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/* t1disasm
*
* This program `disassembles' Adobe Type-1 font programs in either PFB or PFA
* format. It produces a human readable/editable pseudo-PostScript file by
* performing eexec and charstring decryption as specified in the `Adobe Type 1
* Font Format' version 1.1 (the `black book'). There is a companion program,
* t1asm, which `assembles' such a pseudo-PostScript file into either PFB or
* PFA format.
*
* 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 10:55:08 ilh
* Added support for additional PostScript after the closefile command
* (ie., some fonts have {restore}if' after the cleartomark). Also,
* removed hardwired charstring start command (-| or RD) in favor of
* automatically determining it.
*
* Revision 1.3 92/06/23 10:57:53 ilh
* MSDOS porting by Kai-Uwe Herbing (herbing@netmbx.netmbx.de)
* incoporated.
*
* Revision 1.2 92/05/22 12:05:33 ilh
* Fixed bug where we were counting on sprintf to return its first
* argument---not true in ANSI C. This bug was detected by Piet
* Tutelaers (rcpt@urc.tue.nl). Also, fixed (signed) integer overflow
* error when testing high-order bit of integer for possible
* sign-extension by making comparison between unsigned integers.
*
* Revision 1.1 92/05/22 12:04:07 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 <assert.h>
#include <lcdf/clp.h>
#include "t1lib.h"
#include "t1asmhelp.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef unsigned char byte;
static FILE *ofp;
static int unknown = 0;
/* decryption stuff */
static const uint32_t c1 = 52845;
static const uint32_t c2 = 22719;
static uint16_t cr_default = 4330;
static uint16_t er_default = 55665;
static int error_count = 0;
/* Subroutine to output strings. */
static void
output(const char *string)
{
fprintf(ofp, "%s", string);
}
/* Subroutine to neatly format output of charstring tokens. If token = "\n",
then a newline is output. If at start of line (start == 1), prefix token
with tab, otherwise a space. */
static void
output_token(const char *token)
{
static int start = 1;
if (strcmp(token, "\n") == 0) {
fprintf(ofp, "\n");
start = 1;
} else {
fprintf(ofp, "%s%s", start ? "\t" : " ", token);
start = 0;
}
}
/* Subroutine to decrypt and ASCII-ify tokens in charstring data. The
charstring decryption machinery is fired up, skipping the first lenIV
bytes, and the decrypted tokens are expanded into human-readable form. */
static void
decrypt_charstring(unsigned char *line, int len)
{
int i;
int32_t val;
char buf[20];
/* decrypt charstring */
if (lenIV >= 0) {
/* only decrypt if lenIV >= 0 -- negative lenIV means unencrypted
charstring. Thanks to Tom Kacvinsky <tjk@ams.org> */
uint16_t cr = cr_default;
byte plain;
for (i = 0; i < len; i++) {
byte cipher = line[i];
plain = (byte)(cipher ^ (cr >> 8));
cr = (uint16_t)((cipher + cr) * c1 + c2);
line[i] = plain;
}
line += lenIV;
len -= lenIV;
}
/* handle each charstring command */
for (i = 0; i < len; i++) {
byte b = line[i];
if (b >= 32) {
if (b >= 32 && b <= 246)
val = b - 139;
else if (b >= 247 && b <= 250) {
i++;
val = (b - 247)*256 + 108 + line[i];
} else if (b >= 251 && b <= 254) {
i++;
val = -(b - 251)*256 - 108 - line[i];
} else {
uint32_t uval;
uval = (uint32_t) line[i+1] << 24;
uval |= (uint32_t) line[i+2] << 16;
uval |= (uint32_t) line[i+3] << 8;
uval |= (uint32_t) line[i+4] << 0;
/* in case an int32 is larger than four bytes---sign extend */
#if INT_MAX > 0x7FFFFFFFUL
if (uval & 0x80000000U)
uval |= ~0x7FFFFFFFU;
#endif
val = (int32_t) uval;
i += 4;
}
sprintf(buf, "%d", val);
output_token(buf);
} else {
switch (b) {
case 0: output_token("error"); break; /* special */
case 1: output_token("hstem"); break;
case 3: output_token("vstem"); break;
case 4: output_token("vmoveto"); break;
case 5: output_token("rlineto"); break;
case 6: output_token("hlineto"); break;
case 7: output_token("vlineto"); break;
case 8: output_token("rrcurveto"); break;
case 9: output_token("closepath"); break; /* Type 1 ONLY */
case 10: output_token("callsubr"); break;
case 11: output_token("return"); break;
case 13: output_token("hsbw"); break; /* Type 1 ONLY */
case 14: output_token("endchar"); break;
case 16: output_token("blend"); break; /* Type 2 */
case 18: output_token("hstemhm"); break; /* Type 2 */
case 19: output_token("hintmask"); break; /* Type 2 */
case 20: output_token("cntrmask"); break; /* Type 2 */
case 21: output_token("rmoveto"); break;
case 22: output_token("hmoveto"); break;
case 23: output_token("vstemhm"); break; /* Type 2 */
case 24: output_token("rcurveline"); break; /* Type 2 */
case 25: output_token("rlinecurve"); break; /* Type 2 */
case 26: output_token("vvcurveto"); break; /* Type 2 */
case 27: output_token("hhcurveto"); break; /* Type 2 */
case 28: { /* Type 2 */
/* short integer */
val = (line[i+1] & 0xff) << 8;
val |= (line[i+2] & 0xff);
i += 2;
if (val & 0x8000)
val |= ~0x7FFF;
sprintf(buf, "%d", val);
output_token(buf);
}
case 29: output_token("callgsubr"); break; /* Type 2 */
case 30: output_token("vhcurveto"); break;
case 31: output_token("hvcurveto"); break;
case 12:
i++;
b = line[i];
switch (b) {
case 0: output_token("dotsection"); break; /* Type 1 ONLY */
case 1: output_token("vstem3"); break; /* Type 1 ONLY */
case 2: output_token("hstem3"); break; /* Type 1 ONLY */
case 3: output_token("and"); break; /* Type 2 */
case 4: output_token("or"); break; /* Type 2 */
case 5: output_token("not"); break; /* Type 2 */
case 6: output_token("seac"); break; /* Type 1 ONLY */
case 7: output_token("sbw"); break; /* Type 1 ONLY */
case 8: output_token("store"); break; /* Type 2 */
case 9: output_token("abs"); break; /* Type 2 */
case 10: output_token("add"); break; /* Type 2 */
case 11: output_token("sub"); break; /* Type 2 */
case 12: output_token("div"); break;
case 13: output_token("load"); break; /* Type 2 */
case 14: output_token("neg"); break; /* Type 2 */
case 15: output_token("eq"); break; /* Type 2 */
case 16: output_token("callothersubr"); break; /* Type 1 ONLY */
case 17: output_token("pop"); break; /* Type 1 ONLY */
case 18: output_token("drop"); break; /* Type 2 */
case 20: output_token("put"); break; /* Type 2 */
case 21: output_token("get"); break; /* Type 2 */
case 22: output_token("ifelse"); break; /* Type 2 */
case 23: output_token("random"); break; /* Type 2 */
case 24: output_token("mul"); break; /* Type 2 */
case 26: output_token("sqrt"); break; /* Type 2 */
case 27: output_token("dup"); break; /* Type 2 */
case 28: output_token("exch"); break; /* Type 2 */
case 29: output_token("index"); break; /* Type 2 */
case 30: output_token("roll"); break; /* Type 2 */
case 33: output_token("setcurrentpoint"); break;/* Type 1 ONLY */
case 34: output_token("hflex"); break; /* Type 2 */
case 35: output_token("flex"); break; /* Type 2 */
case 36: output_token("hflex1"); break; /* Type 2 */
case 37: output_token("flex1"); break; /* Type 2 */
default:
sprintf(buf, "escape_%d", b);
unknown++;
output_token(buf);
break;
}
break;
default:
sprintf(buf, "UNKNOWN_%d", b);
unknown++;
output_token(buf);
break;
}
output_token("\n");
}
}
if (i > len) {
output("\terror\n");
error("disassembly error: charstring too short");
}
}
/* Disassembly font_reader functions */
static int in_eexec = 0;
static unsigned char *save = 0;
static int save_len = 0;
static int save_cap = 0;
static void
append_save(const unsigned char *line, int len)
{
if (line == save) {
assert(len <= save_cap);
save_len = len;
return;
}
if (save_len + len >= save_cap) {
unsigned char *new_save;
if (!save_cap) save_cap = 1024;
while (save_len + len >= save_cap) save_cap *= 2;
new_save = (unsigned char *)malloc(save_cap);
if (!new_save)
fatal_error("out of memory");
memcpy(new_save, save, save_len);
free(save);
save = new_save;
}
memcpy(save + save_len, line, len);
save_len += len;
}
static unsigned char*
check_eexec_charstrings_begin(unsigned char* line, int line_len)
{
unsigned char* line_end = line + line_len;
line = memmem(line, line_len, "/CharStrings ", 13);
if (!line)
return 0;
line += 13;
while (line < line_end && isspace(*line))
++line;
if (line == line_end || !isdigit(*line))
return 0;
while (line < line_end && isdigit(*line))
++line;
if (line == line_end || !isspace(*line))
return 0;
while (line < line_end && isspace(*line))
++line;
if (line_end - line < 14 || memcmp(line, "dict dup begin", 14) != 0)
return 0;
line += 14;
while (line < line_end && isspace(*line))
++line;
if (line == line_end || *line != '/')
return 0;
return line;
}
/* returns 1 if next \n should be deleted */
static int
eexec_line(unsigned char *line, int line_len)
{
int cs_start_len = strlen(cs_start);
int pos;
int first_space;
int digits;
int cut_newline = 0;
/* append this data to the end of `save' if necessary */
if (save_len) {
append_save(line, line_len);
line = save;
line_len = save_len;
save_len = 0;
}
if (!line_len)
return 0;
/* Look for charstring start */
/* skip first word */
for (pos = 0; pos < line_len && isspace(line[pos]); pos++)
;
while (pos < line_len && !isspace(line[pos]))
pos++;
if (pos >= line_len)
goto not_charstring;
/* skip spaces */
first_space = pos;
while (pos < line_len && isspace(line[pos]))
pos++;
if (pos >= line_len || !isdigit(line[pos]))
goto not_charstring;
/* skip number */
digits = pos;
while (pos < line_len && isdigit(line[pos]))
pos++;
/* check for subr (another number) */
if (pos < line_len - 1 && isspace(line[pos]) && isdigit(line[pos+1])) {
first_space = pos;
digits = pos + 1;
for (pos = digits; pos < line_len && isdigit(line[pos]); pos++)
;
}
/* check for charstring start */
if (pos + 2 + cs_start_len < line_len
&& pos > digits
&& line[pos] == ' '
&& strncmp((const char *)(line + pos + 1), cs_start, cs_start_len) == 0
&& line[pos + 1 + cs_start_len] == ' ') {
/* check if charstring is long enough */
int cs_len = atoi((const char *)(line + digits));
if (pos + 2 + cs_start_len + cs_len < line_len) {
/* long enough! */
if (line[line_len - 1] == '\r') {
line[line_len - 1] = '\n';
cut_newline = 1;
}
fprintf(ofp, "%.*s {\n", first_space, line);
decrypt_charstring(line + pos + 2 + cs_start_len, cs_len);
pos += 2 + cs_start_len + cs_len;
fprintf(ofp, "\t}%.*s", line_len - pos, line + pos);
return cut_newline;
} else {
/* not long enough! */
append_save(line, line_len);
return 0;
}
}
/* otherwise, just output the line */
not_charstring:
/* 6.Oct.2003 - Werner Lemberg reports a stupid Omega font that behaves
badly: a charstring definition follows "/Charstrings ... begin", ON THE
SAME LINE. */
{
unsigned char* csbegin = check_eexec_charstrings_begin(line, line_len);
if (csbegin) {
int len = csbegin - line;
fprintf(ofp, "%.*s\n", len, line);
return eexec_line(csbegin, line_len - len);
}
}
if (line[line_len - 1] == '\r') {
line[line_len - 1] = '\n';
cut_newline = 1;
}
set_lenIV((char*) line, line_len);
set_cs_start((char*) line, line_len);
fprintf(ofp, "%.*s", line_len, line);
/* look for `currentfile closefile' to see if we should stop decrypting */
if (memmem(line, line_len, "currentfile closefile", 21) != 0)
in_eexec = -1;
return cut_newline;
}
static int
all_zeroes(const char *string)
{
if (*string != '0')
return 0;
while (*string == '0')
string++;
return *string == '\0' || *string == '\n';
}
static void
disasm_output_ascii(char *line, int len)
{
int was_in_eexec = in_eexec;
(void) len; /* avoid warning */
in_eexec = 0;
/* if we came from a binary section, we need to process that too */
if (was_in_eexec > 0) {
unsigned char zero = 0;
eexec_line(&zero, 0);
}
/* if we just came from the "ASCII part" of an eexec section, we need to
process the saved lines */
if (was_in_eexec < 0) {
int i = 0;
int save_char = 0; /* note: save[] is unsigned char * */
while (i < save_len) {
/* grab a line */
int start = i;
while (i < save_len && save[i] != '\r' && save[i] != '\n')
i++;
if (i < save_len) {
if (i < save_len - 1 && save[i] == '\r' && save[i+1] == '\n')
save_char = -1;
else
save_char = save[i+1];
save[i] = '\n';
save[i+1] = 0;
} else
save[i] = 0;
/* output it */
disasm_output_ascii((char *)(save + start), -1);
/* repair damage */
if (i < save_len) {
if (save_char >= 0) {
save[i+1] = save_char;
i++;
} else
i += 2;
}
}
save_len = 0;
}
if (!all_zeroes(line))
output(line);
}
/* collect until '\n' or end of binary section */
static void
disasm_output_binary(unsigned char *data, int len)
{
static int ignore_newline;
static uint16_t er;
byte plain;
int i;
/* in the ASCII portion of a binary section, just save this data */
if (in_eexec < 0) {
append_save(data, len);
return;
}
/* eexec initialization */
if (in_eexec == 0) {
er = er_default;
ignore_newline = 0;
in_eexec = 0;
}
if (in_eexec < 4) {
for (i = 0; i < len && in_eexec < 4; i++, in_eexec++) {
byte cipher = data[i];
plain = (byte)(cipher ^ (er >> 8));
er = (uint16_t)((cipher + er) * c1 + c2);
data[i] = plain;
}
data += i;
len -= i;
}
/* now make lines: collect until '\n' or '\r' and pass them off to
eexec_line. */
i = 0;
while (in_eexec > 0) {
int start = i;
for (; i < len; i++) {
byte cipher = data[i];
plain = (byte)(cipher ^ (er >> 8));
er = (uint16_t)((cipher + er) * c1 + c2);
data[i] = plain;
if (plain == '\r' || plain == '\n')
break;
}
if (ignore_newline && start < i && data[start] == '\n') {
ignore_newline = 0;
continue;
}
if (i >= len) {
if (start < len)
append_save(data + start, i - start);
break;
}
i++;
ignore_newline = eexec_line(data + start, i - start);
}
/* if in_eexec < 0, we have some plaintext lines sitting around in a binary
section of the PFB. save them for later */
if (in_eexec < 0 && i < len)
append_save(data + i, len - i);
}
static void
disasm_output_end(void)
{
/* take care of leftover saved data */
static char crap[1] = "";
disasm_output_ascii(crap, 0);
}
/*****
* Command line
**/
#define OUTPUT_OPT 301
#define VERSION_OPT 302
#define HELP_OPT 303
static Clp_Option options[] = {
{ "help", 0, HELP_OPT, 0, 0 },
{ "output", 'o', OUTPUT_OPT, Clp_ValString, 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);
fputc('\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);
fputc('\n', stderr);
error_count++;
va_end(val);
}
static void
short_usage(void)
{
fprintf(stderr, "Usage: %s [INPUT [OUTPUT]]\n\
Try `%s --help' for more information.\n",
program_name, program_name);
}
static void
usage(void)
{
printf("\
`T1disasm' translates a PostScript Type 1 font in PFB or PFA format into a\n\
human-readable, human-editable form. The result is written to the standard\n\
output unless an OUTPUT file is given.\n\
\n\
Usage: %s [OPTION]... [INPUT [OUTPUT]]\n\
\n\
Options:\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[])
{
struct font_reader fr;
int c;
FILE *ifp = 0;
const char *ifp_filename = "<stdin>";
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) {
output_file:
case OUTPUT_OPT:
if (ofp)
fatal_error("output file already specified");
if (strcmp(clp->vstr, "-") == 0)
ofp = stdout;
else {
ofp = fopen(clp->vstr, "w");
if (!ofp) fatal_error("%s: %s", clp->vstr, strerror(errno));
}
break;
case HELP_OPT:
usage();
exit(0);
break;
case VERSION_OPT:
printf("t1disasm (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 {
ifp_filename = clp->vstr;
ifp = fopen(clp->vstr, "rb");
if (!ifp) fatal_error("%s: %s", clp->vstr, strerror(errno));
}
break;
case Clp_Done:
goto done;
case Clp_BadOption:
short_usage();
exit(1);
break;
}
}
done:
if (!ifp) ifp = stdin;
if (!ofp) ofp = stdout;
#if defined(_MSDOS) || defined(_WIN32)
/* As we might be processing a PFB (binary) input file, we must set its file
mode to binary. */
_setmode(_fileno(ifp), _O_BINARY);
#endif
/* prepare font reader */
fr.output_ascii = disasm_output_ascii;
fr.output_binary = disasm_output_binary;
fr.output_end = disasm_output_end;
/* peek at first byte to see if it is the PFB marker 0x80 */
c = getc(ifp);
ungetc(c, ifp);
/* do the file */
if (c == PFB_MARKER)
process_pfb(ifp, ifp_filename, &fr);
else if (c == '%')
process_pfa(ifp, ifp_filename, &fr);
else
fatal_error("%s does not start with font marker (`%%' or 0x80)", ifp_filename);
fclose(ifp);
fclose(ofp);
if (unknown)
error((unknown > 1
? "encountered %d unknown charstring commands"
: "encountered %d unknown charstring command"),
unknown);
return (error_count ? 1 : 0);
}
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