251 lines
4.4 KiB
C++
251 lines
4.4 KiB
C++
/*
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* This file is a part of TTMath Bignum Library
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* and is distributed under the (new) BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2006-2010, Tomasz Sowa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name Tomasz Sowa nor the names of contributors to this
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* project may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef headerfilettmathmisc
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#define headerfilettmathmisc
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/*!
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\file ttmathmisc.h
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\brief some helpful functions
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*/
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#include <string>
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namespace ttmath
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{
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/*!
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some helpful functions
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*/
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class Misc
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{
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public:
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/*
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*
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* AssignString(result, str)
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* result = str
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*
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*/
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/*!
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result = str
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*/
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static void AssignString(std::string & result, const char * str)
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{
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result = str;
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}
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#ifndef TTMATH_DONT_USE_WCHAR
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/*!
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result = str
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*/
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static void AssignString(std::wstring & result, const char * str)
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{
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result.clear();
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for( ; *str ; ++str )
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result += *str;
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}
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/*!
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result = str
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*/
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static void AssignString(std::wstring & result, const std::string & str)
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{
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return AssignString(result, str.c_str());
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}
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/*!
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result = str
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*/
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static void AssignString(std::string & result, const wchar_t * str)
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{
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result.clear();
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for( ; *str ; ++str )
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result += static_cast<char>(*str);
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}
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/*!
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result = str
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*/
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static void AssignString(std::string & result, const std::wstring & str)
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{
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return AssignString(result, str.c_str());
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}
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#endif
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/*
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*
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* AddString(result, str)
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* result += str
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*
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*/
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/*!
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result += str
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*/
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static void AddString(std::string & result, const char * str)
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{
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result += str;
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}
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#ifndef TTMATH_DONT_USE_WCHAR
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/*!
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result += str
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*/
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static void AddString(std::wstring & result, const char * str)
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{
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for( ; *str ; ++str )
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result += *str;
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}
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#endif
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/*
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this method omits any white characters from the string
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char_type is char or wchar_t
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*/
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template<class char_type>
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static void SkipWhiteCharacters(const char_type * & c)
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{
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// 13 is at the end in a DOS text file (\r\n)
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while( (*c==' ' ) || (*c=='\t') || (*c==13 ) || (*c=='\n') )
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++c;
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}
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/*!
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this static method converts one character into its value
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for example:
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1 -> 1
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8 -> 8
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A -> 10
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f -> 15
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this method don't check whether c is correct or not
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*/
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static uint CharToDigit(uint c)
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{
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if(c>='0' && c<='9')
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return c-'0';
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if(c>='a' && c<='z')
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return c-'a'+10;
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return c-'A'+10;
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}
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/*!
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this method changes a character 'c' into its value
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(if there can't be a correct value it returns -1)
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for example:
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c=2, base=10 -> function returns 2
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c=A, base=10 -> function returns -1
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c=A, base=16 -> function returns 10
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*/
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static sint CharToDigit(uint c, uint base)
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{
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if( c>='0' && c<='9' )
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c=c-'0';
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else
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if( c>='a' && c<='z' )
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c=c-'a'+10;
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else
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if( c>='A' && c<='Z' )
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c=c-'A'+10;
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else
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return -1;
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if( c >= base )
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return -1;
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return sint(c);
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}
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/*!
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this method converts a digit into a char
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digit should be from <0,F>
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(we don't have to get a base)
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for example:
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1 -> 1
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8 -> 8
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10 -> A
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15 -> F
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*/
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static uint DigitToChar(uint digit)
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{
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if( digit < 10 )
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return digit + '0';
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return digit - 10 + 'A';
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}
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}; // struct Misc
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}
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#endif
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