/src/xpdf-4.06/xpdf/GfxFont.cc

Source
//========================================================================
//
// GfxFont.cc
//
// Copyright 1996-2003 Glyph & Cog, LLC
//
//========================================================================

#include <aconf.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include <limits.h>
#include "gmem.h"
#include "gmempp.h"
#include "GList.h"
#include "GHash.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 "FoFiIdentifier.h"
#include "FoFiType1.h"
#include "FoFiType1C.h"
#include "FoFiTrueType.h"
#include "GfxFont.h"

//------------------------------------------------------------------------

struct Base14FontMapEntry {
  const char *altName;
  const char *base14Name;
};

static 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" },
  { "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 readFromStream(void *data) {
  return ((Stream *)data)->getChar();
}

//------------------------------------------------------------------------
// GfxFontLoc
//------------------------------------------------------------------------

GfxFontLoc::GfxFontLoc() {
  path = NULL;
  fontNum = 0;
  oblique = 0;
  encoding = NULL;
  substIdx = -1;
}

GfxFontLoc::~GfxFontLoc() {
  if (path) {
    delete path;
  }
  if (encoding) {
    delete encoding;
  }
}

//------------------------------------------------------------------------
// GfxFont
//------------------------------------------------------------------------

GfxFont *GfxFont::makeFont(XRef *xref, const char *tagA,
         Ref idA, Dict *fontDict) {
  GString *nameA;
  Ref embFontIDA;
  GfxFontType typeA;
  GfxFont *font;
  Object obj1;

  // get base font name
  nameA = NULL;
  fontDict->lookup("BaseFont", &obj1);
  if (obj1.isName()) {
    nameA = new GString(obj1.getName());
  } else if (obj1.isString()) {
    nameA = obj1.getString()->copy();
  }
  obj1.free();

  // get embedded font ID and font type
  typeA = getFontType(xref, fontDict, &embFontIDA);

  // create the font object
  font = NULL;
  if (typeA < fontCIDType0) {
    font = new Gfx8BitFont(xref, tagA, idA, nameA, typeA, embFontIDA,
         fontDict);
  } else {
    font = new GfxCIDFont(xref, tagA, idA, nameA, typeA, embFontIDA,
        fontDict);
  }

  return font;
}

GfxFont *GfxFont::makeDefaultFont(XRef *xref) {
  Object type, subtype, baseFont;
  type.initName("Font");
  subtype.initName("Type1");
  baseFont.initName("Helvetica");
  Object fontDict;
  fontDict.initDict(xref);
  fontDict.dictAdd(copyString("Type"), &type);
  fontDict.dictAdd(copyString("Subtype"), &subtype);
  fontDict.dictAdd(copyString("BaseFont"), &baseFont);

  Ref r;
  r.gen = 100000;
  r.num = GfxFontDict::hashFontObject(&fontDict);

  GfxFont *font = makeFont(xref, "undef", r, fontDict.getDict());
  fontDict.free();

  return font;
}

GfxFont::GfxFont(const char *tagA, Ref idA, GString *nameA,
     GfxFontType typeA, Ref embFontIDA) {
  ok = gFalse;
  tag = new GString(tagA);
  id = idA;
  name = nameA;
  type = typeA;
  embFontID = embFontIDA;
  embFontName = NULL;
  hasToUnicode = gFalse;
}

GfxFont::~GfxFont() {
  delete tag;
  if (name) {
    delete name;
  }
  if (embFontName) {
    delete embFontName;
  }
}

// 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;
  Object subtype, fontDesc, obj1, obj2, obj3, obj4;
  GBool isType0, err;

  t = fontUnknownType;
  embID->num = embID->gen = -1;
  err = gFalse;

  fontDict->lookup("Subtype", &subtype);
  expectedType = fontUnknownType;
  isType0 = gFalse;
  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 = gTrue;
  } else {
    error(errSyntaxWarning, -1, "Unknown font type: '{0:s}'",
    subtype.isName() ? subtype.getName() : "???");
  }
  subtype.free();

  fontDict2 = fontDict;
  if (fontDict->lookup("DescendantFonts", &obj1)->isArray()) {
    if (obj1.arrayGetLength() == 0) {
      error(errSyntaxWarning, -1, "Empty DescendantFonts array in font");
      obj2.initNull();
    } else if (obj1.arrayGet(0, &obj2)->isDict()) {
      if (!isType0) {
  error(errSyntaxWarning, -1, "Non-CID font with DescendantFonts array");
      }
      fontDict2 = obj2.getDict();
      fontDict2->lookup("Subtype", &subtype);
      if (subtype.isName("CIDFontType0")) {
  if (isType0) {
    expectedType = fontCIDType0;
  }
      } else if (subtype.isName("CIDFontType2")) {
  if (isType0) {
    expectedType = fontCIDType2;
  }
      }
      subtype.free();
    }
  } else {
    obj2.initNull();
  }

  // NB: the PDF spec doesn't say anything about precedence, but Adobe
  // uses FontFile3 over FontFile2 if both are present.
  if (fontDict2->lookup("FontDescriptor", &fontDesc)->isDict()) {
    if (fontDesc.dictLookupNF("FontFile3", &obj3)->isRef()) {
      *embID = obj3.getRef();
      if (obj3.fetch(xref, &obj4)->isStream()) {
  obj4.streamGetDict()->lookup("Subtype", &subtype);
  if (subtype.isName("Type1")) {
    if (expectedType != fontType1) {
      err = gTrue;
      expectedType = isType0 ? fontCIDType0 : fontType1;
    }
  } else if (subtype.isName("Type1C")) {
    if (expectedType == fontType1) {
      expectedType = fontType1C;
    } else if (expectedType != fontType1C) {
      err = gTrue;
      expectedType = isType0 ? fontCIDType0C : fontType1C;
    }
  } else if (subtype.isName("TrueType")) {
    if (expectedType != fontTrueType) {
      err = gTrue;
      expectedType = isType0 ? fontCIDType2 : fontTrueType;
    }
  } else if (subtype.isName("CIDFontType0C")) {
    if (expectedType == fontCIDType0) {
      expectedType = fontCIDType0C;
    } else {
      err = gTrue;
      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 = gTrue;
    }
  } else {
    error(errSyntaxError, -1, "Unknown font type '{0:s}'",
    subtype.isName() ? subtype.getName() : "???");
  }
  subtype.free();
      }
      obj4.free();
    }
    obj3.free();
    if (embID->num == -1) {
      if (fontDesc.dictLookupNF("FontFile2", &obj3)->isRef()) {
  *embID = obj3.getRef();
  if (isType0) {
    expectedType = fontCIDType2;
  } else if (expectedType != fontTrueType) {
    err = gTrue;
  }
      }
      obj3.free();
    }
    if (embID->num == -1) {
      if (fontDesc.dictLookupNF("FontFile", &obj3)->isRef()) {
  *embID = obj3.getRef();
  if (expectedType != fontType1) {
    err = gTrue;
  }
      }
      obj3.free();
    }
  }
  fontDesc.free();

  t = fontUnknownType;
  if (embID->num >= 0) {
    obj3.initRef(embID->num, embID->gen);
    obj3.fetch(xref, &obj4);
    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;
      }
    } else {
      error(errSyntaxError, -1, "Embedded font object is wrong type");
    }
    obj4.free();
    obj3.free();
  }

  // If the embedded font doesn't exist, or it's not a stream object,
  // or we couldn't identify its type, then remove the reference so
  // nothing tries to use it later.
  if (t == fontUnknownType) {
    embID->num = -1;
    embID->gen = -1;
    t = expectedType;
  }

  if (t != expectedType) {
    err = gTrue;
  }

  if (err) {
    error(errSyntaxWarning, -1,
    "Mismatch between font type and embedded font file");
  }

  obj2.free();
  obj1.free();

  return t;
}

void GfxFont::readFontDescriptor(XRef *xref, Dict *fontDict) {
  Object obj1, obj2, obj3, obj4;
  double t, t2;
  int i;

  // assume Times-Roman by default (for substitution purposes)
  flags = fontSerif;

  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 MissingWidth
    obj1.dictLookup("MissingWidth", &obj2);
    if (obj2.isNum()) {
      missingWidth = obj2.getNum();
    }
    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();

    // get Ascent (but also look at CapHeight)
    obj1.dictLookup("Ascent", &obj2);
    obj1.dictLookup("CapHeight", &obj3);
    if (obj2.isNum() || obj3.isNum()) {
      if (obj2.isNum()) {
  t = 0.001 * obj2.getNum();
  // some broken font descriptors specify a negative ascent
  if (t < 0) {
    t = -t;
  }
      } else {
  t = 0;
      }
      if (obj3.isNum()) {
  t2 = 0.001 * obj3.getNum();
  // some broken font descriptors specify a negative ascent
  if (t2 < 0) {
    t2 = -t2;
  }
      } else {
  t2 = 0;
      }
      if (t != 0 && t < 1.9) {
  declaredAscent = t;
      }
      // The ascent is generally expected to be in the (0.55, 1.9) range.
      // If Ascent and/or CapHeight is in that range, use the smaller one
      // (because the most common problem is that Ascent is too large).
      // Otherwise check for a value in (0, 0.55], and use that.
      if (t > 0.55 && t < 1.9) {
  if (t2 > 0.55 && t2 < 1.9) {
    ascent = (t < t2) ? t : t2;
  } else {
    ascent = t;
  }
      } else if (t2 > 0.55 && t2 < 1.9) {
  ascent = t2;
      } else if (fontBBox[3] > 0.55 && fontBBox[3] < 1.9 &&
     fontBBox[1] < fontBBox[3]) {
  ascent = fontBBox[3];
      } else if (t > 0 && t < 1.9) {
  ascent = t;
      } else if (t2 > 0 && t2 < 1.9) {
  ascent = t2;
      }
    }
    obj2.free();
    obj3.free();

    // get Descent
    obj1.dictLookup("Descent", &obj2);
    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 > -1.9) {
  descent = t;
      } else if (fontBBox[1] > -1.9 && fontBBox[1] <= 0 &&
     fontBBox[1] < fontBBox[3]) {
  descent = fontBBox[1];
      }
    }
    obj2.free();

  }
  obj1.free();

  // scan font name for bold/italic tags and update the flags
  if (name) {
    i = name->getLength();
    if (i > 2 && !strncmp(name->getCString() + i - 2, "MT", 2)) {
      i -= 2;
    }
    if (i > 6 && !strncmp(name->getCString() + i - 6, "Italic", 6)) {
      flags |= fontItalic;
      i -= 6;
    } else if (i > 2 && !strncmp(name->getCString() + i - 2, "It", 2)) {
      flags |= fontItalic;
      i -= 2;
    } else if (i > 7 && !strncmp(name->getCString() + i - 7, "Oblique", 7)) {
      flags |= fontItalic;
      i -= 7;
    }
    if (i > 0) {
      char c = name->getChar(i-1);
      if (!((c >= 'A' && c <= 'Z') ||
      (c >= 'a' && c <= 'z') ||
      (c >= '0' && c <= '9'))) {
  --i;
      }
    }
    if (i > 4 && !strncmp(name->getCString() + i - 4, "Bold", 4)) {
      flags |= fontBold;
    }
  }
}

CharCodeToUnicode *GfxFont::readToUnicodeCMap(Dict *fontDict, int nBits,
                CharCodeToUnicode *ctu) {
  GString *buf;
  Object obj1;
  char buf2[4096];
  int n;

  if (!fontDict->lookup("ToUnicode", &obj1)->isStream()) {
    obj1.free();
    return NULL;
  }
  buf = new GString();
  obj1.streamReset();
  while ((n = obj1.streamGetBlock(buf2, sizeof(buf2))) > 0) {
    buf->append(buf2, n);
  }
  obj1.streamClose();
  obj1.free();
  if (ctu) {
    ctu->mergeCMap(buf, nBits);
  } else {
    ctu = CharCodeToUnicode::parseCMap(buf, nBits);
  }
  delete buf;
  hasToUnicode = gTrue;
  return ctu;
}

GfxFontLoc *GfxFont::locateFont(XRef *xref, GBool ps) {
  GfxFontLoc *fontLoc;
  SysFontType sysFontType;
  FoFiIdentifierType fft;
  GString *path, *base14Name, *substName;
  PSFontParam16 *psFont16;
  Object refObj, embFontObj;
  int substIdx, fontNum;
  double oblique;
  GBool embed;

  if (type == fontType3) {
    return NULL;
  }

  //----- embedded font
  if (embFontID.num >= 0) {
    embed = gTrue;
    refObj.initRef(embFontID.num, embFontID.gen);
    refObj.fetch(xref, &embFontObj);
    if (!embFontObj.isStream()) {
      error(errSyntaxError, -1, "Embedded font object is wrong type");
      embed = gFalse;
    }
    embFontObj.free();
    refObj.free();
    if (embed) {
      if (ps) {
  switch (type) {
  case fontType1:
  case fontType1C:
  case fontType1COT:
    embed = globalParams->getPSEmbedType1();
    break;
  case fontTrueType:
  case fontTrueTypeOT:
    embed = globalParams->getPSEmbedTrueType();
    break;
  case fontCIDType0C:
  case fontCIDType0COT:
    embed = globalParams->getPSEmbedCIDPostScript();
    break;
  case fontCIDType2:
  case fontCIDType2OT:
    embed = globalParams->getPSEmbedCIDTrueType();
    break;
  default:
    break;
  }
      }
      if (embed) {
  fontLoc = new GfxFontLoc();
  fontLoc->locType = gfxFontLocEmbedded;
  fontLoc->fontType = type;
  fontLoc->embFontID = embFontID;
  return fontLoc;
      }
    }
  }

  //----- PS passthrough
  if (ps && name && !isCIDFont() && globalParams->getPSFontPassthrough()) {
    fontLoc = new GfxFontLoc();
    fontLoc->locType = gfxFontLocResident;
    fontLoc->fontType = fontType1;
    fontLoc->path = name->copy();
    return fontLoc;
  }

  //----- external font file (fontFile, fontDir)
  if (name && (path = globalParams->findFontFile(name))) {
    if ((fontLoc = getExternalFont(path, 0, 0, isCIDFont()))) {
      return fontLoc;
    }
  }

  //----- PS resident Base-14 font
  if (ps && !isCIDFont() && ((Gfx8BitFont *)this)->base14) {
    fontLoc = new GfxFontLoc();
    fontLoc->locType = gfxFontLocResident;
    fontLoc->fontType = fontType1;
    fontLoc->path = new GString(((Gfx8BitFont *)this)->base14->base14Name);
    return fontLoc;
  }

  //----- external font file for Base-14 font
  if (!ps && !isCIDFont() && ((Gfx8BitFont *)this)->base14) {
    base14Name = new GString(((Gfx8BitFont *)this)->base14->base14Name);
    path = globalParams->findBase14FontFile(base14Name, &fontNum, &oblique);
    delete base14Name;
    if (path && (fontLoc = getExternalFont(path, fontNum, oblique, gFalse))) {
      return fontLoc;
    }
  }

  //----- system font
  if (name && (path = globalParams->findSystemFontFile(name, &sysFontType,
                   &fontNum))) {
    fontLoc = new GfxFontLoc();
    fontLoc->locType = gfxFontLocExternal;
    fontLoc->path = path;
    fontLoc->fontNum = fontNum;
    fft = FoFiIdentifier::identifyFile(fontLoc->path->getCString());
    switch (fft) {
    case fofiIdType1PFA:
    case fofiIdType1PFB:
      fontLoc->fontType = fontType1;
      break;
    case fofiIdCFF8Bit:
      fontLoc->fontType = fontType1C;
      break;
    case fofiIdCFFCID:
      fontLoc->fontType = fontCIDType0C;
      break;
    case fofiIdTrueType:
    case fofiIdTrueTypeCollection:
      fontLoc->fontType = isCIDFont() ? fontCIDType2 : fontTrueType;
      break;
    case fofiIdOpenTypeCFF8Bit:
      fontLoc->fontType = fontType1COT;
      break;
    case fofiIdOpenTypeCFFCID:
      fontLoc->fontType = fontCIDType0COT;
      break;
    case fofiIdDfont:
      fontLoc->fontType = isCIDFont() ? fontCIDType2 : fontTrueType;
      break;
    case fofiIdUnknown:
    case fofiIdError:
    default:
      delete fontLoc;
      fontLoc = NULL;
      break;
    }
    if (fontLoc) {
      return fontLoc;
    }
  }

  if (!isCIDFont()) {

    //----- 8-bit PS resident font
    if (ps) {
      if (name && (path = globalParams->getPSResidentFont(name))) {
  fontLoc = new GfxFontLoc();
  fontLoc->locType = gfxFontLocResident;
  fontLoc->fontType = fontType1;
  fontLoc->path = path;
  return fontLoc;
      }
    }

    //----- 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;
    }
    substName = new GString(base14SubstFonts[substIdx]);
    if (ps) {
      error(errSyntaxWarning, -1, "Substituting font '{0:s}' for '{1:t}'",
      base14SubstFonts[substIdx], name);
      fontLoc = new GfxFontLoc();
      fontLoc->locType = gfxFontLocResident;
      fontLoc->fontType = fontType1;
      fontLoc->path = substName;
      fontLoc->substIdx = substIdx;
      return fontLoc;
    } else {
      path = globalParams->findBase14FontFile(substName, &fontNum, &oblique);
      delete substName;
      if (path) {
  if ((fontLoc = getExternalFont(path, fontNum, oblique, gFalse))) {
    error(errSyntaxWarning, -1, "Substituting font '{0:s}' for '{1:t}'",
    base14SubstFonts[substIdx], name);
    fontLoc->substIdx = substIdx;
    return fontLoc;
  }
      }
    }

    // failed to find a substitute font
    return NULL;
  }

  //----- 16-bit PS resident font
  if (ps && name && ((psFont16 = globalParams->getPSResidentFont16(
           name,
           ((GfxCIDFont *)this)->getWMode())))) {
    fontLoc = new GfxFontLoc();
    fontLoc->locType = gfxFontLocResident;
    fontLoc->fontType = fontCIDType0; // this is not used
    fontLoc->path = psFont16->psFontName->copy();
    fontLoc->encoding = psFont16->encoding->copy();
    fontLoc->wMode = psFont16->wMode;
    return fontLoc;
  }
  if (ps && ((psFont16 = globalParams->getPSResidentFontCC(
         ((GfxCIDFont *)this)->getCollection(),
         ((GfxCIDFont *)this)->getWMode())))) {
    error(errSyntaxWarning, -1, "Substituting font '{0:t}' for '{1:t}'",
    psFont16->psFontName, name);
    fontLoc = new GfxFontLoc();
    fontLoc->locType = gfxFontLocResident;
    fontLoc->fontType = fontCIDType0; // this is not used
    fontLoc->path = psFont16->psFontName->copy();
    fontLoc->encoding = psFont16->encoding->copy();
    fontLoc->wMode = psFont16->wMode;
    return fontLoc;
  }

  //----- CID font substitution
  if ((path = globalParams->findCCFontFile(
        ((GfxCIDFont *)this)->getCollection()))) {
    if ((fontLoc = getExternalFont(path, 0, 0, gTrue))) {
      error(errSyntaxWarning, -1, "Substituting font '{0:t}' for '{1:t}'",
      fontLoc->path, name);
      return fontLoc;
    }
  }

  // failed to find a substitute font
  return NULL;
}

GfxFontLoc *GfxFont::locateBase14Font(GString *base14Name) {
  GString *path;
  int fontNum;
  double oblique;

  path = globalParams->findBase14FontFile(base14Name, &fontNum, &oblique);
  if (!path) {
    return NULL;
  }
  return getExternalFont(path, fontNum, oblique, gFalse);
}

GfxFontLoc *GfxFont::getExternalFont(GString *path, int fontNum,
             double oblique, GBool cid) {
  FoFiIdentifierType fft;
  GfxFontType fontType;
  GfxFontLoc *fontLoc;

  fft = FoFiIdentifier::identifyFile(path->getCString());
  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 fofiIdDfont:
    fontType = cid ? fontCIDType2 : fontTrueType;
    break;
  case fofiIdUnknown:
  case fofiIdError:
  default:
    fontType = fontUnknownType;
    break;
  }
  if (fontType == fontUnknownType ||
      (cid ? (fontType < fontCIDType0)
           : (fontType >= fontCIDType0))) {
    delete path;
    return NULL;
  }
  fontLoc = new GfxFontLoc();
  fontLoc->locType = gfxFontLocExternal;
  fontLoc->fontType = fontType;
  fontLoc->path = path;
  fontLoc->fontNum = fontNum;
  fontLoc->oblique = oblique;
  return fontLoc;
}

char *GfxFont::readEmbFontFile(XRef *xref, int *len) {
  char *buf;
  Object obj1, obj2;
  Stream *str;
  int size, n;

  obj1.initRef(embFontID.num, embFontID.gen);
  obj1.fetch(xref, &obj2);
  if (!obj2.isStream()) {
    error(errSyntaxError, -1, "Embedded font file is not a stream");
    obj2.free();
    obj1.free();
    embFontID.num = -1;
    return NULL;
  }
  str = obj2.getStream();

  size = 4096;
  buf = (char *)gmalloc(size);
  *len = 0;
  str->reset();
  do {
    if (*len > size - 4096) {
      if (size > INT_MAX / 2) {
  error(errSyntaxError, -1, "Embedded font file is too large");
  break;
      }
      size *= 2;
      buf = (char *)grealloc(buf, size);
    }
    n = str->getBlock(buf + *len, 4096);
    *len += n;
  } while (n == 4096);
  str->close();

  obj2.free();
  obj1.free();

  return buf;
}

//------------------------------------------------------------------------
// Gfx8BitFont
//------------------------------------------------------------------------

Gfx8BitFont::Gfx8BitFont(XRef *xref, const char *tagA, Ref idA, GString *nameA,
       GfxFontType typeA, Ref embFontIDA, Dict *fontDict):
  GfxFont(tagA, idA, nameA, typeA, embFontIDA)
{
  GString *name2;
  BuiltinFont *builtinFont;
  const char **baseEnc;
  char *buf;
  int len;
  FoFiType1 *ffT1;
  FoFiType1C *ffT1C;
  int code, code2;
  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;

  ctu = NULL;

  // do font name substitution for various aliases of the Base 14 font
  // names
  base14 = NULL;
  if (name) {
    name2 = name->copy();
    i = 0;
    while (i < name2->getLength()) {
      if (name2->getChar(i) == ' ') {
  name2->del(i);
      } 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->cmp(base14FontMap[m].altName) >= 0) {
  a = m;
      } else {
  b = m;
      }
    }
    if (!name2->cmp(base14FontMap[a].altName)) {
      base14 = &base14FontMap[a];
    }
    delete name2;
  }

  // is it a built-in font?
  builtinFont = NULL;
  if (base14) {
    for (i = 0; i < nBuiltinFonts; ++i) {
      if (!strcmp(base14->base14Name, builtinFonts[i].name)) {
  builtinFont = &builtinFonts[i];
  break;
      }
    }
  }

  // default ascent/descent values
  if (builtinFont) {
    missingWidth = builtinFont->missingWidth;
    ascent = 0.001 * builtinFont->ascent;
    descent = 0.001 * builtinFont->descent;
    declaredAscent = ascent;
    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 {
    missingWidth = 0;
    ascent = 0.75;
    descent = -0.25;
    declaredAscent = ascent;
    fontBBox[0] = fontBBox[1] = fontBBox[2] = fontBBox[3] = 0;
  }

  // get info from font descriptor
  readFontDescriptor(xref, fontDict);

  // for Base-14 fonts (even if embedded), don't trust the
  // ascent/descent/bbox values from the font descriptor
  if (builtinFont) {
    ascent = 0.001 * builtinFont->ascent;
    descent = 0.001 * builtinFont->descent;
    declaredAscent = ascent;
    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];
  }

  // 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(errSyntaxError, -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 --> WinAnsiEncoding
  //        - 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;
    }
    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;
  }

  // a non-embedded Symbol or ZapfDingbats font should never use one
  // of the non-symbol encodings -- I've encountered PDF files that
  // set the Encoding to WinAnsiEncoding, which doesn't make any sense
  // (and other viewers also seem to ignore it)
  if (builtinFont && embFontID.num < 0 &&
      (builtinFont->defaultBaseEnc == symbolEncoding ||
       builtinFont->defaultBaseEnc == zapfDingbatsEncoding) &&
      !obj1.isDict()) {
    baseEnc = NULL;
  }

  // check embedded 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 && embFontID.num >= 0) {
    if ((buf = readEmbFontFile(xref, &len))) {
      if ((ffT1 = FoFiType1::make(buf, len))) {
  if (ffT1->getName()) {
    if (embFontName) {
      delete embFontName;
    }
    embFontName = new GString(ffT1->getName());
  }
  if (!baseEnc) {
    baseEnc = (const char **)ffT1->getEncoding();
    baseEncFromFontFile = gTrue;
  }
      }
      gfree(buf);
    }
  } else if (type == fontType1C && embFontID.num >= 0) {
    if ((buf = readEmbFontFile(xref, &len))) {
      if ((ffT1C = FoFiType1C::make(buf, len))) {
  if (ffT1C->getName()) {
    if (embFontName) {
      delete embFontName;
    }
    embFontName = new GString(ffT1C->getName());
  }
  if (!baseEnc) {
    baseEnc = (const char **)ffT1C->getEncoding();
    baseEncFromFontFile = gTrue;
  }
      }
      gfree(buf);
    }
  }

  // get default base encoding
  if (!baseEnc) {
    if (builtinFont && embFontID.num < 0) {
      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] = (char *)baseEnc[i];
    if ((encFree[i] = (char)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 && embFontID.num >= 0 && baseEncFromFontFile) {
    for (i = 0; i < 256; ++i) {
      if (!enc[i] && standardEncoding[i]) {
  enc[i] = (char *)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(enc[code]);
      }
      enc[code] = copyString(obj3.getName());
      encFree[code] = gTrue;
    }
    ++code;
  } else {
    error(errSyntaxError, -1,
    "Wrong type in font encoding resource differences ({0: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] & 0xff) &&
       isxdigit(charName[1] & 0xff) && isxdigit(charName[2] & 0xff) &&
       ((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] & 0xff) && isxdigit(charName[1] & 0xff) &&
       ((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
  // any of the following forms:
  // - 'xx'
  // - 'Axx'
  // - 'nn'
  // - 'Ann'
  // - 'ABnn'
  // - 'unixxxx' (possibly followed by garbage - some Arabic files
  //             use 'uni0628.medi', etc.)
  // where 'A' and 'B' are any letters, 'xx' is two hex digits, 'xxxx'
  // is four hex digits, and 'nn' is 2-4 decimal digits
  usedNumericHeuristic = gFalse;
  if (missing && globalParams->getMapNumericCharNames()) {
    for (code = 0; code < 256; ++code) {
      if ((charName = enc[code]) && !toUnicode[code] &&
    strcmp(charName, ".notdef")) {
  n = (int)strlen(charName);
  code2 = -1;
  if (hex && n == 3 && isalpha(charName[0] & 0xff) &&
      isxdigit(charName[1] & 0xff) && isxdigit(charName[2] & 0xff)) {
    sscanf(charName+1, "%x", &code2);
  } else if (hex && n == 2 &&
       isxdigit(charName[0] & 0xff) &&
       isxdigit(charName[1] & 0xff)) {
    sscanf(charName, "%x", &code2);
  } else if (!hex && n >= 2 && n <= 4 &&
       isdigit(charName[0] & 0xff) && isdigit(charName[1] & 0xff)) {
    code2 = atoi(charName);
  } else if (n >= 3 && n <= 5 &&
       isdigit(charName[1] & 0xff) && isdigit(charName[2] & 0xff)) {
    code2 = atoi(charName+1);
  } else if (n >= 4 && n <= 6 &&
       isdigit(charName[2] & 0xff) && isdigit(charName[3] & 0xff)) {
    code2 = atoi(charName+2);
  } else if (n >= 7 && charName[0] == 'u' && charName[1] == 'n' &&
       charName[2] == 'i' &&
       isxdigit(charName[3] & 0xff) &&
       isxdigit(charName[4] & 0xff) &&
       isxdigit(charName[5] & 0xff) &&
       isxdigit(charName[6] & 0xff)) {
    sscanf(charName + 3, "%x", &code2);
  }
  if (code2 >= 0 && code2 <= 0xffff) {
    toUnicode[code] = (Unicode)code2;
    usedNumericHeuristic = gTrue;
  }
      }
    }

  // if the 'mapUnknownCharNames' flag is set, do a simple pass-through
  // mapping for unknown character names
  } else if (missing && globalParams->getMapUnknownCharNames()) {
    for (code = 0; code < 256; ++code) {
      if (!toUnicode[code]) {
  toUnicode[code] = code;
      }
    }
  }

  // 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 (fabs(widths[code] - widths[firstChar]) > 0.00001) {
    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(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;
}

int *Gfx8BitFont::getCodeToGIDMap(FoFiTrueType *ff) {
  int *map;
  int cmapPlatform, cmapEncoding;
  int unicodeCmap, macRomanCmap, macUnicodeCmap, msSymbolCmap, cmap;
  GBool nonsymbolic, useMacRoman, useUnicode;
  char *charName;
  Unicode u;
  int code, i, n;

  map = (int *)gmallocn(256, sizeof(int));
  for (i = 0; i < 256; ++i) {
    map[i] = 0;
  }

  // This is based on the cmap/encoding selection algorithm in the PDF
  // 2.0 spec, but with some differences to match up with Adobe's
  // behavior.
  unicodeCmap = macRomanCmap = macUnicodeCmap = msSymbolCmap = -1;
  for (i = 0; i < ff->getNumCmaps(); ++i) {
    cmapPlatform = ff->getCmapPlatform(i);
    cmapEncoding = ff->getCmapEncoding(i);
    if (cmapPlatform == 3 && cmapEncoding == 1) {
      unicodeCmap = i;
    } else if (cmapPlatform == 1 && cmapEncoding == 0) {
      macRomanCmap = i;
    } else if (cmapPlatform == 0 && cmapEncoding <= 4) {
      macUnicodeCmap = i;
    } else if (cmapPlatform == 3 && cmapEncoding == 0) {
      msSymbolCmap = i;
    }
  }
  useMacRoman = gFalse;
  useUnicode = gFalse;
  nonsymbolic = !(flags & fontSymbolic);
  if (embFontID.num < 0 && hasEncoding && unicodeCmap >= 0) { 
    cmap = unicodeCmap;
    useUnicode = gTrue;
  } else if (!nonsymbolic && msSymbolCmap >= 0) {
    cmap = msSymbolCmap;
  } else if (unicodeCmap >= 0) {
    cmap = unicodeCmap;
    useUnicode = nonsymbolic;
  } else if (usesMacRomanEnc && macRomanCmap >= 0) {
    // MacRoman cmap has higher precedence than Mac Unicode only if
    // the font uses the MacRoman encoding
    cmap = macRomanCmap;
    useMacRoman = gTrue;
  } else if (macUnicodeCmap >= 0) {
    cmap = macUnicodeCmap;
    useUnicode = nonsymbolic;
  } else if (macRomanCmap >= 0) {
    cmap = macRomanCmap;
    useMacRoman = nonsymbolic;
  } else {
    cmap = 0;
  }

  // reverse map the char names through MacRomanEncoding, then map the
  // char codes through the cmap; fall back on Unicode if that doesn't
  // work
  if (useMacRoman) {
    for (i = 0; i < 256; ++i) {
      if ((charName = enc[i])) {
  if ((code = globalParams->getMacRomanCharCode(charName))) {
    map[i] = ff->mapCodeToGID(cmap, code);
  } else if (unicodeCmap >= 0 &&
       (u = globalParams->mapNameToUnicode(charName))) {
    map[i] = ff->mapCodeToGID(unicodeCmap, u);
  }
      } else if (unicodeCmap >= 0 &&
     (n = ctu->mapToUnicode((CharCode)i, &u, 1))) {
  map[i] = ff->mapCodeToGID(cmap, u);
      } else {
  map[i] = -1;
      }
    }

  // map Unicode through the cmap
  } else if (useUnicode) {
    for (i = 0; i < 256; ++i) {
      if (((charName = enc[i]) &&
     (u = globalParams->mapNameToUnicode(charName))) ||
    (n = ctu->mapToUnicode((CharCode)i, &u, 1))) {
  map[i] = ff->mapCodeToGID(cmap, u);
      } else {
  map[i] = -1;
      }
    }

  // 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] <= 0 && (charName = enc[i])) {
      map[i] = ff->mapNameToGID(charName);
    }
  }

  return map;
}

int *Gfx8BitFont::getCodeToGIDMap(FoFiType1C *ff) {
  int *map;
  GHash *nameToGID;
  int i, gid;

  map = (int *)gmallocn(256, sizeof(int));
  for (i = 0; i < 256; ++i) {
    map[i] = 0;
  }

  nameToGID = ff->getNameToGIDMap();
  for (i = 0; i < 256; ++i) {
    if (!enc[i]) {
      continue;
    }
    gid = nameToGID->lookupInt(enc[i]);
    if (gid < 0 || gid >= 65536) {
      continue;
    }
    map[i] = gid;
  }

  delete nameToGID;

  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;
}

Object *Gfx8BitFont::getCharProcNF(int code, Object *proc) {
  if (enc[code] && charProcs.isDict()) {
    charProcs.dictLookupNF(enc[code], proc);
  } else {
    proc->initNull();
  }
  return proc;
}

Dict *Gfx8BitFont::getResources() {
  return resources.isDict() ? resources.getDict() : (Dict *)NULL;
}

GBool Gfx8BitFont::problematicForUnicode() {
  GString *nameLC;
  GBool symbolic;

  // potential inputs:
  // - font is embedded (GfxFont.embFontID.num >= 0)
  // - font name (GfxFont.name)
  // - font type (GfxFont.type)
  // - Base-14 font (Gfx8BitFont.base14 != NULL)
  // - symbolic (GfxFont.flags & fontSymbolic)
  // - has Encoding array (Gfx8BitFont.hasEncoding)
  // - extracted base encoding from embedded font file
  //   (Gfx8BitFont.baseEncFromFontFile)
  // - has a ToUnicode map (GfxFont.hasToUnicode)
  // - used the numeric glyph name heuristic
  //   (Gfx8BitFont.usedNumericHeuristic)

  if (name) {
    nameLC = name->copy();
    nameLC->lowerCase();
    symbolic = strstr(nameLC->getCString(), "dingbat") ||
               strstr(nameLC->getCString(), "wingding") ||
               strstr(nameLC->getCString(), "commpi");
    delete nameLC;
    if (symbolic) {
      return gFalse;
    }
  }

  if (embFontID.num >= 0) {
    switch (type) {
    case fontType1:
    case fontType1C:
    case fontType1COT:
      return !hasToUnicode && (!hasEncoding || usedNumericHeuristic);

    case fontType3:
      // this never happens -- Type 3 fonts don't set embFontID
      return !hasToUnicode && (!hasEncoding || usedNumericHeuristic);

    case fontTrueType:
    case fontTrueTypeOT:
      return !hasToUnicode && !hasEncoding;

    default:
      return !hasToUnicode;
    }

  } else if (type == fontType3) {
    return !hasToUnicode && (!hasEncoding || usedNumericHeuristic);

  } else {
    // NB: type will be fontTypeUnknown if the PDF specifies an
    // invalid font type -- which is ok, if we have a ToUnicode map or
    // an encoding
    return !hasToUnicode && !hasEncoding;
  }
}

GBool Gfx8BitFont::parensAreSwapped(XRef *xref) {
  return gFalse;
}

//------------------------------------------------------------------------
// GfxCIDFont
//------------------------------------------------------------------------

GfxCIDFont::GfxCIDFont(XRef *xref, const char *tagA, Ref idA, GString *nameA,
           GfxFontType typeA, Ref embFontIDA, Dict *fontDict):
  GfxFont(tagA, idA, nameA, typeA, embFontIDA)
{
  Dict *desFontDict;
  Object desFontDictObj;
  Object obj1, obj2, obj3, obj4, obj5, obj6;
  CharCodeToUnicode *utu;
  CharCode c;
  Unicode uBuf[8];
  int c1, c2;
  int excepsSize, i, j, k, n;

  missingWidth = 0;
  ascent = 0.95;
  descent = -0.35;
  declaredAscent = ascent;
  fontBBox[0] = fontBBox[1] = fontBBox[2] = fontBBox[3] = 0;
  collection = NULL;
  cMap = NULL;
  ctu = NULL;
  ctuUsesCharCode = gTrue;
  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() ||
      obj1.arrayGetLength() == 0) {
    error(errSyntaxError, -1,
    "Missing or empty DescendantFonts entry in Type 0 font");
    obj1.free();
    goto err1;
  }
  if (!obj1.arrayGet(0, &desFontDictObj)->isDict()) {
    error(errSyntaxError, -1, "Bad descendant font in Type 0 font");
    goto err2;
  }
  obj1.free();
  desFontDict = desFontDictObj.getDict();

  // get info from font descriptor
  readFontDescriptor(xref, desFontDict);

  //----- encoding info -----

  // char collection
  if (!desFontDict->lookup("CIDSystemInfo", &obj1)->isDict()) {
    error(errSyntaxError, -1,
    "Missing CIDSystemInfo dictionary in Type 0 descendant font");
    goto err2;
  }
  obj1.dictLookup("Registry", &obj2);
  obj1.dictLookup("Ordering", &obj3);
  if (!obj2.isString() || !obj3.isString()) {
    error(errSyntaxError, -1,
    "Invalid CIDSystemInfo dictionary in Type 0 descendant font");
    goto err3;
  }
  collection = obj2.getString()->copy()->append('-')->append(obj3.getString());
  obj3.free();
  obj2.free();
  obj1.free();

  // encoding (i.e., CMap)
  if (fontDict->lookup("Encoding", &obj1)->isNull()) {
    error(errSyntaxError, -1, "Missing Encoding entry in Type 0 font");
    goto err2;
  }
  if (!(cMap = CMap::parse(NULL, collection, &obj1))) {
    goto err2;
  }

  // check for fonts that use the Identity-H encoding (cmap), and the
  // Adobe-Identity character collection
  identityEnc = obj1.isName("Identity-H") &&
                !collection->cmp("Adobe-Identity");

  obj1.free();

  // CIDToGIDMap
  // (the PDF 1.7 spec only allows these for TrueType fonts, but
  // Acrobat apparently also allows them for OpenType CFF fonts -- and
  // the PDF 2.0 spec has removed the prohibition)
  hasIdentityCIDToGID = gFalse;
  desFontDict->lookup("CIDToGIDMap", &obj1);
  if (obj1.isStream()) {
    cidToGIDLen = 0;
    i = 64;
    cidToGID = (int *)gmallocn(i, sizeof(int));
    obj1.streamReset();
    while ((c1 = obj1.streamGetChar()) != EOF &&
     (c2 = obj1.streamGetChar()) != EOF) {
      if (cidToGIDLen == i) {
  i *= 2;
  cidToGID = (int *)greallocn(cidToGID, i, sizeof(int));
      }
      cidToGID[cidToGIDLen++] = (c1 << 8) + c2;
    }
    obj1.streamClose();
    identityEnc = gFalse;
  } else if (obj1.isName("Identity")) {
    hasIdentityCIDToGID = gTrue;
  } else if (!obj1.isNull()) {
    error(errSyntaxError, -1, "Invalid CIDToGIDMap entry in CID font");
  }
  obj1.free();

  // look for a ToUnicode CMap
  hasKnownCollection = gFalse;
  if (globalParams->getUseTrueTypeUnicodeMapping()) {
    readTrueTypeUnicodeMapping(xref);
  }
  if (!ctu) {
    ctu = readToUnicodeCMap(fontDict, 16, NULL);
  }
  if (!ctu) {
    ctuUsesCharCode = gFalse;

    // use an identity mapping for the "Adobe-Identity" and
    // "Adobe-UCS" collections
    if (!collection->cmp("Adobe-Identity") ||
  !collection->cmp("Adobe-UCS")) {
      ctu = CharCodeToUnicode::makeIdentityMapping();

    // look for a user-supplied .cidToUnicode file
    } else if ((ctu = globalParams->getCIDToUnicode(collection))) {
      hasKnownCollection = gTrue;

    } else {
      error(errSyntaxError, -1,
      "Unknown character collection '{0:t}'", collection);

      // fall back to an identity mapping
      ctu = CharCodeToUnicode::makeIdentityMapping();
    }
  }

  // look for a Unicode-to-Unicode mapping
  if (name && (utu = globalParams->getUnicodeToUnicode(name))) {
    if (ctu) {
      if (ctu->isIdentity()) {
  ctu->decRefCnt();
  ctu = utu;
      } else {
  for (c = 0; c < ctu->getLength(); ++c) {
    n = ctu->mapToUnicode(c, uBuf, 8);
    if (n >= 1) {
      n = utu->mapToUnicode((CharCode)uBuf[0], uBuf, 8);
      if (n >= 1) {
        ctu->setMapping(c, uBuf, n);
      }
    }
  }
  utu->decRefCnt();
      }
    } else {
      ctu = utu;
    }
  }

  //----- character metrics -----

  // default char width
  if (desFontDict->lookup("DW", &obj1)->isNum()) {
    widths.defWidth = obj1.getNum() * 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 *)
        greallocn(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(errSyntaxError, -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 *)
      greallocn(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(errSyntaxError, -1, "Bad widths array in Type 0 font");
    }
    obj4.free();
  }
  i += 2;
      } else {
  error(errSyntaxError, -1, "Bad widths array in Type 0 font");
  ++i;
      }
      obj3.free();
      obj2.free();
    }
  }
  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 *)
        greallocn(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(errSyntaxError, -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 *)
      greallocn(widths.excepsV,
          excepsSize, sizeof(GfxFontCIDWidthExcepV));
  }
  j = obj2.getInt();
  for (k = 0; k + 2 < 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.nExcepsV].first = j;
      widths.excepsV[widths.nExcepsV].last = j;
      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;
      ++j;
      ++widths.nExcepsV;
    } else {
      error(errSyntaxError, -1, "Bad widths (W2) array in Type 0 font");
    }
    obj6.free();
    obj5.free();
    obj4.free();
  }
  i += 2;
      } else {
  error(errSyntaxError, -1, "Bad widths (W2) array in Type 0 font");
  ++i;
      }
      obj3.free();
      obj2.free();
    }
  }
  obj1.free();

  desFontDictObj.free();
  ok = gTrue;
  return;

 err3:
  obj3.free();
  obj2.free();
 err2:
  obj1.free();
  desFontDictObj.free();
 err1:
  error(errSyntaxError, -1, "Failed to parse font object for '{0:t}'", name);
}

GfxCIDFont::~GfxCIDFont() {
  if (collection) {
    delete collection;
  }
  if (cMap) {
    cMap->decRefCnt();
  }
  if (ctu) {
    ctu->decRefCnt();
  }
  gfree(widths.exceps);
  gfree(widths.excepsV);
  if (cidToGID) {
    gfree(cidToGID);
  }
}

// Construct a code-to-Unicode mapping, based on the TrueType Unicode
// cmap (if present).  Constructs ctu if succesful; leaves ctu = null
// otherwise.  Always leaves ctu = null for non-TrueType fonts.
void GfxCIDFont::readTrueTypeUnicodeMapping(XRef *xref) {
  char *buf;
  FoFiTrueType *ff;
  Unicode *gidToUnicode, *codeToUnicode;
  Unicode u;
  int bufLen, cmapPlatform, cmapEncoding, unicodeCmap;
  int nGlyphs, nMappings, gid, i;

  // must be an embedded TrueType font, with an unknown char collection
  if ((type != fontCIDType2 && type != fontCIDType2OT) ||
      embFontID.num < 0 ||
      hasKnownCollection) {
    goto err0;
  }

  // read the embedded font and construct a FoFiTrueType
  if (!(buf = readEmbFontFile(xref, &bufLen))) {
    goto err0;
  }
  if (!(ff = FoFiTrueType::make(buf, bufLen, 0))) {
    goto err1;
  }

  // find the TrueType Unicode cmap
  unicodeCmap = -1;
  for (i = 0; i < ff->getNumCmaps(); ++i) {
    cmapPlatform = ff->getCmapPlatform(i);
    cmapEncoding = ff->getCmapEncoding(i);
    if ((cmapPlatform == 3 && cmapEncoding == 1) ||
  (cmapPlatform == 0 && cmapEncoding <= 4)) {
      unicodeCmap = i;
      break;
    }
  }
  if (unicodeCmap < 0) {
    goto err2;
  }

  // construct reverse GID-to-Unicode map
  nGlyphs = ff->getNumGlyphs();
  gidToUnicode = (Unicode *)gmallocn(nGlyphs, sizeof(Unicode));
  memset(gidToUnicode, 0, nGlyphs * sizeof(Unicode));
  nMappings = 0;
  for (u = 1; u <= 0xffff; ++u) {
    gid = ff->mapCodeToGID(unicodeCmap, (int)u);
    if (gid > 0 && gid < nGlyphs) {
      gidToUnicode[gid] = u;
      ++nMappings;
    }
  }
  // bail out if the Unicode cmap was completely empty
  if (nMappings == 0) {
    goto err3;
  }

  // construct code-to-Unicode map
  codeToUnicode = (Unicode *)gmallocn(65536, sizeof(Unicode));
  memset(codeToUnicode, 0, 65536 * sizeof(Unicode));
  for (i = 0; i <= 0xffff; ++i) {
    // we've already checked for an identity encoding, so CID = i
    if (cidToGID && i < cidToGIDLen) {
      gid = cidToGID[i];
    } else {
      gid = i;
    }
    if (gid < nGlyphs && gidToUnicode[gid] > 0) {
      codeToUnicode[i] = gidToUnicode[gid];
    }
  }
  ctu = CharCodeToUnicode::make16BitToUnicode(codeToUnicode);

  gfree(codeToUnicode);
 err3:
  gfree(gidToUnicode);
 err2:
  delete ff;
 err1:
  gfree(buf);
 err0:
  return;
}

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;
  CharCode c;
  int n;

  if (!cMap) {
    *code = 0;
    *uLen = 0;
    *dx = *dy = 0;
    return 1;
  }

  *code = (CharCode)(cid = cMap->getCID(s, len, &c, &n));
  if (ctu) {
    *uLen = ctu->mapToUnicode(ctuUsesCharCode ? c : cid, u, uSize);
  } else {
    *uLen = 0;
  }
  if (!*uLen && uSize >= 1 && globalParams->getMapUnknownCharNames()) {
    u[0] = *code;
    *uLen = 1;
  }

  // horizontal
  if (cMap->getWMode() == 0) {
    getHorizontalMetrics(cid, dx);
    *dy = *ox = *oy = 0;

  // vertical
  } else {
    getVerticalMetrics(cid, dy, ox, oy);
    *dx = 0;
  }

  return n;
}

// NB: Section 9.7.4.3 in the PDF 2.0 spec says that, in the case of
// duplicate entries in the metrics, the first entry should be used.
// This means we need to leave the metrics in the original order and
// perform a linear search.  (Or use a more complex data structure.)
void GfxCIDFont::getHorizontalMetrics(CID cid, double *w) {
  int i;
  for (i = 0; i < widths.nExceps; ++i) {
    if (widths.exceps[i].first <= cid && cid <= widths.exceps[i].last) {
      *w = widths.exceps[i].width;
      return;
    }
  }
  *w = widths.defWidth;
}

// NB: Section 9.7.4.3 in the PDF 2.0 spec says that, in the case of
// duplicate entries in the metrics, the first entry should be used.
// This means we need to leave the metrics in the original order and
// perform a linear search.  (Or use a more complex data structure.)
void GfxCIDFont::getVerticalMetrics(CID cid, double *h,
            double *vx, double *vy) {
  int i;
  for (i = 0; i < widths.nExcepsV; ++i) {
    if (widths.excepsV[i].first <= cid && cid <= widths.excepsV[i].last) {
      *h = widths.excepsV[i].height;
      *vx = widths.excepsV[i].vx;
      *vy = widths.excepsV[i].vy;
      return;
    }
  }
  *h = widths.defHeight;
  getHorizontalMetrics(cid, vx);
  *vx /= 2;
  *vy = widths.defVY;
}

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;
}

double GfxCIDFont::getWidth(CID cid) {
  double w;

  getHorizontalMetrics(cid, &w);
  return w;
}

GBool GfxCIDFont::problematicForUnicode() {
  GString *nameLC;
  GBool symbolic;

  // potential inputs:
  // - font is embedded (GfxFont.embFontID.num >= 0)
  // - font name (GfxFont.name)
  // - font type (GfxFont.type)
  // - symbolic (GfxFont.flags & fontSymbolic)
  // - has a ToUnicode map (GfxFont.hasToUnicode)
  // - collection is Adobe-Identity or Adobe-UCS
  //   (GfxCIDFont.collection - compare string)
  // - collection is known AdobeCJK (GfxCIDFont.hasKnownCollection)
  // - has non-Identity CIDToGIDMap (GfxCIDFont.cidToGID != NULL)
  // - has Identity CIDToGIDMap (GfxCIDFont.hasIdentityCIDToGID)

  if (name) {
    nameLC = name->copy();
    nameLC->lowerCase();
    symbolic = strstr(nameLC->getCString(), "dingbat") ||
               strstr(nameLC->getCString(), "wingding") ||
               strstr(nameLC->getCString(), "commpi");
    delete nameLC;
    if (symbolic) {
      return gFalse;
    }
  }

  if (embFontID.num >= 0) {
    switch (type) {
    case fontCIDType0:
    case fontCIDType0C:
    case fontCIDType0COT:
      return !hasToUnicode && !hasKnownCollection;

    case fontCIDType2:
    case fontCIDType2OT:
      return !hasToUnicode && !hasKnownCollection;

    default:
      return !hasToUnicode;
    }

  } else {
    return !hasToUnicode;
  }
}

GBool GfxCIDFont::parensAreSwapped(XRef *xref) {
  char *buf = NULL;
  FoFiTrueType *ff = NULL;
  int bufLen;
  int unicodeCmap, leftParenGID, rightParenGID, leftParenCID, rightParenCID;
  Unicode leftParenUnicode, rightParenUnicode;
  GBool swapped;

  // only relevant for embedded TrueType fonts, with unknown char
  // collections, and with ToUnicode maps
  if ((type != fontCIDType2 && type != fontCIDType2OT) ||
      embFontID.num < 0 ||
      hasKnownCollection ||
      !hasToUnicode) {
    return gFalse;
  }

  // read the embedded font and construct a FoFiTrueType
  if (!(buf = readEmbFontFile(xref, &bufLen))) {
    goto err;
  }
  if (!(ff = FoFiTrueType::make(buf, bufLen, 0))) {
    goto err;
  }

  // find the TrueType Unicode cmap
  unicodeCmap = -1;
  for (int i = 0; i < ff->getNumCmaps(); ++i) {
    int cmapPlatform = ff->getCmapPlatform(i);
    int cmapEncoding = ff->getCmapEncoding(i);
    if ((cmapPlatform == 3 && cmapEncoding == 1) ||
  (cmapPlatform == 0 && cmapEncoding <= 4)) {
      unicodeCmap = i;
      break;
    }
  }
  if (unicodeCmap < 0) {
    goto err;
  }

  // map parens to GIDs using the TrueType Unicode cmap
  leftParenGID = ff->mapCodeToGID(unicodeCmap, 0x28);
  rightParenGID = ff->mapCodeToGID(unicodeCmap, 0x29);
  if (leftParenGID == 0 || rightParenGID == 0) {
    goto err;
  }

  // map GIDs to CIDs using the inverted CIDToGID map
  leftParenCID = -1;
  rightParenCID = -1;
  if (cidToGID) {
    for (int i = 0;
   i <= cidToGIDLen && leftParenCID < 0 && rightParenCID < 0;
   ++i) {
      if (cidToGID[i] == leftParenGID) {
  leftParenCID = i;
      } else if (cidToGID[i] == rightParenGID) {
  rightParenCID = i;
      }
    }
    if (leftParenCID < 0 || rightParenCID < 0) {
      goto err;
    }
  } else {
    leftParenCID = leftParenGID;
    rightParenCID = rightParenGID;
  }

  // map CIDs to Unicode using the ToUnicode map
  if (ctu->mapToUnicode((CharCode)leftParenCID, &leftParenUnicode, 1) < 1 ||
      ctu->mapToUnicode((CharCode)rightParenCID, &rightParenUnicode, 1) < 1) {
    goto err;
  }

  // check for swap
  swapped = leftParenUnicode == 0x29 && rightParenUnicode == 0x28;

  delete ff;
  ff = NULL;
  gfree(buf);
  buf = NULL;

  return swapped;

 err:
  if (ff) {
    delete ff;
  }
  if (buf) {
    gfree(buf);
  }
  return gFalse;
}

//------------------------------------------------------------------------
// GfxFontDict
//------------------------------------------------------------------------

class GfxFontDictEntry {
public:

  GfxFontDictEntry(Ref refA, Object *fontObjA);
  ~GfxFontDictEntry();
  void load(GfxFont *fontA);

  GBool loaded;
  Ref ref;
  Object fontObj;   // valid if unloaded
  GfxFont *font;    // valid if loaded
};

GfxFontDictEntry::GfxFontDictEntry(Ref refA, Object *fontObjA) {
  loaded = gFalse;
  ref = refA;
  fontObjA->copy(&fontObj);
  font = NULL;
}

GfxFontDictEntry::~GfxFontDictEntry() {
  // NB: If the font has been loaded, font is non-NULL and is owned by
  // GfxFontDict.uniqueFonts.
  if (!loaded) {
    fontObj.free();
  }
}

void GfxFontDictEntry::load(GfxFont *fontA) {
  loaded = gTrue;
  font = fontA;
  fontObj.free();
}

GfxFontDict::GfxFontDict(XRef *xrefA, Ref *fontDictRef, Dict *fontDict) {
  xref = xrefA;
  fonts = new GHash(gTrue);
  uniqueFonts = new GList();

  for (int i = 0; i < fontDict->getLength(); ++i) {
    char *tag = fontDict->getKey(i);
    Object fontObj;
    fontDict->getValNF(i, &fontObj);
    Ref r;
    if (fontObj.isRef()) {
      r = fontObj.getRef();
    } else if (fontDictRef) {
      // legal generation numbers are five digits, so we use a
      // 6-digit number here
      r.gen = 100000 + fontDictRef->num;
      r.num = i;
    } else {
      // no indirect reference for this font, or for the containing
      // font dict, so hash the font and use that
      r.gen = 100000;
      r.num = hashFontObject(&fontObj);
    }
    fonts->add(new GString(tag), new GfxFontDictEntry(r, &fontObj));
    fontObj.free();
  }
}

GfxFontDict::~GfxFontDict() {
  deleteGList(uniqueFonts, GfxFont);
  deleteGHash(fonts, GfxFontDictEntry);
}

GfxFont *GfxFontDict::lookup(char *tag) {
  GfxFontDictEntry *entry = (GfxFontDictEntry *)fonts->lookup(tag);
  if (!entry) {
    return NULL;
  }
  load(tag, entry);
  return entry->font;
}

GfxFont *GfxFontDict::lookupByRef(Ref ref) {
  GHashIter *iter;
  GString *tag;
  GfxFontDictEntry *entry;
  fonts->startIter(&iter);
  while (fonts->getNext(&iter, &tag, (void **)&entry)) {
    if (entry->ref.num == ref.num && entry->ref.gen == ref.gen) {
      fonts->killIter(&iter);
      load(tag->getCString(), entry);
      return entry->font;
    }
  }
  return NULL;
}

int GfxFontDict::getNumFonts() {
  loadAll();
  return uniqueFonts->getLength();
}

GfxFont *GfxFontDict::getFont(int i) {
  return (GfxFont *)uniqueFonts->get(i);
}

void GfxFontDict::loadAll() {
  GHashIter *iter;
  GString *tag;
  GfxFontDictEntry *entry;
  fonts->startIter(&iter);
  while (fonts->getNext(&iter, &tag, (void **)&entry)) {
    load(tag->getCString(), entry);
  }
}

void GfxFontDict::load(char *tag, GfxFontDictEntry *entry) {
  if (entry->loaded) {
    return;
  }

  // check for a duplicate that has already been loaded
  // (don't do this for "synthetic" refs)
  if (entry->fontObj.isRef()) {
    for (int i = 0; i < uniqueFonts->getLength(); ++i) {
      GfxFont *font = (GfxFont *)uniqueFonts->get(i);
      if (font->getID()->num == entry->ref.num &&
    font->getID()->gen == entry->ref.gen) {
  entry->load(font);
  return;
      }
    }
  }

  GfxFont *font = NULL;
  Object obj;
  entry->fontObj.fetch(xref, &obj);
  if (obj.isDict()) {
    font = GfxFont::makeFont(xref, tag, entry->ref, obj.getDict());
    if (font->isOk()) {
      uniqueFonts->append(font);
    } else {
      delete font;
      font = NULL;
    }
  } else {
    error(errSyntaxError, -1, "font resource is not a dictionary");
  }
  obj.free();
  entry->load(font);
}

// FNV-1a hash
class FNVHash {
public:

  FNVHash() {
    h = 2166136261U;
  }

  void hash(char c) {
    h ^= c & 0xff;
    h *= 16777619;
  }

  void hash(char *p, int n) {
    int i;
    for (i = 0; i < n; ++i) {
      hash(p[i]);
    }
  }

  int get31() {
    return (h ^ (h >> 31)) & 0x7fffffff;
  }

private:

  Guint h;
};

int GfxFontDict::hashFontObject(Object *obj) {
  FNVHash h;

  hashFontObject1(obj, &h);
  return h.get31();
}

void GfxFontDict::hashFontObject1(Object *obj, FNVHash *h) {
  Object obj2;
  GString *s;
  char *p;
  double r;
  int n, i;

  switch (obj->getType()) {
  case objBool:
    h->hash('b');
    h->hash(obj->getBool() ? 1 : 0);
    break;
  case objInt:
    h->hash('i');
    n = obj->getInt();
    h->hash((char *)&n, sizeof(int));
    break;
  case objReal:
    h->hash('r');
    r = obj->getReal();
    h->hash((char *)&r, sizeof(double));
    break;
  case objString:
    h->hash('s');
    s = obj->getString();
    h->hash(s->getCString(), s->getLength());
    break;
  case objName:
    h->hash('n');
    p = obj->getName();
    h->hash(p, (int)strlen(p));
    break;
  case objNull:
    h->hash('z');
    break;
  case objArray:
    h->hash('a');
    n = obj->arrayGetLength();
    h->hash((char *)&n, sizeof(int));
    for (i = 0; i < n; ++i) {
      obj->arrayGetNF(i, &obj2);
      hashFontObject1(&obj2, h);
      obj2.free();
    }
    break;
  case objDict:
    h->hash('d');
    n = obj->dictGetLength();
    h->hash((char *)&n, sizeof(int));
    for (i = 0; i < n; ++i) {
      p = obj->dictGetKey(i);
      h->hash(p, (int)strlen(p));
      obj->dictGetValNF(i, &obj2);
      hashFontObject1(&obj2, h);
      obj2.free();
    }
    break;
  case objStream:
    // this should never happen - streams must be indirect refs
    break;
  case objRef:
    h->hash('f');
    n = obj->getRefNum();
    h->hash((char *)&n, sizeof(int));
    n = obj->getRefGen();
    h->hash((char *)&n, sizeof(int));
    break;
  default:
    h->hash('u');
    break;
  }
}

Coverage Report

Created: 2026-04-09 06:17