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use core::convert::TryInto;
use core::fmt::Debug;
use crate::elf;
use crate::endian;
use crate::pod::Pod;
use crate::read::{ReadError, Result, StringTable};
/// A trait for generic access to [`elf::Dyn32`] and [`elf::Dyn64`].
#[allow(missing_docs)]
pub trait Dyn: Debug + Pod {
type Word: Into<u64>;
type Endian: endian::Endian;
fn d_tag(&self, endian: Self::Endian) -> Self::Word;
fn d_val(&self, endian: Self::Endian) -> Self::Word;
/// Try to convert the tag to a `u32`.
fn tag32(&self, endian: Self::Endian) -> Option<u32> {
self.d_tag(endian).into().try_into().ok()
}
/// Try to convert the value to a `u32`.
fn val32(&self, endian: Self::Endian) -> Option<u32> {
self.d_val(endian).into().try_into().ok()
}
/// Return true if the value is an offset in the dynamic string table.
fn is_string(&self, endian: Self::Endian) -> bool {
if let Some(tag) = self.tag32(endian) {
match tag {
elf::DT_NEEDED
| elf::DT_SONAME
| elf::DT_RPATH
| elf::DT_RUNPATH
| elf::DT_AUXILIARY
| elf::DT_FILTER => true,
_ => false,
}
} else {
false
}
}
/// Use the value to get a string in a string table.
///
/// Does not check for an appropriate tag.
fn string<'data>(
&self,
endian: Self::Endian,
strings: StringTable<'data>,
) -> Result<&'data [u8]> {
self.val32(endian)
.and_then(|val| strings.get(val).ok())
.read_error("Invalid ELF dyn string")
}
/// Return true if the value is an address.
fn is_address(&self, endian: Self::Endian) -> bool {
if let Some(tag) = self.tag32(endian) {
match tag {
elf::DT_PLTGOT
| elf::DT_HASH
| elf::DT_STRTAB
| elf::DT_SYMTAB
| elf::DT_RELA
| elf::DT_INIT
| elf::DT_FINI
| elf::DT_SYMBOLIC
| elf::DT_REL
| elf::DT_DEBUG
| elf::DT_JMPREL
| elf::DT_FINI_ARRAY
| elf::DT_INIT_ARRAY
| elf::DT_PREINIT_ARRAY
| elf::DT_SYMTAB_SHNDX
| elf::DT_VERDEF
| elf::DT_VERNEED
| elf::DT_VERSYM
| elf::DT_ADDRRNGLO..=elf::DT_ADDRRNGHI => true,
_ => false,
}
} else {
false
}
}
}
impl<Endian: endian::Endian> Dyn for elf::Dyn32<Endian> {
type Word = u32;
type Endian = Endian;
#[inline]
fn d_tag(&self, endian: Self::Endian) -> Self::Word {
self.d_tag.get(endian)
}
#[inline]
fn d_val(&self, endian: Self::Endian) -> Self::Word {
self.d_val.get(endian)
}
}
impl<Endian: endian::Endian> Dyn for elf::Dyn64<Endian> {
type Word = u64;
type Endian = Endian;
#[inline]
fn d_tag(&self, endian: Self::Endian) -> Self::Word {
self.d_tag.get(endian)
}
#[inline]
fn d_val(&self, endian: Self::Endian) -> Self::Word {
self.d_val.get(endian)
}
}