NdisCopyFromPacketToPacket

NdisCopyFromPacketToPacket

VOID
   NdisCopyFromPacketToPacket(
       IN PNDIS_PACKET Destination,
       IN UINT DestinationOffset,
       IN UINT BytesToCopy,
       IN PNDIS_PACKET Source,
       IN UINT SourceOffset,
       OUT PUINT BytesCopied
       );

NdisCopyFromPacketToPacket copies a specified range of data from one packet to another.

Parameters

Destination

Points to the destination packet descriptor.

DestinationOffset

Specifies the byte offset within the destination packet at which to begin writing the copied data.

BytesToCopy

Specifies the number of bytes to copy.

Source

Points to the source packet descriptor.

SourceOffset

Specifies the byte offset within the source packet at which to begin copying the data.

BytesCopied

Points to the caller-supplied variable in which this function returns the number of bytes actually copied. This number can be less than the value of BytesToCopy if the source packet runs out of data or the destination packet runs out of space.

Comments

The caller of NdisCopyFromPacketToPacket allocates the destination packet, if not the source packet as well. The packet descriptor of the destination packet should have enough chained buffer descriptors to receive the data.

If the source packet runs out of data or the destination packet out of space before the specified number of bytes has been copied, the copy operation stops. In either case, NdisCopyFromPacketToPacket returns the number of bytes successfully copied from the source to the destination packet.

NdisCopyFromPacketToPacket does not copy any out-of-band information associated with the given Source to the Destination. To copy this information, the driver can use pointers returned by NDIS_OOB_DATA_FROM_PACKET and then call NdisMoveMemory.

The driver must release any spin lock it is holding before calling NdisCopyFromPacketToPacket.

Callers of NdisCopyFromPacketToPacket run at IRQL <= DISPATCH_LEVEL.