diff options
| author | JustSomePwner <crotchyalt@gmail.com> | 2018-08-30 14:01:54 +0200 |
|---|---|---|
| committer | JustSomePwner <crotchyalt@gmail.com> | 2018-08-30 14:01:54 +0200 |
| commit | 7ccb819f867493f8ec202ea3b39c94c198c64584 (patch) | |
| tree | 94622e61af0ff359e3d6689cf274d74f60b2492a /client/strings.hpp | |
| parent | 564d979b79e8a5aaa5014eba0ecd36c61575934f (diff) | |
first
Diffstat (limited to 'client/strings.hpp')
| -rw-r--r-- | client/strings.hpp | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/client/strings.hpp b/client/strings.hpp new file mode 100644 index 0000000..382ddb2 --- /dev/null +++ b/client/strings.hpp @@ -0,0 +1,163 @@ +//--------------------------------------------------------------------------------
+//-- XorCompileTime.hpp
+//
+// Author: frk
+// Date: 12.12.2015
+//
+//--------------------------------------------------------------------------------
+
+#pragma once
+#include <string>
+#include <array>
+#include <cstdarg>
+
+#define BEGIN_NAMESPACE( x ) namespace x {
+#define END_NAMESPACE }
+
+BEGIN_NAMESPACE( strenc )
+
+constexpr auto time = __TIME__;
+constexpr auto seed = static_cast< int >( time[ 7 ] ) + static_cast< int >( time[ 6 ] ) * 10 + static_cast< int >( time[ 4 ] ) * 60 + static_cast< int >( time[ 3 ] ) * 600 + static_cast< int >( time[ 1 ] ) * 3600 + static_cast< int >( time[ 0 ] ) * 36000;
+
+// 1988, Stephen Park and Keith Miller
+// "Random Number Generators: Good Ones Are Hard To Find", considered as "minimal standard"
+// Park-Miller 31 bit pseudo-random number generator, implemented with G. Carta's optimisation:
+// with 32-bit math and without division
+
+template < int N >
+struct RandomGenerator {
+private:
+ static constexpr unsigned a = 16807; // 7^5
+ static constexpr unsigned m = 2147483647; // 2^31 - 1
+
+ static constexpr unsigned s = RandomGenerator< N - 1 >::value;
+ static constexpr unsigned lo = a * ( s & 0xFFFF ); // Multiply lower 16 bits by 16807
+ static constexpr unsigned hi = a * ( s >> 16 ); // Multiply higher 16 bits by 16807
+ static constexpr unsigned lo2 = lo + ( ( hi & 0x7FFF ) << 16 ); // Combine lower 15 bits of hi with lo's upper bits
+ static constexpr unsigned hi2 = hi >> 15; // Discard lower 15 bits of hi
+ static constexpr unsigned lo3 = lo2 + hi;
+
+public:
+ static constexpr unsigned max = m;
+ static constexpr unsigned value = lo3 > m ? lo3 - m : lo3;
+};
+
+template <>
+struct RandomGenerator< 0 > {
+ static constexpr unsigned value = seed;
+};
+
+template < int N, int M >
+struct RandomInt {
+ static constexpr auto value = RandomGenerator< N + 1 >::value % M;
+};
+
+template < int N >
+struct RandomChar {
+ static const char value = static_cast< char >( 1 + RandomInt< N, 0x7F - 1 >::value );
+};
+
+template < size_t N, int K >
+struct XorString {
+private:
+ const char _key;
+ std::array< char, N + 1 > _encrypted;
+ bool decrypted = false;
+
+ constexpr char enc( char c ) const {
+ return c ^ _key;
+ }
+
+ char dec( char c ) const {
+ return c ^ _key;
+ }
+
+public:
+ template < size_t... Is >
+ constexpr __forceinline XorString( const char* const str, std::index_sequence< Is... > ) : _key( RandomChar< K >::value ), _encrypted{ enc( str[ Is ] )... } {
+ }
+
+ __forceinline const char* decrypt( void ) {
+ if( !decrypted ) {
+ for( size_t i = 0; i < N; ++i ) {
+ _encrypted[ i ] = dec( _encrypted[ i ] );
+ }
+ _encrypted[ N ] = '\0';
+ decrypted = true;
+ }
+
+ return _encrypted.data( );
+ }
+};
+
+//--------------------------------------------------------------------------------
+//-- Note: XorStr will __NOT__ work directly with functions like printf.
+// To work with them you need a wrapper function that takes a const char*
+// as parameter and passes it to printf and alike.
+//
+// The Microsoft Compiler/Linker is not working correctly with variadic
+// templates!
+//
+// Use the functions below or use std::cout (and similar)!
+//--------------------------------------------------------------------------------
+
+#if( 1 )
+static auto w_printf = [ ]( const char* fmt, ... ) {
+ va_list args;
+ va_start( args, fmt );
+ vprintf_s( fmt, args );
+ va_end( args );
+};
+
+static auto w_printf_s = [ ]( const char* fmt, ... ) {
+ va_list args;
+ va_start( args, fmt );
+ vprintf_s( fmt, args );
+ va_end( args );
+};
+
+static auto w_sprintf = [ ]( char* buf, const char* fmt, ... ) {
+ va_list args;
+ va_start( args, fmt );
+ vsprintf( buf, fmt, args );
+ va_end( args );
+};
+
+static auto w_sprintf_s = [ ]( char* buf, size_t buf_size, const char* fmt, ... ) {
+ va_list args;
+ va_start( args, fmt );
+ vsprintf_s( buf, buf_size, fmt, args );
+ va_end( args );
+};
+#endif
+
+//for compatibility with debug mode
+struct debug_ret {
+private:
+ const char* ret;
+
+public:
+ debug_ret( const char* str ) : ret( str ) { };
+
+ auto decrypt( ) {
+ return ret;
+ }
+};
+
+constexpr size_t strlen_ct( const char* const str ) {
+ size_t out = 1;
+
+ for( ; str[ out ] != '\0'; ++out );
+
+ return out;
+}
+
+#if 0
+#define xors_raw( s ) ( strenc::XorString< strenc::strlen_ct( s ), __COUNTER__ >( s, std::make_index_sequence< sizeof( s ) - 1>() ) )
+#define xors( s ) ( strenc::XorString< strenc::strlen_ct( s ), __COUNTER__ >( s, std::make_index_sequence< sizeof( s ) - 1>() ).decrypt() )
+#else
+#define xors_raw( s ) ( [ ]{ strenc::debug_ret ret{ s }; return ret; }( ) )
+#define xors( s ) ( s )
+#endif
+
+END_NAMESPACE
\ No newline at end of file |