gxvprop.c File Reference

#include "gxvalid.h"
#include "gxvcommn.h"

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Classes
struct	GXV_prop_DataRec_

Macros
#define	FT_COMPONENT   trace_gxvprop
#define	GXV_PROP_HEADER_SIZE   ( 4 + 2 + 2 )
#define	GXV_PROP_SIZE_MIN   GXV_PROP_HEADER_SIZE
#define	GXV_PROP_DATA(field)   GXV_TABLE_DATA( prop, field )
#define	GXV_PROP_FLOATER   0x8000U
#define	GXV_PROP_USE_COMPLEMENTARY_BRACKET   0x1000U
#define	GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET   0x0F00U
#define	GXV_PROP_ATTACHING_TO_RIGHT   0x0080U
#define	GXV_PROP_RESERVED   0x0060U
#define	GXV_PROP_DIRECTIONALITY_CLASS   0x001FU

Typedefs
typedef struct GXV_prop_DataRec_	GXV_prop_DataRec
typedef struct GXV_prop_DataRec_ *	GXV_prop_Data

Functions
static void	gxv_prop_zero_advance_validate (FT_UShort gid, GXV_Validator gxvalid)
static void	gxv_prop_property_validate (FT_UShort property, FT_UShort glyph, GXV_Validator gxvalid)
static void	gxv_prop_LookupValue_validate (FT_UShort glyph, GXV_LookupValueCPtr value_p, GXV_Validator gxvalid)
static GXV_LookupValueDesc	gxv_prop_LookupFmt4_transit (FT_UShort relative_gindex, GXV_LookupValueCPtr base_value_p, FT_Bytes lookuptbl_limit, GXV_Validator gxvalid)
	gxv_prop_validate (FT_Bytes table, FT_Face face, FT_Validator ftvalid)

Macro Definition Documentation

FT_COMPONENT

#define FT_COMPONENT   trace_gxvprop

Definition at line 39 of file gxvprop.c.

GXV_PROP_ATTACHING_TO_RIGHT

#define GXV_PROP_ATTACHING_TO_RIGHT   0x0080U

Definition at line 64 of file gxvprop.c.

GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET

#define GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET   0x0F00U

Definition at line 63 of file gxvprop.c.

GXV_PROP_DATA

#define GXV_PROP_DATA

(

field

)

GXV_TABLE_DATA( prop, field )

Definition at line 59 of file gxvprop.c.

GXV_PROP_DIRECTIONALITY_CLASS

#define GXV_PROP_DIRECTIONALITY_CLASS   0x001FU

Definition at line 66 of file gxvprop.c.

GXV_PROP_FLOATER

#define GXV_PROP_FLOATER   0x8000U

Definition at line 61 of file gxvprop.c.

GXV_PROP_HEADER_SIZE

#define GXV_PROP_HEADER_SIZE   ( 4 + 2 + 2 )

Definition at line 50 of file gxvprop.c.

GXV_PROP_RESERVED

#define GXV_PROP_RESERVED   0x0060U

Definition at line 65 of file gxvprop.c.

GXV_PROP_SIZE_MIN

#define GXV_PROP_SIZE_MIN   GXV_PROP_HEADER_SIZE

Definition at line 51 of file gxvprop.c.

GXV_PROP_USE_COMPLEMENTARY_BRACKET

#define GXV_PROP_USE_COMPLEMENTARY_BRACKET   0x1000U

Definition at line 62 of file gxvprop.c.

Typedef Documentation

GXV_prop_Data

typedef struct GXV_prop_DataRec_ * GXV_prop_Data

GXV_prop_DataRec

typedef struct GXV_prop_DataRec_ GXV_prop_DataRec

Function Documentation

gxv_prop_LookupFmt4_transit()

static GXV_LookupValueDesc gxv_prop_LookupFmt4_transit ( FT_UShort  relative_gindex, GXV_LookupValueCPtr  base_value_p, FT_Bytes  lookuptbl_limit, GXV_Validator  gxvalid  )

static

Definition at line 225 of file gxvprop.c.

  {
    FT_Bytes             p;
    FT_Bytes             limit;
    FT_UShort            offset;
    GXV_LookupValueDesc  value;
 
    /* XXX: check range? */
    offset = (FT_UShort)( base_value_p->u +
                          relative_gindex * sizeof ( FT_UShort ) );
    p      = gxvalid->lookuptbl_head + offset;
    limit  = lookuptbl_limit;
 
    GXV_LIMIT_CHECK ( 2 );
    value.u = FT_NEXT_USHORT( p );
 
    return value;
  }

Referenced by gxv_prop_validate().

gxv_prop_LookupValue_validate()

static void gxv_prop_LookupValue_validate ( FT_UShort  glyph, GXV_LookupValueCPtr  value_p, GXV_Validator  gxvalid  )

static

Definition at line 189 of file gxvprop.c.

  {
    gxv_prop_property_validate( value_p->u, glyph, gxvalid );
  }

Referenced by gxv_prop_validate().

gxv_prop_property_validate()

static void gxv_prop_property_validate ( FT_UShort  property, FT_UShort  glyph, GXV_Validator  gxvalid  )

static

Definition at line 111 of file gxvprop.c.

  {
    if ( glyph != 0 && ( property & GXV_PROP_FLOATER ) )
      gxv_prop_zero_advance_validate( glyph, gxvalid );
 
    if ( property & GXV_PROP_USE_COMPLEMENTARY_BRACKET )
    {
      FT_UShort  offset;
      char       complement;
 
 
      offset = (FT_UShort)( property & GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET );
      if ( offset == 0 )
      {
        GXV_TRACE(( "  found zero offset to property\n" ));
        FT_INVALID_OFFSET;
      }
 
      complement = (char)( offset >> 8 );
      if ( complement & 0x08 )
      {
        /* Top bit is set: negative */
 
        /* Calculate the absolute offset */
        complement = (char)( ( complement & 0x07 ) + 1 );
 
        /* The gid for complement must be greater than 0 */
        if ( glyph <= complement )
        {
          GXV_TRACE(( "  found non-positive glyph complement\n" ));
          FT_INVALID_DATA;
        }
      }
      else
      {
        /* The gid for complement must be the face. */
        gxv_glyphid_validate( (FT_UShort)( glyph + complement ), gxvalid );
      }
    }
    else
    {
      if ( property & GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET )
        GXV_TRACE(( "glyph %d cannot have complementary bracketing\n",
                    glyph ));
    }
 
    /* this is introduced in version 2.0 */
    if ( property & GXV_PROP_ATTACHING_TO_RIGHT )
    {
      if ( GXV_PROP_DATA( version ) == 0x00010000UL )
      {
        GXV_TRACE(( "  found older version (1.0) in new version table\n" ));
        FT_INVALID_DATA;
      }
    }
 
    if ( property & GXV_PROP_RESERVED )
    {
      GXV_TRACE(( "  found non-zero bits in reserved bits\n" ));
      FT_INVALID_DATA;
    }
 
    if ( ( property & GXV_PROP_DIRECTIONALITY_CLASS ) > 11 )
    {
      /* TODO: Too restricted. Use the validation level. */
      if ( GXV_PROP_DATA( version ) == 0x00010000UL ||
           GXV_PROP_DATA( version ) == 0x00020000UL )
      {
        GXV_TRACE(( "  found too old version in directionality class\n" ));
        FT_INVALID_DATA;
      }
    }
  }

Referenced by gxv_prop_LookupValue_validate(), and gxv_prop_validate().

gxv_prop_validate()

gxv_prop_validate	(	FT_Bytes	table,
		FT_Face	face,
		FT_Validator	ftvalid
	)

Definition at line 257 of file gxvprop.c.

  {
    FT_Bytes          p     = table;
    FT_Bytes          limit = 0;
    GXV_ValidatorRec  gxvalidrec;
    GXV_Validator     gxvalid = &gxvalidrec;
 
    GXV_prop_DataRec  proprec;
    GXV_prop_Data     prop = &proprec;
 
    FT_Fixed          version;
    FT_UShort         format;
    FT_UShort         defaultProp;
 
 
    gxvalid->root       = ftvalid;
    gxvalid->table_data = prop;
    gxvalid->face       = face;
 
    FT_TRACE3(( "validating `prop' table\n" ));
    GXV_INIT;
 
    GXV_LIMIT_CHECK( 4 + 2 + 2 );
    version     = FT_NEXT_LONG( p );
    format      = FT_NEXT_USHORT( p );
    defaultProp = FT_NEXT_USHORT( p );
 
    GXV_TRACE(( "  version 0x%08x\n", version ));
    GXV_TRACE(( "  format  0x%04x\n", format ));
    GXV_TRACE(( "  defaultProp  0x%04x\n", defaultProp ));
 
    /* only versions 1.0, 2.0, 3.0 are defined (1996) */
    if ( version != 0x00010000UL &&
         version != 0x00020000UL &&
         version != 0x00030000UL )
    {
      GXV_TRACE(( "  found unknown version\n" ));
      FT_INVALID_FORMAT;
    }
 
 
    /* only formats 0x0000, 0x0001 are defined (1996) */
    if ( format > 1 )
    {
      GXV_TRACE(( "  found unknown format\n" ));
      FT_INVALID_FORMAT;
    }
 
    gxv_prop_property_validate( defaultProp, 0, gxvalid );
 
    if ( format == 0 )
    {
      FT_TRACE3(( "(format 0, no per-glyph properties, "
                  "remaining %d bytes are skipped)", limit - p ));
      goto Exit;
    }
 
    /* format == 1 */
    GXV_PROP_DATA( version ) = version;
 
    gxvalid->lookupval_sign   = GXV_LOOKUPVALUE_UNSIGNED;
    gxvalid->lookupval_func   = gxv_prop_LookupValue_validate;
    gxvalid->lookupfmt4_trans = gxv_prop_LookupFmt4_transit;
 
    gxv_LookupTable_validate( p, limit, gxvalid );
 
  Exit:
    FT_TRACE4(( "\n" ));
  }

gxv_prop_zero_advance_validate()

static void gxv_prop_zero_advance_validate ( FT_UShort  gid, GXV_Validator  gxvalid  )

static

Definition at line 78 of file gxvprop.c.

  {
    FT_Face       face;
    FT_Error      error;
    FT_GlyphSlot  glyph;
 
 
    GXV_NAME_ENTER( "zero advance" );
 
    face = gxvalid->face;
 
    error = FT_Load_Glyph( face,
                           gid,
                           FT_LOAD_IGNORE_TRANSFORM );
    if ( error )
      FT_INVALID_GLYPH_ID;
 
    glyph = face->glyph;
 
    if ( glyph->advance.x != (FT_Pos)0 ||
         glyph->advance.y != (FT_Pos)0 )
    {
      GXV_TRACE(( "  found non-zero advance in zero-advance glyph\n" ));
      FT_INVALID_DATA;
    }
 
    GXV_EXIT;
  }

Referenced by gxv_prop_property_validate().