private void WriteAlignedBlobHeap(BlobBuilder writer)
{
int heapStart = writer.Position;
// ensure enough space in the buffer:
writer.SetPosition(writer.Position + _blobHeapSize);
// Perf consideration: With large heap the following loop may cause a lot of cache misses
// since the order of entries in _blobs dictionary depends on the hash of the array values,
// which is not correlated to the heap index. If we observe such issue we should order
// the entries by heap position before running this loop.
foreach (var entry in _blobs)
{
int heapOffset = entry.Value.HeapPosition;
var blob = entry.Key;
writer.SetPosition(heapStart + heapOffset);
writer.WriteCompressedInteger((uint)blob.Length);
writer.WriteBytes(blob);
}
Debug.Assert(writer.Length - heapStart == _blobHeapSize);
// add padding:
writer.SetPosition(writer.Length);
writer.WriteBytes(0, BitArithmeticUtilities.Align(_blobHeapSize, 4) - _blobHeapSize);
}
private static BlobBuilder SerializeRecord(byte kind, Action <BlobBuilder> data)
{
var cmw = new BlobBuilder();
cmw.WriteByte(CDI.CdiVersion);
cmw.WriteByte(kind);
cmw.WriteByte(0);
// alignment size (will be patched)
int alignmentSizeAndLengthPosition = cmw.Position;
cmw.WriteByte(0);
// length (will be patched)
cmw.WriteUInt32(0);
data(cmw);
int length = cmw.Position;
int alignedLength = 4 * ((length + 3) / 4);
byte alignmentSize = (byte)(alignedLength - length);
for (int i = 0; i < alignmentSize; i++)
{
cmw.WriteByte(0);
}
cmw.SetPosition(alignmentSizeAndLengthPosition);
cmw.WriteByte(alignmentSize);
cmw.WriteUInt32((uint)alignedLength);
cmw.SetPosition(length);
return(cmw);
}
private static BlobBuilder SerializeRecord(byte kind, Action<BlobBuilder> data)
{
var cmw = new BlobBuilder();
cmw.WriteByte(CDI.CdiVersion);
cmw.WriteByte(kind);
cmw.WriteByte(0);
// alignment size (will be patched)
int alignmentSizeAndLengthPosition = cmw.Position;
cmw.WriteByte(0);
// length (will be patched)
cmw.WriteUInt32(0);
data(cmw);
int length = cmw.Position;
int alignedLength = 4 * ((length + 3) / 4);
byte alignmentSize = (byte)(alignedLength - length);
for (int i = 0; i < alignmentSize; i++)
{
cmw.WriteByte(0);
}
cmw.SetPosition(alignmentSizeAndLengthPosition);
cmw.WriteByte(alignmentSize);
cmw.WriteUInt32((uint)alignedLength);
cmw.SetPosition(length);
return cmw;
}