object/read/pe/
section.rs

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1use core::marker::PhantomData;
2use core::{cmp, iter, slice, str};
3
4use crate::endian::LittleEndian as LE;
5use crate::pe;
6use crate::pe::ImageSectionHeader;
7use crate::read::{
8    self, CompressedData, CompressedFileRange, ObjectSection, ObjectSegment, ReadError, ReadRef,
9    Relocation, RelocationMap, Result, SectionFlags, SectionIndex, SectionKind, SegmentFlags,
10};
11
12use super::{ImageNtHeaders, PeFile, SectionTable};
13
14/// An iterator for the loadable sections in a [`PeFile32`](super::PeFile32).
15pub type PeSegmentIterator32<'data, 'file, R = &'data [u8]> =
16    PeSegmentIterator<'data, 'file, pe::ImageNtHeaders32, R>;
17/// An iterator for the loadable sections in a [`PeFile64`](super::PeFile64).
18pub type PeSegmentIterator64<'data, 'file, R = &'data [u8]> =
19    PeSegmentIterator<'data, 'file, pe::ImageNtHeaders64, R>;
20
21/// An iterator for the loadable sections in a [`PeFile`].
22#[derive(Debug)]
23pub struct PeSegmentIterator<'data, 'file, Pe, R = &'data [u8]>
24where
25    Pe: ImageNtHeaders,
26    R: ReadRef<'data>,
27{
28    pub(super) file: &'file PeFile<'data, Pe, R>,
29    pub(super) iter: slice::Iter<'data, pe::ImageSectionHeader>,
30}
31
32impl<'data, 'file, Pe, R> Iterator for PeSegmentIterator<'data, 'file, Pe, R>
33where
34    Pe: ImageNtHeaders,
35    R: ReadRef<'data>,
36{
37    type Item = PeSegment<'data, 'file, Pe, R>;
38
39    fn next(&mut self) -> Option<Self::Item> {
40        self.iter.next().map(|section| PeSegment {
41            file: self.file,
42            section,
43        })
44    }
45}
46
47/// A loadable section in a [`PeFile32`](super::PeFile32).
48pub type PeSegment32<'data, 'file, R = &'data [u8]> =
49    PeSegment<'data, 'file, pe::ImageNtHeaders32, R>;
50/// A loadable section in a [`PeFile64`](super::PeFile64).
51pub type PeSegment64<'data, 'file, R = &'data [u8]> =
52    PeSegment<'data, 'file, pe::ImageNtHeaders64, R>;
53
54/// A loadable section in a [`PeFile`].
55///
56/// Most functionality is provided by the [`ObjectSegment`] trait implementation.
57#[derive(Debug)]
58pub struct PeSegment<'data, 'file, Pe, R = &'data [u8]>
59where
60    Pe: ImageNtHeaders,
61    R: ReadRef<'data>,
62{
63    file: &'file PeFile<'data, Pe, R>,
64    section: &'data pe::ImageSectionHeader,
65}
66
67impl<'data, 'file, Pe, R> PeSegment<'data, 'file, Pe, R>
68where
69    Pe: ImageNtHeaders,
70    R: ReadRef<'data>,
71{
72    /// Get the PE file containing this segment.
73    pub fn pe_file(&self) -> &'file PeFile<'data, Pe, R> {
74        self.file
75    }
76
77    /// Get the raw PE section header.
78    pub fn pe_section(&self) -> &'data pe::ImageSectionHeader {
79        self.section
80    }
81}
82
83impl<'data, 'file, Pe, R> read::private::Sealed for PeSegment<'data, 'file, Pe, R>
84where
85    Pe: ImageNtHeaders,
86    R: ReadRef<'data>,
87{
88}
89
90impl<'data, 'file, Pe, R> ObjectSegment<'data> for PeSegment<'data, 'file, Pe, R>
91where
92    Pe: ImageNtHeaders,
93    R: ReadRef<'data>,
94{
95    #[inline]
96    fn address(&self) -> u64 {
97        u64::from(self.section.virtual_address.get(LE)).wrapping_add(self.file.common.image_base)
98    }
99
100    #[inline]
101    fn size(&self) -> u64 {
102        u64::from(self.section.virtual_size.get(LE))
103    }
104
105    #[inline]
106    fn align(&self) -> u64 {
107        self.file.section_alignment()
108    }
109
110    #[inline]
111    fn file_range(&self) -> (u64, u64) {
112        let (offset, size) = self.section.pe_file_range();
113        (u64::from(offset), u64::from(size))
114    }
115
116    fn data(&self) -> Result<&'data [u8]> {
117        self.section.pe_data(self.file.data)
118    }
119
120    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> {
121        Ok(read::util::data_range(
122            self.data()?,
123            self.address(),
124            address,
125            size,
126        ))
127    }
128
129    #[inline]
130    fn name_bytes(&self) -> Result<Option<&[u8]>> {
131        self.section
132            .name(self.file.common.symbols.strings())
133            .map(Some)
134    }
135
136    #[inline]
137    fn name(&self) -> Result<Option<&str>> {
138        let name = self.section.name(self.file.common.symbols.strings())?;
139        Ok(Some(
140            str::from_utf8(name)
141                .ok()
142                .read_error("Non UTF-8 PE section name")?,
143        ))
144    }
145
146    #[inline]
147    fn flags(&self) -> SegmentFlags {
148        let characteristics = self.section.characteristics.get(LE);
149        SegmentFlags::Coff { characteristics }
150    }
151}
152
153/// An iterator for the sections in a [`PeFile32`](super::PeFile32).
154pub type PeSectionIterator32<'data, 'file, R = &'data [u8]> =
155    PeSectionIterator<'data, 'file, pe::ImageNtHeaders32, R>;
156/// An iterator for the sections in a [`PeFile64`](super::PeFile64).
157pub type PeSectionIterator64<'data, 'file, R = &'data [u8]> =
158    PeSectionIterator<'data, 'file, pe::ImageNtHeaders64, R>;
159
160/// An iterator for the sections in a [`PeFile`].
161#[derive(Debug)]
162pub struct PeSectionIterator<'data, 'file, Pe, R = &'data [u8]>
163where
164    Pe: ImageNtHeaders,
165    R: ReadRef<'data>,
166{
167    pub(super) file: &'file PeFile<'data, Pe, R>,
168    pub(super) iter: iter::Enumerate<slice::Iter<'data, pe::ImageSectionHeader>>,
169}
170
171impl<'data, 'file, Pe, R> Iterator for PeSectionIterator<'data, 'file, Pe, R>
172where
173    Pe: ImageNtHeaders,
174    R: ReadRef<'data>,
175{
176    type Item = PeSection<'data, 'file, Pe, R>;
177
178    fn next(&mut self) -> Option<Self::Item> {
179        self.iter.next().map(|(index, section)| PeSection {
180            file: self.file,
181            index: SectionIndex(index + 1),
182            section,
183        })
184    }
185}
186
187/// A section in a [`PeFile32`](super::PeFile32).
188pub type PeSection32<'data, 'file, R = &'data [u8]> =
189    PeSection<'data, 'file, pe::ImageNtHeaders32, R>;
190/// A section in a [`PeFile64`](super::PeFile64).
191pub type PeSection64<'data, 'file, R = &'data [u8]> =
192    PeSection<'data, 'file, pe::ImageNtHeaders64, R>;
193
194/// A section in a [`PeFile`].
195///
196/// Most functionality is provided by the [`ObjectSection`] trait implementation.
197#[derive(Debug)]
198pub struct PeSection<'data, 'file, Pe, R = &'data [u8]>
199where
200    Pe: ImageNtHeaders,
201    R: ReadRef<'data>,
202{
203    pub(super) file: &'file PeFile<'data, Pe, R>,
204    pub(super) index: SectionIndex,
205    pub(super) section: &'data pe::ImageSectionHeader,
206}
207
208impl<'data, 'file, Pe, R> PeSection<'data, 'file, Pe, R>
209where
210    Pe: ImageNtHeaders,
211    R: ReadRef<'data>,
212{
213    /// Get the PE file containing this segment.
214    pub fn pe_file(&self) -> &'file PeFile<'data, Pe, R> {
215        self.file
216    }
217
218    /// Get the raw PE section header.
219    pub fn pe_section(&self) -> &'data pe::ImageSectionHeader {
220        self.section
221    }
222}
223
224impl<'data, 'file, Pe, R> read::private::Sealed for PeSection<'data, 'file, Pe, R>
225where
226    Pe: ImageNtHeaders,
227    R: ReadRef<'data>,
228{
229}
230
231impl<'data, 'file, Pe, R> ObjectSection<'data> for PeSection<'data, 'file, Pe, R>
232where
233    Pe: ImageNtHeaders,
234    R: ReadRef<'data>,
235{
236    type RelocationIterator = PeRelocationIterator<'data, 'file, R>;
237
238    #[inline]
239    fn index(&self) -> SectionIndex {
240        self.index
241    }
242
243    #[inline]
244    fn address(&self) -> u64 {
245        u64::from(self.section.virtual_address.get(LE)).wrapping_add(self.file.common.image_base)
246    }
247
248    #[inline]
249    fn size(&self) -> u64 {
250        u64::from(self.section.virtual_size.get(LE))
251    }
252
253    #[inline]
254    fn align(&self) -> u64 {
255        self.file.section_alignment()
256    }
257
258    #[inline]
259    fn file_range(&self) -> Option<(u64, u64)> {
260        let (offset, size) = self.section.pe_file_range();
261        if size == 0 {
262            None
263        } else {
264            Some((u64::from(offset), u64::from(size)))
265        }
266    }
267
268    fn data(&self) -> Result<&'data [u8]> {
269        self.section.pe_data(self.file.data)
270    }
271
272    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> {
273        Ok(read::util::data_range(
274            self.data()?,
275            self.address(),
276            address,
277            size,
278        ))
279    }
280
281    #[inline]
282    fn compressed_file_range(&self) -> Result<CompressedFileRange> {
283        Ok(CompressedFileRange::none(self.file_range()))
284    }
285
286    #[inline]
287    fn compressed_data(&self) -> Result<CompressedData<'data>> {
288        self.data().map(CompressedData::none)
289    }
290
291    #[inline]
292    fn name_bytes(&self) -> Result<&'data [u8]> {
293        self.section.name(self.file.common.symbols.strings())
294    }
295
296    #[inline]
297    fn name(&self) -> Result<&'data str> {
298        let name = self.name_bytes()?;
299        str::from_utf8(name)
300            .ok()
301            .read_error("Non UTF-8 PE section name")
302    }
303
304    #[inline]
305    fn segment_name_bytes(&self) -> Result<Option<&[u8]>> {
306        Ok(None)
307    }
308
309    #[inline]
310    fn segment_name(&self) -> Result<Option<&str>> {
311        Ok(None)
312    }
313
314    #[inline]
315    fn kind(&self) -> SectionKind {
316        self.section.kind()
317    }
318
319    fn relocations(&self) -> PeRelocationIterator<'data, 'file, R> {
320        PeRelocationIterator(PhantomData)
321    }
322
323    fn relocation_map(&self) -> read::Result<RelocationMap> {
324        RelocationMap::new(self.file, self)
325    }
326
327    fn flags(&self) -> SectionFlags {
328        SectionFlags::Coff {
329            characteristics: self.section.characteristics.get(LE),
330        }
331    }
332}
333
334impl<'data> SectionTable<'data> {
335    /// Return the file offset of the given virtual address, and the size up
336    /// to the end of the section containing it.
337    ///
338    /// Returns `None` if no section contains the address.
339    pub fn pe_file_range_at(&self, va: u32) -> Option<(u32, u32)> {
340        self.iter().find_map(|section| section.pe_file_range_at(va))
341    }
342
343    /// Return the data starting at the given virtual address, up to the end of the
344    /// section containing it.
345    ///
346    /// Ignores sections with invalid data.
347    ///
348    /// Returns `None` if no section contains the address.
349    pub fn pe_data_at<R: ReadRef<'data>>(&self, data: R, va: u32) -> Option<&'data [u8]> {
350        self.iter().find_map(|section| section.pe_data_at(data, va))
351    }
352
353    /// Return the data of the section that contains the given virtual address in a PE file.
354    ///
355    /// Also returns the virtual address of that section.
356    ///
357    /// Ignores sections with invalid data.
358    pub fn pe_data_containing<R: ReadRef<'data>>(
359        &self,
360        data: R,
361        va: u32,
362    ) -> Option<(&'data [u8], u32)> {
363        self.iter()
364            .find_map(|section| section.pe_data_containing(data, va))
365    }
366
367    /// Return the section that contains a given virtual address.
368    pub fn section_containing(&self, va: u32) -> Option<&'data ImageSectionHeader> {
369        self.iter().find(|section| section.contains_rva(va))
370    }
371}
372
373impl pe::ImageSectionHeader {
374    /// Return the offset and size of the section in a PE file.
375    ///
376    /// The size of the range will be the minimum of the file size and virtual size.
377    pub fn pe_file_range(&self) -> (u32, u32) {
378        // Pointer and size will be zero for uninitialized data; we don't need to validate this.
379        let offset = self.pointer_to_raw_data.get(LE);
380        let size = cmp::min(self.virtual_size.get(LE), self.size_of_raw_data.get(LE));
381        (offset, size)
382    }
383
384    /// Return the file offset of the given virtual address, and the remaining size up
385    /// to the end of the section.
386    ///
387    /// Returns `None` if the section does not contain the address.
388    pub fn pe_file_range_at(&self, va: u32) -> Option<(u32, u32)> {
389        let section_va = self.virtual_address.get(LE);
390        let offset = va.checked_sub(section_va)?;
391        let (section_offset, section_size) = self.pe_file_range();
392        // Address must be within section (and not at its end).
393        if offset < section_size {
394            Some((section_offset.checked_add(offset)?, section_size - offset))
395        } else {
396            None
397        }
398    }
399
400    /// Return the virtual address and size of the section.
401    pub fn pe_address_range(&self) -> (u32, u32) {
402        (self.virtual_address.get(LE), self.virtual_size.get(LE))
403    }
404
405    /// Return the section data in a PE file.
406    ///
407    /// The length of the data will be the minimum of the file size and virtual size.
408    pub fn pe_data<'data, R: ReadRef<'data>>(&self, data: R) -> Result<&'data [u8]> {
409        let (offset, size) = self.pe_file_range();
410        data.read_bytes_at(offset.into(), size.into())
411            .read_error("Invalid PE section offset or size")
412    }
413
414    /// Return the data starting at the given virtual address, up to the end of the
415    /// section.
416    ///
417    /// Ignores sections with invalid data.
418    ///
419    /// Returns `None` if the section does not contain the address.
420    pub fn pe_data_at<'data, R: ReadRef<'data>>(&self, data: R, va: u32) -> Option<&'data [u8]> {
421        let (offset, size) = self.pe_file_range_at(va)?;
422        data.read_bytes_at(offset.into(), size.into()).ok()
423    }
424
425    /// Tests whether a given RVA is part of this section
426    pub fn contains_rva(&self, va: u32) -> bool {
427        let section_va = self.virtual_address.get(LE);
428        match va.checked_sub(section_va) {
429            None => false,
430            Some(offset) => {
431                // Address must be within section (and not at its end).
432                offset < self.virtual_size.get(LE)
433            }
434        }
435    }
436
437    /// Return the section data if it contains the given virtual address.
438    ///
439    /// Also returns the virtual address of that section.
440    ///
441    /// Ignores sections with invalid data.
442    pub fn pe_data_containing<'data, R: ReadRef<'data>>(
443        &self,
444        data: R,
445        va: u32,
446    ) -> Option<(&'data [u8], u32)> {
447        let section_va = self.virtual_address.get(LE);
448        let offset = va.checked_sub(section_va)?;
449        let (section_offset, section_size) = self.pe_file_range();
450        // Address must be within section (and not at its end).
451        if offset < section_size {
452            let section_data = data
453                .read_bytes_at(section_offset.into(), section_size.into())
454                .ok()?;
455            Some((section_data, section_va))
456        } else {
457            None
458        }
459    }
460}
461
462/// An iterator for the relocations in an [`PeSection`].
463///
464/// This is a stub that doesn't implement any functionality.
465#[derive(Debug)]
466pub struct PeRelocationIterator<'data, 'file, R = &'data [u8]>(
467    PhantomData<(&'data (), &'file (), R)>,
468);
469
470impl<'data, 'file, R> Iterator for PeRelocationIterator<'data, 'file, R> {
471    type Item = (u64, Relocation);
472
473    fn next(&mut self) -> Option<Self::Item> {
474        None
475    }
476}
object/read/pe/section.rs

object/read/pe/
section.rs
