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codepage.c

/*
 * CPI.C: A program to examine MSDOS codepage files (*.cpi)
 * and extract specific codepages.
 * Compiles under Linux & DOS (using BC++ 3.1).
 *
 * Compile: gcc -o cpi cpi.c
 * Call: codepage [-a|-l|nnn] file.cpi
 *
 * Author: Ahmed M. Naas (ahmed@oea.xs4all.nl)
 * Many changes: aeb@cwi.nl  [changed until it would handle all
 *    *.cpi files people have sent me; I have no documentation,
 *    so all this is experimental]
 * Remains to do: DRDOS fonts.
 *
 * Copyright: Public domain.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int handle_codepage(int);
void handle_fontfile(void);

#define PACKED __attribute__ ((packed))
/* Use this (instead of the above) to compile under MSDOS */
/*#define PACKED  */

struct {
      unsigned char id0 PACKED;
      unsigned char id[7] PACKED;
      unsigned char res[8] PACKED;
      unsigned short pnum PACKED;    /* number of pointers */
      unsigned char ptyp PACKED;     /* type of pointers */
      unsigned long fih_offset PACKED; /* FontInfoHeader offset */
} FontFileHeader;

int drfont = 0;

#define N   4
struct {
      unsigned char num_fonts PACKED;         /* N = 4 fonts per code page*/
      unsigned char font_height[N] PACKED;
      unsigned long dfd_offset[N] PACKED; /* DisplayFontData offset */
} DRDOS_ExtendedFontFileHeader;

struct {
      unsigned short num_codepages PACKED;
} FontInfoHeader;

struct {
      unsigned short size PACKED;
      unsigned long off_nexthdr PACKED;
      unsigned short device_type PACKED; /* screen=1; printer=2 */
      unsigned char device_name[8] PACKED;
      unsigned short codepage PACKED;
      unsigned char res[6] PACKED;
      unsigned long off_font PACKED;
} CPEntryHeader;

struct {
      unsigned short reserved PACKED;
      unsigned short num_fonts PACKED;
      unsigned short size PACKED;
} CPInfoHeader;

struct {
      unsigned char height PACKED;
      unsigned char width PACKED;
      unsigned short reserved PACKED;
      unsigned short num_chars PACKED;
} ScreenFontHeader;

struct {
      unsigned short printer_type PACKED;
      unsigned short seqlength PACKED;
} PrinterFontHeader;

FILE *in, *out;
void usage(void);

int opta, optc, optl, optL, optx;
extern int optind;
extern char *optarg;

unsigned short codepage;

int main (int argc, char *argv[]) {
      if (argc < 2)
            usage();

      opta = optc = optl = optL = optx = 0;

      if (argc == 2)
            optl = 1;
      else
      while(1) {
          switch(getopt(argc, argv, "alLc")) {
            case 'a':
            opta = 1;
            continue;
            case 'c':
            optc = 1;
            continue;
            case 'L':
            optL = 1;
            continue;
            case 'l':
            optl = 1;
            continue;
            case '?':
            default:
            usage();
            case -1:
            break;
          }
          break;
        }

      if (optind < argc) {
          if ((in = fopen(argv[optind], "r")) == NULL) {
            printf("\nUnable to open file %s.\n", argv[optind]);
            exit(0);
          }
          optind++;
        } else
          usage();
      
      if (optind != argc) {
          if (optind != argc-1 || opta)
            usage();
          codepage = atoi(argv[optind]);
          optx = 1;
      }

      if (optc)
        handle_codepage(0);
      else
        handle_fontfile();

      if (optx) {
          printf("no page %d found\n", codepage);
          exit(1);
      }

      fclose(in);
      return (0);
}

void
handle_fontfile(){
      int i, j;

      j = fread(&FontFileHeader, 1, sizeof(FontFileHeader), in);
      if (j != sizeof(FontFileHeader)) {
          printf("error reading FontFileHeader - got %d chars\n", j);
          exit (1);
      }
      if (optL)
        printf("FontFileHeader: id=0x%x \"%7.7s\" res=%8.8s "
             "num=%d typ=%d fih_offset=%ld\n\n",
             FontFileHeader.id0, FontFileHeader.id, FontFileHeader.res,
             FontFileHeader.pnum, FontFileHeader.ptyp,
             FontFileHeader.fih_offset);

      if (!strcmp(FontFileHeader.id, "DRFONT ")) {
          drfont = 1;
          j = fread(&DRDOS_ExtendedFontFileHeader, 1,
                  sizeof(DRDOS_ExtendedFontFileHeader), in);
          if (j != sizeof(DRDOS_ExtendedFontFileHeader)) {
            printf("error reading ExtendedFontFileHeader - "
                   "got %d chars\n", j);
            exit (1);
          }
          if (DRDOS_ExtendedFontFileHeader.num_fonts != N) {
            printf("found %d instead of 4 fonts in drfont\n",
                   DRDOS_ExtendedFontFileHeader.num_fonts);
            exit (1);
          }
          if (optL) {
            printf("ExtendedFontFileHeader:\n");
            for (j=0; j<N; j++) {
                  printf("font%d: height %d dfd_offset %d\n", j,
                     DRDOS_ExtendedFontFileHeader.font_height[j],
                     DRDOS_ExtendedFontFileHeader.dfd_offset[j]);
            }
            printf("\n");
          }
      }

      j = fread(&FontInfoHeader, 1, sizeof(FontInfoHeader), in);
      if (j != sizeof(FontInfoHeader)) {
          printf("error reading FontInfoHeader - got %d chars\n", j);
          exit (1);
      }
      if (optL)
        printf("FontInfoHeader: num_codepages=%d\n\n",
             FontInfoHeader.num_codepages);

#if 1
      if (drfont) {
          printf("this program cannot handle DRDOS font files\n");
          exit(1);
      }
#endif

      for (i = FontInfoHeader.num_codepages; i; i--)
        if (handle_codepage(i-1))
          break;
}

int
handle_codepage(int more_to_come) {
        int j;
      char outfile[20];
      unsigned char *fonts;
      long inpos, nexthdr;

      j = fread(&CPEntryHeader, 1, sizeof(CPEntryHeader), in);
      if (j != sizeof(CPEntryHeader)) {
          printf("error reading CPEntryHeader - got %d chars\n", j);
          exit(1);
      }
      if (optL) {
          int t = CPEntryHeader.device_type;
          printf("CPEntryHeader: size=%d dev=%d [%s] name=%8.8s \
codepage=%d\n\t\tres=%6.6s nxt=%ld off_font=%ld\n\n",
               CPEntryHeader.size,
               t, (t==1) ? "screen" : (t==2) ? "printer" : "?",
               CPEntryHeader.device_name,
               CPEntryHeader.codepage,
               CPEntryHeader.res,
               CPEntryHeader.off_nexthdr, CPEntryHeader.off_font);
      } else if (optl) {
          printf("\nCodepage = %d\n", CPEntryHeader.codepage);
          printf("Device = %.8s\n", CPEntryHeader.device_name);
      }
#if 0
      if (CPEntryHeader.size != sizeof(CPEntryHeader)) {
          /* seen 26 and 28, so that the difference below is -2 or 0 */
          if (optl)
            printf("Skipping %d bytes of garbage\n",
                 CPEntryHeader.size - sizeof(CPEntryHeader));
          fseek(in, CPEntryHeader.size - sizeof(CPEntryHeader),
              SEEK_CUR);
      }
#endif
      if (!opta && (!optx || CPEntryHeader.codepage != codepage) && !optc)
        goto next;

      inpos = ftell(in);
      if (inpos != CPEntryHeader.off_font && !optc) {
          if (optL)
            printf("pos=%ld font at %ld\n", inpos, CPEntryHeader.off_font);
          fseek(in, CPEntryHeader.off_font, SEEK_SET);
      }

      j = fread(&CPInfoHeader, 1, sizeof(CPInfoHeader), in);
      if (j != sizeof(CPInfoHeader)) {
          printf("error reading CPInfoHeader - got %d chars\n", j);
          exit(1);
      }
      if (optl) {
          printf("Number of Fonts = %d\n", CPInfoHeader.num_fonts);
          printf("Size of Bitmap = %d\n", CPInfoHeader.size);
      }
      if (CPInfoHeader.num_fonts == 0)
        goto next;
      if (optc)
        return 0;

      sprintf(outfile, "%d.cp", CPEntryHeader.codepage);
      if ((out = fopen(outfile, "w")) == NULL) {
          printf("\nUnable to open file %s.\n", outfile);
          exit(1);            
      } else printf("\nWriting %s\n", outfile);

      fonts = (unsigned char *) malloc(CPInfoHeader.size);
            
      fread(fonts, CPInfoHeader.size, 1, in);
      fwrite(&CPEntryHeader, sizeof(CPEntryHeader), 1, out);
      fwrite(&CPInfoHeader, sizeof(CPInfoHeader), 1, out);
      j = fwrite(fonts, 1, CPInfoHeader.size, out);
      if (j != CPInfoHeader.size) {
          printf("error writing %s - wrote %d chars\n", outfile, j);
          exit(1);
      }
      fclose(out);
      free(fonts);
      if (optx) exit(0);
      next:
      /*
       * It seems that if entry headers and fonts are interspersed,
       * then nexthdr will point past the font, regardless of
       * whether more entries follow.
       * Otherwise, first all entry headers are given, and then
       * all fonts; in this case nexthdr will be 0 in the last entry.
       */
      nexthdr = CPEntryHeader.off_nexthdr;
      if (nexthdr == 0 || nexthdr == -1) {
          if (more_to_come) {
            printf("more codepages expected, but nexthdr=%ld\n",
                   nexthdr);
            exit(1);
          } else
              return 1;
      }

      inpos = ftell(in);
      if (inpos != CPEntryHeader.off_nexthdr) {
          if (optL)
            printf("pos=%ld nexthdr at %ld\n", inpos, nexthdr);
          if (opta && !more_to_come) {
            printf("no more code pages, but nexthdr != 0\n");
            return 1;
          }

          fseek(in, CPEntryHeader.off_nexthdr, SEEK_SET);
      }

      return 0;
}

void usage(void)
{
      printf("\nUsage: cpi code_page_file [-c] [-L] [-l] [-a|nnn]\n");
      printf(" -c: input file is a single codepage\n");
      printf(" -L: print header info (you don't want to see this)\n");
      printf(" -l or no option: list all codepages contained in the file\n");
      printf(" -a: extract all codepages from the file\n");
      printf(" nnn (3 digits): extract codepage nnn from the file\n");
      printf("Example: cpi ega.cpi 850 \n");
      printf(" will create a file 850.cp containing the requested codepage.\n\n");
      exit(1);
}

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