/* Copyright  (C) 2010-2020 The RetroArch team
 *
 * ---------------------------------------------------------------------------------------
 * The following license statement only applies to this file (utf.h).
 * ---------------------------------------------------------------------------------------
 *
 * Permission is hereby granted, free of charge,
 * to any person obtaining a copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef _LIBRETRO_ENCODINGS_UTF_H
#define _LIBRETRO_ENCODINGS_UTF_H

#include <stdint.h>
#include <stddef.h>

#include <boolean.h>

#include <retro_common_api.h>

RETRO_BEGIN_DECLS

enum CodePage
{
   CODEPAGE_LOCAL = 0, /* CP_ACP */
   CODEPAGE_UTF8  = 65001 /* CP_UTF8 */
};

/**
 * utf8_conv_utf32:
 *
 * Simple implementation. Assumes the sequence is
 * properly synchronized and terminated.
 **/
size_t utf8_conv_utf32(uint32_t *out, size_t out_chars,
      const char *in, size_t in_size);

/**
 * utf16_conv_utf8:
 *
 * Leaf function.
 **/
bool utf16_conv_utf8(uint8_t *out, size_t *out_chars,
      const uint16_t *in, size_t in_size);

/**
 * utf8len:
 *
 * Leaf function.
 **/
size_t utf8len(const char *string);

/**
 * utf8cpy:
 *
 * Acts mostly like strlcpy.
 *
 * Copies the given number of UTF-8 characters,
 * but at most @d_len bytes.
 *
 * Always NULL terminates. Does not copy half a character.
 * @s is assumed valid UTF-8.
 * Use only if @chars is considerably less than @d_len. 
 *
 * Hidden non-leaf function cost:
 * - Calls memcpy
 *
 * @return Number of bytes. 
 **/
size_t utf8cpy(char *d, size_t d_len, const char *s, size_t chars);

/**
 * utf8skip:
 *
 * Leaf function
 **/
const char *utf8skip(const char *str, size_t chars);

/** 
 * utf8_walk:
 *
 * Does not validate the input.
 *
 * Leaf function.
 *
 * @return Returns garbage if it's not UTF-8.
 **/
uint32_t utf8_walk(const char **string);

/**
 * utf16_to_char_string:
 **/
bool utf16_to_char_string(const uint16_t *in, char *s, size_t len);

/**
 * utf8_to_local_string_alloc:
 *
 * @return Returned pointer MUST be freed by the caller if non-NULL.
 **/
char *utf8_to_local_string_alloc(const char *str);

/**
 * local_to_utf8_string_alloc:
 *
 * @return Returned pointer MUST be freed by the caller if non-NULL.
 **/
char *local_to_utf8_string_alloc(const char *str);

/**
 * utf8_to_utf16_string_alloc:
 * 
 * @return Returned pointer MUST be freed by the caller if non-NULL.
 **/
wchar_t *utf8_to_utf16_string_alloc(const char *str);

/**
 * utf16_to_utf8_string_alloc:
 *
 * @return Returned pointer MUST be freed by the caller if non-NULL.
 **/
char *utf16_to_utf8_string_alloc(const wchar_t *str);

RETRO_END_DECLS

#endif