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skia / third_party / poppler / 39a8b10181d77fff8846df2cff236a3105dd03a5 / . / fofi / FoFiTrueType.cc
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//========================================================================
//
// FoFiTrueType.cc
//
// Copyright 1999-2003 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) 2006 Takashi Iwai <tiwai@suse.de>
// Copyright (C) 2007 Koji Otani <sho@bbr.jp>
// Copyright (C) 2007 Carlos Garcia Campos <carlosgc@gnome.org>
// Copyright (C) 2008, 2009, 2012, 2014-2018 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2008 Tomas Are Haavet <tomasare@gmail.com>
// Copyright (C) 2012 Suzuki Toshiya <mpsuzuki@hiroshima-u.ac.jp>
// Copyright (C) 2012, 2017 Adrian Johnson <ajohnson@redneon.com>
// Copyright (C) 2014 Thomas Freitag <Thomas.Freitag@alfa.de>
// Copyright (C) 2015 Aleksei Volkov <Aleksei Volkov>
// Copyright (C) 2015, 2016 William Bader <williambader@hotmail.com>
// Copyright (C) 2018 Adam Reichold <adam.reichold@t-online.de>
//
// 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 <stdlib.h>
#include <string.h>
#include <limits.h>
#include <algorithm>
#include "goo/gmem.h"
#include "goo/GooLikely.h"
#include "goo/GooString.h"
#include "FoFiType1C.h"
#include "FoFiTrueType.h"
#include "poppler/Error.h"
//
// Terminology
// -----------
//
// character code = number used as an element of a text string
//
// character name = glyph name = name for a particular glyph within a
// font
//
// glyph index = GID = position (within some internal table in the font)
// where the instructions to draw a particular glyph are
// stored
//
// Type 1 fonts
// ------------
//
// Type 1 fonts contain:
//
// Encoding: array of glyph names, maps char codes to glyph names
//
// Encoding[charCode] = charName
//
// CharStrings: dictionary of instructions, keyed by character names,
// maps character name to glyph data
//
// CharStrings[charName] = glyphData
//
// TrueType fonts
// --------------
//
// TrueType fonts contain:
//
// 'cmap' table: mapping from character code to glyph index; there may
// be multiple cmaps in a TrueType font
//
// cmap[charCode] = gid
//
// 'post' table: mapping from glyph index to glyph name
//
// post[gid] = glyphName
//
// Type 42 fonts
// -------------
//
// Type 42 fonts contain:
//
// Encoding: array of glyph names, maps char codes to glyph names
//
// Encoding[charCode] = charName
//
// CharStrings: dictionary of glyph indexes, keyed by character names,
// maps character name to glyph index
//
// CharStrings[charName] = gid
//
//------------------------------------------------------------------------
#define ttcfTag 0x74746366
//------------------------------------------------------------------------
struct TrueTypeTable {
unsigned int tag;
unsigned int checksum;
int offset;
int origOffset;
int len;
};
struct TrueTypeCmap {
int platform;
int encoding;
int offset;
int len;
int fmt;
};
struct TrueTypeLoca {
int idx;
int origOffset;
int newOffset;
int len;
};
#define cmapTag 0x636d6170
#define glyfTag 0x676c7966
#define headTag 0x68656164
#define hheaTag 0x68686561
#define hmtxTag 0x686d7478
#define locaTag 0x6c6f6361
#define nameTag 0x6e616d65
#define os2Tag 0x4f532f32
#define postTag 0x706f7374
#define vrt2Tag 0x76727432
#define vertTag 0x76657274
struct cmpTrueTypeLocaOffsetFunctor {
bool operator()(const TrueTypeLoca loca1, const TrueTypeLoca loca2) {
if (loca1.origOffset == loca2.origOffset) {
return loca1.idx < loca2.idx;
}
return loca1.origOffset < loca2.origOffset;
}
};
struct cmpTrueTypeLocaIdxFunctor {
bool operator()(const TrueTypeLoca loca1, const TrueTypeLoca loca2) {
return loca1.idx < loca2.idx;
}
};
struct cmpTrueTypeTableTagFunctor {
bool operator()(const TrueTypeTable &tab1, const TrueTypeTable &tab2) {
return tab1.tag < tab2.tag;
}
};
//------------------------------------------------------------------------
struct T42Table {
const char *tag; // 4-byte tag
bool required; // required by the TrueType spec?
};
// TrueType tables to be embedded in Type 42 fonts.
// NB: the table names must be in alphabetical order here.
#define nT42Tables 11
static T42Table t42Tables[nT42Tables] = {
{ "cvt ", true },
{ "fpgm", true },
{ "glyf", true },
{ "head", true },
{ "hhea", true },
{ "hmtx", true },
{ "loca", true },
{ "maxp", true },
{ "prep", true },
{ "vhea", false },
{ "vmtx", false }
};
#define t42HeadTable 3
#define t42LocaTable 6
#define t42GlyfTable 2
#define t42VheaTable 9
#define t42VmtxTable 10
//------------------------------------------------------------------------
// Glyph names in some arbitrary standard order that Apple uses for
// their TrueType fonts.
static const char *macGlyphNames[258] = {
".notdef", "null", "CR", "space",
"exclam", "quotedbl", "numbersign", "dollar",
"percent", "ampersand", "quotesingle", "parenleft",
"parenright", "asterisk", "plus", "comma",
"hyphen", "period", "slash", "zero",
"one", "two", "three", "four",
"five", "six", "seven", "eight",
"nine", "colon", "semicolon", "less",
"equal", "greater", "question", "at",
"A", "B", "C", "D",
"E", "F", "G", "H",
"I", "J", "K", "L",
"M", "N", "O", "P",
"Q", "R", "S", "T",
"U", "V", "W", "X",
"Y", "Z", "bracketleft", "backslash",
"bracketright", "asciicircum", "underscore", "grave",
"a", "b", "c", "d",
"e", "f", "g", "h",
"i", "j", "k", "l",
"m", "n", "o", "p",
"q", "r", "s", "t",
"u", "v", "w", "x",
"y", "z", "braceleft", "bar",
"braceright", "asciitilde", "Adieresis", "Aring",
"Ccedilla", "Eacute", "Ntilde", "Odieresis",
"Udieresis", "aacute", "agrave", "acircumflex",
"adieresis", "atilde", "aring", "ccedilla",
"eacute", "egrave", "ecircumflex", "edieresis",
"iacute", "igrave", "icircumflex", "idieresis",
"ntilde", "oacute", "ograve", "ocircumflex",
"odieresis", "otilde", "uacute", "ugrave",
"ucircumflex", "udieresis", "dagger", "degree",
"cent", "sterling", "section", "bullet",
"paragraph", "germandbls", "registered", "copyright",
"trademark", "acute", "dieresis", "notequal",
"AE", "Oslash", "infinity", "plusminus",
"lessequal", "greaterequal", "yen", "mu",
"partialdiff", "summation", "product", "pi",
"integral", "ordfeminine", "ordmasculine", "Omega",
"ae", "oslash", "questiondown", "exclamdown",
"logicalnot", "radical", "florin", "approxequal",
"increment", "guillemotleft", "guillemotright", "ellipsis",
"nbspace", "Agrave", "Atilde", "Otilde",
"OE", "oe", "endash", "emdash",
"quotedblleft", "quotedblright", "quoteleft", "quoteright",
"divide", "lozenge", "ydieresis", "Ydieresis",
"fraction", "currency", "guilsinglleft", "guilsinglright",
"fi", "fl", "daggerdbl", "periodcentered",
"quotesinglbase", "quotedblbase", "perthousand", "Acircumflex",
"Ecircumflex", "Aacute", "Edieresis", "Egrave",
"Iacute", "Icircumflex", "Idieresis", "Igrave",
"Oacute", "Ocircumflex", "applelogo", "Ograve",
"Uacute", "Ucircumflex", "Ugrave", "dotlessi",
"circumflex", "tilde", "overscore", "breve",
"dotaccent", "ring", "cedilla", "hungarumlaut",
"ogonek", "caron", "Lslash", "lslash",
"Scaron", "scaron", "Zcaron", "zcaron",
"brokenbar", "Eth", "eth", "Yacute",
"yacute", "Thorn", "thorn", "minus",
"multiply", "onesuperior", "twosuperior", "threesuperior",
"onehalf", "onequarter", "threequarters", "franc",
"Gbreve", "gbreve", "Idot", "Scedilla",
"scedilla", "Cacute", "cacute", "Ccaron",
"ccaron", "dmacron"
};
//------------------------------------------------------------------------
// FoFiTrueType
//------------------------------------------------------------------------
FoFiTrueType *FoFiTrueType::make(const char *fileA, int lenA, int faceIndexA) {
FoFiTrueType *ff;
ff = new FoFiTrueType(fileA, lenA, false, faceIndexA);
if (!ff->parsedOk) {
delete ff;
return nullptr;
}
return ff;
}
FoFiTrueType *FoFiTrueType::load(const char *fileName, int faceIndexA) {
FoFiTrueType *ff;
char *fileA;
int lenA;
if (!(fileA = FoFiBase::readFile(fileName, &lenA))) {
return nullptr;
}
ff = new FoFiTrueType(fileA, lenA, true, faceIndexA);
if (!ff->parsedOk) {
delete ff;
return nullptr;
}
return ff;
}
FoFiTrueType::FoFiTrueType(const char *fileA, int lenA, bool freeFileDataA, int faceIndexA):
FoFiBase(fileA, lenA, freeFileDataA)
{
tables = nullptr;
nTables = 0;
cmaps = nullptr;
nCmaps = 0;
parsedOk = false;
faceIndex = faceIndexA;
gsubFeatureTable = 0;
gsubLookupList = 0;
parse();
}
FoFiTrueType::~FoFiTrueType() {
gfree(tables);
gfree(cmaps);
}
int FoFiTrueType::getNumCmaps() const {
return nCmaps;
}
int FoFiTrueType::getCmapPlatform(int i) const {
return cmaps[i].platform;
}
int FoFiTrueType::getCmapEncoding(int i) const {
return cmaps[i].encoding;
}
int FoFiTrueType::findCmap(int platform, int encoding) const {
int i;
for (i = 0; i < nCmaps; ++i) {
if (cmaps[i].platform == platform && cmaps[i].encoding == encoding) {
return i;
}
}
return -1;
}
int FoFiTrueType::mapCodeToGID(int i, unsigned int c) const {
int gid;
unsigned int segCnt, segEnd, segStart, segDelta, segOffset;
unsigned int cmapFirst, cmapLen;
int pos, a, b, m;
bool ok;
if (i < 0 || i >= nCmaps) {
return 0;
}
ok = true;
pos = cmaps[i].offset;
switch (cmaps[i].fmt) {
case 0:
if (c + 6 >= (unsigned int)cmaps[i].len) {
return 0;
}
gid = getU8(cmaps[i].offset + 6 + c, &ok);
break;
case 4:
segCnt = getU16BE(pos + 6, &ok) / 2;
a = -1;
b = segCnt - 1;
segEnd = getU16BE(pos + 14 + 2*b, &ok);
if (c > segEnd) {
// malformed font -- the TrueType spec requires the last segEnd
// to be 0xffff
return 0;
}
// invariant: seg[a].end < code <= seg[b].end
while (b - a > 1 && ok) {
m = (a + b) / 2;
segEnd = getU16BE(pos + 14 + 2*m, &ok);
if (segEnd < c) {
a = m;
} else {
b = m;
}
}
segStart = getU16BE(pos + 16 + 2*segCnt + 2*b, &ok);
segDelta = getU16BE(pos + 16 + 4*segCnt + 2*b, &ok);
segOffset = getU16BE(pos + 16 + 6*segCnt + 2*b, &ok);
if (c < segStart) {
return 0;
}
if (segOffset == 0) {
gid = (c + segDelta) & 0xffff;
} else {
gid = getU16BE(pos + 16 + 6*segCnt + 2*b +
segOffset + 2 * (c - segStart), &ok);
if (gid != 0) {
gid = (gid + segDelta) & 0xffff;
}
}
break;
case 6:
cmapFirst = getU16BE(pos + 6, &ok);
cmapLen = getU16BE(pos + 8, &ok);
if (c < cmapFirst || c >= cmapFirst + cmapLen) {
return 0;
}
gid = getU16BE(pos + 10 + 2 * (c - cmapFirst), &ok);
break;
case 12:
segCnt = getU32BE(pos + 12, &ok);
a = -1;
b = segCnt - 1;
segEnd = getU32BE(pos + 16 + 12*b+4, &ok);
if (c > segEnd) {
return 0;
}
// invariant: seg[a].end < code <= seg[b].end
while (b - a > 1 && ok) {
m = (a + b) / 2;
segEnd = getU32BE(pos + 16 + 12*m+4, &ok);
if (segEnd < c) {
a = m;
} else {
b = m;
}
}
segStart = getU32BE(pos + 16 + 12*b, &ok);
segDelta = getU32BE(pos + 16 + 12*b+8, &ok);
if (c < segStart) {
return 0;
}
gid = segDelta + (c-segStart);
break;
default:
return 0;
}
if (!ok) {
return 0;
}
return gid;
}
int FoFiTrueType::mapNameToGID(const char *name) const {
const auto gid = nameToGID.find(name);
if (gid == nameToGID.end()) {
return 0;
}
return gid->second;
}
bool FoFiTrueType::getCFFBlock(char **start, int *length) const {
int i;
if (!openTypeCFF || !tables) {
return false;
}
i = seekTable("CFF ");
if (!checkRegion(tables[i].offset, tables[i].len)) {
return false;
}
*start = (char *)file + tables[i].offset;
*length = tables[i].len;
return true;
}
int *FoFiTrueType::getCIDToGIDMap(int *nCIDs) const {
char *start;
int length;
FoFiType1C *ff;
int *map;
*nCIDs = 0;
if (!getCFFBlock(&start, &length)) {
return nullptr;
}
if (!(ff = FoFiType1C::make(start, length))) {
return nullptr;
}
map = ff->getCIDToGIDMap(nCIDs);
delete ff;
return map;
}
int FoFiTrueType::getEmbeddingRights() const {
int i, fsType;
bool ok;
if ((i = seekTable("OS/2")) < 0) {
return 4;
}
ok = true;
fsType = getU16BE(tables[i].offset + 8, &ok);
if (!ok) {
return 4;
}
if (fsType & 0x0008) {
return 2;
}
if (fsType & 0x0004) {
return 1;
}
if (fsType & 0x0002) {
return 0;
}
return 3;
}
void FoFiTrueType::getFontMatrix(double *mat) const {
char *start;
int length;
FoFiType1C *ff;
if (!getCFFBlock(&start, &length)) {
return;
}
if (!(ff = FoFiType1C::make(start, length))) {
return;
}
ff->getFontMatrix(mat);
delete ff;
}
void FoFiTrueType::convertToType42(const char *psName, char **encoding,
int *codeToGID,
FoFiOutputFunc outputFunc,
void *outputStream) const {
GooString *buf;
int maxUsedGlyph;
bool ok;
if (openTypeCFF) {
return;
}
// write the header
ok = true;
buf = GooString::format("%!PS-TrueTypeFont-{0:2g}\n",
(double)getS32BE(0, &ok) / 65536.0);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
// begin the font dictionary
(*outputFunc)(outputStream, "10 dict begin\n", 14);
(*outputFunc)(outputStream, "/FontName /", 11);
(*outputFunc)(outputStream, psName, strlen(psName));
(*outputFunc)(outputStream, " def\n", 5);
(*outputFunc)(outputStream, "/FontType 42 def\n", 17);
(*outputFunc)(outputStream, "/FontMatrix [1 0 0 1 0 0] def\n", 30);
buf = GooString::format("/FontBBox [{0:d} {1:d} {2:d} {3:d}] def\n",
bbox[0], bbox[1], bbox[2], bbox[3]);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
(*outputFunc)(outputStream, "/PaintType 0 def\n", 17);
// write the guts of the dictionary
cvtEncoding(encoding, outputFunc, outputStream);
cvtCharStrings(encoding, codeToGID, outputFunc, outputStream);
cvtSfnts(outputFunc, outputStream, nullptr, false, &maxUsedGlyph);
// end the dictionary and define the font
(*outputFunc)(outputStream, "FontName currentdict end definefont pop\n", 40);
}
void FoFiTrueType::convertToType1(const char *psName, const char **newEncoding,
bool ascii, FoFiOutputFunc outputFunc,
void *outputStream) const {
char *start;
int length;
FoFiType1C *ff;
if (!getCFFBlock(&start, &length)) {
return;
}
if (!(ff = FoFiType1C::make(start, length))) {
return;
}
ff->convertToType1(psName, newEncoding, ascii, outputFunc, outputStream);
delete ff;
}
void FoFiTrueType::convertToCIDType2(const char *psName,
int *cidMap, int nCIDs,
bool needVerticalMetrics,
FoFiOutputFunc outputFunc,
void *outputStream) const {
GooString *buf;
int cid, maxUsedGlyph;
bool ok;
int i, j, k;
if (openTypeCFF) {
return;
}
// write the header
ok = true;
buf = GooString::format("%!PS-TrueTypeFont-{0:2g}\n",
(double)getS32BE(0, &ok) / 65536.0);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
// begin the font dictionary
(*outputFunc)(outputStream, "20 dict begin\n", 14);
(*outputFunc)(outputStream, "/CIDFontName /", 14);
(*outputFunc)(outputStream, psName, strlen(psName));
(*outputFunc)(outputStream, " def\n", 5);
(*outputFunc)(outputStream, "/CIDFontType 2 def\n", 19);
(*outputFunc)(outputStream, "/FontType 42 def\n", 17);
(*outputFunc)(outputStream, "/CIDSystemInfo 3 dict dup begin\n", 32);
(*outputFunc)(outputStream, " /Registry (Adobe) def\n", 24);
(*outputFunc)(outputStream, " /Ordering (Identity) def\n", 27);
(*outputFunc)(outputStream, " /Supplement 0 def\n", 20);
(*outputFunc)(outputStream, " end def\n", 10);
(*outputFunc)(outputStream, "/GDBytes 2 def\n", 15);
if (cidMap) {
buf = GooString::format("/CIDCount {0:d} def\n", nCIDs);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
if (nCIDs > 32767) {
(*outputFunc)(outputStream, "/CIDMap [", 9);
for (i = 0; i < nCIDs; i += 32768 - 16) {
(*outputFunc)(outputStream, "<\n", 2);
for (j = 0; j < 32768 - 16 && i+j < nCIDs; j += 16) {
(*outputFunc)(outputStream, " ", 2);
for (k = 0; k < 16 && i+j+k < nCIDs; ++k) {
cid = cidMap[i+j+k];
buf = GooString::format("{0:02x}{1:02x}",
(cid >> 8) & 0xff, cid & 0xff);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
}
(*outputFunc)(outputStream, "\n", 1);
}
(*outputFunc)(outputStream, " >", 3);
}
(*outputFunc)(outputStream, "\n", 1);
(*outputFunc)(outputStream, "] def\n", 6);
} else {
(*outputFunc)(outputStream, "/CIDMap <\n", 10);
for (i = 0; i < nCIDs; i += 16) {
(*outputFunc)(outputStream, " ", 2);
for (j = 0; j < 16 && i+j < nCIDs; ++j) {
cid = cidMap[i+j];
buf = GooString::format("{0:02x}{1:02x}",
(cid >> 8) & 0xff, cid & 0xff);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
}
(*outputFunc)(outputStream, "\n", 1);
}
(*outputFunc)(outputStream, "> def\n", 6);
}
} else {
// direct mapping - just fill the string(s) with s[i]=i
buf = GooString::format("/CIDCount {0:d} def\n", nGlyphs);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
if (nGlyphs > 32767) {
(*outputFunc)(outputStream, "/CIDMap [\n", 10);
for (i = 0; i < nGlyphs; i += 32767) {
j = nGlyphs - i < 32767 ? nGlyphs - i : 32767;
buf = GooString::format(" {0:d} string 0 1 {1:d} {{\n", 2 * j, j - 1);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
buf = GooString::format(" 2 copy dup 2 mul exch {0:d} add -8 bitshift put\n",
i);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
buf = GooString::format(" 1 index exch dup 2 mul 1 add exch {0:d} add"
" 255 and put\n", i);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
(*outputFunc)(outputStream, " } for\n", 8);
}
(*outputFunc)(outputStream, "] def\n", 6);
} else {
buf = GooString::format("/CIDMap {0:d} string\n", 2 * nGlyphs);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
buf = GooString::format(" 0 1 {0:d} {{\n", nGlyphs - 1);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
(*outputFunc)(outputStream,
" 2 copy dup 2 mul exch -8 bitshift put\n", 42);
(*outputFunc)(outputStream,
" 1 index exch dup 2 mul 1 add exch 255 and put\n", 50);
(*outputFunc)(outputStream, " } for\n", 8);
(*outputFunc)(outputStream, "def\n", 4);
}
}
(*outputFunc)(outputStream, "/FontMatrix [1 0 0 1 0 0] def\n", 30);
buf = GooString::format("/FontBBox [{0:d} {1:d} {2:d} {3:d}] def\n",
bbox[0], bbox[1], bbox[2], bbox[3]);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
(*outputFunc)(outputStream, "/PaintType 0 def\n", 17);
(*outputFunc)(outputStream, "/Encoding [] readonly def\n", 26);
(*outputFunc)(outputStream, "/CharStrings 1 dict dup begin\n", 30);
(*outputFunc)(outputStream, " /.notdef 0 def\n", 17);
(*outputFunc)(outputStream, " end readonly def\n", 19);
// write the guts of the dictionary
cvtSfnts(outputFunc, outputStream, nullptr, needVerticalMetrics, &maxUsedGlyph);
// end the dictionary and define the font
(*outputFunc)(outputStream,
"CIDFontName currentdict end /CIDFont defineresource pop\n",
56);
}
void FoFiTrueType::convertToCIDType0(const char *psName, int *cidMap, int nCIDs,
FoFiOutputFunc outputFunc,
void *outputStream) const {
char *start;
int length;
FoFiType1C *ff;
if (!getCFFBlock(&start, &length)) {
return;
}
if (!(ff = FoFiType1C::make(start, length))) {
return;
}
ff->convertToCIDType0(psName, cidMap, nCIDs, outputFunc, outputStream);
delete ff;
}
void FoFiTrueType::convertToType0(const char *psName, int *cidMap, int nCIDs,
bool needVerticalMetrics,
int *maxValidGlyph,
FoFiOutputFunc outputFunc,
void *outputStream) const {
GooString *buf;
GooString *sfntsName;
int maxUsedGlyph, n, i, j;
*maxValidGlyph = -1;
if (openTypeCFF) {
return;
}
// write the Type 42 sfnts array
sfntsName = (new GooString(psName))->append("_sfnts");
cvtSfnts(outputFunc, outputStream, sfntsName, needVerticalMetrics,
&maxUsedGlyph);
delete sfntsName;
// write the descendant Type 42 fonts
// (The following is a kludge: nGlyphs is the glyph count from the
// maxp table; maxUsedGlyph is the max glyph number that has a
// non-zero-length description, from the loca table. The problem is
// that some TrueType font subsets fail to change the glyph count,
// i.e., nGlyphs is much larger than maxUsedGlyph+1, which results
// in an unnecessarily huge Type 0 font. But some other PDF files
// have fonts with only zero or one used glyph, and a content stream
// that refers to one of the unused glyphs -- this results in PS
// errors if we simply use maxUsedGlyph+1 for the Type 0 font. So
// we compromise by always defining at least 256 glyphs.)
// Some fonts have a large nGlyphs but maxUsedGlyph of 0.
// These fonts might reference any glyph.
// Return the last written glyph number in maxValidGlyph.
// PSOutputDev::drawString() can use maxValidGlyph to avoid
// referencing zero-length glyphs that we trimmed.
// This allows pdftops to avoid writing huge files while still
// handling the rare PDF that uses a zero-length glyph.
if (cidMap) {
n = nCIDs;
} else if (nGlyphs > maxUsedGlyph + 256) {
if (maxUsedGlyph <= 255) {
n = 256;
} else {
n = maxUsedGlyph + 1;
}
} else {
n = nGlyphs;
}
*maxValidGlyph = n-1;
for (i = 0; i < n; i += 256) {
(*outputFunc)(outputStream, "10 dict begin\n", 14);
(*outputFunc)(outputStream, "/FontName /", 11);
(*outputFunc)(outputStream, psName, strlen(psName));
buf = GooString::format("_{0:02x} def\n", i >> 8);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
(*outputFunc)(outputStream, "/FontType 42 def\n", 17);
(*outputFunc)(outputStream, "/FontMatrix [1 0 0 1 0 0] def\n", 30);
buf = GooString::format("/FontBBox [{0:d} {1:d} {2:d} {3:d}] def\n",
bbox[0], bbox[1], bbox[2], bbox[3]);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
(*outputFunc)(outputStream, "/PaintType 0 def\n", 17);
(*outputFunc)(outputStream, "/sfnts ", 7);
(*outputFunc)(outputStream, psName, strlen(psName));
(*outputFunc)(outputStream, "_sfnts def\n", 11);
(*outputFunc)(outputStream, "/Encoding 256 array\n", 20);
for (j = 0; j < 256 && i+j < n; ++j) {
buf = GooString::format("dup {0:d} /c{1:02x} put\n", j, j);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
}
(*outputFunc)(outputStream, "readonly def\n", 13);
(*outputFunc)(outputStream, "/CharStrings 257 dict dup begin\n", 32);
(*outputFunc)(outputStream, "/.notdef 0 def\n", 15);
for (j = 0; j < 256 && i+j < n; ++j) {
buf = GooString::format("/c{0:02x} {1:d} def\n",
j, cidMap ? cidMap[i+j] : i+j);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
}
(*outputFunc)(outputStream, "end readonly def\n", 17);
(*outputFunc)(outputStream,
"FontName currentdict end definefont pop\n", 40);
}
// write the Type 0 parent font
(*outputFunc)(outputStream, "16 dict begin\n", 14);
(*outputFunc)(outputStream, "/FontName /", 11);
(*outputFunc)(outputStream, psName, strlen(psName));
(*outputFunc)(outputStream, " def\n", 5);
(*outputFunc)(outputStream, "/FontType 0 def\n", 16);
(*outputFunc)(outputStream, "/FontMatrix [1 0 0 1 0 0] def\n", 30);
(*outputFunc)(outputStream, "/FMapType 2 def\n", 16);
(*outputFunc)(outputStream, "/Encoding [\n", 12);
for (i = 0; i < n; i += 256) {
buf = GooString::format("{0:d}\n", i >> 8);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
}
(*outputFunc)(outputStream, "] def\n", 6);
(*outputFunc)(outputStream, "/FDepVector [\n", 14);
for (i = 0; i < n; i += 256) {
(*outputFunc)(outputStream, "/", 1);
(*outputFunc)(outputStream, psName, strlen(psName));
buf = GooString::format("_{0:02x} findfont\n", i >> 8);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
}
(*outputFunc)(outputStream, "] def\n", 6);
(*outputFunc)(outputStream, "FontName currentdict end definefont pop\n", 40);
}
void FoFiTrueType::convertToType0(const char *psName, int *cidMap, int nCIDs,
FoFiOutputFunc outputFunc,
void *outputStream) const {
char *start;
int length;
FoFiType1C *ff;
if (!getCFFBlock(&start, &length)) {
return;
}
if (!(ff = FoFiType1C::make(start, length))) {
return;
}
ff->convertToType0(psName, cidMap, nCIDs, outputFunc, outputStream);
delete ff;
}
void FoFiTrueType::cvtEncoding(char **encoding,
FoFiOutputFunc outputFunc,
void *outputStream) const {
const char *name;
GooString *buf;
int i;
(*outputFunc)(outputStream, "/Encoding 256 array\n", 20);
if (encoding) {
for (i = 0; i < 256; ++i) {
if (!(name = encoding[i])) {
name = ".notdef";
}
buf = GooString::format("dup {0:d} /", i);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
(*outputFunc)(outputStream, name, strlen(name));
(*outputFunc)(outputStream, " put\n", 5);
}
} else {
for (i = 0; i < 256; ++i) {
buf = GooString::format("dup {0:d} /c{1:02x} put\n", i, i);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
}
}
(*outputFunc)(outputStream, "readonly def\n", 13);
}
void FoFiTrueType::cvtCharStrings(char **encoding,
int *codeToGID,
FoFiOutputFunc outputFunc,
void *outputStream) const {
const char *name;
GooString *buf;
char buf2[16];
int i, k;
// always define '.notdef'
(*outputFunc)(outputStream, "/CharStrings 256 dict dup begin\n", 32);
(*outputFunc)(outputStream, "/.notdef 0 def\n", 15);
// if there's no 'cmap' table, punt
if (nCmaps == 0) {
goto err;
}
// map char name to glyph index:
// 1. use encoding to map name to char code
// 2. use codeToGID to map char code to glyph index
// N.B. We do this in reverse order because font subsets can have
// weird encodings that use the same character name twice, and
// the first definition is probably the one we want.
k = 0; // make gcc happy
for (i = 255; i >= 0; --i) {
if (encoding) {
name = encoding[i];
} else {
sprintf(buf2, "c%02x", i);
name = buf2;
}
if (name && strcmp(name, ".notdef")) {
k = codeToGID[i];
// note: Distiller (maybe Adobe's PS interpreter in general)
// doesn't like TrueType fonts that have CharStrings entries
// which point to nonexistent glyphs, hence the (k < nGlyphs)
// test
if (k > 0 && k < nGlyphs) {
(*outputFunc)(outputStream, "/", 1);
(*outputFunc)(outputStream, name, strlen(name));
buf = GooString::format(" {0:d} def\n", k);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
}
}
}
err:
(*outputFunc)(outputStream, "end readonly def\n", 17);
}
void FoFiTrueType::cvtSfnts(FoFiOutputFunc outputFunc,
void *outputStream, GooString *name,
bool needVerticalMetrics,
int *maxUsedGlyph) const {
unsigned char headData[54];
TrueTypeLoca *locaTable;
unsigned char *locaData;
TrueTypeTable newTables[nT42Tables];
unsigned char tableDir[12 + nT42Tables*16];
bool ok;
unsigned int checksum;
int nNewTables;
int glyfTableLen, length, pos, glyfPos, i, j, k, vmtxTabLength;
unsigned char vheaTab[36] = {
0, 1, 0, 0, // table version number
0, 0, // ascent
0, 0, // descent
0, 0, // reserved
0, 0, // max advance height
0, 0, // min top side bearing
0, 0, // min bottom side bearing
0, 0, // y max extent
0, 0, // caret slope rise
0, 1, // caret slope run
0, 0, // caret offset
0, 0, // reserved
0, 0, // reserved
0, 0, // reserved
0, 0, // reserved
0, 0, // metric data format
0, 1 // number of advance heights in vmtx table
};
unsigned char *vmtxTab;
bool needVhea, needVmtx;
int advance;
// construct the 'head' table, zero out the font checksum
i = seekTable("head");
if (i < 0 || i >= nTables) {
return;
}
pos = tables[i].offset;
if (!checkRegion(pos, 54)) {
return;
}
memcpy(headData, file + pos, 54);
headData[8] = headData[9] = headData[10] = headData[11] = (unsigned char)0;
// check for a bogus loca format field in the 'head' table
// (I've encountered fonts with loca format set to 0x0100 instead of 0x0001)
if (locaFmt != 0 && locaFmt != 1) {
headData[50] = 0;
headData[51] = 1;
}
// read the original 'loca' table, pad entries out to 4 bytes, and
// sort it into proper order -- some (non-compliant) fonts have
// out-of-order loca tables; in order to correctly handle the case
// where (compliant) fonts have empty entries in the middle of the
// table, cmpTrueTypeLocaOffset uses offset as its primary sort key,
// and idx as its secondary key (ensuring that adjacent entries with
// the same pos value remain in the same order)
locaTable = (TrueTypeLoca *)gmallocn(nGlyphs + 1, sizeof(TrueTypeLoca));
i = seekTable("loca");
pos = tables[i].offset;
i = seekTable("glyf");
glyfTableLen = tables[i].len;
ok = true;
for (i = 0; i <= nGlyphs; ++i) {
locaTable[i].idx = i;
if (locaFmt) {
locaTable[i].origOffset = (int)getU32BE(pos + i*4, &ok);
} else {
locaTable[i].origOffset = 2 * getU16BE(pos + i*2, &ok);
}
if (locaTable[i].origOffset > glyfTableLen) {
locaTable[i].origOffset = glyfTableLen;
}
}
std::sort(locaTable, locaTable + nGlyphs + 1,
cmpTrueTypeLocaOffsetFunctor());
for (i = 0; i < nGlyphs; ++i) {
locaTable[i].len = locaTable[i+1].origOffset - locaTable[i].origOffset;
}
locaTable[nGlyphs].len = 0;
std::sort(locaTable, locaTable + nGlyphs + 1, cmpTrueTypeLocaIdxFunctor());
pos = 0;
*maxUsedGlyph = -1;
for (i = 0; i <= nGlyphs; ++i) {
locaTable[i].newOffset = pos;
pos += locaTable[i].len;
if (pos & 3) {
pos += 4 - (pos & 3);
}
if (locaTable[i].len > 0) {
*maxUsedGlyph = i;
}
}
// construct the new 'loca' table
locaData = (unsigned char *)gmallocn(nGlyphs + 1, (locaFmt ? 4 : 2));
for (i = 0; i <= nGlyphs; ++i) {
pos = locaTable[i].newOffset;
if (locaFmt) {
locaData[4*i ] = (unsigned char)(pos >> 24);
locaData[4*i+1] = (unsigned char)(pos >> 16);
locaData[4*i+2] = (unsigned char)(pos >> 8);
locaData[4*i+3] = (unsigned char) pos;
} else {
locaData[2*i ] = (unsigned char)(pos >> 9);
locaData[2*i+1] = (unsigned char)(pos >> 1);
}
}
// count the number of tables
nNewTables = 0;
for (i = 0; i < nT42Tables; ++i) {
if (t42Tables[i].required ||
seekTable(t42Tables[i].tag) >= 0) {
++nNewTables;
}
}
vmtxTab = nullptr; // make gcc happy
vmtxTabLength = 0;
advance = 0; // make gcc happy
if (needVerticalMetrics) {
needVhea = seekTable("vhea") < 0;
needVmtx = seekTable("vmtx") < 0;
if (needVhea || needVmtx) {
i = seekTable("head");
advance = getU16BE(tables[i].offset + 18, &ok); // units per em
if (needVhea) {
++nNewTables;
}
if (needVmtx) {
++nNewTables;
}
}
}
// construct the new table headers, including table checksums
// (pad each table out to a multiple of 4 bytes)
pos = 12 + nNewTables*16;
k = 0;
for (i = 0; i < nT42Tables; ++i) {
length = -1;
checksum = 0; // make gcc happy
if (i == t42HeadTable) {
length = 54;
checksum = computeTableChecksum(headData, 54);
} else if (i == t42LocaTable) {
length = (nGlyphs + 1) * (locaFmt ? 4 : 2);
checksum = computeTableChecksum(locaData, length);
} else if (i == t42GlyfTable) {
length = 0;
checksum = 0;
glyfPos = tables[seekTable("glyf")].offset;
for (j = 0; j < nGlyphs; ++j) {
length += locaTable[j].len;
if (length & 3) {
length += 4 - (length & 3);
}
if (checkRegion(glyfPos + locaTable[j].origOffset, locaTable[j].len)) {
checksum +=
computeTableChecksum(file + glyfPos + locaTable[j].origOffset,
locaTable[j].len);
}
}
} else {
if ((j = seekTable(t42Tables[i].tag)) >= 0) {
length = tables[j].len;
if (checkRegion(tables[j].offset, length)) {
checksum = computeTableChecksum(file + tables[j].offset, length);
}
} else if (needVerticalMetrics && i == t42VheaTable) {
vheaTab[10] = advance / 256; // max advance height
vheaTab[11] = advance % 256;
length = sizeof(vheaTab);
checksum = computeTableChecksum(vheaTab, length);
} else if (needVerticalMetrics && i == t42VmtxTable) {
length = 4 + (nGlyphs - 1) * 2;
vmtxTabLength = length;
vmtxTab = (unsigned char *)gmalloc(length);
vmtxTab[0] = advance / 256;
vmtxTab[1] = advance % 256;
for (j = 2; j < length; j += 2) {
vmtxTab[j] = 0;
vmtxTab[j+1] = 0;
}
checksum = computeTableChecksum(vmtxTab, length);
} else if (t42Tables[i].required) {
//~ error(-1, "Embedded TrueType font is missing a required table ('%s')",
//~ t42Tables[i].tag);
length = 0;
checksum = 0;
}
}
if (length >= 0) {
newTables[k].tag = ((t42Tables[i].tag[0] & 0xff) << 24) |
((t42Tables[i].tag[1] & 0xff) << 16) |
((t42Tables[i].tag[2] & 0xff) << 8) |
(t42Tables[i].tag[3] & 0xff);
newTables[k].checksum = checksum;
newTables[k].offset = pos;
newTables[k].len = length;
pos += length;
if (pos & 3) {
pos += 4 - (length & 3);
}
++k;
}
}
// construct the table directory
tableDir[0] = 0x00; // sfnt version
tableDir[1] = 0x01;
tableDir[2] = 0x00;
tableDir[3] = 0x00;
tableDir[4] = 0; // numTables
tableDir[5] = nNewTables;
tableDir[6] = 0; // searchRange
tableDir[7] = (unsigned char)128;
tableDir[8] = 0; // entrySelector
tableDir[9] = 3;
tableDir[10] = 0; // rangeShift
tableDir[11] = (unsigned char)(16 * nNewTables - 128);
pos = 12;
for (i = 0; i < nNewTables; ++i) {
tableDir[pos ] = (unsigned char)(newTables[i].tag >> 24);
tableDir[pos+ 1] = (unsigned char)(newTables[i].tag >> 16);
tableDir[pos+ 2] = (unsigned char)(newTables[i].tag >> 8);
tableDir[pos+ 3] = (unsigned char) newTables[i].tag;
tableDir[pos+ 4] = (unsigned char)(newTables[i].checksum >> 24);
tableDir[pos+ 5] = (unsigned char)(newTables[i].checksum >> 16);
tableDir[pos+ 6] = (unsigned char)(newTables[i].checksum >> 8);
tableDir[pos+ 7] = (unsigned char) newTables[i].checksum;
tableDir[pos+ 8] = (unsigned char)(newTables[i].offset >> 24);
tableDir[pos+ 9] = (unsigned char)(newTables[i].offset >> 16);
tableDir[pos+10] = (unsigned char)(newTables[i].offset >> 8);
tableDir[pos+11] = (unsigned char) newTables[i].offset;
tableDir[pos+12] = (unsigned char)(newTables[i].len >> 24);
tableDir[pos+13] = (unsigned char)(newTables[i].len >> 16);
tableDir[pos+14] = (unsigned char)(newTables[i].len >> 8);
tableDir[pos+15] = (unsigned char) newTables[i].len;
pos += 16;
}
// compute the font checksum and store it in the head table
checksum = computeTableChecksum(tableDir, 12 + nNewTables*16);
for (i = 0; i < nNewTables; ++i) {
checksum += newTables[i].checksum;
}
checksum = 0xb1b0afba - checksum; // because the TrueType spec says so
headData[ 8] = (unsigned char)(checksum >> 24);
headData[ 9] = (unsigned char)(checksum >> 16);
headData[10] = (unsigned char)(checksum >> 8);
headData[11] = (unsigned char) checksum;
// start the sfnts array
if (name) {
(*outputFunc)(outputStream, "/", 1);
(*outputFunc)(outputStream, name->c_str(), name->getLength());
(*outputFunc)(outputStream, " [\n", 3);
} else {
(*outputFunc)(outputStream, "/sfnts [\n", 9);
}
// write the table directory
dumpString(tableDir, 12 + nNewTables*16, outputFunc, outputStream);
// write the tables
for (i = 0; i < nNewTables; ++i) {
if (i == t42HeadTable) {
dumpString(headData, 54, outputFunc, outputStream);
} else if (i == t42LocaTable) {
length = (nGlyphs + 1) * (locaFmt ? 4 : 2);
dumpString(locaData, length, outputFunc, outputStream);
} else if (i == t42GlyfTable) {
glyfPos = tables[seekTable("glyf")].offset;
for (j = 0; j < nGlyphs; ++j) {
if (locaTable[j].len > 0 &&
checkRegion(glyfPos + locaTable[j].origOffset, locaTable[j].len)) {
dumpString(file + glyfPos + locaTable[j].origOffset,
locaTable[j].len, outputFunc, outputStream);
}
}
} else {
// length == 0 means the table is missing and the error was
// already reported during the construction of the table
// headers
if ((length = newTables[i].len) > 0) {
if ((j = seekTable(t42Tables[i].tag)) >= 0 &&
checkRegion(tables[j].offset, tables[j].len)) {
dumpString(file + tables[j].offset, tables[j].len,
outputFunc, outputStream);
} else if (needVerticalMetrics && i == t42VheaTable) {
if (unlikely(length > (int)sizeof(vheaTab))) {
error(errSyntaxWarning, -1, "length bigger than vheaTab size");
length = sizeof(vheaTab);
}
dumpString(vheaTab, length, outputFunc, outputStream);
} else if (needVerticalMetrics && i == t42VmtxTable) {
if (unlikely(length > vmtxTabLength)) {
error(errSyntaxWarning, -1, "length bigger than vmtxTab size");
length = vmtxTabLength;
}
dumpString(vmtxTab, length, outputFunc, outputStream);
}
}
}
}
// end the sfnts array
(*outputFunc)(outputStream, "] def\n", 6);
gfree(locaData);
gfree(locaTable);
if (vmtxTab) {
gfree(vmtxTab);
}
}
void FoFiTrueType::dumpString(const unsigned char *s, int length,
FoFiOutputFunc outputFunc,
void *outputStream) const {
GooString *buf;
int pad, i, j;
(*outputFunc)(outputStream, "<", 1);
for (i = 0; i < length; i += 32) {
for (j = 0; j < 32 && i+j < length; ++j) {
buf = GooString::format("{0:02x}", s[i+j] & 0xff);
(*outputFunc)(outputStream, buf->c_str(), buf->getLength());
delete buf;
}
if (i % (65536 - 32) == 65536 - 64) {
(*outputFunc)(outputStream, ">\n<", 3);
} else if (i+32 < length) {
(*outputFunc)(outputStream, "\n", 1);
}
}
if (length & 3) {
pad = 4 - (length & 3);
for (i = 0; i < pad; ++i) {
(*outputFunc)(outputStream, "00", 2);
}
}
// add an extra zero byte because the Adobe Type 42 spec says so
(*outputFunc)(outputStream, "00>\n", 4);
}
unsigned int FoFiTrueType::computeTableChecksum(const unsigned char *data, int length) const {
unsigned int checksum, word;
int i;
checksum = 0;
for (i = 0; i+3 < length; i += 4) {
word = ((data[i ] & 0xff) << 24) +
((data[i+1] & 0xff) << 16) +
((data[i+2] & 0xff) << 8) +
(data[i+3] & 0xff);
checksum += word;
}
if (length & 3) {
word = 0;
i = length & ~3;
switch (length & 3) {
case 3:
word |= (data[i+2] & 0xff) << 8;
// fallthrough
case 2:
word |= (data[i+1] & 0xff) << 16;
// fallthrough
case 1:
word |= (data[i ] & 0xff) << 24;
break;
}
checksum += word;
}
return checksum;
}
void FoFiTrueType::parse() {
unsigned int topTag;
int pos, ver, i, j;
parsedOk = true;
// look for a collection (TTC)
topTag = getU32BE(0, &parsedOk);
if (!parsedOk) {
return;
}
if (topTag == ttcfTag) {
/* TTC font */
int dircount;
dircount = getU32BE(8, &parsedOk);
if (!parsedOk)
return;
if (! dircount) {
parsedOk = false;
return;
}
if (faceIndex >= dircount)
faceIndex = 0;
pos = getU32BE(12 + faceIndex * 4, &parsedOk);
if (! parsedOk)
return;
} else {
pos = 0;
}
// check the sfnt version
ver = getU32BE(pos, &parsedOk);
if (!parsedOk) {
return;
}
openTypeCFF = ver == 0x4f54544f; // 'OTTO'
// read the table directory
nTables = getU16BE(pos + 4, &parsedOk);
if (!parsedOk) {
return;
}
tables = (TrueTypeTable *)gmallocn(nTables, sizeof(TrueTypeTable));
pos += 12;
j = 0;
for (i = 0; i < nTables; ++i) {
tables[j].tag = getU32BE(pos, &parsedOk);
tables[j].checksum = getU32BE(pos + 4, &parsedOk);
tables[j].offset = (int)getU32BE(pos + 8, &parsedOk);
tables[j].len = (int)getU32BE(pos + 12, &parsedOk);
if (unlikely((tables[j].offset < 0) ||
(tables[j].len < 0) ||
(tables[j].offset < INT_MAX - tables[j].len) ||
(tables[j].len > INT_MAX - tables[j].offset) ||
(tables[j].offset + tables[j].len >= tables[j].offset && tables[j].offset + tables[j].len <= len))) {
// ignore any bogus entries in the table directory
++j;
}
pos += 16;
}
if (nTables != j) {
nTables = j;
tables = (TrueTypeTable *)greallocn_checkoverflow(tables, nTables, sizeof(TrueTypeTable));
}
if (!parsedOk || tables == nullptr) {
return;
}
// check for tables that are required by both the TrueType spec and
// the Type 42 spec
if (seekTable("head") < 0 ||
seekTable("hhea") < 0 ||
seekTable("maxp") < 0 ||
(!openTypeCFF && seekTable("loca") < 0) ||
(!openTypeCFF && seekTable("glyf") < 0) ||
(openTypeCFF && seekTable("CFF ") < 0)) {
parsedOk = false;
return;
}
// read the cmaps
if ((i = seekTable("cmap")) >= 0) {
pos = tables[i].offset + 2;
nCmaps = getU16BE(pos, &parsedOk);
pos += 2;
if (!parsedOk) {
return;
}
cmaps = (TrueTypeCmap *)gmallocn(nCmaps, sizeof(TrueTypeCmap));
for (j = 0; j < nCmaps; ++j) {
cmaps[j].platform = getU16BE(pos, &parsedOk);
cmaps[j].encoding = getU16BE(pos + 2, &parsedOk);
cmaps[j].offset = tables[i].offset + getU32BE(pos + 4, &parsedOk);
pos += 8;
cmaps[j].fmt = getU16BE(cmaps[j].offset, &parsedOk);
cmaps[j].len = getU16BE(cmaps[j].offset + 2, &parsedOk);
}
if (!parsedOk) {
return;
}
} else {
nCmaps = 0;
}
// get the number of glyphs from the maxp table
i = seekTable("maxp");
nGlyphs = getU16BE(tables[i].offset + 4, &parsedOk);
if (!parsedOk) {
return;
}
// get the bbox and loca table format from the head table
i = seekTable("head");
bbox[0] = getS16BE(tables[i].offset + 36, &parsedOk);
bbox[1] = getS16BE(tables[i].offset + 38, &parsedOk);
bbox[2] = getS16BE(tables[i].offset + 40, &parsedOk);
bbox[3] = getS16BE(tables[i].offset + 42, &parsedOk);
locaFmt = getS16BE(tables[i].offset + 50, &parsedOk);
if (!parsedOk) {
return;
}
// read the post table
readPostTable();
}
void FoFiTrueType::readPostTable() {
std::string name;
int tablePos, postFmt, stringIdx, stringPos;
bool ok;
int i, j, n, m;
ok = true;
if ((i = seekTable("post")) < 0) {
return;
}
tablePos = tables[i].offset;
postFmt = getU32BE(tablePos, &ok);
if (!ok) {
goto err;
}
if (postFmt == 0x00010000) {
nameToGID.reserve(258);
for (i = 0; i < 258; ++i) {
nameToGID.emplace(macGlyphNames[i], i);
}
} else if (postFmt == 0x00020000) {
nameToGID.reserve(258);
n = getU16BE(tablePos + 32, &ok);
if (!ok) {
goto err;
}
if (n > nGlyphs) {
n = nGlyphs;
}
stringIdx = 0;
stringPos = tablePos + 34 + 2*n;
for (i = 0; i < n; ++i) {
ok = true;
j = getU16BE(tablePos + 34 + 2*i, &ok);
if (j < 258) {
nameToGID[macGlyphNames[j]] = i;
} else {
j -= 258;
if (j != stringIdx) {
for (stringIdx = 0, stringPos = tablePos + 34 + 2*n;
stringIdx < j;
++stringIdx, stringPos += 1 + getU8(stringPos, &ok)) ;
if (!ok) {
continue;
}
}
m = getU8(stringPos, &ok);
if (!ok || !checkRegion(stringPos + 1, m)) {
continue;
}
name.assign((char *)&file[stringPos + 1], m);
nameToGID[name] = i;
++stringIdx;
stringPos += 1 + m;
}
}
} else if (postFmt == 0x00028000) {
nameToGID.reserve(258);
for (i = 0; i < nGlyphs; ++i) {
j = getU8(tablePos + 32 + i, &ok);
if (!ok) {
continue;
}
if (j < 258) {
nameToGID[macGlyphNames[j]] = i;
}
}
}
return;
err:
nameToGID.clear();
}
int FoFiTrueType::seekTable(const char *tag) const {
unsigned int tagI;
int i;
tagI = ((tag[0] & 0xff) << 24) |
((tag[1] & 0xff) << 16) |
((tag[2] & 0xff) << 8) |
(tag[3] & 0xff);
for (i = 0; i < nTables; ++i) {
if (tables[i].tag == tagI) {
return i;
}
}
return -1;
}
unsigned int FoFiTrueType::charToTag(const char *tagName)
{
int n = strlen(tagName);
unsigned int tag = 0;
int i;
if (n > 4) n = 4;
for (i = 0;i < n;i++) {
tag <<= 8;
tag |= tagName[i] & 0xff;
}
for (;i < 4;i++) {
tag <<= 8;
tag |= ' ';
}
return tag;
}
/*
setup GSUB table data
Only supporting vertical text substitution.
*/
int FoFiTrueType::setupGSUB(const char *scriptName)
{
return setupGSUB(scriptName, nullptr);
}
/*
setup GSUB table data
Only supporting vertical text substitution.
*/
int FoFiTrueType::setupGSUB(const char *scriptName,
const char *languageName)
{
unsigned int gsubTable;
unsigned int i;
unsigned int scriptList, featureList;
unsigned int scriptCount;
unsigned int tag;
unsigned int scriptTable = 0;
unsigned int langSys;
unsigned int featureCount;
unsigned int featureIndex;
unsigned int ftable = 0;
unsigned int llist;
unsigned int scriptTag;
int x;
unsigned int pos;
if (scriptName == nullptr) {
gsubFeatureTable = 0;
return 0;
}
scriptTag = charToTag(scriptName);
/* read GSUB Header */
if ((x = seekTable("GSUB")) < 0) {
return 0; /* GSUB table not found */
}
gsubTable = tables[x].offset;
pos = gsubTable+4;
scriptList = getU16BE(pos,&parsedOk);
pos += 2;
featureList = getU16BE(pos,&parsedOk);
pos += 2;
llist = getU16BE(pos,&parsedOk);
gsubLookupList = llist+gsubTable; /* change to offset from top of file */
/* read script list table */
pos = gsubTable+scriptList;
scriptCount = getU16BE(pos,&parsedOk);
pos += 2;
/* find script */
for (i = 0;i < scriptCount;i++) {
tag = getU32BE(pos,&parsedOk);
pos += 4;
scriptTable = getU16BE(pos,&parsedOk);
pos += 2;
if (tag == scriptTag) {
/* found */
break;
}
}
if (i >= scriptCount) {
/* not found */
return 0;
}
/* read script table */
/* use default language system */
pos = gsubTable+scriptList+scriptTable;
langSys = 0;
if (languageName) {
unsigned int langTag = charToTag(languageName);
unsigned int langCount = getU16BE(pos+2,&parsedOk);
for (i = 0;i < langCount && langSys == 0;i++) {
tag = getU32BE(pos+4+i*(4+2),&parsedOk);
if (tag == langTag) {
langSys = getU16BE(pos+4+i*(4+2)+4,&parsedOk);
}
}
}
if (langSys == 0) {
/* default language system */
langSys = getU16BE(pos,&parsedOk);
}
/* read LangSys table */
if (langSys == 0) {
/* no default LangSys */
return 0;
}
pos = gsubTable+scriptList+scriptTable+langSys+2;
featureIndex = getU16BE(pos,&parsedOk); /* ReqFeatureIndex */
pos += 2;
if (featureIndex != 0xffff) {
unsigned int tpos;
/* read feature record */
tpos = gsubTable+featureList;
featureCount = getU16BE(tpos,&parsedOk);
tpos = gsubTable+featureList+2+featureIndex*(4+2);
tag = getU32BE(tpos,&parsedOk);
tpos += 4;
if (tag == vrt2Tag) {
/* vrt2 is preferred, overwrite vert */
ftable = getU16BE(tpos,&parsedOk);
/* convert to offset from file top */
gsubFeatureTable = ftable+gsubTable+featureList;
return 0;
} else if (tag == vertTag) {
ftable = getU16BE(tpos,&parsedOk);
}
}
featureCount = getU16BE(pos,&parsedOk);
pos += 2;
/* find 'vrt2' or 'vert' feature */
for (i = 0;i < featureCount;i++) {
unsigned int oldPos;
featureIndex = getU16BE(pos,&parsedOk);
pos += 2;
oldPos = pos; /* save position */
/* read feature record */
pos = gsubTable+featureList+2+featureIndex*(4+2);
tag = getU32BE(pos,&parsedOk);
pos += 4;
if (tag == vrt2Tag) {
/* vrt2 is preferred, overwrite vert */
ftable = getU16BE(pos,&parsedOk);
break;
} else if (ftable == 0 && tag == vertTag) {
ftable = getU16BE(pos,&parsedOk);
}
pos = oldPos; /* restore old position */
}
if (ftable == 0) {
/* vert nor vrt2 are not found */
return 0;
}
/* convert to offset from file top */
gsubFeatureTable = ftable+gsubTable+featureList;
return 0;
}
unsigned int FoFiTrueType::doMapToVertGID(unsigned int orgGID)
{
unsigned int lookupCount;
unsigned int lookupListIndex;
unsigned int i;
unsigned int gid = 0;
unsigned int pos;
pos = gsubFeatureTable+2;
lookupCount = getU16BE(pos,&parsedOk);
pos += 2;
for (i = 0;i < lookupCount;i++) {
lookupListIndex = getU16BE(pos,&parsedOk);
pos += 2;
if ((gid = scanLookupList(lookupListIndex,orgGID)) != 0) {
break;
}
}
return gid;
}
unsigned int FoFiTrueType::mapToVertGID(unsigned int orgGID)
{
unsigned int mapped;
if (gsubFeatureTable == 0) return orgGID;
if ((mapped = doMapToVertGID(orgGID)) != 0) {
return mapped;
}
return orgGID;
}
unsigned int FoFiTrueType::scanLookupList(unsigned int listIndex, unsigned int orgGID)
{
unsigned int lookupTable;
unsigned int subTableCount;
unsigned int subTable;
unsigned int i;
unsigned int gid = 0;
unsigned int pos;
if (gsubLookupList == 0) return 0; /* no lookup list */
pos = gsubLookupList+2+listIndex*2;
lookupTable = getU16BE(pos,&parsedOk);
/* read lookup table */
pos = gsubLookupList+lookupTable+4;
subTableCount = getU16BE(pos,&parsedOk);
pos += 2;;
for (i = 0;i < subTableCount;i++) {
subTable = getU16BE(pos,&parsedOk);
pos += 2;
if ((gid = scanLookupSubTable(gsubLookupList+lookupTable+subTable,orgGID))
!= 0) break;
}
return gid;
}
unsigned int FoFiTrueType::scanLookupSubTable(unsigned int subTable, unsigned int orgGID)
{
unsigned int format;
unsigned int coverage;
int delta;
int glyphCount;
unsigned int substitute;
unsigned int gid = 0;
int coverageIndex;
int pos;
pos = subTable;
format = getU16BE(pos,&parsedOk);
pos += 2;
coverage = getU16BE(pos,&parsedOk);
pos += 2;
if ((coverageIndex =
checkGIDInCoverage(subTable+coverage,orgGID)) >= 0) {
switch (format) {
case 1:
/* format 1 */
delta = getS16BE(pos,&parsedOk);
pos += 2;
gid = orgGID+delta;
break;
case 2:
/* format 2 */
glyphCount = getS16BE(pos,&parsedOk);
pos += 2;
if (glyphCount > coverageIndex) {
pos += coverageIndex*2;
substitute = getU16BE(pos,&parsedOk);
gid = substitute;
}
break;
default:
/* unknown format */
break;
}
}
return gid;
}
int FoFiTrueType::checkGIDInCoverage(unsigned int coverage, unsigned int orgGID)
{
int index = -1;
unsigned int format;
unsigned int count;
unsigned int i;
unsigned int pos;
pos = coverage;
format = getU16BE(pos,&parsedOk);
pos += 2;
switch (format) {
case 1:
count = getU16BE(pos,&parsedOk);
pos += 2;
// In some poor CJK fonts, key GIDs are not sorted,
// thus we cannot finish checking even when the range
// including orgGID seems to have already passed.
for (i = 0;i < count;i++) {
unsigned int gid;
gid = getU16BE(pos,&parsedOk);
pos += 2;
if (gid == orgGID) {
/* found */
index = i;
break;
}
}
break;
case 2:
count = getU16BE(pos,&parsedOk);
pos += 2;
for (i = 0;i < count;i++) {
unsigned int startGID, endGID;
unsigned int startIndex;
startGID = getU16BE(pos,&parsedOk);
pos += 2;
endGID = getU16BE(pos,&parsedOk);
pos += 2;
startIndex = getU16BE(pos,&parsedOk);
pos += 2;
// In some poor CJK fonts, key GIDs are not sorted,
// thus we cannot finish checking even when the range
// including orgGID seems to have already passed.
if (startGID <= orgGID && orgGID <= endGID) {
/* found */
index = startIndex+orgGID-startGID;
break;
}
}
break;
default:
break;
}
return index;
}