# include <cstdlib>
# include <iostream>
# include <iomanip>
# include <fstream>
# include <cmath>

using namespace std;

# include "pgmb_io.hpp"

//****************************************************************************80

char ch_cap ( char ch )

//****************************************************************************80
//
//  Purpose:
//
//    CH_CAP capitalizes a single character.
//
//  Discussion:
//
//    This routine should be equivalent to the library "toupper" function.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
//
//    19 July 1998
//
//  Author:
//
//    John Burkardt
//
//  Parameters:
//
//    Input, char CH, the character to capitalize.
//
//    Output, char CH_CAP, the capitalized character.
//
{
  if ( 97 <= ch && ch <= 122 ) 
  {
    ch = ch - 32;
  }   

  return ch;
}
//****************************************************************************80

bool pgmb_check_data ( int xsize, int ysize, unsigned char maxg, 
  unsigned char *g )

//****************************************************************************80
//
//  Purpose:
//
//    PGMB_CHECK_DATA checks the data for a binary portable gray map file.
//
//  Discussion:
//
//    XSIZE and YSIZE must be positive, the pointers must not be null,
//    and the data must be nonnegative and no greater than MAXG.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
//
//    15 April 2003
//
//  Author:
//
//    John Burkardt
//
//  Parameters:
//
//    Input, int XSIZE, YSIZE, the number of rows and columns of data.
//
//    Input, unsigned char MAXG, the maximum gray value.
//
//    Input, unsigned char *G, the array of XSIZE by YSIZE data values.
//
//    Output, bool PGMB_CHECK_DATA, is
//    true, if an error was detected, or
//    false, if the data was legal.
//
{
  int i;
  unsigned char *index;
  int j;
  int k;

  if ( xsize <= 0 )
  {
    cout << "\n";
    cout << "PGMB_CHECK_DATA: Error!\n";
    cout << "  xsize <= 0.\n";
    cout << "  xsize = " << xsize << "\n";
    return true;
  }

  if ( ysize <= 0 )
  {
    cout << "\n";
    cout << "PGMB_CHECK_DATA: Error!\n";
    cout << "  ysize <= 0.\n";
    cout << "  ysize = " << ysize << "\n";
    return true;
  }

  if ( g == NULL )
  {
    cout << "\n";
    cout << "PGMB_CHECK_DATA: Error!\n";
    cout << "  Null pointer to g.\n";
    return true;
  }

  index = g;

  for ( j = 0; j < ysize; j++ )
  {
    for ( i = 0; i < xsize; i++ )
    {
      if ( maxg < *index )
      {
        cout << "\n";
        cout << "PGMB_CHECK_DATA - Fatal error!\n";
        cout << "  Data exceeds MAXG = " << ( int ) maxg << "\n";
        cout << "  G(" << i << "," << j << ")=" << ( int ) (*index) << "\n";
        return true;
      }

      index = index + 1;
    }
  } 

  return false;
}
//****************************************************************************80

bool pgmb_example ( int xsize, int ysize, unsigned char *g )

//****************************************************************************80
//
//  Purpose:
//
//    PGMB_EXAMPLE sets up some data for a binary portable gray map file.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
//
//    15 April 2003
//
//  Author:
//
//    John Burkardt
//
//  Parameters:
//
//    Input, int XSIZE, YSIZE, the number of rows and columns of data.
//
//    Output, unsigned char *G, the array of XSIZE by YSIZE gray values.
//
//    Output, bool PGMB_EXAMPLE, is
//    false, if no error occurred,
//    true, if an error occurred.
//
{
  int i;
  unsigned char *indexg;
  int j;
  int periods = 3;
  float PI = 3.14159265;
  float x;
  float y;

  indexg = g;

  for ( i = 0; i < ysize; i++ )
  {
    y = ( ( float ) ( 2 * i ) ) / ( ( float ) ( ysize - 1 ) ) - 1.0;

    for ( j = 0; j < xsize; j++ )
    {
      x = ( 2.0 * PI * ( float ) ( periods * j ) ) / ( ( float ) ( xsize - 1 ) );

      *indexg = ( unsigned char ) ( 20.0 * ( sin ( x ) - y + 2 ) );
 
      indexg = indexg + 1;
    }
  }

  return false;
}
//****************************************************************************80

bool pgmb_read ( string input_name, int &xsize, int &ysize, 
  unsigned char &maxg, unsigned char **g )

//****************************************************************************80
//
//  Purpose:
//
//    PGMB_READ reads the header and data from a binary portable gray map file.
// 
//  Discussion:
//
//    Thanks to Jonas Schwertfeger for pointing out that, especially on 
//    Microsoft Windows systems, a binary file needs to be opened as a 
//    binary file!
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
// 
//    22 July 2011
// 
//  Author:
// 
//    John Burkardt
//
//  Parameters:
//
//    Input, string INPUT_NAME, the name of the file containing the binary
//    portable gray map data.
//
//    Output, int &XSIZE, &YSIZE, the number of rows and columns of data.
//
//    Output, unsigned char &MAXG, the maximum gray value.
//
//    Output, unsigned char **G, the array of XSIZE by YSIZE data values.
//
//    Output, bool PGMB_READ, is true if an error occurred.
//
{
  bool error;
  ifstream input;
  int numbytes;

  input.open ( input_name.c_str ( ), ios::binary );

  if ( !input )
  {
    cout << "\n";
    cout << "PGMB_READ: Fatal error!\n";
    cout << "  Cannot open the input file " << input_name << "\n";
    return true;
  }
//
//  Read the header.
//
  error = pgmb_read_header ( input, xsize, ysize, maxg );

  if ( error )
  {
    cout << "\n";
    cout << "PGMB_READ: Fatal error!\n";
    cout << "  PGMB_READ_HEADER failed.\n";
    return true;
  }
//
//  Allocate storage for the data.
//
  *g = new unsigned char [ xsize * ysize ];
//
//  Read the data.
//
  error = pgmb_read_data ( input, xsize, ysize, *g );

  if ( error )
  {
    cout << "\n";
    cout << "PGMB_READ: Fatal error!\n";
    cout << "  PGMB_READ_DATA failed.\n";
    return true;
  }
//
//  Close the file.
//
  input.close ( );

  return false;
}
//****************************************************************************80

bool pgmb_read_data ( ifstream &input, int xsize, int ysize, 
  unsigned char *g )

//****************************************************************************80
//
//  Purpose:
//
//    PGMB_READ_DATA reads the data in a binary portable gray map file.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
//
//    16 December 2004
//
//  Author:
//
//    John Burkardt
//
//  Parameters:
//
//    Input, ifstream &INPUT, a pointer to the file containing the binary
//    portable gray map data.
//
//    Input, int XSIZE, YSIZE, the number of rows and columns of data.
//
//    Output, unsigned char *G, the array of XSIZE by YSIZE data values.
//
//    Output, bool PGMB_READ_DATA, is true if an error occurred.
//
{
  char c;
  bool error;
  int i;
  unsigned char *indexg;
  int j;

  indexg = g;

  for ( j = 0; j < ysize; j++ )
  {
    for ( i = 0; i < xsize; i++ )
    {
      input.read ( &c, 1 );
      *indexg = ( unsigned char ) c;
      indexg = indexg + 1;
      error = input.eof();
      if ( error )
      {
        cout << "\n";
        cout << "PGMB_READ_DATA - Fatal error!\n";
        cout << "  End of file reading pixel (" 
          << i << ", " << j <<") \n";
        return true;
      }
    }
  }
  return false;
}
//****************************************************************************80

bool pgmb_read_header ( ifstream &input, int &xsize, int &ysize, 
  unsigned char &maxg )

//****************************************************************************80
//
//  Purpose:
//
//    PGMB_READ_HEADER reads the header of a binary portable gray map file.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
//
//    22 July 2011
//
//  Author:
//
//    John Burkardt
//
//  Parameters:
//
//    Input, ifstream &INPUT, a pointer to the file containing the binary
//    portable gray map data.
//
//    Output, int &XSIZE, &YSIZE, the number of rows and columns of data.
//
//    Output, unsigned char &MAXG, the maximum gray value.
//
//    Output, bool PGMB_READ_HEADER, is true if an error occurred.
//
{
  int count;
  int fred;
  string line;
  int maxg2;
  string rest;
  int step;
  int width;
  string word;

  step = 0;

  while ( 1 )
  {
    getline ( input, line );

    if ( input.eof ( ) )
    {
      cout << "\n";
      cout << "PGMB_READ_HEADER - Fatal error!\n";
      cout << "  End of file.\n";
      return true;
    }

    if ( line[0] == '#' )
    {
      continue;
    }

    if ( step == 0 )
    {
      s_word_extract_first ( line, word, rest );

      if ( s_len_trim ( word ) <= 0 )
      {
        continue;
      }

      if ( !s_eqi ( word, "P5" ) )
      {
        cout << "\n";
        cout << "PGMB_READ_HEADER - Fatal error.\n";
        cout << "  Bad magic number = \"" << word << "\".\n";
        return true;
      }
      line = rest;
      step = 1;
    }

    if ( step == 1 )
    {
      s_word_extract_first ( line, word, rest );
 
      if ( s_len_trim ( word ) <= 0 )
      {
        continue;
      }
      xsize = atoi ( word.c_str ( ) );
      line = rest;
      step = 2;
    }

    if ( step == 2 )
    {
      s_word_extract_first ( line, word, rest );

      if ( s_len_trim ( word ) <= 0 )
      {
        continue;
      }
      ysize = atoi ( word.c_str ( ) );
      line = rest;
      step = 3;
    }

    if ( step == 3 )
    {
      s_word_extract_first ( line, word, rest );

      if ( s_len_trim ( word ) <= 0 )
      {
        continue;
      }
      fred = atoi ( word.c_str ( ) );
      maxg = ( unsigned char ) fred;
      line = rest;
      break;
    }
  }

  return false;
}
//****************************************************************************80

bool pgmb_read_test ( string input_name )

//****************************************************************************80
//
//  Purpose:
//
//    PGMB_READ_TEST tests the binary portable gray map read routines.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
//
//    22 July 2011
//
//  Author:
//
//    John Burkardt
//
//  Parameters:
//
//    Input, string INPUT_NAME, the name of the file containing the binary
//    portable gray map data.
//
//    Output, bool PGMB_READ_TEST, is true if an error occurred.
//
{
  bool error;
  unsigned char *g;
  unsigned char maxg;
  int xsize;
  int ysize;
//
//  Read the data.
//
  error = pgmb_read ( input_name, xsize, ysize, maxg, &g );

  if ( error )
  {
    cout << "\n";
    cout << "PGMB_READ_TEST: Fatal error!\n";
    cout << "  PGMB_READ failed.\n";
    delete [] g;
    return true;
  }
//
//  Check the data.
//
  error = pgmb_check_data ( xsize, ysize, maxg, g );

  delete [] g;

  if ( error )
  {
    cout << "\n";
    cout << "  PGMB_CHECK_DATA reports bad data from the file.\n";
    return true;
  }

  cout << "\n";
  cout << "  PGMB_CHECK_DATA passes the data from the file.\n";

  return false;
}
//****************************************************************************80

bool pgmb_write ( string output_name, int xsize, int ysize, unsigned char *g )

//****************************************************************************80
//
//  Purpose:
//
//    PGMB_WRITE writes the header and data for a binary portable gray map file.
//
//  Discussion:
//
//    Thanks to Jonas Schwertfeger for pointing out that, especially on Microsoft
//    Windows systems, a binary file needs to be opened as a binary file!
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
// 
//    02 April 2005
// 
//  Author:
// 
//    John Burkardt
//
//  Parameters:
//
//    Input, string OUTPUT_NAME, the name of the file to contain the binary
//    portable gray map data.
//
//    Input, int XSIZE, YSIZE, the number of rows and columns of data.
//
//    Input, int *G, the array of XSIZE by YSIZE data values.
//
//    Output, bool PGMB_WRITE, is true if an error occurred.
//
{
  bool error;
  ofstream output;
  int i;
  unsigned char *indexg;
  int j;
  unsigned char maxg;
//
//  Determine the maximum gray value.
//
  maxg = 0;
  indexg = g;

  for ( i = 0; i < xsize; i++ )
  {
    for ( j = 0; j < ysize; j++ )
    {
      if ( maxg < *indexg )
      {
        maxg = *indexg;
      }
      indexg = indexg + 1;
    }
  }
//
//  Open the file.
//
  output.open ( output_name.c_str ( ), ios::binary );

  if ( !output )
  {
    cout << "\n";
    cout << "PGMB_WRITE: Fatal error!\n";
    cout << "  Cannot open the output file " << output_name << "\n";
    return true;
  }
//
//  Write the header.
//
  error = pgmb_write_header ( output, xsize, ysize, maxg );

  if ( error )
  {
    cout << "\n";
    cout << "PGMB_WRITE: Fatal error!\n";
    cout << "  PGMB_WRITE_HEADER failed.\n";
    return true;
  }
//
//  Write the data.
//
  error = pgmb_write_data ( output, xsize, ysize, g );

  if ( error )
  {
    cout << "\n";
    cout << "PGMB_WRITE: Fatal error!\n";
    cout << "  PGMB_WRITE_DATA failed.\n";
    return true;
  }
//
//  Close the file.
//
  output.close ( );

  return false;
}
//****************************************************************************80

bool pgmb_write_data ( ofstream &output, int xsize, int ysize, 
  unsigned char *g )

//****************************************************************************80
//
//  Purpose:
//
//    PGMB_WRITE_DATA writes the data for a binary portable gray map file.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
//
//    16 April 2003
//
//  Author:
//
//    John Burkardt
//
//  Parameters:
//
//    Input, ofstream &OUTPUT, a pointer to the file to contain the binary
//    portable gray map data.
//
//    Input, int XSIZE, YSIZE, the number of rows and columns of data.
//
//    Input, unsigned char *G, the array of XSIZE by YSIZE data values.
//
//    Output, bool PGMB_WRITE_DATA, is true if an error occurred.
//
{
  int i;
  unsigned char *indexg;
  int j;

  indexg = g;

  for ( j = 0; j < ysize; j++ )
  {
    for ( i = 0; i < xsize; i++ )
    {
      output << *indexg;
      indexg = indexg + 1;
    }
  }

  return false;
}
//****************************************************************************80

bool pgmb_write_header ( ofstream &output, int xsize, int ysize, 
  unsigned char maxg )

//****************************************************************************80
//
//  Purpose:
//
//    PGMB_WRITE_HEADER writes the header of a binary portable gray map file.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
//
//    16 April 2003
//
//  Author:
//
//    John Burkardt
//
//  Parameters:
//
//    Input, ofstream &OUTPUT, a pointer to the file to contain the binary
//    portable gray map data.
//
//    Input, int XSIZE, YSIZE, the number of rows and columns of data.
//
//    Input, unsigned char MAXG, the maximum gray value.
//
//    Output, bool PGMB_WRITE_HEADER, is true if an error occurred.
//
{
  output << "P5" << " "
           << xsize << " " 
           << ysize << " " 
           << ( int ) maxg << "\n";

  return false;
}
//****************************************************************************80

bool pgmb_write_test ( string output_name )

//****************************************************************************80
//
//  Purpose:
//
//    PGMB_WRITE_TEST tests the binary portable gray map write routines.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
//
//    16 April 2003
//
//  Author:
//
//    John Burkardt
//
//  Parameters:
//
//    Input, string OUTPUT_NAME, the name of the file to contain the binary
//    portable gray map data.
//
//    Output, bool PGMB_WRITE_TEST, is true if an error occurred.
//
{
  bool error;
  unsigned char *g;
  int xsize;
  int ysize;
//
//  Set the data.
//
  xsize = 300;
  ysize = 200;

  g = new unsigned char[ xsize * ysize ];

  error = pgmb_example ( xsize, ysize, g );

  if ( error )
  {
    cout << "\n";
    cout << "PGMB_WRITE_TEST: Fatal error!\n";
    cout << "  PGM_EXAMPLE failed.\n";
    return true;
  }

  error = pgmb_write ( output_name, xsize, ysize, g );

  delete [] g;

  if ( error )
  {
    cout << "\n";
    cout << "PGMB_WRITE_TEST: Fatal error!\n";
    cout << "  PGMB_WRITE failed.\n";
    return true;
  }

  return false;
}
//****************************************************************************80

bool s_eqi ( string s1, string s2 )

//****************************************************************************80
//
//  Purpose:
//
//    S_EQI reports whether two strings are equal, ignoring case.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
//
//    05 July 2009
//
//  Author:
//
//    John Burkardt
//
//  Parameters:
//
//    Input, string S1, S2, two strings.
//
//    Output, bool S_EQI, is true if the strings are equal. 
//
{
  int i;
  int nchar;
  int s1_length;
  int s2_length;

  s1_length = s1.length ( );
  s2_length = s2.length ( );

  if ( s1_length < s2_length )
  {
    nchar = s1_length;
  }
  else
  {
    nchar = s2_length;
  }
//
//  The strings are not equal if they differ over their common length.
//
  for ( i = 0; i < nchar; i++ ) 
  {

    if ( ch_cap ( s1[i] ) != ch_cap ( s2[i] ) ) 
    {
      return false;
    }
  }
//
//  The strings are not equal if the longer one includes nonblanks
//  in the tail.
//
  if ( nchar < s1_length ) 
  {
    for ( i = nchar; i < s1_length; i++ ) 
    {
      if ( s1[i] != ' ' ) 
      {
        return false;
      }
    } 
  }
  else if ( nchar < s2_length ) 
  {
    for ( i = nchar; i < s2_length; i++ )
    {
      if ( s2[i] != ' ' ) 
      {
        return false;
      }
    } 
  }

  return true;
}
//****************************************************************************80

int s_len_trim ( string s )

//****************************************************************************80
//
//  Purpose:
//
//    S_LEN_TRIM returns the length of a string to the last nonblank.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
//
//    05 July 2009
//
//  Author:
//
//    John Burkardt
//
//  Parameters:
//
//    Input, string S, a string.
//
//    Output, int S_LEN_TRIM, the length of the string to the last nonblank.
//    If S_LEN_TRIM is 0, then the string is entirely blank.
//
{
  int n;

  n = s.length ( );

  while ( 0 < n ) 
  {
    if ( s[n-1] != ' ' )
    {
      return n;
    }
    n = n - 1;
  }

  return n;
}
//****************************************************************************80

void s_word_extract_first ( string s, string &s1, string &s2 )

//****************************************************************************80
//
//  Purpose:
//
//    S_WORD_EXTRACT_FIRST extracts the first word from a string.
//
//  Discussion:
//
//    A "word" is a string of characters terminated by a blank or
//    the end of the string.
//
//  Licensing:
//
//    This code is distributed under the GNU LGPL license. 
//
//  Modified:
//
//    25 October 2010
//
//  Author:
//
//    John Burkardt
//
//  Parameters:
//
//    Input, string S, the string.
//
//    Output, string &S1, the first word (initial blanks removed).
//
//    Output, string &S2, the remainder of the string, after removing
//    the first word (initial blanks removed).
//
{
  int i;
  int mode;
  int s_len;

  s_len = s.length ( );
  s1 = "";
  s2 = "";
  mode = 1;

  for ( i = 0; i < s_len; i++ )
  {
    if ( mode == 1 )
    {
      if ( s[i] != ' ' )
      {
         mode = 2;
      }
    }
    else if ( mode == 2 )
    {
      if ( s[i] == ' ' )
      {
        mode = 3;
      }
    }
    else if ( mode == 3 )
    {
      if ( s[i] != ' ' )
      {
        mode = 4;
      }
    }
    if ( mode == 2 )
    {
      s1 = s1 + s[i];
    }
    else if ( mode == 4 )
    {
      s2 = s2 + s[i];
    }
  }

  return;
}