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/*!
PE headers.
 */

use std::slice;
use std::ops::Range;

use super::Pe;
use super::image::*;

pub use crate::wrap::sections::*;

/// Describes the PE headers.
#[derive(Copy, Clone)]
pub struct Headers<P> {
	pe: P,
}

impl<'a, P: Pe<'a>> Headers<P> {
	pub(crate) fn new(pe: P) -> Headers<P> {
		Headers { pe }
	}
	/// Gets the PE instance.
	pub fn pe(&self) -> P {
		self.pe
	}
	/// Gets the PE headers as a byte slice.
	pub fn image(&self) -> &'a [u8] {
		unsafe { self.pe.image().get_unchecked(..self.pe.optional_header().SizeOfHeaders as usize) }
	}
	/// Calculates the optional header's CheckSum.
	pub fn check_sum(&self) -> u32 {
		let image = self.pe.image();
		let opt_header_checksum_offset = {
			use dataview::Pod;
			let value = IMAGE_NT_HEADERS::zeroed();
			&value.OptionalHeader.CheckSum as *const _ as usize - &value as *const _ as usize
		};
		let check_sum_position = (self.pe.dos_header().e_lfanew as usize + opt_header_checksum_offset) / 4;
		let dwords = unsafe { slice::from_raw_parts(image.as_ptr() as *const u32, image.len() / 4) };
		let mut check_sum = 0u64;
		for i in 0..dwords.len() {
			if i == check_sum_position {
				continue;
			}
			let dw = dwords[i];
			check_sum = (check_sum & 0xffffffff) + dw as u64 + (check_sum >> 32);
			if check_sum > 0xffffffff {
				check_sum = (check_sum & 0xffffffff) + (check_sum >> 32);
			}
		}
		check_sum = (check_sum & 0xffff) + (check_sum >> 16);
		check_sum = check_sum + (check_sum >> 16);
		check_sum = check_sum & 0xffff;

		check_sum += image.len() as u64;

		check_sum as u32
	}
	/// Gets the code range from the optional header.
	pub fn code_range(&self) -> Range<Rva> {
		let optional_header = self.pe.optional_header();
		optional_header.BaseOfCode..u32::wrapping_add(optional_header.BaseOfCode, optional_header.SizeOfCode)
	}
	/// Gets the full image range excluding the PE headers.
	pub fn image_range(&self) -> Range<Rva> {
		let optional_header = self.pe.optional_header();
		optional_header.SizeOfHeaders..optional_header.SizeOfImage
	}
}

/*
	"headers": {
		"DosHeader": { .. }
		"NtHeaders": {
			"Signature": ..,
			"FileHeader": { .. }
			"OptionalHeader": { .. }
		}
		"DataDirectory": [ .. ]
		"SectionHeaders": [ .. ]
		"details": {
			"DosHeader.e_magic": "MZ",
			"NtHeaders.Signature": "PE",
			"FileHeader.Machine": "AMD",
			"FileHeader.Characteristics": [],
			"OptionalHeader.Magic": "PE32+",
			"DataDirectory.Names": ["Exports", "Imports", ..],
			"DataDirectory.Sections": [1, 1, ..],
			"SectionHeaders.Characteristics": [["executable", "read", "write"], ["read"], ["read", "write"]],
		}
	}
*/

#[cfg(feature = "serde")]
mod serde {
	use crate::util::serde_helper::*;
	use crate::stringify;
	use super::{Pe, Headers};

	impl<'a, P: Pe<'a>> Serialize for Headers<P> {
		fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
			let mut state = serializer.serialize_struct("Headers", 5)?;
			state.serialize_field("DosHeader", self.pe.dos_header())?;
			state.serialize_field("NtHeaders", self.pe.nt_headers())?;
			state.serialize_field("DataDirectory", self.pe.data_directory())?;
			state.serialize_field("SectionHeaders", self.pe.section_headers())?;
			state.serialize_field("details", &Details { pe: self.pe })?;
			state.end()
		}
	}

	struct Details<P> { pe: P }
	impl<'a, P: Pe<'a>> Serialize for Details<P> {
		fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
			let mut state = serializer.serialize_struct("Details", 11)?;

			state.serialize_field("DosHeader.e_magic", "MZ")?;
			state.serialize_field("NtHeaders.Signature", "PE")?;

			let file_header = self.pe.file_header();
			state.serialize_field("FileHeader.Machine", &stringify::Machine(file_header.Machine).to_str())?;
			state.serialize_field("FileHeader.Characteristics", &SerdeIter(stringify::FileChars(file_header.Characteristics).to_strs()))?;

			let optional_header = self.pe.optional_header();
			state.serialize_field("OptionalHeader.Magic", &stringify::OptionalMagic(optional_header.Magic).to_str())?;
			state.serialize_field("OptionalHeader.CheckSum", &Headers { pe: self.pe }.check_sum())?;
			state.serialize_field("OptionalHeader.Subsystem", &stringify::Subsystem(optional_header.Subsystem).to_str())?;
			state.serialize_field("OptionalHeader.DllCharacteristics", &SerdeIter(stringify::DllChars(optional_header.DllCharacteristics).to_strs()))?;

			let data_directory_names = (0..self.pe.data_directory().len()).map(stringify::DirectoryEntry).map(stringify::DirectoryEntry::to_str);
			state.serialize_field("DataDirectory.Names", &SerdeIter(data_directory_names))?;

			let data_directory_sects = self.pe.data_directory().iter().map(|dd| {
				self.pe.section_headers().iter().position(|&sect| dd.VirtualAddress >= sect.VirtualAddress && dd.VirtualAddress < sect.VirtualAddress + sect.VirtualSize)
			});
			state.serialize_field("DataDirectory.Sections", &SerdeIter(data_directory_sects))?;

			let sections_chars = self.pe.section_headers().iter().map(|sect| {
				let section_chars = sect.Characteristics;
				SerdeIter(stringify::SectionChars(section_chars).to_strs())
			});
			state.serialize_field("SectionHeaders.Characteristics", &SerdeIter(sections_chars))?;

			state.end()
		}
	}
}