cid_aread.c

/*
  cid_aread -- read ACID files
  Copyright (C) 1999 Dieter Baron

  This file is part of ttftot42, to use TrueType fonts in PostScript.
  The author can be contacted at <dillo@giga.or.at>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.
  3. The name of the author may not be used to endorse or promote
     products derived from this software without specific prior
     written permission.
 
  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/



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

#include "t42.h"
#include "cid.h"
#include "pideid.h"

#define GET_TOKEN()	(p=strtok(NULL, " \t\n"),\
			 (p==NULL ? error("command %s missing argument", b),0\
                                  : 0))

enum state {
    ST_BEGIN,	/* before StartCID */
    ST_CID,	/* inside Start(End)CID */
    ST_CMAPS,	/* inside Start(End)Charmaps */
    ST_CMAP,	/* inside Start(End)Charmap */
    ST_ENC,	/* inside Start(End)Encoding */
    ST_END	/* after EndCID */
};

void cid_encode_init(struct cid_code *code);
int cid_encode(struct cid_code *code, char *line);
void cid_encode_flush(struct cid_code *code);


static int lineno;
static char *filename;

static void error(char *fmt, ...);
static void warning(char *fmt, ...);

static int make_tag(unsigned char *tag);

static void grow(struct cid_code *code, int idx);
static void store_cmd(struct cid_code *code, int cmd);
static void store_arg(struct cid_code *code, int arg);



struct cid *
cid_aread(char *fname)
{
    FILE *f;
    struct cid *cid;
    struct cid_cmap *cmap;
    struct cid_feature *feature;
    enum state state;
    char b[8192], *cmd, *p, *q;
    int i, j;
    int ccmap, ncmap, garbage, enc, ma, mi, next_cid;

    if ((f=fopen(fname, "r")) == NULL) {
	/* error: can't open file */
	return NULL;
    }

    filename = fname;

    state = ST_BEGIN;
    garbage = enc = 0;
    ccmap = ncmap = 0;

    while (fgets(b, 8192, f)) {
	lineno++;
	cmd = strtok(b, " \t\n");
	if (cmd == NULL)
	    continue;
	if (state != ST_BEGIN && strcmp(cmd, "Comment") == 0)
	    continue;

	switch (state) {
	case ST_BEGIN:
	    if (strcmp(cmd, "StartCID") == 0) {
		GET_TOKEN();
		ma = strtol(p, &q, 10);
		if (*q != '.') {
		    error("malformed version number");
		    return NULL;
		}
		mi = strtol(q+1, &p, 10);
		if (*p != '\0') {
		    error("malformed version number");
		    return NULL;
		}

		if (ma != 1) {
		    error("major version incompatibility (%d > 1)", ma);
		    return NULL;
		}
		if (mi != 0)
		    warning("minor version incompatibility (%d > 0)", mi);

		cid = cid_new();
		cid->v_major = 1;
		cid->v_minor = 0;

		state = ST_CID;
	    }
	    else {
		error("not a ACID file");
		return NULL;
	    }
	    break;
		
	case ST_CID:
	    if (strcmp(cmd, "Registry") == 0) {
		GET_TOKEN();
		cid->registry = strdup(p);
	    }
	    else if (strcmp(cmd, "Ordering") == 0) {
		GET_TOKEN();
		cid->ordering = strdup(p);
	    }
	    else if (strcmp(cmd, "Supplements") == 0) {
		GET_TOKEN();
		cid->supplement = atoi(p);
		cid->nsupl = cid->supplement+1;
		cid->supl_ncid = (int *)xmalloc(sizeof(int)*cid->nsupl);

		for (i=0; i<cid->nsupl; i++) {
		    GET_TOKEN();
		    cid->supl_ncid[i] = atoi(p);
		}
	    }
	    else if (strcmp(cmd, "StartCharmaps") == 0) {
		if (ncmap) {
		    error("multiple Charmaps sections");
		    cid_free(cid);
		    return NULL;
		}
		GET_TOKEN();
		ncmap = atoi(p);
		if (ncmap == 0) {
		    error("at least one Charmap required");
		    cid_free(cid);
		    return NULL;
		}
		cid->cmap = (struct cid_cmap *)xmalloc(sizeof(struct cid_cmap)
						       * ncmap);

		state = ST_CMAPS;
	    }
	    else if (strcmp(cmd, "StartEncoding") == 0) {
		if (ncmap == 0) {
		    error("Charmaps section required before Encoding section");
		    cid_free(cid);
		    return NULL;
		}
		if (enc) {
		    error("multiple Encoding sections");
		    cid_free(cid);
		    return NULL;
		}
		enc = 1;

		for (i=0; i<cid->ncmap; i++)
		    cid_encode_init(cid->cmap[i].code);
		next_cid = 0;
		
		state = ST_ENC;
	    }
	    else if (strcmp(cmd, "EndCID") == 0) {
		if (ncmap == 0) {
		    error("Charmaps section missing");
		    cid_free(cid);
		    return NULL;
		}
		if (enc == 0) {
		    error("Encoding section missing");
		    cid_free(cid);
		    return NULL;
		}

		state = ST_END;
	    }
	    else
		warning("unknown keyword `%s' ignored\n", cmd);

	    break;

	case ST_CMAPS:
	    if (strcmp(cmd, "StartCharmap") == 0) {
		if (ccmap >= ncmap) {
		    cid->cmap
			= (struct cid_cmap *)xrealloc(cid->cmap,
						      (sizeof(struct cid_cmap)
						       * ccmap+1));
		}
		cid->ncmap++;
		cmap = cid->cmap+ccmap;
		GET_TOKEN();
		cmap->pid = otf_str2pid(p);
		if (cmap->pid == -1)
		    warning("unknown Platform ID `%s', Charmap ignored", p);
		GET_TOKEN();
		cmap->eid = otf_str2eid(cmap->pid, p);
		if (cmap->eid == -1)
		    warning("unknown Encoding ID `%s', Charmap ignored", p);
		cmap->nvert = cmap->nfeature = 0;
		cmap->vert = cmap->feature = NULL;
		cmap->code = cid_code_new();

		state = ST_CMAP;
	    }
	    else if (strcmp(cmd, "EndCharmaps") == 0) {
		if (cid->ncmap < ncmap)
		    warning("%d Charmaps declared but only %d defined\n",
			    ncmap, ccmap);
		if (cid->ncmap > ncmap)
		    warning("only %d Charmaps declared but %d defined\n",
			    ncmap, ccmap);
		
		state = ST_CID;
	    }
	    else
		warning("unknown keyword `%s' ignored (inside Charmaps)", cmd);

	    break;

	case ST_CMAP:
	    if ((strcmp(cmd, "Vertical") == 0
		 || strcmp(cmd, "Feature") == 0)) {
		if (strcmp(cmd, "Vertical") == 0) {
		    cmap->vert
			= ((struct cid_feature *)
			   xrealloc(cmap->vert, (sizeof(struct cid_feature)
						    * (cmap->nvert+1))));
		    feature = cmap->vert+cmap->nvert;
		    cmap->nvert++;
		}
		else {
		    cmap->feature
			= ((struct cid_feature *)
			   xrealloc(cmap->feature, (sizeof(struct cid_feature)
						    * (cmap->nfeature+1))));
		    feature = cmap->feature+cmap->nfeature;
		    cmap->nfeature++;
		}
		GET_TOKEN();
		feature->script = make_tag(p);
		GET_TOKEN();
		feature->language = make_tag(p);
		GET_TOKEN();
		feature->feature = make_tag(p);
	    }
	    else if (strcmp(cmd, "EndCharmap") == 0) {
		ccmap++;

		state = ST_CMAPS;
	    }
	    else
		warning("unknown keyword `%s' ignored (inside Charmap)", cmd);
	    break;

	case ST_ENC:
	    if (strcmp(cmd, "CID") == 0) {
		GET_TOKEN();
		/* allow for missing cid values (treat as `*') */
		i = atoi(p);
		while (next_cid < i) {
		    for (j=0; j<cid->ncmap; j++)
			cid_encode(cid->cmap[i].code, "*");
		    next_cid++;
		}
		next_cid = i+1;
		
		for (i=0; i<cid->ncmap; i++) {
		    GET_TOKEN();
		    cid_encode(cid->cmap[i].code, p);
		}
	    }
	    else if (strcmp(cmd, "EndEncoding") == 0) {
		for (i=0; i<cid->ncmap; i++)
		    cid_encode_flush(cid->cmap[i].code);

		state = ST_CID;
	    }
	    else
		warning("unknown keyword `%s' ignored (inside Encoding)", cmd);

	    break;

	case ST_END:
	    if (!garbage) {
		warning("garbage after EndCID ignored");
		garbage = 1;
	    }
	}
    }

    fclose(f);

    /* XXX: post processing (check pid/eid) , state == ST_END */

    return cid;
}



void
cid_encode_init(struct cid_code *code)
{
    code->size = code->ndata = 0;
    code->nchar = 0;
    code->data = NULL;

    code->cmd = C_none;
    code->idx = 0;
    code->len = 0;
}



int
cid_encode(struct cid_code *code, char *line)
{
    int vvec, vtype, len, bit, v, vert;
    char *q;

    if (line[0] == '*') {
	if (code->cmd != C_N || code->len >= 0x1fff) {
	    cid_encode_flush(code);
	    code->cmd = C_N;
	}
	code->len++;
    }
    else if (strchr(line, ',')) {
	cid_encode_flush(code);
	vvec = vtype = len = 0;
	bit = 1;
	while (line) {
	    v = strtol(line, &q, 16);
	    vert = (*q == 'v');
	    store_arg(code, v);
	    if (vert) {
		vvec |= bit;
		vtype |= 2;
	    }
	    else
		vtype |= 1;
	    
	    bit <<= 1;
	    if ((line = strchr(line, ',')))
		line++;
	}

	switch (vtype) {
	case 1:
	    store_cmd(code, C_A);
	    break;
	case 2:
	    store_cmd(code, C_AV);
	    break;
	case 3:
	    if (code->len > 16) {
		warning("mixed alternatives of length > 16 can't be encoded, "
			"rest dropped");
		code->len = 16;
	    }
	    grow(code, code->idx+code->len+2);
	    memmove(code->data+code->idx+2, code->data+code->idx+1,
		    code->len*sizeof(short));
	    code->data[code->idx+1] = vvec;
	    store_cmd(code, C_AM);
	    break;
	}
    }
    else {
	v = strtol(line, &q, 16);
	vert = (*q == 'v');

	if ((code->len < 0x1fff
	     && ((vert && code->cmd == C_OV) || (!vert && code->cmd == C_O))
	     && code->data[code->idx+1]+code->len == v)) {
	    code->len++;
	}
	else if ((code->len >= 0x1fff
		  || (vert && code->cmd != C_LV)
		  || (!vert && code->cmd != C_L))) {
	    cid_encode_flush(code);
	    code->cmd = vert ? C_LV : C_L;
	    store_arg(code, v);
	}
	else if ((code->len > 1
		  && code->data[code->idx+code->len] == v-1
		  && code->data[code->idx+code->len-1] == v-2)) {
	    code->len -= 2;
	    if (code->len)
		cid_encode_flush(code);
	    code->cmd = vert ? C_OV : C_O;
	    store_arg(code, v-2);
	    code->len = 3;
	}
	else
	    store_arg(code, v);
    }

    return 0;
}



void
cid_encode_flush(struct cid_code *code)
{
    if (code->cmd != C_none)
	store_cmd(code, code->cmd);
}



static void
store_arg(struct cid_code *code, int arg)
{
    int idx;

    code->len++;
    idx = code->idx + code->len;

    grow(code, idx);

    code->data[idx] = arg;
}



static void
store_cmd(struct cid_code *code, int cmd)
{
    grow(code, code->idx);

    code->data[code->idx] = cmd | code->len;
    
    switch(cmd) {
    case C_N:
	code->idx += 1;
	break;

    case C_O:
    case C_OV:
	code->idx += 2;
	break;

    case C_L:
    case C_LV:
    case C_A:
    case C_AV:
	code->idx += code->len + 1;
	break;

    case C_AM:
	code->idx += code->len + 2;
	break;
    }

    code->len =  0;
    code->ndata = code->idx;
    code->cmd = C_none;
}



static void
grow(struct cid_code *code, int idx)
{
    if (idx >= code->size) {
	code->size += 1024;
	code->data = (unsigned short *)xrealloc(code->data,
						sizeof(unsigned short *)
						* code->size);
    }
}



static int
make_tag(unsigned char *tag)
{
    int l;

    l = strlen(tag);

    return (((l>0 ? tag[0] : ' ') << 24)
	    + ((l>1 ? tag[1] : ' ') << 16)
	    + ((l>2 ? tag[2] : ' ') << 8)
	    + (l>3 ? tag[3] : ' '));
}



static void
error(char *fmt, ...)
{
    va_list va;

    fprintf(stderr, "%s: %s:%d: ", prg, filename, lineno);

    va_start(va, fmt);
    vfprintf(stderr, fmt, va);
    va_end(va);

    putc('\n', stderr);
}



static void
warning(char *fmt, ...)
{
    va_list va;

    fprintf(stderr, "%s: %s:%d: warning: ", prg, filename, lineno);

    va_start(va, fmt);
    vfprintf(stderr, fmt, va);
    va_end(va);

    putc('\n', stderr);
}