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|
/* t1asm -*- c-basic-offset: 2 -*-
*
* This program `assembles' Adobe Type-1 font programs in pseudo-PostScript
* form into either PFB or PFA format. The human readable/editable input is
* charstring- and eexec-encrypted as specified in the `Adobe Type 1 Font
* Format' version 1.1 (the `black book'). There is a companion program,
* t1disasm, which `disassembles' PFB and PFA files into a pseudo-PostScript
* file.
*
* Copyright (c) 1992 by I. Lee Hetherington, all rights reserved.
* Copyright (c) 1998-2017 Eddie Kohler
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, subject to the
* conditions listed in the Click LICENSE file, which is available in full at
* http://github.com/kohler/click/blob/master/LICENSE. The conditions
* include: you must preserve this copyright notice, and you cannot mention
* the copyright holders in advertising related to the Software without
* their permission. The Software is provided WITHOUT ANY WARRANTY, EXPRESS
* OR IMPLIED. This notice is a summary of the Click LICENSE file; the
* license in that file is binding.
*
* New change log in `NEWS'. Old change log:
*
* Revision 1.4 92/07/10 10:53:09 ilh
* Added support for additional PostScript after the closefile command
* (ie., some fonts have {restore}if after the cleartomark).
*
* Revision 1.3 92/06/23 10:58:25 ilh
* MSDOS porting by Kai-Uwe Herbing (herbing@netmbx.netmbx.de)
* incoporated.
*
* Revision 1.2 92/05/22 11:54:45 ilh
* Fixed bug where integers larger than 32000 could not be encoded in
* charstrings. Now integer range is correct for four-byte
* twos-complement integers: -(1<<31) <= i <= (1<<31)-1. Bug detected by
* Piet Tutelaers (rcpt@urc.tue.nl).
*
* Revision 1.1 92/05/22 11:48:46 ilh
* initial version
*
* Ported to Microsoft C/C++ Compiler and MS-DOS operating system by
* Kai-Uwe Herbing (herbing@netmbx.netmbx.de) on June 12, 1992. Code
* specific to the MS-DOS version is encapsulated with #ifdef _MSDOS
* ... #endif, where _MSDOS is an identifier, which is automatically
* defined, if you compile with the Microsoft C/C++ Compiler.
*
*/
/* Note: this is ANSI C. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#if defined(_MSDOS) || defined(_WIN32)
# include <fcntl.h>
# include <io.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stdarg.h>
#include <errno.h>
#include <lcdf/clp.h>
#include "t1lib.h"
#include "t1asmhelp.h"
#define LINESIZE 512
#ifdef __cplusplus
extern "C" {
#endif
typedef unsigned char byte;
static FILE *ifp;
static FILE *ofp;
static struct pfb_writer w;
static int blocklen = -1;
/* flags */
static int pfb = 1;
static int active = 0;
static int ever_active = 0;
static int start_charstring = 0;
static int in_eexec = 0;
/* need to add 1 as space for \0 */
static char line[LINESIZE + 1];
/* for charstring buffering */
static byte *charstring_buf, *charstring_bp;
static int charstring_bufsiz;
/* decryption stuff */
static uint16_t er, cr;
static const uint32_t c1 = 52845;
static const uint32_t c2 = 22719;
/* table of charstring commands */
static struct command {
const char *name;
int one, two;
} command_table[] = {
{ "abs", 12, 9 }, /* Type 2 */
{ "add", 12, 10 }, /* Type 2 */
{ "and", 12, 3 }, /* Type 2 */
{ "blend", 16, -1 }, /* Type 2 */
{ "callgsubr", 29, -1 }, /* Type 2 */
{ "callother", 12, 16 }, /* Type 1 ONLY */
{ "callothersubr", 12, 16 }, /* Type 1 ONLY */
{ "callsubr", 10, -1 },
{ "closepath", 9, -1 }, /* Type 1 ONLY */
{ "cntrmask", 20, -1 }, /* Type 2 */
{ "div", 12, 12 },
{ "dotsection", 12, 0 }, /* Type 1 ONLY */
{ "drop", 12, 18 }, /* Type 2 */
{ "dup", 12, 27 }, /* Type 2 */
{ "endchar", 14, -1 },
{ "eq", 12, 15 }, /* Type 2 */
{ "error", 0, -1 }, /* special */
{ "escape", 12, -1 }, /* special */
{ "exch", 12, 28 }, /* Type 2 */
{ "flex", 12, 35 }, /* Type 2 */
{ "flex1", 12, 37 }, /* Type 2 */
{ "get", 12, 21 }, /* Type 2 */
{ "hflex", 12, 34 }, /* Type 2 */
{ "hflex1", 12, 36 }, /* Type 2 */
{ "hhcurveto", 27, -1 }, /* Type 2 */
{ "hintmask", 19, -1 }, /* Type 2 */
{ "hlineto", 6, -1 },
{ "hmoveto", 22, -1 },
{ "hsbw", 13, -1 }, /* Type 1 ONLY */
{ "hstem", 1, -1 },
{ "hstem3", 12, 2 }, /* Type 1 ONLY */
{ "hstemhm", 18, -1 }, /* Type 2 */
{ "hvcurveto", 31, -1 },
{ "ifelse", 12, 22 }, /* Type 2 */
{ "index", 12, 29 }, /* Type 2 */
{ "load", 12, 13 }, /* Type 2 */
{ "mul", 12, 24 }, /* Type 2 */
{ "neg", 12, 14 }, /* Type 2 */
{ "not", 12, 5 }, /* Type 2 */
{ "or", 12, 4 }, /* Type 2 */
{ "pop", 12, 17 }, /* Type 1 ONLY */
{ "put", 12, 20 }, /* Type 2 */
{ "random", 12, 23 }, /* Type 2 */
{ "rcurveline", 24, -1 }, /* Type 2 */
{ "return", 11, -1 },
{ "rlinecurve", 25, -1 }, /* Type 2 */
{ "rlineto", 5, -1 },
{ "rmoveto", 21, -1 },
{ "roll", 12, 30 }, /* Type 2 */
{ "rrcurveto", 8, -1 },
{ "sbw", 12, 7 }, /* Type 1 ONLY */
{ "seac", 12, 6 }, /* Type 1 ONLY */
{ "setcurrentpoint", 12, 33 }, /* Type 1 ONLY */
{ "sqrt", 12, 26 }, /* Type 2 */
{ "store", 12, 8 }, /* Type 2 */
{ "sub", 12, 11 }, /* Type 2 */
{ "vhcurveto", 30, -1 },
{ "vlineto", 7, -1 },
{ "vmoveto", 4, -1 },
{ "vstem", 3, -1 },
{ "vstem3", 12, 1 }, /* Type 1 ONLY */
{ "vstemhm", 23, -1 }, /* Type 2 */
{ "vvcurveto", 26, -1 }, /* Type 2 */
}; /* alphabetical */
/* Two separate encryption functions because eexec and charstring encryption
must proceed in parallel. */
static byte eencrypt(byte plain)
{
byte cipher;
cipher = (byte)(plain ^ (er >> 8));
er = (uint16_t)((cipher + er) * c1 + c2);
return cipher;
}
static byte cencrypt(byte plain)
{
byte cipher;
/* Thanks to Tom Kacvinsky <tjk@ams.org> who reported that lenIV == -1 means
unencrypted charstrings. */
if (lenIV < 0) return plain;
cipher = (byte)(plain ^ (cr >> 8));
cr = (uint16_t)((cipher + cr) * c1 + c2);
return cipher;
}
/* This function outputs a single byte. If output is in PFB format then output
is buffered through blockbuf[]. If output is in PFA format, then output
will be hexadecimal if in_eexec is set, ASCII otherwise. */
static void output_byte(byte b)
{
static const char *hexchar = "0123456789abcdef";
static int hexcol = 0;
if (pfb) {
/* PFB */
PFB_OUTPUT_BYTE(&w, b);
} else {
/* PFA */
if (in_eexec) {
/* trim hexadecimal lines to `blocklen' columns */
if (hexcol >= blocklen) {
putc('\n', ofp);
hexcol = 0;
}
putc(hexchar[(b >> 4) & 0xf], ofp);
putc(hexchar[b & 0xf], ofp);
hexcol += 2;
} else {
putc(b, ofp);
}
}
}
/* This function outputs a byte through possible eexec encryption. */
static void eexec_byte(byte b)
{
if (in_eexec)
output_byte(eencrypt(b));
else
output_byte(b);
}
/* This function outputs a null-terminated string through possible eexec
encryption. */
static void eexec_string(const char *string)
{
while (*string)
eexec_byte(*string++);
}
/* This function gets ready for the eexec-encrypted data. If output is in
PFB format then flush current ASCII block and get ready for binary block.
We start encryption with four random (zero) bytes. */
static void eexec_start(char *string)
{
eexec_string("currentfile eexec\n");
if (pfb && w.blocktyp != PFB_BINARY) {
pfb_writer_output_block(&w);
w.blocktyp = PFB_BINARY;
}
in_eexec = 1;
er = 55665;
eexec_byte(0);
eexec_byte(0);
eexec_byte(0);
eexec_byte(0);
eexec_string(string);
}
/* 25.Aug.1999 -- Return 1 if this line actually looks like the start of a
charstring. We use the heuristic that it should start with `/' (a name) or
`dup' (a subroutine). Previous heuristic caused killa bad output. */
static int check_line_charstring(void)
{
char *p = line;
while (isspace((unsigned char) *p))
p++;
return (*p == '/' || (p[0] == 'd' && p[1] == 'u' && p[2] == 'p'));
}
/* This function returns an input line of characters. A line is terminated by
length (including terminating null) greater than LINESIZE, \r, \n, \r\n, or
when active (looking for charstrings) by '{'. When terminated by a newline
the newline is put into line[]. When terminated by '{', the '{' is not put
into line[], and the flag start_charstring is set to 1. */
static void t1utils_getline(void)
{
int c;
char *p = line;
int comment = 0;
start_charstring = 0;
while (p < line + LINESIZE) {
c = getc(ifp);
if (c == EOF)
break;
else if (c == '%')
comment = 1;
else if (active && !comment && c == '{') {
/* 25.Aug.1999 -- new check for whether we should stop be active */
if (check_line_charstring()) {
start_charstring = 1;
break;
} else
active = 0;
}
*p++ = (char) c;
/* end of line processing: change CR or CRLF into LF, and exit */
if (c == '\r') {
c = getc(ifp);
if (c != '\n')
ungetc(c, ifp);
p[-1] = '\n';
break;
} else if (c == '\n')
break;
}
*p = '\0';
}
/* This function wraps-up the eexec-encrypted data and writes ASCII trailer.
If output is in PFB format then this entails flushing binary block and
starting an ASCII block. */
static void eexec_end(void)
{
int i, j;
if (!pfb)
putc('\n', ofp);
else if (w.blocktyp != PFB_ASCII) {
pfb_writer_output_block(&w);
w.blocktyp = PFB_ASCII;
}
in_eexec = active = 0;
for (i = 0; i < 8; i++) {
for (j = 0; j < 64; j++)
eexec_byte('0');
eexec_byte('\n');
}
}
/* This function is used by the binary search, bsearch(), for command names in
the command table. */
static int CDECL command_compare(const void *key, const void *item)
{
return strcmp((const char *) key, ((const struct command *) item)->name);
}
/* This function returns 1 if the string is an integer and 0 otherwise. */
static int is_integer(char *string)
{
if (isdigit((unsigned char) string[0]) || string[0] == '-' || string[0] == '+') {
while (*++string && isdigit((unsigned char) *string))
; /* deliberately empty */
if (!*string)
return 1;
}
return 0;
}
/* This function initializes charstring encryption. Note that this is called
at the beginning of every charstring. */
static void charstring_start(void)
{
int i;
if (!charstring_buf) {
charstring_bufsiz = 65536;
if (!(charstring_buf = (byte *) malloc(charstring_bufsiz)))
fatal_error("out of memory");
}
charstring_bp = charstring_buf;
cr = 4330;
for (i = 0; i < lenIV; i++)
*charstring_bp++ = cencrypt((byte) 0);
}
/* This function encrypts and buffers a single byte of charstring data. */
static void charstring_byte(int v)
{
byte b = (byte)(v & 0xff);
if (charstring_bp - charstring_buf == charstring_bufsiz) {
charstring_bufsiz *= 2;
if (!(charstring_buf = (byte *) realloc(charstring_buf, charstring_bufsiz)))
fatal_error("out of memory");
charstring_bp = charstring_buf + charstring_bufsiz / 2;
}
*charstring_bp++ = cencrypt(b);
}
/* This function outputs buffered, encrypted charstring data through possible
eexec encryption. */
static void charstring_end(void)
{
byte *bp;
sprintf(line, "%d ", (int) (charstring_bp - charstring_buf));
eexec_string(line);
sprintf(line, "%s ", cs_start);
eexec_string(line);
for (bp = charstring_buf; bp < charstring_bp; bp++)
eexec_byte(*bp);
}
/* This function generates the charstring representation of an integer. */
static void charstring_int(int num)
{
int x;
if (num >= -107 && num <= 107) {
charstring_byte(num + 139);
} else if (num >= 108 && num <= 1131) {
x = num - 108;
charstring_byte(x / 256 + 247);
charstring_byte(x % 256);
} else if (num >= -1131 && num <= -108) {
x = abs(num) - 108;
charstring_byte(x / 256 + 251);
charstring_byte(x % 256);
} else if (num >= (-2147483647-1) && num <= 2147483647) {
charstring_byte(255);
charstring_byte(num >> 24);
charstring_byte(num >> 16);
charstring_byte(num >> 8);
charstring_byte(num);
} else {
error("can't format huge number `%d'", num);
/* output 0 instead */
charstring_byte(139);
}
}
/* This function returns one charstring token. It ignores comments. */
static void get_charstring_token(void)
{
int c = getc(ifp);
while (isspace(c))
c = getc(ifp);
if (c == '%') {
while (c != EOF && c != '\r' && c != '\n')
c = getc(ifp);
get_charstring_token();
} else if (c == '}') {
line[0] = '}';
line[1] = 0;
} else {
char *p = line;
while (p < line + LINESIZE) {
*p++ = c;
c = getc(ifp);
if (c == EOF || isspace(c) || c == '%' || c == '}') {
ungetc(c, ifp);
break;
}
}
*p = 0;
}
}
/* This function parses an entire charstring into integers and commands,
outputting bytes through the charstring buffer. */
static void parse_charstring(void)
{
struct command *cp;
charstring_start();
while (!feof(ifp)) {
get_charstring_token();
if (line[0] == '}')
break;
if (is_integer(line)) {
charstring_int(atoi(line));
} else {
int one;
int two;
int ok = 0;
cp = (struct command *)
bsearch((void *) line, (void *) command_table,
sizeof(command_table) / sizeof(struct command),
sizeof(struct command),
command_compare);
if (cp) {
one = cp->one;
two = cp->two;
ok = 1;
} else if (strncmp(line, "escape_", 7) == 0) {
/* Parse the `escape' keyword requested by Lee Chun-Yu and Werner
Lemberg */
one = 12;
if (sscanf(line + 7, "%d", &two) == 1)
ok = 1;
} else if (strncmp(line, "UNKNOWN_", 8) == 0) {
/* Allow unanticipated UNKNOWN commands. */
one = 12;
if (sscanf(line + 8, "12_%d", &two) == 1)
ok = 1;
else if (sscanf(line + 8, "%d", &one) == 1) {
two = -1;
ok = 1;
}
}
if (!ok)
error("unknown charstring command `%s'", line);
else if (one < 0 || one > 255)
error("bad charstring command number `%d'", one);
else if (two > 255)
error("bad charstring command number `%d'", two);
else if (two < 0)
charstring_byte(one);
else {
charstring_byte(one);
charstring_byte(two);
}
}
}
charstring_end();
}
/*****
* Command line
**/
#define BLOCK_LEN_OPT 300
#define OUTPUT_OPT 301
#define VERSION_OPT 302
#define HELP_OPT 303
#define PFB_OPT 304
#define PFA_OPT 305
static Clp_Option options[] = {
{ "block-length", 'l', BLOCK_LEN_OPT, Clp_ValInt, 0 },
{ "help", 0, HELP_OPT, 0, 0 },
{ "line-length", 0, BLOCK_LEN_OPT, Clp_ValInt, 0 },
{ "output", 'o', OUTPUT_OPT, Clp_ValString, 0 },
{ "pfa", 'a', PFA_OPT, 0, 0 },
{ "pfb", 'b', PFB_OPT, 0, 0 },
{ "version", 0, VERSION_OPT, 0, 0 },
};
static const char *program_name;
void
fatal_error(const char *message, ...)
{
va_list val;
va_start(val, message);
fprintf(stderr, "%s: ", program_name);
vfprintf(stderr, message, val);
putc('\n', stderr);
va_end(val);
exit(1);
}
void
error(const char *message, ...)
{
va_list val;
va_start(val, message);
fprintf(stderr, "%s: ", program_name);
vfprintf(stderr, message, val);
putc('\n', stderr);
va_end(val);
}
static void
short_usage(void)
{
fprintf(stderr, "Usage: %s [OPTION]... [INPUT [OUTPUT]]\n\
Try `%s --help' for more information.\n",
program_name, program_name);
}
static void
usage(void)
{
printf("\
`T1asm' translates a human-readable version of a PostScript Type 1 font into\n\
standard PFB or PFA format. The result is written to the standard output\n\
unless an OUTPUT file is given.\n\
\n\
Usage: %s [OPTION]... [INPUT [OUTPUT]]\n\
\n\
Options:\n\
-a, --pfa Output font in ASCII (PFA) format.\n\
-b, --pfb Output font in binary (PFB) format. This is\n\
the default.\n\
-l, --block-length NUM Set max block length for PFB output.\n\
-l, --line-length NUM Set max encrypted line length for PFA output.\n\
-o, --output=FILE Write output to FILE.\n\
-h, --help Print this message and exit.\n\
--version Print version number and warranty and exit.\n\
\n\
Report bugs to <ekohler@gmail.com>.\n", program_name);
}
#ifdef __cplusplus
}
#endif
int main(int argc, char *argv[])
{
char *p, *q;
Clp_Parser *clp =
Clp_NewParser(argc, (const char * const *)argv, sizeof(options) / sizeof(options[0]), options);
program_name = Clp_ProgramName(clp);
/* interpret command line arguments using CLP */
while (1) {
int opt = Clp_Next(clp);
switch (opt) {
case BLOCK_LEN_OPT:
blocklen = clp->val.i;
break;
output_file:
case OUTPUT_OPT:
if (ofp)
fatal_error("output file already specified");
if (strcmp(clp->vstr, "-") == 0)
ofp = stdout;
else if (!(ofp = fopen(clp->vstr, "w")))
fatal_error("%s: %s", clp->vstr, strerror(errno));
break;
case PFB_OPT:
pfb = 1;
break;
case PFA_OPT:
pfb = 0;
break;
case HELP_OPT:
usage();
exit(0);
break;
case VERSION_OPT:
printf("t1asm (LCDF t1utils) %s\n", VERSION);
printf("Copyright (C) 1992-2017 I. Lee Hetherington, Eddie Kohler et al.\n\
This is free software; see the source for copying conditions.\n\
There is NO warranty, not even for merchantability or fitness for a\n\
particular purpose.\n");
exit(0);
break;
case Clp_NotOption:
if (ifp && ofp)
fatal_error("too many arguments");
else if (ifp)
goto output_file;
if (strcmp(clp->vstr, "-") == 0)
ifp = stdin;
else if (!(ifp = fopen(clp->vstr, "r")))
fatal_error("%s: %s", clp->vstr, strerror(errno));
break;
case Clp_Done:
goto done;
case Clp_BadOption:
short_usage();
exit(1);
break;
}
}
done:
if (!pfb) {
if (blocklen == -1)
blocklen = 64;
else if (blocklen < 8) {
blocklen = 8;
error("warning: line length raised to %d", blocklen);
} else if (blocklen > 1024) {
blocklen = 1024;
error("warning: line length lowered to %d", blocklen);
}
}
if (!ifp) ifp = stdin;
if (!ofp) ofp = stdout;
if (pfb)
init_pfb_writer(&w, blocklen, ofp);
#if defined(_MSDOS) || defined(_WIN32)
/* If we are processing a PFB (binary) output */
/* file, we must set its file mode to binary. */
_setmode(_fileno(ofp), _O_BINARY);
#endif
/* Finally, we loop until no more input. Some special things to look for are
the `currentfile eexec' line, the beginning of the `/Subrs' or
`/CharStrings' definition, the definition of `/lenIV', and the definition
of the charstring start command which has `...string currentfile...' in
it.
Being careful: Check with `/Subrs' and `/CharStrings' to see that a
number follows the token -- otherwise, the token is probably nested in a
subroutine a la Adobe Jenson, and we shouldn't pay attention to it.
Bugs: Occurrence of `/Subrs 9' in a comment will fool t1asm.
Thanks to Tom Kacvinsky <tjk@ams.org> who reported that some fonts come
without /Subrs sections and provided a patch. */
while (!feof(ifp) && !ferror(ifp)) {
t1utils_getline();
if (!ever_active) {
if (strncmp(line, "currentfile eexec", 17) == 0 && isspace((unsigned char) line[17])) {
/* Allow arbitrary whitespace after "currentfile eexec".
Thanks to Tom Kacvinsky <tjk@ams.org> for reporting this.
Note: strlen("currentfile eexec") == 17. */
for (p = line + 18; isspace((unsigned char) *p); p++)
;
eexec_start(p);
continue;
} else if (strncmp(line, "/lenIV", 6) == 0) {
set_lenIV(line, strlen(line));
} else if ((p = strstr(line, "string currentfile"))) {
set_cs_start(line, strlen(line));
}
}
if (!active) {
if ((p = strstr(line, "/Subrs")) && isdigit((unsigned char) p[7]))
ever_active = active = 1;
else if ((p = strstr(line, "/CharStrings")) && isdigit((unsigned char) p[13]))
ever_active = active = 1;
}
if ((p = strstr(line, "currentfile closefile"))) {
/* 2/14/99 -- happy Valentine's day! -- don't look for `mark
currentfile closefile'; the `mark' might be on a different line */
/* 1/3/2002 -- happy new year! -- Luc Devroye reports a failure with
some printers when `currentfile closefile' is followed by space */
p += sizeof("currentfile closefile") - 1;
for (q = p; isspace((unsigned char) *q) && *q != '\n'; q++)
/* nada */;
if (q == p && !*q)
error("warning: `currentfile closefile' line too long");
else if (q != p) {
if (*q != '\n')
error("text after `currentfile closefile' ignored");
*p++ = '\n';
*p++ = '\0';
}
eexec_string(line);
break;
}
eexec_string(line);
/* output line data */
if (start_charstring) {
if (!cs_start[0])
fatal_error("couldn't find charstring start command");
parse_charstring();
}
}
/* Handle remaining PostScript after the eexec section */
if (in_eexec)
eexec_end();
/* There may be additional code. */
while (!feof(ifp) && !ferror(ifp)) {
t1utils_getline();
eexec_string(line);
}
if (pfb)
pfb_writer_end(&w);
/* the end! */
if (!ever_active)
error("warning: no charstrings found in input file");
fclose(ifp);
fclose(ofp);
return 0;
}
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