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subset.c

/*--------------------------------------------------------------------------
  ----- File:        subset.c 
  ----- Author:      Rainer Menzner (Rainer.Menzner@web.de)
  ----- Date:        2002-12-07
  ----- Description: This file is part of t1lib. The program subset reads
                     a font file name and a string from the commandline
                 and creates a subset of the font which is sufficient
                 to display the string. It is an example of how to use
                 font subsetting.
  ----- Copyright:   t1lib is copyrighted (c) Rainer Menzner, 1996-2002. 
                     As of version 0.5, t1lib is distributed under the
                 GNU General Public Library Lincense. The
                 conditions can be found in the files LICENSE and
                 LGPL, which should reside in the toplevel
                 directory of the distribution.  Please note that 
                 there are parts of t1lib that are subject to
                 other licenses:
                 The parseAFM-package is copyrighted by Adobe Systems
                 Inc.
                 The type1 rasterizer is copyrighted by IBM and the
                 X11-consortium.
  ----- Warranties:  Of course, there's NO WARRANTY OF ANY KIND :-)
  ----- Credits:     I want to thank IBM and the X11-consortium for making
                     their rasterizer freely available.
                 Also thanks to Piet Tutelaers for his ps2pk, from
                 which I took the rasterizer sources in a format
                 independent from X11.
                     Thanks to all people who make free software living!
--------------------------------------------------------------------------*/


#include <stdio.h>
#include <string.h>
/* Note: We include t1lib.h from lib/t1lib. That way the objectfile does only
   need to be rebuild when the header itself changes and not each time the
   library has been recompiled */
#include "../lib/t1lib/t1lib.h"


void printusage( void);


int main(int argc, char *argv[])
{

  int i, j, result;
  int realargs=0;
  int logfile=0;
  char mask[256];
  int flags=T1_SUBSET_DEFAULT;
  char *subset=NULL;
  unsigned long ofsize=0;
  FILE *ofp=stdout;
  
  
  if (argc==1){
    printusage();
    return(0);
  }

  /* If we want to log anything, then log all */
  T1_SetLogLevel(T1LOG_DEBUG);

  realargs=argc-1;

  for (j=1; j<argc; j++) {
    if (argv[j][0]=='-') {
      if (strcmp( argv[j], "-l")==0) {
      realargs -=1;
      logfile=1;
      }
      else if (strcmp( argv[j], "-a")==0) {
      /* default case */
      realargs -=1;
      }
      else if (strcmp( argv[j], "-b")==0) {
      realargs -=1;
      flags |=T1_SUBSET_ENCRYPT_BINARY;
      }
      else if (strcmp( argv[j], "-f")==0) {
      realargs -=1;
      flags |=T1_SUBSET_FORCE_REENCODE;
      }
      else if (strcmp( argv[j], "-s")==0) {
      realargs -=1;
      flags |=T1_SUBSET_SKIP_REENCODE;
      }
      else {
      fprintf(stderr, "subset: Unknown option: %s\n", argv[j]);
      printusage();
      return( 1);
      }
    }
    else {
      i=j;  /* this is assumed to be the first font file name */
      break;
    }
  }
  
  
  if (realargs<2) {
    fprintf( stderr, "subset: Need at least one font file and one string\n");
    printusage();
    return( 1);
  }
  
  
  if (logfile!=0) {
    if ((T1_InitLib( LOGFILE | 
                 IGNORE_CONFIGFILE |
                 IGNORE_FONTDATABASE)==NULL)) {
      fprintf(stderr, "subset: Initialization of t1lib failed (T1_errno=%d)\n",
            T1_errno);
      return(1);
    }
  }
  else {
    if ((T1_InitLib( NO_LOGFILE | 
                 IGNORE_CONFIGFILE |
                 IGNORE_FONTDATABASE)==NULL)){
      fprintf(stderr, "subset: Initialization of t1lib failed (T1_errno=%d)\n", T1_errno);
      return(1);
    }
  }
  
  
  /* First, build font data base */
  for (i=j; i<argc-1; i++){
    if ((result=T1_AddFont( argv[i]))<0)
      fprintf( stderr, "subset: Could not load font file %s (T1_errno=%d)\n",
             argv[i], T1_errno);
  }
  if (T1_GetNoFonts()<1){
    fprintf( stderr, "subset: Nothing to do\n");
    T1_CloseLib();
    return( 2);
  }
  
  /* second, setup subsetting mask from commandline string */
  for ( i=0; i<256; i++) {
    mask[i]=0;
  }
  for (i=0; i<strlen(argv[argc-1]); i++) {
    mask[(unsigned char)argv[argc-1][i]]=1;
  }
  
  /* third, load fonts, generate subset and write it stdout. */
  for( i=0; i<T1_GetNoFonts(); i++){
    fprintf( stderr, "Loading %s ... ", T1_GetFontFileName(i));
    fflush(stdout);
    if ((T1_LoadFont(i))){
      fprintf(stderr, "failed\n");
      continue;
    }
    else {
      fprintf(stderr, "finished\n");
    }
    fprintf( stderr, "Processing ... ");
    fflush(stderr);
    if ((subset=T1_SubsetFont(i, mask, flags, 64, 16384, &ofsize))==NULL) {
      fprintf(stderr, "failed (T1_errno: %d)\n", T1_errno);
    }
    else {
      fwrite(subset, 1, ofsize, ofp);
      fprintf(stderr, "finished, wrote %lu bytes\n", ofsize);
    }
    fprintf( stderr, "Removing font %d ... ", i);
    fflush(stderr);
    if ((T1_DeleteFont( i))){
      fprintf(stderr, "failed\n");
    }
    else {
      fprintf(stderr, "finished\n");
    }
  }
  
  T1_CloseLib();
  return( 0);
}


void printusage( void)
{
  fprintf(stdout, "Usage: subset [-l|-a|-b|-f|-s] <fontfile1> [<fontfile2> ...] string\n");
  fprintf(stdout, "\n");
  fprintf(stdout, "Subset fontfile(s) according to `string' and write result to stdout (T1Lib-%s)!\n",
        T1_GetLibIdent());
  fprintf(stdout, "Options: -l        Write a log-file t1lib.log\n");
  fprintf(stdout, "         -a        Create ASCII-encrypted file (default)\n");
  fprintf(stdout, "         -b        Create Binary-enrypted file\n");
  fprintf(stdout, "         -f        Force reencoding of the font\n");
  fprintf(stdout, "         -s        Skip reencoding of the font\n");
}


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