227 lines
9.0 KiB
C
227 lines
9.0 KiB
C
|
/***************************************************************************/
|
||
|
|
/* */
|
||
|
|
/* gxvmort1.c */
|
||
|
|
/* */
|
||
|
|
/* TrueTypeGX/AAT mort table validation */
|
||
|
|
/* body for type1 (Contextual Substitution) subtable. */
|
||
|
|
/* */
|
||
|
|
/* Copyright 2005 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 was support of 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_type1_StateOptRec_
|
||
|
|
{
|
||
|
|
FT_UShort substitutionTable;
|
||
|
|
FT_UShort substitutionTable_length;
|
||
|
|
|
||
|
|
} GXV_mort_subtable_type1_StateOptRec,
|
||
|
|
*GXV_mort_subtable_type1_StateOptRecData;
|
||
|
|
|
||
|
|
#define GXV_MORT_SUBTABLE_TYPE1_HEADER_SIZE ( GXV_STATETABLE_HEADER_SIZE + 2 )
|
||
|
|
|
||
|
|
static void
|
||
|
|
gxv_mort_subtable_type1_substitutionTable_load( FT_Bytes table,
|
||
|
|
FT_Bytes limit,
|
||
|
|
GXV_Validator valid )
|
||
|
|
{
|
||
|
|
FT_Bytes p = table;
|
||
|
|
GXV_mort_subtable_type1_StateOptRecData optdata = valid->statetable.optdata;
|
||
|
|
|
||
|
|
|
||
|
|
GXV_LIMIT_CHECK( 2 );
|
||
|
|
optdata->substitutionTable = FT_NEXT_USHORT( p );
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void
|
||
|
|
gxv_mort_subtable_type1_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 valid )
|
||
|
|
{
|
||
|
|
FT_UShort o[4];
|
||
|
|
FT_UShort *l[4];
|
||
|
|
FT_UShort buff[5];
|
||
|
|
GXV_mort_subtable_type1_StateOptRecData optdata = valid->statetable.optdata;
|
||
|
|
|
||
|
|
|
||
|
|
o[0] = classTable;
|
||
|
|
o[1] = stateArray;
|
||
|
|
o[2] = entryTable;
|
||
|
|
o[3] = optdata->substitutionTable;
|
||
|
|
l[0] = classTable_length_p;
|
||
|
|
l[1] = stateArray_length_p;
|
||
|
|
l[2] = entryTable_length_p;
|
||
|
|
l[3] = &(optdata->substitutionTable_length);
|
||
|
|
|
||
|
|
gxv_set_length_by_ushort_offset( o, l, buff, 4, table_size, valid );
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void
|
||
|
|
gxv_mort_subtable_type1_offset_to_subst_validate( FT_Short wordOffset,
|
||
|
|
FT_String* tag,
|
||
|
|
FT_Byte state,
|
||
|
|
GXV_Validator valid )
|
||
|
|
{
|
||
|
|
FT_UShort substTable;
|
||
|
|
FT_UShort substTable_limit;
|
||
|
|
FT_UShort min_gid;
|
||
|
|
FT_UShort max_gid;
|
||
|
|
|
||
|
|
substTable = ((GXV_mort_subtable_type1_StateOptRec *)
|
||
|
|
(valid->statetable.optdata))->substitutionTable;
|
||
|
|
substTable_limit = substTable +
|
||
|
|
((GXV_mort_subtable_type1_StateOptRec *)
|
||
|
|
(valid->statetable.optdata))->substitutionTable_length;
|
||
|
|
|
||
|
|
min_gid = ( substTable - ( wordOffset * 2 ) ) / 2;
|
||
|
|
max_gid = ( substTable_limit - ( wordOffset * 2 ) ) / 2;
|
||
|
|
max_gid = FT_MAX( max_gid, valid->face->num_glyphs );
|
||
|
|
|
||
|
|
/* TODO: min_gid & max_gid comparison with ClassTable contents */
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void
|
||
|
|
gxv_mort_subtable_type1_entry_validate( FT_Byte state,
|
||
|
|
FT_UShort flags,
|
||
|
|
GXV_StateTable_GlyphOffsetDesc glyphOffset,
|
||
|
|
FT_Bytes table,
|
||
|
|
FT_Bytes limit,
|
||
|
|
GXV_Validator valid )
|
||
|
|
{
|
||
|
|
FT_UShort setMark;
|
||
|
|
FT_UShort dontAdvance;
|
||
|
|
FT_UShort reserved;
|
||
|
|
FT_Short markOffset;
|
||
|
|
FT_Short currentOffset;
|
||
|
|
|
||
|
|
|
||
|
|
setMark = flags / 0x8000;
|
||
|
|
dontAdvance = ( flags & 0x4000 ) / 0x4000;
|
||
|
|
reserved = flags & 0x3FFF;
|
||
|
|
markOffset = GXV_USHORT_TO_SHORT( glyphOffset.ul / 0x00010000 );
|
||
|
|
currentOffset = GXV_USHORT_TO_SHORT( glyphOffset.ul & 0x0000FFFF );
|
||
|
|
|
||
|
|
if ( 0 < reserved )
|
||
|
|
{
|
||
|
|
GXV_TRACE(( " non-zero bits found in reserved range\n" ));
|
||
|
|
if ( valid->root->level >= FT_VALIDATE_PARANOID )
|
||
|
|
FT_INVALID_DATA;
|
||
|
|
}
|
||
|
|
|
||
|
|
gxv_mort_subtable_type1_offset_to_subst_validate( markOffset,
|
||
|
|
"markOffset",
|
||
|
|
state,
|
||
|
|
valid );
|
||
|
|
|
||
|
|
gxv_mort_subtable_type1_offset_to_subst_validate( currentOffset,
|
||
|
|
"currentOffset",
|
||
|
|
state,
|
||
|
|
valid );
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
gxv_mort_subtable_type1_substTable_validate( FT_Bytes table,
|
||
|
|
FT_Bytes limit,
|
||
|
|
GXV_Validator valid )
|
||
|
|
{
|
||
|
|
FT_Bytes p = table;
|
||
|
|
FT_UShort num_gids = ((GXV_mort_subtable_type1_StateOptRec *)
|
||
|
|
(valid->statetable.optdata))->substitutionTable_length
|
||
|
|
/ 2;
|
||
|
|
FT_UShort i;
|
||
|
|
|
||
|
|
|
||
|
|
GXV_NAME_ENTER(( "validate contents in substitionTable" ));
|
||
|
|
for ( i = 0; i < num_gids ; i ++ )
|
||
|
|
{
|
||
|
|
FT_UShort dst_gid;
|
||
|
|
|
||
|
|
|
||
|
|
GXV_LIMIT_CHECK( 2 );
|
||
|
|
dst_gid = FT_NEXT_USHORT( p );
|
||
|
|
|
||
|
|
if ( dst_gid >= 0xFFFF )
|
||
|
|
continue;
|
||
|
|
|
||
|
|
if ( dst_gid > valid->face->num_glyphs )
|
||
|
|
{
|
||
|
|
GXV_TRACE(( "substTable include too-large gid[%d]=%d > max defined gid #%d\n",
|
||
|
|
i, dst_gid, valid->face->num_glyphs ));
|
||
|
|
if ( valid->root->level >= FT_VALIDATE_PARANOID )
|
||
|
|
FT_INVALID_GLYPH_ID;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
GXV_EXIT;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* subtable for Contextual glyph substition is modified StateTable.
|
||
|
|
* In addition classTable, stateArray, entryTable, "substitutionTable"
|
||
|
|
* is added.
|
||
|
|
*/
|
||
|
|
static void
|
||
|
|
gxv_mort_subtable_type1_validate( FT_Bytes table,
|
||
|
|
FT_Bytes limit,
|
||
|
|
GXV_Validator valid )
|
||
|
|
{
|
||
|
|
FT_Bytes p = table;
|
||
|
|
GXV_mort_subtable_type1_StateOptRec st_rec;
|
||
|
|
|
||
|
|
|
||
|
|
GXV_NAME_ENTER( "mort chain subtable type1 (Contextual Glyph Subst)" );
|
||
|
|
|
||
|
|
GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE1_HEADER_SIZE );
|
||
|
|
|
||
|
|
valid->statetable.optdata = &st_rec;
|
||
|
|
valid->statetable.optdata_load_func = gxv_mort_subtable_type1_substitutionTable_load;
|
||
|
|
valid->statetable.subtable_setup_func = gxv_mort_subtable_type1_subtable_setup;
|
||
|
|
valid->statetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_ULONG;
|
||
|
|
valid->statetable.entry_validate_func = gxv_mort_subtable_type1_entry_validate;
|
||
|
|
gxv_StateTable_validate( p, limit, valid );
|
||
|
|
|
||
|
|
gxv_mort_subtable_type1_substTable_validate( table
|
||
|
|
+ st_rec.substitutionTable,
|
||
|
|
table
|
||
|
|
+ st_rec.substitutionTable
|
||
|
|
+ st_rec.substitutionTable_length,
|
||
|
|
valid );
|
||
|
|
|
||
|
|
GXV_EXIT;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* END */
|