "#Blob":
image.BlobHeap = new BlobHeap (section, start, size);
break;
case "#GUID":
image.GuidHeap = new GuidHeap (section, start, size);
break;
case "#US":
image.UserStringHeap = new UserStringHeap (section, start, size);
break;
}
}
public TableHeap (Section section, uint start, uint size)
: base (section, start, size)
{
}
void ReadSections (ushort count)
{
var sections = new Section [count];
for (int i = 0; i < count; i++) {
var section = new Section ();
// Name
section.Name = ReadZeroTerminatedString (8);
// VirtualSize 4
Advance (4);
// VirtualAddress 4
section.VirtualAddress = ReadUInt32 ();
// SizeOfRawData 4
section.SizeOfRawData = ReadUInt32 ();
// PointerToRawData 4
section.PointerToRawData = ReadUInt32 ();
// PointerToRelocations 4
// PointerToLineNumbers 4
// NumberOfRelocations 2
// NumberOfLineNumbers 2
// Characteristics 4
Advance (16);
sections [i] = section;
ReadSectionData (section);
}
image.Sections = sections;
}
void ReadSectionData (Section section)
{
var position = BaseStream.Position;
MoveTo (section.PointerToRawData);
var length = (int) section.SizeOfRawData;
var data = new byte [length];
int offset = 0, read;
while ((read = Read (data, offset, length - offset)) > 0)
offset += read;
section.Data = data;
BaseStream.Position = position;
}
void PrepareSection (Section section)
{
MoveTo (section.PointerToRawData);
const int buffer_size = 4096;
if (section.SizeOfRawData <= buffer_size) {
Write (new byte [section.SizeOfRawData]);
MoveTo (section.PointerToRawData);
return;
}
var written = 0;
var buffer = new byte [buffer_size];
while (written != section.SizeOfRawData) {
var write_size = System.Math.Min((int) section.SizeOfRawData - written, buffer_size);
Write (buffer, 0, write_size);
written += write_size;
}
MoveTo (section.PointerToRawData);
}
void MoveToRVA (Section section, RVA rva)
{
BaseStream.Seek (section.PointerToRawData + rva - section.VirtualAddress, SeekOrigin.Begin);
}
void WriteSection (Section section, uint characteristics)
{
var name = new byte [8];
var sect_name = section.Name;
for (int i = 0; i < sect_name.Length; i++)
name [i] = (byte) sect_name [i];
WriteBytes (name);
WriteUInt32 (section.VirtualSize);
WriteUInt32 (section.VirtualAddress);
WriteUInt32 (section.SizeOfRawData);
WriteUInt32 (section.PointerToRawData);
WriteUInt32 (0); // PointerToRelocations
WriteUInt32 (0); // PointerToLineNumbers
WriteUInt16 (0); // NumberOfRelocations
WriteUInt16 (0); // NumberOfLineNumbers
WriteUInt32 (characteristics);
}
Section CreateSection (string name, uint size, Section previous)
{
return new Section {
Name = name,
VirtualAddress = previous != null
? previous.VirtualAddress + Align (previous.VirtualSize, section_alignment)
: text_rva,
VirtualSize = size,
PointerToRawData = previous != null
? previous.PointerToRawData + previous.SizeOfRawData
: Align (GetHeaderSize (), file_alignment),
SizeOfRawData = Align (size, file_alignment)
};
}
void BuildSections ()
{
var has_win32_resources = win32_resources != null;
if (has_win32_resources)
sections++;
text = CreateSection (".text", text_map.GetLength (), null);
var previous = text;
if (has_win32_resources) {
rsrc = CreateSection (".rsrc", (uint) win32_resources.length, previous);
PatchWin32Resources (win32_resources);
previous = rsrc;
}
if (has_reloc)
reloc = CreateSection (".reloc", 12u, previous);
}
