/**************************************************************************
 *
 * UCArray.cpp -- vector based string class
 * Copyright (C) 1999  Rodger McNab
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id: UCArray.cpp 1279 2000-07-12 22:21:53Z sjboddie $
 *
 **************************************************************************/

#include "UCArray.h"
#include "netorder.h"  /* [RPAP - Jan 97: Endian Ordering] */


void SetCStr (UCArray &text, const char *cStr) {
  text.erase(text.begin(), text.end());
  
  while (*cStr != '\0') {
    text.push_back (*cStr);
    cStr++;
  }
}

char * GetCStr(UCArray text) {

  char *cstr = new char[text.size()+1];
  UCArray::const_iterator here = text.begin();
  UCArray::const_iterator end = text.end();

  int i = 0;
  while (here != end) {
    cstr[i] = (char)*here;
    here++; i++;
  }
  cstr[i]='\0';
  return cstr;
}

ostream &operator<<(ostream &s, const UCArray &a) {
  UCArray::const_iterator here = a.begin();
  UCArray::const_iterator end = a.end();
  while (here != end) {
    s << *here;
    here++;
  }

  return s;
}


bool ReadVarLenUL (FILE *f, unsigned long &n) {
  register unsigned long temp = 0;
  register unsigned int bitPos = 0;
  unsigned char b = 0;

  do {
    b = fgetc (f);
    if (feof(f)) return false;
    temp |= (b & 0x7f) << bitPos;
    bitPos += 7;
  } while (b >= 0x80 && bitPos < 32);

  n = temp;
  
  return true;
}

bool WriteVarLenUL (FILE *f, unsigned long n) {
  register unsigned long temp = n;
  register unsigned char b = 0;
  do {
    b = static_cast<unsigned char> (temp & 0x7f);
    if (temp >= 0x80) b |= 0x80;
    fputc (b, f);
    if (ferror (f) != 0) return false;
  } while ((temp = temp >> 7) > 0);
  
  return true;
}


bool ReadUL (FILE *f, unsigned long &n) {
  if (fread (&n, sizeof (unsigned long), 1, f) <= 0) return false;
  NTOHUL (n);
  return true;
}


bool WriteUL (FILE *f, unsigned long n) {
  HTONUL (n);
  return (fwrite (&n, sizeof (unsigned long), 1, f) > 0);
}

bool ReadF (FILE *f, float &n) {
  if (fread (&n, sizeof (float), 1, f) <= 0) return false;
  NTOHF(n);
  return true;
}

bool WriteF (FILE *f, float n) {
  HTONF(n);
  return (fwrite (&n, sizeof (float), 1, f) > 0);
}

bool ReadD (FILE *f, double &n) {
  if (fread (&n, sizeof (double), 1, f) <= 0) return false;
  NTOHD(n);
  return true;
}

bool WriteD (FILE *f, double n) {
  HTOND(n);
  return (fwrite (&n, sizeof (double), 1, f) > 0);
}

bool ReadUCArray (FILE *f, UCArray &a) {
  // clear the array in preparation
  a.erase (a.begin(), a.end());

  // read in the array size
  unsigned long arraySize = 0;
  if (!ReadVarLenUL (f, arraySize)) return false;

  // read in the array
  unsigned char b = 0;
  while (arraySize > 0) {
    b = fgetc (f);
    if (feof(f)) return false;
    a.push_back (b);
    
    arraySize--;
  }
  
  return true;
}

bool WriteUCArray (FILE *f, const UCArray &a) {
  // write out the array size
  if (!WriteVarLenUL (f, a.size())) return false;

  UCArray::const_iterator here = a.begin();
  UCArray::const_iterator end = a.end();
  while (here != end) {
    fputc (*here, f);
    if (ferror (f) != 0) return false;
    
    here++;
  }
  
  return true;
}

/*
 * This array is designed for mapping upper and lower case letter
 * together for a case independent comparison.  The mappings are
 * based upon ascii character sequences.
 */
static unsigned char casecharmap[] = {
	'\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
	'\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
	'\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
	'\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
	'\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
	'\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
	'\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
	'\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
	'\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
	'\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
	'\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
	'\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
	'\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
	'\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
	'\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
	'\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
	'\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
	'\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
	'\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
	'\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
	'\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
	'\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
	'\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
	'\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
	'\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
	'\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
	'\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
	'\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
	'\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
	'\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
	'\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
	'\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
};


int DictCompare (const UCArray &a1, const UCArray &a2) {
  unsigned int l1 = a1.size();
  unsigned int l2 = a2.size();
  unsigned int l = (l1 < l2) ? l1 : l2;
  int pos = 0;
  register int diff = 0;

  UCArray::const_iterator a1Here = a1.begin();
  UCArray::const_iterator a2Here = a2.begin();
  
  while (l--) {
    if ((diff = casecharmap[*a1Here] - casecharmap[*a2Here]) != 0)
      return diff;
    if (pos == 0 && (diff = *a1Here - *a2Here) != 0)
      pos = diff;

    a1Here++;
    a2Here++;
  }

  return ((l1 - l2) ? (l1 - l2) : (pos));
}

/* comparison for browse index - items match if the smaller word
   is a prefix of the larger word, case independent
*/
int BrowseCompare (const UCArray &a1, const UCArray &a2) {
  unsigned int l1 = a1.size();
  unsigned int l2 = a2.size();
  unsigned int l = (l1 < l2) ? l1 : l2; // l is the shorter of the two
  int diff = 0;

  UCArray::const_iterator a1Here = a1.begin();
  UCArray::const_iterator a2Here = a2.begin();

  while(l--) {
    if ((diff = casecharmap[*a1Here] - casecharmap[*a2Here]) !=0)
      return diff;
    a1Here++;
    a2Here++;
  }
  return 0;

}

unsigned long PrefixLen (const UCArray &a1, const UCArray &a2) {
  unsigned long l = (a1.size() < a2.size()) ? a1.size() : a2.size();
  unsigned long i = 0;

  UCArray::const_iterator a1Here = a1.begin();
  UCArray::const_iterator a2Here = a2.begin();

  while (i < l && *a1Here == *a2Here) {
    i++; a1Here++; a2Here++;
  }
  
  return i;
}

bool WritePreSufStr (FILE *f, const UCArray *prev, const UCArray &a) {
  unsigned char preLen;
  unsigned char sufLen;
  
  if (prev != NULL) preLen = PrefixLen (*prev, a);
  else preLen = 0;
  sufLen = a.size() - preLen;

  // output the prefix length, suffix length, and the suffix
  fputc (preLen, f);
  if (ferror(f) != 0) return false;
  fputc (sufLen, f);
  if (ferror(f) != 0) return false;
  return (fwrite ((char *)a.begin()+preLen, sizeof (char), sufLen, f) == sufLen);
}

// a also used for prev
bool ReadPreSufStr (FILE *f, UCArray &a) {
  unsigned char preLen = 0;
  unsigned char sufLen = 0;

  preLen = fgetc(f);
  sufLen = fgetc(f);

  if (a.size () > preLen) a.erase (a.begin()+preLen, a.end());
  while (sufLen > 0) {
    unsigned char c = fgetc (f);
    a.push_back (c);
    sufLen--;
  }

  return true;
}