ref: 5116f129633d05c174504fb3b2586b7f92cee17f
dir: /src/gxvalid/gxvjust.c/
/****************************************************************************
*
* gxvjust.c
*
* TrueTypeGX/AAT just table validation (body).
*
* Copyright (C) 2005-2021 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"
#include <freetype/ftsnames.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 gxvjust
/*
* referred `just' table format specification:
* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6just.html
* last updated 2000.
* ----------------------------------------------
* [JUST HEADER]: GXV_JUST_HEADER_SIZE
* version (fixed: 32bit) = 0x00010000
* format (uint16: 16bit) = 0 is only defined (2000)
* horizOffset (uint16: 16bit)
* vertOffset (uint16: 16bit)
* ----------------------------------------------
*/
typedef struct GXV_just_DataRec_
{
FT_UShort wdc_offset_max;
FT_UShort wdc_offset_min;
FT_UShort pc_offset_max;
FT_UShort pc_offset_min;
} GXV_just_DataRec, *GXV_just_Data;
#define GXV_JUST_DATA( a ) GXV_TABLE_DATA( just, a )
/* GX just table does not define their subset of GID */
static void
gxv_just_check_max_gid( FT_UShort gid,
const FT_String* msg_tag,
GXV_Validator gxvalid )
{
FT_UNUSED( msg_tag );
if ( gid < gxvalid->face->num_glyphs )
return;
GXV_TRACE(( "just table includes too large %s"
" GID=%d > %d (in maxp)\n",
msg_tag, gid, gxvalid->face->num_glyphs ));
GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID );
}
static void
gxv_just_wdp_entry_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
FT_ULong justClass;
#ifdef GXV_LOAD_UNUSED_VARS
FT_Fixed beforeGrowLimit;
FT_Fixed beforeShrinkGrowLimit;
FT_Fixed afterGrowLimit;
FT_Fixed afterShrinkGrowLimit;
FT_UShort growFlags;
FT_UShort shrinkFlags;
#endif
GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 + 4 + 2 + 2 );
justClass = FT_NEXT_ULONG( p );
#ifndef GXV_LOAD_UNUSED_VARS
p += 4 + 4 + 4 + 4 + 2 + 2;
#else
beforeGrowLimit = FT_NEXT_ULONG( p );
beforeShrinkGrowLimit = FT_NEXT_ULONG( p );
afterGrowLimit = FT_NEXT_ULONG( p );
afterShrinkGrowLimit = FT_NEXT_ULONG( p );
growFlags = FT_NEXT_USHORT( p );
shrinkFlags = FT_NEXT_USHORT( p );
#endif
/* According to Apple spec, only 7bits in justClass is used */
if ( ( justClass & 0xFFFFFF80UL ) != 0 )
{
GXV_TRACE(( "just table includes non-zero value"
" in unused justClass higher bits"
" of WidthDeltaPair" ));
GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
}
gxvalid->subtable_length = (FT_ULong)( p - table );
}
static void
gxv_just_wdc_entry_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
FT_ULong count, i;
GXV_LIMIT_CHECK( 4 );
count = FT_NEXT_ULONG( p );
for ( i = 0; i < count; i++ )
{
GXV_TRACE(( "validating wdc pair %d/%d\n", i + 1, count ));
gxv_just_wdp_entry_validate( p, limit, gxvalid );
p += gxvalid->subtable_length;
}
gxvalid->subtable_length = (FT_ULong)( p - table );
}
static void
gxv_just_widthDeltaClusters_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
FT_Bytes wdc_end = table + GXV_JUST_DATA( wdc_offset_max );
FT_UInt i;
GXV_NAME_ENTER( "just justDeltaClusters" );
if ( limit <= wdc_end )
FT_INVALID_OFFSET;
for ( i = 0; p <= wdc_end; i++ )
{
gxv_just_wdc_entry_validate( p, limit, gxvalid );
p += gxvalid->subtable_length;
}
gxvalid->subtable_length = (FT_ULong)( p - table );
GXV_EXIT;
}
static void
gxv_just_actSubrecord_type0_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
FT_Fixed lowerLimit;
FT_Fixed upperLimit;
#ifdef GXV_LOAD_UNUSED_VARS
FT_UShort order;
#endif
FT_UShort decomposedCount;
FT_UInt i;
GXV_LIMIT_CHECK( 4 + 4 + 2 + 2 );
lowerLimit = FT_NEXT_LONG( p );
upperLimit = FT_NEXT_LONG( p );
#ifdef GXV_LOAD_UNUSED_VARS
order = FT_NEXT_USHORT( p );
#else
p += 2;
#endif
decomposedCount = FT_NEXT_USHORT( p );
if ( lowerLimit >= upperLimit )
{
GXV_TRACE(( "just table includes invalid range spec:"
" lowerLimit(%d) > upperLimit(%d)\n" ));
GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
}
for ( i = 0; i < decomposedCount; i++ )
{
FT_UShort glyphs;
GXV_LIMIT_CHECK( 2 );
glyphs = FT_NEXT_USHORT( p );
gxv_just_check_max_gid( glyphs, "type0:glyphs", gxvalid );
}
gxvalid->subtable_length = (FT_ULong)( p - table );
}
static void
gxv_just_actSubrecord_type1_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
FT_UShort addGlyph;
GXV_LIMIT_CHECK( 2 );
addGlyph = FT_NEXT_USHORT( p );
gxv_just_check_max_gid( addGlyph, "type1:addGlyph", gxvalid );
gxvalid->subtable_length = (FT_ULong)( p - table );
}
static void
gxv_just_actSubrecord_type2_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
#ifdef GXV_LOAD_UNUSED_VARS
FT_Fixed substThreshhold; /* Apple misspelled "Threshhold" */
#endif
FT_UShort addGlyph;
FT_UShort substGlyph;
GXV_LIMIT_CHECK( 4 + 2 + 2 );
#ifdef GXV_LOAD_UNUSED_VARS
substThreshhold = FT_NEXT_ULONG( p );
#else
p += 4;
#endif
addGlyph = FT_NEXT_USHORT( p );
substGlyph = FT_NEXT_USHORT( p );
if ( addGlyph != 0xFFFF )
gxv_just_check_max_gid( addGlyph, "type2:addGlyph", gxvalid );
gxv_just_check_max_gid( substGlyph, "type2:substGlyph", gxvalid );
gxvalid->subtable_length = (FT_ULong)( p - table );
}
static void
gxv_just_actSubrecord_type4_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
FT_ULong variantsAxis;
FT_Fixed minimumLimit;
FT_Fixed noStretchValue;
FT_Fixed maximumLimit;
GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 );
variantsAxis = FT_NEXT_ULONG( p );
minimumLimit = FT_NEXT_LONG( p );
noStretchValue = FT_NEXT_LONG( p );
maximumLimit = FT_NEXT_LONG( p );
gxvalid->subtable_length = (FT_ULong)( p - table );
if ( variantsAxis != 0x64756374L ) /* 'duct' */
GXV_TRACE(( "variantsAxis 0x%08x is non default value",
variantsAxis ));
if ( minimumLimit > noStretchValue )
GXV_TRACE(( "type4:minimumLimit 0x%08x > noStretchValue 0x%08x\n",
minimumLimit, noStretchValue ));
else if ( noStretchValue > maximumLimit )
GXV_TRACE(( "type4:noStretchValue 0x%08x > maximumLimit 0x%08x\n",
noStretchValue, maximumLimit ));
else if ( !IS_PARANOID_VALIDATION )
return;
FT_INVALID_DATA;
}
static void
gxv_just_actSubrecord_type5_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
FT_UShort flags;
FT_UShort glyph;
GXV_LIMIT_CHECK( 2 + 2 );
flags = FT_NEXT_USHORT( p );
glyph = FT_NEXT_USHORT( p );
if ( flags )
GXV_TRACE(( "type5: nonzero value 0x%04x in unused flags\n",
flags ));
gxv_just_check_max_gid( glyph, "type5:glyph", gxvalid );
gxvalid->subtable_length = (FT_ULong)( p - table );
}
/* parse single actSubrecord */
static void
gxv_just_actSubrecord_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
FT_UShort actionClass;
FT_UShort actionType;
FT_ULong actionLength;
GXV_NAME_ENTER( "just actSubrecord" );
GXV_LIMIT_CHECK( 2 + 2 + 4 );
actionClass = FT_NEXT_USHORT( p );
actionType = FT_NEXT_USHORT( p );
actionLength = FT_NEXT_ULONG( p );
/* actionClass is related with justClass using 7bit only */
if ( ( actionClass & 0xFF80 ) != 0 )
GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
if ( actionType == 0 )
gxv_just_actSubrecord_type0_validate( p, limit, gxvalid );
else if ( actionType == 1 )
gxv_just_actSubrecord_type1_validate( p, limit, gxvalid );
else if ( actionType == 2 )
gxv_just_actSubrecord_type2_validate( p, limit, gxvalid );
else if ( actionType == 3 )
; /* Stretch glyph action: no actionData */
else if ( actionType == 4 )
gxv_just_actSubrecord_type4_validate( p, limit, gxvalid );
else if ( actionType == 5 )
gxv_just_actSubrecord_type5_validate( p, limit, gxvalid );
else
FT_INVALID_DATA;
gxvalid->subtable_length = actionLength;
GXV_EXIT;
}
static void
gxv_just_pcActionRecord_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
FT_ULong actionCount;
FT_ULong i;
GXV_LIMIT_CHECK( 4 );
actionCount = FT_NEXT_ULONG( p );
GXV_TRACE(( "actionCount = %d\n", actionCount ));
for ( i = 0; i < actionCount; i++ )
{
gxv_just_actSubrecord_validate( p, limit, gxvalid );
p += gxvalid->subtable_length;
}
gxvalid->subtable_length = (FT_ULong)( p - table );
GXV_EXIT;
}
static void
gxv_just_pcTable_LookupValue_entry_validate( FT_UShort glyph,
GXV_LookupValueCPtr value_p,
GXV_Validator gxvalid )
{
FT_UNUSED( glyph );
if ( value_p->u > GXV_JUST_DATA( pc_offset_max ) )
GXV_JUST_DATA( pc_offset_max ) = value_p->u;
if ( value_p->u < GXV_JUST_DATA( pc_offset_max ) )
GXV_JUST_DATA( pc_offset_min ) = value_p->u;
}
static void
gxv_just_pcLookupTable_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
GXV_NAME_ENTER( "just pcLookupTable" );
GXV_JUST_DATA( pc_offset_max ) = 0x0000;
GXV_JUST_DATA( pc_offset_min ) = 0xFFFFU;
gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
gxvalid->lookupval_func = gxv_just_pcTable_LookupValue_entry_validate;
gxv_LookupTable_validate( p, limit, gxvalid );
/* subtable_length is set by gxv_LookupTable_validate() */
GXV_EXIT;
}
static void
gxv_just_postcompTable_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
GXV_NAME_ENTER( "just postcompTable" );
gxv_just_pcLookupTable_validate( p, limit, gxvalid );
p += gxvalid->subtable_length;
gxv_just_pcActionRecord_validate( p, limit, gxvalid );
p += gxvalid->subtable_length;
gxvalid->subtable_length = (FT_ULong)( p - table );
GXV_EXIT;
}
static void
gxv_just_classTable_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
/* TODO: validate markClass & currentClass */
FT_UShort setMark;
FT_UShort dontAdvance;
FT_UShort markClass;
FT_UShort currentClass;
#endif
FT_UNUSED( state );
FT_UNUSED( glyphOffset_p );
FT_UNUSED( table );
FT_UNUSED( limit );
FT_UNUSED( gxvalid );
#ifndef GXV_LOAD_UNUSED_VARS
FT_UNUSED( flags );
#else
setMark = (FT_UShort)( ( flags >> 15 ) & 1 );
dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
markClass = (FT_UShort)( ( flags >> 7 ) & 0x7F );
currentClass = (FT_UShort)( flags & 0x7F );
#endif
}
static void
gxv_just_justClassTable_validate ( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
FT_UShort length;
FT_UShort coverage;
FT_ULong subFeatureFlags;
GXV_NAME_ENTER( "just justClassTable" );
GXV_LIMIT_CHECK( 2 + 2 + 4 );
length = FT_NEXT_USHORT( p );
coverage = FT_NEXT_USHORT( p );
subFeatureFlags = FT_NEXT_ULONG( p );
GXV_TRACE(( " justClassTable: coverage = 0x%04x (%s) ", coverage ));
if ( ( coverage & 0x4000 ) == 0 )
GXV_TRACE(( "ascending\n" ));
else
GXV_TRACE(( "descending\n" ));
if ( subFeatureFlags )
GXV_TRACE(( " justClassTable: nonzero value (0x%08x)"
" in unused subFeatureFlags\n", subFeatureFlags ));
gxvalid->statetable.optdata = NULL;
gxvalid->statetable.optdata_load_func = NULL;
gxvalid->statetable.subtable_setup_func = NULL;
gxvalid->statetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_NONE;
gxvalid->statetable.entry_validate_func =
gxv_just_classTable_entry_validate;
gxv_StateTable_validate( p, table + length, gxvalid );
/* subtable_length is set by gxv_LookupTable_validate() */
GXV_EXIT;
}
static void
gxv_just_wdcTable_LookupValue_validate( FT_UShort glyph,
GXV_LookupValueCPtr value_p,
GXV_Validator gxvalid )
{
FT_UNUSED( glyph );
if ( value_p->u > GXV_JUST_DATA( wdc_offset_max ) )
GXV_JUST_DATA( wdc_offset_max ) = value_p->u;
if ( value_p->u < GXV_JUST_DATA( wdc_offset_min ) )
GXV_JUST_DATA( wdc_offset_min ) = value_p->u;
}
static void
gxv_just_justData_lookuptable_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
FT_Bytes p = table;
GXV_JUST_DATA( wdc_offset_max ) = 0x0000;
GXV_JUST_DATA( wdc_offset_min ) = 0xFFFFU;
gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
gxvalid->lookupval_func = gxv_just_wdcTable_LookupValue_validate;
gxv_LookupTable_validate( p, limit, gxvalid );
/* subtable_length is set by gxv_LookupTable_validate() */
GXV_EXIT;
}
/*
* gxv_just_justData_validate() parses and validates horizData, vertData.
*/
static void
gxv_just_justData_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator gxvalid )
{
/*
* following 3 offsets are measured from the start of `just'
* (which table points to), not justData
*/
FT_UShort justClassTableOffset;
FT_UShort wdcTableOffset;
FT_UShort pcTableOffset;
FT_Bytes p = table;
GXV_ODTECT( 4, odtect );
GXV_NAME_ENTER( "just justData" );
GXV_ODTECT_INIT( odtect );
GXV_LIMIT_CHECK( 2 + 2 + 2 );
justClassTableOffset = FT_NEXT_USHORT( p );
wdcTableOffset = FT_NEXT_USHORT( p );
pcTableOffset = FT_NEXT_USHORT( p );
GXV_TRACE(( " (justClassTableOffset = 0x%04x)\n", justClassTableOffset ));
GXV_TRACE(( " (wdcTableOffset = 0x%04x)\n", wdcTableOffset ));
GXV_TRACE(( " (pcTableOffset = 0x%04x)\n", pcTableOffset ));
gxv_just_justData_lookuptable_validate( p, limit, gxvalid );
gxv_odtect_add_range( p, gxvalid->subtable_length,
"just_LookupTable", odtect );
if ( wdcTableOffset )
{
gxv_just_widthDeltaClusters_validate(
gxvalid->root->base + wdcTableOffset, limit, gxvalid );
gxv_odtect_add_range( gxvalid->root->base + wdcTableOffset,
gxvalid->subtable_length, "just_wdcTable", odtect );
}
if ( pcTableOffset )
{
gxv_just_postcompTable_validate( gxvalid->root->base + pcTableOffset,
limit, gxvalid );
gxv_odtect_add_range( gxvalid->root->base + pcTableOffset,
gxvalid->subtable_length, "just_pcTable", odtect );
}
if ( justClassTableOffset )
{
gxv_just_justClassTable_validate(
gxvalid->root->base + justClassTableOffset, limit, gxvalid );
gxv_odtect_add_range( gxvalid->root->base + justClassTableOffset,
gxvalid->subtable_length, "just_justClassTable",
odtect );
}
gxv_odtect_validate( odtect, gxvalid );
GXV_EXIT;
}
FT_LOCAL_DEF( void )
gxv_just_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_just_DataRec justrec;
GXV_just_Data just = &justrec;
FT_ULong version;
FT_UShort format;
FT_UShort horizOffset;
FT_UShort vertOffset;
GXV_ODTECT( 3, odtect );
GXV_ODTECT_INIT( odtect );
gxvalid->root = ftvalid;
gxvalid->table_data = just;
gxvalid->face = face;
FT_TRACE3(( "validating `just' table\n" ));
GXV_INIT;
limit = gxvalid->root->limit;
GXV_LIMIT_CHECK( 4 + 2 + 2 + 2 );
version = FT_NEXT_ULONG( p );
format = FT_NEXT_USHORT( p );
horizOffset = FT_NEXT_USHORT( p );
vertOffset = FT_NEXT_USHORT( p );
gxv_odtect_add_range( table, (FT_ULong)( p - table ),
"just header", odtect );
/* Version 1.0 (always:2000) */
GXV_TRACE(( " (version = 0x%08x)\n", version ));
if ( version != 0x00010000UL )
FT_INVALID_FORMAT;
/* format 0 (always:2000) */
GXV_TRACE(( " (format = 0x%04x)\n", format ));
if ( format != 0x0000 )
FT_INVALID_FORMAT;
GXV_TRACE(( " (horizOffset = %d)\n", horizOffset ));
GXV_TRACE(( " (vertOffset = %d)\n", vertOffset ));
/* validate justData */
if ( 0 < horizOffset )
{
gxv_just_justData_validate( table + horizOffset, limit, gxvalid );
gxv_odtect_add_range( table + horizOffset, gxvalid->subtable_length,
"horizJustData", odtect );
}
if ( 0 < vertOffset )
{
gxv_just_justData_validate( table + vertOffset, limit, gxvalid );
gxv_odtect_add_range( table + vertOffset, gxvalid->subtable_length,
"vertJustData", odtect );
}
gxv_odtect_validate( odtect, gxvalid );
FT_TRACE4(( "\n" ));
}
/* END */