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#pragma once
/* SPDX-License-Identifier: Unlicense
*/
#include "elf.h"
#include "data_buffer.h"
#include <cstdlib>
namespace ELF {
struct ProgramHeader32Table {
const ProgramHeader32 *headers{};
size_t size{};
static ProgramHeader32Table FromView(const DataView &, DataEncoding);
};
struct Segment {
Segment *next{};
const DataView view{};
};
class Image {
const DataBuffer _data;
char *const _error;
const Header32 _h;
const ProgramHeader32Table _pht;
const SectionHeader32 _shstrtab, _symtab, _strtab;
public:
explicit Image(DataBuffer&&);
~Image();
constexpr bool IsValid() const { return _error == nullptr; }
constexpr const DataBuffer &Data() const { return _data; };
constexpr const DataView ProgramView() const
{
if (!IsValid()) {
return DataView{};
}
for (size_t i = 0; i < _pht.size; i++) {
const auto ph = _pht.headers[i];
const bool is_code = (ph.flags & (kPHFlagX | kPHFlagW | kPHFlagR)) ==
(kPHFlagX | kPHFlagR);
const bool is_load = ParsePHType(ph.type) == PHType::kLoad;
const bool contains_entry = _h.entry >= ph.vaddr && _h.entry < ph.vaddr + ph.memsz;
if (is_load && is_code && ph.vaddr == 0 && contains_entry)
{
return _data.View(ph.offset, ph.filesz);
}
}
return DataView{};
};
constexpr const char *Error() const { return _error; }
ELF::SectionHeader32 GetSectionHeaderByName(const char *name) const;
constexpr const ELF::SectionHeader32 GetSectionHeader(uint32_t index) const
{
if (index > _h.shnum) {
return SectionHeader32{};
}
const size_t offset = _h.shoff + kSectionHeaderSize * index;
if (offset + kSectionHeaderSize > _data.buffer_size) {
return SectionHeader32{};
}
return SectionHeader32::FromBytes(
_data.buffer + offset, _h.ident.data_encoding);
}
uint32_t GetSectionHeaderIndexByName(const char *name) const;
constexpr ELF::Symbol32 GetSymbolByIndex(uint32_t index) const
{
if (!IsValid()) {
return Symbol32{};
}
if (_symtab.entsize == 0 || index >= _symtab.size / _symtab.entsize) {
return Symbol32{};
}
auto symbol = Symbol32::FromBytes(
_data.buffer + _symtab.offset + _symtab.entsize * index,
_h.ident.data_encoding);
if (symbol.namendx < _strtab.size && _data.buffer[_strtab.offset + _strtab.size] == '\0') {
symbol.name = reinterpret_cast<const char *>(
_data.buffer + _strtab.offset + symbol.namendx);
}
return symbol;
}
};
}
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