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Add a ScaledData() getter that scales the data to the desired bit width and 

converts the signed-ness as specified.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41843 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Michael Lotz 2011-05-30 21:45:10 +00:00
parent e761436dee
commit d75a906285
2 changed files with 32 additions and 2 deletions
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29
src/add-ons/kernel/drivers/input/usb_hid/HIDReportItem.cpp
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@ -1,5 +1,5 @@
/*
* Copyright 2009, Michael Lotz, mmlr@mlotz.ch.
* Copyright 2009-2011, Michael Lotz, mmlr@mlotz.ch.
* Distributed under the terms of the MIT License.
*/
@ -21,6 +21,7 @@ HIDReportItem::HIDReportItem(HIDReport *report, uint32 bitOffset,
fByteOffset(bitOffset / 8),
fShift(bitOffset % 8),
fMask(~(0xffffffff << bitLength)),
fBitCount(bitLength),
fHasData(hasData),
fArray(isArray),
fRelative(isRelative),
@ -114,6 +115,32 @@ HIDReportItem::SetData(uint32 data)
}
uint32
HIDReportItem::ScaledData(uint8 scaleToBits, bool toBeSigned)
{
uint32 source = fData;
if (Signed() && !toBeSigned)
source = (uint32)((int32)fData - (int32)fMinimum);
if (fBitCount == scaleToBits)
return source;
int8 shift;
uint32 result = 0;
do {
shift = scaleToBits - fBitCount;
if (shift > 0) {
result |= source << shift;
scaleToBits = shift;
} else
result |= source >> -shift;
} while (shift > 0);
return result;
}
void
HIDReportItem::PrintToStream(uint32 indentLevel)
{

5
src/add-ons/kernel/drivers/input/usb_hid/HIDReportItem.h
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@ -1,5 +1,5 @@
/*
* Copyright 2009, Michael Lotz, mmlr@mlotz.ch.
* Copyright 2009-2011, Michael Lotz, mmlr@mlotz.ch.
* Distributed under the terms of the MIT License.
*/
#ifndef HID_REPORT_ITEM_H
@ -36,6 +36,8 @@ public:
status_t SetData(uint32 data);
uint32 Data() { return fData; };
uint32 ScaledData(uint8 scaleToBits, bool toBeSigned);
bool Valid() { return fValid; };
void PrintToStream(uint32 indentLevel = 0);
@ -44,6 +46,7 @@ private:
uint32 fByteOffset;
uint8 fShift;
uint32 fMask;
uint8 fBitCount;
bool fHasData;
bool fArray;
bool fRelative;