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

/*                                                                         */

/*  gxvmorx.c                                                              */

/*                                                                         */

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

/*                                                                         */

/*  Copyright 2005, 2008 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

  static void

  gxv_morx_subtables_validate( FT_Bytes       table,

                               FT_Bytes       limit,

                               FT_UShort      nSubtables,

                               GXV_Validator  valid )

  {

    FT_Bytes  p = table;

    GXV_Validate_Func fmt_funcs_table[] =

    {

      gxv_morx_subtable_type0_validate, /* 0 */

      gxv_morx_subtable_type1_validate, /* 1 */

      gxv_morx_subtable_type2_validate, /* 2 */

      NULL,                             /* 3 */

      gxv_morx_subtable_type4_validate, /* 4 */

      gxv_morx_subtable_type5_validate, /* 5 */

    };

    GXV_Validate_Func  func;

    FT_UShort  i;

    GXV_NAME_ENTER( "subtables in a chain" );

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

    {

      FT_ULong  length;

      FT_ULong  coverage;

      FT_ULong  subFeatureFlags;

      FT_ULong  type;

      FT_ULong  rest;

      GXV_LIMIT_CHECK( 4 + 4 + 4 );

      length          = FT_NEXT_ULONG( p );

      coverage        = FT_NEXT_ULONG( p );

      subFeatureFlags = FT_NEXT_ULONG( p );

      GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n",

                  i + 1, nSubtables, length ));

      type = coverage & 0x0007;

      rest = length - ( 4 + 4 + 4 );

      GXV_LIMIT_CHECK( rest );

      /* morx coverage consists of mort_coverage & 16bit padding */

      gxv_mort_coverage_validate( (FT_UShort)( ( coverage >> 16 ) | coverage ),

                                  valid );

      if ( type > 5 )

        FT_INVALID_FORMAT;

      func = fmt_funcs_table[type];

      if ( func == NULL )

        GXV_TRACE(( "morx type %d is reserved\n", type ));

      func( p, p + rest, valid );

      p += rest;

    }

    valid->subtable_length = p - table;

    GXV_EXIT;

  }

  static void

  gxv_morx_chain_validate( FT_Bytes       table,

                           FT_Bytes       limit,

                           GXV_Validator  valid )

  {

    FT_Bytes  p = table;

    FT_ULong  defaultFlags;

    FT_ULong  chainLength;

    FT_ULong  nFeatureFlags;

    FT_ULong  nSubtables;

    GXV_NAME_ENTER( "morx chain header" );

    GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 );

    defaultFlags  = FT_NEXT_ULONG( p );

    chainLength   = FT_NEXT_ULONG( p );

    nFeatureFlags = FT_NEXT_ULONG( p );

    nSubtables    = FT_NEXT_ULONG( p );

    /* feature-array of morx is same with that of mort */

    gxv_mort_featurearray_validate( p, limit, nFeatureFlags, valid );

    p += valid->subtable_length;

    if ( nSubtables >= 0x10000L )

      FT_INVALID_DATA;

    gxv_morx_subtables_validate( p, table + chainLength,

                                 (FT_UShort)nSubtables, valid );

    valid->subtable_length = chainLength;

    GXV_EXIT;

  }

  FT_LOCAL_DEF( void )

  gxv_morx_validate( FT_Bytes      table,

                     FT_Face       face,

                     FT_Validator  ftvalid )

  {

    GXV_ValidatorRec  validrec;

    GXV_Validator     valid = &validrec;

    FT_Bytes          p     = table;

    FT_Bytes          limit = 0;

    FT_ULong          version;

    FT_ULong          nChains;

    FT_ULong          i;

    valid->root = ftvalid;

    valid->face = face;

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

    GXV_INIT;

    GXV_LIMIT_CHECK( 4 + 4 );

    version = FT_NEXT_ULONG( p );

    nChains = FT_NEXT_ULONG( p );

    if ( version != 0x00020000UL )

      FT_INVALID_FORMAT;

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

    {

      GXV_TRACE(( "validating chain %d/%d\n", i + 1, nChains ));

      GXV_32BIT_ALIGNMENT_VALIDATE( p - table );

      gxv_morx_chain_validate( p, limit, valid );

      p += valid->subtable_length;

    }

    FT_TRACE4(( "\n" ));

  }

/* END */