diff options
Diffstat (limited to 'Build/source/utils/t1utils/t1disasm.c')
-rw-r--r-- | Build/source/utils/t1utils/t1disasm.c | 777 |
1 files changed, 777 insertions, 0 deletions
diff --git a/Build/source/utils/t1utils/t1disasm.c b/Build/source/utils/t1utils/t1disasm.c new file mode 100644 index 00000000000..21dc659cb01 --- /dev/null +++ b/Build/source/utils/t1utils/t1disasm.c @@ -0,0 +1,777 @@ +/* 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. + * + * Permission is hereby granted to use, modify, and distribute this program + * for any purpose provided this copyright notice and the one below remain + * intact. + * + * I. Lee Hetherington (ilh@lcs.mit.edu) + * + * 1.5 and later versions contain changes by, and are maintained by, + * Eddie Kohler <kohler@icir.org>. + * + * 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 <lcdf/clp.h> +#include "t1lib.h" + +#ifdef __cplusplus +extern "C" { +#endif + +typedef unsigned char byte; + +static FILE *ofp; +static int lenIV = 4; +static char cs_start[10]; +static int unknown = 0; + +/* decryption stuff */ +static uint16_t c1 = 52845, c2 = 22719; +static uint16_t cr_default = 4330; +static uint16_t er_default = 55665; + +static int error_count = 0; +void fatal_error(const char *message, ...); +void error(const char *message, ...); + +/* If the line contains an entry of the form `/lenIV <num>' then set the global + lenIV to <num>. This indicates the number of random bytes at the beginning + of each charstring. */ + +static void +set_lenIV(char *line) +{ + char *p = strstr(line, "/lenIV "); + + /* Allow lenIV to be negative. Thanks to Tom Kacvinsky <tjk@ams.org> */ + if (p && (isdigit(p[7]) || p[7] == '+' || p[7] == '-')) { + lenIV = atoi(p + 7); + } +} + +static void +set_cs_start(char *line) +{ + char *p, *q, *r; + + if ((p = strstr(line, "string currentfile"))) { + /* enforce presence of `readstring' -- 5/29/99 */ + if (!strstr(line, "readstring")) + return; + /* locate the name of the charstring start command */ + *p = '\0'; /* damage line[] */ + q = strrchr(line, '/'); + if (q) { + r = cs_start; + ++q; + while (!isspace(*q) && *q != '{') + *r++ = *q++; + *r = '\0'; + } + *p = 's'; /* repair line[] */ + } +} + +/* 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 { + val = (line[i+1] & 0xff) << 24; + val |= (line[i+2] & 0xff) << 16; + val |= (line[i+3] & 0xff) << 8; + val |= (line[i+4] & 0xff) << 0; + /* in case an int32 is larger than four bytes---sign extend */ +#if INT_MAX > 0x7FFFFFFFUL + if (val & 0x80000000) + val |= ~0x7FFFFFFF; +#endif + 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(unsigned char *line, int len) +{ + 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; +} + +/* 23.Feb.2004 - use 'memstr', not strstr, because the strings input to + eexec_line aren't null terminated! Reported by Werner Lemberg. */ + +static const char * +oog_memstr(const char *line, int line_len, const char *pattern, int pattern_len) +{ + const char *try; + const char *last = line + line_len - pattern_len + 1; + while (line < last + && (try = memchr(line, (unsigned char)*pattern, last - line))) { + if (memcmp(try, pattern, pattern_len) == 0) + return try; + else + line = try + 1; + } + return 0; +} + +/* 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; + } + + 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); + save_len = 0; + return cut_newline; + } else { + /* not long enough! */ + if (line != save) + 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. */ + { + const char *CharStrings = oog_memstr(line, line_len, "/CharStrings ", 13); + int crap, n; + char should_be_slash = 0; + if (CharStrings + && sscanf(CharStrings + 12, " %d dict dup begin %c%n", &crap, &should_be_slash, &n) >= 2 + && should_be_slash == '/') { + int len = (CharStrings + 12 + n - 1) - (char *) line; + fprintf(ofp, "%.*s\n", len, line); + return eexec_line((unsigned char *) (CharStrings + 12 + n - 1), line_len - len); + } + } + + if (line[line_len - 1] == '\r') { + line[line_len - 1] = '\n'; + cut_newline = 1; + } + set_lenIV((char *)line); + set_cs_start((char *)line); + fprintf(ofp, "%.*s", line_len, line); + save_len = 0; + + /* look for `currentfile closefile' to see if we should stop decrypting */ + if (oog_memstr(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) + eexec_line("", 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() +{ + /* 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_ArgString, 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); + 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++; +} + +void +short_usage(void) +{ + fprintf(stderr, "Usage: %s [INPUT [OUTPUT]]\n\ +Try `%s --help' for more information.\n", + program_name, program_name); +} + +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 <kohler@icir.org>.\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->arg, "-") == 0) + ofp = stdout; + else { + ofp = fopen(clp->arg, "w"); + if (!ofp) fatal_error("%s: %s", clp->arg, strerror(errno)); + } + break; + + case HELP_OPT: + usage(); + exit(0); + break; + + case VERSION_OPT: + printf("t1disasm (LCDF t1utils) %s\n", VERSION); + printf("Copyright (C) 1992-2003 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->arg, "-") == 0) + ifp = stdin; + else { + ifp_filename = clp->arg; + ifp = fopen(clp->arg, "rb"); + if (!ifp) fatal_error("%s: %s", clp->arg, 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); +} |