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516 lines
15 KiB
516 lines
15 KiB
/*++
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Copyright (c) Microsoft Corporation
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Module Name:
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array.c
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Abstract:
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This module contains some slightly higher level functions
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for dealing the arrays.
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Author:
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Jay Krell (JayKrell) April 2001
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Revision History:
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Environment:
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anywhere
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--*/
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#include "ntrtlp.h"
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//
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// the type of the comparison callback used by qsort and bsearch,
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// and optionally RtlMergeSortedArrays and RtlRemoveAdjacentEquivalentArrayElements
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//
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typedef
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int
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(__cdecl *
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RTL_QSORT_BSEARCH_COMPARISON_FUNCTION)(
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CONST VOID * Element1,
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CONST VOID * Element2
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);
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//
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// the type of the comparison callback usually used by
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// RtlMergeSortedArrays and RtlRemoveAdjacentEquivalentArrayElements
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//
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typedef
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RTL_GENERIC_COMPARE_RESULTS
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(NTAPI *
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RTL_COMPARE_ARRAY_ELEMENT_FUNCTION)(
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PVOID Context,
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IN CONST VOID * Element1,
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IN CONST VOID * Element2,
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IN SIZE_T ElementSize
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);
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//
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// the callback to RtlMergeSortedArrays and RtlRemoveAdjacentEquivalentArrayElements
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// to copy an elmement, if not via RtlCopyMemory
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//
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typedef
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VOID
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(NTAPI *
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RTL_COPY_ARRAY_ELEMENT_FUNCTION)(
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PVOID Context,
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PVOID To,
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CONST VOID * From,
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IN SIZE_T ElementSize
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);
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#define \
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RTL_MERGE_SORTED_ARRAYS_FLAG_COMPARE_IS_QSORT_BSEARCH_SIGNATURE \
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(0x00000001)
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// deliberately not NTSYSAPI, so it can be linked to statically w/o warning
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NTSTATUS
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NTAPI
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RtlMergeSortedArrays(
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IN ULONG Flags,
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IN CONST VOID * VoidArray1,
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IN SIZE_T Count1,
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IN CONST VOID * VoidArray2,
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IN SIZE_T Count2,
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// VoidResult == NULL is useful for getting the count first.
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OUT PVOID VoidResult OPTIONAL,
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OUT PSIZE_T OutResultCount,
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IN SIZE_T ElementSize,
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IN RTL_COMPARE_ARRAY_ELEMENT_FUNCTION CompareCallback,
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PVOID CompareContext OPTIONAL,
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IN RTL_COPY_ARRAY_ELEMENT_FUNCTION CopyCallback OPTIONAL,
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PVOID CopyContext OPTIONAL
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);
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#define \
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RTL_REMOVE_ADJACENT_EQUIVALENT_ARRAY_ELEMENTS_FLAG_COMPARE_IS_QSORT_BSEARCH_SIGNATURE \
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(0x00000001)
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// deliberately not NTSYSAPI, so it can be linked to statically w/o warning
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NTSTATUS
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NTAPI
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RtlRemoveAdjacentEquivalentArrayElements(
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IN ULONG Flags,
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IN OUT PVOID VoidArray,
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IN SIZE_T Count,
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OUT PSIZE_T OutCount,
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IN SIZE_T ElementSize,
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IN RTL_COMPARE_ARRAY_ELEMENT_FUNCTION CompareCallback,
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PVOID CompareContext OPTIONAL,
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IN RTL_COPY_ARRAY_ELEMENT_FUNCTION CopyCallback OPTIONAL,
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PVOID CopyContext OPTIONAL
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);
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typedef CONST VOID* PCVOID;
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RTL_GENERIC_COMPARE_RESULTS
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NTAPI
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RtlpQsortBsearchCompareAdapter(
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PVOID VoidContext,
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IN PCVOID VoidElement1,
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IN PCVOID VoidElement2,
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IN SIZE_T ElementSize
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)
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/*++
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Routine Description:
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This function is an "adapter" used so people can use comparison functions intended
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for use with qsort and bsearch with RtlMergeSortedArrays
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and RtlRemoveAdjacentEquivalentArrayElements.
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Arguments:
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VoidContext - the actual qsort/bsearch comparison callback function
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VoidElement1 - an elment to compare
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VoidElement2 - another elment to compare
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Return Value:
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GenericLessThan
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GenericGreaterThan
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GenericEqual
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--*/
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{
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CONST RTL_QSORT_BSEARCH_COMPARISON_FUNCTION QsortBsearchCompareCallback =
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(RTL_QSORT_BSEARCH_COMPARISON_FUNCTION)VoidContext;
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CONST int i = (*QsortBsearchCompareCallback)(VoidElement1, VoidElement2);
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return (i < 0) ? GenericLessThan : (i > 0) ? GenericGreaterThan : GenericEqual;
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}
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VOID
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NTAPI
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RtlpDoNothingCopyArrayElement(
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PVOID Context,
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OUT PVOID To,
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IN CONST VOID * From,
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IN SIZE_T ElementSize
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)
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/*++
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Routine Description:
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RtlMergeSortedArrays uses this for CopyCallback when ResultArray==NULL, which
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is useful for a two pass sequence that first determines
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the size of the result, then allocates it, then writes it.
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Arguments:
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Context - ignored
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To - ignored
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From - ignored
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Return Value:
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none
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--*/
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{
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UNREFERENCED_PARAMETER(Context);
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UNREFERENCED_PARAMETER(To);
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UNREFERENCED_PARAMETER(From);
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// do nothing, deliberately
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}
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NTSTATUS
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NTAPI
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RtlRemoveAdjacentEquivalentArrayElements( // aka "unique" (if sorted)
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IN ULONG Flags,
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IN OUT PVOID VoidArray,
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IN SIZE_T Count,
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OUT PSIZE_T OutCount,
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IN SIZE_T ElementSize,
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IN RTL_COMPARE_ARRAY_ELEMENT_FUNCTION CompareCallback,
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PVOID CompareContext OPTIONAL,
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IN RTL_COPY_ARRAY_ELEMENT_FUNCTION CopyCallback OPTIONAL, // defaults to RtlCopyMemory
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PVOID CopyContext OPTIONAL
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)
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/*++
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Routine Description:
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remove ajdacent equivalent elements from an array
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aka "unique", if the array is sorted
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Arguments:
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VoidArray - the start of a array
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Count - the number of elements in the array
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ElementSize - the sizes of the elements in the array, in bytes
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CompareCallback - a tristate comparison function in the style of qsort/bsearch
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Return Value:
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The return value is the number of elements contained
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in the resulting array.
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--*/
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{
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CONST PUCHAR Base = (PUCHAR)VoidArray;
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CONST PUCHAR End = (PUCHAR)(Base + Count * ElementSize);
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PUCHAR LastAccepted = Base;
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PUCHAR NextAccepted = (Base + ElementSize);
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PUCHAR Iterator = NextAccepted;
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NTSTATUS Status;
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if (OutCount == NULL) {
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Status = STATUS_INVALID_PARAMETER;
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goto Exit;
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}
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*OutCount = 0;
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if ((Flags & ~RTL_REMOVE_ADJACENT_EQUIVALENT_ARRAY_ELEMENTS_FLAG_COMPARE_IS_QSORT_BSEARCH_SIGNATURE) != 0) {
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Status = STATUS_INVALID_PARAMETER;
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goto Exit;
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}
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if ((Flags & RTL_REMOVE_ADJACENT_EQUIVALENT_ARRAY_ELEMENTS_FLAG_COMPARE_IS_QSORT_BSEARCH_SIGNATURE) != 0) {
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CompareCallback = (RTL_COMPARE_ARRAY_ELEMENT_FUNCTION)RtlpQsortBsearchCompareAdapter;
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CompareContext = (PVOID)CompareCallback;
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}
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if (Count < 2) {
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*OutCount = 1;
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Status = STATUS_SUCCESS;
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goto Exit;
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}
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Count = 1; // always take the first element
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for ( ; Iterator != End ; Iterator += ElementSize) {
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if ((*CompareCallback)(CompareContext, Iterator, LastAccepted, ElementSize) != 0) {
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if (Iterator != NextAccepted) {
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if (CopyCallback != NULL) {
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(*CopyCallback)(CopyContext, NextAccepted, Iterator, ElementSize);
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} else {
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RtlCopyMemory(NextAccepted, Iterator, ElementSize);
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}
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} else {
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// do not bother copying until we have skipped any elements
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}
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LastAccepted = NextAccepted;
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NextAccepted += ElementSize;
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Count += 1;
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}
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}
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*OutCount = Count;
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Status = STATUS_SUCCESS;
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Exit:
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return Status;
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}
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NTSTATUS
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NTAPI
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RtlMergeSortedArrays(
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IN ULONG Flags,
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IN PCVOID VoidArray1,
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IN SIZE_T Count1,
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IN PCVOID VoidArray2,
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IN SIZE_T Count2,
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OUT PVOID VoidResult OPTIONAL,
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OUT PSIZE_T OutResultCount,
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IN SIZE_T ElementSize,
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IN RTL_COMPARE_ARRAY_ELEMENT_FUNCTION CompareCallback,
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PVOID CompareContext OPTIONAL,
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IN RTL_COPY_ARRAY_ELEMENT_FUNCTION CopyCallback,
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PVOID CopyContext OPTIONAL
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)
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/*++
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Routine Description:
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Merge two sorted arrays into a third array.
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The third array must be preallocated to the size of the sum
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of the sizes of the two input arrays
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Arguments:
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VoidArray1 - the start of an array
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Count1 - the number of elements in the array that starts at VoidArray1
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VoidArray2 - the start of another array
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Count2 - the number of elements in the array that starts at VoidArray2
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VoidResult - the resulting array, must be capable of holding Count1+Count2 elements
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if this parameter is not supplied, no copying is done and the just the
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resulting required size is returned
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ElementSize - the sizes of the elements in all the arrays, in bytes
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CompareCallback - a tristate comparison function in the style of qsort/bsearch, plus it takes an additional parameter for context
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Return Value:
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The return value is the number of elements contained
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in the resulting array VoidResult.
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--*/
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{
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PUCHAR Array1 = (PUCHAR)VoidArray1;
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PUCHAR Array2 = (PUCHAR)VoidArray2;
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PUCHAR ResultArray = (PUCHAR)VoidResult;
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SIZE_T ResultCount = 0;
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NTSTATUS Status;
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if (OutResultCount == NULL) {
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Status = STATUS_INVALID_PARAMETER;
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goto Exit;
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}
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*OutResultCount = 0;
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if ((Flags & ~RTL_MERGE_SORTED_ARRAYS_FLAG_COMPARE_IS_QSORT_BSEARCH_SIGNATURE) != 0) {
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Status = STATUS_INVALID_PARAMETER;
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goto Exit;
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}
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//
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// This is useful to get back the resulting count, before allocating
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// the space.
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//
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if (VoidResult == NULL) {
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CopyCallback = RtlpDoNothingCopyArrayElement;
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}
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if ((Flags & RTL_MERGE_SORTED_ARRAYS_FLAG_COMPARE_IS_QSORT_BSEARCH_SIGNATURE) != 0) {
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CompareCallback = RtlpQsortBsearchCompareAdapter;
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CompareContext = (PVOID)CompareCallback;
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}
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for ( ; Count1 != 0 && Count2 != 0 ; ) {
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CONST int CompareResult = (*CompareCallback)(CompareContext, Array1, Array2, ElementSize);
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if (CompareResult < 0) {
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if (CopyCallback != NULL) {
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(*CopyCallback)(CopyContext, ResultArray, Array1, ElementSize);
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} else {
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RtlCopyMemory(ResultArray, Array1, ElementSize);
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}
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Array1 += ElementSize;
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Count1 -= 1;
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}
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else if (CompareResult > 0) {
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if (CopyCallback != NULL) {
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(*CopyCallback)(CopyContext, ResultArray, Array2, ElementSize);
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} else {
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RtlCopyMemory(ResultArray, Array2, ElementSize);
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}
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Array2 += ElementSize;
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Count2 -= 1;
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}
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else /* CompareResult == 0 */ {
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//
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// move past the elements in both arrays, chosing arbitrarily
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// which one to take (Array1)
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//
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if (CopyCallback != NULL) {
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(*CopyCallback)(CopyContext, ResultArray, Array1, ElementSize);
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} else {
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RtlCopyMemory(ResultArray, Array1, ElementSize);
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}
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Array1 += ElementSize;
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Array2 += ElementSize;
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Count1 -= 1;
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Count2 -= 1;
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}
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ResultCount += 1;
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ResultArray += ElementSize;
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}
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//
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// now pick up the tail of whichever one has any left, if either
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//
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if (VoidResult == NULL) {
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ResultCount += Count1 + Count2;
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} else if (Count1 != 0) {
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ResultCount += Count1;
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if (CopyCallback != NULL) {
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while (Count1 != 0) {
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//
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// perhaps CopyCallback should be copy_n instead of copy_1,
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// so we might gain an efficiency over the loop with an uninlinable
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// calback..
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//
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(*CopyCallback)(CopyContext, ResultArray, Array1, ElementSize);
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Count1 -= 1;
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ResultArray += ElementSize;
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Array1 += ElementSize;
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}
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} else {
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RtlCopyMemory(ResultArray, Array1, Count1 * ElementSize);
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ResultArray += Count1 * ElementSize;
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}
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} else if (Count2 != 0) {
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ResultCount += Count2;
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if (CopyCallback != NULL) {
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while (Count2 != 0) {
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//
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// perhaps CopyCallback should be copy_n instead of copy_1
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//
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(*CopyCallback)(CopyContext, ResultArray, Array2, ElementSize);
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Count2 -= 1;
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ResultArray += ElementSize;
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Array2 += ElementSize;
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}
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} else {
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RtlCopyMemory(ResultArray, Array2, Count2 * ElementSize);
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//optimize away ResultArray += Count2 * ElementSize;
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}
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}
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*OutResultCount = ResultCount;
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Status = STATUS_SUCCESS;
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Exit:
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return ResultCount;
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}
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#if 0 // test cases
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int __cdecl CompareULONG(PCVOID v1, PCVOID v2)
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{
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ULONG i1 = *(ULONG*)v1;
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ULONG i2 = *(ULONG*)v2;
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if (i1 > i2)
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return 1;
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if (i1 < i2)
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return -1;
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return 0;
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}
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void RtlpTestUnique(const char * s)
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{
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ULONG rg[64];
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ULONG i;
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ULONG len = strlen(s);
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for (i = 0 ; i != len ; ++i) rg[i] = s[i];
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len = RtlRemoveAdjacentEquivalentArrayElements(1, rg, len, sizeof(rg[0]), (PVOID)CompareULONG, NULL, NULL, NULL);
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printf("---");
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for (i = 0 ; i != len ; ++i) printf("%lu ", rg[i]);
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printf("---\n");
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}
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void RtlpTestMerge(const char * s, const char * t)
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{
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ULONG rg1[64];
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ULONG rg2[64];
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ULONG rg[128];
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ULONG i;
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ULONG slen = strlen(s);
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ULONG tlen = strlen(t);
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ULONG len;
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printf("merge(");
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for (i = 0 ; i != slen ; ++i) rg1[i] = s[i];
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for (i = 0 ; i != slen ; ++i) printf("%lu ", rg1[i]);
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printf(",");
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for (i = 0 ; i != tlen ; ++i) rg2[i] = t[i];
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for (i = 0 ; i != tlen ; ++i) printf("%lu ", rg2[i]);
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len = RtlMergeSortedArrays(1, rg1, slen, rg2, tlen, rg, sizeof(rg[0]), (PVOID)CompareULONG, NULL, NULL, NULL);
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printf(")=(---");
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for (i = 0 ; i != len ; ++i) printf("%lu ", rg[i]);
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printf(")\n");
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}
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int __cdecl main()
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{
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RtlpTestUnique("");
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RtlpTestUnique("\1");
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RtlpTestUnique("\1\2");
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RtlpTestUnique("\1\2\3");
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RtlpTestUnique("\1\1\2\3");
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RtlpTestUnique("\1\2\2\3");
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RtlpTestUnique("\1\2\3\3");
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RtlpTestUnique("\1\1\1\2\2\2\2\2\3");
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RtlpTestUnique("\1\1\1\2\3\3\3\3\3\3\3\3");
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RtlpTestUnique("\1\2\2\2\2\2\2\3\3\3\3\3\3\3\3");
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RtlpTestUnique("\1\1\1\1\1\2\2\2\2\2\3\3\3\3\3\3");
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RtlpTestUnique("\1\1\1\1\1\2\2\2\2\2\3\3\3\3\3\3\1");
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RtlpTestMerge("\1\2\3", "\4\5\6");
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RtlpTestMerge("\1\3\5", "\2\4\6");
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RtlpTestMerge("\1\2\3", "\2\4\6");
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RtlpTestMerge("\1\1\1\2\3", "\2\4\6\6\6");
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return 0;
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}
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#endif
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