[sgt/halibut] / in_pf.c

/*
 * PostScript Type 1 font file support for Halibut
 */
/*
 * Type 1 font file formats are specified by Adobe Technical Note
 * #5040: "Supporting Downloadable PostScript Language Fonts".
 * Halibut supports hexadecimal format (section 3.1) and IBM PC format
 * (section 3.3), commonly called PFA and PFB respectively.
 */

#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include "halibut.h"
#include "paper.h"

#define PFB_ASCII	1
#define PFB_BINARY	2
#define PFB_EOF		3

typedef struct t1_font_Tag t1_font;
typedef struct t1_data_Tag t1_data;

struct t1_font_Tag {
    t1_data *data;
    size_t length1;
    size_t length2;
    filepos pos;
};

struct t1_data_Tag {
    char type;
    size_t length;
    unsigned char *data;
    t1_data *next;
};

typedef struct pfstate_Tag {
    t1_data *data;
    t1_data *curblock;
    size_t offset;
} pfstate;

static void pf_identify(t1_font *tf);

static t1_data *load_pfb_file(FILE *fp, filepos *pos) {
    t1_data *head = NULL, *tail = NULL;
    int c, i;
    char type;

    pos->line = 0;
    for (;;) {
	if (fgetc(fp) != 128) abort();
	type = fgetc(fp);
	if (type == PFB_EOF) return head;
	if (tail) {
	    tail->next = snew(t1_data);
	    tail = tail->next;
	} else {
	    head = snew(t1_data);
	    tail = head;
	}
	tail->type = type;
	tail->length = 0;
	for (i = 0; i < 4; i++) {
	    c = fgetc(fp);
	    if (c == EOF) abort();
	    tail->length |= c << (8 * i);
	}
	tail->data = snewn(tail->length, unsigned char);
	if (fread(tail->data, 1, tail->length, fp) != tail->length) abort();
    }
}

static t1_data *load_pfa_file(FILE *fp, filepos *pos) {
    t1_data *ret = snew(t1_data);
    size_t off = 0, len, got;

    pos->line = 0;
    ret->type = PFB_ASCII;
    len = 32768;
    ret->data = snewn(len, unsigned char);
    for (;;) {
	got = fread(ret->data + off, 1, len - off, fp);
	off += got;
	if (off != len) break;
	len *= 2;
	ret->data = sresize(ret->data, len, unsigned char);
    }
    ret->data = sresize(ret->data, off, unsigned char);
    ret->length = off;
    return ret;
}

void read_pfa_file(input *in) {
    t1_font *tf = snew(t1_font);

    tf->data = load_pfa_file(in->currfp, &in->pos);
    tf->pos = in->pos;
    tf->length1 = tf->length2 = 0;
    fclose(in->currfp);
    pf_identify(tf);
}

void read_pfb_file(input *in) {
    t1_font *tf = snew(t1_font);

    tf->data = load_pfb_file(in->currfp, &in->pos);
    tf->pos = in->pos;
    tf->length1 = tf->length2 = 0;
    fclose(in->currfp);
    pf_identify(tf);
}
static char *pf_read_token(pfstate *);

/*
 * Read a character from the initial plaintext part of a Type 1 font
 */
static int pf_getc(pfstate *pf) {
    if (pf->offset == pf->curblock->length) {
	if (pf->curblock->next == NULL) return EOF;
	pf->curblock = pf->curblock->next;
	pf->offset = 0;
    }
    if (pf->curblock->type != PFB_ASCII) return EOF;
    return pf->curblock->data[pf->offset++];
}

static void pf_ungetc(int c, pfstate *pf) {
    assert(pf->offset > 0);
    pf->offset--;
    assert(c == pf->curblock->data[pf->offset]);
}

static void pf_rewind(pfstate *pf) {
    pf->curblock = pf->data;
    pf->offset = 0;
}

static void pf_seek(pfstate *pf, size_t off) {
    t1_data *td = pf->data;

    while (td->length < off) {
	off -= td->length;
	td = td->next;
    }
    pf->curblock = td;
    pf->offset = off;
}

static size_t pf_tell(pfstate *pf) {
    t1_data *td = pf->data;
    size_t o = 0;

    while (td != pf->curblock) {
	o += td->length;
	td = td->next;
    }
    return o + pf->offset;
}

static void pf_identify(t1_font *tf) {
    rdstringc rsc = { 0, 0, NULL };
    char *p;
    size_t len;
    char *fontname;
    font_info *fi;
    int c;
    pfstate pfs, *pf = &pfs;

    pf->data = tf->data;
    pf_rewind(pf);
    do {
	c = pf_getc(pf);
	if (c == EOF) {
	    sfree(rsc.text);
	    error(err_pfeof, &tf->pos);
	    return;
	}
	rdaddc(&rsc, c);
    } while (c != 012 && c != 015);
    p = rsc.text;
    if ((p = strchr(p, ':')) == NULL) {
	sfree(rsc.text);
	error(err_pfhead, &tf->pos);
	return;
    }
    p++;
    p += strspn(p, " \t");
    len = strcspn(p, " \t");
    fontname = snewn(len + 1, char);
    memcpy(fontname, p, len);
    fontname[len] = 0;
    sfree(rsc.text);

    for (fi = all_fonts; fi; fi = fi->next) {
	if (strcmp(fi->name, fontname) == 0) {
	    fi->fontfile = tf;
	    fi->filetype = TYPE1;
	    sfree(fontname);
	    return;
	}
    }
    error(err_pfnoafm, &tf->pos, fontname);
    sfree(fontname);
}

/*
 * PostScript white space characters; PLRM3 table 3.1
 */
static int pf_isspace(int c) {
    return c == 000 || c == 011 || c == 012 || c == 014 || c == 015 ||
	c == ' ';
}

/*
 * PostScript special characters; PLRM3 page 27
 */
static int pf_isspecial(int c) {
    return c == '(' || c == ')' || c == '<' || c == '>' || c == '[' ||
	c == ']' || c == '{' || c == '}' || c == '/' || c == '%';
}

static size_t pf_findtoken(t1_font *tf, size_t off, char const *needle) {
    char *tok;
    pfstate pfs, *pf = &pfs;

    pf->data = tf->data;
    pf_seek(pf, off);
    for (;;) {
	tok = pf_read_token(pf);
	if (tok == NULL) {
	    if (pf->offset == 0 && pf->curblock->type == PFB_BINARY)
		pf->curblock = pf->curblock->next;
	    else
		return (size_t)-1;
	} else {
	    if (strcmp(tok, needle) == 0) {
		sfree(tok);
		return pf_tell(pf);
	    }
	    sfree(tok);
	}
    }
}

static size_t pf_length1(t1_font *tf) {
    size_t ret;

    ret = pf_findtoken(tf, 0, "eexec");
    if (ret == (size_t)-1) {
	error(err_pfeof, &tf->pos);
	return 0;
    }
    return ret;
}

static size_t pf_length2(t1_font *tf) {
    size_t ret;

    if (tf->length1 == 0)
	tf->length1 = pf_length1(tf);
    ret = pf_findtoken(tf, tf->length1, "cleartomark");
    if (ret == (size_t)-1) {
	error(err_pfeof, &tf->pos);
	return 0;
    }
    return ret - 12 - tf->length1; /* backspace over "cleartomark\n" */
}

static void pf_getascii(t1_font *tf, size_t off, size_t len,
			char **bufp, size_t *lenp) {
    t1_data *td = tf->data;
    size_t blk, i;
    char *p;

    while (td && off >= td->length) {
	off -= td->length;
	td = td->next;
    }
    *bufp = NULL;
    *lenp = 0;
    while (td && len) {
	blk = len < td->length ? len : td->length;
	if (td->type == PFB_ASCII) {
	    *bufp = sresize(*bufp, *lenp + blk, char);
	    memcpy(*bufp + *lenp, td->data + off, blk);
	    *lenp += blk;
	} else {
	    *bufp = sresize(*bufp, *lenp + blk * 2 + blk / 39 + 3, char);
	    p = *bufp + *lenp;
	    for (i = 0; i < blk; i++) {
		if (i % 39 == 0) p += sprintf(p, "\n");
		p += sprintf(p, "%02x", td->data[off + i]);
	    }
	    p += sprintf(p, "\n");
	    *lenp = p - *bufp;
	}
	len -= blk;
	td = td->next;
	off = 0;
    }   
}

void pf_writeps(font_info const *fi, FILE *ofp) {
    char *buf;
    size_t len;

    pf_getascii(fi->fontfile, 0, INT_MAX, &buf, &len);
    fwrite(buf, 1, len, ofp);
    sfree(buf);
}

static int hexval(char c) {
    if (c >= '0' && c <= '9') return c - '0';
    if (c >= 'A' && c <= 'F') return c - 'A' + 0xA;
    if (c >= 'a' && c <= 'f') return c - 'a' + 0xa;
    return 0;
}

static void pf_getbinary(t1_font *tf, size_t off, size_t len,
			 char **bufp, size_t *lenp) {
    t1_data *td = tf->data;
    size_t blk, i;
    int havenybble = 0;
    char *p, nybble;

    while (td && off >= td->length) {
	off -= td->length;
	td = td->next;
    }
    *bufp = NULL;
    *lenp = 0;
    while (td && len) {
	blk = len < td->length ? len : td->length;
	if (td->type == PFB_BINARY) {
	    *bufp = sresize(*bufp, *lenp + blk, char);
	    memcpy(*bufp + *lenp, td->data + off, blk);
	    *lenp += blk;
	} else {
	    *bufp = sresize(*bufp, *lenp + blk / 2 + 1, char);
	    p = *bufp + *lenp;
	    for (i = 0; i < blk; i++) {
		if (pf_isspace(td->data[off + i])) continue;
		if (!havenybble)
		    nybble = hexval(td->data[off+i]);
		else
		    *p++ = (nybble << 4) | hexval(td->data[off+i]);
		havenybble = !havenybble;
	    }
	    *lenp = p - *bufp;
	}
	len -= blk;
	td = td->next;
	off = 0;
    }   
}


/*
 * Return the initial, unencrypted, part of a font.
 */
void pf_part1(font_info *fi, char **bufp, size_t *lenp) {
    t1_font *tf = fi->fontfile;

    if (tf->length1 == 0)
	tf->length1 = pf_length1(tf);
    pf_getascii(tf, 0, tf->length1, bufp, lenp);
}

/*
 * Return the middle, encrypted, part of a font.
 */
void pf_part2(font_info *fi, char **bufp, size_t *lenp) {
    t1_font *tf = fi->fontfile;

    if (tf->length2 == 0)
	tf->length2 = pf_length2(tf);
    pf_getbinary(tf, tf->length1, tf->length2, bufp, lenp);
    if (*lenp >= 256)
	*lenp -= 256;
}

static char *pf_read_litstring(pfstate *pf) {
    rdstringc rsc = { 0, 0, NULL };
    int depth = 1;
    int c;

    rdaddc(&rsc, '(');
    do {
	c = pf_getc(pf);
	switch (c) {
	  case '(':
	    depth++; break;
	  case ')':
	    depth--; break;
	  case '\\':
	    rdaddc(&rsc, '\\');
	    c = pf_getc(pf);
	    break;
	}
	if (c != EOF) rdaddc(&rsc, c);
    } while (depth > 0 && c != EOF);
    return rsc.text;
}

static char *pf_read_hexstring(pfstate *pf) {
    rdstringc rsc = { 0, 0, NULL };
    int c;

    rdaddc(&rsc, '<');
    do {
	c = pf_getc(pf);
	if (c != EOF) rdaddc(&rsc, c);
    } while (c != '>' && c != EOF);
    return rsc.text;
}   

static char *pf_read_word(pfstate *pf, int c) {
    rdstringc rsc = { 0, 0, NULL };

    rdaddc(&rsc, c);
    if (c == '{' || c == '}' || c == '[' || c == ']')
	return rsc.text;
    for (;;) {
	c = pf_getc(pf);
	if (pf_isspecial(c) || pf_isspace(c) || c == EOF) break;
	rdaddc(&rsc, c);
    }
    if (pf_isspecial(c)) pf_ungetc(c, pf);
    return rsc.text;
}   

static char *pf_read_token(pfstate *pf) {
    int c;

    do {
	c = pf_getc(pf);
    } while (pf_isspace(c));
    if (c == EOF) return NULL;
    if (c == '%') {
	do {
	    c = pf_getc(pf);
	} while (c != 012 && c != 015);
	return pf_read_token(pf);
    }
    if (c == '(') return pf_read_litstring(pf);
    if (c == '<') return pf_read_hexstring(pf);
    return pf_read_word(pf, c);
}
Commit	Line	Data
3e2dd889	1	/*
	2	* PostScript Type 1 font file support for Halibut
	3	*/
	4	/*
	5	* Type 1 font file formats are specified by Adobe Technical Note
	6	* #5040: "Supporting Downloadable PostScript Language Fonts".
	7	* Halibut supports hexadecimal format (section 3.1) and IBM PC format
	8	* (section 3.3), commonly called PFA and PFB respectively.
	9	*/
	10
	11	#include <assert.h>
	12	#include <limits.h>
44407fea	13	#include <stdio.h>
3e2dd889	14	#include <stdlib.h>
44407fea	15	#include "halibut.h"
	16	#include "paper.h"
	17
3e2dd889	18	#define PFB_ASCII 1
	19	#define PFB_BINARY 2
	20	#define PFB_EOF 3
	21
	22	typedef struct t1_font_Tag t1_font;
	23	typedef struct t1_data_Tag t1_data;
	24
	25	struct t1_font_Tag {
	26	t1_data *data;
	27	size_t length1;
	28	size_t length2;
	29	filepos pos;
	30	};
	31
	32	struct t1_data_Tag {
	33	char type;
	34	size_t length;
	35	unsigned char *data;
	36	t1_data *next;
	37	};
	38
	39	typedef struct pfstate_Tag {
	40	t1_data *data;
	41	t1_data *curblock;
	42	size_t offset;
	43	} pfstate;
	44
	45	static void pf_identify(t1_font *tf);
	46
	47	static t1_data load_pfb_file(FILE fp, filepos *pos) {
	48	t1_data head = NULL, tail = NULL;
	49	int c, i;
	50	char type;
	51
	52	pos->line = 0;
	53	for (;;) {
	54	if (fgetc(fp) != 128) abort();
	55	type = fgetc(fp);
	56	if (type == PFB_EOF) return head;
	57	if (tail) {
	58	tail->next = snew(t1_data);
	59	tail = tail->next;
	60	} else {
	61	head = snew(t1_data);
	62	tail = head;
	63	}
	64	tail->type = type;
	65	tail->length = 0;
	66	for (i = 0; i < 4; i++) {
	67	c = fgetc(fp);
	68	if (c == EOF) abort();
	69	tail->length \|= c << (8 * i);
	70	}
	71	tail->data = snewn(tail->length, unsigned char);
	72	if (fread(tail->data, 1, tail->length, fp) != tail->length) abort();
	73	}
	74	}
	75
	76	static t1_data load_pfa_file(FILE fp, filepos *pos) {
	77	t1_data *ret = snew(t1_data);
	78	size_t off = 0, len, got;
	79
	80	pos->line = 0;
	81	ret->type = PFB_ASCII;
82	len = 32768;
83	ret->data = snewn(len, unsigned char);
84	for (;;) {
85	got = fread(ret->data + off, 1, len - off, fp);
86	off += got;
87	if (off != len) break;
88	len *= 2;
89	ret->data = sresize(ret->data, len, unsigned char);
90	}
91	ret->data = sresize(ret->data, off, unsigned char);
92	ret->length = off;
93	return ret;
94	}
c885c2ff	95
44407fea	96	void read_pfa_file(input *in) {
3e2dd889	97	t1_font *tf = snew(t1_font);
	98
	99	tf->data = load_pfa_file(in->currfp, &in->pos);
	100	tf->pos = in->pos;
	101	tf->length1 = tf->length2 = 0;
	102	fclose(in->currfp);
	103	pf_identify(tf);
	104	}
	105
	106	void read_pfb_file(input *in) {
	107	t1_font *tf = snew(t1_font);
	108
	109	tf->data = load_pfb_file(in->currfp, &in->pos);
	110	tf->pos = in->pos;
	111	tf->length1 = tf->length2 = 0;
	112	fclose(in->currfp);
	113	pf_identify(tf);
	114	}
	115	static char pf_read_token(pfstate );
	116
	117	/*
	118	* Read a character from the initial plaintext part of a Type 1 font
	119	*/
	120	static int pf_getc(pfstate *pf) {
	121	if (pf->offset == pf->curblock->length) {
	122	if (pf->curblock->next == NULL) return EOF;
	123	pf->curblock = pf->curblock->next;
	124	pf->offset = 0;
	125	}
	126	if (pf->curblock->type != PFB_ASCII) return EOF;
	127	return pf->curblock->data[pf->offset++];
	128	}
	129
	130	static void pf_ungetc(int c, pfstate *pf) {
	131	assert(pf->offset > 0);
	132	pf->offset--;
	133	assert(c == pf->curblock->data[pf->offset]);
	134	}
	135
	136	static void pf_rewind(pfstate *pf) {
	137	pf->curblock = pf->data;
	138	pf->offset = 0;
	139	}
	140
	141	static void pf_seek(pfstate *pf, size_t off) {
	142	t1_data *td = pf->data;
	143
	144	while (td->length < off) {
	145	off -= td->length;
	146	td = td->next;
	147	}
	148	pf->curblock = td;
	149	pf->offset = off;
	150	}
	151
	152	static size_t pf_tell(pfstate *pf) {
	153	t1_data *td = pf->data;
	154	size_t o = 0;
	155
	156	while (td != pf->curblock) {
	157	o += td->length;
	158	td = td->next;
	159	}
	160	return o + pf->offset;
161	}
162
163	static void pf_identify(t1_font *tf) {
c885c2ff	164	rdstringc rsc = { 0, 0, NULL };
c885c2ff	165	char *p;
44407fea	166	size_t len;
	167	char *fontname;
	168	font_info *fi;
c885c2ff	169	int c;
3e2dd889	170	pfstate pfs, *pf = &pfs;
44407fea	171
3e2dd889	172	pf->data = tf->data;
3e2dd889	173	pf_rewind(pf);
c885c2ff	174	do {
3e2dd889	175	c = pf_getc(pf);
c885c2ff	176	if (c == EOF) {
c885c2ff	177	sfree(rsc.text);
3e2dd889	178	error(err_pfeof, &tf->pos);
c885c2ff	179	return;
	180	}
	181	rdaddc(&rsc, c);
	182	} while (c != 012 && c != 015);
	183	p = rsc.text;
	184	if ((p = strchr(p, ':')) == NULL) {
	185	sfree(rsc.text);
3e2dd889	186	error(err_pfhead, &tf->pos);
44407fea	187	return;
c885c2ff	188	}
c885c2ff	189	p++;
44407fea	190	p += strspn(p, " \t");
	191	len = strcspn(p, " \t");
	192	fontname = snewn(len + 1, char);
	193	memcpy(fontname, p, len);
	194	fontname[len] = 0;
c885c2ff	195	sfree(rsc.text);
c885c2ff	196
44407fea	197	for (fi = all_fonts; fi; fi = fi->next) {
44407fea	198	if (strcmp(fi->name, fontname) == 0) {
3e2dd889	199	fi->fontfile = tf;
babfe3e2	200	fi->filetype = TYPE1;
44407fea	201	sfree(fontname);
	202	return;
	203	}
	204	}
3e2dd889	205	error(err_pfnoafm, &tf->pos, fontname);
44407fea	206	sfree(fontname);
44407fea	207	}
c885c2ff	208
	209	/*
	210	* PostScript white space characters; PLRM3 table 3.1
	211	*/
	212	static int pf_isspace(int c) {
	213	return c == 000 \|\| c == 011 \|\| c == 012 \|\| c == 014 \|\| c == 015 \|\|
	214	c == ' ';
	215	}
	216
	217	/*
	218	* PostScript special characters; PLRM3 page 27
	219	*/
	220	static int pf_isspecial(int c) {
	221	return c == '(' \|\| c == ')' \|\| c == '<' \|\| c == '>' \|\| c == '[' \|\|
	222	c == ']' \|\| c == '{' \|\| c == '}' \|\| c == '/' \|\| c == '%';
	223	}
	224
3e2dd889	225	static size_t pf_findtoken(t1_font tf, size_t off, char const needle) {
c885c2ff	226	char *tok;
3e2dd889	227	pfstate pfs, *pf = &pfs;
c885c2ff	228
3e2dd889	229	pf->data = tf->data;
	230	pf_seek(pf, off);
	231	for (;;) {
	232	tok = pf_read_token(pf);
	233	if (tok == NULL) {
	234	if (pf->offset == 0 && pf->curblock->type == PFB_BINARY)
	235	pf->curblock = pf->curblock->next;
	236	else
	237	return (size_t)-1;
	238	} else {
	239	if (strcmp(tok, needle) == 0) {
	240	sfree(tok);
	241	return pf_tell(pf);
	242	}
	243	sfree(tok);
	244	}
c885c2ff	245	}
3e2dd889	246	}
	247
	248	static size_t pf_length1(t1_font *tf) {
	249	size_t ret;
	250
	251	ret = pf_findtoken(tf, 0, "eexec");
	252	if (ret == (size_t)-1) {
	253	error(err_pfeof, &tf->pos);
c885c2ff	254	return 0;
c885c2ff	255	}
3e2dd889	256	return ret;
c885c2ff	257	}
c885c2ff	258
3e2dd889	259	static size_t pf_length2(t1_font *tf) {
	260	size_t ret;
	261
	262	if (tf->length1 == 0)
	263	tf->length1 = pf_length1(tf);
	264	ret = pf_findtoken(tf, tf->length1, "cleartomark");
	265	if (ret == (size_t)-1) {
	266	error(err_pfeof, &tf->pos);
	267	return 0;
	268	}
	269	return ret - 12 - tf->length1; /* backspace over "cleartomark\n" */
	270	}
	271
	272	static void pf_getascii(t1_font *tf, size_t off, size_t len,
	273	char *bufp, size_t lenp) {
	274	t1_data *td = tf->data;
	275	size_t blk, i;
	276	char *p;
	277
	278	while (td && off >= td->length) {
	279	off -= td->length;
	280	td = td->next;
c885c2ff	281	}
3e2dd889	282	*bufp = NULL;
	283	*lenp = 0;
	284	while (td && len) {
	285	blk = len < td->length ? len : td->length;
	286	if (td->type == PFB_ASCII) {
	287	bufp = sresize(bufp, *lenp + blk, char);
	288	memcpy(bufp + lenp, td->data + off, blk);
	289	*lenp += blk;
	290	} else {
	291	bufp = sresize(bufp, lenp + blk 2 + blk / 39 + 3, char);
	292	p = bufp + lenp;
	293	for (i = 0; i < blk; i++) {
	294	if (i % 39 == 0) p += sprintf(p, "\n");
	295	p += sprintf(p, "%02x", td->data[off + i]);
	296	}
	297	p += sprintf(p, "\n");
	298	lenp = p - bufp;
	299	}
	300	len -= blk;
	301	td = td->next;
	302	off = 0;
	303	}
	304	}
	305
	306	void pf_writeps(font_info const fi, FILE ofp) {
	307	char *buf;
	308	size_t len;
	309
	310	pf_getascii(fi->fontfile, 0, INT_MAX, &buf, &len);
	311	fwrite(buf, 1, len, ofp);
	312	sfree(buf);
c885c2ff	313	}
	314
	315	static int hexval(char c) {
	316	if (c >= '0' && c <= '9') return c - '0';
	317	if (c >= 'A' && c <= 'F') return c - 'A' + 0xA;
	318	if (c >= 'a' && c <= 'f') return c - 'a' + 0xa;
	319	return 0;
	320	}
	321
3e2dd889	322	static void pf_getbinary(t1_font *tf, size_t off, size_t len,
	323	char *bufp, size_t lenp) {
	324	t1_data *td = tf->data;
	325	size_t blk, i;
	326	int havenybble = 0;
	327	char *p, nybble;
	328
	329	while (td && off >= td->length) {
	330	off -= td->length;
	331	td = td->next;
	332	}
	333	*bufp = NULL;
	334	*lenp = 0;
	335	while (td && len) {
	336	blk = len < td->length ? len : td->length;
	337	if (td->type == PFB_BINARY) {
	338	bufp = sresize(bufp, *lenp + blk, char);
	339	memcpy(bufp + lenp, td->data + off, blk);
	340	*lenp += blk;
	341	} else {
	342	bufp = sresize(bufp, *lenp + blk / 2 + 1, char);
	343	p = bufp + lenp;
	344	for (i = 0; i < blk; i++) {
	345	if (pf_isspace(td->data[off + i])) continue;
	346	if (!havenybble)
	347	nybble = hexval(td->data[off+i]);
	348	else
	349	*p++ = (nybble << 4) \| hexval(td->data[off+i]);
	350	havenybble = !havenybble;
	351	}
	352	lenp = p - bufp;
	353	}
	354	len -= blk;
	355	td = td->next;
	356	off = 0;
	357	}
	358	}
	359
	360
	361	/*
	362	* Return the initial, unencrypted, part of a font.
	363	*/
	364	void pf_part1(font_info fi, char bufp, size_t lenp) {
	365	t1_font *tf = fi->fontfile;
	366
	367	if (tf->length1 == 0)
	368	tf->length1 = pf_length1(tf);
	369	pf_getascii(tf, 0, tf->length1, bufp, lenp);
	370	}
	371
c885c2ff	372	/*
	373	* Return the middle, encrypted, part of a font.
	374	*/
	375	void pf_part2(font_info fi, char bufp, size_t lenp) {
3e2dd889	376	t1_font *tf = fi->fontfile;
c885c2ff	377
3e2dd889	378	if (tf->length2 == 0)
	379	tf->length2 = pf_length2(tf);
	380	pf_getbinary(tf, tf->length1, tf->length2, bufp, lenp);
	381	if (*lenp >= 256)
	382	*lenp -= 256;
c885c2ff	383	}
c885c2ff	384
3e2dd889	385	static char pf_read_litstring(pfstate pf) {
c885c2ff	386	rdstringc rsc = { 0, 0, NULL };
	387	int depth = 1;
	388	int c;
	389
	390	rdaddc(&rsc, '(');
	391	do {
3e2dd889	392	c = pf_getc(pf);
c885c2ff	393	switch (c) {
	394	case '(':
	395	depth++; break;
	396	case ')':
	397	depth--; break;
	398	case '\\':
	399	rdaddc(&rsc, '\\');
3e2dd889	400	c = pf_getc(pf);
c885c2ff	401	break;
	402	}
	403	if (c != EOF) rdaddc(&rsc, c);
	404	} while (depth > 0 && c != EOF);
	405	return rsc.text;
	406	}
	407
3e2dd889	408	static char pf_read_hexstring(pfstate pf) {
c885c2ff	409	rdstringc rsc = { 0, 0, NULL };
	410	int c;
	411
	412	rdaddc(&rsc, '<');
	413	do {
3e2dd889	414	c = pf_getc(pf);
c885c2ff	415	if (c != EOF) rdaddc(&rsc, c);
	416	} while (c != '>' && c != EOF);
	417	return rsc.text;
	418	}
	419
3e2dd889	420	static char pf_read_word(pfstate pf, int c) {
c885c2ff	421	rdstringc rsc = { 0, 0, NULL };
	422
	423	rdaddc(&rsc, c);
	424	if (c == '{' \|\| c == '}' \|\| c == '[' \|\| c == ']')
	425	return rsc.text;
	426	for (;;) {
3e2dd889	427	c = pf_getc(pf);
c885c2ff	428	if (pf_isspecial(c) \|\| pf_isspace(c) \|\| c == EOF) break;
	429	rdaddc(&rsc, c);
	430	}
3e2dd889	431	if (pf_isspecial(c)) pf_ungetc(c, pf);
c885c2ff	432	return rsc.text;
	433	}
	434
3e2dd889	435	static char pf_read_token(pfstate pf) {
c885c2ff	436	int c;
	437
	438	do {
3e2dd889	439	c = pf_getc(pf);
c885c2ff	440	} while (pf_isspace(c));
	441	if (c == EOF) return NULL;
	442	if (c == '%') {
	443	do {
3e2dd889	444	c = pf_getc(pf);
c885c2ff	445	} while (c != 012 && c != 015);
3e2dd889	446	return pf_read_token(pf);
c885c2ff	447	}
3e2dd889	448	if (c == '(') return pf_read_litstring(pf);
	449	if (c == '<') return pf_read_hexstring(pf);
	450	return pf_read_word(pf, c);
c885c2ff	451	}