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/* Copyright (C) 2021-present by Serge Lamikhov-Center Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ use super::*; /// A section data accessor intended to string tables /// /// For example: /// ``` /// use std::fs::File; /// use std::io; /// use std::io::{BufReader, Error}; /// use elfio::{Elfio, StringSectionAccessor}; // Uncomment in the real code /// /// fn main() -> io::Result<()> { /// let elf_file = File::open("tests/files/hello_64")?; /// let mut file_reader = BufReader::new(elf_file); /// /// let mut elf = elfio::Elfio::new(); /// /// elf.load(&mut file_reader)?; /// /// let section = elf.get_section_by_name(".strtab"); /// /// match section { /// Some(s) => { /// let strtab = StringSectionAccessor::new(&elf, s); /// println!("{}", strtab.get_string(1)); /// } /// None => return Err(Error::new(io::ErrorKind::Other, "section not found")), /// } /// /// Ok(()) /// } /// ``` // -------------------------------------------------------------------------- pub struct StringSectionAccessor<'a> { _elfio: &'a Elfio, section: &'a dyn ElfSectionTrait, } // -------------------------------------------------------------------------- impl<'a> StringSectionAccessor<'a> { // -------------------------------------------------------------------------- /// Creates a new instance of the string table accessor pub fn new(elfio: &'a Elfio, section: &'a dyn ElfSectionTrait) -> StringSectionAccessor<'a> { StringSectionAccessor { _elfio: elfio, section, } } // -------------------------------------------------------------------------- /// Find and return null terminated byte sequence as a string slice fn str_from_u8_nul_utf8_unchecked(utf8_src: &[u8]) -> &str { let nul_range_end = utf8_src .iter() .position(|&c| c == b'\0') .unwrap_or(utf8_src.len()); // default to length if no `\0` present unsafe { ::std::str::from_utf8_unchecked(&utf8_src[0..nul_range_end]) } } // -------------------------------------------------------------------------- /// Returns a string from string table by its index pub fn get_string(&self, index: ElfWord) -> String { let strdata = self.section.get_data(); Self::str_from_u8_nul_utf8_unchecked(&strdata[index as usize..]).to_string() } }