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read/pe: add DataDirectories and ImportTable
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| use core::slice; | ||
|
|
||
| use crate::read::{ReadError, ReadRef, Result}; | ||
| use crate::{pe, LittleEndian as LE}; | ||
|
|
||
| use super::{ExportTable, ImportTable, SectionTable}; | ||
|
|
||
| /// The table of data directories in a PE file. | ||
| #[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 }) | ||
| } | ||
|
|
||
| /// Iterator over the data directories. | ||
| pub fn iter(&self) -> slice::Iter<'data, pe::ImageDataDirectory> { | ||
| self.entries.iter() | ||
| } | ||
|
|
||
| /// 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 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))) | ||
| } | ||
| } | ||
|
|
||
| impl pe::ImageDataDirectory { | ||
| /// 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") | ||
| } | ||
| } |
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