ftxgsub.c

qt-x11-opensource-src-4.1.4.tar.gz源码

  }


  /* LookupType 5 */

  /* SubRule */

  static FT_Error  Load_SubRule( TTO_SubRule*  sr,
                                 FT_Stream     stream )
  {
    FT_Error error;
    FT_Memory memory = stream->memory;

    FT_UShort               n, count;
    FT_UShort*              i;

    TTO_SubstLookupRecord*  slr;


    if ( ACCESS_Frame( 4L ) )
      return error;

    sr->GlyphCount = GET_UShort();
    sr->SubstCount = GET_UShort();

    FORGET_Frame();

    sr->Input = NULL;

    count = sr->GlyphCount - 1;         /* only GlyphCount - 1 elements */

    if ( ALLOC_ARRAY( sr->Input, count, FT_UShort ) )
      return error;

    i = sr->Input;

    if ( ACCESS_Frame( count * 2L ) )
      goto Fail2;

    for ( n = 0; n < count; n++ )
      i[n] = GET_UShort();

    FORGET_Frame();

    sr->SubstLookupRecord = NULL;

    count = sr->SubstCount;

    if ( ALLOC_ARRAY( sr->SubstLookupRecord, count, TTO_SubstLookupRecord ) )
      goto Fail2;

    slr = sr->SubstLookupRecord;

    if ( ACCESS_Frame( count * 4L ) )
      goto Fail1;

    for ( n = 0; n < count; n++ )
    {
      slr[n].SequenceIndex   = GET_UShort();
      slr[n].LookupListIndex = GET_UShort();
    }

    FORGET_Frame();

    return TT_Err_Ok;

  Fail1:
    FREE( slr );

  Fail2:
    FREE( i );
    return error;
  }


  static void  Free_SubRule( TTO_SubRule*  sr,
			     FT_Memory     memory )
  {
    FREE( sr->SubstLookupRecord );
    FREE( sr->Input );
  }


  /* SubRuleSet */

  static FT_Error  Load_SubRuleSet( TTO_SubRuleSet*  srs,
                                    FT_Stream        stream )
  {
    FT_Error error;
    FT_Memory memory = stream->memory;

    FT_UShort     n = 0, m, count;
    FT_ULong      cur_offset, new_offset, base_offset;

    TTO_SubRule*  sr;


    base_offset = FILE_Pos();

    if ( ACCESS_Frame( 2L ) )
      return error;

    count = srs->SubRuleCount = GET_UShort();

    FORGET_Frame();

    srs->SubRule = NULL;

    if ( ALLOC_ARRAY( srs->SubRule, count, TTO_SubRule ) )
      return error;

    sr = srs->SubRule;

    for ( n = 0; n < count; n++ )
    {
      if ( ACCESS_Frame( 2L ) )
        goto Fail;

      new_offset = GET_UShort() + base_offset;

      FORGET_Frame();

      cur_offset = FILE_Pos();
      if ( FILE_Seek( new_offset ) ||
           ( error = Load_SubRule( &sr[n], stream ) ) != TT_Err_Ok )
        goto Fail;
      (void)FILE_Seek( cur_offset );
    }

    return TT_Err_Ok;

  Fail:
    for ( m = 0; m < n; m++ )
      Free_SubRule( &sr[m], memory );

    FREE( sr );
    return error;
  }


  static void  Free_SubRuleSet( TTO_SubRuleSet*  srs,
				FT_Memory        memory )
  {
    FT_UShort     n, count;

    TTO_SubRule*  sr;


    if ( srs->SubRule )
    {
      count = srs->SubRuleCount;
      sr    = srs->SubRule;

      for ( n = 0; n < count; n++ )
        Free_SubRule( &sr[n], memory );

      FREE( sr );
    }
  }


  /* ContextSubstFormat1 */

  static FT_Error  Load_ContextSubst1( TTO_ContextSubstFormat1*  csf1,
                                       FT_Stream                 stream )
  {
    FT_Error error;
    FT_Memory memory = stream->memory;

    FT_UShort        n = 0, m, count;
    FT_ULong         cur_offset, new_offset, base_offset;

    TTO_SubRuleSet*  srs;


    base_offset = FILE_Pos() - 2L;

    if ( ACCESS_Frame( 2L ) )
      return error;

    new_offset = GET_UShort() + base_offset;

    FORGET_Frame();

    cur_offset = FILE_Pos();
    if ( FILE_Seek( new_offset ) ||
         ( error = Load_Coverage( &csf1->Coverage, stream ) ) != TT_Err_Ok )
      return error;
    (void)FILE_Seek( cur_offset );

    if ( ACCESS_Frame( 2L ) )
      goto Fail2;

    count = csf1->SubRuleSetCount = GET_UShort();

    FORGET_Frame();

    csf1->SubRuleSet = NULL;

    if ( ALLOC_ARRAY( csf1->SubRuleSet, count, TTO_SubRuleSet ) )
      goto Fail2;

    srs = csf1->SubRuleSet;

    for ( n = 0; n < count; n++ )
    {
      if ( ACCESS_Frame( 2L ) )
        goto Fail1;

      new_offset = GET_UShort() + base_offset;

      FORGET_Frame();

      cur_offset = FILE_Pos();
      if ( FILE_Seek( new_offset ) ||
           ( error = Load_SubRuleSet( &srs[n], stream ) ) != TT_Err_Ok )
        goto Fail1;
      (void)FILE_Seek( cur_offset );
    }

    return TT_Err_Ok;

  Fail1:
    for ( m = 0; m < n; m++ )
      Free_SubRuleSet( &srs[m], memory );

    FREE( srs );

  Fail2:
    Free_Coverage( &csf1->Coverage, memory );
    return error;
  }


  static void  Gsub_Free_Context1( TTO_ContextSubstFormat1* csf1,
			      FT_Memory                memory )
  {
    FT_UShort        n, count;

    TTO_SubRuleSet*  srs;


    if ( csf1->SubRuleSet )
    {
      count = csf1->SubRuleSetCount;
      srs   = csf1->SubRuleSet;

      for ( n = 0; n < count; n++ )
        Free_SubRuleSet( &srs[n], memory );

      FREE( srs );
    }

    Free_Coverage( &csf1->Coverage, memory );
  }


  /* SubClassRule */

  static FT_Error  Load_SubClassRule( TTO_ContextSubstFormat2*  csf2,
                                      TTO_SubClassRule*         scr,
                                      FT_Stream                 stream )
  {
    FT_Error error;
    FT_Memory memory = stream->memory;

    FT_UShort               n, count;

    FT_UShort*              c;
    TTO_SubstLookupRecord*  slr;
    FT_Bool*                d;


    if ( ACCESS_Frame( 4L ) )
      return error;

    scr->GlyphCount = GET_UShort();
    scr->SubstCount = GET_UShort();

    if ( scr->GlyphCount > csf2->MaxContextLength )
      csf2->MaxContextLength = scr->GlyphCount;

    FORGET_Frame();

    scr->Class = NULL;

    count = scr->GlyphCount - 1;        /* only GlyphCount - 1 elements */

    if ( ALLOC_ARRAY( scr->Class, count, FT_UShort ) )
      return error;

    c = scr->Class;
    d = csf2->ClassDef.Defined;

    if ( ACCESS_Frame( count * 2L ) )
      goto Fail2;

    for ( n = 0; n < count; n++ )
    {
      c[n] = GET_UShort();

      /* We check whether the specific class is used at all.  If not,
         class 0 is used instead.                                     */
      if ( !d[c[n]] )
        c[n] = 0;
    }

    FORGET_Frame();

    scr->SubstLookupRecord = NULL;

    count = scr->SubstCount;

    if ( ALLOC_ARRAY( scr->SubstLookupRecord, count, TTO_SubstLookupRecord ) )
      goto Fail2;

    slr = scr->SubstLookupRecord;

    if ( ACCESS_Frame( count * 4L ) )
      goto Fail1;

    for ( n = 0; n < count; n++ )
    {
      slr[n].SequenceIndex   = GET_UShort();
      slr[n].LookupListIndex = GET_UShort();
    }

    FORGET_Frame();

    return TT_Err_Ok;

  Fail1:
    FREE( slr );

  Fail2:
    FREE( c );
    return error;
  }


  static void  Free_SubClassRule( TTO_SubClassRule*  scr,
				  FT_Memory          memory )
  {
    FREE( scr->SubstLookupRecord );
    FREE( scr->Class );
  }


  /* SubClassSet */

  static FT_Error  Load_SubClassSet( TTO_ContextSubstFormat2*  csf2,
                                     TTO_SubClassSet*          scs,
                                     FT_Stream                 stream )
  {
    FT_Error error;
    FT_Memory memory = stream->memory;

    FT_UShort          n = 0, m, count;
    FT_ULong           cur_offset, new_offset, base_offset;

    TTO_SubClassRule*  scr;


    base_offset = FILE_Pos();

    if ( ACCESS_Frame( 2L ) )
      return error;

    count = scs->SubClassRuleCount = GET_UShort();

    FORGET_Frame();

    scs->SubClassRule = NULL;

    if ( ALLOC_ARRAY( scs->SubClassRule, count, TTO_SubClassRule ) )
      return error;

    scr = scs->SubClassRule;

    for ( n = 0; n < count; n++ )
    {
      if ( ACCESS_Frame( 2L ) )
        goto Fail;

      new_offset = GET_UShort() + base_offset;

      FORGET_Frame();

      cur_offset = FILE_Pos();
      if ( FILE_Seek( new_offset ) ||
           ( error = Load_SubClassRule( csf2, &scr[n],
                                        stream ) ) != TT_Err_Ok )
        goto Fail;
      (void)FILE_Seek( cur_offset );
    }

    return TT_Err_Ok;

  Fail:
    for ( m = 0; m < n; m++ )
      Free_SubClassRule( &scr[m], memory );

    FREE( scr );
    return error;
  }


  static void  Free_SubClassSet( TTO_SubClassSet*  scs,
				 FT_Memory         memory )
  {
    FT_UShort          n, count;

    TTO_SubClassRule*  scr;


    if ( scs->SubClassRule )
    {
      count = scs->SubClassRuleCount;
      scr   = scs->SubClassRule;

      for ( n = 0; n < count; n++ )
        Free_SubClassRule( &scr[n], memory );

      FREE( scr );
    }
  }


  /* ContextSubstFormat2 */

  static FT_Error  Load_ContextSubst2( TTO_ContextSubstFormat2*  csf2,
                                       FT_Stream                 stream )
  {
    FT_Error error;
    FT_Memory memory = stream->memory;

    FT_UShort         n = 0, m, count;
    FT_ULong          cur_offset, new_offset, base_offset;

    TTO_SubClassSet*  scs;


    base_offset = FILE_Pos() - 2;

    if ( ACCESS_Frame( 2L ) )
      return error;

    new_offset = GET_UShort() + base_offset;

    FORGET_Frame();

    cur_offset = FILE_Pos();
    if ( FILE_Seek( new_offset ) ||
         ( error = Load_Coverage( &csf2->Coverage, stream ) ) != TT_Err_Ok )
      return error;
    (void)FILE_Seek( cur_offset );

    if ( ACCESS_Frame( 4L ) )
      goto Fail3;

    new_offset = GET_UShort() + base_offset;

    /* `SubClassSetCount' is the upper limit for class values, thus we
       read it now to make an additional safety check.                 */

    count = csf2->SubClassSetCount = GET_UShort();

    FORGET_Frame();

    cur_offset = FILE_Pos();
    if ( FILE_Seek( new_offset ) ||
         ( error = Load_ClassDefinition( &csf2->ClassDef, count,
                                         stream ) ) != TT_Err_Ok )
      goto Fail3;
    (void)FILE_Seek( cur_offset );

    csf2->SubClassSet      = NULL;
    csf2->MaxContextLength = 0;

    if ( ALLOC_ARRAY( csf2->SubClassSet, count, TTO_SubClassSet ) )
      goto Fail2;

    scs = csf2->SubClassSet;

    for ( n = 0; n < count; n++ )
    {
      if ( ACCESS_Frame( 2L ) )
        goto Fail1;

      new_offset = GET_UShort() + base_offset;

      FORGET_Frame();

      if ( new_offset != base_offset )      /* not a NULL offset */
      {
        cur_offset = FILE_Pos();
        if ( FILE_Seek( new_offset ) ||
             ( error = Load_SubClassSet( csf2, &scs[n],
                                         stream ) ) != TT_Err_Ok )
          goto Fail1;
        (void)FILE_Seek( cur_offset );
      }
      else
      {
        /* we create a SubClassSet table with no entries */

        csf2->SubClassSet[n].SubClassRuleCount = 0;
        csf2->SubClassSet[n].SubClassRule      = NULL;
      }
    }

    return TT_Err_Ok;

  Fail1:
    for ( m = 0; m < n; m++ )
      Free_SubClassSet( &scs[m], memory );

    FREE( scs );

  Fail2:
    Free_ClassDefinition( &csf2->ClassDef, memory );

  Fail3:
    Free_Coverage( &csf2->Coverage, memory );
    return error;
  }


  static void  Gsub_Free_Context2( TTO_ContextSubstFormat2*  csf2,
			      FT_Memory                 memory )
  {
    FT_UShort         n, count;

    TTO_SubClassSet*  scs;


    if ( csf2->SubClassSet )
    {
      count = csf2->SubClassSetCount;
      scs   = csf2->SubClassSet;

      for ( n = 0; n < count; n++ )
        Free_SubClassSet( &scs[n], memory );

      FREE( scs );
    }

    Free_ClassDefinition( &csf2->ClassDef, memory );
    Free_Coverage( &csf2->Coverage, memory );
  }


  /* ContextSubstFormat3 */

  static FT_Error  Load_ContextSubst3( TTO_ContextSubstFormat3*  csf3,
                                       FT_Stream                 stream )
  {
    FT_Error error;
    FT_Memory memory = stream->memory;

    FT_UShort               n = 0, m, count;
    FT_ULong                cur_offset, new_offset, base_offset;

    TTO_Coverage*           c;
    TTO_SubstLookupRecord*  slr;


    base_offset = FILE_Pos() - 2L;

    if ( ACCESS_Frame( 4L ) )
      return error;

    csf3->GlyphCount = GET_UShort();
    csf3->SubstCount = GET_UShort();

    FORGET_Frame();