public IB Reserve(AllocationInfo allocationInfo)
{
amapRegionUpdater.Update(
allocationInfo.MapOffset,
map =>
{
var bits = map.Data.Value.ToBits();
for (var i = allocationInfo.BitStartIndex; i <= allocationInfo.BitEndIndex; i++)
{
bits[i] = 1;
}
var bytes = bits.ToBytes();
return
(new AMap(
BinaryData.OfValue(bytes),
new PageTrailer(
Constants.ptypeAMap,
Constants.ptypeAMap,
0x0000,
Crc32.ComputeCrc32(bytes),
BID.OfValue(allocationInfo.MapOffset))));
});
var allocateSize = (allocationInfo.BitEndIndex - allocationInfo.BitStartIndex + 1) * 64;
headerUsageProvider.Use(header => header.SetRoot(header.Root.SetFreeSpaceInAllAMaps(header.Root.AMapFree - allocateSize)));
return(IB.OfValue(allocationInfo.MapOffset + allocationInfo.BitStartIndex * 64));
}
private FPMap CreateFPMap(long mapOffset)
{
var data = BinaryData.OfSize(496, 0xFF);
return
(new FPMap(
data,
new PageTrailer(
Constants.ptypeFPMap,
Constants.ptypeFPMap,
0x0000,
(int)Crc32.ComputeCrc32(data.Value),
BID.OfValue(mapOffset))));
}
private AMap CreateAMap(long mapOffset, params byte[] defaultAllocations)
{
var data = new byte[496];
for (var i = 0; i < defaultAllocations.Length; i++)
{
data[i] = defaultAllocations[i];
}
return
(new AMap(
BinaryData.OfValue(data),
new PageTrailer(
Constants.ptypeAMap,
Constants.ptypeAMap,
0x0000,
(int)Crc32.ComputeCrc32(data),
BID.OfValue(mapOffset))));
}