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/*
 * Open Chinese Convert
 *
 * Copyright 2010-2014 BYVoid <byvoid@byvoid.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __OPENCC_H_
#define __OPENCC_H_

#ifdef __cplusplus

#include <string>
#include "Export.hpp"
#include "SimpleConverter.hpp"

extern "C" {
#else
#include <stddef.h>
#endif

#ifndef OPENCC_EXPORT
#define OPENCC_EXPORT
#endif

/**
* @defgroup opencc_c_api OpenCC C API
*
* API in C language
*/

/**
* Filename of default Simplified to Traditional configuration
*
* @ingroup opencc_c_api
*/
#define OPENCC_DEFAULT_CONFIG_SIMP_TO_TRAD "s2t.json"

/**
* Filename of default Traditional to Simplified configuration
*
* @ingroup opencc_c_api
*/
#define OPENCC_DEFAULT_CONFIG_TRAD_TO_SIMP "t2s.json"

/**
* Type of opencc descriptor
*
* @ingroup opencc_c_api
*/
typedef void* opencc_t;

/**
* Makes an instance of opencc
*
* @param configFileName Location of configuration file. If this is set to NULL,
*                       OPENCC_DEFAULT_CONFIG_SIMP_TO_TRAD will be loaded.
* @return            A description pointer of the newly allocated instance of
*                    opencc. On error the return value will be (opencc_t) -1.
* @ingroup opencc_c_api
*/
OPENCC_EXPORT opencc_t opencc_open(const char* configFileName);
#ifdef _MSC_VER
/**
* Makes an instance of opencc (wide char / Unicode)
*
* @param configFileName Location of configuration file. If this is set to NULL,
*                       OPENCC_DEFAULT_CONFIG_SIMP_TO_TRAD will be loaded.
* @return            A description pointer of the newly allocated instance of
*                    opencc. On error the return value will be (opencc_t) -1.
* @ingroup opencc_c_api
*/
OPENCC_EXPORT opencc_t opencc_open_w(const wchar_t* configFileName);
#endif /* _MSC_VER */

/**
* Destroys an instance of opencc
*
* @param opencc The description pointer.
* @return 0 on success or non-zero number on failure.
* @ingroup opencc_c_api
*/
OPENCC_EXPORT int opencc_close(opencc_t opencc);

/**
* Converts UTF-8 string
*
* @param opencc The opencc description pointer.
* @param input  The UTF-8 encoded string.
* @param length The maximum length in byte to convert. If length is (size_t)-1,
*               the whole string (terminated by '\0') will be converted.
* @param output The buffer to store converted text. You MUST make sure this
*               buffer has sufficient space.
*
* @return       The length of converted string or (size_t)-1 on error.
*
* @ingroup opencc_c_api
*/
OPENCC_EXPORT size_t opencc_convert_utf8_to_buffer(opencc_t opencc,
                                                   const char* input,
                                                   size_t length,
                                                   char* output);

/**
* Converts UTF-8 string
* This function returns an allocated C-Style string, which stores
* the converted string.
* You MUST call opencc_convert_utf8_free() to release allocated memory.
*
* @param opencc The opencc description pointer.
* @param input  The UTF-8 encoded string.
* @param length The maximum length in byte to convert. If length is (size_t)-1,
*               the whole string (terminated by '\0') will be converted.
*
* @return       The newly allocated UTF-8 string that stores text converted,
*               or NULL on error.
* @ingroup opencc_c_api
*/
OPENCC_EXPORT char* opencc_convert_utf8(opencc_t opencc,
                                        const char* input,
                                        size_t length);

/**
* Releases allocated buffer by opencc_convert_utf8
*
* @param str    Pointer to the allocated string buffer by opencc_convert_utf8.
*
* @ingroup opencc_c_api
*/
OPENCC_EXPORT void opencc_convert_utf8_free(char* str);

/**
* Returns the last error message
*
* Note that this function is the only one which is NOT thread-safe.
*
* @ingroup opencc_c_api
*/
OPENCC_EXPORT const char* opencc_error(void);

#ifdef __cplusplus
} // extern "C"
#endif

/**
* @defgroup opencc_cpp_api OpenCC C++ Comprehensive API
*
* Comprehensive API in C++ language
*/

#endif