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+/*
+ * Copyright (c) 2010 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Portions Copyright (c) 2010 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "baselocl.h"
+
+/*
+ *
+ */
+
+struct heim_array_data {
+ size_t len;
+ heim_object_t *val;
+ size_t allocated_len;
+ heim_object_t *allocated;
+};
+
+static void HEIM_CALLCONV
+array_dealloc(heim_object_t ptr)
+{
+ heim_array_t array = ptr;
+ size_t n;
+ for (n = 0; n < array->len; n++)
+ heim_release(array->val[n]);
+ free(array->allocated);
+}
+
+struct heim_type_data array_object = {
+ HEIM_TID_ARRAY,
+ "array-object",
+ NULL,
+ array_dealloc,
+ NULL,
+ NULL,
+ NULL,
+ NULL
+};
+
+/**
+ * Allocate an array
+ *
+ * @return A new allocated array, free with heim_release()
+ */
+
+heim_array_t
+heim_array_create(void)
+{
+ heim_array_t array;
+
+ array = _heim_alloc_object(&array_object, sizeof(*array));
+ if (array == NULL)
+ return NULL;
+
+ array->allocated = NULL;
+ array->allocated_len = 0;
+ array->val = NULL;
+ array->len = 0;
+
+ return array;
+}
+
+/**
+ * Get type id of an dict
+ *
+ * @return the type id
+ */
+
+heim_tid_t
+heim_array_get_type_id(void)
+{
+ return HEIM_TID_ARRAY;
+}
+
+/**
+ * Append object to array
+ *
+ * @param array array to add too
+ * @param object the object to add
+ *
+ * @return zero if added, errno otherwise
+ */
+
+int
+heim_array_append_value(heim_array_t array, heim_object_t object)
+{
+ heim_object_t *ptr;
+ size_t leading = array->val - array->allocated; /* unused leading slots */
+ size_t trailing = array->allocated_len - array->len - leading;
+ size_t new_len;
+
+ if (trailing > 0) {
+ /* We have pre-allocated space; use it */
+ array->val[array->len++] = heim_retain(object);
+ return 0;
+ }
+
+ if (leading > (array->len + 1)) {
+ /*
+ * We must have appending to, and deleting at index 0 from this
+ * array a lot; don't want to grow forever!
+ */
+ (void) memmove(&array->allocated[0], &array->val[0],
+ array->len * sizeof(array->val[0]));
+ array->val = array->allocated;
+
+ /* We have pre-allocated space; use it */
+ array->val[array->len++] = heim_retain(object);
+ return 0;
+ }
+
+ /* Pre-allocate extra .5 times number of used slots */
+ new_len = leading + array->len + 1 + (array->len >> 1);
+ ptr = realloc(array->allocated, new_len * sizeof(array->val[0]));
+ if (ptr == NULL)
+ return ENOMEM;
+ array->allocated = ptr;
+ array->allocated_len = new_len;
+ array->val = &ptr[leading];
+ array->val[array->len++] = heim_retain(object);
+
+ return 0;
+}
+
+/*
+ * Internal function to insert at index 0, taking care to optimize the
+ * case where we're always inserting at index 0, particularly the case
+ * where we insert at index 0 and delete from the right end.
+ */
+static int
+heim_array_prepend_value(heim_array_t array, heim_object_t object)
+{
+ heim_object_t *ptr;
+ size_t leading = array->val - array->allocated; /* unused leading slots */
+ size_t trailing = array->allocated_len - array->len - leading;
+ size_t new_len;
+
+ if (leading > 0) {
+ /* We have pre-allocated space; use it */
+ array->val--;
+ array->val[0] = heim_retain(object);
+ array->len++;
+ return 0;
+ }
+ if (trailing > (array->len + 1)) {
+ /*
+ * We must have prepending to, and deleting at index
+ * array->len - 1 from this array a lot; don't want to grow
+ * forever!
+ */
+ (void) memmove(&array->allocated[array->len], &array->val[0],
+ array->len * sizeof(array->val[0]));
+ array->val = &array->allocated[array->len];
+
+ /* We have pre-allocated space; use it */
+ array->val--;
+ array->val[0] = heim_retain(object);
+ array->len++;
+ return 0;
+ }
+ /* Pre-allocate extra .5 times number of used slots */
+ new_len = array->len + 1 + trailing + (array->len >> 1);
+ ptr = realloc(array->allocated, new_len * sizeof(array->val[0]));
+ if (ptr == NULL)
+ return ENOMEM;
+ (void) memmove(&ptr[1], &ptr[0], array->len * sizeof (array->val[0]));
+ array->allocated = ptr;
+ array->allocated_len = new_len;
+ array->val = &ptr[0];
+ array->val[0] = heim_retain(object);
+ array->len++;
+
+ return 0;
+}
+
+/**
+ * Insert an object at a given index in an array
+ *
+ * @param array array to add too
+ * @param idx index where to add element (-1 == append, -2 next to last, ...)
+ * @param object the object to add
+ *
+ * @return zero if added, errno otherwise
+ */
+
+int
+heim_array_insert_value(heim_array_t array, size_t idx, heim_object_t object)
+{
+ int ret;
+
+ if (idx == 0)
+ return heim_array_prepend_value(array, object);
+ else if (idx > array->len)
+ heim_abort("index too large");
+
+ /*
+ * We cheat: append this element then rotate elements around so we
+ * have this new element at the desired location, unless we're truly
+ * appending the new element. This means reusing array growth in
+ * heim_array_append_value() instead of duplicating that here.
+ */
+ ret = heim_array_append_value(array, object);
+ if (ret != 0 || idx == (array->len - 1))
+ return ret;
+ /*
+ * Shift to the right by one all the elements after idx, then set
+ * [idx] to the new object.
+ */
+ (void) memmove(&array->val[idx + 1], &array->val[idx],
+ (array->len - idx - 1) * sizeof(array->val[0]));
+ array->val[idx] = heim_retain(object);
+
+ return 0;
+}
+
+/**
+ * Iterate over all objects in array
+ *
+ * @param array array to iterate over
+ * @param ctx context passed to fn
+ * @param fn function to call on each object
+ */
+
+void
+heim_array_iterate_f(heim_array_t array, void *ctx, heim_array_iterator_f_t fn)
+{
+ size_t n;
+ int stop = 0;
+ for (n = 0; n < array->len; n++) {
+ fn(array->val[n], ctx, &stop);
+ if (stop)
+ return;
+ }
+}
+
+#ifdef __BLOCKS__
+/**
+ * Iterate over all objects in array
+ *
+ * @param array array to iterate over
+ * @param fn block to call on each object
+ */
+
+void
+heim_array_iterate(heim_array_t array, void (^fn)(heim_object_t, int *))
+{
+ size_t n;
+ int stop = 0;
+ for (n = 0; n < array->len; n++) {
+ fn(array->val[n], &stop);
+ if (stop)
+ return;
+ }
+}
+#endif
+
+/**
+ * Iterate over all objects in array, backwards
+ *
+ * @param array array to iterate over
+ * @param ctx context passed to fn
+ * @param fn function to call on each object
+ */
+
+void
+heim_array_iterate_reverse_f(heim_array_t array, void *ctx, heim_array_iterator_f_t fn)
+{
+ size_t n;
+ int stop = 0;
+
+ for (n = array->len; n > 0; n--) {
+ fn(array->val[n - 1], ctx, &stop);
+ if (stop)
+ return;
+ }
+}
+
+#ifdef __BLOCKS__
+/**
+ * Iterate over all objects in array, backwards
+ *
+ * @param array array to iterate over
+ * @param fn block to call on each object
+ */
+
+void
+heim_array_iterate_reverse(heim_array_t array, void (^fn)(heim_object_t, int *))
+{
+ size_t n;
+ int stop = 0;
+ for (n = array->len; n > 0; n--) {
+ fn(array->val[n - 1], &stop);
+ if (stop)
+ return;
+ }
+}
+#endif
+
+/**
+ * Get length of array
+ *
+ * @param array array to get length of
+ *
+ * @return length of array
+ */
+
+size_t
+heim_array_get_length(heim_array_t array)
+{
+ return array->len;
+}
+
+/**
+ * Get value of element at array index
+ *
+ * @param array array copy object from
+ * @param idx index of object, 0 based, must be smaller then
+ * heim_array_get_length()
+ *
+ * @return a not-retained copy of the object
+ */
+
+heim_object_t
+heim_array_get_value(heim_array_t array, size_t idx)
+{
+ if (idx >= array->len)
+ heim_abort("index too large");
+ return array->val[idx];
+}
+
+/**
+ * Get value of element at array index
+ *
+ * @param array array copy object from
+ * @param idx index of object, 0 based, must be smaller then
+ * heim_array_get_length()
+ *
+ * @return a retained copy of the object
+ */
+
+heim_object_t
+heim_array_copy_value(heim_array_t array, size_t idx)
+{
+ if (idx >= array->len)
+ heim_abort("index too large");
+ return heim_retain(array->val[idx]);
+}
+
+/**
+ * Set value at array index
+ *
+ * @param array array copy object from
+ * @param idx index of object, 0 based, must be smaller then
+ * heim_array_get_length()
+ * @param value value to set
+ *
+ */
+
+void
+heim_array_set_value(heim_array_t array, size_t idx, heim_object_t value)
+{
+ if (idx >= array->len)
+ heim_abort("index too large");
+ heim_release(array->val[idx]);
+ array->val[idx] = heim_retain(value);
+}
+
+/**
+ * Delete value at idx
+ *
+ * @param array the array to modify
+ * @param idx the key to delete
+ */
+
+void
+heim_array_delete_value(heim_array_t array, size_t idx)
+{
+ heim_object_t obj;
+ if (idx >= array->len)
+ heim_abort("index too large");
+ obj = array->val[idx];
+
+ array->len--;
+
+ /*
+ * Deleting the first or last elements is cheap, as we leave
+ * allocated space for opportunistic reuse later; no realloc(), no
+ * memmove(). All others require a memmove().
+ *
+ * If we ever need to optimize deletion of non-last/ non-first
+ * element we can use a tagged object type to signify "deleted
+ * value" so we can leave holes in the array, avoid memmove()s on
+ * delete, and opportunistically re-use those holes on insert.
+ */
+ if (idx == 0)
+ array->val++;
+ else if (idx < array->len)
+ (void) memmove(&array->val[idx], &array->val[idx + 1],
+ (array->len - idx) * sizeof(array->val[0]));
+
+ heim_release(obj);
+}
+
+/**
+ * Filter out entres of array when function return true
+ *
+ * @param array the array to modify
+ * @param fn filter function
+ */
+
+void
+heim_array_filter_f(heim_array_t array, void *ctx, heim_array_filter_f_t fn)
+{
+ size_t n = 0;
+
+ while (n < array->len) {
+ if (fn(array->val[n], ctx)) {
+ heim_array_delete_value(array, n);
+ } else {
+ n++;
+ }
+ }
+}
+
+#ifdef __BLOCKS__
+
+/**
+ * Filter out entres of array when block return true
+ *
+ * @param array the array to modify
+ * @param block filter block
+ */
+
+void
+heim_array_filter(heim_array_t array, int (^block)(heim_object_t))
+{
+ size_t n = 0;
+
+ while (n < array->len) {
+ if (block(array->val[n])) {
+ heim_array_delete_value(array, n);
+ } else {
+ n++;
+ }
+ }
+}
+
+#endif /* __BLOCKS__ */
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