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static bool needs_conversion(size_t arg_length, const charset_info_st* cs_from, const charset_info_st* cs_to);
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void set_or_copy_aligned(const char *s, size_t arg_length, const charset_info_st*);
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void copy(const char*s,size_t arg_length, const charset_info_st& csto);
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void append_with_prefill(const char *s, size_t arg_length, size_t full_length, char fill_char);
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int strstr(const String &search,size_t offset=0); // Returns offset to substring or -1
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int strrstr(const String &search,size_t offset=0); // Returns offset to substring or -1