gxvmorx5.c

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/***************************************************************************/
/*                                                                         */
/*  gxvmorx5.c                                                             */
/*                                                                         */
/*    TrueTypeGX/AAT morx table validation                                 */
/*    body for type5 (Contextual Glyph Insertion) subtable.                */
/*                                                                         */
/*  Copyright 2005, 2007 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/

/***************************************************************************/
/*                                                                         */
/* gxvalid is derived from both gxlayout module and otvalid module.        */
/* Development of gxlayout is supported by the Information-technology      */
/* Promotion Agency(IPA), Japan.                                           */
/*                                                                         */
/***************************************************************************/


#include "gxvmorx.h"


  /*************************************************************************/
  /*                                                                       */
  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  /* messages during execution.                                            */
  /*                                                                       */
#undef  FT_COMPONENT
#define FT_COMPONENT  trace_gxvmorx


  /*
   * `morx' subtable type5 (Contextual Glyph Insertion)
   * has format of a StateTable with insertion-glyph-list
   * without name.  However, the 32bit offset from the head
   * of subtable to the i-g-l is given after `entryTable',
   * without variable name specification (the existence of
   * this offset to the table is different from mort type5).
   */


  typedef struct  GXV_morx_subtable_type5_StateOptRec_
  {
    FT_ULong  insertionGlyphList;
    FT_ULong  insertionGlyphList_length;

  }  GXV_morx_subtable_type5_StateOptRec,
    *GXV_morx_subtable_type5_StateOptRecData;


#define GXV_MORX_SUBTABLE_TYPE5_HEADER_SIZE \
          ( GXV_STATETABLE_HEADER_SIZE + 4 )


  static void
  gxv_morx_subtable_type5_insertionGlyphList_load( FT_Bytes       table,
                                                   FT_Bytes       limit,
                                                   GXV_Validator  valid )
  {
    FT_Bytes  p = table;

    GXV_morx_subtable_type5_StateOptRecData  optdata =
      (GXV_morx_subtable_type5_StateOptRecData)valid->xstatetable.optdata;


    GXV_LIMIT_CHECK( 4 );
    optdata->insertionGlyphList = FT_NEXT_ULONG( p );
  }


  static void
  gxv_morx_subtable_type5_subtable_setup( FT_ULong       table_size,
                                          FT_ULong       classTable,
                                          FT_ULong       stateArray,
                                          FT_ULong       entryTable,
                                          FT_ULong*      classTable_length_p,
                                          FT_ULong*      stateArray_length_p,
                                          FT_ULong*      entryTable_length_p,
                                          GXV_Validator  valid )
  {
    FT_ULong   o[4];
    FT_ULong*  l[4];
    FT_ULong   buff[5];

    GXV_morx_subtable_type5_StateOptRecData  optdata =
      (GXV_morx_subtable_type5_StateOptRecData)valid->xstatetable.optdata;


    o[0] = classTable;
    o[1] = stateArray;
    o[2] = entryTable;
    o[3] = optdata->insertionGlyphList;
    l[0] = classTable_length_p;
    l[1] = stateArray_length_p;
    l[2] = entryTable_length_p;
    l[3] = &(optdata->insertionGlyphList_length);

    gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, valid );
  }


  static void
  gxv_morx_subtable_type5_InsertList_validate( FT_UShort      table_index,
                                               FT_UShort      count,
                                               FT_Bytes       table,
                                               FT_Bytes       limit,
                                               GXV_Validator  valid )
  {
    FT_Bytes p = table + table_index * 2;


    while ( p < table + count * 2 + table_index * 2 )
    {
      FT_UShort  insert_glyphID;


      GXV_LIMIT_CHECK( 2 );
      insert_glyphID = FT_NEXT_USHORT( p );
      GXV_TRACE(( " 0x%04x", insert_glyphID ));
    }

    GXV_TRACE(( "\n" ));
  }


  static void
  gxv_morx_subtable_type5_entry_validate(
    FT_UShort                       state,
    FT_UShort                       flags,
    GXV_StateTable_GlyphOffsetCPtr  glyphOffset_p,
    FT_Bytes                        table,
    FT_Bytes                        limit,
    GXV_Validator                   valid )
  {
    FT_Bool    setMark;
    FT_Bool    dontAdvance;
    FT_Bool    currentIsKashidaLike;
    FT_Bool    markedIsKashidaLike;
    FT_Bool    currentInsertBefore;
    FT_Bool    markedInsertBefore;
    FT_Byte    currentInsertCount;
    FT_Byte    markedInsertCount;
    FT_Byte    currentInsertList;
    FT_UShort  markedInsertList;

    FT_UNUSED( state );


    setMark              = FT_BOOL( ( flags >> 15 ) & 1 );
    dontAdvance          = FT_BOOL( ( flags >> 14 ) & 1 );
    currentIsKashidaLike = FT_BOOL( ( flags >> 13 ) & 1 );
    markedIsKashidaLike  = FT_BOOL( ( flags >> 12 ) & 1 );
    currentInsertBefore  = FT_BOOL( ( flags >> 11 ) & 1 );
    markedInsertBefore   = FT_BOOL( ( flags >> 10 ) & 1 );

    currentInsertCount = (FT_Byte)( ( flags >> 5 ) & 0x1F   );
    markedInsertCount  = (FT_Byte)(   flags        & 0x001F );

    currentInsertList = (FT_Byte)  ( glyphOffset_p->ul >> 16 );
    markedInsertList  = (FT_UShort)( glyphOffset_p->ul       );

    if ( currentInsertList && 0 != currentInsertCount )
      gxv_morx_subtable_type5_InsertList_validate( currentInsertList,
                                                   currentInsertCount,
                                                   table, limit,
                                                   valid );

    if ( markedInsertList && 0 != markedInsertCount )
      gxv_morx_subtable_type5_InsertList_validate( markedInsertList,
                                                   markedInsertCount,
                                                   table, limit,
                                                   valid );
  }


  FT_LOCAL_DEF( void )
  gxv_morx_subtable_type5_validate( FT_Bytes       table,
                                    FT_Bytes       limit,
                                    GXV_Validator  valid )
  {
    FT_Bytes  p = table;

    GXV_morx_subtable_type5_StateOptRec      et_rec;
    GXV_morx_subtable_type5_StateOptRecData  et = &et_rec;


    GXV_NAME_ENTER( "morx chain subtable type5 (Glyph Insertion)" );

    GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE5_HEADER_SIZE );

    valid->xstatetable.optdata =
      et;
    valid->xstatetable.optdata_load_func =
      gxv_morx_subtable_type5_insertionGlyphList_load;
    valid->xstatetable.subtable_setup_func =
      gxv_morx_subtable_type5_subtable_setup;
    valid->xstatetable.entry_glyphoffset_fmt =
      GXV_GLYPHOFFSET_ULONG;
    valid->xstatetable.entry_validate_func =
      gxv_morx_subtable_type5_entry_validate;

    gxv_XStateTable_validate( p, limit, valid );

    GXV_EXIT;
  }


/* END */