From 1c6ecd9c1a7a4306895621e4e5712759a5a44c1c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Hejl?= <hejl.lukas@gmail.com>
Date: Tue, 14 Sep 2021 11:09:23 +0200
Subject: [PATCH] Replaced atof and atoi inside 3MF attribute parsing with
 fast_float::from_chars and boost::spirit that are faster.

---
 src/libslic3r/Format/3mf.cpp | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/libslic3r/Format/3mf.cpp b/src/libslic3r/Format/3mf.cpp
index 295c1413d..043f951ef 100644
--- a/src/libslic3r/Format/3mf.cpp
+++ b/src/libslic3r/Format/3mf.cpp
@@ -21,6 +21,7 @@
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/filesystem/operations.hpp>
 #include <boost/spirit/include/karma.hpp>
+#include <boost/spirit/include/qi_int.hpp>
 #include <boost/log/trivial.hpp>
 
 #include <boost/property_tree/ptree.hpp>
@@ -32,6 +33,8 @@ namespace pt = boost::property_tree;
 #include <Eigen/Dense>
 #include "miniz_extension.hpp"
 
+#include <fast_float/fast_float.h>
+
 // Slightly faster than sprintf("%.9g"), but there is an issue with the karma floating point formatter,
 // https://github.com/boostorg/spirit/pull/586
 // where the exported string is one digit shorter than it should be to guarantee lossless round trip.
@@ -172,14 +175,18 @@ std::string get_attribute_value_string(const char** attributes, unsigned int att
 
 float get_attribute_value_float(const char** attributes, unsigned int attributes_size, const char* attribute_key)
 {
-    const char* text = get_attribute_value_charptr(attributes, attributes_size, attribute_key);
-    return (text != nullptr) ? (float)::atof(text) : 0.0f;
+    float value = 0.0f;
+    if (const char *text = get_attribute_value_charptr(attributes, attributes_size, attribute_key); text != nullptr)
+        fast_float::from_chars(text, text + strlen(text), value);
+    return value;
 }
 
 int get_attribute_value_int(const char** attributes, unsigned int attributes_size, const char* attribute_key)
 {
-    const char* text = get_attribute_value_charptr(attributes, attributes_size, attribute_key);
-    return (text != nullptr) ? ::atoi(text) : 0;
+    int value = 0;
+    if (const char *text = get_attribute_value_charptr(attributes, attributes_size, attribute_key); text != nullptr)
+        boost::spirit::qi::parse(text, text + strlen(text), boost::spirit::qi::int_, value);
+    return value;
 }
 
 bool get_attribute_value_bool(const char** attributes, unsigned int attributes_size, const char* attribute_key)