// A very simple and efficient array copy that assumes all of the
// parameter validation has already been done. All counts here are
// in bytes.
internal static unsafe void InternalBlockCopy(Array src, int srcOffset,
Array dst, int dstOffset,
int count)
{
VTable.Assert(src != null);
VTable.Assert(dst != null);
// Unfortunately, we must do a check to make sure we're writing
// within the bounds of the array. This will ensure that we don't
// overwrite memory elsewhere in the system nor do we write out junk.
// This can happen if multiple threads screw with our IO classes
// simultaneously without being threadsafe. Throw here.
int srcLen = src.Length * src.vtable.arrayElementSize;
if (srcOffset < 0 || dstOffset < 0 || count < 0 ||
srcOffset > srcLen - count)
{
throw new IndexOutOfRangeException
("IndexOutOfRange_IORaceCondition");
}
if (src == dst)
{
if (dstOffset > srcLen - count)
{
throw new IndexOutOfRangeException
("IndexOutOfRange_IORaceCondition");
}
}
else
{
int dstLen = dst.Length * dst.vtable.arrayElementSize;
if (dstOffset > dstLen - count)
{
throw new IndexOutOfRangeException
("IndexOutOfRange_IORaceCondition");
}
}
// Copy the data.
// Call our faster version of memmove, not the CRT one.
fixed(int *srcFieldPtr = &src.field1)
{
fixed(int *dstFieldPtr = &dst.field1)
{
byte *srcPtr = (byte *)
src.GetFirstElementAddress(srcFieldPtr);
byte *dstPtr = (byte *)
dst.GetFirstElementAddress(dstFieldPtr);
MoveMemory(dstPtr + dstOffset, srcPtr + srcOffset, count);
}
}
}
private unsafe static void CloneVectorContents(Array srcArray,
Array dstArray)
{
int srcLength = srcArray.Length;
fixed(int *srcFieldPtr = &srcArray.field1)
{
fixed(int *dstFieldPtr = &dstArray.field1)
{
byte *srcDataPtr = (byte *)
srcArray.GetFirstElementAddress(srcFieldPtr);
byte *dstDataPtr = (byte *)
dstArray.GetFirstElementAddress(dstFieldPtr);
int size = srcArray.vtable.arrayElementSize * srcLength;
Buffer.MoveMemory(dstDataPtr, srcDataPtr, size);
}
}
}
private unsafe static void CloneArrayContents(Array srcArray,
Array dstArray)
{
int srcLength = srcArray.Length;
fixed(int *srcFieldPtr = &srcArray.field1)
{
fixed(int *dstFieldPtr = &dstArray.field1)
{
byte *srcDataPtr = (byte *)
srcArray.GetFirstElementAddress(srcFieldPtr);
byte *dstDataPtr = (byte *)
dstArray.GetFirstElementAddress(dstFieldPtr);
byte *srcDimPtr = (byte *)
srcArray.GetFirstDimInfoRectangleArray();
int dimInfoSize = (int)(srcDataPtr - srcDimPtr);
int size = srcArray.vtable.arrayElementSize * srcLength;
Buffer.MoveMemory(dstDataPtr - dimInfoSize,
srcDataPtr - dimInfoSize,
size + dimInfoSize);
}
}
}
public static unsafe void InitArray(System.Array srcArray,
System.Array dstArray)
{
#if !REFERENCE_COUNTING_GC && !DEFERRED_REFERENCE_COUNTING_GC
Barrier.ArrayCopy(srcArray, 0, dstArray, 0, srcArray.Length);
#else
fixed(int *srcFieldPtr = &srcArray.field1)
{
void *src = srcArray.GetFirstElementAddress(srcFieldPtr);
fixed(int *dstFieldPtr = &dstArray.field1)
{
void *dst = dstArray.GetFirstElementAddress(dstFieldPtr);
int size = (srcArray.vtable.arrayElementSize *
srcArray.Length);
#if REFERENCE_COUNTING_GC
if (dstArray.vtable.arrayOf ==
StructuralType.Reference ||
dstArray.vtable.arrayOf ==
StructuralType.Struct)
{
int dstLength =
size / dstArray.vtable.arrayElementSize;
GCs.ReferenceCountingCollector.
IncrementReferentRefCounts(Magic.addressOf(srcArray),
srcArray.vtable,
0,
srcArray.Length);
GCs.ReferenceCountingCollector.
DecrementReferentRefCounts(Magic.addressOf(dstArray),
dstArray.vtable,
0,
dstLength);
}
#elif DEFERRED_REFERENCE_COUNTING_GC
if (dstArray.vtable.arrayOf ==
StructuralType.Reference ||
dstArray.vtable.arrayOf ==
StructuralType.Struct)
{
int dstLength =
size / dstArray.vtable.arrayElementSize;
GCs.DeferredReferenceCountingCollector.
IncrementReferentRefCounts(Magic.addressOf(srcArray),
srcArray.vtable,
0,
srcArray.Length);
GCs.DeferredReferenceCountingCollector.
DecrementReferentRefCounts(Magic.addressOf(dstArray),
dstArray.vtable,
0,
dstLength);
}
#endif // REFERENCE_COUNTING_GC
System.IO.__UnmanagedMemoryStream.memcpyimpl
((byte *)src, (byte *)dst, size);
}
}
#endif // REFERENCE_COUNTING_GC
}
