ftxgpos.c

RMF-1.7.153.0-NODOLBY.tar.gz 神龙卡的驱动

    new_offset = GET_UShort() + base_offset;

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

    count = cpf2->PosClassSetCount = GET_UShort();

    FORGET_Frame();

    cur_offset = FILE_Pos();
    if ( FILE_Seek( new_offset ) ||
         ( error = Load_ClassDefinition( &cpf2->ClassDef, count,
                                         input ) ) != TT_Err_Ok )
      goto Fail3;
    (void)FILE_Seek( cur_offset );

    cpf2->PosClassSet      = NULL;
    cpf2->MaxContextLength = 0;

    if ( ALLOC_ARRAY( cpf2->PosClassSet, count, TTO_PosClassSet ) )
      goto Fail2;

    pcs = cpf2->PosClassSet;

    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_PosClassSet( cpf2, &pcs[n],
                                         input ) ) != TT_Err_Ok )
          goto Fail1;
        (void)FILE_Seek( cur_offset );
      }
      else
      {
        /* we create a PosClassSet table with no entries */

        cpf2->PosClassSet[n].PosClassRuleCount = 0;
        cpf2->PosClassSet[n].PosClassRule      = NULL;
      }
    }

    return TT_Err_Ok;

  Fail1:
    for ( n = 0; n < count; n++ )
      Free_PosClassSet( &pcs[n] );

    FREE( pcs );

  Fail2:
    Free_ClassDefinition( &cpf2->ClassDef );

  Fail3:
    Free_Coverage( &cpf2->Coverage );
    return error;
  }


  static void  Free_Context2( TTO_ContextPosFormat2*  cpf2 )
  {
    UShort            n, count;

    TTO_PosClassSet*  pcs;


    if ( cpf2->PosClassSet )
    {
      count = cpf2->PosClassSetCount;
      pcs   = cpf2->PosClassSet;

      for ( n = 0; n < count; n++ )
        Free_PosClassSet( &pcs[n] );

      FREE( pcs );
    }

    Free_ClassDefinition( &cpf2->ClassDef );
    Free_Coverage( &cpf2->Coverage );
  }


  /* ContextPosFormat3 */

  static TT_Error  Load_ContextPos3( TTO_ContextPosFormat3*  cpf3,
                                     PFace                   input )
  {
    DEFINE_LOAD_LOCALS( input->stream );

    UShort                n, count;
    ULong                 cur_offset, new_offset, base_offset;

    TTO_Coverage*         c;
    TTO_PosLookupRecord*  plr;


    base_offset = FILE_Pos() - 2L;

    if ( ACCESS_Frame( 4L ) )
      return error;

    cpf3->GlyphCount = GET_UShort();
    cpf3->PosCount   = GET_UShort();

    FORGET_Frame();

    cpf3->Coverage = NULL;

    count = cpf3->GlyphCount;

    if ( ALLOC_ARRAY( cpf3->Coverage, count, TTO_Coverage ) )
      return error;

    c = cpf3->Coverage;

    for ( n = 0; n < count; n++ )
    {
      if ( ACCESS_Frame( 2L ) )
        goto Fail2;

      new_offset = GET_UShort() + base_offset;

      FORGET_Frame();

      cur_offset = FILE_Pos();
      if ( FILE_Seek( new_offset ) ||
           ( error = Load_Coverage( &c[n], input ) ) != TT_Err_Ok )
        goto Fail2;
      (void)FILE_Seek( cur_offset );
    }

    cpf3->PosLookupRecord = NULL;

    count = cpf3->PosCount;

    if ( ALLOC_ARRAY( cpf3->PosLookupRecord, count, TTO_PosLookupRecord ) )
      goto Fail2;

    plr = cpf3->PosLookupRecord;

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

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

    FORGET_Frame();

    return TT_Err_Ok;

  Fail1:
    FREE( plr );

  Fail2:
    for ( n = 0; n < count; n++ )
      Free_Coverage( &c[n] );

    FREE( c );
    return error;
  }


  static void  Free_Context3( TTO_ContextPosFormat3*  cpf3 )
  {
    UShort         n, count;

    TTO_Coverage*  c;


    FREE( cpf3->PosLookupRecord );

    if ( cpf3->Coverage )
    {
      count = cpf3->GlyphCount;
      c     = cpf3->Coverage;

      for ( n = 0; n < count; n++ )
        Free_Coverage( &c[n] );

      FREE( c );
    }
  }


  /* ContextPos */

  TT_Error  Load_ContextPos( TTO_ContextPos*  cp,
                             PFace            input )
  {
    DEFINE_LOAD_LOCALS( input->stream );


    if ( ACCESS_Frame( 2L ) )
      return error;

    cp->PosFormat = GET_UShort();

    FORGET_Frame();

    switch ( cp->PosFormat )
    {
    case 1:
      return Load_ContextPos1( &cp->cpf.cpf1, input );

    case 2:
      return Load_ContextPos2( &cp->cpf.cpf2, input );

    case 3:
      return Load_ContextPos3( &cp->cpf.cpf3, input );

    default:
      return TTO_Err_Invalid_GPOS_SubTable_Format;
    }

    return TT_Err_Ok;               /* never reached */
  }


  void  Free_ContextPos( TTO_ContextPos*  cp )
  {
    switch ( cp->PosFormat )
    {
    case 1:
      Free_Context1( &cp->cpf.cpf1 );
      break;

    case 2:
      Free_Context2( &cp->cpf.cpf2 );
      break;

    case 3:
      Free_Context3( &cp->cpf.cpf3 );
      break;
    }
  }


  /* LookupType 8 */

  /* ChainPosRule */

  static TT_Error  Load_ChainPosRule( TTO_ChainPosRule*  cpr,
                                      PFace              input )
  {
    DEFINE_LOAD_LOCALS( input->stream );

    UShort                n, count;
    UShort*               b;
    UShort*               i;
    UShort*               l;

    TTO_PosLookupRecord*  plr;


    if ( ACCESS_Frame( 2L ) )
      return error;

    cpr->BacktrackGlyphCount = GET_UShort();

    FORGET_Frame();

    cpr->Backtrack = NULL;

    count = cpr->BacktrackGlyphCount;

    if ( ALLOC_ARRAY( cpr->Backtrack, count, UShort ) )
      return error;

    b = cpr->Backtrack;

    if ( ACCESS_Frame( count * 2L ) )
      goto Fail4;

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

    FORGET_Frame();

    if ( ACCESS_Frame( 2L ) )
      goto Fail4;

    cpr->InputGlyphCount = GET_UShort();

    FORGET_Frame();

    cpr->Input = NULL;

    count = cpr->InputGlyphCount - 1;  /* only InputGlyphCount - 1 elements */

    if ( ALLOC_ARRAY( cpr->Input, count, UShort ) )
      goto Fail4;

    i = cpr->Input;

    if ( ACCESS_Frame( count * 2L ) )
      goto Fail3;

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

    FORGET_Frame();

    if ( ACCESS_Frame( 2L ) )
      goto Fail3;

    cpr->LookaheadGlyphCount = GET_UShort();

    FORGET_Frame();

    cpr->Lookahead = NULL;

    count = cpr->LookaheadGlyphCount;

    if ( ALLOC_ARRAY( cpr->Lookahead, count, UShort ) )
      goto Fail3;

    l = cpr->Lookahead;

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

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

    FORGET_Frame();

    if ( ACCESS_Frame( 2L ) )
      goto Fail2;

    cpr->PosCount = GET_UShort();

    FORGET_Frame();

    cpr->PosLookupRecord = NULL;

    count = cpr->PosCount;

    if ( ALLOC_ARRAY( cpr->PosLookupRecord, count, TTO_PosLookupRecord ) )
      goto Fail2;

    plr = cpr->PosLookupRecord;

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

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

    FORGET_Frame();

    return TT_Err_Ok;

  Fail1:
    FREE( plr );

  Fail2:
    FREE( l );

  Fail3:
    FREE( i );

  Fail4:
    FREE( b );
    return error;
  }


  static void  Free_ChainPosRule( TTO_ChainPosRule*  cpr )
  {
    FREE( cpr->PosLookupRecord );
    FREE( cpr->Lookahead );
    FREE( cpr->Input );
    FREE( cpr->Backtrack );
  }


  /* ChainPosRuleSet */

  static TT_Error  Load_ChainPosRuleSet( TTO_ChainPosRuleSet*  cprs,
                                         PFace                 input )
  {
    DEFINE_LOAD_LOCALS( input->stream );

    UShort             n, count;
    ULong              cur_offset, new_offset, base_offset;

    TTO_ChainPosRule*  cpr;


    base_offset = FILE_Pos();

    if ( ACCESS_Frame( 2L ) )
      return error;

    count = cprs->ChainPosRuleCount = GET_UShort();

    FORGET_Frame();

    cprs->ChainPosRule = NULL;

    if ( ALLOC_ARRAY( cprs->ChainPosRule, count, TTO_ChainPosRule ) )
      return error;

    cpr = cprs->ChainPosRule;

    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_ChainPosRule( &cpr[n], input ) ) != TT_Err_Ok )
        goto Fail;
      (void)FILE_Seek( cur_offset );
    }

    return TT_Err_Ok;

  Fail:
    for ( n = 0; n < count; n++ )
      Free_ChainPosRule( &cpr[n] );

    FREE( cpr );
    return error;
  }


  static void  Free_ChainPosRuleSet( TTO_ChainPosRuleSet*  cprs )
  {
    UShort             n, count;

    TTO_ChainPosRule*  cpr;


    if ( cprs->ChainPosRule )
    {
      count = cprs->ChainPosRuleCount;
      cpr   = cprs->ChainPosRule;

      for ( n = 0; n < count; n++ )
        Free_ChainPosRule( &cpr[n] );

      FREE( cpr );
    }
  }


  /* ChainContextPosFormat1 */

  static TT_Error  Load_ChainContextPos1( TTO_ChainContextPosFormat1*  ccpf1,
                                          PFace                        input )
  {
    DEFINE_LOAD_LOCALS( input->stream );

    UShort                n, count;
    ULong                 cur_offset, new_offset, base_offset;

    TTO_ChainPosRuleSet*  cprs;


    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( &ccpf1->Coverage, input ) ) != TT_Err_Ok )
      return error;
    (void)FILE_Seek( cur_offset );

    if ( ACCESS_Frame( 2L ) )
      goto Fail2;

    count = ccpf1->ChainPosRuleSetCount = GET_UShort();

    FORGET_Frame();

    ccpf1->ChainPosRuleSet = NULL;

    if ( ALLOC_ARRAY( ccpf1->ChainPosRuleSet, count, TTO_ChainPosRuleSet ) )
      goto Fail2;

    cprs = ccpf1->ChainPosRuleSet;

    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_ChainPosRuleSet( &cprs[n], input ) ) != TT_Err_Ok )
        goto Fail1;
      (void)FILE_Seek( cur_offset );
    }

    return TT_Err_Ok;

  Fail1:
    for ( n = 0; n < count; n++ )
      Free_ChainPosRuleSet( &cprs[n] );

    FREE( cprs );

  Fail2:
    Free_Coverage( &ccpf1->Coverage );
    return error;
  }


  static void  Free_ChainContext1( TTO_ChainContextPosFormat1*  ccpf1 )
  {
    UShort                n, count;

    TTO_ChainPosRuleSet*  cprs;


    if ( ccpf1->ChainPosRuleSet )
    {
      count = ccpf1->ChainPosRuleSetCount;
      cprs  = ccpf1->ChainPosRuleSet;

      for ( n = 0; n < count; n++ )
        Free_ChainPosRuleSet( &cprs[n] );

      FREE( cprs );
    }

    Free_Coverage( &ccpf1->Coverage );
  }


  /* ChainPosClassRule */

  static TT_Error  Load_ChainPosClassRule(
                     TTO_ChainContextPosFormat2*  ccpf2,
                     TTO_ChainPosClassRule*       cpcr,
                     PFace                        input )
  {
    DEFINE_LOAD_LOCALS( input->stream );

    UShort                n, count;

    UShort*               b;
    UShort*               i;
    UShort*               l;
    TTO_PosLookupRecord*  plr;
    Bool*                 d;


    if ( ACCESS_Frame( 2L ) )
      return error;

    cpcr->BacktrackGlyphCount = GET_UShort();

    FORGET_Frame();

    if ( cpcr->BacktrackGlyphCount > ccpf2->MaxBacktrackLength )
      ccpf2->MaxBacktrackLength = cpcr->BacktrackGlyphCount;

    cpcr->Backtrack = NULL;

    count = cpcr->BacktrackGlyphCount;

    if ( ALLOC_ARRAY( cpcr->Backtrack, count, UShort ) )
      return error;

    b = cpcr->Backtrack;
    d = ccpf2->BacktrackClassDef.Defined;

    if ( ACCESS_Frame( count * 2L ) )
      goto Fail4;

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

      /* We check whether the specific class is used at all.  If not,
         class 0 is used instead.                                     */

      if ( !d[b[n]] )
        b[n] = 0;
    }

    FORGET_Frame();

    if ( ACCESS