private static UInt32 CalculateChecksum(byte[] PEFile)
{
UInt32 Checksum = 0;
UInt32 Hi;
// Clear file checksum
ByteOperations.WriteUInt32(PEFile, GetChecksumOffset(PEFile), 0);
for (UInt32 i = 0; i < ((UInt32)PEFile.Length & 0xfffffffe); i += 2)
{
Checksum += ByteOperations.ReadUInt16(PEFile, i);
Hi = Checksum >> 16;
if (Hi != 0)
{
Checksum = Hi + (Checksum & 0xFFFF);
}
}
if ((PEFile.Length % 2) != 0)
{
Checksum += (UInt32)ByteOperations.ReadUInt8(PEFile, (UInt32)PEFile.Length - 1);
Hi = Checksum >> 16;
if (Hi != 0)
{
Checksum = Hi + (Checksum & 0xFFFF);
}
}
Checksum += (UInt32)PEFile.Length;
// Write file checksum
ByteOperations.WriteUInt32(PEFile, GetChecksumOffset(PEFile), Checksum);
return(Checksum);
}
internal UInt32 CalculateChecksum()
{
UInt32 Checksum = 0;
UInt32 Hi;
// Clear file checksum
// ByteOperations.WriteUInt32(PEFile, GetChecksumOffset(), 0);
UInt32 ChecksumOffset = GetChecksumOffset();
for (UInt32 i = 0; i < ((UInt32)Buffer.Length & 0xfffffffe); i += 2)
{
if ((i < ChecksumOffset) || (i >= (ChecksumOffset + 4)))
{
Checksum += ByteOperations.ReadUInt16(Buffer, i);
}
Hi = Checksum >> 16;
if (Hi != 0)
{
Checksum = Hi + (Checksum & 0xFFFF);
}
}
if ((Buffer.Length % 2) != 0)
{
Checksum += (UInt32)ByteOperations.ReadUInt8(Buffer, (UInt32)Buffer.Length - 1);
Hi = Checksum >> 16;
if (Hi != 0)
{
Checksum = Hi + (Checksum & 0xFFFF);
}
}
Checksum += (UInt32)Buffer.Length;
// Write file checksum
// ByteOperations.WriteUInt32(Buffer, GetChecksumOffset(), Checksum);
return(Checksum);
}