/***************************************************************************/

/*                                                                         */

/*  gxvlcar.c                                                              */

/*                                                                         */

/*    TrueTypeGX/AAT lcar table validation (body).                         */

/*                                                                         */

/*  Copyright 2004, 2005 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 "gxvalid.h"

#include "gxvcommn.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_gxvlcar

  /*************************************************************************/

  /*************************************************************************/

  /*****                                                               *****/

  /*****                      Data and Types                           *****/

  /*****                                                               *****/

  /*************************************************************************/

  /*************************************************************************/

  typedef struct  GXV_lcar_DataRec_

  {

    FT_UShort  format;

  } GXV_lcar_DataRec, *GXV_lcar_Data;

#define GXV_LCAR_DATA( FIELD )  GXV_TABLE_DATA( lcar, FIELD )

  /*************************************************************************/

  /*************************************************************************/

  /*****                                                               *****/

  /*****                      UTILITY FUNCTIONS                        *****/

  /*****                                                               *****/

  /*************************************************************************/

  /*************************************************************************/

  static void

  gxv_lcar_partial_validate( FT_UShort      partial,

                             FT_UShort      glyph,

                             GXV_Validator  valid )

  {

    GXV_NAME_ENTER( "partial" );

    if ( GXV_LCAR_DATA( format ) != 1 )

      goto Exit;

    gxv_ctlPoint_validate( glyph, partial, valid );

  Exit:

    GXV_EXIT;

  }

  static void

  gxv_lcar_LookupValue_validate( FT_UShort            glyph,

                                 GXV_LookupValueCPtr  value_p,

                                 GXV_Validator        valid )

  {

    FT_Bytes   p     = valid->root->base + value_p->u;

    FT_Bytes   limit = valid->root->limit;

    FT_UShort  count;

    FT_Short   partial;

    FT_UShort  i;

    GXV_NAME_ENTER( "element in lookupTable" );

    GXV_LIMIT_CHECK( 2 );

    count = FT_NEXT_USHORT( p );

    GXV_LIMIT_CHECK( 2 * count );

    for ( i = 0; i < count; i++ )

    {

      partial = FT_NEXT_SHORT( p );

      gxv_lcar_partial_validate( partial, glyph, valid );

    }

    GXV_EXIT;

  }

  /*

    +------ lcar --------------------+

    |                                |

    |      +===============+         |

    |      | looup header  |         |

    |      +===============+         |

    |      | BinSrchHeader |         |

    |      +===============+         |

    |      | lastGlyph[0]  |         |

    |      +---------------+         |

    |      | firstGlyph[0] |         |  head of lcar sfnt table

    |      +---------------+         |             +

    |      | offset[0]     |    ->   |          offset            [byte]

    |      +===============+         |             +

    |      | lastGlyph[1]  |         | (glyphID - firstGlyph) * 2 [byte]

    |      +---------------+         |

    |      | firstGlyph[1] |         |

    |      +---------------+         |

    |      | offset[1]     |         |

    |      +===============+         |

    |                                |

    |       ....                     |

    |                                |

    |      16bit value array         |

    |      +===============+         |

    +------|     value     | <-------+

    |       ....

    |

    |

    |

    |

    |

    +---->  lcar values...handled by lcar callback function

  */

  static GXV_LookupValueDesc

  gxv_lcar_LookupFmt4_transit( FT_UShort            relative_gindex,

                               GXV_LookupValueCPtr  base_value_p,

                               FT_Bytes             lookuptbl_limit,

                               GXV_Validator        valid )

  {

    FT_Bytes             p;

    FT_Bytes             limit;

    FT_UShort            offset;

    GXV_LookupValueDesc  value;

    FT_UNUSED( lookuptbl_limit );

    /* XXX: check range? */

    offset = (FT_UShort)( base_value_p->u +

                          relative_gindex * sizeof ( FT_UShort ) );

    p      = valid->root->base + offset;

    limit  = valid->root->limit;

    GXV_LIMIT_CHECK ( 2 );

    value.u = FT_NEXT_USHORT( p );

    return value;

  }

  /*************************************************************************/

  /*************************************************************************/

  /*****                                                               *****/

  /*****                          lcar TABLE                           *****/

  /*****                                                               *****/

  /*************************************************************************/

  /*************************************************************************/

  FT_LOCAL_DEF( void )

  gxv_lcar_validate( FT_Bytes      table,

                     FT_Face       face,

                     FT_Validator  ftvalid )

  {

    FT_Bytes          p     = table;

    FT_Bytes          limit = 0;

    GXV_ValidatorRec  validrec;

    GXV_Validator     valid = &validrec;

    GXV_lcar_DataRec  lcarrec;

    GXV_lcar_Data     lcar = &lcarrec;

    FT_Fixed          version;

    valid->root       = ftvalid;

    valid->table_data = lcar;

    valid->face       = face;

    FT_TRACE3(( "validating `lcar' table\n" ));

    GXV_INIT;

    GXV_LIMIT_CHECK( 4 + 2 );

    version = FT_NEXT_ULONG( p );

    GXV_LCAR_DATA( format ) = FT_NEXT_USHORT( p );

    if ( version != 0x00010000UL)

      FT_INVALID_FORMAT;

    if ( GXV_LCAR_DATA( format ) > 1 )

      FT_INVALID_FORMAT;

    valid->lookupval_sign   = GXV_LOOKUPVALUE_UNSIGNED;

    valid->lookupval_func   = gxv_lcar_LookupValue_validate;

    valid->lookupfmt4_trans = gxv_lcar_LookupFmt4_transit;

    gxv_LookupTable_validate( p, limit, valid );

    FT_TRACE4(( "\n" ));

  }

/* END */