1 files changed, 58 insertions, 14 deletions

diff --git a/contrib/epee/include/storages/parserse_base_utils.h b/contrib/epee/include/storages/parserse_base_utils.h
index d73fbde3a..69b650cd4 100644
--- a/contrib/epee/include/storages/parserse_base_utils.h
+++ b/contrib/epee/include/storages/parserse_base_utils.h
@@ -29,6 +29,7 @@
 #pragma once 
 
 #include <algorithm>
+#include <boost/utility/string_ref.hpp>
 
 namespace epee 
 {
@@ -36,6 +37,40 @@ namespace misc_utils
 {
   namespace parse
   {
+    // 1: digit
+    // 2: .eE (floating point)
+    // 4: alpha
+    // 8: whitespace
+    // 16: allowed in float but doesn't necessarily mean it's a float
+    static const constexpr uint8_t lut[256]={
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 0, 0, // 16
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 32
+      8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0, 16, 18, 0, // 48
+      17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 0, 0, 0, 0, 0, 0, // 64
+      0, 4, 4, 4, 4, 22, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, // 80
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, // 96
+      0, 4, 4, 4, 4, 22, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, // 112
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, // 128
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    };
+
+    inline bool isspace(char c)
+    {
+      return lut[(uint8_t)c] & 8;
+    }
+
+    inline bool isdigit(char c)
+    {
+      return lut[(uint8_t)c] & 1;
+    }
+
     inline std::string transform_to_escape_sequence(const std::string& src)
     {
       static const char escaped[] = "\b\f\n\r\t\v\"\\/";
@@ -159,25 +194,34 @@ namespace misc_utils
           return false;
         }
       }
-      inline void match_number2(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, std::string& val, bool& is_float_val, bool& is_signed_val)
+      inline void match_number2(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, boost::string_ref& val, bool& is_float_val, bool& is_signed_val)
       {
         val.clear();
-        is_float_val = false;
-        for(std::string::const_iterator it = star_end_string;it != buf_end;it++)
+        uint8_t float_flag = 0;
+        is_signed_val = false;
+        size_t chars = 0;
+        std::string::const_iterator it = star_end_string;
+        if (it != buf_end && *it == '-')
+        {
+          is_signed_val = true;
+          ++chars;
+          ++it;
+        }
+        for(;it != buf_end;it++)
         {
-          if(isdigit(*it) || (it == star_end_string && *it == '-') || (val.size() && *it == '.' ) || (is_float_val && (*it == 'e' || *it == 'E' || *it == '-' || *it == '+' )) )
+          const uint8_t flags = lut[(uint8_t)*it];
+          if (flags & 16)
           {
-            if(!val.size() &&  *it == '-')
-              is_signed_val = true;
-            if(*it == '.' ) 
-              is_float_val = true;
-            val.push_back(*it);
+            float_flag |= flags;
+            ++chars;
           }
           else
           {
+            val = boost::string_ref(&*star_end_string, chars);
             if(val.size())
             {
               star_end_string = --it;
+              is_float_val = !!(float_flag & 2);
               return;
             }
             else 
@@ -186,7 +230,7 @@ namespace misc_utils
         }
         ASSERT_MES_AND_THROW("wrong number in json entry: " << std::string(star_end_string, buf_end));
       }
-      inline bool match_number(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, std::string& val)
+      inline bool match_number(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, boost::string_ref& val)
       {
         try
         {
@@ -199,15 +243,15 @@ namespace misc_utils
           return false;
         }
       }
-      inline void match_word2(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, std::string& val)
+      inline void match_word2(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, boost::string_ref& val)
       {
         val.clear();
 
         for(std::string::const_iterator it = star_end_string;it != buf_end;it++)
         {
-          if(!isalpha(*it))
+          if (!(lut[(uint8_t)*it] & 4))
           {
-            val.assign(star_end_string, it);
+            val = boost::string_ref(&*star_end_string, std::distance(star_end_string, it));
             if(val.size())
             {
               star_end_string = --it;
@@ -218,7 +262,7 @@ namespace misc_utils
         }
         ASSERT_MES_AND_THROW("failed to match word number in json entry: " << std::string(star_end_string, buf_end));
       }
-      inline bool match_word(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, std::string& val)
+      inline bool match_word(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, boost::string_ref& val)
       {
         try
         {