330 lines
11 KiB
C
330 lines
11 KiB
C
/***************************************************************************/
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/* */
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/* gxvprop.c */
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/* */
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/* TrueTypeGX/AAT prop table validation (body). */
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/* */
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/* Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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/***************************************************************************/
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/* */
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/* gxvalid is derived from both gxlayout module and otvalid module. */
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/* Development of gxlayout is supported by the Information-technology */
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/* Promotion Agency(IPA), Japan. */
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/* */
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/***************************************************************************/
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#include "gxvalid.h"
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#include "gxvcommn.h"
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_gxvprop
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** Data and Types *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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#define GXV_PROP_HEADER_SIZE ( 4 + 2 + 2 )
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#define GXV_PROP_SIZE_MIN GXV_PROP_HEADER_SIZE
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typedef struct GXV_prop_DataRec_
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{
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FT_Fixed version;
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} GXV_prop_DataRec, *GXV_prop_Data;
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#define GXV_PROP_DATA( field ) GXV_TABLE_DATA( prop, field )
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#define GXV_PROP_FLOATER 0x8000U
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#define GXV_PROP_USE_COMPLEMENTARY_BRACKET 0x1000U
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#define GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET 0x0F00U
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#define GXV_PROP_ATTACHING_TO_RIGHT 0x0080U
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#define GXV_PROP_RESERVED 0x0060U
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#define GXV_PROP_DIRECTIONALITY_CLASS 0x001FU
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** UTILITY FUNCTIONS *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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static void
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gxv_prop_zero_advance_validate( FT_UShort gid,
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GXV_Validator valid )
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{
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FT_Face face;
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FT_Error error;
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FT_GlyphSlot glyph;
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GXV_NAME_ENTER( "zero advance" );
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face = valid->face;
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error = FT_Load_Glyph( face,
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gid,
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FT_LOAD_IGNORE_TRANSFORM );
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if ( error )
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FT_INVALID_GLYPH_ID;
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glyph = face->glyph;
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if ( glyph->advance.x != (FT_Pos)0 ||
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glyph->advance.y != (FT_Pos)0 )
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{
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GXV_TRACE(( " found non-zero advance in zero-advance glyph\n" ));
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FT_INVALID_DATA;
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}
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GXV_EXIT;
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}
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/* Pass 0 as GLYPH to check the default property */
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static void
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gxv_prop_property_validate( FT_UShort property,
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FT_UShort glyph,
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GXV_Validator valid )
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{
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if ( glyph != 0 && ( property & GXV_PROP_FLOATER ) )
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gxv_prop_zero_advance_validate( glyph, valid );
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if ( property & GXV_PROP_USE_COMPLEMENTARY_BRACKET )
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{
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FT_UShort offset;
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char complement;
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offset = (FT_UShort)( property & GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET );
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if ( offset == 0 )
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{
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GXV_TRACE(( " found zero offset to property\n" ));
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FT_INVALID_OFFSET;
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}
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complement = (char)( offset >> 8 );
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if ( complement & 0x08 )
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{
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/* Top bit is set: negative */
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/* Calculate the absolute offset */
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complement = (char)( ( complement & 0x07 ) + 1 );
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/* The gid for complement must be greater than 0 */
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if ( glyph <= complement )
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{
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GXV_TRACE(( " found non-positive glyph complement\n" ));
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FT_INVALID_DATA;
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}
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}
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else
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{
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/* The gid for complement must be the face. */
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gxv_glyphid_validate( (FT_UShort)( glyph + complement ), valid );
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}
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}
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else
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{
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if ( property & GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET )
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GXV_TRACE(( "glyph %d cannot have complementary bracketing\n",
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glyph ));
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}
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/* this is introduced in version 2.0 */
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if ( property & GXV_PROP_ATTACHING_TO_RIGHT )
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{
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if ( GXV_PROP_DATA( version ) == 0x00010000UL )
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{
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GXV_TRACE(( " found older version (1.0) in new version table\n" ));
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FT_INVALID_DATA;
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}
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}
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if ( property & GXV_PROP_RESERVED )
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{
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GXV_TRACE(( " found non-zero bits in reserved bits\n" ));
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FT_INVALID_DATA;
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}
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if ( ( property & GXV_PROP_DIRECTIONALITY_CLASS ) > 11 )
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{
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/* TODO: Too restricted. Use the validation level. */
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if ( GXV_PROP_DATA( version ) == 0x00010000UL ||
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GXV_PROP_DATA( version ) == 0x00020000UL )
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{
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GXV_TRACE(( " found too old version in directionality class\n" ));
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FT_INVALID_DATA;
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}
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}
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}
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static void
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gxv_prop_LookupValue_validate( FT_UShort glyph,
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GXV_LookupValueCPtr value_p,
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GXV_Validator valid )
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{
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gxv_prop_property_validate( value_p->u, glyph, valid );
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}
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/*
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+===============+ --------+
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| lookup header | |
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+===============+ |
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| BinSrchHeader | |
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+===============+ |
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| lastGlyph[0] | |
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+---------------+ |
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| firstGlyph[0] | | head of lookup table
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+---------------+ | +
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| offset[0] | -> | offset [byte]
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+===============+ | +
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| lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
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+---------------+ |
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| firstGlyph[1] | |
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+---------------+ |
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| offset[1] | |
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+===============+ |
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... |
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16bit value array |
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+===============+ |
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| value | <-------+
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...
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*/
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static GXV_LookupValueDesc
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gxv_prop_LookupFmt4_transit( FT_UShort relative_gindex,
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GXV_LookupValueCPtr base_value_p,
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FT_Bytes lookuptbl_limit,
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GXV_Validator valid )
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{
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FT_Bytes p;
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FT_Bytes limit;
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FT_UShort offset;
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GXV_LookupValueDesc value;
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/* XXX: check range? */
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offset = (FT_UShort)( base_value_p->u +
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relative_gindex * sizeof ( FT_UShort ) );
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p = valid->lookuptbl_head + offset;
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limit = lookuptbl_limit;
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GXV_LIMIT_CHECK ( 2 );
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value.u = FT_NEXT_USHORT( p );
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return value;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** prop TABLE *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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FT_LOCAL_DEF( void )
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gxv_prop_validate( FT_Bytes table,
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FT_Face face,
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FT_Validator ftvalid )
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{
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FT_Bytes p = table;
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FT_Bytes limit = 0;
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GXV_ValidatorRec validrec;
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GXV_Validator valid = &validrec;
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GXV_prop_DataRec proprec;
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GXV_prop_Data prop = &proprec;
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FT_Fixed version;
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FT_UShort format;
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FT_UShort defaultProp;
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valid->root = ftvalid;
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valid->table_data = prop;
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valid->face = face;
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FT_TRACE3(( "validating `prop' table\n" ));
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GXV_INIT;
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GXV_LIMIT_CHECK( 4 + 2 + 2 );
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version = FT_NEXT_ULONG( p );
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format = FT_NEXT_USHORT( p );
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defaultProp = FT_NEXT_USHORT( p );
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GXV_TRACE(( " version 0x%08x\n", version ));
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GXV_TRACE(( " format 0x%04x\n", format ));
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GXV_TRACE(( " defaultProp 0x%04x\n", defaultProp ));
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/* only versions 1.0, 2.0, 3.0 are defined (1996) */
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if ( version != 0x00010000UL &&
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version != 0x00020000UL &&
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version != 0x00030000UL )
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{
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GXV_TRACE(( " found unknown version\n" ));
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FT_INVALID_FORMAT;
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}
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/* only formats 0x0000, 0x0001 are defined (1996) */
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if ( format > 1 )
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{
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GXV_TRACE(( " found unknown format\n" ));
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FT_INVALID_FORMAT;
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}
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gxv_prop_property_validate( defaultProp, 0, valid );
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if ( format == 0 )
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{
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FT_TRACE3(( "(format 0, no per-glyph properties, "
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"remaining %d bytes are skipped)", limit - p ));
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goto Exit;
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}
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/* format == 1 */
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GXV_PROP_DATA( version ) = version;
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valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
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valid->lookupval_func = gxv_prop_LookupValue_validate;
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valid->lookupfmt4_trans = gxv_prop_LookupFmt4_transit;
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gxv_LookupTable_validate( p, limit, valid );
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Exit:
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FT_TRACE4(( "\n" ));
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}
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/* END */
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