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-rw-r--r--modules/freetype2/src/gxvalid/gxvprop.c330
1 files changed, 330 insertions, 0 deletions
diff --git a/modules/freetype2/src/gxvalid/gxvprop.c b/modules/freetype2/src/gxvalid/gxvprop.c
new file mode 100644
index 0000000000..63a052a8e8
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+++ b/modules/freetype2/src/gxvalid/gxvprop.c
@@ -0,0 +1,330 @@
+/****************************************************************************
+ *
+ * gxvprop.c
+ *
+ * TrueTypeGX/AAT prop table validation (body).
+ *
+ * Copyright (C) 2004-2023 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 "gxvalid.h"
+#include "gxvcommn.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 gxvprop
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** Data and Types *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+#define GXV_PROP_HEADER_SIZE ( 4 + 2 + 2 )
+#define GXV_PROP_SIZE_MIN GXV_PROP_HEADER_SIZE
+
+ typedef struct GXV_prop_DataRec_
+ {
+ FT_Fixed version;
+
+ } GXV_prop_DataRec, *GXV_prop_Data;
+
+#define GXV_PROP_DATA( field ) GXV_TABLE_DATA( prop, field )
+
+#define GXV_PROP_FLOATER 0x8000U
+#define GXV_PROP_USE_COMPLEMENTARY_BRACKET 0x1000U
+#define GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET 0x0F00U
+#define GXV_PROP_ATTACHING_TO_RIGHT 0x0080U
+#define GXV_PROP_RESERVED 0x0060U
+#define GXV_PROP_DIRECTIONALITY_CLASS 0x001FU
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** UTILITY FUNCTIONS *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ static void
+ gxv_prop_zero_advance_validate( FT_UShort gid,
+ GXV_Validator gxvalid )
+ {
+ FT_Face face;
+ FT_Error error;
+ FT_GlyphSlot glyph;
+
+
+ GXV_NAME_ENTER( "zero advance" );
+
+ face = gxvalid->face;
+
+ error = FT_Load_Glyph( face,
+ gid,
+ FT_LOAD_IGNORE_TRANSFORM );
+ if ( error )
+ FT_INVALID_GLYPH_ID;
+
+ glyph = face->glyph;
+
+ if ( glyph->advance.x != (FT_Pos)0 ||
+ glyph->advance.y != (FT_Pos)0 )
+ {
+ GXV_TRACE(( " found non-zero advance in zero-advance glyph\n" ));
+ FT_INVALID_DATA;
+ }
+
+ GXV_EXIT;
+ }
+
+
+ /* Pass 0 as GLYPH to check the default property */
+ static void
+ gxv_prop_property_validate( FT_UShort property,
+ FT_UShort glyph,
+ GXV_Validator gxvalid )
+ {
+ if ( glyph != 0 && ( property & GXV_PROP_FLOATER ) )
+ gxv_prop_zero_advance_validate( glyph, gxvalid );
+
+ if ( property & GXV_PROP_USE_COMPLEMENTARY_BRACKET )
+ {
+ FT_UShort offset;
+ char complement;
+
+
+ offset = (FT_UShort)( property & GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET );
+ if ( offset == 0 )
+ {
+ GXV_TRACE(( " found zero offset to property\n" ));
+ FT_INVALID_OFFSET;
+ }
+
+ complement = (char)( offset >> 8 );
+ if ( complement & 0x08 )
+ {
+ /* Top bit is set: negative */
+
+ /* Calculate the absolute offset */
+ complement = (char)( ( complement & 0x07 ) + 1 );
+
+ /* The gid for complement must be greater than 0 */
+ if ( glyph <= complement )
+ {
+ GXV_TRACE(( " found non-positive glyph complement\n" ));
+ FT_INVALID_DATA;
+ }
+ }
+ else
+ {
+ /* The gid for complement must be the face. */
+ gxv_glyphid_validate( (FT_UShort)( glyph + complement ), gxvalid );
+ }
+ }
+ else
+ {
+ if ( property & GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET )
+ GXV_TRACE(( "glyph %d cannot have complementary bracketing\n",
+ glyph ));
+ }
+
+ /* this is introduced in version 2.0 */
+ if ( property & GXV_PROP_ATTACHING_TO_RIGHT )
+ {
+ if ( GXV_PROP_DATA( version ) == 0x00010000UL )
+ {
+ GXV_TRACE(( " found older version (1.0) in new version table\n" ));
+ FT_INVALID_DATA;
+ }
+ }
+
+ if ( property & GXV_PROP_RESERVED )
+ {
+ GXV_TRACE(( " found non-zero bits in reserved bits\n" ));
+ FT_INVALID_DATA;
+ }
+
+ if ( ( property & GXV_PROP_DIRECTIONALITY_CLASS ) > 11 )
+ {
+ /* TODO: Too restricted. Use the validation level. */
+ if ( GXV_PROP_DATA( version ) == 0x00010000UL ||
+ GXV_PROP_DATA( version ) == 0x00020000UL )
+ {
+ GXV_TRACE(( " found too old version in directionality class\n" ));
+ FT_INVALID_DATA;
+ }
+ }
+ }
+
+
+ static void
+ gxv_prop_LookupValue_validate( FT_UShort glyph,
+ GXV_LookupValueCPtr value_p,
+ GXV_Validator gxvalid )
+ {
+ gxv_prop_property_validate( value_p->u, glyph, gxvalid );
+ }
+
+
+ /*
+ +===============+ --------+
+ | lookup header | |
+ +===============+ |
+ | BinSrchHeader | |
+ +===============+ |
+ | lastGlyph[0] | |
+ +---------------+ |
+ | firstGlyph[0] | | head of lookup table
+ +---------------+ | +
+ | offset[0] | -> | offset [byte]
+ +===============+ | +
+ | lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
+ +---------------+ |
+ | firstGlyph[1] | |
+ +---------------+ |
+ | offset[1] | |
+ +===============+ |
+ |
+ ... |
+ |
+ 16bit value array |
+ +===============+ |
+ | value | <-------+
+ ...
+ */
+
+ static GXV_LookupValueDesc
+ gxv_prop_LookupFmt4_transit( FT_UShort relative_gindex,
+ GXV_LookupValueCPtr base_value_p,
+ FT_Bytes lookuptbl_limit,
+ GXV_Validator gxvalid )
+ {
+ FT_Bytes p;
+ FT_Bytes limit;
+ FT_UShort offset;
+ GXV_LookupValueDesc value;
+
+ /* XXX: check range? */
+ offset = (FT_UShort)( base_value_p->u +
+ relative_gindex * sizeof ( FT_UShort ) );
+ p = gxvalid->lookuptbl_head + offset;
+ limit = lookuptbl_limit;
+
+ GXV_LIMIT_CHECK ( 2 );
+ value.u = FT_NEXT_USHORT( p );
+
+ return value;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** prop TABLE *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ FT_LOCAL_DEF( void )
+ gxv_prop_validate( FT_Bytes table,
+ FT_Face face,
+ FT_Validator ftvalid )
+ {
+ 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%08lx\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 %ld 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" ));
+ }
+
+
+/* END */
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