Merge pull request #10844 from MednauN/master

Optimize memory allocations in VariantParser::get_token

1 files changed, 102 insertions, 0 deletions

diff --git a/core/string_buffer.cpp b/core/string_buffer.cpp
new file mode 100644
index 0000000000..195068f887
--- /dev/null
+++ b/core/string_buffer.cpp
@@ -0,0 +1,102 @@
+/*************************************************************************/
+/*  string_buffer.cpp                                                    */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+#include "string_buffer.h"
+
+#include <string.h>
+
+StringBuffer &StringBuffer::append(CharType p_char) {
+	reserve(string_length + 2);
+	current_buffer_ptr()[string_length++] = p_char;
+	return *this;
+}
+
+StringBuffer &StringBuffer::append(const String &p_string) {
+	return append(p_string.c_str());
+}
+
+StringBuffer &StringBuffer::append(const char *p_str) {
+	int len = strlen(p_str);
+	reserve(string_length + len + 1);
+
+	CharType *buf = current_buffer_ptr();
+	for (const char *c_ptr = p_str; c_ptr; ++c_ptr) {
+		buf[string_length++] = *c_ptr;
+	}
+	return *this;
+}
+
+StringBuffer &StringBuffer::append(const CharType *p_str, int p_clip_to_len) {
+	int len = 0;
+	while ((p_clip_to_len < 0 || len < p_clip_to_len) && p_str[len]) {
+		++len;
+	}
+	reserve(string_length + len + 1);
+	memcpy(&(current_buffer_ptr()[string_length]), p_str, len * sizeof(CharType));
+	string_length += len;
+
+	return *this;
+}
+
+StringBuffer &StringBuffer::reserve(int p_size) {
+	if (p_size < SHORT_BUFFER_SIZE || p_size < buffer.size())
+		return *this;
+
+	bool need_copy = string_length > 0 && buffer.empty();
+	buffer.resize(next_power_of_2(p_size));
+	if (need_copy) {
+		memcpy(buffer.ptr(), short_buffer, string_length * sizeof(CharType));
+	}
+
+	return *this;
+}
+
+int StringBuffer::length() const {
+	return string_length;
+}
+
+String StringBuffer::as_string() {
+	current_buffer_ptr()[string_length] = '\0';
+	if (buffer.empty()) {
+		return String(short_buffer);
+	} else {
+		buffer.resize(string_length + 1);
+		return buffer;
+	}
+}
+
+double StringBuffer::as_double() {
+	current_buffer_ptr()[string_length] = '\0';
+	return String::to_double(current_buffer_ptr());
+}
+
+int64_t StringBuffer::as_int() {
+	current_buffer_ptr()[string_length] = '\0';
+	return String::to_int(current_buffer_ptr());
+}