/**************************************************************************
 *
 * 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.
 *
 **************************************************************************/

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

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

void SetCStr (UCArray &text, const char *cStr, size_t nSizeHint) {
  text.erase(text.begin(), text.end());

  // reserve the needed space in advance
  if (text.capacity() < nSizeHint + 1) {
    text.reserve(nSizeHint + 1);
  }
  while (*cStr != '\0') {
    text.push_back (*cStr);
    ++cStr;
  }
}

/** char * returned becomes the responsibility of the caller */
char * GetCStr(const 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] = text[i];
    ++here; ++i;
  }
  cstr[i]='\0';
  return cstr;
}

/** char * returned becomes the responsibility of the caller */
unsigned char * MyGetCStr(const UCArray& text) {

  unsigned char *cstr = new unsigned char[text.size()+1];
  cstr[0] = text.size();
  UCArray::const_iterator here = text.begin();
  UCArray::const_iterator end = text.end();

  int i = 1;
  while (here != end) {
    cstr[i] = text[i-1];
    ++here; ++i;
  }
  //  cstr[i]='\0';
  return cstr;
}

bool UCArrayCStrEquals(const UCArray &text, const unsigned char *cStr)
{
  if ((cStr == NULL || *cStr == '\0') && text.empty()) return true;
  UCArray::const_iterator thisUC = text.begin();
  UCArray::const_iterator endUC = text.end();
  while (thisUC != endUC && *cStr != '\0') {
    if (*thisUC != *cStr) return false;
    ++cStr; ++thisUC;
  }
  if (thisUC == endUC && *cStr == '\0') return true;
  return false;
}

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, mg_u_long &n) {
  register mg_u_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, mg_u_long n) {
  register mg_u_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, mg_u_long &n) {
  if (fread (&n, sizeof (mg_u_long), 1, f) <= 0) return false;
  NTOHUL (n);
  return true;
}


bool WriteUL (FILE *f, mg_u_long n) {
  HTONUL (n);
  return (fwrite (&n, sizeof (mg_u_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
  mg_u_long arraySize = 0;
  if (!ReadVarLenUL (f, arraySize)) return false;

  // reserve the needed space in advance
  if (a.capacity() < arraySize + 1) {
    a.reserve(arraySize + 1);
  }

  // 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 short a1_out[256]; /* temp space */
  unsigned short a2_out[256]; /* temp space */

  unsigned char * a1_str = (unsigned char *)MyGetCStr(a1);
  unsigned char * a2_str = (unsigned char *)MyGetCStr(a2);
  
  /* decode the words to unicode */
  utf8_word_to_unicode (a1_str, a1_out, 255);
  utf8_word_to_unicode (a2_str, a2_out, 255);

  delete []a1_str;
  delete []a2_str;

  int l1 = a1_out[0];
  int l2 = a2_out[0];

  int len = (l1 < l2) ? l1 : l2;
  int pos = 0;
  int diff = 0;
  for (int i=1; i<=len; ++i) {
    if ((diff = unicode_tosimplified(unicode_tolower(a1_out[i])) - 
	 unicode_tosimplified(unicode_tolower(a2_out[i]))) != 0) {
      return diff;
    }
    if ((pos == 0) && (diff = a1_out[i] - a2_out[i]) != 0) {
      pos = diff;
    }
  }
  return ((l1 - l2) ? (l1 - l2) : (pos));
  
}

// 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));
// }

// does the first string start with the second?
bool StartsWith (const UCArray &a1, const UCArray &a2) {
  unsigned int l1 = a1.size();
  unsigned int l2 = a2.size();
  if (l2 > l1) {
    // if the prefix is longer than the string, it can't start with it
    return false; 
  }
  unsigned int l =l2;
  UCArray::const_iterator a1Here = a1.begin();
  UCArray::const_iterator a2Here = a2.begin();
  
  while (l--) {
    if ((*a1Here != *a2Here))
      return false;
    ++a1Here;
    ++a2Here;
  }
  return true; // we have successfully matched the whole way
    
}

// does the first string start with the second, ignoring case?
bool StartsWithCasefold(const UCArray &a1, const UCArray &a2) {
  unsigned int l1 = a1.size();
  unsigned int l2 = a2.size();
  if (l2 > l1) {
    // if the prefix is longer than the string, it can't start with it
    return false; 
  }
  unsigned short a1_out[256]; /* temp space */
  unsigned short a2_out[256]; /* temp space */
  unsigned char * a1_str = (unsigned char *)MyGetCStr(a1);
  unsigned char * a2_str = (unsigned char *)MyGetCStr(a2);
  
  /* decode the words to unicode */
  utf8_word_to_unicode (a1_str, a1_out, 255);
  utf8_word_to_unicode (a2_str, a2_out, 255);

  delete []a1_str;
  delete []a2_str;

  unsigned int len = a2_out[0];;  
  for (int i=1; i<=len; ++i) {
    if (unicode_tosimplified(unicode_tolower(a1_out[i])) != 
	unicode_tosimplified(unicode_tolower(a2_out[i])) ) return false;
    
  }
  return true; // we have successfully matched the whole way
    
}

// does the first string start with the second, ignoring case?
// bool StartsWithCasefold(const UCArray &a1, const UCArray &a2) {
//   unsigned int l1 = a1.size();
//   unsigned int l2 = a2.size();
//   if (l2 > l1) {
//     // if the prefix is longer than the string, it can't start with it
//     return false; 
//   }
//   unsigned int l =l2;
//   UCArray::const_iterator a1Here = a1.begin();
//   UCArray::const_iterator a2Here = a2.begin();
  
//   while (l--) {
//     if (casecharmap[*a1Here] != casecharmap[*a2Here]) 
//       return false;
//     ++a1Here;
//     ++a2Here;
//   }
//   return true; // we have successfully matched the whole way
    
// }


mg_u_long PrefixLen (const UCArray &a1, const UCArray &a2) {
  mg_u_long l = (a1.size() < a2.size()) ? a1.size() : a2.size();
  mg_u_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;
  char* tmp=GetCStr(a);
  int ret=(fwrite (tmp+preLen, sizeof (char), sufLen, f) == sufLen);
  delete []tmp;
  return (ret != 0);
}

// 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());

  // reserve the needed space in advance
  if (a.capacity() < a.size() + sufLen + 1) {
    a.reserve(a.size() + sufLen + 1);
  }

  while (sufLen > 0) {
    unsigned char c = fgetc (f);
    a.push_back (c);
    --sufLen;
  }

  return true;
}