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git-svn-id: http://encfs.googlecode.com/svn/trunk@121 db9cf616-1c43-0410-9cb8-a902689de0d6
108 lines
2.6 KiB
C++
108 lines
2.6 KiB
C++
/*****************************************************************************
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* Author: Valient Gough <vgough@pobox.com>
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*
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*****************************************************************************
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* Copyright (c) 2004, Valient Gough
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _Range_incl_
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#define _Range_incl_
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#include <ostream>
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namespace encfs {
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class Range {
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int minVal;
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int maxVal;
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int increment;
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public:
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Range();
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Range(int minMax);
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Range(int min, int max, int increment);
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bool allowed(int value) const;
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int closest(int value) const;
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int min() const;
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int max() const;
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int inc() const;
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};
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inline std::ostream &operator<<(std::ostream &st, const Range &r) {
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bool separator = false;
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for (int size = r.min(); size <= r.max(); size += r.inc()) {
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if (separator)
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st << ", ";
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else
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separator = true;
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st << size;
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}
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return st;
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}
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inline Range::Range(int minMax) {
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this->minVal = minMax;
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this->maxVal = minMax;
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this->increment = 1;
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}
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inline Range::Range(int min_, int max_, int increment_) {
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this->minVal = min_;
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this->maxVal = max_;
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this->increment = increment_;
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if (increment == 0) this->increment = 1;
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}
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inline Range::Range() : minVal(-1), maxVal(-1), increment(1) {}
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inline bool Range::allowed(int value) const {
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if (minVal < 0 && maxVal < 0) return true;
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if (value >= minVal && value <= maxVal) {
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int tmp = value - minVal;
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if ((tmp % increment) == 0) return true;
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}
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return false;
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}
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inline int Range::closest(int value) const {
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if (allowed(value))
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return value;
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else if (value < minVal)
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return minVal;
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else if (value > maxVal)
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return maxVal;
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// must be inbetween but not matched with increment
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int tmp = value - minVal;
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// try rounding to the nearest increment..
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tmp += (increment >> 1);
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tmp -= (tmp % increment);
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return closest(value + tmp);
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}
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inline int Range::min() const { return minVal; }
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inline int Range::max() const { return maxVal; }
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inline int Range::inc() const { return increment; }
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} // namespace encfs
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#endif
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