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/*!
PE file.
*/

use std::prelude::v1::*;

use crate::Result;

use super::pe::validate_headers;
use super::{Align, Pe, PeObject};

/// View into an unmapped PE file.
#[derive(Copy, Clone)]
pub struct PeFile<'a> {
	image: &'a [u8],
}

impl<'a> PeFile<'a> {
	/// Constructs a file view from a byte slice.
	///
	/// # Errors
	///
	/// * [`Bounds`](../enum.Error.html#variant.Bounds):
	///   The byte slice is too small to fit the PE headers.
	///
	/// * [`Misaligned`](../enum.Error.html#variant.Misaligned):
	///   The minimum alignment of 4 is not satisfied.
	///
	/// * [`BadMagic`](../enum.Error.html#variant.BadMagic):
	///   This is not a PE file.
	///
	/// * [`PeMagic`](../enum.Error.html#variant.PeMagic):
	///   Trying to parse a PE32 file with the PE32+ parser and vice versa.
	///
	/// * [`Insanity`](../enum.Error.html#variant.Insanity):
	///   Reasonable limits on `e_lfanew`, `SizeOfHeaders` or `NumberOfSections` are exceeded.
	pub fn from_bytes<T: AsRef<[u8]> + ?Sized>(image: &'a T) -> Result<PeFile<'a>> {
		let image = image.as_ref();
		let _ = validate_headers(image)?;
		Ok(PeFile { image })
	}
	/// Converts the file to section alignment.
	pub fn to_view(self) -> Vec<u8> {
		let (sizeof_headers, sizeof_image) = {
			let optional_header = self.optional_header();
			(optional_header.SizeOfHeaders, optional_header.SizeOfImage)
		};

		// Zero fill the underlying image
		let mut vec = vec![0u8; sizeof_image as usize];

		// Start by copying the headers
		let image = self.image();
		unsafe {
			// Validated by constructor
			let dest_headers = vec.get_unchecked_mut(..sizeof_headers as usize);
			let src_headers = image.get_unchecked(..sizeof_headers as usize);
			dest_headers.copy_from_slice(src_headers);
		}

		// Copy the section file data
		for section in self.section_headers() {
			let dest = vec.get_mut(section.VirtualAddress as usize..u32::wrapping_add(section.VirtualAddress, section.VirtualSize) as usize);
			let src = image.get(section.PointerToRawData as usize..u32::wrapping_add(section.PointerToRawData, section.SizeOfRawData) as usize);
			// Skip invalid sections...
			if let (Some(dest), Some(src)) = (dest, src) {
				dest.copy_from_slice(src);
			}
		}

		vec
	}
}

//----------------------------------------------------------------

unsafe impl<'a> Pe<'a> for PeFile<'a> {}

unsafe impl<'a> PeObject<'a> for PeFile<'a> {
	fn image(&self) -> &'a [u8] {
		self.image
	}
	fn align(&self) -> Align {
		Align::File
	}
	#[cfg(feature = "serde")]
	fn serde_name(&self) -> &'static str {
		"PeFile"
	}
}

//----------------------------------------------------------------

#[cfg(feature = "serde")]
impl<'a> serde::Serialize for PeFile<'a> {
	fn serialize<S: serde::Serializer>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error> {
		super::pe::serialize_pe(*self, serializer)
	}
}

//----------------------------------------------------------------

#[test]
fn from_byte_slice() {
	assert!(match PeFile::from_bytes(&[]) { Err(crate::Error::Bounds) => true, _ => false });
}