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use std::cmp;
use error::{Error, Result};
use super::image::*;
use super::pe::validate_headers;
use super::{Align, Pe};
#[derive(Copy, Clone)]
pub struct PeFile<'a> {
image: &'a [u8],
}
impl<'a> PeFile<'a> {
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 })
}
pub fn to_view(self) -> Vec<u8> {
let (sizeof_headers, sizeof_image) = {
let optional_header = self.optional_header();
(optional_header.SizeOfHeaders, optional_header.SizeOfImage)
};
let mut vec = vec![0u8; sizeof_image as usize];
let image = self.image();
unsafe {
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);
}
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);
if let (Some(dest), Some(src)) = (dest, src) {
dest.copy_from_slice(src);
}
}
vec
}
fn range_to_slice(&self, rva: Rva, min_size_of: usize) -> Result<&'a [u8]> {
for it in self.section_headers() {
#[allow(non_snake_case)]
let VirtualEnd = it.VirtualAddress.wrapping_add(cmp::max(it.VirtualSize, it.SizeOfRawData));
if it.VirtualAddress <= rva && rva < VirtualEnd { let section_range = it.PointerToRawData as usize..it.PointerToRawData.wrapping_add(it.SizeOfRawData) as usize;
let section_bytes = self.image.get(section_range).ok_or(Error::Invalid)?;
let section_offset = (rva - it.VirtualAddress) as usize;
return match section_bytes.get(section_offset..) {
Some(bytes) if bytes.len() >= min_size_of => Ok(bytes),
_ => Err(if min_size_of > (VirtualEnd - rva) as usize { Error::Bounds } else { Error::ZeroFill }),
};
}
}
Err(Error::Bounds)
}
#[inline(never)]
fn slice_impl(self, rva: Rva, min_size_of: usize, align_of: usize) -> Result<&'a [u8]> {
debug_assert!(align_of != 0 && align_of & (align_of - 1) == 0);
if rva == 0 {
Err(Error::Null)
}
else if usize::wrapping_add(self.image.as_ptr() as usize, rva as usize) & (align_of - 1) != 0 {
Err(Error::Misaligned)
}
else {
self.range_to_slice(rva, min_size_of)
}
}
#[inline(never)]
fn read_impl(self, va: Va, min_size_of: usize, align_of: usize) -> Result<&'a [u8]> {
debug_assert!(align_of != 0 && align_of & (align_of - 1) == 0);
let (image_base, size_of_image) = {
let optional_header = self.optional_header();
(optional_header.ImageBase, optional_header.SizeOfImage)
};
if va == 0 {
Err(Error::Null)
}
else if va < image_base || va - image_base > size_of_image as Va {
Err(Error::Bounds)
}
else {
let rva = (va - image_base) as Rva;
if usize::wrapping_add(self.image.as_ptr() as usize, rva as usize) & (align_of - 1) != 0 {
Err(Error::Misaligned)
}
else {
self.range_to_slice(rva, min_size_of)
}
}
}
}
unsafe impl<'a> Pe<'a> for PeFile<'a> {
fn image(&self) -> &'a [u8] {
self.image
}
fn align(&self) -> Align {
Align::File
}
fn slice(&self, rva: Rva, min_size_of: usize, align_of: usize) -> Result<&'a [u8]> {
self.slice_impl(rva, min_size_of, align_of)
}
fn read(&self, va: Va, min_size_of: usize, align_of: usize) -> Result<&'a [u8]> {
self.read_impl(va, min_size_of, align_of)
}
#[cfg(feature = "serde")]
const SERDE_NAME: &'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)
}
}
#[cfg(test)]
mod tests {
use error::Error;
use super::PeFile;
#[test]
fn from_byte_slice() {
assert!(match PeFile::from_bytes(&[]) { Err(Error::Bounds) => true, _ => false });
}
}