public static bool Find(IBinarySearchRangeData <PropertyDatabaseRecordKey> store, PropertyDatabaseRecordKey recordKey, out long index)
{
if (store.length == 0)
{
index = 0;
return(false);
}
var searchRange = new BinarySearchRange()
{
startOffset = 0, endOffset = store.length, halfOffset = store.length / 2
};
while (true)
{
index = searchRange.halfOffset;
var currentRecordKey = store[index];
if (recordKey == currentRecordKey)
{
index = searchRange.halfOffset;
return(true);
}
if (recordKey < currentRecordKey)
{
searchRange.endOffset = searchRange.halfOffset;
searchRange.halfOffset = searchRange.startOffset + (searchRange.endOffset - searchRange.startOffset) / 2;
if (searchRange.halfOffset == searchRange.endOffset)
{
break;
}
}
else
{
searchRange.startOffset = searchRange.halfOffset;
searchRange.halfOffset = searchRange.startOffset + (searchRange.endOffset - searchRange.startOffset) / 2;
if (searchRange.halfOffset == searchRange.startOffset)
{
++index;
break;
}
}
}
return(false);
}
public static BinarySearchRange FindRange <TRangeData>(IBinarySearchRange <TRangeData> range, IBinarySearchRangeData <TRangeData> data)
{
#if PACKAGE_PERFORMANCE_TRACKING
// using (new PerformanceTracker(nameof(FindRange)))
#endif
{
var nbValues = data.length;
if (nbValues == 0)
{
return(BinarySearchRange.invalid);
}
var binarySearchRangeStart = new BinarySearchRange {
startOffset = 0, endOffset = nbValues, halfOffset = nbValues / 2
};
var binarySearchRangeEnd = new BinarySearchRange {
startOffset = 0, endOffset = nbValues, halfOffset = nbValues / 2
};
var foundStartOffset = false;
var foundEndOffset = false;
while (!foundStartOffset || !foundEndOffset)
{
if (!foundStartOffset)
{
// Update StartIndex
var startValue = data[binarySearchRangeStart.halfOffset];
if (range.StartIsInRange(startValue))
{
binarySearchRangeStart.endOffset = binarySearchRangeStart.halfOffset;
binarySearchRangeStart.halfOffset = binarySearchRangeStart.startOffset + (binarySearchRangeStart.endOffset - binarySearchRangeStart.startOffset) / 2;
if (binarySearchRangeStart.endOffset == binarySearchRangeStart.halfOffset)
{
foundStartOffset = true;
}
}
else
{
// value is outside of the file
if (binarySearchRangeStart.halfOffset >= nbValues - 1)
{
return(BinarySearchRange.invalid);
}
binarySearchRangeStart.startOffset = binarySearchRangeStart.halfOffset;
binarySearchRangeStart.halfOffset = binarySearchRangeStart.startOffset + (binarySearchRangeStart.endOffset - binarySearchRangeStart.startOffset) / 2;
if (binarySearchRangeStart.startOffset == binarySearchRangeStart.halfOffset)
{
foundStartOffset = true;
}
}
}
if (!foundEndOffset)
{
// Update EndIndex
var endValue = data[binarySearchRangeEnd.halfOffset];
if (range.EndIsInRange(endValue))
{
binarySearchRangeEnd.startOffset = binarySearchRangeEnd.halfOffset;
binarySearchRangeEnd.halfOffset = binarySearchRangeEnd.startOffset + (binarySearchRangeEnd.endOffset - binarySearchRangeEnd.startOffset) / 2;
if (binarySearchRangeEnd.startOffset == binarySearchRangeEnd.halfOffset)
{
foundEndOffset = true;
}
}
else
{
// value is outside of the file
if (binarySearchRangeEnd.halfOffset == 0)
{
return(BinarySearchRange.invalid);
}
binarySearchRangeEnd.endOffset = binarySearchRangeEnd.halfOffset;
binarySearchRangeEnd.halfOffset = binarySearchRangeEnd.startOffset + (binarySearchRangeEnd.endOffset - binarySearchRangeEnd.startOffset) / 2;
if (binarySearchRangeEnd.endOffset == binarySearchRangeEnd.halfOffset)
{
foundEndOffset = true;
}
}
}
}
// We take the endOffset because we know the values of interests lie on these offset.
return(new BinarySearchRange {
startOffset = binarySearchRangeStart.endOffset, endOffset = binarySearchRangeEnd.endOffset
});
}
}
public static BinarySearchRange FindMaskRange(IBinarySearchRangeData <PropertyDatabaseRecordKey> store, ulong documentKeyMask)
{
var range = new PropertyDatabaseDocumentKeyMaskRange(documentKeyMask);
return(BinarySearchFinder.FindRange(range, store));
}
public static BinarySearchRange FindHiWordRange(IBinarySearchRangeData <PropertyDatabaseRecordKey> store, uint documentKeyHiWord)
{
var range = new PropertyDatabaseDocumentKeyHiWordRange(documentKeyHiWord);
return(BinarySearchFinder.FindRange(range, store));
}
