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GfxFont.cc
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//========================================================================
//
// GfxFont.cc
//
// Copyright 1996-2003 Glyph & Cog, LLC
//
//========================================================================
//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2005, 2006, 2008-2010, 2012, 2014, 2015, 2017-2024 Albert Astals Cid <[email protected]>
// Copyright (C) 2005, 2006 Kristian Høgsberg <[email protected]>
// Copyright (C) 2006 Takashi Iwai <[email protected]>
// Copyright (C) 2007 Julien Rebetez <[email protected]>
// Copyright (C) 2007 Jeff Muizelaar <[email protected]>
// Copyright (C) 2007 Koji Otani <[email protected]>
// Copyright (C) 2007 Ed Catmur <[email protected]>
// Copyright (C) 2008 Jonathan Kew <[email protected]>
// Copyright (C) 2008 Ed Avis <[email protected]>
// Copyright (C) 2008, 2010 Hib Eris <[email protected]>
// Copyright (C) 2009 Peter Kerzum <[email protected]>
// Copyright (C) 2009, 2010 David Benjamin <[email protected]>
// Copyright (C) 2011 Axel Strübing <[email protected]>
// Copyright (C) 2011, 2012, 2014 Adrian Johnson <[email protected]>
// Copyright (C) 2012 Yi Yang <[email protected]>
// Copyright (C) 2012 Suzuki Toshiya <[email protected]>
// Copyright (C) 2012, 2017 Thomas Freitag <[email protected]>
// Copyright (C) 2013-2016, 2018 Jason Crain <[email protected]>
// Copyright (C) 2014 Olly Betts <[email protected]>
// Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, <[email protected]>. Work sponsored by the LiMux project of the city of Munich
// Copyright (C) 2018 Adam Reichold <[email protected]>
// Copyright (C) 2019 LE GARREC Vincent <[email protected]>
// Copyright (C) 2021, 2022, 2024 Oliver Sander <[email protected]>
// Copyright (C) 2023 Khaled Hosny <[email protected]>
// Copyright (C) 2024 Nelson Benítez León <[email protected]>
// Copyright (C) 2024 g10 Code GmbH, Author: Sune Stolborg Vuorela <[email protected]>
// Copyright (C) 2024 Vincent Lefevre <[email protected]>
// Copyright (C) 2024 G B <[email protected]>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================
#include <config.h>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cctype>
#include <cmath>
#include <climits>
#include <algorithm>
#include "goo/gmem.h"
#include "Error.h"
#include "Object.h"
#include "Dict.h"
#include "GlobalParams.h"
#include "CMap.h"
#include "CharCodeToUnicode.h"
#include "FontEncodingTables.h"
#include "BuiltinFont.h"
#include "UnicodeTypeTable.h"
#include <fofi/FoFiIdentifier.h>
#include <fofi/FoFiType1.h>
#include <fofi/FoFiType1C.h>
#include <fofi/FoFiTrueType.h>
#include "GfxFont.h"
#include "PSOutputDev.h"
//------------------------------------------------------------------------
struct Base14FontMapEntry
{
const char *altName;
const char *base14Name;
};
static const Base14FontMapEntry base14FontMap[] = { { "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", "Courier" },
{ "Courier,Bold", "Courier-Bold" },
{ "Courier,BoldItalic", "Courier-BoldOblique" },
{ "Courier,Italic", "Courier-Oblique" },
{ "Courier-Bold", "Courier-Bold" },
{ "Courier-BoldOblique", "Courier-BoldOblique" },
{ "Courier-Oblique", "Courier-Oblique" },
{ "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", "Helvetica" },
{ "Helvetica,Bold", "Helvetica-Bold" },
{ "Helvetica,BoldItalic", "Helvetica-BoldOblique" },
{ "Helvetica,Italic", "Helvetica-Oblique" },
{ "Helvetica-Bold", "Helvetica-Bold" },
{ "Helvetica-BoldItalic", "Helvetica-BoldOblique" },
{ "Helvetica-BoldOblique", "Helvetica-BoldOblique" },
{ "Helvetica-Italic", "Helvetica-Oblique" },
{ "Helvetica-Oblique", "Helvetica-Oblique" },
{ "Symbol", "Symbol" },
{ "Symbol,Bold", "Symbol" },
{ "Symbol,BoldItalic", "Symbol" },
{ "Symbol,Italic", "Symbol" },
{ "SymbolMT", "Symbol" },
{ "SymbolMT,Bold", "Symbol" },
{ "SymbolMT,BoldItalic", "Symbol" },
{ "SymbolMT,Italic", "Symbol" },
{ "Times-Bold", "Times-Bold" },
{ "Times-BoldItalic", "Times-BoldItalic" },
{ "Times-Italic", "Times-Italic" },
{ "Times-Roman", "Times-Roman" },
{ "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" },
{ "ZapfDingbats", "ZapfDingbats" } };
//------------------------------------------------------------------------
// index: {fixed:0, sans-serif:4, serif:8} + bold*2 + italic
// NB: must be in same order as psSubstFonts in PSOutputDev.cc
static const char *base14SubstFonts[14] = { "Courier", "Courier-Oblique", "Courier-Bold", "Courier-BoldOblique", "Helvetica", "Helvetica-Oblique", "Helvetica-Bold", "Helvetica-BoldOblique", "Times-Roman", "Times-Italic", "Times-Bold",
"Times-BoldItalic",
// the last two are never used for substitution
"Symbol", "ZapfDingbats" };
//------------------------------------------------------------------------
static int parseCharName(char *charName, Unicode *uBuf, int uLen, bool names, bool ligatures, bool numeric, bool hex, bool variants);
//------------------------------------------------------------------------
static int readFromStream(void *data)
{
return ((Stream *)data)->getChar();
}
//------------------------------------------------------------------------
// GfxFontLoc
//------------------------------------------------------------------------
GfxFontLoc::GfxFontLoc()
{
fontNum = 0;
substIdx = -1;
}
GfxFontLoc::~GfxFontLoc() = default;
GfxFontLoc::GfxFontLoc(GfxFontLoc &&other) noexcept = default;
GfxFontLoc &GfxFontLoc::operator=(GfxFontLoc &&other) noexcept = default;
//------------------------------------------------------------------------
// GfxFont
//------------------------------------------------------------------------
std::unique_ptr<GfxFont> GfxFont::makeFont(XRef *xref, const char *tagA, Ref idA, Dict *fontDict)
{
std::optional<std::string> name;
Ref embFontIDA;
GfxFontType typeA;
// get base font name
Object obj1 = fontDict->lookup("BaseFont");
if (obj1.isName()) {
name = obj1.getName();
}
// There is no BaseFont in Type 3 fonts, try fontDescriptor.FontName
if (!name) {
Object fontDesc = fontDict->lookup("FontDescriptor");
if (fontDesc.isDict()) {
Object obj2 = fontDesc.dictLookup("FontName");
if (obj2.isName()) {
name = obj2.getName();
}
}
}
// As a last resort try the Name key
if (!name) {
Object obj2 = fontDict->lookup("Name");
if (obj2.isName()) {
name = obj2.getName();
}
}
// get embedded font ID and font type
typeA = getFontType(xref, fontDict, &embFontIDA);
// create the font object
if (typeA < fontCIDType0) {
return std::make_unique<Gfx8BitFont>(xref, tagA, idA, std::move(name), typeA, embFontIDA, fontDict);
} else {
return std::make_unique<GfxCIDFont>(xref, tagA, idA, std::move(name), typeA, embFontIDA, fontDict);
}
}
GfxFont::GfxFont(const char *tagA, Ref idA, std::optional<std::string> &&nameA, GfxFontType typeA, Ref embFontIDA) : tag(tagA), id(idA), name(std::move(nameA)), type(typeA)
{
ok = false;
embFontID = embFontIDA;
embFontName = nullptr;
family = nullptr;
stretch = StretchNotDefined;
weight = WeightNotDefined;
hasToUnicode = false;
}
GfxFont::~GfxFont() = default;
bool GfxFont::isSubset() const
{
if (name) {
unsigned int i;
for (i = 0; i < name->size(); ++i) {
if ((*name)[i] < 'A' || (*name)[i] > 'Z') {
break;
}
}
return i == 6 && name->size() > 7 && (*name)[6] == '+';
}
return false;
}
std::string GfxFont::getNameWithoutSubsetTag() const
{
if (!name) {
return {};
}
if (!isSubset()) {
return *name;
}
return name->substr(7);
}
// This function extracts three pieces of information:
// 1. the "expected" font type, i.e., the font type implied by
// Font.Subtype, DescendantFont.Subtype, and
// FontDescriptor.FontFile3.Subtype
// 2. the embedded font object ID
// 3. the actual font type - determined by examining the embedded font
// if there is one, otherwise equal to the expected font type
// If the expected and actual font types don't match, a warning
// message is printed. The expected font type is not used for
// anything else.
GfxFontType GfxFont::getFontType(XRef *xref, Dict *fontDict, Ref *embID)
{
GfxFontType t, expectedType;
FoFiIdentifierType fft;
Dict *fontDict2;
bool isType0, err;
t = fontUnknownType;
*embID = Ref::INVALID();
err = false;
Object subtype = fontDict->lookup("Subtype");
expectedType = fontUnknownType;
isType0 = false;
if (subtype.isName("Type1") || subtype.isName("MMType1")) {
expectedType = fontType1;
} else if (subtype.isName("Type1C")) {
expectedType = fontType1C;
} else if (subtype.isName("Type3")) {
expectedType = fontType3;
} else if (subtype.isName("TrueType")) {
expectedType = fontTrueType;
} else if (subtype.isName("Type0")) {
isType0 = true;
} else {
error(errSyntaxWarning, -1, "Unknown font type: '{0:s}'", subtype.isName() ? subtype.getName() : "???");
}
fontDict2 = fontDict;
Object obj1 = fontDict->lookup("DescendantFonts");
Object obj2; // Do not move to inside the if
// we need it around so that fontDict2 remains valid
if (obj1.isArray()) {
if (obj1.arrayGetLength() == 0) {
error(errSyntaxWarning, -1, "Empty DescendantFonts array in font");
} else {
obj2 = obj1.arrayGet(0);
if (obj2.isDict()) {
if (!isType0) {
error(errSyntaxWarning, -1, "Non-CID font with DescendantFonts array");
}
fontDict2 = obj2.getDict();
subtype = fontDict2->lookup("Subtype");
if (subtype.isName("CIDFontType0")) {
if (isType0) {
expectedType = fontCIDType0;
}
} else if (subtype.isName("CIDFontType2")) {
if (isType0) {
expectedType = fontCIDType2;
}
}
}
}
}
Object fontDesc = fontDict2->lookup("FontDescriptor");
if (fontDesc.isDict()) {
Object obj3 = fontDesc.dictLookupNF("FontFile").copy();
if (obj3.isRef()) {
*embID = obj3.getRef();
if (expectedType != fontType1) {
err = true;
}
}
if (*embID == Ref::INVALID() && (obj3 = fontDesc.dictLookupNF("FontFile2").copy(), obj3.isRef())) {
*embID = obj3.getRef();
if (isType0) {
expectedType = fontCIDType2;
} else if (expectedType != fontTrueType) {
err = true;
}
}
if (*embID == Ref::INVALID() && (obj3 = fontDesc.dictLookupNF("FontFile3").copy(), obj3.isRef())) {
*embID = obj3.getRef();
Object obj4 = obj3.fetch(xref);
if (obj4.isStream()) {
subtype = obj4.streamGetDict()->lookup("Subtype");
if (subtype.isName("Type1")) {
if (expectedType != fontType1) {
err = true;
expectedType = isType0 ? fontCIDType0 : fontType1;
}
} else if (subtype.isName("Type1C")) {
if (expectedType == fontType1) {
expectedType = fontType1C;
} else if (expectedType != fontType1C) {
err = true;
expectedType = isType0 ? fontCIDType0C : fontType1C;
}
} else if (subtype.isName("TrueType")) {
if (expectedType != fontTrueType) {
err = true;
expectedType = isType0 ? fontCIDType2 : fontTrueType;
}
} else if (subtype.isName("CIDFontType0C")) {
if (expectedType == fontCIDType0) {
expectedType = fontCIDType0C;
} else {
err = true;
expectedType = isType0 ? fontCIDType0C : fontType1C;
}
} else if (subtype.isName("OpenType")) {
if (expectedType == fontTrueType) {
expectedType = fontTrueTypeOT;
} else if (expectedType == fontType1) {
expectedType = fontType1COT;
} else if (expectedType == fontCIDType0) {
expectedType = fontCIDType0COT;
} else if (expectedType == fontCIDType2) {
expectedType = fontCIDType2OT;
} else {
err = true;
}
} else {
error(errSyntaxError, -1, "Unknown font type '{0:s}'", subtype.isName() ? subtype.getName() : "???");
}
}
}
}
t = fontUnknownType;
if (*embID != Ref::INVALID()) {
Object obj3(*embID);
Object obj4 = obj3.fetch(xref);
if (obj4.isStream()) {
obj4.streamReset();
fft = FoFiIdentifier::identifyStream(&readFromStream, obj4.getStream());
obj4.streamClose();
switch (fft) {
case fofiIdType1PFA:
case fofiIdType1PFB:
t = fontType1;
break;
case fofiIdCFF8Bit:
t = isType0 ? fontCIDType0C : fontType1C;
break;
case fofiIdCFFCID:
t = fontCIDType0C;
break;
case fofiIdTrueType:
case fofiIdTrueTypeCollection:
t = isType0 ? fontCIDType2 : fontTrueType;
break;
case fofiIdOpenTypeCFF8Bit:
t = isType0 ? fontCIDType0COT : fontType1COT;
break;
case fofiIdOpenTypeCFFCID:
t = fontCIDType0COT;
break;
default:
error(errSyntaxError, -1, "Embedded font file may be invalid");
break;
}
}
}
if (t == fontUnknownType) {
t = expectedType;
}
if (t != expectedType) {
err = true;
}
if (err) {
error(errSyntaxWarning, -1, "Mismatch between font type and embedded font file");
}
return t;
}
void GfxFont::readFontDescriptor(XRef *xref, Dict *fontDict)
{
double t;
// assume Times-Roman by default (for substitution purposes)
flags = fontSerif;
missingWidth = 0;
Object obj1 = fontDict->lookup("FontDescriptor");
if (obj1.isDict()) {
// get flags
Object obj2 = obj1.dictLookup("Flags");
if (obj2.isInt()) {
flags = obj2.getInt();
}
// get name
obj2 = obj1.dictLookup("FontName");
if (obj2.isName()) {
embFontName = std::make_unique<GooString>(obj2.getName());
}
if (embFontName == nullptr) {
// get name with typo
obj2 = obj1.dictLookup("Fontname");
if (obj2.isName()) {
embFontName = std::make_unique<GooString>(obj2.getName());
error(errSyntaxWarning, -1, "The file uses Fontname instead of FontName please notify the creator that the file is broken");
}
}
// get family
obj2 = obj1.dictLookup("FontFamily");
if (obj2.isString()) {
family = std::make_unique<GooString>(obj2.getString());
}
// get stretch
obj2 = obj1.dictLookup("FontStretch");
if (obj2.isName()) {
if (strcmp(obj2.getName(), "UltraCondensed") == 0) {
stretch = UltraCondensed;
} else if (strcmp(obj2.getName(), "ExtraCondensed") == 0) {
stretch = ExtraCondensed;
} else if (strcmp(obj2.getName(), "Condensed") == 0) {
stretch = Condensed;
} else if (strcmp(obj2.getName(), "SemiCondensed") == 0) {
stretch = SemiCondensed;
} else if (strcmp(obj2.getName(), "Normal") == 0) {
stretch = Normal;
} else if (strcmp(obj2.getName(), "SemiExpanded") == 0) {
stretch = SemiExpanded;
} else if (strcmp(obj2.getName(), "Expanded") == 0) {
stretch = Expanded;
} else if (strcmp(obj2.getName(), "ExtraExpanded") == 0) {
stretch = ExtraExpanded;
} else if (strcmp(obj2.getName(), "UltraExpanded") == 0) {
stretch = UltraExpanded;
} else {
error(errSyntaxWarning, -1, "Invalid Font Stretch");
}
}
// get weight
obj2 = obj1.dictLookup("FontWeight");
if (obj2.isNum()) {
if (obj2.getNum() == 100) {
weight = W100;
} else if (obj2.getNum() == 200) {
weight = W200;
} else if (obj2.getNum() == 300) {
weight = W300;
} else if (obj2.getNum() == 400) {
weight = W400;
} else if (obj2.getNum() == 500) {
weight = W500;
} else if (obj2.getNum() == 600) {
weight = W600;
} else if (obj2.getNum() == 700) {
weight = W700;
} else if (obj2.getNum() == 800) {
weight = W800;
} else if (obj2.getNum() == 900) {
weight = W900;
} else {
error(errSyntaxWarning, -1, "Invalid Font Weight");
}
}
// look for MissingWidth
obj2 = obj1.dictLookup("MissingWidth");
if (obj2.isNum()) {
missingWidth = obj2.getNum();
}
// get Ascent and Descent
obj2 = obj1.dictLookup("Ascent");
if (obj2.isNum()) {
t = 0.001 * obj2.getNum();
// some broken font descriptors specify a negative ascent
if (t < 0) {
t = -t;
}
// some broken font descriptors set ascent and descent to 0;
// others set it to ridiculous values (e.g., 32768)
if (t != 0 && t < 3) {
ascent = t;
}
}
obj2 = obj1.dictLookup("Descent");
if (obj2.isNum()) {
t = 0.001 * obj2.getNum();
// some broken font descriptors specify a positive descent
if (t > 0) {
t = -t;
}
// some broken font descriptors set ascent and descent to 0
if (t != 0 && t > -3) {
descent = t;
}
}
// font FontBBox
obj2 = obj1.dictLookup("FontBBox");
if (obj2.isArray()) {
for (int i = 0; i < 4 && i < obj2.arrayGetLength(); ++i) {
Object obj3 = obj2.arrayGet(i);
if (obj3.isNum()) {
fontBBox[i] = 0.001 * obj3.getNum();
}
}
}
}
}
std::unique_ptr<CharCodeToUnicode> GfxFont::readToUnicodeCMap(Dict *fontDict, int nBits, std::unique_ptr<CharCodeToUnicode> ctu)
{
Object obj1 = fontDict->lookup("ToUnicode");
if (!obj1.isStream()) {
return ctu;
}
auto buf = std::make_unique<GooString>();
obj1.getStream()->fillGooString(buf.get());
obj1.streamClose();
if (ctu) {
ctu->mergeCMap(buf.get(), nBits);
} else {
ctu = CharCodeToUnicode::parseCMap(buf.get(), nBits);
}
hasToUnicode = true;
return ctu;
}
std::optional<GfxFontLoc> GfxFont::locateFont(XRef *xref, PSOutputDev *ps, GooString *substituteFontName)
{
SysFontType sysFontType;
std::optional<std::string> path;
GooString *base14Name;
int substIdx, fontNum;
bool embed;
if (type == fontType3) {
return std::nullopt;
}
//----- embedded font
if (embFontID != Ref::INVALID()) {
embed = true;
Object refObj(embFontID);
Object embFontObj = refObj.fetch(xref);
if (!embFontObj.isStream()) {
error(errSyntaxError, -1, "Embedded font object is wrong type");
embed = false;
}
if (embed) {
if (ps) {
switch (type) {
case fontType1:
case fontType1C:
case fontType1COT:
embed = ps->getEmbedType1();
break;
case fontTrueType:
case fontTrueTypeOT:
embed = ps->getEmbedTrueType();
break;
case fontCIDType0C:
case fontCIDType0COT:
embed = ps->getEmbedCIDPostScript();
break;
case fontCIDType2:
case fontCIDType2OT:
embed = ps->getEmbedCIDTrueType();
break;
default:
break;
}
}
if (embed) {
GfxFontLoc fontLoc;
fontLoc.locType = gfxFontLocEmbedded;
fontLoc.fontType = type;
fontLoc.embFontID = embFontID;
return fontLoc;
}
}
}
//----- PS passthrough
if (ps && !isCIDFont() && ps->getFontPassthrough()) {
GfxFontLoc fontLoc;
fontLoc.locType = gfxFontLocResident;
fontLoc.fontType = fontType1;
fontLoc.path = name.value_or(std::string());
return fontLoc;
}
//----- PS resident Base-14 font
if (ps && !isCIDFont() && ((Gfx8BitFont *)this)->base14) {
GfxFontLoc fontLoc;
fontLoc.locType = gfxFontLocResident;
fontLoc.fontType = fontType1;
fontLoc.path = ((Gfx8BitFont *)this)->base14->base14Name;
return fontLoc;
}
//----- external font file (fontFile, fontDir)
if (name && (path = globalParams->findFontFile(*name))) {
if (std::optional<GfxFontLoc> fontLoc = getExternalFont(*path, isCIDFont())) {
return fontLoc;
}
}
//----- external font file for Base-14 font
if (!ps && !isCIDFont() && ((Gfx8BitFont *)this)->base14) {
base14Name = new GooString(((Gfx8BitFont *)this)->base14->base14Name);
if ((path = globalParams->findBase14FontFile(base14Name, this, substituteFontName))) {
if (std::optional<GfxFontLoc> fontLoc = getExternalFont(*path, false)) {
delete base14Name;
return fontLoc;
}
}
delete base14Name;
}
//----- system font
if ((path = globalParams->findSystemFontFile(this, &sysFontType, &fontNum, substituteFontName))) {
if (isCIDFont()) {
if (sysFontType == sysFontTTF || sysFontType == sysFontTTC) {
GfxFontLoc fontLoc;
fontLoc.locType = gfxFontLocExternal;
fontLoc.fontType = fontCIDType2;
fontLoc.path = *path;
fontLoc.fontNum = fontNum;
return fontLoc;
}
} else {
GfxFontLoc fontLoc;
fontLoc.path = *path;
fontLoc.locType = gfxFontLocExternal;
if (sysFontType == sysFontTTF || sysFontType == sysFontTTC) {
fontLoc.fontType = fontTrueType;
} else if (sysFontType == sysFontPFA || sysFontType == sysFontPFB) {
fontLoc.fontType = fontType1;
fontLoc.fontNum = fontNum;
}
return fontLoc;
}
}
if (!isCIDFont()) {
//----- 8-bit font substitution
if (flags & fontFixedWidth) {
substIdx = 0;
} else if (flags & fontSerif) {
substIdx = 8;
} else {
substIdx = 4;
}
if (isBold()) {
substIdx += 2;
}
if (isItalic()) {
substIdx += 1;
}
const std::string substName = base14SubstFonts[substIdx];
if (ps) {
error(errSyntaxWarning, -1, "Substituting font '{0:s}' for '{1:s}'", base14SubstFonts[substIdx], name ? name->c_str() : "null");
GfxFontLoc fontLoc;
fontLoc.locType = gfxFontLocResident;
fontLoc.fontType = fontType1;
fontLoc.path = substName;
fontLoc.substIdx = substIdx;
return fontLoc;
} else {
path = globalParams->findFontFile(substName);
if (path) {
if (std::optional<GfxFontLoc> fontLoc = getExternalFont(*path, false)) {
error(errSyntaxWarning, -1, "Substituting font '{0:s}' for '{1:s}'", base14SubstFonts[substIdx], name ? name->c_str() : "");
name = base14SubstFonts[substIdx];
fontLoc->substIdx = substIdx;
return fontLoc;
}
}
}
// failed to find a substitute font
return std::nullopt;
}
// failed to find a substitute font
return std::nullopt;
}
std::optional<GfxFontLoc> GfxFont::getExternalFont(const std::string &path, bool cid)
{
FoFiIdentifierType fft;
GfxFontType fontType;
fft = FoFiIdentifier::identifyFile(path.c_str());
switch (fft) {
case fofiIdType1PFA:
case fofiIdType1PFB:
fontType = fontType1;
break;
case fofiIdCFF8Bit:
fontType = fontType1C;
break;
case fofiIdCFFCID:
fontType = fontCIDType0C;
break;
case fofiIdTrueType:
case fofiIdTrueTypeCollection:
fontType = cid ? fontCIDType2 : fontTrueType;
break;
case fofiIdOpenTypeCFF8Bit:
fontType = fontType1COT;
break;
case fofiIdOpenTypeCFFCID:
fontType = fontCIDType0COT;
break;
case fofiIdUnknown:
case fofiIdError:
default:
fontType = fontUnknownType;
break;
}
if (fontType == fontUnknownType || (cid ? (fontType < fontCIDType0) : (fontType >= fontCIDType0))) {
return std::nullopt;
}
GfxFontLoc fontLoc;
fontLoc.locType = gfxFontLocExternal;
fontLoc.fontType = fontType;
fontLoc.path = path;
return fontLoc;
}
std::optional<std::vector<unsigned char>> GfxFont::readEmbFontFile(XRef *xref)
{
Stream *str;
Object obj1(embFontID);
Object obj2 = obj1.fetch(xref);
if (!obj2.isStream()) {
error(errSyntaxError, -1, "Embedded font file is not a stream");
embFontID = Ref::INVALID();
return {};
}
str = obj2.getStream();
std::vector<unsigned char> buf = str->toUnsignedChars();
str->close();
return buf;
}
struct AlternateNameMap
{
const char *name;
const char *alt;
};
static const AlternateNameMap alternateNameMap[] = { { "fi", "f_i" }, { "fl", "f_l" }, { "ff", "f_f" }, { "ffi", "f_f_i" }, { "ffl", "f_f_l" }, { nullptr, nullptr } };
const char *GfxFont::getAlternateName(const char *name)
{
const AlternateNameMap *map = alternateNameMap;
while (map->name) {
if (strcmp(name, map->name) == 0) {
return map->alt;
}
map++;
}
return nullptr;
}
//------------------------------------------------------------------------
// Gfx8BitFont
//------------------------------------------------------------------------
// Parse character 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 decimal digits.
static bool parseNumericName(const char *s, bool hex, unsigned int *u)
{
char *endptr;
// Strip leading alpha characters.
if (hex) {
int n = 0;
// Get string length while ignoring junk at end.
while (isalnum(s[n])) {
++n;
}
// Only 2 hex characters with optional leading alpha is allowed.
if (n == 3 && isalpha(*s)) {
++s;
} else if (n != 2) {
return false;
}
} else {
// Strip up to two alpha characters.
for (int i = 0; i < 2 && isalpha(*s); ++i) {
++s;
}
}
int v = strtol(s, &endptr, hex ? 16 : 10);
if (endptr == s) {
return false;
}
// Skip trailing junk characters.
while (*endptr != '\0' && !isalnum(*endptr)) {
++endptr;
}
if (*endptr == '\0') {
if (u) {
*u = v;
}
return true;
}
return false;
}
// Returns true if the font has character names like xx or Axx which
// should be parsed for hex or decimal values.
static bool testForNumericNames(Dict *fontDict, bool hex)
{
bool numeric = true;
Object enc = fontDict->lookup("Encoding");
if (!enc.isDict()) {
return false;
}
Object diff = enc.dictLookup("Differences");
if (!diff.isArray()) {
return false;
}
for (int i = 0; i < diff.arrayGetLength() && numeric; ++i) {
Object obj = diff.arrayGet(i);
if (obj.isInt()) {
// All sequences must start between character codes 0 and 5.
if (obj.getInt() > 5) {
numeric = false;
}
} else if (obj.isName()) {
// All character names must successfully parse.
if (!parseNumericName(obj.getName(), hex, nullptr)) {
numeric = false;
}
} else {
numeric = false;
}
}
return numeric;
}
Gfx8BitFont::Gfx8BitFont(XRef *xref, const char *tagA, Ref idA, std::optional<std::string> &&nameA, GfxFontType typeA, Ref embFontIDA, Dict *fontDict) : GfxFont(tagA, idA, std::move(nameA), typeA, embFontIDA)
{
const BuiltinFont *builtinFont;
const char **baseEnc;
bool baseEncFromFontFile;
int len;
FoFiType1 *ffT1;
FoFiType1C *ffT1C;
char *charName;
bool missing, hex;
bool numeric;
Unicode toUnicode[256];
Unicode uBuf[8];
double mul;
int firstChar, lastChar;
unsigned short w;
Object obj1;
int n, a, b, m;
// do font name substitution for various aliases of the Base 14 font
// names
base14 = nullptr;
if (name) {
std::string name2 = *name;
size_t i = 0;
while (i < name2.size()) {
if (name2[i] == ' ') {
name2.erase(i, 1);
} else {
++i;
}
}
a = 0;
b = sizeof(base14FontMap) / sizeof(Base14FontMapEntry);
// invariant: base14FontMap[a].altName <= name2 < base14FontMap[b].altName
while (b - a > 1) {
m = (a + b) / 2;
if (name2.compare(base14FontMap[m].altName) >= 0) {
a = m;
} else {
b = m;
}
}
if (name2 == base14FontMap[a].altName) {
base14 = &base14FontMap[a];
}
}
// is it a built-in font?
builtinFont = nullptr;
if (base14) {
for (const BuiltinFont &bf : builtinFonts) {
if (!strcmp(base14->base14Name, bf.name)) {
builtinFont = &bf;
break;