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use alloc::vec::Vec;
use core::fmt::Debug;
use crate::read::{
self, Architecture, Export, FileFlags, Import, NoDynamicRelocationIterator, Object, ObjectKind,
ObjectSection, ReadError, ReadRef, Result, SectionIndex, SymbolIndex,
};
use crate::{pe, LittleEndian as LE, Pod};
use super::{
CoffComdat, CoffComdatIterator, CoffSection, CoffSectionIterator, CoffSegment,
CoffSegmentIterator, CoffSymbol, CoffSymbolIterator, CoffSymbolTable, ImageSymbol,
SectionTable, SymbolTable,
};
/// The common parts of `PeFile` and `CoffFile`.
#[derive(Debug)]
pub(crate) struct CoffCommon<'data, R: ReadRef<'data>, Coff: CoffHeader = pe::ImageFileHeader> {
pub(crate) sections: SectionTable<'data>,
pub(crate) symbols: SymbolTable<'data, R, Coff>,
pub(crate) image_base: u64,
}
/// A COFF bigobj object file with 32-bit section numbers.
pub type CoffBigFile<'data, R = &'data [u8]> = CoffFile<'data, R, pe::AnonObjectHeaderBigobj>;
/// A COFF object file.
#[derive(Debug)]
pub struct CoffFile<'data, R: ReadRef<'data> = &'data [u8], Coff: CoffHeader = pe::ImageFileHeader>
{
pub(super) header: &'data Coff,
pub(super) common: CoffCommon<'data, R, Coff>,
pub(super) data: R,
}
impl<'data, R: ReadRef<'data>, Coff: CoffHeader> CoffFile<'data, R, Coff> {
/// Parse the raw COFF file data.
pub fn parse(data: R) -> Result<Self> {
let mut offset = 0;
let header = Coff::parse(data, &mut offset)?;
let sections = header.sections(data, offset)?;
let symbols = header.symbols(data)?;
Ok(CoffFile {
header,
common: CoffCommon {
sections,
symbols,
image_base: 0,
},
data,
})
}
}
impl<'data, R: ReadRef<'data>, Coff: CoffHeader> read::private::Sealed
for CoffFile<'data, R, Coff>
{
}
impl<'data, 'file, R, Coff> Object<'data, 'file> for CoffFile<'data, R, Coff>
where
'data: 'file,
R: 'file + ReadRef<'data>,
Coff: CoffHeader,
{
type Segment = CoffSegment<'data, 'file, R, Coff>;
type SegmentIterator = CoffSegmentIterator<'data, 'file, R, Coff>;
type Section = CoffSection<'data, 'file, R, Coff>;
type SectionIterator = CoffSectionIterator<'data, 'file, R, Coff>;
type Comdat = CoffComdat<'data, 'file, R, Coff>;
type ComdatIterator = CoffComdatIterator<'data, 'file, R, Coff>;
type Symbol = CoffSymbol<'data, 'file, R, Coff>;
type SymbolIterator = CoffSymbolIterator<'data, 'file, R, Coff>;
type SymbolTable = CoffSymbolTable<'data, 'file, R, Coff>;
type DynamicRelocationIterator = NoDynamicRelocationIterator;
fn architecture(&self) -> Architecture {
match self.header.machine() {
pe::IMAGE_FILE_MACHINE_ARMNT => Architecture::Arm,
pe::IMAGE_FILE_MACHINE_ARM64 => Architecture::Aarch64,
pe::IMAGE_FILE_MACHINE_I386 => Architecture::I386,
pe::IMAGE_FILE_MACHINE_AMD64 => Architecture::X86_64,
_ => Architecture::Unknown,
}
}
#[inline]
fn is_little_endian(&self) -> bool {
true
}
#[inline]
fn is_64(&self) -> bool {
// Windows COFF is always 32-bit, even for 64-bit architectures. This could be confusing.
false
}
fn kind(&self) -> ObjectKind {
ObjectKind::Relocatable
}
fn segments(&'file self) -> CoffSegmentIterator<'data, 'file, R, Coff> {
CoffSegmentIterator {
file: self,
iter: self.common.sections.iter(),
}
}
fn section_by_name_bytes(
&'file self,
section_name: &[u8],
) -> Option<CoffSection<'data, 'file, R, Coff>> {
self.sections()
.find(|section| section.name_bytes() == Ok(section_name))
}
fn section_by_index(
&'file self,
index: SectionIndex,
) -> Result<CoffSection<'data, 'file, R, Coff>> {
let section = self.common.sections.section(index.0)?;
Ok(CoffSection {
file: self,
index,
section,
})
}
fn sections(&'file self) -> CoffSectionIterator<'data, 'file, R, Coff> {
CoffSectionIterator {
file: self,
iter: self.common.sections.iter().enumerate(),
}
}
fn comdats(&'file self) -> CoffComdatIterator<'data, 'file, R, Coff> {
CoffComdatIterator {
file: self,
index: 0,
}
}
fn symbol_by_index(
&'file self,
index: SymbolIndex,
) -> Result<CoffSymbol<'data, 'file, R, Coff>> {
let symbol = self.common.symbols.symbol(index.0)?;
Ok(CoffSymbol {
file: &self.common,
index,
symbol,
})
}
fn symbols(&'file self) -> CoffSymbolIterator<'data, 'file, R, Coff> {
CoffSymbolIterator {
file: &self.common,
index: 0,
}
}
#[inline]
fn symbol_table(&'file self) -> Option<CoffSymbolTable<'data, 'file, R, Coff>> {
Some(CoffSymbolTable { file: &self.common })
}
fn dynamic_symbols(&'file self) -> CoffSymbolIterator<'data, 'file, R, Coff> {
CoffSymbolIterator {
file: &self.common,
// Hack: don't return any.
index: self.common.symbols.len(),
}
}
#[inline]
fn dynamic_symbol_table(&'file self) -> Option<CoffSymbolTable<'data, 'file, R, Coff>> {
None
}
#[inline]
fn dynamic_relocations(&'file self) -> Option<NoDynamicRelocationIterator> {
None
}
#[inline]
fn imports(&self) -> Result<Vec<Import<'data>>> {
// TODO: this could return undefined symbols, but not needed yet.
Ok(Vec::new())
}
#[inline]
fn exports(&self) -> Result<Vec<Export<'data>>> {
// TODO: this could return global symbols, but not needed yet.
Ok(Vec::new())
}
fn has_debug_symbols(&self) -> bool {
self.section_by_name(".debug_info").is_some()
}
fn relative_address_base(&self) -> u64 {
0
}
#[inline]
fn entry(&self) -> u64 {
0
}
fn flags(&self) -> FileFlags {
FileFlags::Coff {
characteristics: self.header.characteristics(),
}
}
}
/// Read the `class_id` field from an anon object header.
///
/// This can be used to determine the format of the header.
pub fn anon_object_class_id<'data, R: ReadRef<'data>>(data: R) -> Result<pe::ClsId> {
let header = data
.read_at::<pe::AnonObjectHeader>(0)
.read_error("Invalid anon object header size or alignment")?;
Ok(header.class_id)
}
/// A trait for generic access to `ImageFileHeader` and `AnonObjectHeaderBigobj`.
#[allow(missing_docs)]
pub trait CoffHeader: Debug + Pod {
type ImageSymbol: ImageSymbol;
type ImageSymbolBytes: Debug + Pod;
/// Return true if this type is `AnonObjectHeaderBigobj`.
///
/// This is a property of the type, not a value in the header data.
fn is_type_bigobj() -> bool;
fn machine(&self) -> u16;
fn number_of_sections(&self) -> u32;
fn pointer_to_symbol_table(&self) -> u32;
fn number_of_symbols(&self) -> u32;
fn characteristics(&self) -> u16;
/// Read the file header.
///
/// `data` must be the entire file data.
/// `offset` must be the file header offset. It is updated to point after the optional header,
/// which is where the section headers are located.
fn parse<'data, R: ReadRef<'data>>(data: R, offset: &mut u64) -> read::Result<&'data Self>;
/// Read the section table.
///
/// `data` must be the entire file data.
/// `offset` must be after the optional file header.
#[inline]
fn sections<'data, R: ReadRef<'data>>(
&self,
data: R,
offset: u64,
) -> read::Result<SectionTable<'data>> {
SectionTable::parse(self, data, offset)
}
/// Read the symbol table and string table.
///
/// `data` must be the entire file data.
#[inline]
fn symbols<'data, R: ReadRef<'data>>(
&self,
data: R,
) -> read::Result<SymbolTable<'data, R, Self>> {
SymbolTable::parse(self, data)
}
}
impl CoffHeader for pe::ImageFileHeader {
type ImageSymbol = pe::ImageSymbol;
type ImageSymbolBytes = pe::ImageSymbolBytes;
fn is_type_bigobj() -> bool {
false
}
fn machine(&self) -> u16 {
self.machine.get(LE)
}
fn number_of_sections(&self) -> u32 {
self.number_of_sections.get(LE).into()
}
fn pointer_to_symbol_table(&self) -> u32 {
self.pointer_to_symbol_table.get(LE)
}
fn number_of_symbols(&self) -> u32 {
self.number_of_symbols.get(LE)
}
fn characteristics(&self) -> u16 {
self.characteristics.get(LE)
}
fn parse<'data, R: ReadRef<'data>>(data: R, offset: &mut u64) -> read::Result<&'data Self> {
let header = data
.read::<pe::ImageFileHeader>(offset)
.read_error("Invalid COFF file header size or alignment")?;
// Skip over the optional header.
*offset = offset
.checked_add(header.size_of_optional_header.get(LE).into())
.read_error("Invalid COFF optional header size")?;
// TODO: maybe validate that the machine is known?
Ok(header)
}
}
impl CoffHeader for pe::AnonObjectHeaderBigobj {
type ImageSymbol = pe::ImageSymbolEx;
type ImageSymbolBytes = pe::ImageSymbolExBytes;
fn is_type_bigobj() -> bool {
true
}
fn machine(&self) -> u16 {
self.machine.get(LE)
}
fn number_of_sections(&self) -> u32 {
self.number_of_sections.get(LE)
}
fn pointer_to_symbol_table(&self) -> u32 {
self.pointer_to_symbol_table.get(LE)
}
fn number_of_symbols(&self) -> u32 {
self.number_of_symbols.get(LE)
}
fn characteristics(&self) -> u16 {
0
}
fn parse<'data, R: ReadRef<'data>>(data: R, offset: &mut u64) -> read::Result<&'data Self> {
let header = data
.read::<pe::AnonObjectHeaderBigobj>(offset)
.read_error("Invalid COFF bigobj file header size or alignment")?;
if header.sig1.get(LE) != pe::IMAGE_FILE_MACHINE_UNKNOWN
|| header.sig2.get(LE) != 0xffff
|| header.version.get(LE) < 2
|| header.class_id != pe::ANON_OBJECT_HEADER_BIGOBJ_CLASS_ID
{
return Err(read::Error("Invalid COFF bigobj header values"));
}
// TODO: maybe validate that the machine is known?
Ok(header)
}
}