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gecko-dev/lib/xlate/parseAFM.c
akkana%netscape.com 472079af6c Eliminate a bunch of warnings
1998-09-28 19:06:17 +00:00

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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* (C) 1988, 1989, 1990 by Adobe Systems Incorporated. All rights reserved.
*
* This file may be freely copied and redistributed as long as:
* 1) This entire notice continues to be included in the file,
* 2) If the file has been modified in any way, a notice of such
* modification is conspicuously indicated.
*
* PostScript, Display PostScript, and Adobe are registered trademarks of
* Adobe Systems Incorporated.
*
* ************************************************************************
* THE INFORMATION BELOW IS FURNISHED AS IS, IS SUBJECT TO CHANGE WITHOUT
* NOTICE, AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ADOBE SYSTEMS
* INCORPORATED. ADOBE SYSTEMS INCORPORATED ASSUMES NO RESPONSIBILITY OR
* LIABILITY FOR ANY ERRORS OR INACCURACIES, MAKES NO WARRANTY OF ANY
* KIND (EXPRESS, IMPLIED OR STATUTORY) WITH RESPECT TO THIS INFORMATION,
* AND EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR PARTICULAR PURPOSES AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
* ************************************************************************
*/
/* parseAFM.c
*
* This file is used in conjuction with the parseAFM.h header file.
* This file contains several procedures that are used to parse AFM
* files. It is intended to work with an application program that needs
* font metric information. The program can be used as is by making a
* procedure call to "parseFile" (passing in the expected parameters)
* and having it fill in a data structure with the data from the
* AFM file, or an application developer may wish to customize this
* code.
*
* There is also a file, parseAFMclient.c, that is a sample application
* showing how to call the "parseFile" procedure and how to use the data
* after "parseFile" has returned.
*
* Please read the comments in parseAFM.h and parseAFMclient.c.
*
* History:
* original: DSM Thu Oct 20 17:39:59 PDT 1988
* modified: DSM Mon Jul 3 14:17:50 PDT 1989
* - added 'storageProblem' return code
* - fixed bug of not allocating extra byte for string duplication
* - fixed typos
* modified: DSM Tue Apr 3 11:18:34 PDT 1990
* - added free(ident) at end of parseFile routine
* modified: DSM Tue Jun 19 10:16:29 PDT 1990
* - changed (width == 250) to (width = 250) in initializeArray
* modified: liuhai Wed Jun 11 13:53:35 PDT 1997
* - customized for Netscape's runtime AFM file parsing
* - only 'necessary' parsings are kept, others were thrown away
* - PS_FontInfo is used instead of FontInfo
*/
/*
* Mozilla modifications:
* - Include xlate_i.h for PS_FontInfo struct definition.
* - Minor compiler warning cleanup.
*/
#include "xlate_i.h"
#include <errno.h>
#include <sys/file.h>
#include <math.h>
#include "parseAFM.h"
/*
#include "sunos.h"
*/
#define lineterm EOL /* line terminating character */
#define normalEOF 1 /* return code from parsing routines used only */
/* in this module */
#define Space "space" /* used in string comparison to look for the width */
/* of the space character to init the widths array */
#define False "false" /* used in string comparison to check the value of */
/* boolean keys (e.g. IsFixedPitch) */
#define MATCH(A,B) (strncmp((A),(B), MAX_NAME) == 0)
/*************************** GLOBALS ***********************/
static char *ident = NULL; /* storage buffer for keywords */
/* "shorts" for fast case statement
* The values of each of these enumerated items correspond to an entry in the
* table of strings defined below. Therefore, if you add a new string as
* new keyword into the keyStrings table, you must also add a corresponding
* parseKey AND it MUST be in the same position!
*
* IMPORTANT: since the sorting algorithm is a binary search, the strings of
* keywords must be placed in lexicographical order, below. [Therefore, the
* enumerated items are not necessarily in lexicographical order, depending
* on the name chosen. BUT, they must be placed in the same position as the
* corresponding key string.] The NOPE shall remain in the last position,
* since it does not correspond to any key string, and it is used in the
* "recognize" procedure to calculate how many possible keys there are.
*/
static enum parseKey {
ASCENDER, CHARBBOX, CODE, COMPCHAR, CAPHEIGHT, COMMENT,
DESCENDER, ENCODINGSCHEME, ENDCHARMETRICS, ENDCOMPOSITES,
ENDFONTMETRICS, ENDKERNDATA, ENDKERNPAIRS, ENDTRACKKERN,
FAMILYNAME, FONTBBOX, FONTNAME, FULLNAME, ISFIXEDPITCH,
ITALICANGLE, KERNPAIR, KERNPAIRXAMT, LIGATURE, CHARNAME,
NOTICE, COMPCHARPIECE, STARTCHARMETRICS, STARTCOMPOSITES,
STARTFONTMETRICS, STARTKERNDATA, STARTKERNPAIRS,
STARTTRACKKERN, TRACKKERN, UNDERLINEPOSITION,
UNDERLINETHICKNESS, VERSION, XYWIDTH, XWIDTH, WEIGHT, XHEIGHT,
NOPE };
/* keywords for the system:
* This a table of all of the current strings that are vaild AFM keys.
* Each entry can be referenced by the appropriate parseKey value (an
* enumerated data type defined above). If you add a new keyword here,
* a corresponding parseKey MUST be added to the enumerated data type
* defined above, AND it MUST be added in the same position as the
* string is in this table.
*
* IMPORTANT: since the sorting algorithm is a binary search, the keywords
* must be placed in lexicographical order. And, NULL should remain at the
* end.
*/
static char *keyStrings[] = {
"Ascender", "B", "C", "CC", "CapHeight", "Comment",
"Descender", "EncodingScheme", "EndCharMetrics", "EndComposites",
"EndFontMetrics", "EndKernData", "EndKernPairs", "EndTrackKern",
"FamilyName", "FontBBox", "FontName", "FullName", "IsFixedPitch",
"ItalicAngle", "KP", "KPX", "L", "N",
"Notice", "PCC", "StartCharMetrics", "StartComposites",
"StartFontMetrics", "StartKernData", "StartKernPairs",
"StartTrackKern", "TrackKern", "UnderlinePosition",
"UnderlineThickness", "Version", "W", "WX", "Weight", "XHeight",
NULL };
/*************************** PARSING ROUTINES **************/
/*************************** token *************************/
/* A "AFM File Conventions" tokenizer. That means that it will
* return the next token delimited by white space. See also
* the `linetoken' routine, which does a similar thing but
* reads all tokens until the next end-of-line.
*/
static char *token(FILE *stream)
{
int ch, idx;
/* skip over white space */
while ((ch = fgetc(stream)) == ' ' || ch == lineterm ||
ch == ',' || ch == '\t' || ch == ';');
idx = 0;
while (ch != EOF && ch != ' ' && ch != lineterm
&& ch != '\t' && ch != ':' && ch != ';')
{
ident[idx++] = ch;
ch = fgetc(stream);
} /* while */
if (ch == EOF && idx < 1) return ((char *)NULL);
if (idx >= 1 && ch != ':' ) ungetc(ch, stream);
if (idx < 1 ) ident[idx++] = ch; /* single-character token */
ident[idx] = 0;
return(ident); /* returns pointer to the token */
} /* token */
/*************************** linetoken *************************/
/* "linetoken" will get read all tokens until the EOL character from
* the given stream. This is used to get any arguments that can be
* more than one word (like Comment lines and FullName).
*/
static char *linetoken(FILE *stream)
{
int ch, idx;
while ((ch = fgetc(stream)) == ' ' || ch == '\t' );
idx = 0;
while (ch != EOF && ch != lineterm)
{
ident[idx++] = ch;
ch = fgetc(stream);
} /* while */
ungetc(ch, stream);
ident[idx] = 0;
return(ident); /* returns pointer to the token */
} /* linetoken */
/*************************** recognize *************************/
/* This function tries to match a string to a known list of
* valid AFM entries (check the keyStrings array above).
* "ident" contains everything from white space through the
* next space, tab, or ":" character.
*
* The algorithm is a standard Knuth binary search.
*/
static enum parseKey recognize(register char *ident)
{
int lower = 0, upper = (int) NOPE, midpoint, cmpvalue;
BOOL found = FALSE;
while ((upper >= lower) && !found)
{
midpoint = (lower + upper)/2;
if (keyStrings[midpoint] == NULL) break;
cmpvalue = strncmp(ident, keyStrings[midpoint], MAX_NAME);
if (cmpvalue == 0) found = TRUE;
else if (cmpvalue < 0) upper = midpoint - 1;
else lower = midpoint + 1;
} /* while */
if (found) return (enum parseKey) midpoint;
else return NOPE;
} /* recognize */
/************************* parseGlobals *****************************/
static BOOL parseGlobals(FILE *fp, register PS_FontInfo *gfi)
{
BOOL cont = TRUE, save = (gfi != NULL);
int error = ok;
register char *keyword;
while (cont)
{
keyword = token(fp);
if (keyword == NULL)
/* Have reached an early and unexpected EOF. */
/* Set flag and stop parsing */
{
error = earlyEOF;
break; /* get out of loop */
}
if (!save)
/* get tokens until the end of the Global Font info section */
/* without saving any of the data */
switch (recognize(keyword))
{
case STARTCHARMETRICS:
cont = FALSE;
break;
case ENDFONTMETRICS:
cont = FALSE;
error = normalEOF;
break;
default:
break;
} /* switch */
else {
/* otherwise parse entire global font info section, */
/* saving the data */
switch(recognize(keyword))
{
case STARTFONTMETRICS:
keyword = token(fp);
break;
case COMMENT:
keyword = linetoken(fp);
break;
case FONTNAME:
keyword = token(fp);
gfi->name = (char *) malloc(strlen(keyword) + 1);
strcpy(gfi->name, keyword);
break;
case ENCODINGSCHEME:
keyword = token(fp);
break;
case FULLNAME:
keyword = linetoken(fp);
break;
case FAMILYNAME:
keyword = linetoken(fp);
break;
case WEIGHT:
keyword = token(fp);
break;
case ITALICANGLE:
keyword = token(fp);
break;
case ISFIXEDPITCH:
keyword = token(fp);
break;
case UNDERLINEPOSITION:
keyword = token(fp);
gfi->upos = atoi(keyword);
break;
case UNDERLINETHICKNESS:
keyword = token(fp);
gfi->uthick = atoi(keyword);
break;
case VERSION:
keyword = token(fp);
break;
case NOTICE:
keyword = linetoken(fp);
break;
case FONTBBOX:
keyword = token(fp);
gfi->fontBBox.llx = atoi(keyword);
keyword = token(fp);
gfi->fontBBox.lly = atoi(keyword);
keyword = token(fp);
gfi->fontBBox.urx = atoi(keyword);
keyword = token(fp);
gfi->fontBBox.ury = atoi(keyword);
break;
case CAPHEIGHT:
keyword = token(fp);
break;
case XHEIGHT:
keyword = token(fp);
break;
case DESCENDER:
keyword = token(fp);
break;
case ASCENDER:
keyword = token(fp);
break;
case STARTCHARMETRICS:
cont = FALSE;
break;
case ENDFONTMETRICS:
cont = FALSE;
error = normalEOF;
break;
case NOPE:
break;
default:
error = parseError;
break;
} /* switch */
}
} /* while */
return(error);
} /* parseGlobals */
/************************* parseCharMetrics ************************/
static int parseCharMetrics(FILE *fp, register PS_FontInfo *fi)
{
BOOL cont = TRUE;
int error = ok, count = 0, code = 0;
register char *keyword;
while (cont)
{
keyword = token(fp);
if (keyword == NULL)
{
error = earlyEOF;
break; /* get out of loop */
}
switch(recognize(keyword))
{
case COMMENT:
keyword = linetoken(fp);
break;
case CODE:
code = atoi(token(fp));
count++;
break;
case XYWIDTH:
if (code <0 || code >= 256) {
token(fp); token(fp); break;
}
fi->chars[code].wx = atoi(token(fp));
fi->chars[code].wy = atoi(token(fp));
break;
case XWIDTH:
if (code <0 || code >= 256) {
token(fp); break;
}
fi->chars[code].wx = atoi(token(fp));
break;
case CHARNAME:
keyword = token(fp);
break;
case CHARBBOX:
if (code <0 || code >= 256) {
token(fp); token(fp); token(fp); token(fp); break;
}
fi->chars[code].charBBox.llx = atoi(token(fp));
fi->chars[code].charBBox.lly = atoi(token(fp));
fi->chars[code].charBBox.urx = atoi(token(fp));
fi->chars[code].charBBox.ury = atoi(token(fp));
break;
case LIGATURE:
keyword = token(fp);
keyword = token(fp);
break;
case ENDCHARMETRICS:
cont = FALSE;;
break;
case ENDFONTMETRICS:
cont = FALSE;
error = normalEOF;
break;
case NOPE:
break;
default:
error = parseError;
break;
} /* switch */
} /* while */
return(error);
} /* parseCharMetrics */
/*************************** 'PUBLIC' FUNCTION ********************/
/*************************** XP_parseAFMFile *****************************/
/* this is the only 'public' procedure available. It is called
* from an application wishing to get information from an AFM file.
* The caller of this function is responsible for locating and opening
* an AFM file and handling all errors associated with that task.
*
* parseFile returns an error code as defined in parseAFM.h.
*
* The position of the read/write pointer associated with the file
* pointer upon return of this function is undefined.
*/
int XP_parseAFMFile (fp, fi)
FILE *fp;
PS_FontInfo **fi;
{
int code = ok; /* return code from each of the parsing routines */
int error = ok; /* used as the return code from this function */
int i;
register char *keyword; /* used to store a token */
/* storage data for the global variable ident */
ident = (char *) calloc(MAX_NAME, sizeof(char));
if (ident == NULL) {error = storageProblem; return(error);}
if ((*fi) == NULL) (*fi) = (PS_FontInfo *) calloc(1, sizeof(PS_FontInfo));
if ((*fi) == NULL) {error = storageProblem; return(error);}
for (i=0; i<256; i++) { /* initialize the default font width */
(*fi)->chars[i].wx = 250;
}
/* The AFM File begins with Global Font Information. This section */
/* will be parsed whether or not information should be saved. */
code = parseGlobals(fp, (*fi));
/* be liberal to strict AFM grammar. */
if ((code != earlyEOF) && (code < 0)) error = code;
/* The Global Font Information is followed by the Character Metrics */
/* section. */
if ((code != normalEOF) && (code != earlyEOF))
{
token(fp);
code = parseCharMetrics(fp, *fi);
} /* if */
if ((code != earlyEOF) && (code < 0)) error = code;
if (ident != NULL) { free(ident); ident = NULL; }
return(error);
} /* XP_parseAFMFile */
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