159 lines
3.4 KiB
C
159 lines
3.4 KiB
C
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/*++
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Copyright (c) 1997 - 98, Microsoft Corporation
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Module Name:
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pattrie.h
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Abstract:
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Contains interface for a best matching
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prefix lookup using an PATRICIA trie.
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Author:
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Chaitanya Kodeboyina (chaitk) 26-Sep-1998
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Revision History:
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--*/
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#ifndef __ROUTING_PATLOOKUP_H__
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#define __ROUTING_PATLOOKUP_H__
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#include "lookup.h"
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#define Print printf
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#define BITS_IN_BYTE 8
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#define NODE_KEY_SIZE sizeof(ULONG)
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//
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// Direction in Iterator
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//
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#define LCHILD 0
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#define RCHILD 1
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#define PARENT 2
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typedef INT PAT_CHILD, *PPAT_CHILD;
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//
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// A node in the PAT trie
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//
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typedef struct _PAT_NODE *PPAT_NODE;
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typedef struct _PAT_NODE
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{
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PPAT_NODE Child[2]; // Pointers to left & right child nodes
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PVOID Data; // Opaque Pointer to data in the node
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USHORT NumBits; // Actual number of bits in this node
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ULONG KeyBits; // Value of bits to match in this node
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}
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PAT_NODE;
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//
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// PAT trie for prefix matching
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//
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typedef struct _PAT_TRIE
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{
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PPAT_NODE TrieRoot; // Pointer to the PAT trie
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USHORT MaxKeyBytes; // Max num of bytes in key
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USHORT NumNodes; // Number of nodes in trie
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#if PROF
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ULONG MemoryInUse; // Total memory in use now
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UINT NumAllocs; // Num of total allocations
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UINT NumFrees; // Num of total free allocs
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UINT NumInsertions; // Num of total insertions
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UINT NumDeletions; // Num of total deletions
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#endif
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}
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PAT_TRIE, *PPAT_TRIE;
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//
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// Lookup context for a PAT trie
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//
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typedef struct _PAT_CONTEXT
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{
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PVOID BestNode; // Node with best the matching prefix
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PVOID InsPoint; // Node to which new node is attached
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PAT_CHILD InsChild; // Node should attached as this child
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}
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PAT_CONTEXT, *PPAT_CONTEXT;
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//
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// Linkage Info Kept in Data
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//
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typedef struct _PAT_LINKAGE
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{
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PPAT_NODE NodePtr; // Back pointer to the owning node
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}
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PAT_LINKAGE, *PPAT_LINKAGE;
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#define SET_NODEPTR_INTO_DATA(Data, Node) ((PPAT_LINKAGE)Data)->NodePtr = Node
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#define GET_NODEPTR_FROM_DATA(Data) ((PPAT_LINKAGE)Data)->NodePtr
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//
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// Macros for doing bit operations on keys
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//
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//
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// MaskBitsArr[i] = First 'i' bits set to 1
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//
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const ULONG MaskBitsArr[] =
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{
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0x00000000, 0x80000000, 0xC0000000, 0xE0000000,
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0xF0000000, 0xF8000000, 0xFC000000, 0xFE000000,
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0xFF000000, 0xFF800000, 0xFFC00000, 0xFFE00000,
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0xFFF00000, 0xFFF80000, 0xFFFC0000, 0xFFFE0000,
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0xFFFF0000, 0xFFFF8000, 0xFFFFC000, 0xFFFFE000,
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0xFFFFF000, 0xFFFFF800, 0xFFFFFC00, 0xFFFFFE00,
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0xFFFFFF00, 0xFFFFFF80, 0xFFFFFFC0, 0xFFFFFFE0,
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0xFFFFFFF0, 0xFFFFFFF8, 0xFFFFFFFC, 0xFFFFFFFE,
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0xFFFFFFFF
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};
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#define PickMostSigNBits(ul, nb) ((ul) >> (NODE_KEY_SIZE - nb))
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#define MaskBits(nb) MaskBitsArr[nb]
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//
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// Key Compare/Copy inlines
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//
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// Disable warnings for no return value
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#pragma warning(disable:4035)
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__inline
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ULONG
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RtmUlongByteSwap(
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IN ULONG Value
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)
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{
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__asm
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{
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mov eax, Value
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bswap eax
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}
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}
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#pragma warning(default:4035)
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#define RtlUlongByteSwap RtmUlongByteSwap
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#endif //__ROUTING_PATLOOKUP_H__
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