public ElfProgramHeader(Reader reader, long headerPositon, long fileOffset, bool virt = false)
{
_reader = reader;
_header = _reader.Read <ELFProgramHeader64>(headerPositon);
if (virt && _header.Type == ELFProgramHeaderType.Load)
{
AddressSpace = new RelativeAddressSpace(reader.DataSource, "ProgramHeader", _header.VirtualAddress, _header.VirtualSize);
}
else
{
AddressSpace = new RelativeAddressSpace(reader.DataSource, "ProgramHeader", fileOffset + _header.FileOffset, _header.FileSize);
}
}
public int Read(long position, byte[] buffer, int bufferOffset, int count)
{
for (int i = 0; i < _segments.Count; i++)
{
ref ELFProgramHeader64 header = ref _segments[i].RefHeader;
// FileSize == 0 means the segment isn't backed by any data
if (header.FileSize > 0 && header.VirtualAddress <= position && position + count <= header.VirtualAddress + header.VirtualSize)
{
long segmentOffset = position - header.VirtualAddress;
int fileBytes = (int)Math.Min(count, header.FileSize);
long fileOffset = header.FileOffset + segmentOffset;
int bytesRead = _addressSpace.Read(fileOffset, buffer, bufferOffset, fileBytes);
//zero the rest of the buffer if it is in the virtual address space but not the physical address space
if (bytesRead == fileBytes && fileBytes != count)
{
Array.Clear(buffer, bufferOffset + fileBytes, count - fileBytes);
bytesRead = count;
}
return(bytesRead);
}
}