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use std::{error::Error}; use crate::{KOFileReader, KOFileWriter}; pub struct HeaderTable { headers: Vec<SectionHeader> } impl HeaderTable { pub fn new(headers: Vec<SectionHeader>) -> HeaderTable { HeaderTable { headers } } pub fn get_headers(&self) -> &Vec<SectionHeader> { &self.headers } pub fn get_header(&self, index: usize) -> Result<&SectionHeader, Box<dyn Error>> { match self.headers.get(index) { Some(h) => Ok(h), None => Err(format!("Tried to index section {} in the section header, which does not exist", index).into()), } } pub fn add(&mut self, header: SectionHeader) { self.headers.push(header); } pub fn read(reader: &mut KOFileReader, number_sections: u16) -> Result<HeaderTable, Box<dyn Error>> { let mut headers: Vec<SectionHeader> = Vec::with_capacity(number_sections as usize); for _ in 0..number_sections { headers.push(SectionHeader::read(reader)?); } Ok(HeaderTable::new(headers)) } pub fn write(&self, writer: &mut KOFileWriter) -> Result<(), Box<dyn Error>> { for header in self.headers.iter() { header.write(writer)?; } Ok(()) } pub fn validate_conventions(&self) -> Result<(), Box<dyn Error>> { if self.headers.len() < 4 { return Err("At least the null section, symbol string table, symbol table, and data section are required. One or more are missing.".into()); } if self.get_header(0)?.get_type() != SectionType::NULL { return Err("The first entry into the section header table should be the null section.".into()); } if self.get_header(1)?.get_type() != SectionType::STRTAB || self.get_header(1)?.name() != ".symstrtab" { return Err("Expected the symbol string table at index 1".into()); } if self.get_header(2)?.get_type() != SectionType::DATA || self.get_header(2)?.name() != ".data" { return Err("Expected the symbol data section at index 2".into()); } if self.get_header(3)?.get_type() != SectionType::SYMTAB || self.get_header(3)?.name() != ".symtab" { return Err("Expected the symbol table at index 3".into()); } Ok(()) } } pub struct SectionHeader { section_type: SectionType, section_offset: u32, section_size: u32, section_name: String, } impl SectionHeader { pub fn new(section_type: SectionType, section_offset: u32, section_size: u32, section_name: &str) -> SectionHeader { SectionHeader { section_type, section_offset, section_size, section_name: section_name.to_owned(), } } pub fn read(reader: &mut KOFileReader) -> Result<SectionHeader, Box<dyn Error>> { let section_type = SectionType::from(reader.next()?)?; let section_offset = reader.read_uint32()?; let section_size = reader.read_uint32()?; let section_name = reader.read_string()?; Ok(SectionHeader::new(section_type, section_offset, section_size, §ion_name)) } pub fn write(&self, writer: &mut KOFileWriter) -> Result<(), Box<dyn Error>> { writer.write(self.section_type.to_byte())?; writer.write_uint32(self.section_offset)?; writer.write_uint32(self.section_size)?; writer.write_string(&self.section_name)?; Ok(()) } pub fn get_type(&self) -> SectionType { self.section_type } pub fn offset(&self) -> u32 { self.section_offset } pub fn set_offset(&mut self, offset: u32) { self.section_offset = offset; } pub fn size(&self) -> u32 { 9 + self.section_name.len() as u32 + 1 } pub fn section_size(&self) -> u32 { self.section_size } pub fn name(&self) -> &String { &self.section_name } } #[derive(Debug, Clone, Copy, PartialEq, Eq)] pub enum SectionType { NULL, SYMTAB, STRTAB, REL, DATA, DEBUG } impl SectionType { pub fn to_byte(&self) -> u8 { match self { SectionType::NULL => 0, SectionType::SYMTAB => 1, SectionType::STRTAB => 2, SectionType::REL => 3, SectionType::DATA => 4, SectionType::DEBUG => 5, } } pub fn from(byte: u8) -> Result<SectionType, Box<dyn Error>>{ match byte { 0 => Ok(SectionType::NULL), 1 => Ok(SectionType::SYMTAB), 2 => Ok(SectionType::STRTAB), 3 => Ok(SectionType::REL), 4 => Ok(SectionType::DATA), 5 => Ok(SectionType::DEBUG), b => Err(format!("Section type of {} is not a valid section type.", b).into()) } } }