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1 /*
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2 * File: Vector.h
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3 * Author: Me
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4 *
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5 * Created on May 14, 2010, 3:08 PM
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6 */
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7
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8 #ifndef _DYNARRAY_H
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9 #define _DYNARRAY_H
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10
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11 #include <PR__include/PR__primitive_data_types.h>
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12
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13
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14
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15 /*WARNING: Passing a DynArray as a param is dangerous if add to the DynArray
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16 * inside the function called! After adding or other operation that might
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17 * change the size, must re-read the addr of the chunk of memory that is the
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18 * array, via the DynArrayInfo.
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19 *Here's why: An array variable is a location, either on the stack
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20 * or in a field of a struct, whose contents is an addr. That addr is of the
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21 * first location of a chunk of locations. The DynArray works by changing
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22 * the chunk of locations, then modifying the contents of the original
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23 * array variable. It overwrites the addr of the old chunk of locations
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24 * with the addr of the new chunk.
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25 *But when the array variable is passed as a parameter, such as
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26 * in this: "foo( myDynArray )", then there are now two locations that hold
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27 * the addr of the same chunk of locations. So when a call is made that
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28 * adds to the DynArray, and inside the DynArray expands, it only updates
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29 * the original location with the new addr. Hence, the function will begin
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30 * overwriting memory past the end of the old chunk, because it still has
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31 * the pointer to the old chunk of locations.
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32 *
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33 *A dynamic array is accessed same as any other array. However, must use
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34 * dyn array calls, defined in here, in order to add or increase the size.
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35 * Must re-read the original array variable after any size-changing calls.
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36 *To pass a DynArray as a parameter to a function, can only pass the
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37 * DynArrayInfo, then inside the function, to read the addr of the first
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38 * location in the chunk of locations that is the array, do this:
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39 * "localArrayCopy = *(myDynArrayInfo->addrOfPtrToArray). After that, can
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40 * treat localArrayCopy as a normal array, as long as don't make any calls
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41 * that add or otherwise could increase the size of the array. If do make
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42 * such a call, then re-copy the array via the above. Can then use the
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43 * copy up until another add to the array.
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44 *
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45 */
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46 typedef struct
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47 {
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48 void ***addrOfPtrToArray; //addr of var that is array of ptrs == triple *
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49 int32 numInArray; //num entries added
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50 int32 sizeOfArray; //num elems alloc'd
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51 int32 sizeOfElem; //num bytes in one elem of array -- used in 2nd version
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52 }
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53 PrivDynArrayInfo;
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54
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55 PrivDynArrayInfo *
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56 makePrivDynArrayInfoFrom( void ***addrOfPtrToArray, int32 sizeOfArray );
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57
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58 PrivDynArrayInfo *
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59 makePrivDynArrayOfSize( void ***addrOfPtrToArray, int32 sizeOfArray );
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60
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61 PrivDynArrayInfo *
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62 makePrivDynArrayOfSize_Ext( void ***addrOfPtrToArray, int32 sizeOfArray );
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63
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64 int32
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65 addToDynArray( void *value, PrivDynArrayInfo *info );
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66
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67 void
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68 makeHighestDynArrayIndexBe( PrivDynArrayInfo *info, int32 highestIndex );
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69
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70 void
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71 makeHighestDynArrayIndexBeAtLeast(PrivDynArrayInfo *info,int32 highestIndex);
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72
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73 void
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74 increaseSizeOfDynArrayTo( PrivDynArrayInfo *info, int32 newSize );
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75
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76 typedef void (*FreeFnPtr) ( void * ); //fn has to cast void * to whatever
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77
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78 void
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79 freeDynArrayDeep( PrivDynArrayInfo *info, FreeFnPtr freeFnPtr );
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80
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81 void
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82 freeDynArrayFlat( PrivDynArrayInfo *info );
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83
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84
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85 typedef void (*DynArrayFnPtr) ( void * ); //fn has to cast void *
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86
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87 void
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88 forAllInDynArrayDo( PrivDynArrayInfo *info, DynArrayFnPtr fnPtr );
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89
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90 #endif /* _DYNARRAY_H */
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91
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