102 lines
2.0 KiB
C++
102 lines
2.0 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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**********************************************************************
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* Copyright (C) 2002-2003, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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*/
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#include "layout/LETypes.h"
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#include "LXUtilities.h"
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U_NAMESPACE_BEGIN
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//
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// Finds the high bit by binary searching
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// through the bits in n.
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//
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le_int8 LXUtilities::highBit(le_int32 value)
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{
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if (value <= 0) {
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return -32;
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}
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le_int8 bit = 0;
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if (value >= 1 << 16) {
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value >>= 16;
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bit += 16;
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}
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if (value >= 1 << 8) {
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value >>= 8;
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bit += 8;
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}
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if (value >= 1 << 4) {
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value >>= 4;
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bit += 4;
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}
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if (value >= 1 << 2) {
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value >>= 2;
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bit += 2;
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}
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if (value >= 1 << 1) {
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value >>= 1;
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bit += 1;
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}
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return bit;
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}
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le_int32 LXUtilities::search(le_int32 value, const le_int32 array[], le_int32 count)
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{
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le_int32 power = 1 << highBit(count);
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le_int32 extra = count - power;
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le_int32 probe = power;
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le_int32 index = 0;
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if (value >= array[extra]) {
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index = extra;
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}
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while (probe > (1 << 0)) {
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probe >>= 1;
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if (value >= array[index + probe]) {
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index += probe;
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}
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}
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return index;
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}
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void LXUtilities::reverse(le_int32 array[], le_int32 length)
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{
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le_int32 front, back;
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for (front = 0, back = length - 1; front < back; front += 1, back -= 1) {
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le_int32 swap = array[front];
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array[front] = array[back];
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array[back] = swap;
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}
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}
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void LXUtilities::reverse(float array[], le_int32 length)
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{
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le_int32 front, back;
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for (front = 0, back = length - 1; front < back; front += 1, back -= 1) {
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float swap = array[front];
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array[front] = array[back];
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array[back] = swap;
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}
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}
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U_NAMESPACE_END
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