Update freetype sources (2.6.2) in third party.

third_party/freetype2/src/src/gxvalid/gxvmort.c

Index: third_party/freetype2/src/src/gxvalid/gxvmort.c
diff --git a/third_party/freetype2/src/src/gxvalid/gxvmort.c b/third_party/freetype2/src/src/gxvalid/gxvmort.c
new file mode 100644
index 0000000000000000000000000000000000000000..a9e7a58fea04177a6bbfc6c7198816549d503129
--- /dev/null
+++ b/third_party/freetype2/src/src/gxvalid/gxvmort.c
@@ -0,0 +1,300 @@
+/***************************************************************************/
+/*                                                                         */
+/*  gxvmort.c                                                              */
+/*                                                                         */
+/*    TrueTypeGX/AAT mort table validation (body).                         */
+/*                                                                         */
+/*  Copyright 2005-2015 by                                                 */
+/*  suzuki toshiya, Masatake YAMATO, Red Hat K.K.,                         */
+/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
+/*                                                                         */
+/*  This file is part of the FreeType project, and may only be used,       */
+/*  modified, and distributed under the terms of the FreeType project      */
+/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
+/*  this file you indicate that you have read the license and              */
+/*  understand and accept it fully.                                        */
+/*                                                                         */
+/***************************************************************************/
+
+/***************************************************************************/
+/*                                                                         */
+/* gxvalid is derived from both gxlayout module and otvalid module.        */
+/* Development of gxlayout is supported by the Information-technology      */
+/* Promotion Agency(IPA), Japan.                                           */
+/*                                                                         */
+/***************************************************************************/
+
+
+#include "gxvmort.h"
+#include "gxvfeat.h"
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
+  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
+  /* messages during execution.                                            */
+  /*                                                                       */
+#undef  FT_COMPONENT
+#define FT_COMPONENT  trace_gxvmort
+
+
+  static void
+  gxv_mort_feature_validate( GXV_mort_feature  f,
+                             GXV_Validator     gxvalid )
+  {
+    if ( f->featureType >= gxv_feat_registry_length )
+    {
+      GXV_TRACE(( "featureType %d is out of registered range, "
+                  "setting %d is unchecked\n",
+                  f->featureType, f->featureSetting ));
+      GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
+    }
+    else if ( !gxv_feat_registry[f->featureType].existence )
+    {
+      GXV_TRACE(( "featureType %d is within registered area "
+                  "but undefined, setting %d is unchecked\n",
+                  f->featureType, f->featureSetting ));
+      GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
+    }
+    else
+    {
+      FT_Byte  nSettings_max;
+
+
+      /* nSettings in gxvfeat.c is halved for exclusive on/off settings */
+      nSettings_max = gxv_feat_registry[f->featureType].nSettings;
+      if ( gxv_feat_registry[f->featureType].exclusive )
+        nSettings_max = (FT_Byte)( 2 * nSettings_max );
+
+      GXV_TRACE(( "featureType %d is registered", f->featureType ));
+      GXV_TRACE(( "setting %d", f->featureSetting ));
+
+      if ( f->featureSetting > nSettings_max )
+      {
+        GXV_TRACE(( "out of defined range %d", nSettings_max ));
+        GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
+      }
+      GXV_TRACE(( "\n" ));
+    }
+
+    /* TODO: enableFlags must be unique value in specified chain?  */
+  }
+
+
+  /*
+   * nFeatureFlags is typed to FT_ULong to accept that in
+   * mort (typed FT_UShort) and morx (typed FT_ULong).
+   */
+  FT_LOCAL_DEF( void )
+  gxv_mort_featurearray_validate( FT_Bytes       table,
+                                  FT_Bytes       limit,
+                                  FT_ULong       nFeatureFlags,
+                                  GXV_Validator  gxvalid )
+  {
+    FT_Bytes  p = table;
+    FT_ULong  i;
+
+    GXV_mort_featureRec  f = GXV_MORT_FEATURE_OFF;
+
+
+    GXV_NAME_ENTER( "mort feature list" );
+    for ( i = 0; i < nFeatureFlags; i++ )
+    {
+      GXV_LIMIT_CHECK( 2 + 2 + 4 + 4 );
+      f.featureType    = FT_NEXT_USHORT( p );
+      f.featureSetting = FT_NEXT_USHORT( p );
+      f.enableFlags    = FT_NEXT_ULONG( p );
+      f.disableFlags   = FT_NEXT_ULONG( p );
+
+      gxv_mort_feature_validate( &f, gxvalid );
+    }
+
+    if ( !IS_GXV_MORT_FEATURE_OFF( f ) )
+      FT_INVALID_DATA;
+
+    gxvalid->subtable_length = (FT_ULong)( p - table );
+    GXV_EXIT;
+  }
+
+
+  FT_LOCAL_DEF( void )
+  gxv_mort_coverage_validate( FT_UShort      coverage,
+                              GXV_Validator  gxvalid )
+  {
+    FT_UNUSED( gxvalid );
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+    if ( coverage & 0x8000U )
+      GXV_TRACE(( " this subtable is for vertical text only\n" ));
+    else
+      GXV_TRACE(( " this subtable is for horizontal text only\n" ));
+
+    if ( coverage & 0x4000 )
+      GXV_TRACE(( " this subtable is applied to glyph array "
+                  "in descending order\n" ));
+    else
+      GXV_TRACE(( " this subtable is applied to glyph array "
+                  "in ascending order\n" ));
+
+    if ( coverage & 0x2000 )
+      GXV_TRACE(( " this subtable is forcibly applied to "
+                  "vertical/horizontal text\n" ));
+
+    if ( coverage & 0x1FF8 )
+      GXV_TRACE(( " coverage has non-zero bits in reserved area\n" ));
+#endif
+  }
+
+
+  static void
+  gxv_mort_subtables_validate( FT_Bytes       table,
+                               FT_Bytes       limit,
+                               FT_UShort      nSubtables,
+                               GXV_Validator  gxvalid )
+  {
+    FT_Bytes  p = table;
+
+    GXV_Validate_Func fmt_funcs_table[] =
+    {
+      gxv_mort_subtable_type0_validate, /* 0 */
+      gxv_mort_subtable_type1_validate, /* 1 */
+      gxv_mort_subtable_type2_validate, /* 2 */
+      NULL,                             /* 3 */
+      gxv_mort_subtable_type4_validate, /* 4 */
+      gxv_mort_subtable_type5_validate, /* 5 */
+
+    };
+
+    FT_UShort  i;
+
+
+    GXV_NAME_ENTER( "subtables in a chain" );
+
+    for ( i = 0; i < nSubtables; i++ )
+    {
+      GXV_Validate_Func  func;
+
+      FT_UShort  length;
+      FT_UShort  coverage;
+#ifdef GXV_LOAD_UNUSED_VARS
+      FT_ULong   subFeatureFlags;
+#endif
+      FT_UInt    type;
+      FT_UInt    rest;
+
+
+      GXV_LIMIT_CHECK( 2 + 2 + 4 );
+      length          = FT_NEXT_USHORT( p );
+      coverage        = FT_NEXT_USHORT( p );
+#ifdef GXV_LOAD_UNUSED_VARS
+      subFeatureFlags = FT_NEXT_ULONG( p );
+#else
+      p += 4;
+#endif
+
+      GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n",
+                  i + 1, nSubtables, length ));
+      type = coverage & 0x0007;
+      rest = length - ( 2 + 2 + 4 );
+
+      GXV_LIMIT_CHECK( rest );
+      gxv_mort_coverage_validate( coverage, gxvalid );
+
+      if ( type > 5 )
+        FT_INVALID_FORMAT;
+
+      func = fmt_funcs_table[type];
+      if ( func == NULL )
+        GXV_TRACE(( "morx type %d is reserved\n", type ));
+
+      func( p, p + rest, gxvalid );
+
+      p += rest;
+      /* TODO: validate subFeatureFlags */
+    }
+
+    gxvalid->subtable_length = (FT_ULong)( p - table );
+
+    GXV_EXIT;
+  }
+
+
+  static void
+  gxv_mort_chain_validate( FT_Bytes       table,
+                           FT_Bytes       limit,
+                           GXV_Validator  gxvalid )
+  {
+    FT_Bytes   p = table;
+#ifdef GXV_LOAD_UNUSED_VARS
+    FT_ULong   defaultFlags;
+#endif
+    FT_ULong   chainLength;
+    FT_UShort  nFeatureFlags;
+    FT_UShort  nSubtables;
+
+
+    GXV_NAME_ENTER( "mort chain header" );
+
+    GXV_LIMIT_CHECK( 4 + 4 + 2 + 2 );
+#ifdef GXV_LOAD_UNUSED_VARS
+    defaultFlags  = FT_NEXT_ULONG( p );
+#else
+    p += 4;
+#endif
+    chainLength   = FT_NEXT_ULONG( p );
+    nFeatureFlags = FT_NEXT_USHORT( p );
+    nSubtables    = FT_NEXT_USHORT( p );
+
+    gxv_mort_featurearray_validate( p, table + chainLength,
+                                    nFeatureFlags, gxvalid );
+    p += gxvalid->subtable_length;
+    gxv_mort_subtables_validate( p, table + chainLength, nSubtables, gxvalid );
+    gxvalid->subtable_length = chainLength;
+
+    /* TODO: validate defaultFlags */
+    GXV_EXIT;
+  }
+
+
+  FT_LOCAL_DEF( void )
+  gxv_mort_validate( FT_Bytes      table,
+                     FT_Face       face,
+                     FT_Validator  ftvalid )
+  {
+    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" ));
+  }
+
+
+/* END */