[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;
	    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;
44407fea	200	sfree(fontname);
	201	return;
	202	}
	203	}
3e2dd889	204	error(err_pfnoafm, &tf->pos, fontname);
44407fea	205	sfree(fontname);
44407fea	206	}
c885c2ff	207
	208	/*
	209	* PostScript white space characters; PLRM3 table 3.1
	210	*/
	211	static int pf_isspace(int c) {
	212	return c == 000 \|\| c == 011 \|\| c == 012 \|\| c == 014 \|\| c == 015 \|\|
	213	c == ' ';
	214	}
	215
	216	/*
	217	* PostScript special characters; PLRM3 page 27
	218	*/
	219	static int pf_isspecial(int c) {
	220	return c == '(' \|\| c == ')' \|\| c == '<' \|\| c == '>' \|\| c == '[' \|\|
	221	c == ']' \|\| c == '{' \|\| c == '}' \|\| c == '/' \|\| c == '%';
	222	}
	223
3e2dd889	224	static size_t pf_findtoken(t1_font tf, size_t off, char const needle) {
c885c2ff	225	char *tok;
3e2dd889	226	pfstate pfs, *pf = &pfs;
c885c2ff	227
3e2dd889	228	pf->data = tf->data;
	229	pf_seek(pf, off);
	230	for (;;) {
	231	tok = pf_read_token(pf);
	232	if (tok == NULL) {
	233	if (pf->offset == 0 && pf->curblock->type == PFB_BINARY)
	234	pf->curblock = pf->curblock->next;
	235	else
	236	return (size_t)-1;
	237	} else {
	238	if (strcmp(tok, needle) == 0) {
	239	sfree(tok);
	240	return pf_tell(pf);
	241	}
	242	sfree(tok);
	243	}
c885c2ff	244	}
3e2dd889	245	}
	246
	247	static size_t pf_length1(t1_font *tf) {
	248	size_t ret;
	249
	250	ret = pf_findtoken(tf, 0, "eexec");
	251	if (ret == (size_t)-1) {
	252	error(err_pfeof, &tf->pos);
c885c2ff	253	return 0;
c885c2ff	254	}
3e2dd889	255	return ret;
c885c2ff	256	}
c885c2ff	257
3e2dd889	258	static size_t pf_length2(t1_font *tf) {
	259	size_t ret;
	260
	261	if (tf->length1 == 0)
	262	tf->length1 = pf_length1(tf);
	263	ret = pf_findtoken(tf, tf->length1, "cleartomark");
	264	if (ret == (size_t)-1) {
	265	error(err_pfeof, &tf->pos);
	266	return 0;
	267	}
	268	return ret - 12 - tf->length1; /* backspace over "cleartomark\n" */
	269	}
	270
	271	static void pf_getascii(t1_font *tf, size_t off, size_t len,
	272	char *bufp, size_t lenp) {
	273	t1_data *td = tf->data;
	274	size_t blk, i;
	275	char *p;
	276
	277	while (td && off >= td->length) {
	278	off -= td->length;
	279	td = td->next;
c885c2ff	280	}
3e2dd889	281	*bufp = NULL;
	282	*lenp = 0;
	283	while (td && len) {
	284	blk = len < td->length ? len : td->length;
	285	if (td->type == PFB_ASCII) {
	286	bufp = sresize(bufp, *lenp + blk, char);
	287	memcpy(bufp + lenp, td->data + off, blk);
	288	*lenp += blk;
	289	} else {
	290	bufp = sresize(bufp, lenp + blk 2 + blk / 39 + 3, char);
	291	p = bufp + lenp;
	292	for (i = 0; i < blk; i++) {
	293	if (i % 39 == 0) p += sprintf(p, "\n");
	294	p += sprintf(p, "%02x", td->data[off + i]);
	295	}
	296	p += sprintf(p, "\n");
	297	lenp = p - bufp;
	298	}
	299	len -= blk;
	300	td = td->next;
	301	off = 0;
	302	}
	303	}
	304
	305	void pf_writeps(font_info const fi, FILE ofp) {
	306	char *buf;
	307	size_t len;
	308
	309	pf_getascii(fi->fontfile, 0, INT_MAX, &buf, &len);
	310	fwrite(buf, 1, len, ofp);
	311	sfree(buf);
c885c2ff	312	}
	313
	314	static int hexval(char c) {
	315	if (c >= '0' && c <= '9') return c - '0';
	316	if (c >= 'A' && c <= 'F') return c - 'A' + 0xA;
	317	if (c >= 'a' && c <= 'f') return c - 'a' + 0xa;
	318	return 0;
	319	}
	320
3e2dd889	321	static void pf_getbinary(t1_font *tf, size_t off, size_t len,
	322	char *bufp, size_t lenp) {
	323	t1_data *td = tf->data;
	324	size_t blk, i;
	325	int havenybble = 0;
	326	char *p, nybble;
	327
	328	while (td && off >= td->length) {
	329	off -= td->length;
	330	td = td->next;
	331	}
	332	*bufp = NULL;
	333	*lenp = 0;
	334	while (td && len) {
	335	blk = len < td->length ? len : td->length;
	336	if (td->type == PFB_BINARY) {
	337	bufp = sresize(bufp, *lenp + blk, char);
	338	memcpy(bufp + lenp, td->data + off, blk);
	339	*lenp += blk;
	340	} else {
	341	bufp = sresize(bufp, *lenp + blk / 2 + 1, char);
	342	p = bufp + lenp;
	343	for (i = 0; i < blk; i++) {
	344	if (pf_isspace(td->data[off + i])) continue;
	345	if (!havenybble)
	346	nybble = hexval(td->data[off+i]);
	347	else
	348	*p++ = (nybble << 4) \| hexval(td->data[off+i]);
	349	havenybble = !havenybble;
	350	}
	351	lenp = p - bufp;
	352	}
	353	len -= blk;
	354	td = td->next;
	355	off = 0;
	356	}
	357	}
	358
	359
	360	/*
	361	* Return the initial, unencrypted, part of a font.
	362	*/
	363	void pf_part1(font_info fi, char bufp, size_t lenp) {
	364	t1_font *tf = fi->fontfile;
	365
	366	if (tf->length1 == 0)
	367	tf->length1 = pf_length1(tf);
	368	pf_getascii(tf, 0, tf->length1, bufp, lenp);
	369	}
	370
c885c2ff	371	/*
	372	* Return the middle, encrypted, part of a font.
	373	*/
	374	void pf_part2(font_info fi, char bufp, size_t lenp) {
3e2dd889	375	t1_font *tf = fi->fontfile;
c885c2ff	376
3e2dd889	377	if (tf->length2 == 0)
	378	tf->length2 = pf_length2(tf);
	379	pf_getbinary(tf, tf->length1, tf->length2, bufp, lenp);
	380	if (*lenp >= 256)
	381	*lenp -= 256;
c885c2ff	382	}
c885c2ff	383
3e2dd889	384	static char pf_read_litstring(pfstate pf) {
c885c2ff	385	rdstringc rsc = { 0, 0, NULL };
	386	int depth = 1;
	387	int c;
	388
	389	rdaddc(&rsc, '(');
	390	do {
3e2dd889	391	c = pf_getc(pf);
c885c2ff	392	switch (c) {
	393	case '(':
	394	depth++; break;
	395	case ')':
	396	depth--; break;
	397	case '\\':
	398	rdaddc(&rsc, '\\');
3e2dd889	399	c = pf_getc(pf);
c885c2ff	400	break;
	401	}
	402	if (c != EOF) rdaddc(&rsc, c);
	403	} while (depth > 0 && c != EOF);
	404	return rsc.text;
	405	}
	406
3e2dd889	407	static char pf_read_hexstring(pfstate pf) {
c885c2ff	408	rdstringc rsc = { 0, 0, NULL };
	409	int c;
	410
	411	rdaddc(&rsc, '<');
	412	do {
3e2dd889	413	c = pf_getc(pf);
c885c2ff	414	if (c != EOF) rdaddc(&rsc, c);
	415	} while (c != '>' && c != EOF);
	416	return rsc.text;
	417	}
	418
3e2dd889	419	static char pf_read_word(pfstate pf, int c) {
c885c2ff	420	rdstringc rsc = { 0, 0, NULL };
	421
	422	rdaddc(&rsc, c);
	423	if (c == '{' \|\| c == '}' \|\| c == '[' \|\| c == ']')
	424	return rsc.text;
	425	for (;;) {
3e2dd889	426	c = pf_getc(pf);
c885c2ff	427	if (pf_isspecial(c) \|\| pf_isspace(c) \|\| c == EOF) break;
	428	rdaddc(&rsc, c);
	429	}
3e2dd889	430	if (pf_isspecial(c)) pf_ungetc(c, pf);
c885c2ff	431	return rsc.text;
	432	}
	433
3e2dd889	434	static char pf_read_token(pfstate pf) {
c885c2ff	435	int c;
	436
	437	do {
3e2dd889	438	c = pf_getc(pf);
c885c2ff	439	} while (pf_isspace(c));
	440	if (c == EOF) return NULL;
	441	if (c == '%') {
	442	do {
3e2dd889	443	c = pf_getc(pf);
c885c2ff	444	} while (c != 012 && c != 015);
3e2dd889	445	return pf_read_token(pf);
c885c2ff	446	}
3e2dd889	447	if (c == '(') return pf_read_litstring(pf);
	448	if (c == '<') return pf_read_hexstring(pf);
	449	return pf_read_word(pf, c);
c885c2ff	450	}