fofitruetype.cc

swf文件查看工具,能够看flash文件的格式

//========================================================================
//
// FoFiTrueType.cc
//
// Copyright 1999-2003 Glyph & Cog, LLC
//
//========================================================================

#include <aconf.h>

#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif

#include <stdlib.h>
#include <string.h>
#include "gtypes.h"
#include "gmem.h"
#include "GString.h"
#include "GHash.h"
#include "FoFiType1C.h"
#include "FoFiTrueType.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 {
  Guint tag;
  Guint 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

static int cmpTrueTypeLocaOffset(const void *p1, const void *p2) {
  TrueTypeLoca *loca1 = (TrueTypeLoca *)p1;
  TrueTypeLoca *loca2 = (TrueTypeLoca *)p2;

  if (loca1->origOffset == loca2->origOffset) {
    return loca1->idx - loca2->idx;
  }
  return loca1->origOffset - loca2->origOffset;
}

static int cmpTrueTypeLocaIdx(const void *p1, const void *p2) {
  TrueTypeLoca *loca1 = (TrueTypeLoca *)p1;
  TrueTypeLoca *loca2 = (TrueTypeLoca *)p2;

  return loca1->idx - loca2->idx;
}

static int cmpTrueTypeTableTag(const void *p1, const void *p2) {
  TrueTypeTable *tab1 = (TrueTypeTable *)p1;
  TrueTypeTable *tab2 = (TrueTypeTable *)p2;

  return (int)tab1->tag - (int)tab2->tag;
}

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

struct T42Table {
  char *tag;			// 4-byte tag
  GBool 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 ", gTrue  },
  { "fpgm", gTrue  },
  { "glyf", gTrue  },
  { "head", gTrue  },
  { "hhea", gTrue  },
  { "hmtx", gTrue  },
  { "loca", gTrue  },
  { "maxp", gTrue  },
  { "prep", gTrue  },
  { "vhea", gFalse },
  { "vmtx", gFalse }
};
#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 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",            "mu1",
  "partialdiff",    "summation",      "product",        "pi",
  "integral",       "ordfeminine",    "ordmasculine",   "Ohm",
  "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(char *fileA, int lenA) {
  FoFiTrueType *ff;

  ff = new FoFiTrueType(fileA, lenA, gFalse);
  if (!ff->parsedOk) {
    delete ff;
    return NULL;
  }
  return ff;
}

FoFiTrueType *FoFiTrueType::load(char *fileName) {
  FoFiTrueType *ff;
  char *fileA;
  int lenA;

  if (!(fileA = FoFiBase::readFile(fileName, &lenA))) {
    return NULL;
  }
  ff = new FoFiTrueType(fileA, lenA, gTrue);
  if (!ff->parsedOk) {
    delete ff;
    return NULL;
  }
  return ff;
}

FoFiTrueType::FoFiTrueType(char *fileA, int lenA, GBool freeFileDataA):
  FoFiBase(fileA, lenA, freeFileDataA)
{
  tables = NULL;
  nTables = 0;
  cmaps = NULL;
  nCmaps = 0;
  nameToGID = NULL;
  parsedOk = gFalse;

  parse();
}

FoFiTrueType::~FoFiTrueType() {
  gfree(tables);
  gfree(cmaps);
  if (nameToGID) {
    delete nameToGID;
  }
}

int FoFiTrueType::getNumCmaps() {
  return nCmaps;
}

int FoFiTrueType::getCmapPlatform(int i) {
  return cmaps[i].platform;
}

int FoFiTrueType::getCmapEncoding(int i) {
  return cmaps[i].encoding;
}

int FoFiTrueType::findCmap(int platform, int encoding) {
  int i;

  for (i = 0; i < nCmaps; ++i) {
    if (cmaps[i].platform == platform && cmaps[i].encoding == encoding) {
      return i;
    }
  }
  return -1;
}

Gushort FoFiTrueType::mapCodeToGID(int i, int c) {
  Gushort gid;
  int segCnt, segEnd, segStart, segDelta, segOffset;
  int cmapFirst, cmapLen;
  int pos, a, b, m;
  GBool ok;

  if (i < 0 || i >= nCmaps) {
    return 0;
  }
  ok = gTrue;
  pos = cmaps[i].offset;
  switch (cmaps[i].fmt) {
  case 0:
    if (c < 0 || c >= cmaps[i].len - 6) {
      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;
  default:
    return 0;
  }
  if (!ok) {
    return 0;
  }
  return gid;
}

int FoFiTrueType::mapNameToGID(char *name) {
  if (!nameToGID) {
    return 0;
  }
  return nameToGID->lookupInt(name);
}

Gushort *FoFiTrueType::getCIDToGIDMap(int *nCIDs) {
  FoFiType1C *ff;
  Gushort *map;
  int i;

  *nCIDs = 0;
  if (!openTypeCFF) {
    return NULL;
  }