diff options
Diffstat (limited to '')
| -rw-r--r-- | private/ntos/ndis/dc21x4/copy.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/private/ntos/ndis/dc21x4/copy.c b/private/ntos/ndis/dc21x4/copy.c new file mode 100644 index 000000000..39442d2e5 --- /dev/null +++ b/private/ntos/ndis/dc21x4/copy.c @@ -0,0 +1,205 @@ +/*+ + * file: copy.c + * + * Copyright (C) 1992-1995 by + * Digital Equipment Corporation, Maynard, Massachusetts. + * All rights reserved. + * + * This software is furnished under a license and may be used and copied + * only in accordance of the terms of such license and with the + * inclusion of the above copyright notice. This software or any other + * copies thereof may not be provided or otherwise made available to any + * other person. No title to and ownership of the software is hereby + * transferred. + * + * The information in this software is subject to change without notice + * and should not be construed as a commitment by digital equipment + * corporation. + * + * Digital assumes no responsibility for the use or reliability of its + * software on equipment which is not supplied by digital. + * + * + * Abstract: This file is the part of the NDIS 4.0 miniport driver for DEC's + * DC21X4 Ethernet Adapter family. + * This module implements the routines to move data + * between NDIS packets and buffers + * + * Author: Philippe Klein + * + * Revision History: + * + * phk 28-Aug-1994 Initial entry + * +-*/ + +#include <precomp.h> + + + + + + + + +/*+ + * CopyFromPacketToBuffer + * + * Routine Description: + * + * Copy from an ndis packet into a buffer. + * + * Arguments: + * + * Packet - Source + * + * Offset - The offset whitin the packet of the first byte + * to copy + * + * Buffer - Destination + * + * BytesToCopy - The number of bytes to copy + * + * BytesCopied - The number of bytes actually copied. Can be less then + * BytesToCopy if the packet is shorter than BytesToCopy. + * + * Return Value: + * + * None + * +-*/ +extern +VOID +CopyFromPacketToBuffer ( + IN PNDIS_PACKET Packet, + IN UINT Offset, + IN PCHAR Buffer, + IN UINT BytesToCopy, + OUT PUINT BytesCopied + ) + +{ + + UINT NdisBufferCount; + PNDIS_BUFFER CurrentBuffer; + PVOID VirtualAddress; + UINT CurrentLength; + UINT LocalBytesCopied; + UINT AmountToMove; + + + NdisQueryPacket( + Packet, + NULL, + &NdisBufferCount, + &CurrentBuffer, + NULL + ); + + + // Check if zero length copy or null packet + + if (!BytesToCopy || !NdisBufferCount) { + *BytesCopied = 0; + return; + } + + // Get the first buffer. + + NdisQueryBuffer( + CurrentBuffer, + &VirtualAddress, + &CurrentLength + ); + + + LocalBytesCopied = 0; + + // If there is an offset move first to the beginning of the data + // block which may be in a subsequent buffer + + if (Offset) { + + while (Offset > CurrentLength) { + + // No data are copied from this buffer; + + Offset -= CurrentLength; + + //Get the next buffer + + NdisGetNextBuffer( + CurrentBuffer, + &CurrentBuffer + ); + + if (!CurrentBuffer) { + *BytesCopied = LocalBytesCopied; + return; + } + + NdisQueryBuffer( + CurrentBuffer, + &VirtualAddress, + &CurrentLength + ); + + } + + VirtualAddress = (PCHAR)VirtualAddress + Offset; + CurrentLength -= Offset; + } + + + // Copy the data + + while (LocalBytesCopied < BytesToCopy) { + + if (!CurrentLength) { + + //The current buffer has been fully copied + //Get the next one + + NdisGetNextBuffer( + CurrentBuffer, + &CurrentBuffer + ); + + if (!CurrentBuffer) { + // There is no more buffer. + break; + } + + NdisQueryBuffer( + CurrentBuffer, + &VirtualAddress, + &CurrentLength + ); + } + + // Copy the data. + + AmountToMove = min (CurrentLength , BytesToCopy - LocalBytesCopied); + + MOVE_MEMORY( + Buffer, + VirtualAddress, + AmountToMove + ); + + LocalBytesCopied += AmountToMove; + CurrentLength -= AmountToMove; + + Buffer = (PCHAR)Buffer + AmountToMove; + VirtualAddress = (PCHAR)VirtualAddress + AmountToMove; + + } + + *BytesCopied = LocalBytesCopied; + +} + + + + + |