| 1 | /* $Id: avl.h,v 1.2 2000-01-22 18:20:59 bird Exp $
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| 2 | *
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| 3 | * AVL-Tree (lookalike) declaration.
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| 4 | *
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| 5 | * Copyright (c) 1999 knut st. osmundsen
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| 6 | *
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| 7 | * Project Odin Software License can be found in LICENSE.TXT
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| 8 | *
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| 9 | */
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| 10 | #ifndef _AVL_H_
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| 11 | #define _AVL_H_
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| 12 |
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| 13 | #ifdef __cplusplus
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| 14 | extern "C" {
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| 15 | #endif
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| 16 |
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| 17 | /*
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| 18 | * AVL configuration. PRIVATE!
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| 19 | */
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| 20 | #define AVL_MAX_HEIGHT 19 /* Up to 2^16 nodes. */
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| 21 |
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| 22 | /**
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| 23 | * AVL key type
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| 24 | */
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| 25 | typedef unsigned long AVLKEY;
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| 26 |
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| 27 | /**
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| 28 | * AVL Core node.
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| 29 | */
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| 30 | typedef struct _AVLNodeCore
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| 31 | {
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| 32 | AVLKEY Key; /* Key value. */
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| 33 | struct _AVLNodeCore * pLeft; /* Pointer to left leaf node. */
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| 34 | struct _AVLNodeCore * pRight; /* Pointer to right leaf node. */
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| 35 | unsigned char uchHeight; /* Height of this tree: max(heigth(left), heigth(right)) + 1 */
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| 36 | } AVLNODECORE, *PAVLNODECORE, **PPAVLNODECORE;
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| 37 |
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| 38 | /**
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| 39 | * AVL Enum data - All members are PRIVATE! Don't touch!
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| 40 | */
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| 41 | typedef struct _AVLEnumData
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| 42 | {
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| 43 | char fFromLeft;
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| 44 | char cEntries;
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| 45 | char achFlags[AVL_MAX_HEIGHT];
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| 46 | PAVLNODECORE aEntries[AVL_MAX_HEIGHT];
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| 47 | } AVLENUMDATA, *PAVLENUMDATA;
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| 48 |
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| 49 |
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| 50 | /*
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| 51 | * callback type
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| 52 | */
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| 53 | typedef unsigned ( _PAVLCALLBACK)(PAVLNODECORE, void*);
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| 54 | typedef _PAVLCALLBACK *PAVLCALLBACK;
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| 55 |
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| 56 |
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| 57 | void AVLInsert(PPAVLNODECORE ppTree, PAVLNODECORE pNode);
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| 58 | PAVLNODECORE AVLRemove(PPAVLNODECORE ppTree, AVLKEY Key);
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| 59 | PAVLNODECORE AVLGet(PPAVLNODECORE ppTree, AVLKEY Key);
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| 60 | PAVLNODECORE AVLGetWithParent(PPAVLNODECORE ppTree, PPAVLNODECORE ppParent, AVLKEY Key);
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| 61 | PAVLNODECORE AVLGetWithAdjecentNodes(PPAVLNODECORE ppTree, AVLKEY Key, PPAVLNODECORE ppLeft, PPAVLNODECORE ppRight);
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| 62 | unsigned AVLDoWithAll(PPAVLNODECORE ppTree, int fFromLeft, PAVLCALLBACK pfnCallBack, void *pvParam);
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| 63 | PAVLNODECORE AVLBeginEnumTree(PPAVLNODECORE ppTree, PAVLENUMDATA pEnumData, int fFromLeft);
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| 64 | PAVLNODECORE AVLGetNextNode(PAVLENUMDATA pEnumData);
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| 65 | PAVLNODECORE AVLGetBestFit(PPAVLNODECORE ppTree, AVLKEY Key, int fAbove);
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| 66 |
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| 67 |
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| 68 |
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| 69 | /*
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| 70 | * Just in case NULL is undefined.
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| 71 | */
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| 72 | #ifndef NULL
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| 73 | #define NULL ((void*)0)
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| 74 | #endif
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| 75 |
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| 76 | #ifdef __cplusplus
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| 77 | }
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| 78 | #endif
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| 79 |
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| 80 | #endif
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