misc/libfreetype/src/gxvalid/gxvopbd.c
author Mitchell Kember <mk12360@gmail.com>
Fri, 30 Nov 2012 15:29:09 -0500 (2012-11-30)
changeset 8147 53190e590919
parent 5172 88f2e05288ba
permissions -rw-r--r--
Use same macro for hiding video record button and keybinding Modified my previous patch to use the already-in-place VIDEOREC macro (used previously just for hiding the button on the main menu) instead of creating another one. https://google-melange.appspot.com/gci/task/view/google/gci2012/7948213
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/***************************************************************************/
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/*                                                                         */
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/*  gxvopbd.c                                                              */
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/*                                                                         */
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/*    TrueTypeGX/AAT opbd table validation (body).                         */
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/*                                                                         */
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/*  Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
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/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
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/*                                                                         */
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/*  This file is part of the FreeType project, and may only be used,       */
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/*  modified, and distributed under the terms of the FreeType project      */
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/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
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/*  this file you indicate that you have read the license and              */
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/*  understand and accept it fully.                                        */
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/*                                                                         */
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/***************************************************************************/
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/***************************************************************************/
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/*                                                                         */
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/* gxvalid is derived from both gxlayout module and otvalid module.        */
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/* Development of gxlayout is supported by the Information-technology      */
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/* Promotion Agency(IPA), Japan.                                           */
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/*                                                                         */
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/***************************************************************************/
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#include "gxvalid.h"
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#include "gxvcommn.h"
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  /*************************************************************************/
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  /*                                                                       */
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  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
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  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
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  /* messages during execution.                                            */
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  /*                                                                       */
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#undef  FT_COMPONENT
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#define FT_COMPONENT  trace_gxvopbd
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  /*************************************************************************/
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  /*************************************************************************/
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  /*****                                                               *****/
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  /*****                      Data and Types                           *****/
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  /*****                                                               *****/
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  /*************************************************************************/
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  /*************************************************************************/
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  typedef struct  GXV_opbd_DataRec_
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  {
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    FT_UShort  format;
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    FT_UShort  valueOffset_min;
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  } GXV_opbd_DataRec, *GXV_opbd_Data;
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#define GXV_OPBD_DATA( FIELD )  GXV_TABLE_DATA( opbd, FIELD )
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  /*************************************************************************/
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  /*************************************************************************/
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  /*****                                                               *****/
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  /*****                      UTILITY FUNCTIONS                        *****/
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  /*****                                                               *****/
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  /*************************************************************************/
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  /*************************************************************************/
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  static void
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  gxv_opbd_LookupValue_validate( FT_UShort            glyph,
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                                 GXV_LookupValueCPtr  value_p,
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                                 GXV_Validator        valid )
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  {
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    /* offset in LookupTable is measured from the head of opbd table */
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    FT_Bytes   p     = valid->root->base + value_p->u;
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    FT_Bytes   limit = valid->root->limit;
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    FT_Short   delta_value;
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    int        i;
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    if ( value_p->u < GXV_OPBD_DATA( valueOffset_min ) )
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      GXV_OPBD_DATA( valueOffset_min ) = value_p->u;
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    for ( i = 0; i < 4; i++ )
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    {
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      GXV_LIMIT_CHECK( 2 );
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      delta_value = FT_NEXT_SHORT( p );
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      if ( GXV_OPBD_DATA( format ) )    /* format 1, value is ctrl pt. */
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      {
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        if ( delta_value == -1 )
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          continue;
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        gxv_ctlPoint_validate( glyph, delta_value, valid );
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      }
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      else                              /* format 0, value is distance */
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        continue;
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    }
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  }
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  /*
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    opbd ---------------------+
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                              |
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    +===============+         |
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    | lookup header |         |
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    +===============+         |
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    | BinSrchHeader |         |
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    +===============+         |
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    | lastGlyph[0]  |         |
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    +---------------+         |
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    | firstGlyph[0] |         |  head of opbd sfnt table
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    +---------------+         |             +
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    | offset[0]     |    ->   |          offset            [byte]
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    +===============+         |             +
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    | lastGlyph[1]  |         | (glyphID - firstGlyph) * 4 * sizeof(FT_Short) [byte]
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    +---------------+         |
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    | firstGlyph[1] |         |
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    +---------------+         |
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    | offset[1]     |         |
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    +===============+         |
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                              |
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     ....                     |
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                              |
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    48bit value array         |
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    +===============+         |
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    |     value     | <-------+
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    |               |
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    |               |
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    |               |
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    +---------------+
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    .... */
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  static GXV_LookupValueDesc
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  gxv_opbd_LookupFmt4_transit( FT_UShort            relative_gindex,
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                               GXV_LookupValueCPtr  base_value_p,
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                               FT_Bytes             lookuptbl_limit,
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                               GXV_Validator        valid )
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  {
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    GXV_LookupValueDesc  value;
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    FT_UNUSED( lookuptbl_limit );
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    FT_UNUSED( valid );
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    /* XXX: check range? */
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    value.u = (FT_UShort)( base_value_p->u +
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                           relative_gindex * 4 * sizeof ( FT_Short ) );
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    return value;
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  }
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  /*************************************************************************/
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  /*************************************************************************/
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  /*****                                                               *****/
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  /*****                         opbd TABLE                            *****/
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  /*****                                                               *****/
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  /*************************************************************************/
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  /*************************************************************************/
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  FT_LOCAL_DEF( void )
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  gxv_opbd_validate( FT_Bytes      table,
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                     FT_Face       face,
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                     FT_Validator  ftvalid )
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  {
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    GXV_ValidatorRec  validrec;
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    GXV_Validator     valid = &validrec;
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    GXV_opbd_DataRec  opbdrec;
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    GXV_opbd_Data     opbd  = &opbdrec;
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    FT_Bytes          p     = table;
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    FT_Bytes          limit = 0;
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    FT_ULong  version;
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    valid->root       = ftvalid;
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    valid->table_data = opbd;
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    valid->face       = face;
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    FT_TRACE3(( "validating `opbd' table\n" ));
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    GXV_INIT;
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    GXV_OPBD_DATA( valueOffset_min ) = 0xFFFFU;
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    GXV_LIMIT_CHECK( 4 + 2 );
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    version                 = FT_NEXT_ULONG( p );
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    GXV_OPBD_DATA( format ) = FT_NEXT_USHORT( p );
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    /* only 0x00010000 is defined (1996) */
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    GXV_TRACE(( "(version=0x%08x)\n", version ));
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    if ( 0x00010000UL != version )
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      FT_INVALID_FORMAT;
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    /* only values 0 and 1 are defined (1996) */
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    GXV_TRACE(( "(format=0x%04x)\n", GXV_OPBD_DATA( format ) ));
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    if ( 0x0001 < GXV_OPBD_DATA( format ) )
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      FT_INVALID_FORMAT;
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    valid->lookupval_sign   = GXV_LOOKUPVALUE_UNSIGNED;
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    valid->lookupval_func   = gxv_opbd_LookupValue_validate;
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    valid->lookupfmt4_trans = gxv_opbd_LookupFmt4_transit;
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    gxv_LookupTable_validate( p, limit, valid );
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    p += valid->subtable_length;
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    if ( p > table + GXV_OPBD_DATA( valueOffset_min ) )
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    {
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      GXV_TRACE((
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        "found overlap between LookupTable and opbd_value array\n" ));
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      FT_INVALID_OFFSET;
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    }
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    FT_TRACE4(( "\n" ));
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  }
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/* END */