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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| /******************************************************************************* | ||
| Copyright(c) 2015-2020 Parker Hannifin Corp. All rights reserved. | ||
| MIT Licensed. See the included LICENSE.txt for a copy of the full MIT License. | ||
| *******************************************************************************/ | ||
| #include "stdafx.h" | ||
|
|
||
| #include "Bitfield.h" | ||
|
|
||
| namespace mscl | ||
| { | ||
| uint64 Bitfield::get(uint64 mask, bool shiftToLsb) const | ||
| { | ||
| uint64 getVal = m_value & mask; | ||
|
|
||
| if (!shiftToLsb) | ||
| { | ||
| return getVal; | ||
| } | ||
|
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| return getVal >> shiftCount(mask); | ||
| } | ||
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| void Bitfield::set(uint64 mask, uint64 value, bool shiftRequired) | ||
| { | ||
| clear(mask); | ||
|
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| // if value was 0, just need to clear | ||
| if (value == 0) | ||
| { | ||
| return; | ||
| } | ||
|
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| // bitshift value to put it in the right spot in the bitfield | ||
| uint64 setVal = value; | ||
|
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| if (shiftRequired) | ||
| { | ||
| setVal = setVal << shiftCount(mask); | ||
| } | ||
|
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| // or the set value into the complete value now that it's in the correct place | ||
| m_value = m_value | setVal; | ||
| } | ||
|
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| void Bitfield::clear(uint64 mask) | ||
| { | ||
| uint64 clearMap = 0xFFFFFFFFFFFFFFFF ^ mask; | ||
| m_value = m_value & clearMap; | ||
| } | ||
|
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| uint8 Bitfield::shiftCount(uint64 mask) | ||
| { | ||
| // shift until all zeros removed from right-hand side of map (least significant bit is 1) | ||
| uint64 shiftMap = mask; | ||
| uint8 count = 0; | ||
| while (shiftMap % 2 != 1) | ||
| { | ||
| shiftMap = shiftMap >> 1; | ||
| count++; | ||
| } | ||
|
|
||
| return count; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /******************************************************************************* | ||
| Copyright(c) 2015-2020 Parker Hannifin Corp. All rights reserved. | ||
| MIT Licensed. See the included LICENSE.txt for a copy of the full MIT License. | ||
| *******************************************************************************/ | ||
|
|
||
| #pragma once | ||
|
|
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| #include "mscl/Types.h" | ||
|
|
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| namespace mscl | ||
| { | ||
| class Bitfield | ||
| { | ||
| public: | ||
| //Constructor: Bitfield | ||
| // Constructs Bitfield object with value 0 | ||
| Bitfield() {}; | ||
|
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| //Constructor: Bitfield | ||
| // Constructs Bitfield object with indicated value | ||
| // | ||
| //Parameters: | ||
| // val - uint64 bitfield value | ||
| Bitfield(uint64 val) : | ||
| m_value(val) | ||
| {}; | ||
|
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| //Destructor: ~Bitfield | ||
| // Default destructor for the Bitfield object | ||
| virtual ~Bitfield() {}; | ||
|
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| private: | ||
| //Variable: m_value | ||
| // The bitfield value | ||
| uint64 m_value; | ||
|
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| public: | ||
| //Function: value | ||
| // Gets or sets the entire underlying bitfield value | ||
| uint64 value() const { return m_value; } | ||
| void value(uint64 val) { m_value = val; } | ||
|
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| //Function: get | ||
| // Gets the value of only the bits masked by the indicated mask. | ||
| // | ||
| //Parameters: | ||
| // mask - uint64 indicating which bits to evaluate | ||
| // shiftToLsb - true: return the masked bits shifted all the way to the right, false: return the masked bits in their original position | ||
| // | ||
| //Returns: | ||
| // uint64 - the masked value | ||
| uint64 get(uint64 mask, bool shiftToLsb = true) const; | ||
|
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| //Function: set | ||
| // Sets the provided value to the position indicated by the indicated mask | ||
| // | ||
| //Parameters: | ||
| // mask - uint64 indicating the position to place the value | ||
| // value - uint64 value to set | ||
| // shiftRequired - true: provided value needs to be shifted to the masked position before being set, false: provided value already in the correct position within the bitfield | ||
| void set(uint64 mask, uint64 value, bool shiftRequired = true); | ||
|
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| protected: | ||
| //Function: clear | ||
| // Sets all bits under the indicated mask to 0. | ||
| // | ||
| //Parameters: | ||
| // mask - uint64 mask indicating the position of the bits to clear | ||
| void clear(uint64 mask); | ||
|
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| private: | ||
| //Function shiftCount | ||
| // Calculate the number of bits to shift the mask value so that the least significant bit is 1 (mask shifted all the way to the right). | ||
| // | ||
| //Parameters: | ||
| // mask - uint64 mask to calculate shift count for | ||
| static uint8 shiftCount(uint64 mask); | ||
| }; | ||
| } |
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