Add libiconv support

encoding.h

@@ -0,0 +1,36 @@
+#ifndef _UTILS_ENCODING_H
+#define _UTILS_ENCODING_H
+#include <string>
+#include "utils_config.h"
+namespace encoding {
+#if HAVE_ICONV
+    /**
+     * @brief Convert string from a encoding to another encoding
+     * @param input input string
+     * @param output output string
+     * @param ori_enc origin encoding
+     * @param des_enc target encoding
+     * @return true if sccessed.
+    */
+    bool iconv_convert(std::string input, std::string& output, std::string ori_enc, std::string des_enc);
+#endif
+#if _WIN32
+    /**
+     * @brief Convert encoding name to code page
+     * @param encoding Encoding name
+     * @param cp Code page
+     * @return
+    */
+    bool encodingToCp(std::string encoding, unsigned int& cp);
+#endif
+    /**
+     * @brief Convert string from a encoding to another encoding
+     * @param input input string
+     * @param output output string
+     * @param ori_enc origin encoding
+     * @param des_enc target encoding
+     * @return true if sccessed.
+    */
+    bool convert(std::string input, std::string& output, std::string ori_enc, std::string des_enc);
+}
+#endif