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55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/*
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* PROJECT: Skiplist implementation for the ReactOS Project
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* LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
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* PURPOSE: Interfaces for the Skiplist
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* COPYRIGHT: Copyright 2015 Colin Finck (colin@reactos.org)
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*/
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#ifndef _REACTOS_SKIPLIST_H
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#define _REACTOS_SKIPLIST_H
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// Define SKIPLIST_LEVELS to a value between 1 and 31 before including this header.
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// This specifies the maximum number of levels you want your Skiplist to have.
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// A value of X is recommended for handling up to 2^X elements.
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#ifndef SKIPLIST_LEVELS
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#error Please define SKIPLIST_LEVELS to a value between 1 and 31.
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#endif
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C_ASSERT(SKIPLIST_LEVELS >= 1);
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C_ASSERT(SKIPLIST_LEVELS <= 31);
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// Function pointer definitions
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typedef PVOID (WINAPI *PSKIPLIST_ALLOCATE_ROUTINE)(DWORD);
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typedef int (WINAPI *PSKIPLIST_COMPARE_ROUTINE)(PVOID, PVOID);
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typedef void (WINAPI *PSKIPLIST_FREE_ROUTINE)(PVOID);
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// Structure definitions
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typedef struct _SKIPLIST_NODE
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{
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DWORD Distance[SKIPLIST_LEVELS];
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struct _SKIPLIST_NODE* Next[SKIPLIST_LEVELS];
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PVOID Element;
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}
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SKIPLIST_NODE, *PSKIPLIST_NODE;
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typedef struct _SKIPLIST
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{
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SKIPLIST_NODE Head;
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CHAR MaximumLevel;
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DWORD NodeCount;
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PSKIPLIST_ALLOCATE_ROUTINE AllocateRoutine;
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PSKIPLIST_COMPARE_ROUTINE CompareRoutine;
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PSKIPLIST_FREE_ROUTINE FreeRoutine;
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}
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SKIPLIST, *PSKIPLIST;
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// Function prototypes
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void InitializeSkiplist(PSKIPLIST Skiplist, PSKIPLIST_ALLOCATE_ROUTINE AllocateRoutine, PSKIPLIST_COMPARE_ROUTINE CompareRoutine, PSKIPLIST_FREE_ROUTINE FreeRoutine);
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BOOL InsertElementSkiplist(PSKIPLIST Skiplist, PVOID Element);
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BOOL InsertTailElementSkiplist(PSKIPLIST Skiplist, PVOID Element);
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PVOID DeleteElementSkiplist(PSKIPLIST Skiplist, PVOID Element);
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PVOID LookupElementSkiplist(PSKIPLIST Skiplist, PVOID Element, PDWORD ElementIndex);
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PSKIPLIST_NODE LookupNodeByIndexSkiplist(PSKIPLIST Skiplist, DWORD ElementIndex);
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#endif
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