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okular/xpdf/GfxFont.cc

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//========================================================================
//
// GfxFont.cc
//
// Copyright 1996-2003 Glyph & Cog, LLC
//
//========================================================================
#include <aconf.h>
#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "gmem.h"
#include "Error.h"
#include "Object.h"
#include "Dict.h"
#include "GlobalParams.h"
#include "CMap.h"
#include "CharCodeToUnicode.h"
#include "FontEncodingTables.h"
#include "BuiltinFontTables.h"
#include "FoFiType1.h"
#include "FoFiType1C.h"
#include "FoFiTrueType.h"
#include "GfxFont.h"
//------------------------------------------------------------------------
struct StdFontMapEntry {
const char *altName;
const char *properName;
};
// Acrobat 4.0 and earlier substituted Base14-compatible fonts without
// providing Widths and a FontDescriptor, so we munge the names into
// the proper Base14 names. This table is from implementation note 44
// in the PDF 1.4 spec, with some additions based on empirical
// evidence.
static StdFontMapEntry stdFontMap[] = {
{ "Arial", "Helvetica" },
{ "Arial,Bold", "Helvetica-Bold" },
{ "Arial,BoldItalic", "Helvetica-BoldOblique" },
{ "Arial,Italic", "Helvetica-Oblique" },
{ "Arial-Bold", "Helvetica-Bold" },
{ "Arial-BoldItalic", "Helvetica-BoldOblique" },
{ "Arial-BoldItalicMT", "Helvetica-BoldOblique" },
{ "Arial-BoldMT", "Helvetica-Bold" },
{ "Arial-Italic", "Helvetica-Oblique" },
{ "Arial-ItalicMT", "Helvetica-Oblique" },
{ "ArialMT", "Helvetica" },
{ "Courier,Bold", "Courier-Bold" },
{ "Courier,Italic", "Courier-Oblique" },
{ "Courier,BoldItalic", "Courier-BoldOblique" },
{ "CourierNew", "Courier" },
{ "CourierNew,Bold", "Courier-Bold" },
{ "CourierNew,BoldItalic", "Courier-BoldOblique" },
{ "CourierNew,Italic", "Courier-Oblique" },
{ "CourierNew-Bold", "Courier-Bold" },
{ "CourierNew-BoldItalic", "Courier-BoldOblique" },
{ "CourierNew-Italic", "Courier-Oblique" },
{ "CourierNewPS-BoldItalicMT", "Courier-BoldOblique" },
{ "CourierNewPS-BoldMT", "Courier-Bold" },
{ "CourierNewPS-ItalicMT", "Courier-Oblique" },
{ "CourierNewPSMT", "Courier" },
{ "Helvetica,Bold", "Helvetica-Bold" },
{ "Helvetica,BoldItalic", "Helvetica-BoldOblique" },
{ "Helvetica,Italic", "Helvetica-Oblique" },
{ "Helvetica-BoldItalic", "Helvetica-BoldOblique" },
{ "Helvetica-Italic", "Helvetica-Oblique" },
{ "Symbol,Bold", "Symbol" },
{ "Symbol,BoldItalic", "Symbol" },
{ "Symbol,Italic", "Symbol" },
{ "TimesNewRoman", "Times-Roman" },
{ "TimesNewRoman,Bold", "Times-Bold" },
{ "TimesNewRoman,BoldItalic", "Times-BoldItalic" },
{ "TimesNewRoman,Italic", "Times-Italic" },
{ "TimesNewRoman-Bold", "Times-Bold" },
{ "TimesNewRoman-BoldItalic", "Times-BoldItalic" },
{ "TimesNewRoman-Italic", "Times-Italic" },
{ "TimesNewRomanPS", "Times-Roman" },
{ "TimesNewRomanPS-Bold", "Times-Bold" },
{ "TimesNewRomanPS-BoldItalic", "Times-BoldItalic" },
{ "TimesNewRomanPS-BoldItalicMT", "Times-BoldItalic" },
{ "TimesNewRomanPS-BoldMT", "Times-Bold" },
{ "TimesNewRomanPS-Italic", "Times-Italic" },
{ "TimesNewRomanPS-ItalicMT", "Times-Italic" },
{ "TimesNewRomanPSMT", "Times-Roman" },
{ "TimesNewRomanPSMT,Bold", "Times-Bold" },
{ "TimesNewRomanPSMT,BoldItalic", "Times-BoldItalic" },
{ "TimesNewRomanPSMT,Italic", "Times-Italic" }
};
//------------------------------------------------------------------------
// GfxFont
//------------------------------------------------------------------------
GfxFont *GfxFont::makeFont(XRef *xref, const char *tagA, Ref idA, Dict *fontDict) {
GString *nameA;
GfxFont *font;
Object obj1;
// get base font name
nameA = NULL;
fontDict->lookup("BaseFont", &obj1);
if (obj1.isName()) {
nameA = new GString(obj1.getName());
}
obj1.free();
// get font type
font = NULL;
fontDict->lookup("Subtype", &obj1);
if (obj1.isName("Type1") || obj1.isName("MMType1")) {
font = new Gfx8BitFont(xref, tagA, idA, nameA, fontType1, fontDict);
} else if (obj1.isName("Type1C")) {
font = new Gfx8BitFont(xref, tagA, idA, nameA, fontType1C, fontDict);
} else if (obj1.isName("Type3")) {
font = new Gfx8BitFont(xref, tagA, idA, nameA, fontType3, fontDict);
} else if (obj1.isName("TrueType")) {
font = new Gfx8BitFont(xref, tagA, idA, nameA, fontTrueType, fontDict);
} else if (obj1.isName("Type0")) {
font = new GfxCIDFont(xref, tagA, idA, nameA, fontDict);
} else {
error(-1, "Unknown font type: '%s'",
obj1.isName() ? obj1.getName() : "???");
font = new Gfx8BitFont(xref, tagA, idA, nameA, fontUnknownType, fontDict);
}
obj1.free();
return font;
}
GfxFont::GfxFont(const char *tagA, Ref idA, GString *nameA) {
ok = gFalse;
tag = new GString(tagA);
id = idA;
name = nameA;
origName = nameA;
embFontName = NULL;
extFontFile = NULL;
}
GfxFont::~GfxFont() {
delete tag;
if (origName && origName != name) {
delete origName;
}
if (name) {
delete name;
}
if (embFontName) {
delete embFontName;
}
if (extFontFile) {
delete extFontFile;
}
}
void GfxFont::readFontDescriptor(XRef *xref, Dict *fontDict) {
Object obj1, obj2, obj3, obj4;
double t;
int i;
// assume Times-Roman by default (for substitution purposes)
flags = fontSerif;
embFontID.num = -1;
embFontID.gen = -1;
missingWidth = 0;
if (fontDict->lookup("FontDescriptor", &obj1)->isDict()) {
// get flags
if (obj1.dictLookup("Flags", &obj2)->isInt()) {
flags = obj2.getInt();
}
obj2.free();
// get name
obj1.dictLookup("FontName", &obj2);
if (obj2.isName()) {
embFontName = new GString(obj2.getName());
}
obj2.free();
// look for embedded font file
if (obj1.dictLookupNF("FontFile", &obj2)->isRef()) {
if (type == fontType1) {
embFontID = obj2.getRef();
} else {
error(-1, "Mismatch between font type and embedded font file");
}
}
obj2.free();
if (embFontID.num == -1 &&
obj1.dictLookupNF("FontFile2", &obj2)->isRef()) {
if (type == fontTrueType || type == fontCIDType2) {
embFontID = obj2.getRef();
} else {
error(-1, "Mismatch between font type and embedded font file");
}
}
obj2.free();
if (embFontID.num == -1 &&
obj1.dictLookupNF("FontFile3", &obj2)->isRef()) {
if (obj2.fetch(xref, &obj3)->isStream()) {
obj3.streamGetDict()->lookup("Subtype", &obj4);
if (obj4.isName("Type1")) {
if (type == fontType1) {
embFontID = obj2.getRef();
} else {
error(-1, "Mismatch between font type and embedded font file");
}
} else if (obj4.isName("Type1C")) {
if (type == fontType1) {
type = fontType1C;
embFontID = obj2.getRef();
} else if (type == fontType1C) {
embFontID = obj2.getRef();
} else {
error(-1, "Mismatch between font type and embedded font file");
}
} else if (obj4.isName("TrueType")) {
if (type == fontTrueType) {
embFontID = obj2.getRef();
} else {
error(-1, "Mismatch between font type and embedded font file");
}
} else if (obj4.isName("CIDFontType0C")) {
if (type == fontCIDType0) {
type = fontCIDType0C;
embFontID = obj2.getRef();
} else {
error(-1, "Mismatch between font type and embedded font file");
}
} else {
error(-1, "Unknown embedded font type '%s'",
obj4.isName() ? obj4.getName() : "???");
}
obj4.free();
}
obj3.free();
}
obj2.free();
// look for MissingWidth
obj1.dictLookup("MissingWidth", &obj2);
if (obj2.isNum()) {
missingWidth = obj2.getNum();
}
obj2.free();
// get Ascent and Descent
obj1.dictLookup("Ascent", &obj2);
if (obj2.isNum()) {
t = 0.001 * obj2.getNum();
// some broken font descriptors set ascent and descent to 0
if (t != 0) {
ascent = t;
}
}
obj2.free();
obj1.dictLookup("Descent", &obj2);
if (obj2.isNum()) {
t = 0.001 * obj2.getNum();
// some broken font descriptors set ascent and descent to 0
if (t != 0) {
descent = t;
}
// some broken font descriptors specify a positive descent
if (descent > 0) {
descent = -descent;
}
}
obj2.free();
// font FontBBox
if (obj1.dictLookup("FontBBox", &obj2)->isArray()) {
for (i = 0; i < 4 && i < obj2.arrayGetLength(); ++i) {
if (obj2.arrayGet(i, &obj3)->isNum()) {
fontBBox[i] = 0.001 * obj3.getNum();
}
obj3.free();
}
}
obj2.free();
}
obj1.free();
}
CharCodeToUnicode *GfxFont::readToUnicodeCMap(Dict *fontDict, int nBits,
CharCodeToUnicode *ctu) {
GString *buf;
Object obj1;
int c;
if (!fontDict->lookup("ToUnicode", &obj1)->isStream()) {
obj1.free();
return NULL;
}
buf = new GString();
obj1.streamReset();
while ((c = obj1.streamGetChar()) != EOF) {
buf->append(c);
}
obj1.streamClose();
obj1.free();
if (ctu) {
ctu->mergeCMap(buf, nBits);
} else {
ctu = CharCodeToUnicode::parseCMap(buf, nBits);
}
delete buf;
return ctu;
}
void GfxFont::findExtFontFile() {
static const char *type1Exts[] = { ".pfa", ".pfb", ".ps", "", NULL };
static const char *ttExts[] = { ".ttf", NULL };
if (name) {
if (type == fontType1) {
extFontFile = globalParams->findFontFile(name, type1Exts);
} else if (type == fontTrueType) {
extFontFile = globalParams->findFontFile(name, ttExts);
}
}
}
char *GfxFont::readExtFontFile(int *len) {
FILE *f;
char *buf;
if (!(f = fopen(extFontFile->getCString(), "rb"))) {
error(-1, "External font file '%s' vanished", extFontFile->getCString());
return NULL;
}
fseek(f, 0, SEEK_END);
*len = (int)ftell(f);
fseek(f, 0, SEEK_SET);
buf = (char *)gmalloc(*len);
if ((int)fread(buf, 1, *len, f) != *len) {
error(-1, "Error reading external font file '%s'",
extFontFile->getCString());
}
fclose(f);
return buf;
}
char *GfxFont::readEmbFontFile(XRef *xref, int *len) {
char *buf;
Object obj1, obj2;
Stream *str;
int c;
int size, i;
obj1.initRef(embFontID.num, embFontID.gen);
obj1.fetch(xref, &obj2);
if (!obj2.isStream()) {
error(-1, "Embedded font file is not a stream");
obj2.free();
obj1.free();
embFontID.num = -1;
return NULL;
}
str = obj2.getStream();
buf = NULL;
i = size = 0;
str->reset();
while ((c = str->getChar()) != EOF) {
if (i == size) {
size += 4096;
buf = (char *)grealloc(buf, size);
}
buf[i++] = c;
}
*len = i;
str->close();
obj2.free();
obj1.free();
return buf;
}
//------------------------------------------------------------------------
// Gfx8BitFont
//------------------------------------------------------------------------
Gfx8BitFont::Gfx8BitFont(XRef *xref, const char *tagA, Ref idA, GString *nameA,
GfxFontType typeA, Dict *fontDict):
GfxFont(tagA, idA, nameA)
{
BuiltinFont *builtinFont;
const char **baseEnc;
GBool baseEncFromFontFile;
char *buf;
int len;
FoFiType1 *ffT1;
FoFiType1C *ffT1C;
int code, code2;
const char *charName;
GBool missing, hex;
Unicode toUnicode[256];
CharCodeToUnicode *utu, *ctu2;
Unicode uBuf[8];
double mul;
int firstChar, lastChar;
Gushort w;
Object obj1, obj2, obj3;
int n, i, a, b, m;
type = typeA;
ctu = NULL;
// do font name substitution for various aliases of the Base 14 font
// names
if (name) {
a = 0;
b = sizeof(stdFontMap) / sizeof(StdFontMapEntry);
// invariant: stdFontMap[a].altName <= name < stdFontMap[b].altName
while (b - a > 1) {
m = (a + b) / 2;
if (name->cmp(stdFontMap[m].altName) >= 0) {
a = m;
} else {
b = m;
}
}
if (!name->cmp(stdFontMap[a].altName)) {
name = new GString(stdFontMap[a].properName);
}
}
// is it a built-in font?
builtinFont = NULL;
if (name) {
for (i = 0; i < nBuiltinFonts; ++i) {
if (!name->cmp(builtinFonts[i].name)) {
builtinFont = &builtinFonts[i];
break;
}
}
}
// default ascent/descent values
if (builtinFont) {
ascent = 0.001 * builtinFont->ascent;
descent = 0.001 * builtinFont->descent;
fontBBox[0] = 0.001 * builtinFont->bbox[0];
fontBBox[1] = 0.001 * builtinFont->bbox[1];
fontBBox[2] = 0.001 * builtinFont->bbox[2];
fontBBox[3] = 0.001 * builtinFont->bbox[3];
} else {
ascent = 0.95;
descent = -0.35;
fontBBox[0] = fontBBox[1] = fontBBox[2] = fontBBox[3] = 0;
}
// get info from font descriptor
readFontDescriptor(xref, fontDict);
// look for an external font file
findExtFontFile();
// get font matrix
fontMat[0] = fontMat[3] = 1;
fontMat[1] = fontMat[2] = fontMat[4] = fontMat[5] = 0;
if (fontDict->lookup("FontMatrix", &obj1)->isArray()) {
for (i = 0; i < 6 && i < obj1.arrayGetLength(); ++i) {
if (obj1.arrayGet(i, &obj2)->isNum()) {
fontMat[i] = obj2.getNum();
}
obj2.free();
}
}
obj1.free();
// get Type 3 bounding box, font definition, and resources
if (type == fontType3) {
if (fontDict->lookup("FontBBox", &obj1)->isArray()) {
for (i = 0; i < 4 && i < obj1.arrayGetLength(); ++i) {
if (obj1.arrayGet(i, &obj2)->isNum()) {
fontBBox[i] = obj2.getNum();
}
obj2.free();
}
}
obj1.free();
if (!fontDict->lookup("CharProcs", &charProcs)->isDict()) {
error(-1, "Missing or invalid CharProcs dictionary in Type 3 font");
charProcs.free();
}
if (!fontDict->lookup("Resources", &resources)->isDict()) {
resources.free();
}
}
//----- build the font encoding -----
// Encodings start with a base encoding, which can come from
// (in order of priority):
// 1. FontDict.Encoding or FontDict.Encoding.BaseEncoding
// - MacRoman / MacExpert / WinAnsi / Standard
// 2. embedded or external font file
// 3. default:
// - builtin --> builtin encoding
// - TrueType --> MacRomanEncoding
// - others --> StandardEncoding
// and then add a list of differences (if any) from
// FontDict.Encoding.Differences.
// check FontDict for base encoding
hasEncoding = gFalse;
usesMacRomanEnc = gFalse;
baseEnc = NULL;
baseEncFromFontFile = gFalse;
fontDict->lookup("Encoding", &obj1);
if (obj1.isDict()) {
obj1.dictLookup("BaseEncoding", &obj2);
if (obj2.isName("MacRomanEncoding")) {
hasEncoding = gTrue;
usesMacRomanEnc = gTrue;
baseEnc = macRomanEncoding;
} else if (obj2.isName("MacExpertEncoding")) {
hasEncoding = gTrue;
baseEnc = macExpertEncoding;
} else if (obj2.isName("WinAnsiEncoding")) {
hasEncoding = gTrue;
baseEnc = winAnsiEncoding;
} else if (obj2.isName("StandardEncoding")) {
hasEncoding = gTrue;
baseEnc = standardEncoding;
}
obj2.free();
} else if (obj1.isName("MacRomanEncoding")) {
hasEncoding = gTrue;
usesMacRomanEnc = gTrue;
baseEnc = macRomanEncoding;
} else if (obj1.isName("MacExpertEncoding")) {
hasEncoding = gTrue;
baseEnc = macExpertEncoding;
} else if (obj1.isName("WinAnsiEncoding")) {
hasEncoding = gTrue;
baseEnc = winAnsiEncoding;
} else if (obj1.isName("StandardEncoding")) {
hasEncoding = gTrue;
baseEnc = standardEncoding;
}
// check embedded or external font file for base encoding
// (only for Type 1 fonts - trying to get an encoding out of a
// TrueType font is a losing proposition)
ffT1 = NULL;
ffT1C = NULL;
buf = NULL;
if (type == fontType1 && (extFontFile || embFontID.num >= 0)) {
if (extFontFile) {
ffT1 = FoFiType1::load(extFontFile->getCString());
} else {
buf = readEmbFontFile(xref, &len);
ffT1 = FoFiType1::make(buf, len);
}
if (ffT1) {
if (ffT1->getName()) {
if (embFontName) {
delete embFontName;
}
embFontName = new GString(ffT1->getName());
}
if (!baseEnc) {
baseEnc = ffT1->getEncoding();
baseEncFromFontFile = gTrue;
}
}
} else if (type == fontType1C && (extFontFile || embFontID.num >= 0)) {
if (extFontFile) {
ffT1C = FoFiType1C::load(extFontFile->getCString());
} else {
buf = readEmbFontFile(xref, &len);
ffT1C = FoFiType1C::make(buf, len);
}
if (ffT1C) {
if (ffT1C->getName()) {
if (embFontName) {
delete embFontName;
}
embFontName = new GString(ffT1C->getName());
}
if (!baseEnc) {
baseEnc = ffT1C->getEncoding();
baseEncFromFontFile = gTrue;
}
}
}
if (buf) {
gfree(buf);
}
// get default base encoding
if (!baseEnc) {
if (builtinFont) {
baseEnc = builtinFont->defaultBaseEnc;
hasEncoding = gTrue;
} else if (type == fontTrueType) {
baseEnc = winAnsiEncoding;
} else {
baseEnc = standardEncoding;
}
}
// copy the base encoding
for (i = 0; i < 256; ++i) {
enc[i] = baseEnc[i];
if ((encFree[i] = baseEncFromFontFile) && enc[i]) {
enc[i] = copyString(baseEnc[i]);
}
}
// some Type 1C font files have empty encodings, which can break the
// T1C->T1 conversion (since the 'seac' operator depends on having
// the accents in the encoding), so we fill in any gaps from
// StandardEncoding
if (type == fontType1C && (extFontFile || embFontID.num >= 0) &&
baseEncFromFontFile) {
for (i = 0; i < 256; ++i) {
if (!enc[i] && standardEncoding[i]) {
enc[i] = standardEncoding[i];
encFree[i] = gFalse;
}
}
}
// merge differences into encoding
if (obj1.isDict()) {
obj1.dictLookup("Differences", &obj2);
if (obj2.isArray()) {
hasEncoding = gTrue;
code = 0;
for (i = 0; i < obj2.arrayGetLength(); ++i) {
obj2.arrayGet(i, &obj3);
if (obj3.isInt()) {
code = obj3.getInt();
} else if (obj3.isName()) {
if (code >= 0 && code < 256) {
if (encFree[code]) {
gfree((void*)enc[code]);
}
enc[code] = copyString(obj3.getName());
encFree[code] = gTrue;
}
++code;
} else {
error(-1, "Wrong type in font encoding resource differences (%s)",
obj3.getTypeName());
}
obj3.free();
}
}
obj2.free();
}
obj1.free();
if (ffT1) {
delete ffT1;
}
if (ffT1C) {
delete ffT1C;
}
//----- build the mapping to Unicode -----
// pass 1: use the name-to-Unicode mapping table
missing = hex = gFalse;
for (code = 0; code < 256; ++code) {
if ((charName = enc[code])) {
if (!(toUnicode[code] = globalParams->mapNameToUnicode(charName)) &&
strcmp(charName, ".notdef")) {
// if it wasn't in the name-to-Unicode table, check for a
// name that looks like 'Axx' or 'xx', where 'A' is any letter
// and 'xx' is two hex digits
if ((strlen(charName) == 3 &&
isalpha(charName[0]) &&
isxdigit(charName[1]) && isxdigit(charName[2]) &&
((charName[1] >= 'a' && charName[1] <= 'f') ||
(charName[1] >= 'A' && charName[1] <= 'F') ||
(charName[2] >= 'a' && charName[2] <= 'f') ||
(charName[2] >= 'A' && charName[2] <= 'F'))) ||
(strlen(charName) == 2 &&
isxdigit(charName[0]) && isxdigit(charName[1]) &&
((charName[0] >= 'a' && charName[0] <= 'f') ||
(charName[0] >= 'A' && charName[0] <= 'F') ||
(charName[1] >= 'a' && charName[1] <= 'f') ||
(charName[1] >= 'A' && charName[1] <= 'F')))) {
hex = gTrue;
}
missing = gTrue;
}
} else {
toUnicode[code] = 0;
}
}
// pass 2: try to fill in the missing chars, looking for names of
// the form 'Axx', 'xx', 'Ann', 'ABnn', or 'nn', where 'A' and 'B'
// are any letters, 'xx' is two hex digits, and 'nn' is 2-4
// decimal digits
if (missing && globalParams->getMapNumericCharNames()) {
for (code = 0; code < 256; ++code) {
if ((charName = enc[code]) && !toUnicode[code] &&
strcmp(charName, ".notdef")) {
n = strlen(charName);
code2 = -1;
if (hex && n == 3 && isalpha(charName[0]) &&
isxdigit(charName[1]) && isxdigit(charName[2])) {
sscanf(charName+1, "%x", &code2);
} else if (hex && n == 2 &&
isxdigit(charName[0]) && isxdigit(charName[1])) {
sscanf(charName, "%x", &code2);
} else if (!hex && n >= 2 && n <= 4 &&
isdigit(charName[0]) && isdigit(charName[1])) {
code2 = atoi(charName);
} else if (n >= 3 && n <= 5 &&
isdigit(charName[1]) && isdigit(charName[2])) {
code2 = atoi(charName+1);
} else if (n >= 4 && n <= 6 &&
isdigit(charName[2]) && isdigit(charName[3])) {
code2 = atoi(charName+2);
}
if (code2 >= 0 && code2 <= 0xff) {
toUnicode[code] = (Unicode)code2;
}
}
}
}
// construct the char code -> Unicode mapping object
ctu = CharCodeToUnicode::make8BitToUnicode(toUnicode);
// merge in a ToUnicode CMap, if there is one -- this overwrites
// existing entries in ctu, i.e., the ToUnicode CMap takes
// precedence, but the other encoding info is allowed to fill in any
// holes
readToUnicodeCMap(fontDict, 8, ctu);
// look for a Unicode-to-Unicode mapping
if (name && (utu = globalParams->getUnicodeToUnicode(name))) {
for (i = 0; i < 256; ++i) {
toUnicode[i] = 0;
}
ctu2 = CharCodeToUnicode::make8BitToUnicode(toUnicode);
for (i = 0; i < 256; ++i) {
n = ctu->mapToUnicode((CharCode)i, uBuf, 8);
if (n >= 1) {
n = utu->mapToUnicode((CharCode)uBuf[0], uBuf, 8);
if (n >= 1) {
ctu2->setMapping((CharCode)i, uBuf, n);
}
}
}
utu->decRefCnt();
delete ctu;
ctu = ctu2;
}
//----- get the character widths -----
// initialize all widths
for (code = 0; code < 256; ++code) {
widths[code] = missingWidth * 0.001;
}
// use widths from font dict, if present
fontDict->lookup("FirstChar", &obj1);
firstChar = obj1.isInt() ? obj1.getInt() : 0;
obj1.free();
if (firstChar < 0 || firstChar > 255) {
firstChar = 0;
}
fontDict->lookup("LastChar", &obj1);
lastChar = obj1.isInt() ? obj1.getInt() : 255;
obj1.free();
if (lastChar < 0 || lastChar > 255) {
lastChar = 255;
}
mul = (type == fontType3) ? fontMat[0] : 0.001;
fontDict->lookup("Widths", &obj1);
if (obj1.isArray()) {
flags |= fontFixedWidth;
if (obj1.arrayGetLength() < lastChar - firstChar + 1) {
lastChar = firstChar + obj1.arrayGetLength() - 1;
}
for (code = firstChar; code <= lastChar; ++code) {
obj1.arrayGet(code - firstChar, &obj2);
if (obj2.isNum()) {
widths[code] = obj2.getNum() * mul;
if (widths[code] != widths[firstChar]) {
flags &= ~fontFixedWidth;
}
}
obj2.free();
}
// use widths from built-in font
} else if (builtinFont) {
// this is a kludge for broken PDF files that encode char 32
// as .notdef
if (builtinFont->widths->getWidth("space", &w)) {
widths[32] = 0.001 * w;
}
for (code = 0; code < 256; ++code) {
if (enc[code] && builtinFont->widths->getWidth(enc[code], &w)) {
widths[code] = 0.001 * w;
}
}
// couldn't find widths -- use defaults
} else {
// this is technically an error -- the Widths entry is required
// for all but the Base-14 fonts -- but certain PDF generators
// apparently don't include widths for Arial and TimesNewRoman
if (isFixedWidth()) {
i = 0;
} else if (isSerif()) {
i = 8;
} else {
i = 4;
}
if (isBold()) {
i += 2;
}
if (isItalic()) {
i += 1;
}
builtinFont = builtinFontSubst[i];
// this is a kludge for broken PDF files that encode char 32
// as .notdef
if (builtinFont->widths->getWidth("space", &w)) {
widths[32] = 0.001 * w;
}
for (code = 0; code < 256; ++code) {
if (enc[code] && builtinFont->widths->getWidth(enc[code], &w)) {
widths[code] = 0.001 * w;
}
}
}
obj1.free();
ok = gTrue;
}
Gfx8BitFont::~Gfx8BitFont() {
int i;
for (i = 0; i < 256; ++i) {
if (encFree[i] && enc[i]) {
gfree((void*)enc[i]);
}
}
ctu->decRefCnt();
if (charProcs.isDict()) {
charProcs.free();
}
if (resources.isDict()) {
resources.free();
}
}
int Gfx8BitFont::getNextChar(char *s, int /*len*/, CharCode *code,
Unicode *u, int uSize, int *uLen,
double *dx, double *dy, double *ox, double *oy) {
CharCode c;
*code = c = (CharCode)(*s & 0xff);
*uLen = ctu->mapToUnicode(c, u, uSize);
*dx = widths[c];
*dy = *ox = *oy = 0;
return 1;
}
CharCodeToUnicode *Gfx8BitFont::getToUnicode() {
ctu->incRefCnt();
return ctu;
}
Gushort *Gfx8BitFont::getCodeToGIDMap(FoFiTrueType *ff) {
Gushort *map;
int cmapPlatform, cmapEncoding;
int unicodeCmap, macRomanCmap, msSymbolCmap, cmap;
GBool useMacRoman, useUnicode;
const char *charName;
Unicode u;
int code, i, n;
map = (Gushort *)gmalloc(256 * sizeof(Gushort));
for (i = 0; i < 256; ++i) {
map[i] = 0;
}
// To match up with the Adobe-defined behaviour, we choose a cmap
// like this:
// 1. If the PDF font has an encoding:
// 1a. If the PDF font specified MacRomanEncoding and the
// TrueType font has a Macintosh Roman cmap, use it, and
// reverse map the char names through MacRomanEncoding to
// get char codes.
// 1b. If the TrueType font has a Microsoft Unicode cmap or a
// non-Microsoft Unicode cmap, use it, and use the Unicode
// indexes, not the char codes.
// 1c. If the PDF font is symbolic and the TrueType font has a
// Microsoft Symbol cmap, use it, and use char codes
// directly (possibly with an offset of 0xf000).
// 1d. If the TrueType font has a Macintosh Roman cmap, use it,
// as in case 1a.
// 2. If the PDF font does not have an encoding:
// 2a. If the TrueType font has a Macintosh Roman cmap, use it,
// and use char codes directly (possibly with an offset of
// 0xf000).
// 2b. If the TrueType font has a Microsoft Symbol cmap, use it,
// and use char codes directly (possible with an offset of
// 0xf000).
// 3. If none of these rules apply, use the first cmap and hope for
// the best (this shouldn't happen).
unicodeCmap = macRomanCmap = msSymbolCmap = -1;
for (i = 0; i < ff->getNumCmaps(); ++i) {
cmapPlatform = ff->getCmapPlatform(i);
cmapEncoding = ff->getCmapEncoding(i);
if ((cmapPlatform == 3 && cmapEncoding == 1) ||
cmapPlatform == 0) {
unicodeCmap = i;
} else if (cmapPlatform == 1 && cmapEncoding == 0) {
macRomanCmap = i;
} else if (cmapPlatform == 3 && cmapEncoding == 0) {
msSymbolCmap = i;
}
}
cmap = 0;
useMacRoman = gFalse;
useUnicode = gFalse;
if (hasEncoding) {
if (usesMacRomanEnc && macRomanCmap >= 0) {
cmap = macRomanCmap;
useMacRoman = gTrue;
} else if (unicodeCmap >= 0) {
cmap = unicodeCmap;
useUnicode = gTrue;
} else if ((flags & fontSymbolic) && msSymbolCmap >= 0) {
cmap = msSymbolCmap;
} else if (macRomanCmap >= 0) {
cmap = macRomanCmap;
useMacRoman = gTrue;
}
} else {
if (macRomanCmap >= 0) {
cmap = macRomanCmap;
} else if (msSymbolCmap >= 0) {
cmap = msSymbolCmap;
}
}
// reverse map the char names through MacRomanEncoding, then map the
// char codes through the cmap
if (useMacRoman) {
for (i = 0; i < 256; ++i) {
if ((charName = enc[i])) {
if ((code = globalParams->getMacRomanCharCode(charName))) {
map[i] = ff->mapCodeToGID(cmap, code);
}
}
}
// map Unicode through the cmap
} else if (useUnicode) {
for (i = 0; i < 256; ++i) {
if ((n = ctu->mapToUnicode((CharCode)i, &u, 1))) {
map[i] = ff->mapCodeToGID(cmap, u);
}
}
// map the char codes through the cmap, possibly with an offset of
// 0xf000
} else {
for (i = 0; i < 256; ++i) {
if (!(map[i] = ff->mapCodeToGID(cmap, i))) {
map[i] = ff->mapCodeToGID(cmap, 0xf000 + i);
}
}
}
// try the TrueType 'post' table to handle any unmapped characters
for (i = 0; i < 256; ++i) {
if (!map[i] && (charName = enc[i])) {
map[i] = (Gushort)(int)ff->mapNameToGID(charName);
}
}
return map;
}
Dict *Gfx8BitFont::getCharProcs() {
return charProcs.isDict() ? charProcs.getDict() : (Dict *)NULL;
}
Object *Gfx8BitFont::getCharProc(int code, Object *proc) {
if (enc[code] && charProcs.isDict()) {
charProcs.dictLookup(enc[code], proc);
} else {
proc->initNull();
}
return proc;
}
Dict *Gfx8BitFont::getResources() {
return resources.isDict() ? resources.getDict() : (Dict *)NULL;
}
//------------------------------------------------------------------------
// GfxCIDFont
//------------------------------------------------------------------------
static int CDECL cmpWidthExcep(const void *w1, const void *w2) {
return ((GfxFontCIDWidthExcep *)w1)->first -
((GfxFontCIDWidthExcep *)w2)->first;
}
static int CDECL cmpWidthExcepV(const void *w1, const void *w2) {
return ((GfxFontCIDWidthExcepV *)w1)->first -
((GfxFontCIDWidthExcepV *)w2)->first;
}
GfxCIDFont::GfxCIDFont(XRef *xref, const char *tagA, Ref idA, GString *nameA,
Dict *fontDict):
GfxFont(tagA, idA, nameA)
{
Dict *desFontDict;
GString *collection, *cMapName;
Object desFontDictObj;
Object obj1, obj2, obj3, obj4, obj5, obj6;
int c1, c2;
int excepsSize, i, j, k;
ascent = 0.95;
descent = -0.35;
fontBBox[0] = fontBBox[1] = fontBBox[2] = fontBBox[3] = 0;
cMap = NULL;
ctu = NULL;
widths.defWidth = 1.0;
widths.defHeight = -1.0;
widths.defVY = 0.880;
widths.exceps = NULL;
widths.nExceps = 0;
widths.excepsV = NULL;
widths.nExcepsV = 0;
cidToGID = NULL;
cidToGIDLen = 0;
// get the descendant font
if (!fontDict->lookup("DescendantFonts", &obj1)->isArray()) {
error(-1, "Missing DescendantFonts entry in Type 0 font");
obj1.free();
goto err1;
}
if (!obj1.arrayGet(0, &desFontDictObj)->isDict()) {
error(-1, "Bad descendant font in Type 0 font");
goto err3;
}
obj1.free();
desFontDict = desFontDictObj.getDict();
// font type
if (!desFontDict->lookup("Subtype", &obj1)) {
error(-1, "Missing Subtype entry in Type 0 descendant font");
goto err3;
}
if (obj1.isName("CIDFontType0")) {
type = fontCIDType0;
} else if (obj1.isName("CIDFontType2")) {
type = fontCIDType2;
} else {
error(-1, "Unknown Type 0 descendant font type '%s'",
obj1.isName() ? obj1.getName() : "???");
goto err3;
}
obj1.free();
// get info from font descriptor
readFontDescriptor(xref, desFontDict);
// look for an external font file
findExtFontFile();
//----- encoding info -----
// char collection
if (!desFontDict->lookup("CIDSystemInfo", &obj1)->isDict()) {
error(-1, "Missing CIDSystemInfo dictionary in Type 0 descendant font");
goto err3;
}
obj1.dictLookup("Registry", &obj2);
obj1.dictLookup("Ordering", &obj3);
if (!obj2.isString() || !obj3.isString()) {
error(-1, "Invalid CIDSystemInfo dictionary in Type 0 descendant font");
goto err4;
}
collection = obj2.getString()->copy()->append('-')->append(obj3.getString());
obj3.free();
obj2.free();
obj1.free();
// look for a ToUnicode CMap
if (!(ctu = readToUnicodeCMap(fontDict, 16, NULL))) {
// the "Adobe-Identity" and "Adobe-UCS" collections don't have
// cidToUnicode files
if (collection->cmp("Adobe-Identity") &&
collection->cmp("Adobe-UCS")) {
// look for a user-supplied .cidToUnicode file
if (!(ctu = globalParams->getCIDToUnicode(collection))) {
error(-1, "Unknown character collection '%s'",
collection->getCString());
delete collection;
goto err2;
}
}
}
// encoding (i.e., CMap)
//~ need to handle a CMap stream here
//~ also need to deal with the UseCMap entry in the stream dict
if (!fontDict->lookup("Encoding", &obj1)->isName()) {
error(-1, "Missing or invalid Encoding entry in Type 0 font");
delete collection;
goto err3;
}
cMapName = new GString(obj1.getName());
obj1.free();
if (!(cMap = globalParams->getCMap(collection, cMapName))) {
error(-1, "Unknown CMap '%s' for character collection '%s'",
cMapName->getCString(), collection->getCString());
delete collection;
delete cMapName;
goto err2;
}
delete collection;
delete cMapName;
// CIDToGIDMap (for embedded TrueType fonts)
if (type == fontCIDType2) {
desFontDict->lookup("CIDToGIDMap", &obj1);
if (obj1.isStream()) {
cidToGIDLen = 0;
i = 64;
cidToGID = (Gushort *)gmalloc(i * sizeof(Gushort));
obj1.streamReset();
while ((c1 = obj1.streamGetChar()) != EOF &&
(c2 = obj1.streamGetChar()) != EOF) {
if (cidToGIDLen == i) {
i *= 2;
cidToGID = (Gushort *)grealloc(cidToGID, i * sizeof(Gushort));
}
cidToGID[cidToGIDLen++] = (Gushort)((c1 << 8) + c2);
}
} else if (!obj1.isName("Identity") && !obj1.isNull()) {
error(-1, "Invalid CIDToGIDMap entry in CID font");
}
obj1.free();
}
//----- character metrics -----
// default char width
if (desFontDict->lookup("DW", &obj1)->isInt()) {
widths.defWidth = obj1.getInt() * 0.001;
}
obj1.free();
// char width exceptions
if (desFontDict->lookup("W", &obj1)->isArray()) {
excepsSize = 0;
i = 0;
while (i + 1 < obj1.arrayGetLength()) {
obj1.arrayGet(i, &obj2);
obj1.arrayGet(i + 1, &obj3);
if (obj2.isInt() && obj3.isInt() && i + 2 < obj1.arrayGetLength()) {
if (obj1.arrayGet(i + 2, &obj4)->isNum()) {
if (widths.nExceps == excepsSize) {
excepsSize += 16;
widths.exceps = (GfxFontCIDWidthExcep *)
grealloc(widths.exceps,
excepsSize * sizeof(GfxFontCIDWidthExcep));
}
widths.exceps[widths.nExceps].first = obj2.getInt();
widths.exceps[widths.nExceps].last = obj3.getInt();
widths.exceps[widths.nExceps].width = obj4.getNum() * 0.001;
++widths.nExceps;
} else {
error(-1, "Bad widths array in Type 0 font");
}
obj4.free();
i += 3;
} else if (obj2.isInt() && obj3.isArray()) {
if (widths.nExceps + obj3.arrayGetLength() > excepsSize) {
excepsSize = (widths.nExceps + obj3.arrayGetLength() + 15) & ~15;
widths.exceps = (GfxFontCIDWidthExcep *)
grealloc(widths.exceps,
excepsSize * sizeof(GfxFontCIDWidthExcep));
}
j = obj2.getInt();
for (k = 0; k < obj3.arrayGetLength(); ++k) {
if (obj3.arrayGet(k, &obj4)->isNum()) {
widths.exceps[widths.nExceps].first = j;
widths.exceps[widths.nExceps].last = j;
widths.exceps[widths.nExceps].width = obj4.getNum() * 0.001;
++j;
++widths.nExceps;
} else {
error(-1, "Bad widths array in Type 0 font");
}
obj4.free();
}
i += 2;
} else {
error(-1, "Bad widths array in Type 0 font");
++i;
}
obj3.free();
obj2.free();
}
qsort(widths.exceps, widths.nExceps, sizeof(GfxFontCIDWidthExcep),
&cmpWidthExcep);
}
obj1.free();
// default metrics for vertical font
if (desFontDict->lookup("DW2", &obj1)->isArray() &&
obj1.arrayGetLength() == 2) {
if (obj1.arrayGet(0, &obj2)->isNum()) {
widths.defVY = obj2.getNum() * 0.001;
}
obj2.free();
if (obj1.arrayGet(1, &obj2)->isNum()) {
widths.defHeight = obj2.getNum() * 0.001;
}
obj2.free();
}
obj1.free();
// char metric exceptions for vertical font
if (desFontDict->lookup("W2", &obj1)->isArray()) {
excepsSize = 0;
i = 0;
while (i + 1 < obj1.arrayGetLength()) {
obj1.arrayGet(i, &obj2);
obj1.arrayGet(i+ 1, &obj3);
if (obj2.isInt() && obj3.isInt() && i + 4 < obj1.arrayGetLength()) {
if (obj1.arrayGet(i + 2, &obj4)->isNum() &&
obj1.arrayGet(i + 3, &obj5)->isNum() &&
obj1.arrayGet(i + 4, &obj6)->isNum()) {
if (widths.nExcepsV == excepsSize) {
excepsSize += 16;
widths.excepsV = (GfxFontCIDWidthExcepV *)
grealloc(widths.excepsV,
excepsSize * sizeof(GfxFontCIDWidthExcepV));
}
widths.excepsV[widths.nExcepsV].first = obj2.getInt();
widths.excepsV[widths.nExcepsV].last = obj3.getInt();
widths.excepsV[widths.nExcepsV].height = obj4.getNum() * 0.001;
widths.excepsV[widths.nExcepsV].vx = obj5.getNum() * 0.001;
widths.excepsV[widths.nExcepsV].vy = obj6.getNum() * 0.001;
++widths.nExcepsV;
} else {
error(-1, "Bad widths (W2) array in Type 0 font");
}
obj6.free();
obj5.free();
obj4.free();
i += 5;
} else if (obj2.isInt() && obj3.isArray()) {
if (widths.nExcepsV + obj3.arrayGetLength() / 3 > excepsSize) {
excepsSize =
(widths.nExcepsV + obj3.arrayGetLength() / 3 + 15) & ~15;
widths.excepsV = (GfxFontCIDWidthExcepV *)
grealloc(widths.excepsV,
excepsSize * sizeof(GfxFontCIDWidthExcepV));
}
j = obj2.getInt();
for (k = 0; k < obj3.arrayGetLength(); k += 3) {
if (obj3.arrayGet(k, &obj4)->isNum() &&
obj3.arrayGet(k+1, &obj5)->isNum() &&
obj3.arrayGet(k+2, &obj6)->isNum()) {
widths.excepsV[widths.nExceps].first = j;
widths.excepsV[widths.nExceps].last = j;
widths.excepsV[widths.nExceps].height = obj4.getNum() * 0.001;
widths.excepsV[widths.nExceps].vx = obj5.getNum() * 0.001;
widths.excepsV[widths.nExceps].vy = obj6.getNum() * 0.001;
++j;
++widths.nExcepsV;
} else {
error(-1, "Bad widths (W2) array in Type 0 font");
}
obj6.free();
obj5.free();
obj4.free();
}
i += 2;
} else {
error(-1, "Bad widths (W2) array in Type 0 font");
++i;
}
obj3.free();
obj2.free();
}
qsort(widths.excepsV, widths.nExcepsV, sizeof(GfxFontCIDWidthExcepV),
&cmpWidthExcepV);
}
obj1.free();
desFontDictObj.free();
ok = gTrue;
return;
err4:
obj3.free();
obj2.free();
err3:
obj1.free();
err2:
desFontDictObj.free();
err1:;
}
GfxCIDFont::~GfxCIDFont() {
if (cMap) {
cMap->decRefCnt();
}
if (ctu) {
ctu->decRefCnt();
}
gfree(widths.exceps);
gfree(widths.excepsV);
if (cidToGID) {
gfree(cidToGID);
}
}
int GfxCIDFont::getNextChar(char *s, int len, CharCode *code,
Unicode *u, int uSize, int *uLen,
double *dx, double *dy, double *ox, double *oy) {
CID cid;
double w, h, vx, vy;
int n, a, b, m;
if (!cMap) {
*code = 0;
*uLen = 0;
*dx = *dy = 0;
return 1;
}
*code = (CharCode)(cid = cMap->getCID(s, len, &n));
if (ctu) {
*uLen = ctu->mapToUnicode(cid, u, uSize);
} else {
*uLen = 0;
}
// horizontal
if (cMap->getWMode() == 0) {
w = widths.defWidth;
h = vx = vy = 0;
if (widths.nExceps > 0 && cid >= widths.exceps[0].first) {
a = 0;
b = widths.nExceps;
// invariant: widths.exceps[a].first <= cid < widths.exceps[b].first
while (b - a > 1) {
m = (a + b) / 2;
if (widths.exceps[m].first <= cid) {
a = m;
} else {
b = m;
}
}
if (cid <= widths.exceps[a].last) {
w = widths.exceps[a].width;
}
}
// vertical
} else {
w = 0;
h = widths.defHeight;
vx = widths.defWidth / 2;
vy = widths.defVY;
if (widths.nExcepsV > 0 && cid >= widths.excepsV[0].first) {
a = 0;
b = widths.nExcepsV;
// invariant: widths.excepsV[a].first <= cid < widths.excepsV[b].first
while (b - a > 1) {
m = (a + b) / 2;
if (widths.excepsV[m].last <= cid) {
a = m;
} else {
b = m;
}
}
if (cid <= widths.excepsV[a].last) {
h = widths.excepsV[a].height;
vx = widths.excepsV[a].vx;
vy = widths.excepsV[a].vy;
}
}
}
*dx = w;
*dy = h;
*ox = vx;
*oy = vy;
return n;
}
int GfxCIDFont::getWMode() {
return cMap ? cMap->getWMode() : 0;
}
CharCodeToUnicode *GfxCIDFont::getToUnicode() {
if (ctu) {
ctu->incRefCnt();
}
return ctu;
}
GString *GfxCIDFont::getCollection() {
return cMap ? cMap->getCollection() : (GString *)NULL;
}
//------------------------------------------------------------------------
// GfxFontDict
//------------------------------------------------------------------------
GfxFontDict::GfxFontDict(XRef *xref, Ref *fontDictRef, Dict *fontDict) {
int i;
Object obj1, obj2;
Ref r;
numFonts = fontDict->getLength();
fonts = (GfxFont **)gmalloc(numFonts * sizeof(GfxFont *));
for (i = 0; i < numFonts; ++i) {
fontDict->getValNF(i, &obj1);
obj1.fetch(xref, &obj2);
if (obj2.isDict()) {
if (obj1.isRef()) {
r = obj1.getRef();
} else {
// no indirect reference for this font, so invent a unique one
// (legal generation numbers are five digits, so any 6-digit
// number would be safe)
r.num = i;
if (fontDictRef) {
r.gen = 100000 + fontDictRef->num;
} else {
r.gen = 999999;
}
}
fonts[i] = GfxFont::makeFont(xref, fontDict->getKey(i),
r, obj2.getDict());
if (fonts[i] && !fonts[i]->isOk()) {
delete fonts[i];
fonts[i] = NULL;
}
} else {
error(-1, "font resource is not a dictionary");
fonts[i] = NULL;
}
obj1.free();
obj2.free();
}
}
GfxFontDict::~GfxFontDict() {
int i;
for (i = 0; i < numFonts; ++i) {
if (fonts[i]) {
delete fonts[i];
}
}
gfree(fonts);
}
GfxFont *GfxFontDict::lookup(const char *tag) {
int i;
for (i = 0; i < numFonts; ++i) {
if (fonts[i] && fonts[i]->matches(tag)) {
return fonts[i];
}
}
return NULL;
}