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lib/plist/bytearray.c

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+/*
+ * bytearray.c
+ * simple byte array implementation
+ *
+ * Copyright (c) 2011 Nikias Bassen, All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <string.h>
+#include "bytearray.h"
+
+#define PAGE_SIZE 4096
+
+bytearray_t *byte_array_new(size_t initial)
+{
+	bytearray_t *a = (bytearray_t*)malloc(sizeof(bytearray_t));
+	a->capacity = (initial > PAGE_SIZE) ? (initial+(PAGE_SIZE-1)) & (~(PAGE_SIZE-1)) : PAGE_SIZE;
+	a->data = malloc(a->capacity);
+	a->len = 0;
+	return a;
+}
+
+void byte_array_free(bytearray_t *ba)
+{
+	if (!ba) return;
+	if (ba->data) {
+		free(ba->data);
+	}
+	free(ba);
+}
+
+void byte_array_grow(bytearray_t *ba, size_t amount)
+{
+	size_t increase = (amount > PAGE_SIZE) ? (amount+(PAGE_SIZE-1)) & (~(PAGE_SIZE-1)) : PAGE_SIZE;
+	ba->data = realloc(ba->data, ba->capacity + increase);
+	ba->capacity += increase;
+}
+
+void byte_array_append(bytearray_t *ba, void *buf, size_t len)
+{
+	if (!ba || !ba->data || (len <= 0)) return;
+	size_t remaining = ba->capacity-ba->len;
+	if (len > remaining) {
+		size_t needed = len - remaining;
+		byte_array_grow(ba, needed);
+	}
+	memcpy(((char*)ba->data) + ba->len, buf, len);
+	ba->len += len;
+}