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Add PE section table parsing, writing

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This commit is contained in:
Matt Nadareski
2022-11-08 16:31:30 -08:00
parent 760c481d39
commit 6fc03403b4
2 changed files with 185 additions and 50 deletions
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111
BurnOutSharp.Builder/PortableExecutable.cs
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@@ -70,7 +70,7 @@ namespace BurnOutSharp.Builder
#region Optional Header
// Try to parse the optional header
var optionalHeader = ParseOptionalHeader(data, offset, coffFileHeader.SizeOfOptionalHeader);
var optionalHeader = ParseOptionalHeader(data, ref offset, coffFileHeader.SizeOfOptionalHeader);
if (optionalHeader == null)
return null;
@@ -79,6 +79,18 @@ namespace BurnOutSharp.Builder
#endregion
#region Section Table
// Try to parse the section table
var sectionTable = ParseSectionTable(data, offset, coffFileHeader.NumberOfSections);
if (sectionTable == null)
return null;
// Set the section table
executable.SectionTable = sectionTable;
#endregion
// TODO: Finish implementing PE parsing
return executable;
}
@@ -112,7 +124,7 @@ namespace BurnOutSharp.Builder
/// <param name="offset">Offset into the byte array</param>
/// <param name="optionalSize">Size of the optional header</param>
/// <returns>Filled optional header on success, null on error</returns>
private static OptionalHeader ParseOptionalHeader(byte[] data, int offset, int optionalSize)
private static OptionalHeader ParseOptionalHeader(byte[] data, ref int offset, int optionalSize)
{
int initialOffset = offset;
@@ -141,6 +153,7 @@ namespace BurnOutSharp.Builder
optionalHeader.ImageBase_PE32 = data.ReadUInt32(ref offset);
else if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32Plus)
optionalHeader.ImageBase_PE32Plus = data.ReadUInt64(ref offset);
optionalHeader.SectionAlignment = data.ReadUInt32(ref offset);
optionalHeader.FileAlignment = data.ReadUInt32(ref offset);
optionalHeader.MajorOperatingSystemVersion = data.ReadUInt16(ref offset);
optionalHeader.MinorOperatingSystemVersion = data.ReadUInt16(ref offset);
@@ -275,6 +288,47 @@ namespace BurnOutSharp.Builder
return optionalHeader;
}
/// <summary>
/// Parse a byte array into a section table
/// </summary>
/// <param name="data">Byte array to parse</param>
/// <param name="offset">Offset into the byte array</param>
/// <param name="count">Number of section table entries to read</param>
/// <returns>Filled section table on success, null on error</returns>
private static SectionHeader[] ParseSectionTable(byte[] data, int offset, int count)
{
// TODO: Use marshalling here instead of building
var sectionTable = new SectionHeader[count];
for (int i = 0; i < count; i++)
{
var entry = new SectionHeader();
entry.Name = data.ReadBytes(ref offset, 8);
entry.VirtualSize = data.ReadUInt32(ref offset);
entry.VirtualAddress = data.ReadUInt32(ref offset);
entry.SizeOfRawData = data.ReadUInt32(ref offset);
entry.PointerToRawData = data.ReadUInt32(ref offset);
entry.PointerToRelocations = data.ReadUInt32(ref offset);
entry.PointerToLinenumbers = data.ReadUInt32(ref offset);
entry.NumberOfRelocations = data.ReadUInt16(ref offset);
entry.NumberOfLinenumbers = data.ReadUInt16(ref offset);
entry.Characteristics = (SectionFlags)data.ReadUInt32(ref offset);
entry.COFFRelocations = new COFFRelocation[entry.NumberOfRelocations];
for (int j = 0; i < entry.NumberOfRelocations; j++)
{
// TODO: Seek to correct location and read data
}
entry.COFFLineNumbers = new COFFLineNumber[entry.NumberOfRelocations];
for (int j = 0; i < entry.NumberOfRelocations; j++)
{
// TODO: Seek to correct location and read data
}
sectionTable[i] = entry;
}
return sectionTable;
}
#endregion
#region Stream Data
@@ -349,6 +403,18 @@ namespace BurnOutSharp.Builder
#endregion
#region Section Table
// Try to parse the section table
var sectionTable = ParseSectionTable(data, coffFileHeader.NumberOfSections);
if (sectionTable == null)
return null;
// Set the section table
executable.SectionTable = sectionTable;
#endregion
// TODO: Finish implementing PE parsing
return executable;
}
@@ -409,6 +475,7 @@ namespace BurnOutSharp.Builder
optionalHeader.ImageBase_PE32 = data.ReadUInt32();
else if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32Plus)
optionalHeader.ImageBase_PE32Plus = data.ReadUInt64();
optionalHeader.SectionAlignment = data.ReadUInt32();
optionalHeader.FileAlignment = data.ReadUInt32();
optionalHeader.MajorOperatingSystemVersion = data.ReadUInt16();
optionalHeader.MinorOperatingSystemVersion = data.ReadUInt16();
@@ -543,6 +610,46 @@ namespace BurnOutSharp.Builder
return optionalHeader;
}
/// <summary>
/// Parse a Stream into a section table
/// </summary>
/// <param name="data">Stream to parse</param>
/// <param name="count">Number of section table entries to read</param>
/// <returns>Filled section table on success, null on error</returns>
private static SectionHeader[] ParseSectionTable(Stream data, int count)
{
// TODO: Use marshalling here instead of building
var sectionTable = new SectionHeader[count];
for (int i = 0; i < count; i++)
{
var entry = new SectionHeader();
entry.Name = data.ReadBytes(8);
entry.VirtualSize = data.ReadUInt32();
entry.VirtualAddress = data.ReadUInt32();
entry.SizeOfRawData = data.ReadUInt32();
entry.PointerToRawData = data.ReadUInt32();
entry.PointerToRelocations = data.ReadUInt32();
entry.PointerToLinenumbers = data.ReadUInt32();
entry.NumberOfRelocations = data.ReadUInt16();
entry.NumberOfLinenumbers = data.ReadUInt16();
entry.Characteristics = (SectionFlags)data.ReadUInt32();
entry.COFFRelocations = new COFFRelocation[entry.NumberOfRelocations];
for (int j = 0; j < entry.NumberOfRelocations; j++)
{
// TODO: Seek to correct location and read data
}
entry.COFFLineNumbers = new COFFLineNumber[entry.NumberOfLinenumbers];
for (int j = 0; j < entry.NumberOfLinenumbers; j++)
{
// TODO: Seek to correct location and read data
}
sectionTable[i] = entry;
}
return sectionTable;
}
#endregion
}
}