/*
 * utf.h
 *
 *  Created on: Dec 4, 2020
 *      Author: FICOM-IT LTD
 */

#ifndef SMS_INC_UTF_H_
#define SMS_INC_UTF_H_


#include <stddef.h>
#include <stdbool.h>
#include <sys/types.h>

typedef unsigned int UTF32;
typedef unsigned short UTF16;
typedef unsigned char UTF8;

#define UNI_REPLACEMENT_CHAR (UTF32)0x0000FFFD
#define UNI_MAX_BMP (UTF32)0x0000FFFF
#define UNI_MAX_UTF16 (UTF32)0x0010FFFF
#define UNI_MAX_UTF32 (UTF32)0x7FFFFFFF
#define UNI_MAX_LEGAL_UTF32 (UTF32)0x0010FFFF

typedef enum {
    conversionOK,        /* conversion successful */
    sourceExhausted,    /* partial character in source, but hit end */
    targetExhausted,    /* insuff. room in target for conversion */
    sourceIllegal       /* source sequence is illegal/malformed */
} ConversionResult;

typedef enum {
    strictConversion = 0,
    lenientConversion
} ConversionFlags;

/* This is for C++ and does no harm in C */
#ifdef __cplusplus
extern "C" {
#endif

ConversionResult ConvertUTF8toUTF16(
        const UTF8 **sourceStart, const UTF8 *sourceEnd,
        UTF16 **targetStart, UTF16 *targetEnd, ConversionFlags flags);

ConversionResult ConvertUTF16toUTF8(
        const UTF16 **sourceStart, const UTF16 *sourceEnd,
        UTF8 **targetStart, UTF8 *targetEnd, ConversionFlags flags);

ConversionResult ConvertUTF8toUTF32(
        const UTF8 **sourceStart, const UTF8 *sourceEnd,
        UTF32 **targetStart, UTF32 *targetEnd, ConversionFlags flags);

ConversionResult ConvertUTF32toUTF8(
        const UTF32 **sourceStart, const UTF32 *sourceEnd,
        UTF8 **targetStart, UTF8 *targetEnd, ConversionFlags flags);

ConversionResult ConvertUTF16toUTF32(
        const UTF16 **sourceStart, const UTF16 *sourceEnd,
        UTF32 **targetStart, UTF32 *targetEnd, ConversionFlags flags);

ConversionResult ConvertUTF32toUTF16(
        const UTF32 **sourceStart, const UTF32 *sourceEnd,
        UTF16 **targetStart, UTF16 *targetEnd, ConversionFlags flags);

bool isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd);

#ifdef __cplusplus
}
#endif

u_int32_t next_char(unsigned char **string);

const unsigned char *utf32toutf8(wchar_t *source, unsigned char *target, size_t size, int *len);

unsigned char *utf16toutf8(unsigned short *source, unsigned char *target, size_t size, int *len);

unsigned short *utf8toutf16(unsigned char *source, unsigned short *target, size_t size, int *len);

int utf8len(unsigned char *string);

int is_acsii(unsigned char *string);

size_t utf8_get_size(unsigned char *source, size_t num);

#endif /* SMS_INC_UTF_H_ */