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array.c
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array.c
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#include <string.h>
#include <math.h>
#include "array.h"
#include "utils.h"
/* if it grows down, the InitialCount will be ignored. Otherwise, TheFirstAddress will be ignored. */
int Array_Init(__in Array *a, __in int DataLength, __in int InitialCount, __in BOOL GrowsDown, __in void *TheFirstAddress /* The first means the biggest address*/)
{
if( InitialCount < 0)
return 1;
a -> DataLength = DataLength;
a -> Used = 0;
if( GrowsDown == FALSE )
{
if( InitialCount > 0 )
{
a -> Data = SafeMalloc(DataLength * InitialCount);
if( a -> Data == NULL )
return 2;
memset(a -> Data, 0, DataLength * InitialCount);
} else {
a -> Data = NULL;
}
a -> Allocated = InitialCount;
} else {
a -> Allocated = -1;
a -> Data = TheFirstAddress;
}
return 0;
}
/* Subscript is always non-negative. */
void *Array_GetBySubscript(Array *a, int Subscript)
{
if( Subscript >= 0 && Subscript < a -> Used )
{
if( a -> Allocated < 0 )
{
Subscript *= (-1);
}
return (void *)((a -> Data) + (a -> DataLength) * Subscript);
} else {
return NULL;
}
}
/* Subscribe returned */
int Array_PushBack(Array *a, void *Data, void *Boundary /* Only used by grow down array */)
{
if( a -> Allocated >= 0 )
{
if( a -> Used == a -> Allocated )
{
int NewCount = (a -> Allocated) < 2 ? 2 : (a -> Allocated) + (a -> Allocated) / 2;
if( SafeRealloc((void **)&(a -> Data), NewCount * (a -> DataLength)) != 0 )
return -1;
a -> Allocated = NewCount;
}
if( Data != NULL )
memcpy((a -> Data) + (a -> DataLength) * (a -> Used), Data, a -> DataLength);
return (a -> Used)++;
} else {
if( Boundary != NULL && ((a -> Data) + (-1) * (a -> DataLength) * (a -> Used)) < (char *)Boundary )
{
return -1;
} else {
if( Data != NULL )
{
memcpy((a -> Data) + (-1) * (a -> DataLength) * (a -> Used), Data, a -> DataLength);
}
return (a -> Used)++;
}
}
}
void *Array_SetToSubscript(Array *a, int Subscript, void *Data)
{
if( a -> Allocated >= 0 )
{
if( Subscript >= a -> Allocated )
{
if( SafeRealloc((void **)&(a -> Data), (Subscript + 1) * (a -> DataLength)) != 0 )
return NULL;
a -> Allocated = Subscript + 1;
}
memcpy((a -> Data) + (a -> DataLength) * Subscript, Data, a -> DataLength);
if( a -> Used < Subscript + 1 )
a -> Used = Subscript + 1;
return (a -> Data) + (a -> DataLength) * Subscript;
} else {
memcpy((a -> Data) + (-1) * (a -> DataLength) * Subscript, Data, a -> DataLength);
return (a -> Data) + (-1) * (a -> DataLength) * Subscript;
}
}
void Array_Free(Array *a)
{
if( a -> Allocated >= 0 )
{
SafeFree(a -> Data);
a -> Data = NULL;
}
a -> Used = 0;
a -> Allocated = 0;
}