/*
** This is the central routine of this section.
*/
void ttfont_CharStrings(TTStreamWriter& stream, struct TTFONT *font, std::vector<int>& glyph_ids)
    {
    Fixed post_format;

    /* The 'post' table format number. */
    post_format = getFixed( font->post_table );

    if( post_format.whole != 2 || post_format.fraction != 0 )
        throw TTException("TrueType fontdoes not have a format 2.0 'post' table");

    /* Emmit the start of the PostScript code to define the dictionary. */
    stream.printf("/CharStrings %d dict dup begin\n", glyph_ids.size());

    /* Emmit one key-value pair for each glyph. */
    for(std::vector<int>::const_iterator i = glyph_ids.begin();
        i != glyph_ids.end(); ++i)
        {
        if(font->target_type == PS_TYPE_42)     /* type 42 */
            {
            stream.printf("/%s %d def\n",ttfont_CharStrings_getname(font, *i), *i);
            }
        else                            /* type 3 */
            {
            stream.printf("/%s{",ttfont_CharStrings_getname(font, *i));

            tt_type3_charproc(stream, font, *i);

            stream.putline("}_d");      /* "} bind def" */
            }
        }

    stream.putline("end readonly def");
    } /* end of ttfont_CharStrings() */

/*
** This is called once at the start.
*/
void sfnts_start(TTStreamWriter& stream)
{
    stream.puts("/sfnts[<");
    in_string=TRUE;
    string_len=0;
    line_len=8;
} /* end of sfnts_start() */

void GlyphToType3::stack_end(TTStreamWriter& stream)                    /* called at end */
{
    if ( !pdf_mode && stack_depth )
    {
        stream.puts("}_e");
        stack_depth=0;
    }
} /* end of stack_end() */

/*
** This routine is used to break the character
** procedure up into a number of smaller
** procedures.  This is necessary so as not to
** overflow the stack on certain level 1 interpreters.
**
** Prepare to push another item onto the stack,
** starting a new proceedure if necessary.
**
** Not all the stack depth calculations in this routine
** are perfectly accurate, but they do the job.
*/
void GlyphToType3::stack(TTStreamWriter& stream, int new_elem)
{
    if ( !pdf_mode && num_pts > 25 )                    /* Only do something of we will */
    {
        /* have a log of points. */
        if (stack_depth == 0)
        {
            stream.put_char('{');
            stack_depth=1;
        }

        stack_depth += new_elem;                /* Account for what we propose to add */

        if (stack_depth > 100)
        {
            stream.puts("}_e{");
            stack_depth = 3 + new_elem; /* A rough estimate */
        }
    }
} /* end of stack() */

/*-------------------------------------------------------------
** Define the encoding array for this font.
** Since we don't really want to deal with converting all of
** the possible font encodings in the wild to a standard PS
** one, we just explicitly create one for each font.
-------------------------------------------------------------*/
void ttfont_encoding(TTStreamWriter& stream, struct TTFONT *font, std::vector<int>& glyph_ids, font_type_enum target_type)
{
    if (target_type == PS_TYPE_3 || target_type == PS_TYPE_42_3_HYBRID)
    {
        stream.printf("/Encoding [ ");

        for (std::vector<int>::const_iterator i = glyph_ids.begin();
                i != glyph_ids.end(); ++i)
        {
            const char* name = ttfont_CharStrings_getname(font, *i);
            stream.printf("/%s ", name);
        }

        stream.printf("] def\n");
    }
    else
    {
        stream.putline("/Encoding StandardEncoding def");
    }
} /* end of ttfont_encoding() */

/*
** Write a BYTE as a hexadecimal value as part of the sfnts array.
*/
void sfnts_pputBYTE(TTStreamWriter& stream, BYTE n)
{
    static const char hexdigits[]="0123456789ABCDEF";

    if (!in_string)
    {
        stream.put_char('<');
        string_len=0;
        line_len++;
        in_string=TRUE;
    }

    stream.put_char( hexdigits[ n / 16 ] );
    stream.put_char( hexdigits[ n % 16 ] );
    string_len++;
    line_len+=2;

    if (line_len > 70)
    {
        stream.put_char('\n');
        line_len=0;
    }

} /* end of sfnts_pputBYTE() */

/*
** This is called whenever it is
** necessary to end a string in the sfnts array.
**
** (The array must be broken into strings which are
** no longer than 64K characters.)
*/
void sfnts_end_string(TTStreamWriter& stream)
{
    if (in_string)
    {
        string_len=0;           /* fool sfnts_pputBYTE() */

#ifdef DEBUG_TRUETYPE_INLINE
        puts("\n% dummy byte:\n");
#endif

        sfnts_pputBYTE(stream, 0);      /* extra byte for pre-2013 compatibility */
        stream.put_char('>');
        line_len++;
    }
    in_string=FALSE;
} /* end of sfnts_end_string() */

/*
** We call this routine to emmit the PostScript code
** for the character we have loaded with load_char().
*/
void GlyphToType3::PSConvert(TTStreamWriter& stream)
{
    int i,j,k;

    assert(area_ctr == NULL);
    area_ctr=(double*)calloc(num_ctr, sizeof(double));
    memset(area_ctr, 0, (num_ctr*sizeof(double)));
    assert(check_ctr == NULL);
    check_ctr=(char*)calloc(num_ctr, sizeof(char));
    memset(check_ctr, 0, (num_ctr*sizeof(char)));
    assert(ctrset == NULL);
    ctrset=(int*)calloc(num_ctr, 2*sizeof(int));
    memset(ctrset, 0, (num_ctr*2*sizeof(int)));

    check_ctr[0]=1;
    area_ctr[0]=area(xcoor, ycoor, epts_ctr[0]+1);

    for (i=1; i<num_ctr; i++)
    {
        area_ctr[i]=area(xcoor+epts_ctr[i-1]+1, ycoor+epts_ctr[i-1]+1, epts_ctr[i]-epts_ctr[i-1]);
    }

    for (i=0; i<num_ctr; i++)
    {
        if (area_ctr[i]>0)
        {
            ctrset[2*i]=i;
            ctrset[2*i+1]=nearout(i);
        }
        else
        {
            ctrset[2*i]=-1;
            ctrset[2*i+1]=-1;
        }
    }

    /* Step thru the coutours. */
    /* I believe that a contour is a detatched */
    /* set of curves and lines. */
    for(i = j = k = 0;
        i != NOMOREOUTCTR && i < num_ctr;
        k = nextinctr(i, k), (k == NOMOREINCTR && (i = k = nextoutctr(i))))
    {
        // A TrueType contour consists of on-path and off-path points.
        // Two consecutive on-path points are to be joined with a
        // line; off-path points between on-path points indicate a
        // quadratic spline, where the off-path point is the control
        // point. Two consecutive off-path points have an implicit
        // on-path point midway between them.
        std::list<FlaggedPoint> points;

        // Represent flags and x/y coordinates as a C++ list
        for (; j <= epts_ctr[k]; j++)
        {
            if (!(tt_flags[j] & 1)) {
                points.push_back(FlaggedPoint(OFF_PATH, xcoor[j], ycoor[j]));
            } else {
                points.push_back(FlaggedPoint(ON_PATH, xcoor[j], ycoor[j]));
            }
        }

        if (points.size() == 0) {
            // Don't try to access the last element of an empty list
            continue;
        }

        // For any two consecutive off-path points, insert the implied
        // on-path point.
        FlaggedPoint prev = points.back();
        for (std::list<FlaggedPoint>::iterator it = points.begin();
             it != points.end();
             it++)
        {
            if (prev.flag == OFF_PATH && it->flag == OFF_PATH)
            {
                points.insert(it,
                              FlaggedPoint(ON_PATH,
                                           (prev.x + it->x) / 2,
                                           (prev.y + it->y) / 2));
            }
            prev = *it;
        }
        // Handle the wrap-around: insert a point either at the beginning
        // or at the end that has the same coordinates as the opposite point.
        // This also ensures that the initial point is ON_PATH.
        if (points.front().flag == OFF_PATH)
        {
            assert(points.back().flag == ON_PATH);
            points.insert(points.begin(), points.back());
        }
        else
        {
            assert(points.front().flag == ON_PATH);
            points.push_back(points.front());
        }

//.........这里部分代码省略.........

/*
** We call this routine to emmit the PostScript code
** for the character we have loaded with load_char().
*/
void GlyphToType3::PSConvert(TTStreamWriter& stream)
{
    int j, k;

    /* Step thru the contours.
     * j = index to xcoor, ycoor, tt_flags (point data)
     * k = index to epts_ctr (which points belong to the same contour) */
    for(j = k = 0; k < num_ctr; k++)
    {
        // A TrueType contour consists of on-path and off-path points.
        // Two consecutive on-path points are to be joined with a
        // line; off-path points between on-path points indicate a
        // quadratic spline, where the off-path point is the control
        // point. Two consecutive off-path points have an implicit
        // on-path point midway between them.
        std::list<FlaggedPoint> points;

        // Represent flags and x/y coordinates as a C++ list
        for (; j <= epts_ctr[k]; j++)
        {
            if (!(tt_flags[j] & 1)) {
                points.push_back(FlaggedPoint(OFF_PATH, xcoor[j], ycoor[j]));
            } else {
                points.push_back(FlaggedPoint(ON_PATH, xcoor[j], ycoor[j]));
            }
        }

        if (points.size() == 0) {
            // Don't try to access the last element of an empty list
            continue;
        }

        // For any two consecutive off-path points, insert the implied
        // on-path point.
        FlaggedPoint prev = points.back();
        for (std::list<FlaggedPoint>::iterator it = points.begin();
             it != points.end();
             it++)
        {
            if (prev.flag == OFF_PATH && it->flag == OFF_PATH)
            {
                points.insert(it,
                              FlaggedPoint(ON_PATH,
                                           (prev.x + it->x) / 2,
                                           (prev.y + it->y) / 2));
            }
            prev = *it;
        }
        // Handle the wrap-around: insert a point either at the beginning
        // or at the end that has the same coordinates as the opposite point.
        // This also ensures that the initial point is ON_PATH.
        if (points.front().flag == OFF_PATH)
        {
            assert(points.back().flag == ON_PATH);
            points.insert(points.begin(), points.back());
        }
        else
        {
            assert(points.front().flag == ON_PATH);
            points.push_back(points.front());
        }

        // The first point
        stack(stream, 3);
        PSMoveto(stream, points.front().x, points.front().y);

        // Step through the remaining points
        std::list<FlaggedPoint>::const_iterator it = points.begin();
        for (it++; it != points.end(); /* incremented inside */)
        {
            const FlaggedPoint& point = *it;
            if (point.flag == ON_PATH)
            {
                stack(stream, 3);
                PSLineto(stream, point.x, point.y);
                it++;
            } else {
                std::list<FlaggedPoint>::const_iterator prev = it, next = it;
                prev--;
                next++;
                assert(prev->flag == ON_PATH);
                assert(next->flag == ON_PATH);
                stack(stream, 7);
                PSCurveto(stream,
                          prev->x, prev->y,
                          point.x, point.y,
                          next->x, next->y);
                it++;
                it++;
            }
        }
    }

    /* Now, we can fill the whole thing. */
    stack(stream, 1);
    stream.puts( pdf_mode ? "f" : "_cl" );
//.........这里部分代码省略.........

/*----------------------------------------------------------------
** Emmit the code to finish up the dictionary and turn
** it into a font.
----------------------------------------------------------------*/
void ttfont_trailer(TTStreamWriter& stream, struct TTFONT *font)
{
    /* If we are generating a type 3 font, we need to provide */
    /* a BuildGlyph and BuildChar proceedures. */
    if (font->target_type == PS_TYPE_3 ||
        font->target_type == PS_TYPE_42_3_HYBRID)
    {
        stream.put_char('\n');

        stream.putline("/BuildGlyph");
        stream.putline(" {exch begin");         /* start font dictionary */
        stream.putline(" CharStrings exch");
        stream.putline(" 2 copy known not{pop /.notdef}if");
        stream.putline(" true 3 1 roll get exec");
        stream.putline(" end}_d");

        stream.put_char('\n');

        /* This proceedure is for compatiblity with */
        /* level 1 interpreters. */
        stream.putline("/BuildChar {");
        stream.putline(" 1 index /Encoding get exch get");
        stream.putline(" 1 index /BuildGlyph get exec");
        stream.putline("}_d");

        stream.put_char('\n');
    }

    /* If we are generating a type 42 font, we need to check to see */
    /* if this PostScript interpreter understands type 42 fonts.  If */
    /* it doesn't, we will hope that the Apple TrueType rasterizer */
    /* has been loaded and we will adjust the font accordingly. */
    /* I found out how to do this by examining a TrueType font */
    /* generated by a Macintosh.  That is where the TrueType interpreter */
    /* setup instructions and part of BuildGlyph came from. */
    if (font->target_type == PS_TYPE_42 ||
        font->target_type == PS_TYPE_42_3_HYBRID)
    {
        stream.put_char('\n');

        /* If we have no "resourcestatus" command, or FontType 42 */
        /* is unknown, leave "true" on the stack. */
        stream.putline("systemdict/resourcestatus known");
        stream.putline(" {42 /FontType resourcestatus");
        stream.putline("   {pop pop false}{true}ifelse}");
        stream.putline(" {true}ifelse");

        /* If true, execute code to produce an error message if */
        /* we can't find Apple's TrueDict in VM. */
        stream.putline("{/TrueDict where{pop}{(%%[ Error: no TrueType rasterizer ]%%)= flush}ifelse");

        /* Since we are expected to use Apple's TrueDict TrueType */
        /* reasterizer, change the font type to 3. */
        stream.putline("/FontType 3 def");

        /* Define a string to hold the state of the Apple */
        /* TrueType interpreter. */
        stream.putline(" /TrueState 271 string def");

        /* It looks like we get information about the resolution */
        /* of the printer and store it in the TrueState string. */
        stream.putline(" TrueDict begin sfnts save");
        stream.putline(" 72 0 matrix defaultmatrix dtransform dup");
        stream.putline(" mul exch dup mul add sqrt cvi 0 72 matrix");
        stream.putline(" defaultmatrix dtransform dup mul exch dup");
        stream.putline(" mul add sqrt cvi 3 -1 roll restore");
        stream.putline(" TrueState initer end");

        /* This BuildGlyph procedure will look the name up in the */
        /* CharStrings array, and then check to see if what it gets */
        /* is a procedure.  If it is, it executes it, otherwise, it */
        /* lets the TrueType rasterizer loose on it. */

        /* When this proceedure is executed the stack contains */
        /* the font dictionary and the character name.  We */
        /* exchange arguments and move the dictionary to the */
        /* dictionary stack. */
        stream.putline(" /BuildGlyph{exch begin");
        /* stack: charname */

        /* Put two copies of CharStrings on the stack and consume */
        /* one testing to see if the charname is defined in it, */
        /* leave the answer on the stack. */
        stream.putline("  CharStrings dup 2 index known");
        /* stack: charname CharStrings bool */

        /* Exchange the CharStrings dictionary and the charname, */
        /* but if the answer was false, replace the character name */
        /* with ".notdef". */
        stream.putline("    {exch}{exch pop /.notdef}ifelse");
        /* stack: CharStrings charname */

        /* Get the value from the CharStrings dictionary and see */
        /* if it is executable. */
        stream.putline("  get dup xcheck");
        /* stack: CharStrings_entry */
//.........这里部分代码省略.........

/*-----------------------------------------------------------
** Create the optional "FontInfo" sub-dictionary.
-----------------------------------------------------------*/
void ttfont_FontInfo(TTStreamWriter& stream, struct TTFONT *font)
{
    Fixed ItalicAngle;

    /* We create a sub dictionary named "FontInfo" where we */
    /* store information which though it is not used by the */
    /* interpreter, is useful to some programs which will */
    /* be printing with the font. */
    stream.putline("/FontInfo 10 dict dup begin");

    /* These names come from the TrueType font's "name" table. */
    stream.printf("/FamilyName (%s) def\n",font->FamilyName);
    stream.printf("/FullName (%s) def\n",font->FullName);

    if ( font->Copyright != (char*)NULL || font->Trademark != (char*)NULL )
    {
        stream.printf("/Notice (%s",
                      font->Copyright != (char*)NULL ? font->Copyright : "");
        stream.printf("%s%s) def\n",
                      font->Trademark != (char*)NULL ? " " : "",
                      font->Trademark != (char*)NULL ? font->Trademark : "");
    }

    /* This information is not quite correct. */
    stream.printf("/Weight (%s) def\n",font->Style);

    /* Some fonts have this as "version". */
    stream.printf("/Version (%s) def\n",font->Version);

    /* Some information from the "post" table. */
    ItalicAngle = getFixed( font->post_table + 4 );
    stream.printf("/ItalicAngle %d.%d def\n",ItalicAngle.whole,ItalicAngle.fraction);
    stream.printf("/isFixedPitch %s def\n", getULONG( font->post_table + 12 ) ? "true" : "false" );
    stream.printf("/UnderlinePosition %d def\n", (int)getFWord( font->post_table + 8 ) );
    stream.printf("/UnderlineThickness %d def\n", (int)getFWord( font->post_table + 10 ) );
    stream.putline("end readonly def");
} /* end of ttfont_FontInfo() */

/*---------------------------------------------------------------------
** Write the header for a PostScript font.
---------------------------------------------------------------------*/
void ttfont_header(TTStreamWriter& stream, struct TTFONT *font)
{
    int VMMin;
    int VMMax;

    /*
    ** To show that it is a TrueType font in PostScript format,
    ** we will begin the file with a specific string.
    ** This string also indicates the version of the TrueType
    ** specification on which the font is based and the
    ** font manufacturer's revision number for the font.
    */
    if ( font->target_type == PS_TYPE_42 ||
            font->target_type == PS_TYPE_42_3_HYBRID)
    {
        stream.printf("%%!PS-TrueTypeFont-%d.%d-%d.%d\n",
                      font->TTVersion.whole, font->TTVersion.fraction,
                      font->MfrRevision.whole, font->MfrRevision.fraction);
    }

    /* If it is not a Type 42 font, we will use a different format. */
    else
    {
        stream.putline("%!PS-Adobe-3.0 Resource-Font");
    }       /* See RBIIp 641 */

    /* We will make the title the name of the font. */
    stream.printf("%%%%Title: %s\n",font->FullName);

    /* If there is a Copyright notice, put it here too. */
    if ( font->Copyright != (char*)NULL )
    {
        stream.printf("%%%%Copyright: %s\n",font->Copyright);
    }

    /* We created this file. */
    if ( font->target_type == PS_TYPE_42 )
    {
        stream.putline("%%Creator: Converted from TrueType to type 42 by PPR");
    }
    else if (font->target_type == PS_TYPE_42_3_HYBRID)
    {
        stream.putline("%%Creator: Converted from TypeType to type 42/type 3 hybrid by PPR");
    }
    else
    {
        stream.putline("%%Creator: Converted from TrueType to type 3 by PPR");
    }

    /* If VM usage information is available, print it. */
    if ( font->target_type == PS_TYPE_42 || font->target_type == PS_TYPE_42_3_HYBRID)
    {
        VMMin = (int)getULONG( font->post_table + 16 );
        VMMax = (int)getULONG( font->post_table + 20 );
        if ( VMMin > 0 && VMMax > 0 )
            stream.printf("%%%%VMUsage: %d %d\n",VMMin,VMMax);
    }

    /* Start the dictionary which will eventually */
    /* become the font. */
    if (font->target_type == PS_TYPE_42)
    {
        stream.putline("15 dict begin");
    }
    else
    {
        stream.putline("25 dict begin");

        /* Type 3 fonts will need some subroutines here. */
        stream.putline("/_d{bind def}bind def");
        stream.putline("/_m{moveto}_d");
        stream.putline("/_l{lineto}_d");
        stream.putline("/_cl{closepath eofill}_d");
        stream.putline("/_c{curveto}_d");
        stream.putline("/_sc{7 -1 roll{setcachedevice}{pop pop pop pop pop pop}ifelse}_d");
        stream.putline("/_e{exec}_d");
    }

    stream.printf("/FontName /%s def\n",font->PostName);
    stream.putline("/PaintType 0 def");

    if (font->target_type == PS_TYPE_42 || font->target_type == PS_TYPE_42_3_HYBRID)
    {
        stream.putline("/FontMatrix[1 0 0 1 0 0]def");
    }
    else
    {
        stream.putline("/FontMatrix[.001 0 0 .001 0 0]def");
    }

    stream.printf("/FontBBox[%d %d %d %d]def\n",font->llx-1,font->lly-1,font->urx,font->ury);
    if (font->target_type == PS_TYPE_42 || font->target_type == PS_TYPE_42_3_HYBRID)
    {
        stream.printf("/FontType 42 def\n", font->target_type );
    }
    else
    {
//.........这里部分代码省略.........

/*
** Emmit PostScript code for a composite character.
*/
void GlyphToType3::do_composite(TTStreamWriter& stream, struct TTFONT *font, BYTE *glyph)
{
    USHORT flags;
    USHORT glyphIndex;
    int arg1;
    int arg2;
    USHORT xscale;
    USHORT yscale;
    USHORT scale01;
    USHORT scale10;

    /* Once around this loop for each component. */
    do
    {
        flags = getUSHORT(glyph);       /* read the flags word */
        glyph += 2;

        glyphIndex = getUSHORT(glyph);  /* read the glyphindex word */
        glyph += 2;

        if (flags & ARG_1_AND_2_ARE_WORDS)
        {
            /* The tt spec. seems to say these are signed. */
            arg1 = getSHORT(glyph);
            glyph += 2;
            arg2 = getSHORT(glyph);
            glyph += 2;
        }
        else                    /* The tt spec. does not clearly indicate */
        {
            /* whether these values are signed or not. */
            arg1 = *(signed char *)(glyph++);
            arg2 = *(signed char *)(glyph++);
        }

        if (flags & WE_HAVE_A_SCALE)
        {
            xscale = yscale = getUSHORT(glyph);
            glyph += 2;
            scale01 = scale10 = 0;
        }
        else if (flags & WE_HAVE_AN_X_AND_Y_SCALE)
        {
            xscale = getUSHORT(glyph);
            glyph += 2;
            yscale = getUSHORT(glyph);
            glyph += 2;
            scale01 = scale10 = 0;
        }
        else if (flags & WE_HAVE_A_TWO_BY_TWO)
        {
            xscale = getUSHORT(glyph);
            glyph += 2;
            scale01 = getUSHORT(glyph);
            glyph += 2;
            scale10 = getUSHORT(glyph);
            glyph += 2;
            yscale = getUSHORT(glyph);
            glyph += 2;
        }
        else
        {
            xscale = yscale = scale01 = scale10 = 0;
        }

        /* Debugging */
#ifdef DEBUG_TRUETYPE
        stream.printf("%% flags=%d, arg1=%d, arg2=%d, xscale=%d, yscale=%d, scale01=%d, scale10=%d\n",
                      (int)flags,arg1,arg2,(int)xscale,(int)yscale,(int)scale01,(int)scale10);
#endif

        if (pdf_mode)
        {
            if ( flags & ARGS_ARE_XY_VALUES )
            {
                /* We should have been able to use 'Do' to reference the
                   subglyph here.  However, that doesn't seem to work with
                   xpdf or gs (only acrobat), so instead, this just includes
                   the subglyph here inline. */
                stream.printf("q 1 0 0 1 %d %d cm\n", topost(arg1), topost(arg2));
            }
            else
            {
                stream.printf("%% unimplemented shift, arg1=%d, arg2=%d\n",arg1,arg2);
            }
            GlyphToType3(stream, font, glyphIndex, true);
            if ( flags & ARGS_ARE_XY_VALUES )
            {
                stream.printf("\nQ\n");
            }
        }
        else
        {
            /* If we have an (X,Y) shif and it is non-zero, */
            /* translate the coordinate system. */
            if ( flags & ARGS_ARE_XY_VALUES )
            {
//.........这里部分代码省略.........

/*
** Here is the routine which ties it all together.
**
** Create the array called "sfnts" which
** holds the actual TrueType data.
*/
void ttfont_sfnts(TTStreamWriter& stream, struct TTFONT *font)
{
    static const char *table_names[] =  /* The names of all tables */
    {
        /* which it is worth while */
        "cvt ",                         /* to include in a Type 42 */
        "fpgm",                         /* PostScript font. */
        "glyf",
        "head",
        "hhea",
        "hmtx",
        "loca",
        "maxp",
        "prep"
    } ;

    struct                      /* The location of each of */
    {
        ULONG oldoffset;        /* the above tables. */
        ULONG newoffset;
        ULONG length;
        ULONG checksum;
    } tables[9];

    BYTE *ptr;                  /* A pointer into the origional table directory. */
    ULONG x,y;                  /* General use loop countes. */
    int c;                      /* Input character. */
    int diff;
    ULONG nextoffset;
    int count;                  /* How many `important' tables did we find? */

    ptr = font->offset_table + 12;
    nextoffset=0;
    count=0;

    /*
    ** Find the tables we want and store there vital
    ** statistics in tables[].
    */
    for (x=0; x < 9; x++ )
    {
        do
        {
            diff = strncmp( (char*)ptr, table_names[x], 4 );

            if ( diff > 0 )             /* If we are past it. */
            {
                tables[x].length = 0;
                diff = 0;
            }
            else if ( diff < 0 )        /* If we haven't hit it yet. */
            {
                ptr += 16;
            }
            else if ( diff == 0 )       /* Here it is! */
            {
                tables[x].newoffset = nextoffset;
                tables[x].checksum = getULONG( ptr + 4 );
                tables[x].oldoffset = getULONG( ptr + 8 );
                tables[x].length = getULONG( ptr + 12 );
                nextoffset += ( ((tables[x].length + 3) / 4) * 4 );
                count++;
                ptr += 16;
            }
        }
        while (diff != 0);

    } /* end of for loop which passes over the table directory */

    /* Begin the sfnts array. */
    sfnts_start(stream);

    /* Generate the offset table header */
    /* Start by copying the TrueType version number. */
    ptr = font->offset_table;
    for (x=0; x < 4; x++)
    {
        sfnts_pputBYTE( stream,  *(ptr++) );
    }

    /* Now, generate those silly numTables numbers. */
    sfnts_pputUSHORT(stream, count);            /* number of tables */
    if ( count == 9 )
    {
        sfnts_pputUSHORT(stream, 7);          /* searchRange */
        sfnts_pputUSHORT(stream, 3);          /* entrySelector */
        sfnts_pputUSHORT(stream, 81);         /* rangeShift */
    }
#ifdef DEBUG_TRUETYPE
    else
    {
        debug("only %d tables selected",count);
    }
#endif
//.........这里部分代码省略.........