/*
 ********************************************************************************
 *
 *   Copyright (C) 1998-1999, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 ********************************************************************************
 *
 *
 *  makeconv.c:
 *  tool creating a binary (compressed) representation of the conversion mapping
 *  table (IBM NLTC ucmap format).
 */
   
#include <stdio.h>
#include "ucmp16.h"
#include "ucmp8.h"
#include "ucnv_io.h"
#include "unicode/ucnv_bld.h"
#include "unicode/ucnv_err.h"
#include "ucnv_imp.h"
#include "cstring.h"
#include "cmemory.h"
#include "filestrm.h"
#include "toolutil.h"

#include "unicode/udata.h"
#include "unewdata.h"
#include "ucmpwrit.h"

/*Reads the header of the table file and fills in basic knowledge about the converter
 *in "converter"
 */
static void readHeaderFromFile(UConverter* myConverter, FileStream* convFile, const char* converterName, UErrorCode* err);

/*Reads the rest of the file, and fills up the shared objects if necessary*/
static void loadMBCSTableFromFile(FileStream* convFile, UConverter* converter, UErrorCode* err);

/*Reads the rest of the file, and fills up the shared objects if necessary*/
static void loadEBCDIC_STATEFULTableFromFile(FileStream* convFile, UConverter* converter, UErrorCode* err);

/*Reads the rest of the file, and fills up the shared objects if necessary*/
static void loadSBCSTableFromFile(FileStream* convFile, UConverter* converter, UErrorCode* err);

/*Reads the rest of the file, and fills up the shared objects if necessary*/
static void loadDBCSTableFromFile(FileStream* convFile, UConverter* converter, UErrorCode* err);

/* creates a UConverterSharedData from a mapping file, fills in necessary links to it the 
 * appropriate function pointers
 * if the data tables are already in memory
 */
static UConverterSharedData* createConverterFromTableFile(const char* realName, UErrorCode* err);


/*writes a CompactShortArray to a file*/
static void writeCompactShortArrayToFile(FileStream* outfile, const CompactShortArray* myArray);

/*writes a CompactByteArray to a file*/
static void writeCompactByteArrayToFile(FileStream* outfile, const CompactByteArray* myArray);

/*writes a binary to a file*/
static void writeUConverterSharedDataToFile(const char* filename, 
						  UConverterSharedData* mySharedData, 
						  UErrorCode* err);


static void WriteConverterSharedData(UNewDataMemory *pData, const UConverterSharedData* data);

static UConverterPlatform getPlatformFromName(char* name);
static int32_t getCodepageNumberFromName(char* name);


static const char NLTC_SEPARATORS[9] = { '\r', '\n', '\t', ' ', '<', '>' ,'"' , 'U', '\0' };
static const char PLAIN_SEPARATORS[9] = { '\r', '\n', '\t', ' ', '<', '>' ,'"' ,  '\0' };
static const char CODEPOINT_SEPARATORS[8] = {  '\r', '>', '\\', 'x', '\n', ' ', '\t', '\0' };
static const char UNICODE_CODEPOINT_SEPARATORS[6] = {  '<', '>', 'U', ' ', '\t', '\0' };

/* Remove all characters followed by '#'
 */
char *
  removeComments (char *line)
{
  char *pound = uprv_strchr (line, '#');

  if (pound != NULL)
    *pound = '\0';
  return line;
}

/*Returns uppercased string */
char *
  strtoupper (char *name)
{
  int32_t i = 0;

  while (name[i] = uprv_toupper (name[i]))
    i++;

  return name;
}

/* Returns true in c is a in set 'setOfChars', false otherwise
 */
bool_t 
  isInSet (char c, const char *setOfChars)
{
  uint8_t i = 0;

  while (setOfChars[i] != '\0')
    {
      if (c == setOfChars[i++])
	return TRUE;
    }

  return FALSE;
}

/* Returns pointer to the next non-whitespace (or non-separator)
 */
int32_t 
  nextTokenOffset (const char *line, const char *separators)
{
  int32_t i = 0;

  while (line[i] && isInSet (line[i], separators))
    i++;

  return i;
}

/* Returns pointer to the next token based on the set of separators
 */
char *
  getToken (char *token, char *line, const char *separators)
{
  int32_t i = nextTokenOffset (line, separators);
  int8_t j = 0;

  while (line[i] && (!isInSet (line[i], separators)))
    token[j++] = line[i++];
  token[j] = '\0';

  return line + i;
}

static const UDataInfo dataInfo={
    sizeof(UDataInfo),
    0,

    U_IS_BIG_ENDIAN,
    U_CHARSET_FAMILY,
    sizeof(UChar),
    0,

    0x63, 0x6e, 0x76, 0x74,     /* dataFormat="cnvt" */
    2, 0, 0, 0,                 /* formatVersion */
    1, 3, 1, 0                  /* dataVersion */
};


void writeConverterData(UConverterSharedData *mySharedData, const char *cName, UErrorCode *status)
{
  UNewDataMemory *mem;
  const char *cnvName, *cnvName2;

  uint32_t sz2;

  cnvName = uprv_strrchr(cName, '/');
  cnvName2 = uprv_strrchr(cName, '\\'); /* aliu - this is for Windows - what we
                                          really need is a platform-independent
                                          call to get the path separator */
  if (cnvName2 > cnvName) {
      cnvName = cnvName2; /* assume unix names don't contain '\\'! */
  }
  if(cnvName)
    {
      cnvName++;
    }
  else
    cnvName = cName;
  
  
  mem = udata_create("cnv", cnvName, &dataInfo, U_COPYRIGHT_STRING, status);
  
  WriteConverterSharedData(mem, mySharedData);

  sz2 = udata_finish(mem, status);
  
/*  printf("Done. Wrote %d bytes.\n", sz2); */
}


int main(int argc, char** argv)
{
  UConverterSharedData* mySharedData = NULL; 
  UErrorCode err = U_ZERO_ERROR;
  char outFileName[UCNV_MAX_FULL_FILE_NAME_LENGTH];
  char* dot = NULL, *arg;
  char cnvName[UCNV_MAX_FULL_FILE_NAME_LENGTH];
  
  if (argc == 1)
    {
      /*prints out a usage message*/
      printf("usage: %s file1 file2 file3 ...\n", argv[0]);
    }
  while (--argc)
    {
	  err = U_ZERO_ERROR;
      arg = getLongPathname(argv[argc]);

      /*removes the extension if any is found*/
      uprv_strcpy(outFileName, arg);
      if (dot = uprv_strchr(outFileName +   uprv_strlen(outFileName) - 4, '.')) 
	{
	  *dot = '\0';
	}
      /*Adds the target extension*/
      uprv_strcpy(cnvName, outFileName);
      
      uprv_strcat(outFileName, CONVERTER_FILE_EXTENSION);
      
      mySharedData = createConverterFromTableFile(arg, &err);

      if (U_FAILURE(err) || (mySharedData == NULL))
	{
	  /* in an error is found, print out a error msg and keep going*/
	  printf("Error creating \"%s\" file for \"%s\" (error code %d - %s)\n", outFileName, arg, err,
			u_errorName(err));
	  err = U_ZERO_ERROR;
	}
      else
	{
/*  	  writeUConverterSharedDataToFile(outFileName, mySharedData, &err); */
	  writeConverterData(mySharedData, cnvName, &err);
	  deleteSharedConverterData(mySharedData);

	  if(U_FAILURE(err))
	  {
		  /* in an error is found, print out a error msg and keep going*/
		  printf("Error writing \"%s\" file for \"%s\" (error code %d - %s)\n", outFileName, arg, err,
				u_errorName(err));
	  }
	  else
	  {
		  puts(outFileName);
	  }
	}
      
    }

  return err;
      
}


void copyPlatformString(char* platformString, UConverterPlatform pltfrm)
{
  switch (pltfrm)
    {
    case UCNV_IBM: {uprv_strcpy(platformString, "ibm");break;}
    default: {uprv_strcpy(platformString, "");break;}
    };
 
  return;
}

UConverterPlatform getPlatformFromName(char* name)
{
  char myPlatform[10];
  char mySeparators[2] = { '-', '\0' };
  
  getToken(myPlatform, name, mySeparators);
  strtoupper(myPlatform);

  if (uprv_strcmp(myPlatform, "IBM") == 0) return UCNV_IBM;
  else return UCNV_UNKNOWN;
}

int32_t getCodepageNumberFromName(char* name)
{
  char myNumber[10];
  char mySeparators[2] = { '-', '\0' };
  char* line = NULL;
 
  line = getToken(myNumber, name, mySeparators);
  getToken(myNumber, line, mySeparators);

  return T_CString_stringToInteger(myNumber, 10);
}

/*Reads the header of the table file and fills in basic knowledge about the converter in "converter"*/
void readHeaderFromFile(UConverter* myConverter,
			FileStream* convFile,
            const char* converterName,
			UErrorCode* err)
{
  char storeLine[UCNV_MAX_LINE_TEXT];
  char key[15];
  char value[30];
  char* line = storeLine;
  bool_t endOfHeader = FALSE;
  bool_t hasConvClass = FALSE;
  bool_t hasSubChar = FALSE;
  char codepointByte[3];

  if (U_FAILURE(*err)) return;
  while (!endOfHeader && T_FileStream_readLine(convFile, line, UCNV_MAX_LINE_TEXT)) 
    {
      removeComments(line);
      
      /*skip blank lines*/
      if (*(line + nextTokenOffset(line, NLTC_SEPARATORS)) != '\0') 
	{	  
	  /*gets the key that will qualify adjacent information*/
	  /*gets the adjacent value*/
	  line = getToken(key, line, NLTC_SEPARATORS);
	  if (uprv_strcmp(key, "uconv_class"))
	    line = getToken(value, line, NLTC_SEPARATORS);	      
	  else
	    line = getToken(value, line, PLAIN_SEPARATORS);	      

	  
	  /*
	     Figure out what key was found and fills in myConverter with the appropriate values
	     a switch statement for strings...
	     */
	  
	  /*Checks for end of header marker*/
	  if (uprv_strcmp(key, "CHARMAP") == 0) endOfHeader = TRUE;

	  /*get name tag*/
	  else if (uprv_strcmp(key, "code_set_name") == 0) 
	    {
          if (uprv_strlen(value) != 0) {
	        uprv_strcpy(myConverter->sharedData->name, value);
	        myConverter->sharedData->platform = getPlatformFromName(value);
	        myConverter->sharedData->codepage = getCodepageNumberFromName(value);
          } else {
            uprv_strcpy(myConverter->sharedData->name, converterName);
            myConverter->sharedData->platform = UCNV_IBM;
          }	      
	    }

	  /*get conversion type*/
	  else if (uprv_strcmp(key, "uconv_class") == 0)
	    {

	      hasConvClass = TRUE;
	      if (uprv_strcmp(value, "DBCS") == 0) 
		{
		  myConverter->sharedData->conversionType = UCNV_DBCS;
		}
	      else if (uprv_strcmp(value, "SBCS") == 0) 
		{
		  myConverter->sharedData->conversionType = UCNV_SBCS;
		}
	      else if (uprv_strcmp(value, "MBCS") == 0) 
		{
		  myConverter->sharedData->conversionType = UCNV_MBCS;
		}
	      else if (uprv_strcmp(value, "EBCDIC_STATEFUL") == 0) 
		{
		  myConverter->sharedData->conversionType = UCNV_EBCDIC_STATEFUL;
		}
	      else 
		{
		  *err = U_INVALID_TABLE_FORMAT;
		  return;
		}

	    }
	  
	  /*get mb_cur_max amount*/
	  else if (uprv_strcmp(key, "mb_cur_max") == 0) 
	    myConverter->sharedData->maxBytesPerChar = (int8_t)T_CString_stringToInteger(value, 10);
	  
	  /*get mb_cur_max amount*/
	  else if (uprv_strcmp(key, "mb_cur_min") == 0)
	    myConverter->sharedData->minBytesPerChar = (int8_t)T_CString_stringToInteger(value, 10);
	 
	  
	  else if (uprv_strcmp(key, "subchar") == 0) 
	    {
	      hasSubChar = TRUE;
	      myConverter->sharedData->defaultConverterValues.subCharLen = 0;
	      
	      /*readies value for tokenizing, we want to break each byte of the codepoint into single tokens*/
	      line = value;
	      while (*line)
		{
		  line = getToken(codepointByte, line, CODEPOINT_SEPARATORS);
		  myConverter->sharedData->defaultConverterValues.subChar[(myConverter->sharedData->defaultConverterValues.subCharLen++)] =
		    (unsigned char)T_CString_stringToInteger(codepointByte, 16);
		}
	      
	      /*Initializes data from the mutable area to that found in the immutable area*/
	      
	    }	  
	}
      /*make line point to the beginning of the storage buffer again*/
      line = storeLine;
    }

  if (!hasSubChar)   {myConverter->subCharLen = myConverter->sharedData->defaultConverterValues.subCharLen = 0;}
  else 
    {
      myConverter->subCharLen = myConverter->sharedData->defaultConverterValues.subCharLen;
      uprv_memcpy(myConverter->subChar,
		 myConverter->sharedData->defaultConverterValues.subChar, 
		 myConverter->subCharLen);
    }
  
  
  if (!endOfHeader || !hasConvClass)     *err = U_INVALID_TABLE_FORMAT;
  return;
}
  
  
void loadSBCSTableFromFile(FileStream* convFile, UConverter* myConverter, UErrorCode* err)
{
  char storageLine[UCNV_MAX_LINE_TEXT];
  char* line = NULL;
  UConverterTable* myUConverterTable = NULL;
  UChar unicodeValue = 0xFFFF;
  int32_t sbcsCodepageValue = 0;
  char codepointBytes[5];
  unsigned char replacementChar = '\0';
  int32_t i = 0;
  CompactByteArray* myFromUnicode = NULL;

  
  if (U_FAILURE(*err)) return;
  replacementChar = myConverter->subChar[0];
  myUConverterTable = (UConverterTable*)uprv_malloc(sizeof(UConverterSBCSTable));
  if (myUConverterTable == NULL) 
    {
      *err = U_MEMORY_ALLOCATION_ERROR;
      return;
    }

  /*create a compact array with replacement chars as default chars*/
  myFromUnicode = ucmp8_open(0);  
  if (myFromUnicode == NULL) 
    {
      uprv_free(myUConverterTable);
      *err = U_MEMORY_ALLOCATION_ERROR;
      return;
    } 
  
  myUConverterTable->sbcs.toUnicode = (UChar*)malloc(sizeof(UChar)*256);
  /*fills in the toUnicode array with the Unicode Replacement Char*/
  for (i=0;i<255;i++) myUConverterTable->sbcs.toUnicode[i] = unicodeValue;

  
  while (T_FileStream_readLine(convFile, storageLine, UCNV_MAX_LINE_TEXT))
    {
      /*removes comments*/
      removeComments(storageLine);

      /*set alias pointer back to the beginning of the buffer*/
      line = storageLine;
      
      /*skips empty lines*/
      if (line[nextTokenOffset(line, NLTC_SEPARATORS)] != '\0')
	{
	  line = getToken(codepointBytes, line, UNICODE_CODEPOINT_SEPARATORS);
	  if (!uprv_strcmp(codepointBytes, "END")) break;
	  unicodeValue = (UChar)T_CString_stringToInteger(codepointBytes, 16);
	  line = getToken(codepointBytes, line, CODEPOINT_SEPARATORS);
	  sbcsCodepageValue = T_CString_stringToInteger(codepointBytes, 16);
	  /*Store in the toUnicode array*/
	  myUConverterTable->sbcs.toUnicode[sbcsCodepageValue] = unicodeValue;
	  /*Store in the fromUnicode compact array*/
	  ucmp8_set(myFromUnicode, unicodeValue, (int8_t)sbcsCodepageValue);
	}
    }
  ucmp8_compact(myFromUnicode, 1);
  myUConverterTable->sbcs.fromUnicode = myFromUnicode;
  /*Initially sets the referenceCounter to 1*/
  myConverter->sharedData->referenceCounter = 1;
  myConverter->sharedData->table = myUConverterTable;
  
  return;
}

void loadMBCSTableFromFile(FileStream* convFile, UConverter* myConverter, UErrorCode* err)
{
  char storageLine[UCNV_MAX_LINE_TEXT];
  char* line = NULL;
  UConverterTable* myUConverterTable = NULL;
  UChar unicodeValue = 0xFFFF;
  int32_t mbcsCodepageValue = '\0';
  char codepointBytes[6];
  int32_t replacementChar = 0x0000;
  uint16_t i = 0;
  CompactShortArray* myFromUnicode = NULL;
  CompactShortArray* myToUnicode = NULL;

  /*Evaluates the replacement codepoint*/
  replacementChar = 0xFFFF;

  myUConverterTable = (UConverterTable*)uprv_malloc(sizeof(UConverterMBCSTable));
  if (myUConverterTable == NULL) 
    {
      *err = U_MEMORY_ALLOCATION_ERROR;
      return;
    }
  
  myUConverterTable->mbcs.starters = (bool_t*)(uprv_malloc(sizeof(bool_t)*256));
  if (myUConverterTable->mbcs.starters == NULL) 
    {
      *err = U_MEMORY_ALLOCATION_ERROR;
      return;
    }
  

  /*Initializes the mbcs.starters to FALSE*/

  for (i=0; i<=255; i++) 
    {
      myUConverterTable->mbcs.starters[i] = FALSE;
    } 

  myFromUnicode = ucmp16_open((uint16_t)replacementChar);
  myToUnicode = ucmp16_open((int16_t)0xFFFD);  
  
  while (T_FileStream_readLine(convFile, storageLine, UCNV_MAX_LINE_TEXT))
    {
      removeComments(storageLine);
      line = storageLine;
      if (line[nextTokenOffset(line, NLTC_SEPARATORS)] != '\0')
	{
	  line = getToken(codepointBytes, line, UNICODE_CODEPOINT_SEPARATORS);
	  if (!uprv_strcmp(codepointBytes, "END")) break;
	  unicodeValue = (UChar)T_CString_stringToInteger(codepointBytes, 16);
	  line = getToken(codepointBytes, line, CODEPOINT_SEPARATORS);
	  if (line[nextTokenOffset(line, CODEPOINT_SEPARATORS)] != '\0') 
	    {
	      /*When there is a second byte*/
	      myUConverterTable->mbcs.starters[T_CString_stringToInteger(codepointBytes, 16)] = TRUE;
	      line = getToken(codepointBytes+2, line, CODEPOINT_SEPARATORS);
	    }

	  mbcsCodepageValue = T_CString_stringToInteger(codepointBytes, 16);
	  
	  ucmp16_set(myToUnicode, (int16_t)mbcsCodepageValue, unicodeValue);
	  ucmp16_set(myFromUnicode, unicodeValue, (int16_t)mbcsCodepageValue);
	}
    }

  ucmp16_compact(myFromUnicode);
  ucmp16_compact(myToUnicode);
  myUConverterTable->mbcs.fromUnicode = myFromUnicode;
  myUConverterTable->mbcs.toUnicode = myToUnicode;
  myConverter->sharedData->referenceCounter = 1;
  myConverter->sharedData->table = myUConverterTable;

  /* if the default subCharLen is > 1 we need to insert it in the data structure
     so that we know how to transition */
  if (myConverter->subCharLen > 1)
    {
      myConverter->sharedData->table->mbcs.starters[(uint8_t)(myConverter->subChar[0])] = TRUE;
    }
  return;
}

void loadEBCDIC_STATEFULTableFromFile(FileStream* convFile, UConverter* myConverter, UErrorCode* err)
{
  char storageLine[UCNV_MAX_LINE_TEXT];
  char* line = NULL;
  UConverterTable* myUConverterTable = NULL;
  UChar unicodeValue = 0xFFFF;
  int32_t mbcsCodepageValue = '\0';
  char codepointBytes[6];
  int32_t replacementChar = 0x0000;
  uint8_t i = 0;
  CompactShortArray* myFromUnicode = NULL;
  CompactShortArray* myToUnicode = NULL;

  /*Evaluates the replacement codepoint*/
  replacementChar = 0xFFFF;

  myUConverterTable = (UConverterTable*)uprv_malloc(sizeof(UConverterMBCSTable));
  if (myUConverterTable == NULL) 
    {
      *err = U_MEMORY_ALLOCATION_ERROR;
      return;
    }
  
  
  myFromUnicode = ucmp16_open((uint16_t)replacementChar);
  myToUnicode = ucmp16_open((int16_t)0xFFFD);  
  
  while (T_FileStream_readLine(convFile, storageLine, UCNV_MAX_LINE_TEXT))
    {
      removeComments(storageLine);
      line = storageLine;
      if (line[nextTokenOffset(line, NLTC_SEPARATORS)] != '\0')
	{
	  line = getToken(codepointBytes, line, UNICODE_CODEPOINT_SEPARATORS);
	  if (!uprv_strcmp(codepointBytes, "END")) break;
	  unicodeValue = (UChar)T_CString_stringToInteger(codepointBytes, 16);
	  line = getToken(codepointBytes, line, CODEPOINT_SEPARATORS);
	  if (line[nextTokenOffset(line, CODEPOINT_SEPARATORS)] != '\0') 
	    {
	      /*two-byter!*/
	      line = getToken(codepointBytes+2, line, CODEPOINT_SEPARATORS);
	    }
	  
	  mbcsCodepageValue = T_CString_stringToInteger(codepointBytes, 16);
	  
	  ucmp16_set(myToUnicode, (int16_t)mbcsCodepageValue, unicodeValue);
	  ucmp16_set(myFromUnicode, unicodeValue, (int16_t)mbcsCodepageValue);
	}
    }

  ucmp16_compact(myFromUnicode);
  ucmp16_compact(myToUnicode);
  myUConverterTable->dbcs.fromUnicode = myFromUnicode;
  myUConverterTable->dbcs.toUnicode = myToUnicode;
  myConverter->sharedData->referenceCounter = 1;
  myConverter->sharedData->table = myUConverterTable;

  return;
}


void loadDBCSTableFromFile(FileStream* convFile, UConverter* myConverter, UErrorCode* err)
{
  char storageLine[UCNV_MAX_LINE_TEXT];
  char* line = NULL;
  UConverterTable* myUConverterTable = NULL;
  UChar unicodeValue = 0xFFFD;
  int32_t dbcsCodepageValue = '\0';
  char codepointBytes[6];
  int32_t replacementChar = 0x0000;
  uint8_t i = 0;
  CompactShortArray* myFromUnicode = NULL;
  CompactShortArray* myToUnicode = NULL;
  
  /*Evaluates the replacement codepoint*/
  replacementChar = 0xFFFF;

  myUConverterTable = (UConverterTable*)uprv_malloc(sizeof(UConverterDBCSTable));
  if (myUConverterTable == NULL) 
    {
      *err = U_MEMORY_ALLOCATION_ERROR;
      return;
    }
  
  myFromUnicode = ucmp16_open((int16_t)replacementChar);
  myToUnicode = ucmp16_open((int16_t)0xFFFD);  
  
  while (T_FileStream_readLine(convFile, storageLine, UCNV_MAX_LINE_TEXT))
    {
      removeComments(storageLine);
      line = storageLine;
      if (line[nextTokenOffset(line, NLTC_SEPARATORS)] != '\0')
	{
	  line = getToken(codepointBytes, line, UNICODE_CODEPOINT_SEPARATORS);
	  if (!uprv_strcmp(codepointBytes, "END")) break;
	  unicodeValue = (UChar)T_CString_stringToInteger(codepointBytes, 16);
	  
	  /*first byte*/
	  line = getToken(codepointBytes, line, CODEPOINT_SEPARATORS);
	  
	  /*second byte*/
	  line = getToken(codepointBytes+2, line, CODEPOINT_SEPARATORS);
	}
      
      dbcsCodepageValue = T_CString_stringToInteger(codepointBytes, 16);
      ucmp16_set(myToUnicode, (int16_t)dbcsCodepageValue, unicodeValue);
      ucmp16_set(myFromUnicode, unicodeValue, (int16_t)dbcsCodepageValue);
    }
  
  ucmp16_compact(myFromUnicode);
  ucmp16_compact(myToUnicode);
  myUConverterTable->dbcs.fromUnicode = myFromUnicode;
  myUConverterTable->dbcs.toUnicode = myToUnicode;


  myConverter->sharedData->referenceCounter = 1;
  myConverter->sharedData->table = myUConverterTable;
  
  return;
}

/*deletes the "shared" type object*/
bool_t deleteSharedConverterData(UConverterSharedData* deadSharedData)
{
  if (deadSharedData->conversionType == UCNV_SBCS)
    {
      ucmp8_close(deadSharedData->table->sbcs.fromUnicode);
      uprv_free(deadSharedData->table);
      uprv_free(deadSharedData);
    }
  else if (deadSharedData->conversionType == UCNV_MBCS)
    {
      ucmp16_close(deadSharedData->table->mbcs.fromUnicode);
      ucmp16_close(deadSharedData->table->mbcs.toUnicode);
      uprv_free(deadSharedData->table);
      uprv_free(deadSharedData);
    }
  else if ((deadSharedData->conversionType == UCNV_DBCS) || (deadSharedData->conversionType == UCNV_EBCDIC_STATEFUL))
    {
      ucmp16_close(deadSharedData->table->dbcs.fromUnicode);
      ucmp16_close(deadSharedData->table->dbcs.toUnicode);
      uprv_free(deadSharedData->table);
      uprv_free(deadSharedData);
    }
  else
    {
      uprv_free(deadSharedData);
    }
  return TRUE;
}


/*creates a UConverter, fills in necessary links to it the appropriate function pointers*/
UConverterSharedData* createConverterFromTableFile(const char* converterName, UErrorCode* err)
{
  FileStream* convFile = NULL;
  int32_t i = 0;
  UConverterSharedData* mySharedData = NULL;
  UConverter myConverter;


  if (U_FAILURE(*err)) return NULL;
  
  convFile = T_FileStream_open(converterName, "r");
  if (convFile == NULL) 
    {
      *err = U_FILE_ACCESS_ERROR;
      return NULL;
    }
  
  
  mySharedData = (UConverterSharedData*) uprv_malloc(sizeof(UConverterSharedData));
  if (mySharedData == NULL)
    {
      *err = U_MEMORY_ALLOCATION_ERROR;
      T_FileStream_close(convFile);
    }
  
  mySharedData->structSize = sizeof(UConverterSharedData);
  mySharedData->dataMemory = NULL; /* for init */

  myConverter.sharedData = mySharedData;
  readHeaderFromFile(&myConverter, convFile, converterName, err);

  if (U_FAILURE(*err)) return NULL;
  
  switch (mySharedData->conversionType)
    {
    case UCNV_SBCS: 
      {
  	loadSBCSTableFromFile(convFile, &myConverter, err);
	break;
      }
    case UCNV_MBCS: 
      {
	loadMBCSTableFromFile(convFile, &myConverter, err);
	break;
      }
    case UCNV_EBCDIC_STATEFUL: 
      {
	loadEBCDIC_STATEFULTableFromFile(convFile, &myConverter, err);
	break;
      }
    case UCNV_DBCS: 
      {
	loadDBCSTableFromFile(convFile, &myConverter, err);
	break;
      }

    default : break;
    };

  T_FileStream_close(convFile);

  
  return mySharedData;
}


static void WriteConverterSharedData(UNewDataMemory *pData, const UConverterSharedData* data)
{
    uint32_t size = 0;
    
    udata_writeBlock(pData, data, sizeof(UConverterSharedData));

    size += sizeof(UConverterSharedData); /* Is 4-aligned- it ends with a pointer */

    switch (data->conversionType)
    {
    case UCNV_SBCS:
    {
	udata_writeBlock(pData, (void*)data->table->sbcs.toUnicode, sizeof(UChar)*256);
        size += udata_write_ucmp8(pData, data->table->sbcs.fromUnicode);
        size += sizeof(UChar)*256;
        /* don't care aboutalignment */
      }
    break;
    
    case UCNV_DBCS:
    case UCNV_EBCDIC_STATEFUL:
      {
        size += udata_write_ucmp16(pData,data->table->dbcs.toUnicode);
        if(size%4)
        {
            udata_writePadding(pData, 4-(size%4) );
            size+= 4-(size%4);
        }
	size += udata_write_ucmp16(pData,data->table->dbcs.fromUnicode);
      }
      break;

    case UCNV_MBCS:
      {
	udata_writeBlock(pData, data->table->mbcs.starters, 256*sizeof(bool_t));
        size += 256*sizeof(bool_t);
	size += udata_write_ucmp16(pData,data->table->mbcs.toUnicode);
        if(size%4)
        {
            udata_writePadding(pData, 4-(size%4) );
            size+= 4-(size%4);
        }
	size += udata_write_ucmp16(pData,data->table->mbcs.fromUnicode);
      }
      break;

    default:
      {
	/*If it isn't any of the above, the file is invalid */
	fprintf(stderr, "Error: bad converter type, can't write!!\n");
	exit(1);
	return; /* 0; */
      }
    }
  
}