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- Implement NdisGetFirstBufferFromPacketSafe and NdisCopyFromPacketToPacketSafe

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svn path=/trunk/; revision=41013
This commit is contained in:
Cameron Gutman 2009-05-20 03:31:46 +00:00
parent 4f200eb46b
commit ccf3aa7ce8
1 changed files with 113 additions and 0 deletions
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113
reactos/drivers/network/ndis/ndis/buffer.c
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@ -963,6 +963,40 @@ NdisGetFirstBufferFromPacket(
}
}
/*
* @implemented
*/
VOID
EXPORT
NdisGetFirstBufferFromPacketSafe(
IN PNDIS_PACKET _Packet,
OUT PNDIS_BUFFER *_FirstBuffer,
OUT PVOID *_FirstBufferVA,
OUT PUINT _FirstBufferLength,
OUT PUINT _TotalBufferLength,
IN MM_PAGE_PRIORITY Priority)
{
PNDIS_BUFFER Buffer;
Buffer = _Packet->Private.Head;
*_FirstBuffer = Buffer;
if (Buffer != NULL) {
*_FirstBufferLength = MmGetMdlByteCount(Buffer);
*_FirstBufferVA = MmGetSystemAddressForMdlSafe(Buffer, Priority);
Buffer = Buffer->Next;
} else {
*_FirstBufferLength = 0;
*_FirstBufferVA = NULL;
}
*_TotalBufferLength = *_FirstBufferLength;
while (Buffer != NULL) {
*_TotalBufferLength += MmGetMdlByteCount(Buffer);
Buffer = Buffer->Next;
}
}
/*
* @implemented
@ -1207,4 +1241,83 @@ NdisSetPacketCancelId(
NDIS_SET_PACKET_CANCEL_ID(Packet, CancelId);
}
/*
* @implemented
*/
VOID
EXPORT
NdisCopyFromPacketToPacketSafe(
IN PNDIS_PACKET Destination,
IN UINT DestinationOffset,
IN UINT BytesToCopy,
IN PNDIS_PACKET Source,
IN UINT SourceOffset,
OUT PUINT BytesCopied,
IN MM_PAGE_PRIORITY Priority)
{
PNDIS_BUFFER SrcBuffer;
PNDIS_BUFFER DstBuffer;
PUCHAR DstData, SrcData;
UINT DstSize, SrcSize;
UINT Count, Total;
*BytesCopied = 0;
/* Skip DestinationOffset bytes in the destination packet */
NdisGetFirstBufferFromPacketSafe(Destination, &DstBuffer, (PVOID*)&DstData, &DstSize, &Total, Priority);
if (!DstData || SkipToOffset(DstBuffer, DestinationOffset, &DstData, &DstSize) == 0xFFFFFFFF)
return;
/* Skip SourceOffset bytes in the source packet */
NdisGetFirstBufferFromPacketSafe(Source, &SrcBuffer, (PVOID*)&SrcData, &SrcSize, &Total, Priority);
if (!SrcData || SkipToOffset(SrcBuffer, SourceOffset, &SrcData, &SrcSize) == 0xFFFFFFFF)
return;
/* Copy the data */
for (Total = 0;;) {
/* Find out how many bytes we can copy at one time */
if (BytesToCopy < SrcSize)
Count = BytesToCopy;
else
Count = SrcSize;
if (DstSize < Count)
Count = DstSize;
RtlCopyMemory(DstData, SrcData, Count);
Total += Count;
BytesToCopy -= Count;
if (BytesToCopy == 0)
break;
DstSize -= Count;
if (DstSize == 0) {
/* No more bytes in destination buffer. Proceed to
the next buffer in the destination buffer chain */
NdisGetNextBuffer(DstBuffer, &DstBuffer);
if (!DstBuffer)
break;
NdisQueryBufferSafe(DstBuffer, (PVOID)&DstData, &DstSize, Priority);
if (!DstData)
break;
}
SrcSize -= Count;
if (SrcSize == 0) {
/* No more bytes in source buffer. Proceed to
the next buffer in the source buffer chain */
NdisGetNextBuffer(SrcBuffer, &SrcBuffer);
if (!SrcBuffer)
break;
NdisQueryBufferSafe(SrcBuffer, (PVOID)&SrcData, &SrcSize, Priority);
if (!SrcData)
break;
}
}
*BytesCopied = Total;
}
/* EOF */