/// <summary>Flush the cache to <see cref="BaseStream"/> with <see cref="kWordByteCount"/> or fewer bytes bytes</summary>
void FlushCache()
{
#if !CONTRACTS_FULL_SHIM // can't do this with our shim! ValueAtReturn sets out param to default ON ENTRY
Contract.Ensures(Contract.ValueAtReturn(out mCache) == 0);
Contract.Ensures(Contract.ValueAtReturn(out mCacheBitIndex) == 0);
#endif
if (mCacheBitIndex == 0) // no bits to flush!
{
Contract.Assert(mCache == 0, "Why is there data in the cache?");
return;
}
mCacheBitsStreamedCount = 0;
int byte_count = (mCacheBitIndex - 1) >> Bits.kByteBitShift; // number of bytes to try and write
int shift = kWordBitCount - Bits.kByteBitCount; // start shifting from the MSB
while ( /*!IsEndOfStream &&*/
byte_count >= 0)
{
mIoBuffer[0] = (byte)(mCache >> shift);
BaseStream.Write(mIoBuffer, 0, sizeof(byte));
--byte_count;
shift -= Bits.kByteBitCount;
mCacheBitsStreamedCount += Bits.kByteBitCount;
}
if (byte_count != -1 && ThrowOnOverflow.CanWrite())
{
throw new System.IO.EndOfStreamException("Tried to write more bits than the stream has/can see");
}
mCache = 0;
mCacheBitIndex = 0;
}
/// <summary>Restore the cursor to what it was before the corresponding call to a <see cref="WriteElementBegin(string, XmlElement&)"/></summary>
public void WriteElementEnd(ref TCursor oldCursor)
{
#if !CONTRACTS_FULL_SHIM // can't do this with our shim! ValueAtReturn sets out param to default ON ENTRY
Contract.Ensures(Contract.ValueAtReturn(out oldCursor) == null);
#endif
RestoreCursor(ref oldCursor);
}
/// <summary>Get the procedure for building a mask of a section of bits in a vector, relative to the vector's element size (<see cref="System.Int64"/>)</summary>
/// <param name="proc"></param>
/// <param name="byteOrder">Order in which bits are enumerated (first to last)</param>
public static void GetVectorElementSectionBitMaskInT(out VectorElementBitMask <ulong> proc,
Shell.EndianFormat byteOrder = kVectorWordFormat)
{
Contract.Ensures(Contract.ValueAtReturn(out proc) != null);
proc = byteOrder == Shell.EndianFormat.Big
? (VectorElementBitMask <ulong>)VectorElementSectionBitMaskInInt64BE
: (VectorElementBitMask <ulong>)VectorElementSectionBitMaskInInt64LE;
}
/// <summary>Returns the cursor to a previously saved cursor value</summary>
/// <param name="oldCursor">Previously saved cursor. Set to null before the method returns</param>
public void RestoreCursor(ref TCursor oldCursor)
{
#if !CONTRACTS_FULL_SHIM // can't do this with our shim! ValueAtReturn sets out param to default ON ENTRY
Contract.Ensures(Contract.ValueAtReturn(out oldCursor) == null);
#endif
Contract.Assert(oldCursor != null, "Can't restore a cursor that wasn't saved!");
Cursor = oldCursor;
oldCursor = null;
}
/// <summary>Generate an 32-bit bit count to bitmask table</summary>
/// <param name="wordBitSize">Number of bits to generate a table for</param>
/// <param name="lut">Bitmask look up table</param>
/// <remarks>Treat <paramref name="lut"/> as <b>read-only</b></remarks>
public static void BitmaskLookUpTableGenerate(int wordBitSize, out uint[] lut)
{
Contract.Requires/*<ArgumentOutOfRangeException>*/ (wordBitSize > 0 && wordBitSize <= kUInt32BitCount);
Contract.Ensures(Contract.ValueAtReturn(out lut) != null);
if (wordBitSize == kUInt32BitCount && kBitmaskLookup32 != null)
{
lut = kBitmaskLookup32;
}
else
{
lut = new uint[BitmaskLookUpTableGetLength(wordBitSize)];
for (int x = 1, shift = lut.Length - 2; x < lut.Length; x++, shift--)
{
lut[x] = (uint)(uint.MaxValue >> shift);
}
}
}
public override void ReadElementEnd(ref TCursor oldCursor)
{
Contract.Ensures(Contract.ValueAtReturn(out oldCursor) == null);
throw new NotImplementedException();
}
public static void GetVectorElementFromBufferInT(out VectorElementFromBuffer <ulong> proc)
{
Contract.Ensures(Contract.ValueAtReturn(out proc) != null);
proc = VectorElementFromBufferInT;
}
