otvgsub.c File Reference

#include "otvalid.h"
#include "otvcommn.h"

Include dependency graph for otvgsub.c:

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Go to the source code of this file.

Macros
#define	FT_COMPONENT   trace_otvgsub
#define	LigatureFunc   otv_Ligature_validate

Functions
static void	otv_SingleSubst_validate (FT_Bytes table, OTV_Validator otvalid)
static void	otv_MultipleSubst_validate (FT_Bytes table, OTV_Validator otvalid)
static void	otv_AlternateSubst_validate (FT_Bytes table, OTV_Validator otvalid)
static void	otv_Ligature_validate (FT_Bytes table, OTV_Validator otvalid)
static void	otv_LigatureSubst_validate (FT_Bytes table, OTV_Validator otvalid)
static void	otv_ContextSubst_validate (FT_Bytes table, OTV_Validator otvalid)
static void	otv_ChainContextSubst_validate (FT_Bytes table, OTV_Validator otvalid)
static void	otv_ExtensionSubst_validate (FT_Bytes table, OTV_Validator otvalid)
static void	otv_ReverseChainSingleSubst_validate (FT_Bytes table, OTV_Validator otvalid)
	otv_GSUB_validate (FT_Bytes table, FT_UInt glyph_count, FT_Validator ftvalid)

Variables
static const OTV_Validate_Func	otv_gsub_validate_funcs [8]

Macro Definition Documentation

FT_COMPONENT

#define FT_COMPONENT   trace_otvgsub

Definition at line 30 of file otvgsub.c.

LigatureFunc

#define LigatureFunc   otv_Ligature_validate

Definition at line 205 of file otvgsub.c.

Function Documentation

otv_AlternateSubst_validate()

static void otv_AlternateSubst_validate ( FT_Bytes  table, OTV_Validator  otvalid  )

static

Definition at line 167 of file otvgsub.c.

  {
    FT_Bytes  p = table;
    FT_UInt   SubstFormat;
 
 
    OTV_NAME_ENTER( "AlternateSubst" );
 
    OTV_LIMIT_CHECK( 2 );
    SubstFormat = FT_NEXT_USHORT( p );
 
    OTV_TRACE(( " (format %d)\n", SubstFormat ));
 
    switch ( SubstFormat )
    {
    case 1:
      otvalid->extra1 = otvalid->glyph_count;
      OTV_NEST2( AlternateSubstFormat1, AlternateSet );
      OTV_RUN( table, otvalid );
      break;
 
    default:
      FT_INVALID_FORMAT;
    }
 
    OTV_EXIT;
  }

otv_ChainContextSubst_validate()

static void otv_ChainContextSubst_validate ( FT_Bytes  table, OTV_Validator  otvalid  )

static

Definition at line 341 of file otvgsub.c.

  {
    FT_Bytes  p = table;
    FT_UInt   SubstFormat;
 
 
    OTV_NAME_ENTER( "ChainContextSubst" );
 
    OTV_LIMIT_CHECK( 2 );
    SubstFormat = FT_NEXT_USHORT( p );
 
    OTV_TRACE(( " (format %d)\n", SubstFormat ));
 
    switch ( SubstFormat )
    {
    case 1:
      /* no need to check glyph indices/classes used as input for these */
      /* context rules since even invalid glyph indices/classes return  */
      /* meaningful results                                             */
 
      otvalid->extra1 = otvalid->lookup_count;
      OTV_NEST3( ChainContextSubstFormat1,
                 ChainSubRuleSet, ChainSubRule );
      OTV_RUN( table, otvalid );
      break;
 
    case 2:
      /* no need to check glyph indices/classes used as input for these */
      /* context rules since even invalid glyph indices/classes return  */
      /* meaningful results                                             */
 
      OTV_NEST3( ChainContextSubstFormat2,
                 ChainSubClassSet, ChainSubClassRule );
      OTV_RUN( table, otvalid );
      break;
 
    case 3:
      OTV_NEST1( ChainContextSubstFormat3 );
      OTV_RUN( table, otvalid );
      break;
 
    default:
      FT_INVALID_FORMAT;
    }
 
    OTV_EXIT;
  }

otv_ContextSubst_validate()

static void otv_ContextSubst_validate ( FT_Bytes  table, OTV_Validator  otvalid  )

static

Definition at line 282 of file otvgsub.c.

  {
    FT_Bytes  p = table;
    FT_UInt   SubstFormat;
 
 
    OTV_NAME_ENTER( "ContextSubst" );
 
    OTV_LIMIT_CHECK( 2 );
    SubstFormat = FT_NEXT_USHORT( p );
 
    OTV_TRACE(( " (format %d)\n", SubstFormat ));
 
    switch ( SubstFormat )
    {
    case 1:
      /* no need to check glyph indices/classes used as input for these */
      /* context rules since even invalid glyph indices/classes return  */
      /* meaningful results                                             */
 
      otvalid->extra1 = otvalid->lookup_count;
      OTV_NEST3( ContextSubstFormat1, SubRuleSet, SubRule );
      OTV_RUN( table, otvalid );
      break;
 
    case 2:
      /* no need to check glyph indices/classes used as input for these */
      /* context rules since even invalid glyph indices/classes return  */
      /* meaningful results                                             */
 
      OTV_NEST3( ContextSubstFormat2, SubClassSet, SubClassRule );
      OTV_RUN( table, otvalid );
      break;
 
    case 3:
      OTV_NEST1( ContextSubstFormat3 );
      OTV_RUN( table, otvalid );
      break;
 
    default:
      FT_INVALID_FORMAT;
    }
 
    OTV_EXIT;
  }

otv_ExtensionSubst_validate()

static void otv_ExtensionSubst_validate ( FT_Bytes  table, OTV_Validator  otvalid  )

static

Definition at line 402 of file otvgsub.c.

  {
    FT_Bytes  p = table;
    FT_UInt   SubstFormat;
 
 
    OTV_NAME_ENTER( "ExtensionSubst" );
 
    OTV_LIMIT_CHECK( 2 );
    SubstFormat = FT_NEXT_USHORT( p );
 
    OTV_TRACE(( " (format %d)\n", SubstFormat ));
 
    switch ( SubstFormat )
    {
    case 1:     /* ExtensionSubstFormat1 */
      {
        FT_UInt            ExtensionLookupType;
        FT_ULong           ExtensionOffset;
        OTV_Validate_Func  validate;
 
 
        OTV_LIMIT_CHECK( 6 );
        ExtensionLookupType = FT_NEXT_USHORT( p );
        ExtensionOffset     = FT_NEXT_ULONG( p );
 
        if ( ExtensionLookupType == 0 ||
             ExtensionLookupType == 7 ||
             ExtensionLookupType > 8  )
          FT_INVALID_DATA;
 
        validate = otvalid->type_funcs[ExtensionLookupType - 1];
        validate( table + ExtensionOffset, otvalid );
      }
      break;
 
    default:
      FT_INVALID_FORMAT;
    }
 
    OTV_EXIT;
  }

otv_GSUB_validate()

otv_GSUB_validate	(	FT_Bytes	table,
		FT_UInt	glyph_count,
		FT_Validator	ftvalid
	)

Definition at line 548 of file otvgsub.c.

  {
    OTV_ValidatorRec  otvalidrec;
    OTV_Validator     otvalid = &otvalidrec;
    FT_Bytes          p       = table;
    FT_UInt           table_size;
    FT_UShort         version;
    FT_UInt           ScriptList, FeatureList, LookupList;
 
    OTV_OPTIONAL_TABLE32( featureVariations );
 
 
    otvalid->root = ftvalid;
 
    FT_TRACE3(( "validating GSUB table\n" ));
    OTV_INIT;
 
    OTV_LIMIT_CHECK( 4 );
 
    if ( FT_NEXT_USHORT( p ) != 1 )  /* majorVersion */
      FT_INVALID_FORMAT;
 
    version = FT_NEXT_USHORT( p );   /* minorVersion */
 
    table_size = 10;
    switch ( version )
    {
    case 0:
      OTV_LIMIT_CHECK( 6 );
      break;
 
    case 1:
      OTV_LIMIT_CHECK( 10 );
      table_size += 4;
      break;
 
    default:
      FT_INVALID_FORMAT;
    }
 
    ScriptList  = FT_NEXT_USHORT( p );
    FeatureList = FT_NEXT_USHORT( p );
    LookupList  = FT_NEXT_USHORT( p );
 
    otvalid->type_count  = 8;
    otvalid->type_funcs  = (OTV_Validate_Func*)otv_gsub_validate_funcs;
    otvalid->glyph_count = glyph_count;
 
    otv_LookupList_validate( table + LookupList,
                             otvalid );
    otv_FeatureList_validate( table + FeatureList, table + LookupList,
                              otvalid );
    otv_ScriptList_validate( table + ScriptList, table + FeatureList,
                             otvalid );
 
    if ( version > 0 )
    {
      OTV_OPTIONAL_OFFSET32( featureVariations );
      OTV_SIZE_CHECK32( featureVariations );
      if ( featureVariations )
        OTV_TRACE(( "  [omitting featureVariations validation]\n" )); /* XXX */
    }
 
    FT_TRACE4(( "\n" ));
  }

Referenced by otv_validate().

otv_Ligature_validate()

static void otv_Ligature_validate ( FT_Bytes  table, OTV_Validator  otvalid  )

static

Definition at line 210 of file otvgsub.c.

  {
    FT_Bytes  p = table;
    FT_UInt   LigatureGlyph, CompCount;
 
 
    OTV_ENTER;
 
    OTV_LIMIT_CHECK( 4 );
    LigatureGlyph = FT_NEXT_USHORT( p );
    if ( LigatureGlyph >= otvalid->glyph_count )
      FT_INVALID_DATA;
 
    CompCount = FT_NEXT_USHORT( p );
 
    OTV_TRACE(( " (CompCount = %d)\n", CompCount ));
 
    if ( CompCount == 0 )
      FT_INVALID_DATA;
 
    CompCount--;
 
    OTV_LIMIT_CHECK( CompCount * 2 );     /* Component */
 
    /* no need to check the Component glyph indices */
 
    OTV_EXIT;
  }

otv_LigatureSubst_validate()

static void otv_LigatureSubst_validate ( FT_Bytes  table, OTV_Validator  otvalid  )

static

Definition at line 242 of file otvgsub.c.

  {
    FT_Bytes  p = table;
    FT_UInt   SubstFormat;
 
 
    OTV_NAME_ENTER( "LigatureSubst" );
 
    OTV_LIMIT_CHECK( 2 );
    SubstFormat = FT_NEXT_USHORT( p );
 
    OTV_TRACE(( " (format %d)\n", SubstFormat ));
 
    switch ( SubstFormat )
    {
    case 1:
      OTV_NEST3( LigatureSubstFormat1, LigatureSet, Ligature );
      OTV_RUN( table, otvalid );
      break;
 
    default:
      FT_INVALID_FORMAT;
    }
 
    OTV_EXIT;
  }

otv_MultipleSubst_validate()

static void otv_MultipleSubst_validate ( FT_Bytes  table, OTV_Validator  otvalid  )

static

Definition at line 126 of file otvgsub.c.

  {
    FT_Bytes  p = table;
    FT_UInt   SubstFormat;
 
 
    OTV_NAME_ENTER( "MultipleSubst" );
 
    OTV_LIMIT_CHECK( 2 );
    SubstFormat = FT_NEXT_USHORT( p );
 
    OTV_TRACE(( " (format %d)\n", SubstFormat ));
 
    switch ( SubstFormat )
    {
    case 1:
      otvalid->extra1 = otvalid->glyph_count;
      OTV_NEST2( MultipleSubstFormat1, Sequence );
      OTV_RUN( table, otvalid );
      break;
 
    default:
      FT_INVALID_FORMAT;
    }
 
    OTV_EXIT;
  }

otv_ReverseChainSingleSubst_validate()

static void otv_ReverseChainSingleSubst_validate ( FT_Bytes  table, OTV_Validator  otvalid  )

static

Definition at line 458 of file otvgsub.c.

  {
    FT_Bytes  p = table, Coverage;
    FT_UInt   SubstFormat;
    FT_UInt   BacktrackGlyphCount, LookaheadGlyphCount, GlyphCount;
 
 
    OTV_NAME_ENTER( "ReverseChainSingleSubst" );
 
    OTV_LIMIT_CHECK( 2 );
    SubstFormat = FT_NEXT_USHORT( p );
 
    OTV_TRACE(( " (format %d)\n", SubstFormat ));
 
    switch ( SubstFormat )
    {
    case 1:     /* ReverseChainSingleSubstFormat1 */
      OTV_LIMIT_CHECK( 4 );
      Coverage            = table + FT_NEXT_USHORT( p );
      BacktrackGlyphCount = FT_NEXT_USHORT( p );
 
      OTV_TRACE(( " (BacktrackGlyphCount = %d)\n", BacktrackGlyphCount ));
 
      otv_Coverage_validate( Coverage, otvalid, -1 );
 
      OTV_LIMIT_CHECK( BacktrackGlyphCount * 2 + 2 );
 
      for ( ; BacktrackGlyphCount > 0; BacktrackGlyphCount-- )
        otv_Coverage_validate( table + FT_NEXT_USHORT( p ), otvalid, -1 );
 
      LookaheadGlyphCount = FT_NEXT_USHORT( p );
 
      OTV_TRACE(( " (LookaheadGlyphCount = %d)\n", LookaheadGlyphCount ));
 
      OTV_LIMIT_CHECK( LookaheadGlyphCount * 2 + 2 );
 
      for ( ; LookaheadGlyphCount > 0; LookaheadGlyphCount-- )
        otv_Coverage_validate( table + FT_NEXT_USHORT( p ), otvalid, -1 );
 
      GlyphCount = FT_NEXT_USHORT( p );
 
      OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
 
      if ( GlyphCount != otv_Coverage_get_count( Coverage ) )
        FT_INVALID_DATA;
 
      OTV_LIMIT_CHECK( GlyphCount * 2 );
 
      /* Substitute */
      for ( ; GlyphCount > 0; GlyphCount-- )
        if ( FT_NEXT_USHORT( p ) >= otvalid->glyph_count )
          FT_INVALID_DATA;
 
      break;
 
    default:
      FT_INVALID_FORMAT;
    }
 
    OTV_EXIT;
  }

otv_SingleSubst_validate()

static void otv_SingleSubst_validate ( FT_Bytes  table, OTV_Validator  otvalid  )

static

Definition at line 44 of file otvgsub.c.

  {
    FT_Bytes  p = table;
    FT_UInt   SubstFormat;
 
 
    OTV_NAME_ENTER( "SingleSubst" );
 
    OTV_LIMIT_CHECK( 2 );
    SubstFormat = FT_NEXT_USHORT( p );
 
    OTV_TRACE(( " (format %d)\n", SubstFormat ));
 
    switch ( SubstFormat )
    {
    case 1:     /* SingleSubstFormat1 */
      {
        FT_Bytes  Coverage;
        FT_Int    DeltaGlyphID;
        FT_Long   idx;
 
 
        OTV_LIMIT_CHECK( 4 );
        Coverage     = table + FT_NEXT_USHORT( p );
        DeltaGlyphID = FT_NEXT_SHORT( p );
 
        otv_Coverage_validate( Coverage, otvalid, -1 );
 
        idx = (FT_Long)otv_Coverage_get_first( Coverage ) + DeltaGlyphID;
        if ( idx < 0 )
          FT_INVALID_DATA;
 
        idx = (FT_Long)otv_Coverage_get_last( Coverage ) + DeltaGlyphID;
        if ( (FT_UInt)idx >= otvalid->glyph_count )
          FT_INVALID_DATA;
      }
      break;
 
    case 2:     /* SingleSubstFormat2 */
      {
        FT_UInt  Coverage, GlyphCount;
 
 
        OTV_LIMIT_CHECK( 4 );
        Coverage   = FT_NEXT_USHORT( p );
        GlyphCount = FT_NEXT_USHORT( p );
 
        OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
 
        otv_Coverage_validate( table + Coverage,
                               otvalid,
                               (FT_Int)GlyphCount );
 
        OTV_LIMIT_CHECK( GlyphCount * 2 );
 
        /* Substitute */
        for ( ; GlyphCount > 0; GlyphCount-- )
          if ( FT_NEXT_USHORT( p ) >= otvalid->glyph_count )
            FT_INVALID_GLYPH_ID;
      }
      break;
 
    default:
      FT_INVALID_FORMAT;
    }
 
    OTV_EXIT;
  }

Variable Documentation

otv_gsub_validate_funcs

const OTV_Validate_Func otv_gsub_validate_funcs[8]

static

Initial value:

=
  {
    otv_SingleSubst_validate,
    otv_MultipleSubst_validate,
    otv_AlternateSubst_validate,
    otv_LigatureSubst_validate,
    otv_ContextSubst_validate,
    otv_ChainContextSubst_validate,
    otv_ExtensionSubst_validate,
    otv_ReverseChainSingleSubst_validate
  }

Definition at line 522 of file otvgsub.c.

Referenced by otv_GSUB_validate().