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diff --git a/intl/icu/source/common/uvectr64.cpp b/intl/icu/source/common/uvectr64.cpp
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+* Copyright (C) 1999-2015, International Business Machines Corporation and
+* others. All Rights Reserved.
+******************************************************************************
+*/
+
+#include "uvectr64.h"
+#include "cmemory.h"
+#include "putilimp.h"
+
+U_NAMESPACE_BEGIN
+
+#define DEFAULT_CAPACITY 8
+
+/*
+ * Constants for hinting whether a key is an integer
+ * or a pointer. If a hint bit is zero, then the associated
+ * token is assumed to be an integer. This is needed for iSeries
+ */
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UVector64)
+
+UVector64::UVector64(UErrorCode &status) :
+ count(0),
+ capacity(0),
+ maxCapacity(0),
+ elements(nullptr)
+{
+ _init(DEFAULT_CAPACITY, status);
+}
+
+UVector64::UVector64(int32_t initialCapacity, UErrorCode &status) :
+ count(0),
+ capacity(0),
+ maxCapacity(0),
+ elements(0)
+{
+ _init(initialCapacity, status);
+}
+
+
+
+void UVector64::_init(int32_t initialCapacity, UErrorCode &status) {
+ // Fix bogus initialCapacity values; avoid malloc(0)
+ if (initialCapacity < 1) {
+ initialCapacity = DEFAULT_CAPACITY;
+ }
+ if (maxCapacity>0 && maxCapacity<initialCapacity) {
+ initialCapacity = maxCapacity;
+ }
+ if (initialCapacity > (int32_t)(INT32_MAX / sizeof(int64_t))) {
+ initialCapacity = uprv_min(DEFAULT_CAPACITY, maxCapacity);
+ }
+ elements = (int64_t *)uprv_malloc(sizeof(int64_t)*initialCapacity);
+ if (elements == 0) {
+ status = U_MEMORY_ALLOCATION_ERROR;
+ } else {
+ capacity = initialCapacity;
+ }
+}
+
+UVector64::~UVector64() {
+ uprv_free(elements);
+ elements = 0;
+}
+
+/**
+ * Assign this object to another (make this a copy of 'other').
+ */
+void UVector64::assign(const UVector64& other, UErrorCode &ec) {
+ if (ensureCapacity(other.count, ec)) {
+ setSize(other.count);
+ for (int32_t i=0; i<other.count; ++i) {
+ elements[i] = other.elements[i];
+ }
+ }
+}
+
+
+bool UVector64::operator==(const UVector64& other) {
+ int32_t i;
+ if (count != other.count) return false;
+ for (i=0; i<count; ++i) {
+ if (elements[i] != other.elements[i]) {
+ return false;
+ }
+ }
+ return true;
+}
+
+
+void UVector64::setElementAt(int64_t elem, int32_t index) {
+ if (0 <= index && index < count) {
+ elements[index] = elem;
+ }
+ /* else index out of range */
+}
+
+void UVector64::insertElementAt(int64_t elem, int32_t index, UErrorCode &status) {
+ // must have 0 <= index <= count
+ if (0 <= index && index <= count && ensureCapacity(count + 1, status)) {
+ for (int32_t i=count; i>index; --i) {
+ elements[i] = elements[i-1];
+ }
+ elements[index] = elem;
+ ++count;
+ }
+ /* else index out of range */
+}
+
+void UVector64::removeAllElements() {
+ count = 0;
+}
+
+UBool UVector64::expandCapacity(int32_t minimumCapacity, UErrorCode &status) {
+ if (U_FAILURE(status)) {
+ return false;
+ }
+ if (minimumCapacity < 0) {
+ status = U_ILLEGAL_ARGUMENT_ERROR;
+ return false;
+ }
+ if (capacity >= minimumCapacity) {
+ return true;
+ }
+ if (maxCapacity>0 && minimumCapacity>maxCapacity) {
+ status = U_BUFFER_OVERFLOW_ERROR;
+ return false;
+ }
+ if (capacity > (INT32_MAX - 1) / 2) { // integer overflow check
+ status = U_ILLEGAL_ARGUMENT_ERROR;
+ return false;
+ }
+ int32_t newCap = capacity * 2;
+ if (newCap < minimumCapacity) {
+ newCap = minimumCapacity;
+ }
+ if (maxCapacity > 0 && newCap > maxCapacity) {
+ newCap = maxCapacity;
+ }
+ if (newCap > (int32_t)(INT32_MAX / sizeof(int64_t))) { // integer overflow check
+ // We keep the original memory contents on bad minimumCapacity/maxCapacity.
+ status = U_ILLEGAL_ARGUMENT_ERROR;
+ return false;
+ }
+ int64_t* newElems = (int64_t *)uprv_realloc(elements, sizeof(int64_t)*newCap);
+ if (newElems == nullptr) {
+ // We keep the original contents on the memory failure on realloc.
+ status = U_MEMORY_ALLOCATION_ERROR;
+ return false;
+ }
+ elements = newElems;
+ capacity = newCap;
+ return true;
+}
+
+void UVector64::setMaxCapacity(int32_t limit) {
+ U_ASSERT(limit >= 0);
+ if (limit < 0) {
+ limit = 0;
+ }
+ if (limit > (int32_t)(INT32_MAX / sizeof(int64_t))) { // integer overflow check for realloc
+ // Something is very wrong, don't realloc, leave capacity and maxCapacity unchanged
+ return;
+ }
+ maxCapacity = limit;
+ if (capacity <= maxCapacity || maxCapacity == 0) {
+ // Current capacity is within the new limit.
+ return;
+ }
+
+ // New maximum capacity is smaller than the current size.
+ // Realloc the storage to the new, smaller size.
+ int64_t* newElems = (int64_t *)uprv_realloc(elements, sizeof(int64_t)*maxCapacity);
+ if (newElems == nullptr) {
+ // Realloc to smaller failed.
+ // Just keep what we had. No need to call it a failure.
+ return;
+ }
+ elements = newElems;
+ capacity = maxCapacity;
+ if (count > capacity) {
+ count = capacity;
+ }
+}
+
+/**
+ * Change the size of this vector as follows: If newSize is smaller,
+ * then truncate the array, possibly deleting held elements for i >=
+ * newSize. If newSize is larger, grow the array, filling in new
+ * slots with nullptr.
+ */
+void UVector64::setSize(int32_t newSize) {
+ int32_t i;
+ if (newSize < 0) {
+ return;
+ }
+ if (newSize > count) {
+ UErrorCode ec = U_ZERO_ERROR;
+ if (!ensureCapacity(newSize, ec)) {
+ return;
+ }
+ for (i=count; i<newSize; ++i) {
+ elements[i] = 0;
+ }
+ }
+ count = newSize;
+}
+
+U_NAMESPACE_END
+