/*
* Fix the Netscape executable for specified font widths
*
* (c) 1999 Copyright by Sergey Babkin
* see COPYRIGHT
*/
#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <locale.h>
#include <unistd.h>
/************************** DEFINES *************************/
#undef DEBUG
/* we can handle at most this many fonts */
#define MAXFONTS 20
/* maximal line buffer size */
#define MAXLINE 512
/* there may be multiple strings with the same contents */
#define MAXDUPS 10
/* file read buffer size */
#define FILEBF 40960
/* bits in the hardware page offset */
#define BITSPERPAGE 12
/* size of page in bytes */
#define PAGESIZE (1<<BITSPERPAGE)
/* mask of the in-page offset */
#define PAGEMASK (PAGESIZE-1)
/* this is machine-dependent! */
typedef short t2b; /* 2-byte type */
typedef int t4b; /* 4-byte type */
typedef int tptr; /* integer type with the same size as pointer */
struct bbox { /* bounding box */
t2b llx; /* lower-left-x */
t2b lly;
t2b urx;
t2b ury; /* upper-right-y */
};
struct glyphmetrics { /* metrics of one glyph */
t2b width;
t2b unknown;
struct bbox bbox;
};
struct fontmetrics { /* metrics of the wholefont */
tptr name;
struct bbox bbox;
t2b underlinepos;
t2b underlinethick;
struct glyphmetrics glyphs[256];
};
struct font {
char nsname[MAXLINE]; /* name in the Netscape binary */
char afmname[MAXLINE]; /* name of the .afm file */
char pfaname[MAXLINE]; /* name of the .pfa (or .pfb) file */
struct fontmetrics metrics;
off_t binoff; /* offset in the binary */
};
#define SCONST(x) (x), ((sizeof (x))-1)
/************************** GLOBALS *************************/
struct font font[MAXFONTS];
int nfonts=0;
char msg[MAXLINE];
/*************************** PROTOTYPES **********************/
void usage(void);
void readconfig( char *fn);
void readmetrics(void);
void replacefonts( char *fn);
/************************** main ****************************/
main(ac, av)
int ac;
char **av;
{
setlocale(LC_ALL, "");
if(ac!=3) {
usage(); exit(1);
}
readconfig(av[2]);
readmetrics();
replacefonts( av[1]);
}
/************************** usage ***************************/
void
usage(void)
{
fprintf(stderr,"Use:\n");
fprintf(stderr," nsfix <netscape.bin> <config-file>\n");
}
/************************** readconfig **********************/
void
readconfig(fn)
char *fn;
{
char s[MAXLINE];
char afmsuffix[MAXLINE], pfasuffix[MAXLINE];
int lineno=0;
FILE *f;
if(( f=fopen(fn, "r") )==NULL) {
sprintf(msg,"nsfix: open %s",fn);
perror(msg);
exit(1);
}
while( fgets(s, MAXLINE, f) ) {
lineno++;
if(s[0]=='#' || s[0]=='\n')
continue;
if(nfonts>=MAXFONTS) {
fprintf(stderr, "nsfix: only %d fonts are supported at once\n",
MAXFONTS);
exit(1);
}
if( sscanf(s, "%s %s %s %s", font[nfonts].nsname,
font[nfonts].afmname, afmsuffix, pfasuffix) != 4 ) {
fprintf(stderr, "nsfix: syntax error at line %d of %s\n",
lineno, fn);
exit(1);
}
strcpy(font[nfonts].pfaname, font[nfonts].afmname);
strcat(font[nfonts].afmname, afmsuffix);
strcat(font[nfonts].pfaname, pfasuffix);
nfonts++;
}
if(nfonts==0) {
fprintf(stderr, "nsfix: no fonts are defined in %s\n", fn);
exit(1);
}
fclose(f);
}
/************************** readmetrics *********************/
void
readmetrics(void)
{
int i;
char s[MAXLINE];
FILE *f;
int n;
int lineno;
int code, width, llx, lly, urx, ury;
char gn[MAXLINE];
struct glyphmetrics *gm;
for(i=0; i<nfonts; i++) {
if(( f=fopen(font[i].afmname, "r") )==NULL) {
sprintf(msg,"nsfix: open %s", font[i].afmname);
perror(msg);
exit(1);
}
lineno=0;
while( fgets(s, MAXLINE, f) ) {
lineno++;
if( !strncmp(s, SCONST("UnderlineThickness ")) ) {
if( sscanf(s, "UnderlineThickness %d", &n) <1) {
fprintf(stderr, "nsfix: weird UnderlineThickness at line %d in %s\n",
lineno, font[i].afmname);
exit(1);
}
font[i].metrics.underlinethick=n;
} else if( !strncmp(s, SCONST("UnderlinePosition ")) ) {
if( sscanf(s, "UnderlinePosition %d", &n) <1) {
fprintf(stderr, "nsfix: weird UnderlinePosition at line %d in %s\n",
lineno, font[i].afmname);
exit(1);
}
font[i].metrics.underlinepos=n;
} else if( !strncmp(s, SCONST("FontBBox ")) ) {
if( sscanf(s, "FontBBox %d %d %d %d", &llx, &lly, &urx, &ury) <4) {
fprintf(stderr, "nsfix: weird FontBBox at line %d in %s\n",
lineno, font[i].afmname);
exit(1);
}
font[i].metrics.bbox.llx=llx;
font[i].metrics.bbox.lly=lly;
font[i].metrics.bbox.urx=urx;
font[i].metrics.bbox.ury=ury;
} else if( !strncmp(s, SCONST("C ")) ) {
if( sscanf(s, "C %d ; WX %d ; N %s ; B %d %d %d %d",
&code, &width, &gn, &llx, &lly, &urx, &ury) <7)
{
fprintf(stderr, "nsfix: weird metrics at line %d in %s\n",
lineno, font[i].afmname);
exit(1);
}
if(code>=32 && code<=255) {
font[i].metrics.glyphs[code].width=width;
font[i].metrics.glyphs[code].bbox.llx=llx;
font[i].metrics.glyphs[code].bbox.lly=lly;
font[i].metrics.glyphs[code].bbox.urx=urx;
font[i].metrics.glyphs[code].bbox.ury=ury;
}
}
}
fclose(f);
}
#ifdef DEBUG
for(i=0; i<nfonts; i++) {
printf("Font %s\n", font[i].nsname);
for(n=0; n<256; n++) {
gm= &font[i].metrics.glyphs[n];
printf(" %d w=%4d [%4d %4d %4d %4d]", n, gm->width,
gm->bbox.llx, gm->bbox.lly, gm->bbox.urx, gm->bbox.ury);
printf(" w=0x%04x [0x%04x 0x%04x 0x%04x 0x%04x]\n", gm->width & 0xffff,
gm->bbox.llx & 0xffff, gm->bbox.lly & 0xffff, gm->bbox.urx & 0xffff, gm->bbox.ury & 0xffff);
}
}
exit(0);
#endif
}
/************************** replacefonts ********************/
void
replacefonts(fn)
char *fn;
{
int f; /* don't use stdio */
char bf[FILEBF];
char *bfend, *p;
int len;
off_t pos;
off_t zerooff[MAXFONTS*MAXDUPS]; /* offset of zero strings */
tptr nameaddr[MAXFONTS*MAXDUPS]; /* name pointers before these zero strings */
int zeroid[MAXFONTS*MAXDUPS]; /* font number for this zero block */
int nzeroes;
short matched[MAXFONTS]; /* counters how many matches we have for each requested font */
struct fontmetrics *fp;
struct {
int noff;
int nz;
off_t off[MAXDUPS]; /* there may be multiple strings with the same contents */
} o[MAXFONTS];
int maxnlen;
int i, j, k, n;
static struct glyphmetrics gm[32]; /* 0-initialized */
if(( f=open(fn, O_RDWR) )<0) {
sprintf(msg,"nsfix: open %s",fn);
perror(msg);
exit(1);
}
/* get the maximal font name length */
maxnlen=0;
for(i=0; i<nfonts; i++) {
o[i].noff=o[i].nz=0;
matched[i]=0;
len=strlen(font[i].nsname)+1;
if(len>maxnlen)
maxnlen=len;
}
/* fprintf(stderr,"maxnlen= 0x%x\n", maxnlen); /* */
/* try to find the literal strings of the font names */
pos=0; bfend=bf;
while(( len=read(f, bfend, FILEBF-(bfend-bf)) )>=0 ) {
/* fprintf(stderr,"looking at 0x%lx\n", (long)pos); /* */
/* the last position to check */
if(len>=maxnlen)
/* leave the rest with the next block */
bfend+= len-maxnlen;
else {
/* we are very near to the end of file, check
* up to the very last byte */
bfend+= len-2;
memset(bfend+2, 0, maxnlen);
}
for(p=bf; p<=bfend; p++)
for(i=0; i<nfonts; i++)
if(!strcmp(font[i].nsname, p) && o[i].noff<MAXDUPS) {
o[i].off[ o[i].noff++ ] = pos + (p-bf);
fprintf(stderr,"found %s at 0x%lx\n", font[i].nsname, (long)pos + (p-bf));
}
if(len==0)
break;
memmove(bf, bfend, maxnlen);
pos+= (bfend-bf);
bfend= (bf+maxnlen);
}
if(len<0) {
sprintf(msg,"nsfix: read %s",fn);
perror(msg);
exit(1);
}
fprintf(stderr,"---\n");
/* if there are any dups try to resolve them */
for(i=0; i<nfonts; i++) {
if(o[i].noff==0) {
fprintf(stderr, "nsfix: font %s (%d of %d) is missing in %s\n",
font[i].nsname, i, nfonts, fn);
exit(1);
}
if(o[i].noff!=1)
continue;
/* good, only one entry */
fprintf(stderr,"found unique %s at 0x%lx\n", font[i].nsname, (long)o[i].off[0] );
/* if any dupped entry is right after this one then it's good */
/* if it's farther than PAGESIZE/2 then it's bad */
pos=o[i].off[0]+strlen(font[i].nsname)+1;
for(j=0; j<MAXFONTS; j++) {
if(o[j].noff<=1)
continue;
for(k=0; k<o[j].noff; k++) {
if(o[j].off[k]==pos) { /* good */
fprintf(stderr,"got unique %s at 0x%lx\n", font[j].nsname, (long)pos );
o[j].off[0]=pos;
o[j].noff=1;
break;
}
if(o[j].off[k] < pos - PAGESIZE/2
|| o[j].off[k] > pos + PAGESIZE/2) { /* bad */
fprintf(stderr, "eliminated %s at 0x%lx\n", font[j].nsname, (long)o[j].off[k] );
for(n=k+1; n<o[j].noff; n++)
o[j].off[n-1]=o[j].off[n];
o[j].noff--;
k--;
}
}
if(o[j].noff==1 && j<i) { /* have to revisit this font */
i=j-1; /* compensate for i++ */
break;
}
}
}
/* try to find the metric tables in the executable */
if(lseek(f, (off_t)0, SEEK_SET)<0) {
sprintf(msg,"nsfix: rewind %s",fn);
perror(msg);
exit(1);
}
/*
* search for the zeroes in place of the metrics for the codes 0-31:
* 4-byte aligned strings of (32*sizeof(struct glyphmetrics)) zero bytes
*/
maxnlen=sizeof(struct fontmetrics);
pos=0; bfend=bf; nzeroes=0;
while(( len=read(f, bfend, FILEBF-(bfend-bf)) )>=0 ) {
/* fprintf(stderr,"looking at 0x%lx\n", (long)pos); /* */
/* the last position to check */
bfend+= len-maxnlen; /* don't look beyond the EOF */
for(p=bf; p<=bfend; p+=4 /* 4-byte aligned */ ) {
fp=(struct fontmetrics *)p;
if(fp->name==0)
continue;
if( memcmp(gm, fp->glyphs, sizeof gm) )
continue;
/* OK, looks like it, see if we can match it to any name */
n= fp->name & PAGEMASK;
for(i=0; i<nfonts; i++) {
for(j=0; j<o[i].noff; j++)
if( n==(o[i].off[j] & PAGEMASK) ) {
zerooff[nzeroes]= pos + (p-bf);
nameaddr[nzeroes]= fp->name;
zeroid[nzeroes]=i;
o[i].nz++;
fprintf(stderr, "matched %s at 0x%lx\n",
font[i].nsname, (long) zerooff[nzeroes]);
nzeroes++;
matched[i]++;
break;
}
}
}
if(len==0)
break;
memmove(bf, bfend, maxnlen);
pos+= (bfend-bf);
bfend= (bf+maxnlen);
}
if(len<0) {
sprintf(msg,"nsfix: read %s",fn);
perror(msg);
exit(1);
}
fprintf(stderr,"---\n");
/* make sure that all the fonts got one match */
k=0; /* flag: have non-matched fonts */ n=0; /* flag: have ambiguities */
for(i=0; i<nfonts; i++)
if(matched[i]==0)
k=1;
else if(matched[i]>1)
n=1;
if(k) {
fprintf(stderr,"nsfix: can't find match for some of the fonts\n");
fprintf(stderr,"nsfix: maybe wrong byte order, aborting\n");
exit(1);
}
if(n) {
fprintf(stderr,"nsfix: got multiple matches for some of the fonts\n");
fprintf(stderr,"nsfix: can't resolve, aborting\n");
exit(1);
}
/* now finally write the updated tables */
for(i=0; i<nzeroes; i++) {
j=zeroid[i];
fprintf(stderr, "nsfix: writing table for %s at 0x%lx\n", font[j].nsname,
(long)zerooff[i]);
font[j].metrics.name=nameaddr[i];
if( lseek(f, zerooff[i], SEEK_SET)<0 ) {
sprintf(msg,"nsfix: seek %s to 0x%lx",fn, (long)zerooff[i] );
perror(msg);
exit(1);
}
if( write(f, &font[j].metrics, sizeof font[j].metrics) != sizeof font[j].metrics ) {
sprintf(msg,"nsfix: write to %s",fn );
perror(msg);
exit(1);
}
}
close(f);
}
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