mirror of
https://github.com/serge1/ELFIO.git
synced 2024-11-19 02:13:45 +00:00
311 lines
11 KiB
C++
311 lines
11 KiB
C++
/*
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Copyright (C) 2001-present 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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#ifndef ELFIO_UTILS_HPP
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#define ELFIO_UTILS_HPP
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#include <cstdint>
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#include <ostream>
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#include <cstring>
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#define ELFIO_GET_ACCESS_DECL( TYPE, NAME ) virtual TYPE get_##NAME() const = 0
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#define ELFIO_SET_ACCESS_DECL( TYPE, NAME ) \
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virtual void set_##NAME( const TYPE& value ) = 0
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#define ELFIO_GET_SET_ACCESS_DECL( TYPE, NAME ) \
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virtual TYPE get_##NAME() const = 0; \
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virtual void set_##NAME( const TYPE& value ) = 0
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#define ELFIO_GET_ACCESS( TYPE, NAME, FIELD ) \
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TYPE get_##NAME() const override { return ( *convertor )( FIELD ); }
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#define ELFIO_SET_ACCESS( TYPE, NAME, FIELD ) \
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void set_##NAME( const TYPE& value ) override \
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{ \
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FIELD = decltype( FIELD )( value ); \
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FIELD = ( *convertor )( FIELD ); \
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}
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#define ELFIO_GET_SET_ACCESS( TYPE, NAME, FIELD ) \
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TYPE get_##NAME() const override { return ( *convertor )( FIELD ); } \
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void set_##NAME( const TYPE& value ) override \
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{ \
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FIELD = decltype( FIELD )( value ); \
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FIELD = ( *convertor )( FIELD ); \
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}
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namespace ELFIO {
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//------------------------------------------------------------------------------
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class endianness_convertor
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{
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public:
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//------------------------------------------------------------------------------
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void setup( unsigned char elf_file_encoding )
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{
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need_conversion = ( elf_file_encoding != get_host_encoding() );
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}
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//------------------------------------------------------------------------------
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uint64_t operator()( uint64_t value ) const
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{
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if ( !need_conversion ) {
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return value;
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}
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value = ( ( value & 0x00000000000000FFuLL ) << 56 ) |
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( ( value & 0x000000000000FF00uLL ) << 40 ) |
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( ( value & 0x0000000000FF0000uLL ) << 24 ) |
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( ( value & 0x00000000FF000000uLL ) << 8 ) |
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( ( value & 0x000000FF00000000uLL ) >> 8 ) |
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( ( value & 0x0000FF0000000000uLL ) >> 24 ) |
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( ( value & 0x00FF000000000000uLL ) >> 40 ) |
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( ( value & 0xFF00000000000000uLL ) >> 56 );
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return value;
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}
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//------------------------------------------------------------------------------
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int64_t operator()( int64_t value ) const
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{
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if ( !need_conversion ) {
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return value;
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}
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return (int64_t)( *this )( (uint64_t)value );
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}
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//------------------------------------------------------------------------------
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uint32_t operator()( uint32_t value ) const
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{
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if ( !need_conversion ) {
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return value;
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}
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value =
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( ( value & 0x000000FF ) << 24 ) | ( ( value & 0x0000FF00 ) << 8 ) |
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( ( value & 0x00FF0000 ) >> 8 ) | ( ( value & 0xFF000000 ) >> 24 );
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return value;
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}
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//------------------------------------------------------------------------------
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int32_t operator()( int32_t value ) const
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{
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if ( !need_conversion ) {
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return value;
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}
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return (int32_t)( *this )( (uint32_t)value );
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}
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//------------------------------------------------------------------------------
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uint16_t operator()( uint16_t value ) const
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{
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if ( !need_conversion ) {
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return value;
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}
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value =
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(uint16_t)( ( value & 0x00FF ) << 8 ) | ( ( value & 0xFF00 ) >> 8 );
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return value;
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}
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//------------------------------------------------------------------------------
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int16_t operator()( int16_t value ) const
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{
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if ( !need_conversion ) {
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return value;
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}
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return (int16_t)( *this )( (uint16_t)value );
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}
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//------------------------------------------------------------------------------
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int8_t operator()( int8_t value ) const { return value; }
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//------------------------------------------------------------------------------
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uint8_t operator()( uint8_t value ) const { return value; }
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//------------------------------------------------------------------------------
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private:
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//------------------------------------------------------------------------------
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unsigned char get_host_encoding() const
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{
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static const int tmp = 1;
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if ( 1 == *reinterpret_cast<const char*>( &tmp ) ) {
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return ELFDATA2LSB;
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}
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else {
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return ELFDATA2MSB;
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}
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}
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//------------------------------------------------------------------------------
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bool need_conversion = false;
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};
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//------------------------------------------------------------------------------
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struct address_translation
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{
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address_translation( uint64_t start, uint64_t size, uint64_t mapped_to )
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: start( start ), size( size ), mapped_to( mapped_to ){};
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std::streampos start;
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std::streampos size;
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std::streampos mapped_to;
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};
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//------------------------------------------------------------------------------
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class address_translator
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{
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public:
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//------------------------------------------------------------------------------
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void set_address_translation( std::vector<address_translation>& addr_trans )
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{
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addr_translations = addr_trans;
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std::sort( addr_translations.begin(), addr_translations.end(),
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[]( const address_translation& a,
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const address_translation& b ) -> bool {
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return a.start < b.start;
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} );
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}
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//------------------------------------------------------------------------------
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std::streampos operator[]( std::streampos value ) const
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{
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if ( addr_translations.empty() ) {
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return value;
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}
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for ( auto& t : addr_translations ) {
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if ( ( t.start <= value ) && ( ( value - t.start ) < t.size ) ) {
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return value - t.start + t.mapped_to;
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}
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}
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return value;
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}
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bool empty() const { return addr_translations.empty(); }
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private:
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std::vector<address_translation> addr_translations;
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};
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//------------------------------------------------------------------------------
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inline uint32_t elf_hash( const unsigned char* name )
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{
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uint32_t h = 0;
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uint32_t g = 0;
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while ( *name != '\0' ) {
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h = ( h << 4 ) + *name++;
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g = h & 0xf0000000;
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if ( g != 0 )
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h ^= g >> 24;
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h &= ~g;
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}
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return h;
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}
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//------------------------------------------------------------------------------
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inline uint32_t elf_gnu_hash( const unsigned char* s )
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{
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uint32_t h = 0x1505;
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for ( unsigned char c = *s; c != '\0'; c = *++s )
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h = ( h << 5 ) + h + c;
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return h;
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}
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//------------------------------------------------------------------------------
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inline std::string to_hex_string( uint64_t value )
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{
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std::string str;
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while ( value ) {
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if ( auto digit = value & 0xF; digit < 0xA ) {
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str = char( '0' + digit ) + str;
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}
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else {
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str = char( 'A' + digit - 0xA ) + str;
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}
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value >>= 4;
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}
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return "0x" + str;
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}
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//------------------------------------------------------------------------------
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inline void adjust_stream_size( std::ostream& stream, std::streamsize offset )
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{
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stream.seekp( 0, std::ios_base::end );
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if ( stream.tellp() < offset ) {
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std::streamsize size = offset - stream.tellp();
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stream.write( std::string( size_t( size ), '\0' ).c_str(), size );
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}
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stream.seekp( offset );
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}
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//------------------------------------------------------------------------------
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inline static size_t strnlength( const char* s, size_t n )
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{
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auto found = (const char*)std::memchr( s, '\0', n );
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return found ? (size_t)( found - s ) : n;
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}
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/**
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* Consumers should write an implementation of this class and pass an instance of it to the ELFIO::elfio constructor.
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*/
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class compression_interface
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{
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public:
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virtual ~compression_interface() = default;
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/**
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* decompresses a compressed section
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*
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* @param data the buffer of compressed data
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* @param endianness_convertor pointer to an endianness_convertor instance, used to convert numbers to/from the target endianness.
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* @param compressed_size the size of the data buffer, in bytes
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* @param decompressed_size a reference to a variable where the decompressed buffer size will be stored.
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* @returns a smart pointer to the decompressed data.
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*/
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virtual std::unique_ptr<char[]>
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inflate( const char* data,
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const endianness_convertor* convertor,
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Elf_Xword compressed_size,
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Elf_Xword& uncompressed_size ) const = 0;
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/**
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* compresses a section
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*
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* @param data the buffer of uncompressed data
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* @param endianness_convertor pointer to an endianness_convertor instance, used to convert numbers to/from the target endianness.
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* @param decompressed_size the size of the data buffer, in bytes
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* @param compressed_size a reference to a variable where the compressed buffer size will be stored.
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* @returns a smart pointer to the compressed data.
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*/
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virtual std::unique_ptr<char[]>
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deflate( const char* data,
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const endianness_convertor* convertor,
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Elf_Xword decompressed_size,
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Elf_Xword& compressed_size ) const = 0;
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};
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} // namespace ELFIO
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#endif // ELFIO_UTILS_HPP
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