gxvkern.c File Reference

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

Include dependency graph for gxvkern.c:

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Go to the source code of this file.

Classes
struct	GXV_kern_DataRec_
struct	GXV_kern_fmt1_StateOptRec_
struct	GXV_kern_subtable_fmt2_DataRec_

Macros
#define	FT_COMPONENT   trace_gxvkern
#define	GXV_KERN_DATA(field)   GXV_TABLE_DATA( kern, field )
#define	KERN_IS_CLASSIC(gxvalid)    ( KERN_VERSION_CLASSIC == GXV_KERN_DATA( version ) )
#define	KERN_IS_NEW(gxvalid)    ( KERN_VERSION_NEW == GXV_KERN_DATA( version ) )
#define	KERN_DIALECT(gxvalid)    GXV_KERN_DATA( dialect_request )
#define	KERN_ALLOWS_MS(gxvalid)    ( KERN_DIALECT( gxvalid ) & KERN_DIALECT_MS )
#define	KERN_ALLOWS_APPLE(gxvalid)    ( KERN_DIALECT( gxvalid ) & KERN_DIALECT_APPLE )
#define	GXV_KERN_HEADER_SIZE   ( KERN_IS_NEW( gxvalid ) ? 8 : 4 )
#define	GXV_KERN_SUBTABLE_HEADER_SIZE   ( KERN_IS_NEW( gxvalid ) ? 8 : 6 )
#define	GXV_KERN_FMT2_DATA(field)

Typedefs
typedef enum GXV_kern_Version_	GXV_kern_Version
typedef enum GXV_kern_Dialect_	GXV_kern_Dialect
typedef struct GXV_kern_DataRec_	GXV_kern_DataRec
typedef struct GXV_kern_DataRec_ *	GXV_kern_Data
typedef struct GXV_kern_fmt1_StateOptRec_	GXV_kern_fmt1_StateOptRec
typedef struct GXV_kern_fmt1_StateOptRec_ *	GXV_kern_fmt1_StateOptRecData
typedef enum GXV_kern_ClassSpec_	GXV_kern_ClassSpec
typedef struct GXV_kern_subtable_fmt2_DataRec_	GXV_kern_subtable_fmt2_DataRec
typedef struct GXV_kern_subtable_fmt2_DataRec_ *	GXV_kern_subtable_fmt2_Data

Enumerations
enum	GXV_kern_Version_ { KERN_VERSION_CLASSIC = 0x0000 , KERN_VERSION_NEW = 0x0001 }
enum	GXV_kern_Dialect_ { KERN_DIALECT_UNKNOWN = 0 , KERN_DIALECT_MS = FT_VALIDATE_MS , KERN_DIALECT_APPLE = FT_VALIDATE_APPLE , KERN_DIALECT_ANY = FT_VALIDATE_CKERN }
enum	GXV_kern_ClassSpec_ { GXV_KERN_CLS_L = 0 , GXV_KERN_CLS_R }

Functions
static void	gxv_kern_subtable_fmt0_pairs_validate (FT_Bytes table, FT_Bytes limit, FT_UShort nPairs, GXV_Validator gxvalid)
static void	gxv_kern_subtable_fmt0_validate (FT_Bytes table, FT_Bytes limit, GXV_Validator gxvalid)
static void	gxv_kern_subtable_fmt1_valueTable_load (FT_Bytes table, FT_Bytes limit, GXV_Validator gxvalid)
static void	gxv_kern_subtable_fmt1_subtable_setup (FT_UShort table_size, FT_UShort classTable, FT_UShort stateArray, FT_UShort entryTable, FT_UShort *classTable_length_p, FT_UShort *stateArray_length_p, FT_UShort *entryTable_length_p, GXV_Validator gxvalid)
static void	gxv_kern_subtable_fmt1_entry_validate (FT_Byte state, FT_UShort flags, GXV_StateTable_GlyphOffsetCPtr glyphOffset_p, FT_Bytes table, FT_Bytes limit, GXV_Validator gxvalid)
static void	gxv_kern_subtable_fmt1_validate (FT_Bytes table, FT_Bytes limit, GXV_Validator gxvalid)
static void	gxv_kern_subtable_fmt2_clstbl_validate (FT_Bytes table, FT_Bytes limit, GXV_kern_ClassSpec spec, GXV_Validator gxvalid)
static void	gxv_kern_subtable_fmt2_validate (FT_Bytes table, FT_Bytes limit, GXV_Validator gxvalid)
static void	gxv_kern_subtable_fmt3_validate (FT_Bytes table, FT_Bytes limit, GXV_Validator gxvalid)
static FT_Bool	gxv_kern_coverage_new_apple_validate (FT_UShort coverage, FT_UShort *format, GXV_Validator gxvalid)
static FT_Bool	gxv_kern_coverage_classic_apple_validate (FT_UShort coverage, FT_UShort *format, GXV_Validator gxvalid)
static FT_Bool	gxv_kern_coverage_classic_microsoft_validate (FT_UShort coverage, FT_UShort *format, GXV_Validator gxvalid)
static GXV_kern_Dialect	gxv_kern_coverage_validate (FT_UShort coverage, FT_UShort *format, GXV_Validator gxvalid)
static void	gxv_kern_subtable_validate (FT_Bytes table, FT_Bytes limit, GXV_Validator gxvalid)
static void	gxv_kern_validate_generic (FT_Bytes table, FT_Face face, FT_Bool classic_only, GXV_kern_Dialect dialect_request, FT_Validator ftvalid)
	gxv_kern_validate (FT_Bytes table, FT_Face face, FT_Validator ftvalid)
	gxv_kern_validate_classic (FT_Bytes table, FT_Face face, FT_Int dialect_flags, FT_Validator ftvalid)

Macro Definition Documentation

FT_COMPONENT

#define FT_COMPONENT   trace_gxvkern

Definition at line 42 of file gxvkern.c.

GXV_KERN_DATA

#define GXV_KERN_DATA

(

field

)

GXV_TABLE_DATA( kern, field )

Definition at line 80 of file gxvkern.c.

GXV_KERN_FMT2_DATA

#define GXV_KERN_FMT2_DATA

(

field

)

Value:

        ( ( (GXV_kern_subtable_fmt2_DataRec *)              \
              ( GXV_KERN_DATA( subtable_data ) ) )->field )

Definition at line 365 of file gxvkern.c.

GXV_KERN_HEADER_SIZE

#define GXV_KERN_HEADER_SIZE   ( KERN_IS_NEW( gxvalid ) ? 8 : 4 )

Definition at line 94 of file gxvkern.c.

GXV_KERN_SUBTABLE_HEADER_SIZE

#define GXV_KERN_SUBTABLE_HEADER_SIZE   ( KERN_IS_NEW( gxvalid ) ? 8 : 6 )

Definition at line 95 of file gxvkern.c.

KERN_ALLOWS_APPLE

#define KERN_ALLOWS_APPLE

(

gxvalid

)

( KERN_DIALECT( gxvalid ) & KERN_DIALECT_APPLE )

Definition at line 91 of file gxvkern.c.

KERN_ALLOWS_MS

#define KERN_ALLOWS_MS

(

gxvalid

)

( KERN_DIALECT( gxvalid ) & KERN_DIALECT_MS )

Definition at line 89 of file gxvkern.c.

KERN_DIALECT

#define KERN_DIALECT

(

gxvalid

)

GXV_KERN_DATA( dialect_request )

Definition at line 87 of file gxvkern.c.

KERN_IS_CLASSIC

#define KERN_IS_CLASSIC

(

gxvalid

)

( KERN_VERSION_CLASSIC == GXV_KERN_DATA( version ) )

Definition at line 82 of file gxvkern.c.

KERN_IS_NEW

#define KERN_IS_NEW

(

gxvalid

)

( KERN_VERSION_NEW == GXV_KERN_DATA( version ) )

Definition at line 84 of file gxvkern.c.

Typedef Documentation

GXV_kern_ClassSpec

typedef enum GXV_kern_ClassSpec_ GXV_kern_ClassSpec

GXV_kern_Data

typedef struct GXV_kern_DataRec_ * GXV_kern_Data

GXV_kern_DataRec

typedef struct GXV_kern_DataRec_ GXV_kern_DataRec

GXV_kern_Dialect

typedef enum GXV_kern_Dialect_ GXV_kern_Dialect

GXV_kern_fmt1_StateOptRec

typedef struct GXV_kern_fmt1_StateOptRec_ GXV_kern_fmt1_StateOptRec

GXV_kern_fmt1_StateOptRecData

typedef struct GXV_kern_fmt1_StateOptRec_ * GXV_kern_fmt1_StateOptRecData

GXV_kern_subtable_fmt2_Data

typedef struct GXV_kern_subtable_fmt2_DataRec_ * GXV_kern_subtable_fmt2_Data

GXV_kern_subtable_fmt2_DataRec

typedef struct GXV_kern_subtable_fmt2_DataRec_ GXV_kern_subtable_fmt2_DataRec

GXV_kern_Version

typedef enum GXV_kern_Version_ GXV_kern_Version

Enumeration Type Documentation

GXV_kern_ClassSpec_

enum GXV_kern_ClassSpec_

Enumerator
GXV_KERN_CLS_L
GXV_KERN_CLS_R

Definition at line 341 of file gxvkern.c.

  {
    GXV_KERN_CLS_L = 0,
    GXV_KERN_CLS_R
 
  } GXV_kern_ClassSpec;

GXV_kern_Dialect_

enum GXV_kern_Dialect_

Enumerator
KERN_DIALECT_UNKNOWN
KERN_DIALECT_MS
KERN_DIALECT_APPLE
KERN_DIALECT_ANY

Definition at line 61 of file gxvkern.c.

  {
    KERN_DIALECT_UNKNOWN = 0,
    KERN_DIALECT_MS      = FT_VALIDATE_MS,
    KERN_DIALECT_APPLE   = FT_VALIDATE_APPLE,
    KERN_DIALECT_ANY     = FT_VALIDATE_CKERN
 
  } GXV_kern_Dialect;

GXV_kern_Version_

enum GXV_kern_Version_

Enumerator
KERN_VERSION_CLASSIC
KERN_VERSION_NEW

Definition at line 53 of file gxvkern.c.

  {
    KERN_VERSION_CLASSIC = 0x0000,
    KERN_VERSION_NEW     = 0x0001
 
  } GXV_kern_Version;

Function Documentation

gxv_kern_coverage_classic_apple_validate()

static FT_Bool gxv_kern_coverage_classic_apple_validate ( FT_UShort  coverage, FT_UShort *  format, GXV_Validator  gxvalid  )

static

Definition at line 596 of file gxvkern.c.

  {
    /* classic Apple-dialect */
#ifdef GXV_LOAD_TRACE_VARS
    FT_Bool  horizontal;
    FT_Bool  cross_stream;
#endif
 
 
    /* check expected flags, but don't check if MS-dialect is impossible */
    if ( !( coverage & 0xFD00 ) && KERN_ALLOWS_MS( gxvalid ) )
      return FALSE;
 
    /* reserved bits = 0 */
    if ( coverage & 0x02FC )
      return FALSE;
 
#ifdef GXV_LOAD_TRACE_VARS
    horizontal   = FT_BOOL( ( coverage >> 15 ) & 1 );
    cross_stream = FT_BOOL( ( coverage >> 13 ) & 1 );
#endif
 
    *format = (FT_UShort)( coverage & 0x0003 );
 
    GXV_TRACE(( "classic Apple-dialect: "
                "horizontal=%d, cross-stream=%d, format=%d\n",
                 horizontal, cross_stream, *format ));
 
    /* format 1 requires GX State Machine, too new for classic */
    if ( *format == 1 )
      return FALSE;
 
    GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" ));
 
    return TRUE;
  }

Referenced by gxv_kern_coverage_validate().

gxv_kern_coverage_classic_microsoft_validate()

static FT_Bool gxv_kern_coverage_classic_microsoft_validate ( FT_UShort  coverage, FT_UShort *  format, GXV_Validator  gxvalid  )

static

Definition at line 637 of file gxvkern.c.

  {
    /* classic Microsoft-dialect */
#ifdef GXV_LOAD_TRACE_VARS
    FT_Bool  horizontal;
    FT_Bool  minimum;
    FT_Bool  cross_stream;
    FT_Bool  override;
#endif
 
    FT_UNUSED( gxvalid );
 
 
    /* reserved bits = 0 */
    if ( coverage & 0xFDF0 )
      return FALSE;
 
#ifdef GXV_LOAD_TRACE_VARS
    horizontal   = FT_BOOL(   coverage        & 1 );
    minimum      = FT_BOOL( ( coverage >> 1 ) & 1 );
    cross_stream = FT_BOOL( ( coverage >> 2 ) & 1 );
    override     = FT_BOOL( ( coverage >> 3 ) & 1 );
#endif
 
    *format = (FT_UShort)( ( coverage >> 8 ) & 0x0003 );
 
    GXV_TRACE(( "classic Microsoft-dialect: "
                "horizontal=%d, minimum=%d, cross-stream=%d, "
                "override=%d, format=%d\n",
                horizontal, minimum, cross_stream, override, *format ));
 
    if ( *format == 2 )
      GXV_TRACE((
        "kerning values in Microsoft format 2 subtable are ignored\n" ));
 
    return TRUE;
  }

Referenced by gxv_kern_coverage_validate().

gxv_kern_coverage_new_apple_validate()

static FT_Bool gxv_kern_coverage_new_apple_validate ( FT_UShort  coverage, FT_UShort *  format, GXV_Validator  gxvalid  )

static

Definition at line 559 of file gxvkern.c.

  {
    /* new Apple-dialect */
#ifdef GXV_LOAD_TRACE_VARS
    FT_Bool  kernVertical;
    FT_Bool  kernCrossStream;
    FT_Bool  kernVariation;
#endif
 
    FT_UNUSED( gxvalid );
 
 
    /* reserved bits = 0 */
    if ( coverage & 0x1FFC )
      return FALSE;
 
#ifdef GXV_LOAD_TRACE_VARS
    kernVertical    = FT_BOOL( ( coverage >> 15 ) & 1 );
    kernCrossStream = FT_BOOL( ( coverage >> 14 ) & 1 );
    kernVariation   = FT_BOOL( ( coverage >> 13 ) & 1 );
#endif
 
    *format = (FT_UShort)( coverage & 0x0003 );
 
    GXV_TRACE(( "new Apple-dialect: "
                "horizontal=%d, cross-stream=%d, variation=%d, format=%d\n",
                 !kernVertical, kernCrossStream, kernVariation, *format ));
 
    GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" ));
 
    return TRUE;
  }

Referenced by gxv_kern_coverage_validate().

gxv_kern_coverage_validate()

static GXV_kern_Dialect gxv_kern_coverage_validate ( FT_UShort  coverage, FT_UShort *  format, GXV_Validator  gxvalid  )

static

Definition at line 687 of file gxvkern.c.

  {
    GXV_kern_Dialect  result = KERN_DIALECT_UNKNOWN;
 
 
    GXV_NAME_ENTER( "validating coverage" );
 
    GXV_TRACE(( "interpret coverage 0x%04x by Apple style\n", coverage ));
 
    if ( KERN_IS_NEW( gxvalid ) )
    {
      if ( gxv_kern_coverage_new_apple_validate( coverage,
                                                 format,
                                                 gxvalid ) )
      {
        result = KERN_DIALECT_APPLE;
        goto Exit;
      }
    }
 
    if ( KERN_IS_CLASSIC( gxvalid ) && KERN_ALLOWS_APPLE( gxvalid ) )
    {
      if ( gxv_kern_coverage_classic_apple_validate( coverage,
                                                     format,
                                                     gxvalid ) )
      {
        result = KERN_DIALECT_APPLE;
        goto Exit;
      }
    }
 
    if ( KERN_IS_CLASSIC( gxvalid ) && KERN_ALLOWS_MS( gxvalid ) )
    {
      if ( gxv_kern_coverage_classic_microsoft_validate( coverage,
                                                         format,
                                                         gxvalid ) )
      {
        result = KERN_DIALECT_MS;
        goto Exit;
      }
    }
 
    GXV_TRACE(( "cannot interpret coverage, broken kern subtable\n" ));
 
  Exit:
    GXV_EXIT;
    return result;
  }

Referenced by gxv_kern_subtable_validate().

gxv_kern_subtable_fmt0_pairs_validate()

static void gxv_kern_subtable_fmt0_pairs_validate ( FT_Bytes  table, FT_Bytes  limit, FT_UShort  nPairs, GXV_Validator  gxvalid  )

static

Definition at line 110 of file gxvkern.c.

  {
    FT_Bytes   p = table;
    FT_UShort  i;
 
    FT_UShort  last_gid_left  = 0;
    FT_UShort  last_gid_right = 0;
 
    FT_UNUSED( limit );
 
 
    GXV_NAME_ENTER( "kern format 0 pairs" );
 
    for ( i = 0; i < nPairs; i++ )
    {
      FT_UShort  gid_left;
      FT_UShort  gid_right;
#ifdef GXV_LOAD_UNUSED_VARS
      FT_Short   kernValue;
#endif
 
 
      /* left */
      gid_left  = FT_NEXT_USHORT( p );
      gxv_glyphid_validate( gid_left, gxvalid );
 
      /* right */
      gid_right = FT_NEXT_USHORT( p );
      gxv_glyphid_validate( gid_right, gxvalid );
 
      /* Pairs of left and right GIDs must be unique and sorted. */
      GXV_TRACE(( "left gid = %u, right gid = %u\n", gid_left, gid_right ));
      if ( gid_left == last_gid_left )
      {
        if ( last_gid_right < gid_right )
          last_gid_right = gid_right;
        else
          FT_INVALID_DATA;
      }
      else if ( last_gid_left < gid_left )
      {
        last_gid_left  = gid_left;
        last_gid_right = gid_right;
      }
      else
        FT_INVALID_DATA;
 
      /* skip the kern value */
#ifdef GXV_LOAD_UNUSED_VARS
      kernValue = FT_NEXT_SHORT( p );
#else
      p += 2;
#endif
    }
 
    GXV_EXIT;
  }

Referenced by gxv_kern_subtable_fmt0_validate().

gxv_kern_subtable_fmt0_validate()

static void gxv_kern_subtable_fmt0_validate ( FT_Bytes  table, FT_Bytes  limit, GXV_Validator  gxvalid  )

static

Definition at line 172 of file gxvkern.c.

  {
    FT_Bytes   p = table + GXV_KERN_SUBTABLE_HEADER_SIZE;
 
    FT_UShort  nPairs;
    FT_UShort  unitSize;
 
 
    GXV_NAME_ENTER( "kern subtable format 0" );
 
    unitSize = 2 + 2 + 2;
    nPairs   = 0;
 
    /* nPairs, searchRange, entrySelector, rangeShift */
    GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 );
    gxv_BinSrchHeader_validate( p, limit, &unitSize, &nPairs, gxvalid );
    p += 2 + 2 + 2 + 2;
 
    gxv_kern_subtable_fmt0_pairs_validate( p, limit, nPairs, gxvalid );
 
    GXV_EXIT;
  }

Referenced by gxv_kern_subtable_validate().

gxv_kern_subtable_fmt1_entry_validate()

static void gxv_kern_subtable_fmt1_entry_validate ( FT_Byte  state, FT_UShort  flags, GXV_StateTable_GlyphOffsetCPtr  glyphOffset_p, FT_Bytes  table, FT_Bytes  limit, GXV_Validator  gxvalid  )

static

Definition at line 262 of file gxvkern.c.

  {
#ifdef GXV_LOAD_UNUSED_VARS
    FT_UShort  push;
    FT_UShort  dontAdvance;
#endif
    FT_UShort  valueOffset;
#ifdef GXV_LOAD_UNUSED_VARS
    FT_UShort  kernAction;
    FT_UShort  kernValue;
#endif
 
    FT_UNUSED( state );
    FT_UNUSED( glyphOffset_p );
 
 
#ifdef GXV_LOAD_UNUSED_VARS
    push        = (FT_UShort)( ( flags >> 15 ) & 1      );
    dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1      );
#endif
    valueOffset = (FT_UShort)(   flags         & 0x3FFF );
 
    {
      GXV_kern_fmt1_StateOptRecData  vt_rec =
        (GXV_kern_fmt1_StateOptRecData)gxvalid->statetable.optdata;
      FT_Bytes  p;
 
 
      if ( valueOffset < vt_rec->valueTable )
        FT_INVALID_OFFSET;
 
      p     = table + valueOffset;
      limit = table + vt_rec->valueTable + vt_rec->valueTable_length;
 
      GXV_LIMIT_CHECK( 2 + 2 );
#ifdef GXV_LOAD_UNUSED_VARS
      kernAction = FT_NEXT_USHORT( p );
      kernValue  = FT_NEXT_USHORT( p );
#endif
    }
  }

Referenced by gxv_kern_subtable_fmt1_validate().

gxv_kern_subtable_fmt1_subtable_setup()

static void gxv_kern_subtable_fmt1_subtable_setup ( FT_UShort  table_size, FT_UShort  classTable, FT_UShort  stateArray, FT_UShort  entryTable, FT_UShort *  classTable_length_p, FT_UShort *  stateArray_length_p, FT_UShort *  entryTable_length_p, GXV_Validator  gxvalid  )

static

Definition at line 228 of file gxvkern.c.

  {
    FT_UShort  o[4];
    FT_UShort  *l[4];
    FT_UShort  buff[5];
 
    GXV_kern_fmt1_StateOptRecData  optdata =
      (GXV_kern_fmt1_StateOptRecData)gxvalid->statetable.optdata;
 
 
    o[0] = classTable;
    o[1] = stateArray;
    o[2] = entryTable;
    o[3] = optdata->valueTable;
    l[0] = classTable_length_p;
    l[1] = stateArray_length_p;
    l[2] = entryTable_length_p;
    l[3] = &(optdata->valueTable_length);
 
    gxv_set_length_by_ushort_offset( o, l, buff, 4, table_size, gxvalid );
  }

Referenced by gxv_kern_subtable_fmt1_validate().

gxv_kern_subtable_fmt1_validate()

static void gxv_kern_subtable_fmt1_validate ( FT_Bytes  table, FT_Bytes  limit, GXV_Validator  gxvalid  )

static

Definition at line 312 of file gxvkern.c.

  {
    FT_Bytes                   p = table;
    GXV_kern_fmt1_StateOptRec  vt_rec;
 
 
    GXV_NAME_ENTER( "kern subtable format 1" );
 
    gxvalid->statetable.optdata =
      &vt_rec;
    gxvalid->statetable.optdata_load_func =
      gxv_kern_subtable_fmt1_valueTable_load;
    gxvalid->statetable.subtable_setup_func =
      gxv_kern_subtable_fmt1_subtable_setup;
    gxvalid->statetable.entry_glyphoffset_fmt =
      GXV_GLYPHOFFSET_NONE;
    gxvalid->statetable.entry_validate_func =
      gxv_kern_subtable_fmt1_entry_validate;
 
    gxv_StateTable_validate( p, limit, gxvalid );
 
    GXV_EXIT;
  }

Referenced by gxv_kern_subtable_validate().

gxv_kern_subtable_fmt1_valueTable_load()

static void gxv_kern_subtable_fmt1_valueTable_load ( FT_Bytes  table, FT_Bytes  limit, GXV_Validator  gxvalid  )

static

Definition at line 210 of file gxvkern.c.

  {
    FT_Bytes                       p = table;
    GXV_kern_fmt1_StateOptRecData  optdata =
      (GXV_kern_fmt1_StateOptRecData)gxvalid->statetable.optdata;
 
 
    GXV_LIMIT_CHECK( 2 );
    optdata->valueTable = FT_NEXT_USHORT( p );
  }

Referenced by gxv_kern_subtable_fmt1_validate().

gxv_kern_subtable_fmt2_clstbl_validate()

static void gxv_kern_subtable_fmt2_clstbl_validate ( FT_Bytes  table, FT_Bytes  limit, GXV_kern_ClassSpec  spec, GXV_Validator  gxvalid  )

static

Definition at line 373 of file gxvkern.c.

  {
    const FT_String*  tag    = GXV_KERN_FMT2_DATA( class_tag[spec] );
    GXV_odtect_Range  odtect = GXV_KERN_FMT2_DATA( odtect );
 
    FT_Bytes   p = table;
    FT_UShort  firstGlyph;
    FT_UShort  nGlyphs;
 
 
    GXV_NAME_ENTER( "kern format 2 classTable" );
 
    GXV_LIMIT_CHECK( 2 + 2 );
    firstGlyph = FT_NEXT_USHORT( p );
    nGlyphs    = FT_NEXT_USHORT( p );
    GXV_TRACE(( " %s firstGlyph=%d, nGlyphs=%d\n",
                tag, firstGlyph, nGlyphs ));
 
    gxv_glyphid_validate( firstGlyph, gxvalid );
    gxv_glyphid_validate( (FT_UShort)( firstGlyph + nGlyphs - 1 ), gxvalid );
 
    gxv_array_getlimits_ushort( p, p + ( 2 * nGlyphs ),
                                &( GXV_KERN_FMT2_DATA( offset_min[spec] ) ),
                                &( GXV_KERN_FMT2_DATA( offset_max[spec] ) ),
                                gxvalid );
 
    gxv_odtect_add_range( table, 2 * nGlyphs, tag, odtect );
 
    GXV_EXIT;
  }

Referenced by gxv_kern_subtable_fmt2_validate().

gxv_kern_subtable_fmt2_validate()

static void gxv_kern_subtable_fmt2_validate ( FT_Bytes  table, FT_Bytes  limit, GXV_Validator  gxvalid  )

static

Definition at line 409 of file gxvkern.c.

  {
    GXV_ODTECT( 3, odtect );
    GXV_kern_subtable_fmt2_DataRec  fmt2_rec =
      { 0, 0, { 0, 0 }, { 0, 0 }, { "leftClass", "rightClass" }, NULL };
 
    FT_Bytes   p = table + GXV_KERN_SUBTABLE_HEADER_SIZE;
    FT_UShort  leftOffsetTable;
    FT_UShort  rightOffsetTable;
 
 
    GXV_NAME_ENTER( "kern subtable format 2" );
 
    GXV_ODTECT_INIT( odtect );
    fmt2_rec.odtect = odtect;
    GXV_KERN_DATA( subtable_data ) = &fmt2_rec;
 
    GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 );
    GXV_KERN_FMT2_DATA( rowWidth ) = FT_NEXT_USHORT( p );
    leftOffsetTable                = FT_NEXT_USHORT( p );
    rightOffsetTable               = FT_NEXT_USHORT( p );
    GXV_KERN_FMT2_DATA( array )    = FT_NEXT_USHORT( p );
 
    GXV_TRACE(( "rowWidth = %d\n", GXV_KERN_FMT2_DATA( rowWidth ) ));
 
 
    GXV_LIMIT_CHECK( leftOffsetTable );
    GXV_LIMIT_CHECK( rightOffsetTable );
    GXV_LIMIT_CHECK( GXV_KERN_FMT2_DATA( array ) );
 
    gxv_kern_subtable_fmt2_clstbl_validate( table + leftOffsetTable, limit,
                                            GXV_KERN_CLS_L, gxvalid );
 
    gxv_kern_subtable_fmt2_clstbl_validate( table + rightOffsetTable, limit,
                                            GXV_KERN_CLS_R, gxvalid );
 
    if ( GXV_KERN_FMT2_DATA( offset_min[GXV_KERN_CLS_L] ) +
           GXV_KERN_FMT2_DATA( offset_min[GXV_KERN_CLS_R] )
         < GXV_KERN_FMT2_DATA( array )                      )
      FT_INVALID_OFFSET;
 
    gxv_odtect_add_range( table + GXV_KERN_FMT2_DATA( array ),
                          GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_L] )
                            + GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_R] )
                            - GXV_KERN_FMT2_DATA( array ),
                          "array", odtect );
 
    gxv_odtect_validate( odtect, gxvalid );
 
    GXV_EXIT;
  }

Referenced by gxv_kern_subtable_validate().

gxv_kern_subtable_fmt3_validate()

static void gxv_kern_subtable_fmt3_validate ( FT_Bytes  table, FT_Bytes  limit, GXV_Validator  gxvalid  )

static

Definition at line 467 of file gxvkern.c.

  {
    FT_Bytes   p = table + GXV_KERN_SUBTABLE_HEADER_SIZE;
    FT_UShort  glyphCount;
    FT_Byte    kernValueCount;
    FT_Byte    leftClassCount;
    FT_Byte    rightClassCount;
    FT_Byte    flags;
 
 
    GXV_NAME_ENTER( "kern subtable format 3" );
 
    GXV_LIMIT_CHECK( 2 + 1 + 1 + 1 + 1 );
    glyphCount      = FT_NEXT_USHORT( p );
    kernValueCount  = FT_NEXT_BYTE( p );
    leftClassCount  = FT_NEXT_BYTE( p );
    rightClassCount = FT_NEXT_BYTE( p );
    flags           = FT_NEXT_BYTE( p );
 
    if ( gxvalid->face->num_glyphs != glyphCount )
    {
      GXV_TRACE(( "maxGID=%d, but glyphCount=%d\n",
                  gxvalid->face->num_glyphs, glyphCount ));
      GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID );
    }
 
    if ( flags != 0 )
      GXV_TRACE(( "kern subtable fmt3 has nonzero value"
                  " (%d) in unused flag\n", flags ));
    /*
     * just skip kernValue[kernValueCount]
     */
    GXV_LIMIT_CHECK( 2 * kernValueCount );
    p += 2 * kernValueCount;
 
    /*
     * check leftClass[gid] < leftClassCount
     */
    {
      FT_Byte  min, max;
 
 
      GXV_LIMIT_CHECK( glyphCount );
      gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, gxvalid );
      p += gxvalid->subtable_length;
 
      if ( leftClassCount < max )
        FT_INVALID_DATA;
    }
 
    /*
     * check rightClass[gid] < rightClassCount
     */
    {
      FT_Byte  min, max;
 
 
      GXV_LIMIT_CHECK( glyphCount );
      gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, gxvalid );
      p += gxvalid->subtable_length;
 
      if ( rightClassCount < max )
        FT_INVALID_DATA;
    }
 
    /*
     * check kernIndex[i, j] < kernValueCount
     */
    {
      FT_UShort  i, j;
 
 
      for ( i = 0; i < leftClassCount; i++ )
      {
        for ( j = 0; j < rightClassCount; j++ )
        {
          GXV_LIMIT_CHECK( 1 );
          if ( kernValueCount < FT_NEXT_BYTE( p ) )
            FT_INVALID_OFFSET;
        }
      }
    }
 
    gxvalid->subtable_length = (FT_ULong)( p - table );
 
    GXV_EXIT;
  }

Referenced by gxv_kern_subtable_validate().

gxv_kern_subtable_validate()

static void gxv_kern_subtable_validate ( FT_Bytes  table, FT_Bytes  limit, GXV_Validator  gxvalid  )

static

Definition at line 740 of file gxvkern.c.

  {
    FT_Bytes   p = table;
#ifdef GXV_LOAD_TRACE_VARS
    FT_UShort  version = 0;    /* MS only: subtable version, unused */
#endif
    FT_ULong   length;         /* MS: 16bit, Apple: 32bit*/
    FT_UShort  coverage;
#ifdef GXV_LOAD_TRACE_VARS
    FT_UShort  tupleIndex = 0; /* Apple only */
#endif
    FT_UShort  u16[2];
    FT_UShort  format = 255;   /* subtable format */
 
 
    GXV_NAME_ENTER( "kern subtable" );
 
    GXV_LIMIT_CHECK( 2 + 2 + 2 );
    u16[0]   = FT_NEXT_USHORT( p ); /* Apple: length_hi MS: version */
    u16[1]   = FT_NEXT_USHORT( p ); /* Apple: length_lo MS: length */
    coverage = FT_NEXT_USHORT( p );
 
    switch ( gxv_kern_coverage_validate( coverage, &format, gxvalid ) )
    {
    case KERN_DIALECT_MS:
#ifdef GXV_LOAD_TRACE_VARS
      version    = u16[0];
#endif
      length     = u16[1];
#ifdef GXV_LOAD_TRACE_VARS
      tupleIndex = 0;
#endif
      GXV_TRACE(( "Subtable version = %d\n", version ));
      GXV_TRACE(( "Subtable length = %d\n", length ));
      break;
 
    case KERN_DIALECT_APPLE:
#ifdef GXV_LOAD_TRACE_VARS
      version    = 0;
#endif
      length     = ( (FT_ULong)u16[0] << 16 ) + u16[1];
#ifdef GXV_LOAD_TRACE_VARS
      tupleIndex = 0;
#endif
      GXV_TRACE(( "Subtable length = %d\n", length ));
 
      if ( KERN_IS_NEW( gxvalid ) )
      {
        GXV_LIMIT_CHECK( 2 );
#ifdef GXV_LOAD_TRACE_VARS
        tupleIndex = FT_NEXT_USHORT( p );
#else
        p += 2;
#endif
        GXV_TRACE(( "Subtable tupleIndex = %d\n", tupleIndex ));
      }
      break;
 
    default:
      length = u16[1];
      GXV_TRACE(( "cannot detect subtable dialect, "
                  "just skip %d byte\n", length ));
      goto Exit;
    }
 
    /* formats 1, 2, 3 require the position of the start of this subtable */
    if ( format == 0 )
      gxv_kern_subtable_fmt0_validate( table, table + length, gxvalid );
    else if ( format == 1 )
      gxv_kern_subtable_fmt1_validate( table, table + length, gxvalid );
    else if ( format == 2 )
      gxv_kern_subtable_fmt2_validate( table, table + length, gxvalid );
    else if ( format == 3 )
      gxv_kern_subtable_fmt3_validate( table, table + length, gxvalid );
    else
      FT_INVALID_DATA;
 
  Exit:
    gxvalid->subtable_length = length;
    GXV_EXIT;
  }

Referenced by gxv_kern_validate_generic().

gxv_kern_validate()

gxv_kern_validate	(	FT_Bytes	table,
		FT_Face	face,
		FT_Validator	ftvalid
	)

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	ftvalid
	)

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_kern_validate_generic()

static void gxv_kern_validate_generic ( FT_Bytes  table, FT_Face  face, FT_Bool  classic_only, GXV_kern_Dialect  dialect_request, FT_Validator  ftvalid  )

static

Definition at line 834 of file gxvkern.c.

  {
    GXV_ValidatorRec   gxvalidrec;
    GXV_Validator      gxvalid = &gxvalidrec;
 
    GXV_kern_DataRec   kernrec;
    GXV_kern_Data      kern = &kernrec;
 
    FT_Bytes           p     = table;
    FT_Bytes           limit = 0;
 
    FT_ULong           nTables = 0;
    FT_UInt            i;
 
 
    gxvalid->root       = ftvalid;
    gxvalid->table_data = kern;
    gxvalid->face       = face;
 
    FT_TRACE3(( "validating `kern' table\n" ));
    GXV_INIT;
    KERN_DIALECT( gxvalid ) = dialect_request;
 
    GXV_LIMIT_CHECK( 2 );
    GXV_KERN_DATA( version ) = (GXV_kern_Version)FT_NEXT_USHORT( p );
    GXV_TRACE(( "version 0x%04x (higher 16bit)\n",
                GXV_KERN_DATA( version ) ));
 
    if ( 0x0001 < GXV_KERN_DATA( version ) )
      FT_INVALID_FORMAT;
    else if ( KERN_IS_CLASSIC( gxvalid ) )
    {
      GXV_LIMIT_CHECK( 2 );
      nTables = FT_NEXT_USHORT( p );
    }
    else if ( KERN_IS_NEW( gxvalid ) )
    {
      if ( classic_only )
        FT_INVALID_FORMAT;
 
      if ( 0x0000 != FT_NEXT_USHORT( p ) )
        FT_INVALID_FORMAT;
 
      GXV_LIMIT_CHECK( 4 );
      nTables = FT_NEXT_ULONG( p );
    }
 
    for ( i = 0; i < nTables; i++ )
    {
      GXV_TRACE(( "validating subtable %d/%d\n", i, nTables ));
      /* p should be 32bit-aligned? */
      gxv_kern_subtable_validate( p, 0, gxvalid );
      p += gxvalid->subtable_length;
    }
 
    FT_TRACE4(( "\n" ));
  }

Referenced by gxv_kern_validate(), and gxv_kern_validate_classic().