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           #include <pgm.h>
           void pgm_init( int *argcP, char *argv[] );
           gray ** pgm_allocarray( int cols, int rows );
           gray * pgm_allocrow( intcols );
           void pgm_freearray( gray **grays, introws );
           void pgm_freerow( gray *grayrow);
           void  pgm_readpgminit( FILE *fp, int *colsP, int *rowsP, gray *maxvalP,
           int *formatP );
           void pgm_readpgmrow( FILE *fp, gray *grayrow, int  cols,  gray  maxval,
           int format );
           gray ** pgm_readpgm( FILE *fp, int *colsP, int *rowsP, gray *maxvalP );
           void pgm_writepgminit( FILE *  fp , int cols, int  rows,  gray  maxval,
           int forceplain );
           void  pgm_writepgmrow(  FILE *fp, gray *grayrow, int cols, gray maxval,
           int forceplain );
           void pgm_writepgm( FILE *fp, gray ** grays, int cols,  int  rows,  gray
           maxval, int forceplain );
           void  pgm_writepgm(  FILE  *fp,  gray **grays, int cols, int rows, gray
           maxval, int forceplain );
           void pgm_nextimage( FILE *file, int * const eofP);
           void pgm_check( FILE * file, const enum pm_check_type check_type, const
           int  format,  const  int  cols,  const int rows, const int maxval, enum
           pm_check_code * const retval);
           typedef ... gray;
           #define PGM_MAXMAXVAL ...
           #define PGM_OVERALLMAXVAL ...
           extern gray pgm_pbmmaxval;
           #define PGM_FORMAT ...
           #define RPGM_FORMAT ...
           PGM_MAXMAXVAL is the maximum value of a maxval in a PGM  file  that  is
           compatible  with the PGM format as it existed before April 2000.  It is
           also the maximum value of a maxval that results in the minimum possible
           raster  size for a particular image.  I.e an image with a maxval higher
           than PGM_MAXMAXVAL cannot be read or generated by  old  PGM  processing
           programs and requires more file space.
           PGM_FORMAT  is  the  format  code  for  a  Plain PGM format image file.
           RPGM_FORMAT is the format  code  for  a  Raw  PGM  format  image  file.
           PGM_TYPE  is the format type code for the PGM formats.  PGM_FORMAT_TYPE
           is a macro that generates code to compute the format type code of a PBM
           or PGM format from the format code which is its argument.
           All  PGM  programs  must  call pgm_init() just after invocation, before
           they process their arguments.
           pgm_allocarray() allocates an array of grays.
           pgm_allocrow() allocates a row of the given number of grays.
           pgm_freearray() frees the array allocated  with  pgm_allocarray()  con-
           taining the given number of rows.
           pgm_freerow() frees a row of grays allocated with pgm_allocrow().
           If a function in this section is called on a PBM format file, it trans-
           lates the PBM file into a PGM file on the fly and functions  as  if  it
           were  called  on the equivalent PGM file.  The format value returned by
           pgm_readpgminit() is,  however,  not  translated.   It  represents  the
           actual format of the PBM file.
           pgm_readpgminit()  reads  the  header  of a PGM file, returning all the
           information from the header and leaving the file positioned just  after
           the header.
           pgm_readpgmrow()  reads a row of grays into the grayrow array.  format,
           cols, and maxval are the values returned by pgm_readpgminit().
           pgm_readpgm() reads an entire PGM  image  into  memory,  returning  the
           allocated  array as its return value and returning the information from
           the  header  as  rows,  cols,  and  maxval.   This  function   combines
           pgm_readpgminit(), pgm_allocarray(), and pgm_readpgmrow().
           pgm_writepgminit() writes the header for a PGM file and leaves it posi-
           pgm_nextimage()  positions a PGM input file to the next image in it (so
           that a subsequent pgm_readpgminit() reads its header).
           pgm_nextimage() is analogous to pbm_nextimage(), but works on  PGM  and
           PBM files.
           pgm_check()  checks  for the common file integrity error where the file
           is the wrong size to contain all the image data.
           pgm_check() is analogous to pbm_check(),  but  works  on  PGM  and  PBM


           libpbm(3), libppm(3), libpnm(3)

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