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use core::slice;
use crate::endian::LittleEndian as LE;
use crate::pe;
use crate::read::{Error, ReadError, ReadRef, Result};
use super::{
DelayLoadImportTable, ExportTable, ImportTable, RelocationBlockIterator, ResourceDirectory,
SectionTable,
};
/// The table of data directories in a PE file.
///
/// Returned by [`ImageNtHeaders::parse`](super::ImageNtHeaders::parse).
#[derive(Debug, Clone, Copy)]
pub struct DataDirectories<'data> {
entries: &'data [pe::ImageDataDirectory],
}
impl<'data> DataDirectories<'data> {
/// Parse the data directory table.
///
/// `data` must be the remaining optional data following the
/// [optional header](pe::ImageOptionalHeader64). `number` must be from the
/// [`number_of_rva_and_sizes`](pe::ImageOptionalHeader64::number_of_rva_and_sizes)
/// field of the optional header.
pub fn parse(data: &'data [u8], number: u32) -> Result<Self> {
let entries = data
.read_slice_at(0, number as usize)
.read_error("Invalid PE number of RVA and sizes")?;
Ok(DataDirectories { entries })
}
/// The number of data directories.
#[allow(clippy::len_without_is_empty)]
pub fn len(&self) -> usize {
self.entries.len()
}
/// Iterator over the data directories.
pub fn iter(&self) -> slice::Iter<'data, pe::ImageDataDirectory> {
self.entries.iter()
}
/// Iterator which gives the directories as well as their index (one of the IMAGE_DIRECTORY_ENTRY_* constants).
pub fn enumerate(&self) -> core::iter::Enumerate<slice::Iter<'data, pe::ImageDataDirectory>> {
self.entries.iter().enumerate()
}
/// Returns the data directory at the given index.
///
/// Index should be one of the `IMAGE_DIRECTORY_ENTRY_*` constants.
///
/// Returns `None` if the index is larger than the table size,
/// or if the entry at the index has a zero virtual address.
pub fn get(&self, index: usize) -> Option<&'data pe::ImageDataDirectory> {
self.entries
.get(index)
.filter(|d| d.virtual_address.get(LE) != 0)
}
/// Returns the unparsed export directory.
///
/// `data` must be the entire file data.
pub fn export_directory<R: ReadRef<'data>>(
&self,
data: R,
sections: &SectionTable<'data>,
) -> Result<Option<&'data pe::ImageExportDirectory>> {
let data_dir = match self.get(pe::IMAGE_DIRECTORY_ENTRY_EXPORT) {
Some(data_dir) => data_dir,
None => return Ok(None),
};
let export_data = data_dir.data(data, sections)?;
ExportTable::parse_directory(export_data).map(Some)
}
/// Returns the partially parsed export directory.
///
/// `data` must be the entire file data.
pub fn export_table<R: ReadRef<'data>>(
&self,
data: R,
sections: &SectionTable<'data>,
) -> Result<Option<ExportTable<'data>>> {
let data_dir = match self.get(pe::IMAGE_DIRECTORY_ENTRY_EXPORT) {
Some(data_dir) => data_dir,
None => return Ok(None),
};
let export_va = data_dir.virtual_address.get(LE);
let export_data = data_dir.data(data, sections)?;
ExportTable::parse(export_data, export_va).map(Some)
}
/// Returns the partially parsed import directory.
///
/// `data` must be the entire file data.
pub fn import_table<R: ReadRef<'data>>(
&self,
data: R,
sections: &SectionTable<'data>,
) -> Result<Option<ImportTable<'data>>> {
let data_dir = match self.get(pe::IMAGE_DIRECTORY_ENTRY_IMPORT) {
Some(data_dir) => data_dir,
None => return Ok(None),
};
let import_va = data_dir.virtual_address.get(LE);
let (section_data, section_va) = sections
.pe_data_containing(data, import_va)
.read_error("Invalid import data dir virtual address")?;
Ok(Some(ImportTable::new(section_data, section_va, import_va)))
}
/// Returns the partially parsed delay-load import directory.
///
/// `data` must be the entire file data.
pub fn delay_load_import_table<R: ReadRef<'data>>(
&self,
data: R,
sections: &SectionTable<'data>,
) -> Result<Option<DelayLoadImportTable<'data>>> {
let data_dir = match self.get(pe::IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT) {
Some(data_dir) => data_dir,
None => return Ok(None),
};
let import_va = data_dir.virtual_address.get(LE);
let (section_data, section_va) = sections
.pe_data_containing(data, import_va)
.read_error("Invalid import data dir virtual address")?;
Ok(Some(DelayLoadImportTable::new(
section_data,
section_va,
import_va,
)))
}
/// Returns the blocks in the base relocation directory.
///
/// `data` must be the entire file data.
pub fn relocation_blocks<R: ReadRef<'data>>(
&self,
data: R,
sections: &SectionTable<'data>,
) -> Result<Option<RelocationBlockIterator<'data>>> {
let data_dir = match self.get(pe::IMAGE_DIRECTORY_ENTRY_BASERELOC) {
Some(data_dir) => data_dir,
None => return Ok(None),
};
let reloc_data = data_dir.data(data, sections)?;
Ok(Some(RelocationBlockIterator::new(reloc_data)))
}
/// Returns the resource directory.
///
/// `data` must be the entire file data.
pub fn resource_directory<R: ReadRef<'data>>(
&self,
data: R,
sections: &SectionTable<'data>,
) -> Result<Option<ResourceDirectory<'data>>> {
let data_dir = match self.get(pe::IMAGE_DIRECTORY_ENTRY_RESOURCE) {
Some(data_dir) => data_dir,
None => return Ok(None),
};
let rsrc_data = data_dir.data(data, sections)?;
Ok(Some(ResourceDirectory::new(rsrc_data)))
}
}
impl pe::ImageDataDirectory {
/// Return the virtual address range of this directory entry.
pub fn address_range(&self) -> (u32, u32) {
(self.virtual_address.get(LE), self.size.get(LE))
}
/// Return the file offset and size of this directory entry.
///
/// This function has some limitations:
/// - It requires that the data is contained in a single section.
/// - It uses the size field of the directory entry, which is
/// not desirable for all data directories.
/// - It uses the `virtual_address` of the directory entry as an address,
/// which is not valid for `IMAGE_DIRECTORY_ENTRY_SECURITY`.
pub fn file_range(&self, sections: &SectionTable<'_>) -> Result<(u32, u32)> {
let (offset, section_size) = sections
.pe_file_range_at(self.virtual_address.get(LE))
.read_error("Invalid data dir virtual address")?;
let size = self.size.get(LE);
if size > section_size {
return Err(Error("Invalid data dir size"));
}
Ok((offset, size))
}
/// Get the data referenced by this directory entry.
///
/// This function has some limitations:
/// - It requires that the data is contained in a single section.
/// - It uses the size field of the directory entry, which is
/// not desirable for all data directories.
/// - It uses the `virtual_address` of the directory entry as an address,
/// which is not valid for `IMAGE_DIRECTORY_ENTRY_SECURITY`.
pub fn data<'data, R: ReadRef<'data>>(
&self,
data: R,
sections: &SectionTable<'data>,
) -> Result<&'data [u8]> {
sections
.pe_data_at(data, self.virtual_address.get(LE))
.read_error("Invalid data dir virtual address")?
.get(..self.size.get(LE) as usize)
.read_error("Invalid data dir size")
}
}