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#include 

#include 

#include 

typedef int conv_t;

typedef unsigned int ucs4_t;

typedef int iconv_t;

/* Return code if invalid input after a shift sequence of n bytes was read.

   (xxx_mbtowc) */

#define RET_SHIFT_ILSEQ(n)  (-1-2*(n))

/* Return code if invalid. (xxx_mbtowc) */

#define RET_ILSEQ           RET_SHIFT_ILSEQ(0)

/* Return code if only a shift sequence of n bytes was read. (xxx_mbtowc) */

#define RET_TOOFEW(n)       (-2-2*(n))

/* Return code if invalid. (xxx_wctomb) */

#define RET_ILUNI      -1

/* Return code if output buffer is too small. (xxx_wctomb, xxx_reset) */

#define RET_TOOSMALL   -2

#define CP866 0

#define CP1251 1

#define CP1252 2

#define KOI8_RU 3

#define ISO8859_5 4

#define UTF_8 5

#define KOI8_R 6

#define ISO8859_1 7

#include "cp866.h"

#include "cp1251.h"

#include "cp1252.h"

#include "koi8_r.h"

#include "koi8_ru.h"

#include "iso8859_1.h"

#include "iso8859_5.h"

#include "utf8.h"

int encoding(const char *someencoding) {

	char *what = strdup(someencoding);

	/* Ignore //TRANSLIT or //IGNORE for now. */

	int i;

	for(i = 0; i < strlen(what); i++) {

	  if(what[i] == '/') {

		what[i] = '\0';

		break;

	  }

	}

	if (!strcasecmp(what,"CP866")) return CP866;

	if (!strcasecmp(what,"CP1251")) return CP1251;

	if (!strcasecmp(what,"windows-1251")) return CP1251;

	if (!strcasecmp(what,"CP1252")) return CP1252;

	if (!strcasecmp(what,"windows-1252")) return CP1252;

	if (!strcasecmp(what,"KOI8-R")) return KOI8_R;

	if (!strcasecmp(what,"KOI8-RU")) return KOI8_RU;

	if (!strcasecmp(what,"ISO8859-1")) return ISO8859_1;

	if (!strcasecmp(what,"ISO8859-5")) return ISO8859_5;

	if (!strcasecmp(what,"UTF-8")) return UTF_8;

	return -1;

}

iconv_t iconv_open(const char *tocode, const char *fromcode) {

	int to, from;

	if ((to=encoding(tocode))==-1) return -1;

	if ((from=encoding(fromcode))==-1) return -1;

	to=to<<16&0xFFFF0000;

	from=from&0xFFFF;

	return to+from;

}

int iconv_close(iconv_t icd)

{

  return 0;

}

size_t iconv(iconv_t cd, const char **inbuf, size_t *inbytesleft,

	char **outbuf, size_t *outbytesleft)

{

	int n, to, from;

	size_t count1,count2;

	unsigned int pwc;

	int converted,written;

	int (*mbtowc)(conv_t, ucs4_t *, const unsigned char *, int);

	int (*wctomb)(conv_t, unsigned char *, ucs4_t, int);

	to=cd>>16;

	from=cd&0xFFFF;

	switch (from)

	{

		case CP866: mbtowc=cp866_mbtowc; break;

		case CP1251: mbtowc=cp1251_mbtowc; break;

		case CP1252: mbtowc=cp1252_mbtowc; break;

		case ISO8859_1: mbtowc=iso8859_1_mbtowc; break;

		case ISO8859_5: mbtowc=iso8859_5_mbtowc; break;

		case KOI8_R: mbtowc=koi8_r_mbtowc; break;

		case KOI8_RU: mbtowc=koi8_ru_mbtowc; break;

		case UTF_8: mbtowc=utf8_mbtowc; break;

		default: return (size_t)-1;

	}

	switch (to)

	{

		case CP866: wctomb=cp866_wctomb; break;

		case CP1251: wctomb=cp1251_wctomb; break;

		case CP1252: wctomb=cp1252_wctomb; break;

		case ISO8859_1: wctomb=iso8859_1_wctomb; break;

		case ISO8859_5: wctomb=iso8859_5_wctomb; break;

		case KOI8_R: wctomb=koi8_r_wctomb; break;

		case KOI8_RU: wctomb=koi8_ru_wctomb; break;

		case UTF_8: wctomb=utf8_wctomb; break;

		default: return (size_t)-1;

	}

	count1=0;

	count2=0;

    /* Convert input multibyte char to wide character by using calls to mbtowc */

    /* Convert wide character to multibyte by calls to wctomb */

    /* Handle errors as we go on converting to be as standard compliant as possible */

    while(count1 < *inbytesleft) {

      unsigned char mbholder[] = { 0,0,0,0,0,0 };

      int numbytes = (mbtowc)(0, &pwc,((*inbuf)+count1), *inbytesleft - count1);

      if(numbytes < 0) {

        /* errno = EILSEQ if invalid multibyte sequence encountered in input */

        /* errno = EINVAL if input ends in the middle of a multibyte sequence */

        switch(numbytes) {

          case RET_TOOFEW(0):

            errno = EINVAL;

            break;

          case RET_ILSEQ:

            errno = EILSEQ;

            break;

        }

        *inbytesleft -= count1;

        *outbytesleft -= count2;

        *inbuf += count1;

        *outbuf += count2;

        return (size_t) -1;

      }

      /* Convert from wide to multibyte storing result in mbholder and num converted in numbytes2 */

      /* Pass the minimum amount of space we have, one from mbholder and one from remaining in outbuf */

      int minspace = sizeof(mbholder) <= (*outbytesleft - count2) ? sizeof(mbholder) : (*outbytesleft - count2);

      int numbytes2 = (wctomb)(0, &mbholder[0], pwc, minspace);

      if(numbytes2 < 0) {

        switch(numbytes2) {

          case RET_ILUNI:

            errno = EILSEQ;

            break;

          case RET_TOOSMALL:

            errno = E2BIG;

            break;

        }

        *inbytesleft -= count1;

        *outbytesleft -= count2;

        *inbuf += count1;

        *outbuf += count2;

        return (size_t) -1;

      }

      int i;

      for(i = 0; i < numbytes2; i++) {

        *(*outbuf + count2 + i) = mbholder[i];

      }

      count1+=numbytes;

      count2+=numbytes2;

    }

    /* Successfully converted everything, update the variables and return number of bytes converted */

    *inbytesleft -= count1;

    *outbytesleft -= count2;

    *inbuf += count1;

    *outbuf += count2;

    return count1;

}

/* int main() */

/* { */

/* 	char *s;// ="вертолет"; */

/* 	char *z; */

/* 	//unsigned int pwc; */

/* 	iconv_t cd; */

/* 	size_t in, out; */

/*     FILE *infile; */

/*     char *fname = "file3.txt"; */

/*     size_t testmax = 100; */

/*     size_t test = 0; */

/*     infile = fopen(fname,"r"); */

/* 	fseek(infile, 0, SEEK_END); */

/* 	size_t file_size = ftell(infile); */

/* 	rewind(infile); */

/* 	char *buffer = (char*)malloc(file_size * sizeof(char)); */

/* 	if (buffer == NULL) */

/* 	{ */

/* 		fclose(infile); */

/* 		printf("Error allocating %d bytes.\n", file_size * sizeof(char)); */

/* 		return -1; */

/* 	} */

/* 	size_t bytes_read = fread(buffer, sizeof(char), file_size, infile); */

/* 	if (bytes_read != file_size) */

/* 	{ */

/* 		/\* printf("Have read only %d bytes of %d.\n", bytes_read, file_size); *\/ */

/* 		free(buffer); */

/* 		fclose(infile); */

/* 		return -1; */

/* 	} */

/* 	/\* in=strlen(buffer); *\/ */

/*     in = bytes_read; */

/* 	z=malloc(in+12000); */

/* 	out=in-1000; */

/* 	cd=iconv_open("UTF-8","UTF-8"); */

/* //	printf("%x\n",cd); */

/* 	int t; */

/*     char *zor = z; */

/*     /\* for(t = 0; t < 27400; t++) *\/ */

/*     /\*    printf("0x%x,", buffer[t]); *\/ */

/* 	t=iconv(cd, &buffer, &in, &z, &out); */

/* 	/\* printf("\nResult after iconv(): %d", t); *\/ */

/*     /\* for(t = 0; t < 24259; t++) *\/ */

/*     /\*   printf("%c", zor[t]); *\/ */

/*  	//for (;s

/* } */

/* typedef struct */

/* { */

/* 	char *name; */

/* 	void *f; */

/* } export_t; */

/* char szStart[]           = "START"; */

/* char szVersion[]         = "version"; */

/* char sziconv_open[]    = "iconv_open"; */

/* char sziconv[]   = "iconv"; */

/* export_t EXPORTS[] __asm__("EXPORTS") = */

/* { */

/* 	{ szStart,       (void*)0x0 }, */

/* 	{ szVersion,     (void*)0x00010001 }, */

/* 	{ sziconv_open,  iconv_open    }, */

/* 	{ sziconv,       iconv   }, */

/* 	{ NULL,          NULL }, */

/* }; */