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// -*- related-file-name: "../include/efont/t1cs.hh" -*-
/* t1cs.{cc,hh} -- Type 1/2 charstrings
*
* Copyright (c) 1998-2006 Eddie Kohler
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version. This program is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <efont/t1cs.hh>
#include <efont/t1interp.hh>
#include <string.h>
namespace Efont {
const char * const Charstring::command_names[] = {
"error", "hstem", "UNKNOWN_2", "vstem", "vmoveto",
"rlineto", "hlineto", "vlineto", "rrcurveto", "closepath",
"callsubr", "return", "escape", "hsbw", "endchar",
"UNKNOWN_15", "blend", "UNKNOWN_17", "hstemhm", "hintmask",
"cntrmask", "rmoveto", "hmoveto", "vstemhm", "rcurveline",
"rlinecurve", "vvcurveto", "hhcurveto", "shortint", "callgsubr",
"vhcurveto", "hvcurveto", "dotsection", "vstem3", "hstem3",
"and", "or", "not", "seac", "sbw",
"store", "abs", "add", "sub", "div",
"load", "neg", "eq", "callothersubr", "pop",
"drop", "UNKNOWN_12_19", "put", "get", "ifelse",
"random", "mul", "UNKNOWN_12_25", "sqrt", "dup",
"exch", "index", "roll", "UNKNOWN_12_31", "UNKNOWN_12_32",
"setcurrentpoint", "hflex", "flex", "hflex1", "flex1"
};
const char * const Charstring::standard_encoding[256] = {
/* 00x */ 0, 0, 0, 0, 0, 0, 0, 0,
/* 01x */ 0, 0, 0, 0, 0, 0, 0, 0,
/* 02x */ 0, 0, 0, 0, 0, 0, 0, 0,
/* 03x */ 0, 0, 0, 0, 0, 0, 0, 0,
/* 04x */ "space", "exclam", "quotedbl", "numbersign", "dollar", "percent",
"ampersand", "quoteright",
/* 05x */ "parenleft", "parenright", "asterisk", "plus", "comma", "hyphen",
"period", "slash",
/* 06x */ "zero", "one", "two", "three", "four", "five", "six", "seven",
/* 07x */ "eight", "nine", "colon", "semicolon", "less", "equal",
"greater", "question",
/* 10x */ "at", "A", "B", "C", "D", "E", "F", "G",
/* 11x */ "H", "I", "J", "K", "L", "M", "N", "O",
/* 12x */ "P", "Q", "R", "S", "T", "U", "V", "W",
/* 13x */ "X", "Y", "Z", "bracketleft", "backslash", "bracketright",
"asciicircum", "underscore",
/* 14x */ "quoteleft", "a", "b", "c", "d", "e", "f", "g",
/* 15x */ "h", "i", "j", "k", "l", "m", "n", "o",
/* 16x */ "p", "q", "r", "s", "t", "u", "v", "w",
/* 17x */ "x", "y", "z", "braceleft", "bar", "braceright", "asciitilde", 0,
/* 20x */ 0, 0, 0, 0, 0, 0, 0, 0,
/* 21x */ 0, 0, 0, 0, 0, 0, 0, 0,
/* 22x */ 0, 0, 0, 0, 0, 0, 0, 0,
/* 23x */ 0, 0, 0, 0, 0, 0, 0, 0,
/* 24x */ 0, "exclamdown", "cent", "sterling", "fraction", "yen",
"florin", "section",
/* 25x */ "currency", "quotesingle", "quotedblleft", "guillemotleft",
"guilsinglleft", "guilsinglright", "fi", "fl",
/* 26x */ 0, "endash", "dagger", "daggerdbl", "periodcentered", 0,
"paragraph", "bullet",
/* 27x */ "quotesinglbase", "quotedblbase", "quotedblright",
"guillemotright", "ellipsis", "perthousand", 0, "questiondown",
/* 30x */ 0, "grave", "acute", "circumflex", "tilde", "macron",
"breve", "dotaccent",
/* 31x */ "dieresis", 0, "ring", "cedilla", 0, "hungarumlaut",
"ogonek", "caron",
/* 32x */ "emdash", 0, 0, 0, 0, 0, 0, 0,
/* 33x */ 0, 0, 0, 0, 0, 0, 0, 0,
/* 34x */ 0, "AE", 0, "ordfeminine", 0, 0, 0, 0,
/* 35x */ "Lslash", "Oslash", "OE", "ordmasculine", 0, 0, 0, 0,
/* 36x */ 0, "ae", 0, 0, 0, "dotlessi", 0, 0,
/* 37x */ "lslash", "oslash", "oe", "germandbls", 0, 0, 0, 0,
};
Charstring::~Charstring()
{
}
String
Charstring::command_name(int cmd)
{
if (cmd >= 0 && cmd <= cLastCommand)
return command_names[cmd];
else if (cmd < cEscapeDelta + 256)
return String("COMMAND_12_") + String(cmd - cEscapeDelta);
else
return String("<INVALID>");
}
Type1Charstring::Type1Charstring(int lenIV, const String &s)
: Charstring(), _key(-1)
{
if (lenIV < 0) // no charstring encryption
_s = s;
else if (lenIV < s.length()) {
const unsigned char *d = reinterpret_cast<const unsigned char*>(s.data());
_key = t1R_cs;
for (int i = 0; i < lenIV; i++, d++)
_key = ((*d + _key) * t1C1 + t1C2) & 0xFFFF;
_s = s.substring(lenIV);
}
}
void
Type1Charstring::prepend(const Type1Charstring &t1cs)
{
if (_key >= 0)
decrypt();
if (t1cs._key >= 0)
t1cs.decrypt();
_s = t1cs._s + _s;
}
void
Type1Charstring::decrypt() const
{
if (_key >= 0) {
int r = _key;
uint8_t *d = reinterpret_cast<uint8_t *>(_s.mutable_data());
for (int i = 0; i < _s.length(); i++, d++) {
uint8_t encrypted = *d;
*d = encrypted ^ (r >> 8);
r = ((encrypted + r) * t1C1 + t1C2) & 0xFFFF;
}
_key = -1;
}
}
bool
Type1Charstring::process(CharstringInterp &interp) const
{
const uint8_t *data = Type1Charstring::data();
int left = _s.length();
while (left > 0) {
bool more;
int ahead;
if (*data >= 32 && *data <= 246) { // push small number
more = interp.number(data[0] - 139);
ahead = 1;
} else if (*data < 32) { // a command
if (*data == cEscape) {
if (left < 2)
goto runoff_error;
more = interp.type1_command(cEscapeDelta + data[1]);
ahead = 2;
} else if (*data == cShortint) { // short integer
if (left < 3)
goto runoff_error;
int16_t val = (data[1] << 8) | data[2];
more = interp.number(val);
ahead = 3;
} else {
more = interp.type1_command(data[0]);
ahead = 1;
}
} else if (*data >= 247 && *data <= 250) { // push medium number
if (left < 2)
goto runoff_error;
int val = + ((data[0] - 247) << 8) + 108 + data[1];
more = interp.number(val);
ahead = 2;
} else if (*data >= 251 && *data <= 254) { // push negative medium number
if (left < 2)
goto runoff_error;
int val = - ((data[0] - 251) << 8) - 108 - data[1];
more = interp.number(val);
ahead = 2;
} else { // 255: push huge number
if (left < 5)
goto runoff_error;
int32_t val = (data[1] << 24) | (data[2] << 16) | (data[3] << 8) | data[4];
more = interp.number(val);
ahead = 5;
}
if (!more)
return interp.error() == CharstringInterp::errOK;
data += ahead;
left -= ahead;
}
runoff_error:
interp.error(CharstringInterp::errRunoff);
return false;
}
int
Type1Charstring::first_caret_after(int pos) const
{
const uint8_t *data = Type1Charstring::data();
const uint8_t *edata = data + (pos < length() ? pos : length());
while (data < edata) {
if (*data >= 32 && *data <= 246) // push small number
data++;
else if (*data < 32) { // a command
if (*data == cEscape)
data += 2;
else if (*data == cShortint)
data += 3;
else
data++;
} else if (*data >= 247 && *data <= 254) // push medium number
data += 2;
else // 255: push huge number
data += 5;
}
const uint8_t *odata = Type1Charstring::data();
return (data > odata + length() ? length() : data - odata);
}
void
Type1Charstring::assign_substring(int pos, int len, const String &cs)
{
if (_key >= 0)
decrypt();
if (pos < 0 || len < 0 || pos + len >= _s.length())
/* do nothing */;
else if (cs.length() == len) {
char *d = _s.mutable_data();
memcpy(d + pos, cs.data(), cs.length());
} else if (cs.length() <= len) {
char *d = _s.mutable_data();
memcpy(d + pos, cs.data(), cs.length());
memmove(d + pos + cs.length(), d + pos + len, _s.length() - pos - len);
_s = _s.substring(0, cs.length() - len);
} else
_s = _s.substring(0, pos) + cs + _s.substring(pos + len);
}
bool
Type2Charstring::process(CharstringInterp &interp) const
{
const uint8_t *data = Type2Charstring::data();
int left = _s.length();
while (left > 0) {
bool more;
int ahead;
if (*data >= 32 && *data <= 246) { // push small number
more = interp.number(data[0] - 139);
ahead = 1;
} else if (*data < 32) { // a command
if (*data == cEscape) {
if (left < 2)
goto runoff_error;
more = interp.type2_command(cEscapeDelta + data[1], 0, 0);
ahead = 2;
} else if (*data == cShortint) { // short integer
if (left < 3)
goto runoff_error;
int16_t val = (data[1] << 8) | data[2];
more = interp.number(val);
ahead = 3;
} else if (*data == cHintmask || *data == cCntrmask) {
int left_ptr = left - 1;
more = interp.type2_command(data[0], data + 1, &left_ptr);
ahead = 1 + (left - 1) - left_ptr;
} else {
more = interp.type2_command(data[0], 0, 0);
ahead = 1;
}
} else if (*data >= 247 && *data <= 250) { // push medium number
if (left < 2)
goto runoff_error;
int val = + ((data[0] - 247) << 8) + 108 + data[1];
more = interp.number(val);
ahead = 2;
} else if (*data >= 251 && *data <= 254) { // push negative medium number
if (left < 2)
goto runoff_error;
int val = - ((data[0] - 251) << 8) - 108 - data[1];
more = interp.number(val);
ahead = 2;
} else { // 255: push huge number
if (left < 5)
goto runoff_error;
int32_t val = (data[1] << 24) | (data[2] << 16) | (data[3] << 8) | data[4];
more = interp.number(val / 65536.);
ahead = 5;
}
if (!more)
return interp.error() == CharstringInterp::errOK;
data += ahead;
left -= ahead;
}
runoff_error:
interp.error(CharstringInterp::errRunoff);
return false;
}
const CharstringProgram *
CharstringProgram::child_program(int) const
{
return this;
}
void
CharstringProgram::font_matrix(double matrix[6]) const
{
matrix[0] = matrix[3] = 0.001;
matrix[1] = matrix[2] = matrix[4] = matrix[5] = 0;
}
int
CharstringProgram::units_per_em() const
{
return 1000;
}
void
CharstringProgram::glyph_names(Vector<PermString> &gnames) const
{
int n = nglyphs();
gnames.resize(n);
for (int i = 0; i < n; i++)
gnames[i] = glyph_name(i);
}
Vector<double> *
CharstringProgram::mm_vector(VectorType, bool) const
{
return 0;
}
double
CharstringProgram::global_width_x(bool) const
{
return UNKDOUBLE;
}
}
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