fix: 修复utf8的校验和json返回类型

src/db.cc

@@ -123,9 +123,9 @@ int DB::Select(DWORD db_hanle, const char *sql,
           string content(it[i].content);
           item.push_back(content);
         } else {
-          string b64_str =
+          string base64_str =
               base64_encode((BYTE *)it[i].content, it[i].content_len);
-          item.push_back(b64_str);
+          item.push_back(base64_str);
         }
 
       } else {

src/http_handler.cc

@@ -588,7 +588,7 @@ void HttpHandler::HandlerRequest(struct mg_connection *c, void *ev_data) {
       ret = res.dump();
     }
     if (ret != "") {
-      mg_http_reply(c, 200, "", ret.c_str(), 0, 0);
+      mg_http_reply(c, 200, "Content-Type: application/json\r\n", "%s\n", ret.c_str());
     }
   } else {
     mg_http_reply(c, 500, NULL, "%s", "Invalid URI");

src/utils.cc

@@ -172,19 +172,43 @@ std::string Utils::WCharToUTF8(wchar_t *wstr) {
   return std::string();
 }
 
-bool Utils::IsTextUtf8(const char *str, int len) {
-  int needed = MultiByteToWideChar(CP_UTF8, 0, str, len, NULL, 0);
-  wchar_t *wide_str = new wchar_t[needed];
-  MultiByteToWideChar(CP_UTF8, 0, str, len, wide_str, needed);
+bool Utils::IsTextUtf8(const char *str,int length) {
+  char endian = 1;
+  bool littlen_endian = (*(char *)&endian == 1);
 
-  char *new_str = new char[len + 1];
-  WideCharToMultiByte(CP_ACP, 0, wide_str, -1, new_str, len + 1, NULL, NULL);
+  size_t i;
+  int bytes_num;
+  unsigned char chr;
 
-  bool isUtf8 = strcmp(str, new_str) == 0;
+  i = 0;
+  bytes_num = 0;
+  while (i < length) {
+    if (littlen_endian) {
+      chr = *(str + i);
+    } else {  // Big Endian
+      chr = (*(str + i) << 8) | *(str + i + 1);
+      i++;
+    }
 
-  delete[] wide_str;
-  delete[] new_str;
-
-  return isUtf8;
+    if (bytes_num == 0) {
+      if ((chr & 0x80) != 0) {
+        while ((chr & 0x80) != 0) {
+          chr <<= 1;
+          bytes_num++;
+        }
+        if ((bytes_num < 2) || (bytes_num > 6)) {
+          return false;
+        }
+        bytes_num--;
+      }
+    } else {
+      if ((chr & 0xC0) != 0x80) {
+        return false;
+      }
+      bytes_num--;
+    }
+    i++;
+  }
+  return (bytes_num == 0);
 }
 }  // namespace wxhelper

src/utils.h

@@ -47,7 +47,7 @@ class Utils {
 
   static std::string WCharToUTF8(wchar_t *wstr);
 
-  static bool IsTextUtf8(const char *str, int len);
+  static bool IsTextUtf8(const char * str,int length) ;
 
   template <typename T1, typename T2>
  static std::vector<T1> split(T1 str, T2 letter) {