gxvalid.h File Reference

#include <ft2build.h>
#include "gxverror.h"

Include dependency graph for gxvalid.h:

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Go to the source code of this file.

Functions
FT_BEGIN_HEADER	gxv_feat_validate (FT_Bytes table, FT_Face face, FT_Validator valid)
	gxv_bsln_validate (FT_Bytes table, FT_Face face, FT_Validator valid)
	gxv_trak_validate (FT_Bytes table, FT_Face face, FT_Validator valid)
	gxv_just_validate (FT_Bytes table, FT_Face face, FT_Validator valid)
	gxv_mort_validate (FT_Bytes table, FT_Face face, FT_Validator valid)
	gxv_morx_validate (FT_Bytes table, FT_Face face, FT_Validator valid)
	gxv_kern_validate (FT_Bytes table, FT_Face face, FT_Validator valid)
	gxv_kern_validate_classic (FT_Bytes table, FT_Face face, FT_Int dialect_flags, FT_Validator valid)
	gxv_opbd_validate (FT_Bytes table, FT_Face face, FT_Validator valid)
	gxv_prop_validate (FT_Bytes table, FT_Face face, FT_Validator valid)
	gxv_lcar_validate (FT_Bytes table, FT_Face face, FT_Validator valid)

Function Documentation

gxv_bsln_validate()

gxv_bsln_validate	(	FT_Bytes	table,
		FT_Face	face,
		FT_Validator	valid
	)

Definition at line 271 of file gxvbsln.c.

  {
    GXV_ValidatorRec  gxvalidrec;
    GXV_Validator     gxvalid = &gxvalidrec;

    GXV_bsln_DataRec  bslnrec;
    GXV_bsln_Data     bsln = &bslnrec;

    FT_Bytes  p     = table;
    FT_Bytes  limit = 0;

    FT_ULong   version;
    FT_UShort  format;
    FT_UShort  defaultBaseline;

    GXV_Validate_Func  fmt_funcs_table [] =
    {
      gxv_bsln_parts_fmt0_validate,
      gxv_bsln_parts_fmt1_validate,
      gxv_bsln_parts_fmt2_validate,
      gxv_bsln_parts_fmt3_validate,
    };


    gxvalid->root       = ftvalid;
    gxvalid->table_data = bsln;
    gxvalid->face       = face;

    FT_TRACE3(( "validating `bsln' table\n" ));
    GXV_INIT;


    GXV_LIMIT_CHECK( 4 + 2 + 2 );
    version         = FT_NEXT_ULONG( p );
    format          = FT_NEXT_USHORT( p );
    defaultBaseline = FT_NEXT_USHORT( p );

    /* only version 1.0 is defined (1996) */
    if ( version != 0x00010000UL )
      FT_INVALID_FORMAT;

    /* only format 1, 2, 3 are defined (1996) */
    GXV_TRACE(( " (format = %d)\n", format ));
    if ( format > 3 )
      FT_INVALID_FORMAT;

    if ( defaultBaseline > 31 )
      FT_INVALID_FORMAT;

    bsln->defaultBaseline = defaultBaseline;

    fmt_funcs_table[format]( p, limit, gxvalid );

    FT_TRACE4(( "\n" ));
  }

gxv_feat_validate()

FT_BEGIN_HEADER gxv_feat_validate	(	FT_Bytes	table,
		FT_Face	face,
		FT_Validator	valid
	)

Definition at line 273 of file gxvfeat.c.

  {
    GXV_ValidatorRec  gxvalidrec;
    GXV_Validator     gxvalid = &gxvalidrec;

    GXV_feat_DataRec  featrec;
    GXV_feat_Data     feat = &featrec;

    FT_Bytes          p     = table;
    FT_Bytes          limit = 0;

    FT_UInt           featureNameCount;

    FT_UInt           i;
    FT_Int            last_feature;


    gxvalid->root       = ftvalid;
    gxvalid->table_data = feat;
    gxvalid->face       = face;

    FT_TRACE3(( "validating `feat' table\n" ));
    GXV_INIT;

    feat->reserved_size = 0;

    /* version + featureNameCount + none_0 + none_1  */
    GXV_LIMIT_CHECK( 4 + 2 + 2 + 4 );
    feat->reserved_size += 4 + 2 + 2 + 4;

    if ( FT_NEXT_ULONG( p ) != 0x00010000UL ) /* Version */
      FT_INVALID_FORMAT;

    featureNameCount = FT_NEXT_USHORT( p );
    GXV_TRACE(( " (featureNameCount = %d)\n", featureNameCount ));

    if ( !( IS_PARANOID_VALIDATION ) )
      p += 6; /* skip (none) and (none) */
    else
    {
      if ( FT_NEXT_USHORT( p ) != 0 )
        FT_INVALID_DATA;

      if ( FT_NEXT_ULONG( p )  != 0 )
        FT_INVALID_DATA;
    }

    feat->reserved_size += featureNameCount * ( 2 + 2 + 4 + 2 + 2 );

    for ( last_feature = -1, i = 0; i < featureNameCount; i++ )
    {
      gxv_feat_name_validate( p, limit, gxvalid );

      if ( (FT_Int)GXV_FEAT_DATA( feature ) <= last_feature )
        GXV_SET_ERR_IF_PARANOID( FT_INVALID_FORMAT );

      last_feature = GXV_FEAT_DATA( feature );
      p += 2 + 2 + 4 + 2 + 2;
    }

    FT_TRACE4(( "\n" ));
  }

gxv_just_validate()

gxv_just_validate	(	FT_Bytes	table,
		FT_Face	face,
		FT_Validator	valid
	)

Definition at line 644 of file gxvjust.c.

  {
    FT_Bytes           p     = table;
    FT_Bytes           limit = 0;

    GXV_ValidatorRec   gxvalidrec;
    GXV_Validator      gxvalid = &gxvalidrec;
    GXV_just_DataRec   justrec;
    GXV_just_Data      just = &justrec;

    FT_ULong           version;
    FT_UShort          format;
    FT_UShort          horizOffset;
    FT_UShort          vertOffset;

    GXV_ODTECT( 3, odtect );


    GXV_ODTECT_INIT( odtect );

    gxvalid->root       = ftvalid;
    gxvalid->table_data = just;
    gxvalid->face       = face;

    FT_TRACE3(( "validating `just' table\n" ));
    GXV_INIT;

    limit      = gxvalid->root->limit;

    GXV_LIMIT_CHECK( 4 + 2 + 2 + 2 );
    version     = FT_NEXT_ULONG( p );
    format      = FT_NEXT_USHORT( p );
    horizOffset = FT_NEXT_USHORT( p );
    vertOffset  = FT_NEXT_USHORT( p );
    gxv_odtect_add_range( table, (FT_ULong)( p - table ),
                          "just header", odtect );


    /* Version 1.0 (always:2000) */
    GXV_TRACE(( " (version = 0x%08x)\n", version ));
    if ( version != 0x00010000UL )
      FT_INVALID_FORMAT;

    /* format 0 (always:2000) */
    GXV_TRACE(( " (format = 0x%04x)\n", format ));
    if ( format != 0x0000 )
        FT_INVALID_FORMAT;

    GXV_TRACE(( " (horizOffset = %d)\n", horizOffset  ));
    GXV_TRACE(( " (vertOffset = %d)\n", vertOffset  ));


    /* validate justData */
    if ( 0 < horizOffset )
    {
      gxv_just_justData_validate( table + horizOffset, limit, gxvalid );
      gxv_odtect_add_range( table + horizOffset, gxvalid->subtable_length,
                            "horizJustData", odtect );
    }

    if ( 0 < vertOffset )
    {
      gxv_just_justData_validate( table + vertOffset, limit, gxvalid );
      gxv_odtect_add_range( table + vertOffset, gxvalid->subtable_length,
                            "vertJustData", odtect );
    }

    gxv_odtect_validate( odtect, gxvalid );

    FT_TRACE4(( "\n" ));
  }

gxv_kern_validate()

gxv_kern_validate	(	FT_Bytes	table,
		FT_Face	face,
		FT_Validator	valid
	)

Definition at line 898 of file gxvkern.c.

  {
    gxv_kern_validate_generic( table, face, 0, KERN_DIALECT_ANY, ftvalid );
  }

gxv_kern_validate_classic()

gxv_kern_validate_classic	(	FT_Bytes	table,
		FT_Face	face,
		FT_Int	dialect_flags,
		FT_Validator	valid
	)

Definition at line 907 of file gxvkern.c.

  {
    GXV_kern_Dialect  dialect_request;


    dialect_request = (GXV_kern_Dialect)dialect_flags;
    gxv_kern_validate_generic( table, face, 1, dialect_request, ftvalid );
  }

Referenced by classic_kern_validate().

gxv_lcar_validate()

gxv_lcar_validate	(	FT_Bytes	table,
		FT_Face	face,
		FT_Validator	valid
	)

Definition at line 183 of file gxvlcar.c.

  {
    FT_Bytes          p     = table;
    FT_Bytes          limit = 0;
    GXV_ValidatorRec  gxvalidrec;
    GXV_Validator     gxvalid = &gxvalidrec;

    GXV_lcar_DataRec  lcarrec;
    GXV_lcar_Data     lcar = &lcarrec;

    FT_Fixed          version;


    gxvalid->root       = ftvalid;
    gxvalid->table_data = lcar;
    gxvalid->face       = face;

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

    GXV_LIMIT_CHECK( 4 + 2 );
    version = FT_NEXT_LONG( p );
    GXV_LCAR_DATA( format ) = FT_NEXT_USHORT( p );

    if ( version != 0x00010000UL)
      FT_INVALID_FORMAT;

    if ( GXV_LCAR_DATA( format ) > 1 )
      FT_INVALID_FORMAT;

    gxvalid->lookupval_sign   = GXV_LOOKUPVALUE_UNSIGNED;
    gxvalid->lookupval_func   = gxv_lcar_LookupValue_validate;
    gxvalid->lookupfmt4_trans = gxv_lcar_LookupFmt4_transit;
    gxv_LookupTable_validate( p, limit, gxvalid );

    FT_TRACE4(( "\n" ));
  }

gxv_mort_validate()

gxv_mort_validate	(	FT_Bytes	table,
		FT_Face	face,
		FT_Validator	valid
	)

Definition at line 261 of file gxvmort.c.

  {
    GXV_ValidatorRec  gxvalidrec;
    GXV_Validator     gxvalid = &gxvalidrec;
    FT_Bytes          p     = table;
    FT_Bytes          limit = 0;
    FT_ULong          version;
    FT_ULong          nChains;
    FT_ULong          i;


    gxvalid->root = ftvalid;
    gxvalid->face = face;
    limit         = gxvalid->root->limit;

    FT_TRACE3(( "validating `mort' table\n" ));
    GXV_INIT;

    GXV_LIMIT_CHECK( 4 + 4 );
    version = FT_NEXT_ULONG( p );
    nChains = FT_NEXT_ULONG( p );

    if (version != 0x00010000UL)
      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_mort_chain_validate( p, limit, gxvalid );
      p += gxvalid->subtable_length;
    }

    FT_TRACE4(( "\n" ));
  }

gxv_morx_validate()

gxv_morx_validate	(	FT_Bytes	table,
		FT_Face	face,
		FT_Validator	valid
	)

Definition at line 161 of file gxvmorx.c.

  {
    GXV_ValidatorRec  gxvalidrec;
    GXV_Validator     gxvalid = &gxvalidrec;
    FT_Bytes          p     = table;
    FT_Bytes          limit = 0;
    FT_ULong          version;
    FT_ULong          nChains;
    FT_ULong          i;


    gxvalid->root = ftvalid;
    gxvalid->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, gxvalid );
      p += gxvalid->subtable_length;
    }

    FT_TRACE4(( "\n" ));
  }

gxv_opbd_validate()

gxv_opbd_validate	(	FT_Bytes	table,
		FT_Face	face,
		FT_Validator	valid
	)

Definition at line 162 of file gxvopbd.c.

  {
    GXV_ValidatorRec  gxvalidrec;
    GXV_Validator     gxvalid = &gxvalidrec;
    GXV_opbd_DataRec  opbdrec;
    GXV_opbd_Data     opbd  = &opbdrec;
    FT_Bytes          p     = table;
    FT_Bytes          limit = 0;

    FT_ULong  version;


    gxvalid->root       = ftvalid;
    gxvalid->table_data = opbd;
    gxvalid->face       = face;

    FT_TRACE3(( "validating `opbd' table\n" ));
    GXV_INIT;
    GXV_OPBD_DATA( valueOffset_min ) = 0xFFFFU;


    GXV_LIMIT_CHECK( 4 + 2 );
    version                 = FT_NEXT_ULONG( p );
    GXV_OPBD_DATA( format ) = FT_NEXT_USHORT( p );


    /* only 0x00010000 is defined (1996) */
    GXV_TRACE(( "(version=0x%08x)\n", version ));
    if ( 0x00010000UL != version )
      FT_INVALID_FORMAT;

    /* only values 0 and 1 are defined (1996) */
    GXV_TRACE(( "(format=0x%04x)\n", GXV_OPBD_DATA( format ) ));
    if ( 0x0001 < GXV_OPBD_DATA( format ) )
      FT_INVALID_FORMAT;

    gxvalid->lookupval_sign   = GXV_LOOKUPVALUE_UNSIGNED;
    gxvalid->lookupval_func   = gxv_opbd_LookupValue_validate;
    gxvalid->lookupfmt4_trans = gxv_opbd_LookupFmt4_transit;

    gxv_LookupTable_validate( p, limit, gxvalid );
    p += gxvalid->subtable_length;

    if ( p > table + GXV_OPBD_DATA( valueOffset_min ) )
    {
      GXV_TRACE((
        "found overlap between LookupTable and opbd_value array\n" ));
      FT_INVALID_OFFSET;
    }

    FT_TRACE4(( "\n" ));
  }

gxv_prop_validate()

gxv_prop_validate	(	FT_Bytes	table,
		FT_Face	face,
		FT_Validator	valid
	)

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_trak_validate()

gxv_trak_validate	(	FT_Bytes	table,
		FT_Face	face,
		FT_Validator	valid
	)

Definition at line 208 of file gxvtrak.c.

  {
    FT_Bytes          p = table;
    FT_Bytes          limit = 0;

    GXV_ValidatorRec  gxvalidrec;
    GXV_Validator     gxvalid = &gxvalidrec;
    GXV_trak_DataRec  trakrec;
    GXV_trak_Data     trak = &trakrec;

    FT_ULong   version;
    FT_UShort  format;
    FT_UShort  horizOffset;
    FT_UShort  vertOffset;
    FT_UShort  reserved;


    GXV_ODTECT( 3, odtect );

    GXV_ODTECT_INIT( odtect );
    gxvalid->root       = ftvalid;
    gxvalid->table_data = trak;
    gxvalid->face       = face;

    limit      = gxvalid->root->limit;

    FT_TRACE3(( "validating `trak' table\n" ));
    GXV_INIT;

    GXV_LIMIT_CHECK( 4 + 2 + 2 + 2 + 2 );
    version     = FT_NEXT_ULONG( p );
    format      = FT_NEXT_USHORT( p );
    horizOffset = FT_NEXT_USHORT( p );
    vertOffset  = FT_NEXT_USHORT( p );
    reserved    = FT_NEXT_USHORT( p );

    GXV_TRACE(( " (version = 0x%08x)\n", version ));
    GXV_TRACE(( " (format = 0x%04x)\n", format ));
    GXV_TRACE(( " (horizOffset = 0x%04x)\n", horizOffset ));
    GXV_TRACE(( " (vertOffset = 0x%04x)\n", vertOffset ));
    GXV_TRACE(( " (reserved = 0x%04x)\n", reserved ));

    /* Version 1.0 (always:1996) */
    if ( version != 0x00010000UL )
      FT_INVALID_FORMAT;

    /* format 0 (always:1996) */
    if ( format != 0x0000 )
      FT_INVALID_FORMAT;

    GXV_32BIT_ALIGNMENT_VALIDATE( horizOffset );
    GXV_32BIT_ALIGNMENT_VALIDATE( vertOffset );

    /* Reserved Fixed Value (always) */
    if ( reserved != 0x0000 )
      FT_INVALID_DATA;

    /* validate trackData */
    if ( 0 < horizOffset )
    {
      gxv_trak_trackData_validate( table + horizOffset, limit, gxvalid );
      gxv_odtect_add_range( table + horizOffset, gxvalid->subtable_length,
                            "horizJustData", odtect );
    }

    if ( 0 < vertOffset )
    {
      gxv_trak_trackData_validate( table + vertOffset, limit, gxvalid );
      gxv_odtect_add_range( table + vertOffset, gxvalid->subtable_length,
                            "vertJustData", odtect );
    }

    gxv_odtect_validate( odtect, gxvalid );

    FT_TRACE4(( "\n" ));
  }