diff options
Diffstat (limited to 'libcutils/array.c')
-rw-r--r-- | libcutils/array.c | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/libcutils/array.c b/libcutils/array.c deleted file mode 100644 index 55ec055..0000000 --- a/libcutils/array.c +++ /dev/null @@ -1,170 +0,0 @@ -/* - * Copyright (C) 2007 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include <cutils/array.h> -#include <assert.h> -#include <stdlib.h> -#include <string.h> -#include <limits.h> - -#define INITIAL_CAPACITY (4) -#define MAX_CAPACITY ((int)(UINT_MAX/sizeof(void*))) - -struct Array { - void** contents; - int size; - int capacity; -}; - -Array* arrayCreate() { - return calloc(1, sizeof(struct Array)); -} - -void arrayFree(Array* array) { - assert(array != NULL); - - // Free internal array. - free(array->contents); - - // Free the Array itself. - free(array); -} - -/** Returns 0 if successful, < 0 otherwise.. */ -static int ensureCapacity(Array* array, int capacity) { - int oldCapacity = array->capacity; - if (capacity > oldCapacity) { - int newCapacity = (oldCapacity == 0) ? INITIAL_CAPACITY : oldCapacity; - - // Ensure we're not doing something nasty - if (capacity > MAX_CAPACITY) - return -1; - - // Keep doubling capacity until we surpass necessary capacity. - while (newCapacity < capacity) { - int newCap = newCapacity*2; - // Handle integer overflows - if (newCap < newCapacity || newCap > MAX_CAPACITY) { - newCap = MAX_CAPACITY; - } - newCapacity = newCap; - } - - // Should not happen, but better be safe than sorry - if (newCapacity < 0 || newCapacity > MAX_CAPACITY) - return -1; - - void** newContents; - if (array->contents == NULL) { - // Allocate new array. - newContents = malloc(newCapacity * sizeof(void*)); - if (newContents == NULL) { - return -1; - } - } else { - // Expand existing array. - newContents = realloc(array->contents, sizeof(void*) * newCapacity); - if (newContents == NULL) { - return -1; - } - } - - array->capacity = newCapacity; - array->contents = newContents; - } - - return 0; -} - -int arrayAdd(Array* array, void* pointer) { - assert(array != NULL); - int size = array->size; - int result = ensureCapacity(array, size + 1); - if (result < 0) { - return result; - } - array->contents[size] = pointer; - array->size++; - return 0; -} - -static inline void checkBounds(Array* array, int index) { - assert(array != NULL); - assert(index < array->size); - assert(index >= 0); -} - -void* arrayGet(Array* array, int index) { - checkBounds(array, index); - return array->contents[index]; -} - -void* arrayRemove(Array* array, int index) { - checkBounds(array, index); - - void* pointer = array->contents[index]; - - int newSize = array->size - 1; - - // Shift entries left. - if (index != newSize) { - memmove(array->contents + index, array->contents + index + 1, - (sizeof(void*)) * (newSize - index)); - } - - array->size = newSize; - - return pointer; -} - -void* arraySet(Array* array, int index, void* pointer) { - checkBounds(array, index); - void* old = array->contents[index]; - array->contents[index] = pointer; - return old; -} - -int arraySetSize(Array* array, int newSize) { - assert(array != NULL); - assert(newSize >= 0); - - int oldSize = array->size; - - if (newSize > oldSize) { - // Expand. - int result = ensureCapacity(array, newSize); - if (result < 0) { - return result; - } - - // Zero out new entries. - memset(array->contents + sizeof(void*) * oldSize, 0, - sizeof(void*) * (newSize - oldSize)); - } - - array->size = newSize; - - return 0; -} - -int arraySize(Array* array) { - assert(array != NULL); - return array->size; -} - -const void** arrayUnwrap(Array* array) { - return (const void**)array->contents; -} |