Update freetype sources (2.6.2) in third party.

third_party/freetype2/src/src/gxvalid/gxvmort2.c

Index: third_party/freetype2/src/src/gxvalid/gxvmort2.c
diff --git a/third_party/freetype2/src/src/gxvalid/gxvmort2.c b/third_party/freetype2/src/src/gxvalid/gxvmort2.c
new file mode 100644
index 0000000000000000000000000000000000000000..6f56c94ca778c108e1e28066fc3c0c722c188dfb
--- /dev/null
+++ b/third_party/freetype2/src/src/gxvalid/gxvmort2.c
@@ -0,0 +1,312 @@
+/***************************************************************************/
+/*                                                                         */
+/*  gxvmort2.c                                                             */
+/*                                                                         */
+/*    TrueTypeGX/AAT mort table validation                                 */
+/*    body for type2 (Ligature Substitution) subtable.                     */
+/*                                                                         */
+/*  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"
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* 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
+
+
+  typedef struct  GXV_mort_subtable_type2_StateOptRec_
+  {
+    FT_UShort  ligActionTable;
+    FT_UShort  componentTable;
+    FT_UShort  ligatureTable;
+    FT_UShort  ligActionTable_length;
+    FT_UShort  componentTable_length;
+    FT_UShort  ligatureTable_length;
+
+  }  GXV_mort_subtable_type2_StateOptRec,
+    *GXV_mort_subtable_type2_StateOptRecData;
+
+#define GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE \
+          ( GXV_STATETABLE_HEADER_SIZE + 2 + 2 + 2 )
+
+
+  static void
+  gxv_mort_subtable_type2_opttable_load( FT_Bytes       table,
+                                         FT_Bytes       limit,
+                                         GXV_Validator  gxvalid )
+  {
+    FT_Bytes  p = table;
+    GXV_mort_subtable_type2_StateOptRecData  optdata =
+      (GXV_mort_subtable_type2_StateOptRecData)gxvalid->statetable.optdata;
+
+
+    GXV_LIMIT_CHECK( 2 + 2 + 2 );
+    optdata->ligActionTable = FT_NEXT_USHORT( p );
+    optdata->componentTable = FT_NEXT_USHORT( p );
+    optdata->ligatureTable  = FT_NEXT_USHORT( p );
+
+    GXV_TRACE(( "offset to ligActionTable=0x%04x\n",
+                optdata->ligActionTable ));
+    GXV_TRACE(( "offset to componentTable=0x%04x\n",
+                optdata->componentTable ));
+    GXV_TRACE(( "offset to ligatureTable=0x%04x\n",
+                optdata->ligatureTable ));
+  }
+
+
+  static void
+  gxv_mort_subtable_type2_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 )
+  {
+    FT_UShort  o[6];
+    FT_UShort  *l[6];
+    FT_UShort  buff[7];
+
+    GXV_mort_subtable_type2_StateOptRecData  optdata =
+      (GXV_mort_subtable_type2_StateOptRecData)gxvalid->statetable.optdata;
+
+
+    GXV_NAME_ENTER( "subtable boundaries setup" );
+
+    o[0] = classTable;
+    o[1] = stateArray;
+    o[2] = entryTable;
+    o[3] = optdata->ligActionTable;
+    o[4] = optdata->componentTable;
+    o[5] = optdata->ligatureTable;
+    l[0] = classTable_length_p;
+    l[1] = stateArray_length_p;
+    l[2] = entryTable_length_p;
+    l[3] = &(optdata->ligActionTable_length);
+    l[4] = &(optdata->componentTable_length);
+    l[5] = &(optdata->ligatureTable_length);
+
+    gxv_set_length_by_ushort_offset( o, l, buff, 6, table_size, gxvalid );
+
+    GXV_TRACE(( "classTable: offset=0x%04x length=0x%04x\n",
+                classTable, *classTable_length_p ));
+    GXV_TRACE(( "stateArray: offset=0x%04x length=0x%04x\n",
+                stateArray, *stateArray_length_p ));
+    GXV_TRACE(( "entryTable: offset=0x%04x length=0x%04x\n",
+                entryTable, *entryTable_length_p ));
+    GXV_TRACE(( "ligActionTable: offset=0x%04x length=0x%04x\n",
+                optdata->ligActionTable,
+                optdata->ligActionTable_length ));
+    GXV_TRACE(( "componentTable: offset=0x%04x length=0x%04x\n",
+                optdata->componentTable,
+                optdata->componentTable_length ));
+    GXV_TRACE(( "ligatureTable:  offset=0x%04x length=0x%04x\n",
+                optdata->ligatureTable,
+                optdata->ligatureTable_length ));
+
+    GXV_EXIT;
+  }
+
+
+  static void
+  gxv_mort_subtable_type2_ligActionOffset_validate(
+    FT_Bytes       table,
+    FT_UShort      ligActionOffset,
+    GXV_Validator  gxvalid )
+  {
+    /* access ligActionTable */
+    GXV_mort_subtable_type2_StateOptRecData  optdata =
+      (GXV_mort_subtable_type2_StateOptRecData)gxvalid->statetable.optdata;
+
+    FT_Bytes lat_base  = table + optdata->ligActionTable;
+    FT_Bytes p         = table + ligActionOffset;
+    FT_Bytes lat_limit = lat_base + optdata->ligActionTable;
+
+
+    GXV_32BIT_ALIGNMENT_VALIDATE( ligActionOffset );
+    if ( p < lat_base )
+    {
+      GXV_TRACE(( "too short offset 0x%04x: p < lat_base (%d byte rewind)\n",
+                  ligActionOffset, lat_base - p ));
+
+      /* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */
+      GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET );
+    }
+    else if ( lat_limit < p )
+    {
+      GXV_TRACE(( "too large offset 0x%04x: lat_limit < p (%d byte overrun)\n",
+                  ligActionOffset, p - lat_limit ));
+
+      /* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */
+      GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET );
+    }
+    else
+    {
+      /* validate entry in ligActionTable */
+      FT_ULong   lig_action;
+#ifdef GXV_LOAD_UNUSED_VARS
+      FT_UShort  last;
+      FT_UShort  store;
+#endif
+      FT_ULong   offset;
+
+
+      lig_action = FT_NEXT_ULONG( p );
+#ifdef GXV_LOAD_UNUSED_VARS
+      last   = (FT_UShort)( ( lig_action >> 31 ) & 1 );
+      store  = (FT_UShort)( ( lig_action >> 30 ) & 1 );
+#endif
+
+      /* Apple spec defines this offset as a word offset */
+      offset = lig_action & 0x3FFFFFFFUL;
+      if ( offset * 2 < optdata->ligatureTable )
+      {
+        GXV_TRACE(( "too short offset 0x%08x:"
+                    " 2 x offset < ligatureTable (%d byte rewind)\n",
+                     offset, optdata->ligatureTable - offset * 2 ));
+
+        GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET );
+      } else if ( offset * 2 >
+                  optdata->ligatureTable + optdata->ligatureTable_length )
+      {
+        GXV_TRACE(( "too long offset 0x%08x:"
+                    " 2 x offset > ligatureTable + ligatureTable_length"
+                    " (%d byte overrun)\n",
+                     offset,
+                     optdata->ligatureTable + optdata->ligatureTable_length
+                     - offset * 2 ));
+
+        GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET );
+      }
+    }
+  }
+
+
+  static void
+  gxv_mort_subtable_type2_entry_validate(
+    FT_Byte                         state,
+    FT_UShort                       flags,
+    GXV_StateTable_GlyphOffsetCPtr  glyphOffset_p,
+    FT_Bytes                        table,
+    FT_Bytes                        limit,
+    GXV_Validator                   gxvalid )
+  {
+#ifdef GXV_LOAD_UNUSED_VARS
+    FT_UShort setComponent;
+    FT_UShort dontAdvance;
+#endif
+    FT_UShort offset;
+
+    FT_UNUSED( state );
+    FT_UNUSED( glyphOffset_p );
+    FT_UNUSED( limit );
+
+
+#ifdef GXV_LOAD_UNUSED_VARS
+    setComponent = (FT_UShort)( ( flags >> 15 ) & 1 );
+    dontAdvance  = (FT_UShort)( ( flags >> 14 ) & 1 );
+#endif
+
+    offset = (FT_UShort)( flags & 0x3FFFU );
+
+    if ( 0 < offset )
+      gxv_mort_subtable_type2_ligActionOffset_validate( table, offset,
+                                                        gxvalid );
+  }
+
+
+  static void
+  gxv_mort_subtable_type2_ligatureTable_validate( FT_Bytes       table,
+                                                  GXV_Validator  gxvalid )
+  {
+    GXV_mort_subtable_type2_StateOptRecData  optdata =
+      (GXV_mort_subtable_type2_StateOptRecData)gxvalid->statetable.optdata;
+
+    FT_Bytes p     = table + optdata->ligatureTable;
+    FT_Bytes limit = table + optdata->ligatureTable
+                           + optdata->ligatureTable_length;
+
+
+    GXV_NAME_ENTER( "mort chain subtable type2 - substitutionTable" );
+    if ( 0 != optdata->ligatureTable )
+    {
+      /* Apple does not give specification of ligatureTable format */
+      while ( p < limit )
+      {
+        FT_UShort  lig_gid;
+
+
+        GXV_LIMIT_CHECK( 2 );
+        lig_gid = FT_NEXT_USHORT( p );
+
+        if ( gxvalid->face->num_glyphs < lig_gid )
+          GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID );
+      }
+    }
+    GXV_EXIT;
+  }
+
+
+  FT_LOCAL_DEF( void )
+  gxv_mort_subtable_type2_validate( FT_Bytes       table,
+                                    FT_Bytes       limit,
+                                    GXV_Validator  gxvalid )
+  {
+    FT_Bytes  p = table;
+
+    GXV_mort_subtable_type2_StateOptRec  lig_rec;
+
+
+    GXV_NAME_ENTER( "mort chain subtable type2 (Ligature Substitution)" );
+
+    GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE );
+
+    gxvalid->statetable.optdata =
+      &lig_rec;
+    gxvalid->statetable.optdata_load_func =
+      gxv_mort_subtable_type2_opttable_load;
+    gxvalid->statetable.subtable_setup_func =
+      gxv_mort_subtable_type2_subtable_setup;
+    gxvalid->statetable.entry_glyphoffset_fmt =
+      GXV_GLYPHOFFSET_NONE;
+    gxvalid->statetable.entry_validate_func =
+      gxv_mort_subtable_type2_entry_validate;
+
+    gxv_StateTable_validate( p, limit, gxvalid );
+
+    p += gxvalid->subtable_length;
+    gxv_mort_subtable_type2_ligatureTable_validate( table, gxvalid );
+
+    gxvalid->subtable_length = (FT_ULong)( p - table );
+
+    GXV_EXIT;
+  }
+
+
+/* END */