259 lines
8.6 KiB
C++
259 lines
8.6 KiB
C++
/*
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Copyright (C) 2014-2014 by Serge Lamikhov-Center
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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/*! @file coffi_symbols.hpp
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* @brief COFFI library classes for the COFF symbols and symbol table.
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*
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* Do not include this file directly. This file is included by coffi.hpp.
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*/
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#ifndef COFFI_SYMBOLS_HPP
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#define COFFI_SYMBOLS_HPP
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#include <vector>
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#include <coffi/coffi_utils.hpp>
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#include <coffi/coffi_headers.hpp>
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namespace COFFI {
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//-------------------------------------------------------------------------
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//! Class for accessing a COFF symbol.
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class symbol
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{
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public:
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//---------------------------------------------------------------------
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symbol(string_to_name_provider* stn) : stn_{stn}
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{
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std::fill_n(reinterpret_cast<char*>(&header), sizeof(header), '\0');
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}
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//---------------------------------------------------------------------
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//! @accessors{symbol}
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COFFI_GET_SET_ACCESS(uint32_t, value);
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COFFI_GET_SET_ACCESS(uint16_t, section_number);
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COFFI_GET_SET_ACCESS(uint16_t, type);
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COFFI_GET_SET_ACCESS(uint8_t, storage_class);
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COFFI_GET_SET_ACCESS(uint8_t, aux_symbols_number);
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//! @endaccessors
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//---------------------------------------------------------------------
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uint32_t get_index() const { return index_; }
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//---------------------------------------------------------------------
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void set_index(uint32_t index) { index_ = index; }
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//------------------------------------------------------------------------------
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const std::string get_name() const
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{
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return stn_->string_to_name(header.name);
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}
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//---------------------------------------------------------------------
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void set_name(const std::string& value)
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{
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stn_->name_to_string(value, header.name);
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}
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//---------------------------------------------------------------------
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const std::vector<auxiliary_symbol_record>& get_auxiliary_symbols() const
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{
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return auxs;
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}
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//---------------------------------------------------------------------
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std::vector<auxiliary_symbol_record>& get_auxiliary_symbols()
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{
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return auxs;
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}
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//---------------------------------------------------------------------
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bool load(std::istream& stream)
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{
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stream.read(reinterpret_cast<char*>(&header), sizeof(header));
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if (stream.gcount() != sizeof(header)) {
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return false;
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}
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for (uint8_t i = 0; i < get_aux_symbols_number(); ++i) {
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auxiliary_symbol_record a;
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stream.read(reinterpret_cast<char*>(&a), sizeof(symbol_record));
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if (stream.gcount() != sizeof(symbol_record)) {
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return false;
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}
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auxs.push_back(a);
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}
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return true;
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}
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//---------------------------------------------------------------------
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void save(std::ostream& stream)
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{
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set_aux_symbols_number(auxs.size());
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stream.write(reinterpret_cast<char*>(&header), sizeof(header));
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for (auto aux : auxs) {
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stream.write(reinterpret_cast<char*>(&aux), sizeof(symbol_record));
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}
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}
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//---------------------------------------------------------------------
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protected:
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symbol_record header;
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std::vector<auxiliary_symbol_record> auxs;
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uint32_t index_;
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string_to_name_provider* stn_;
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};
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//-------------------------------------------------------------------------
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//! Class for accessing the symbol table.
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class coffi_symbols : public virtual symbol_provider,
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public virtual string_to_name_provider
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{
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public:
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//---------------------------------------------------------------------
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coffi_symbols() {}
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//---------------------------------------------------------------------
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~coffi_symbols() { clean_symbols(); }
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//---------------------------------------------------------------------
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//! @copydoc symbol_provider::get_symbol(uint32_t)
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virtual symbol* get_symbol(uint32_t index)
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{
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return (symbol*)((const coffi_symbols*)this)->get_symbol(index);
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}
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//---------------------------------------------------------------------
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//! @copydoc symbol_provider::get_symbol(uint32_t)
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virtual const symbol* get_symbol(uint32_t index) const
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{
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uint32_t L = 0;
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uint32_t R = symbols_.size() - 1;
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while (L <= R) {
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uint32_t m = (L + R) / 2;
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if (symbols_[m].get_index() < index) {
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L = m + 1;
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}
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else if (symbols_[m].get_index() > index) {
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R = m - 1;
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}
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else {
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return &(symbols_[m]);
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}
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}
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return nullptr;
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}
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//---------------------------------------------------------------------
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//! @copydoc symbol_provider::get_symbol(const std::string &)
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virtual symbol* get_symbol(const std::string& name)
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{
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return (symbol*)((const coffi_symbols*)this)->get_symbol(name);
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}
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//---------------------------------------------------------------------
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//! @copydoc symbol_provider::get_symbol(const std::string &)
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virtual const symbol* get_symbol(const std::string& name) const
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{
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for (auto s = symbols_.begin(); s != symbols_.end(); s++) {
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if (s->get_name() == name) {
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return &(*s);
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}
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}
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return nullptr;
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}
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//---------------------------------------------------------------------
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std::vector<symbol>* get_symbols() { return &symbols_; }
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//---------------------------------------------------------------------
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const std::vector<symbol>* get_symbols() const { return &symbols_; }
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//---------------------------------------------------------------------
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//! @copydoc symbol_provider::add_symbol()
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symbol* add_symbol(const std::string& name)
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{
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uint32_t index = 0;
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if (symbols_.size() > 0) {
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index = (symbols_.end() - 1)->get_index() + 1 +
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(symbols_.end() - 1)->get_auxiliary_symbols().size();
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}
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symbol s{this};
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s.set_index(index);
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s.set_name(name);
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symbols_.push_back(s);
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return &*(symbols_.end() - 1);
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}
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//---------------------------------------------------------------------
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protected:
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//---------------------------------------------------------------------
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void clean_symbols() { symbols_.clear(); }
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//---------------------------------------------------------------------
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bool load_symbols(std::istream& stream, const coff_header* header)
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{
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if (header->get_symbol_table_offset() == 0) {
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return true;
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}
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stream.seekg(header->get_symbol_table_offset());
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for (uint32_t i = 0; i < header->get_symbols_count(); ++i) {
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symbol s{this};
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if (!s.load(stream)) {
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return false;
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}
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s.set_index(i);
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i += s.get_auxiliary_symbols().size();
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symbols_.push_back(s);
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}
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return true;
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}
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//---------------------------------------------------------------------
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void save_symbols(std::ostream& stream)
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{
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for (auto s : symbols_) {
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s.save(stream);
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}
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}
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//---------------------------------------------------------------------
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uint32_t get_symbols_filesize()
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{
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uint32_t filesize = 0;
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for (auto s : symbols_) {
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filesize +=
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sizeof(symbol_record) * (1 + s.get_auxiliary_symbols().size());
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}
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return filesize;
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}
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//---------------------------------------------------------------------
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std::vector<symbol> symbols_;
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};
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} // namespace COFFI
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#endif //COFFI_SYMBOLS_HPP
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