242 lines
9.5 KiB
C
242 lines
9.5 KiB
C
|
/***************************************************************************/
|
||
|
/* */
|
||
|
/* gxvmorx2.c */
|
||
|
/* */
|
||
|
/* TrueTypeGX/AAT morx table validation */
|
||
|
/* body for type2 (Ligature 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 "gxvmorx.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_gxvmorx
|
||
|
|
||
|
|
||
|
typedef struct GXV_morx_subtable_type2_StateOptRec_
|
||
|
{
|
||
|
FT_ULong ligActionTable;
|
||
|
FT_ULong componentTable;
|
||
|
FT_ULong ligatureTable;
|
||
|
FT_ULong ligActionTable_length;
|
||
|
FT_ULong componentTable_length;
|
||
|
FT_ULong ligatureTable_length;
|
||
|
|
||
|
} GXV_morx_subtable_type2_StateOptRec,
|
||
|
*GXV_morx_subtable_type2_StateOptRecData;
|
||
|
|
||
|
#define GXV_MORX_SUBTABLE_TYPE2_HEADER_SIZE ( GXV_XSTATETABLE_HEADER_SIZE + 4 + 4 + 4 )
|
||
|
|
||
|
static void
|
||
|
gxv_morx_subtable_type2_opttable_load( FT_Bytes table,
|
||
|
FT_Bytes limit,
|
||
|
GXV_Validator valid )
|
||
|
{
|
||
|
FT_Bytes p = table;
|
||
|
GXV_morx_subtable_type2_StateOptRecData optdata = valid->xstatetable.optdata;
|
||
|
|
||
|
GXV_LIMIT_CHECK( 4 + 4 + 4 );
|
||
|
optdata->ligActionTable = FT_NEXT_ULONG( p );
|
||
|
optdata->componentTable = FT_NEXT_ULONG( p );
|
||
|
optdata->ligatureTable = FT_NEXT_ULONG( p );
|
||
|
|
||
|
GXV_TRACE(( "offset to ligActionTable=0x%08x\n", optdata->ligActionTable ));
|
||
|
GXV_TRACE(( "offset to componentTable=0x%08x\n", optdata->componentTable ));
|
||
|
GXV_TRACE(( "offset to ligatureTable=0x%08x\n", optdata->ligatureTable ));
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
gxv_morx_subtable_type2_subtable_setup( FT_ULong table_size,
|
||
|
FT_ULong classTable,
|
||
|
FT_ULong stateArray,
|
||
|
FT_ULong entryTable,
|
||
|
FT_ULong* classTable_length_p,
|
||
|
FT_ULong* stateArray_length_p,
|
||
|
FT_ULong* entryTable_length_p,
|
||
|
GXV_Validator valid )
|
||
|
{
|
||
|
FT_ULong o[6];
|
||
|
FT_ULong* l[6];
|
||
|
FT_ULong buff[7];
|
||
|
GXV_morx_subtable_type2_StateOptRecData optdata = valid->xstatetable.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_ulong_offset( o, l, buff, 6, table_size, valid );
|
||
|
|
||
|
GXV_TRACE(( "classTable: offset=0x%08x length=0x%08x\n",
|
||
|
classTable, *classTable_length_p));
|
||
|
GXV_TRACE(( "stateArray: offset=0x%08x length=0x%08x\n",
|
||
|
stateArray, *stateArray_length_p));
|
||
|
GXV_TRACE(( "entryTable: offset=0x%08x length=0x%08x\n",
|
||
|
entryTable, *entryTable_length_p));
|
||
|
GXV_TRACE(( "ligActionTable: offset=0x%08x length=0x%08x\n",
|
||
|
optdata->ligActionTable,
|
||
|
optdata->ligActionTable_length));
|
||
|
GXV_TRACE(( "componentTable: offset=0x%08x length=0x%08x\n",
|
||
|
optdata->componentTable,
|
||
|
optdata->componentTable_length));
|
||
|
GXV_TRACE(( "ligatureTable: offset=0x%08x length=0x%08x\n",
|
||
|
optdata->ligatureTable,
|
||
|
optdata->ligatureTable_length));
|
||
|
GXV_EXIT;
|
||
|
}
|
||
|
|
||
|
#define GXV_MORX_LIGACTION_ENTRY_SIZE 4
|
||
|
|
||
|
|
||
|
static void
|
||
|
gxv_morx_subtable_type2_ligActionIndex_validate( FT_Bytes table,
|
||
|
FT_UShort ligActionIndex,
|
||
|
GXV_Validator valid )
|
||
|
{
|
||
|
/* access ligActionTable */
|
||
|
GXV_morx_subtable_type2_StateOptRecData optdata = valid->xstatetable.optdata;
|
||
|
FT_Bytes lat_base = table + optdata->ligActionTable;
|
||
|
FT_Bytes p = lat_base + ligActionIndex * GXV_MORX_LIGACTION_ENTRY_SIZE;
|
||
|
FT_Bytes lat_limit = lat_base + optdata->ligActionTable;
|
||
|
|
||
|
|
||
|
if ( p < lat_base )
|
||
|
{
|
||
|
GXV_TRACE(( "p < lat_base (%d byte rewind)\n", lat_base - p ));
|
||
|
FT_INVALID_OFFSET;
|
||
|
}
|
||
|
else if ( lat_limit < p )
|
||
|
{
|
||
|
GXV_TRACE(( "lat_limit < p (%d byte overrun)\n", p - lat_limit ));
|
||
|
FT_INVALID_OFFSET;
|
||
|
}
|
||
|
|
||
|
{
|
||
|
/* validate entry in ligActionTable */
|
||
|
FT_ULong lig_action;
|
||
|
FT_UShort last;
|
||
|
FT_UShort store;
|
||
|
FT_ULong offset;
|
||
|
|
||
|
|
||
|
lig_action = FT_NEXT_ULONG( p );
|
||
|
last = (lig_action & 0x80000000) / 0x80000000;
|
||
|
store = (lig_action & 0x40000000) / 0x40000000;
|
||
|
offset = lig_action & 0x3FFFFFFF;
|
||
|
|
||
|
}
|
||
|
}
|
||
|
|
||
|
|
||
|
static void
|
||
|
gxv_morx_subtable_type2_entry_validate( FT_UShort state,
|
||
|
FT_UShort flags,
|
||
|
GXV_StateTable_GlyphOffsetDesc
|
||
|
glyphOffset,
|
||
|
FT_Bytes table,
|
||
|
FT_Bytes limit,
|
||
|
GXV_Validator valid )
|
||
|
{
|
||
|
FT_UShort setComponent;
|
||
|
FT_UShort dontAdvance;
|
||
|
FT_UShort performAction;
|
||
|
FT_UShort reserved;
|
||
|
FT_UShort ligActionIndex;
|
||
|
|
||
|
setComponent = ( flags & 0x8000 ) / 0x8000;
|
||
|
dontAdvance = ( flags & 0x4000 ) / 0x4000;
|
||
|
performAction = ( flags & 0x2000 ) / 0x2000;
|
||
|
reserved = flags & 0x1FFF;
|
||
|
ligActionIndex = glyphOffset.u;
|
||
|
|
||
|
if ( reserved > 0 )
|
||
|
GXV_TRACE(( " reserved 14bit is non-zero\n" ));
|
||
|
|
||
|
if ( 0 < ligActionIndex )
|
||
|
gxv_morx_subtable_type2_ligActionIndex_validate( table, ligActionIndex, valid );
|
||
|
}
|
||
|
|
||
|
|
||
|
static void
|
||
|
gxv_morx_subtable_type2_ligatureTable_validate( FT_Bytes table,
|
||
|
GXV_Validator valid )
|
||
|
{
|
||
|
GXV_morx_subtable_type2_StateOptRecData optdata = valid->xstatetable.optdata;
|
||
|
FT_Bytes p = table + optdata->ligatureTable;
|
||
|
FT_Bytes limit = table + optdata->ligatureTable
|
||
|
+ optdata->ligatureTable_length;
|
||
|
|
||
|
GXV_NAME_ENTER( "morx 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 );
|
||
|
}
|
||
|
}
|
||
|
GXV_EXIT;
|
||
|
}
|
||
|
|
||
|
|
||
|
static void
|
||
|
gxv_morx_subtable_type2_validate( FT_Bytes table,
|
||
|
FT_Bytes limit,
|
||
|
GXV_Validator valid )
|
||
|
{
|
||
|
FT_Bytes p = table;
|
||
|
GXV_morx_subtable_type2_StateOptRec lig_rec;
|
||
|
|
||
|
GXV_NAME_ENTER( "morx chain subtable type2 (Ligature Substitution)" );
|
||
|
|
||
|
GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE );
|
||
|
|
||
|
valid->xstatetable.optdata = &lig_rec;
|
||
|
valid->xstatetable.optdata_load_func = gxv_morx_subtable_type2_opttable_load;
|
||
|
valid->xstatetable.subtable_setup_func = gxv_morx_subtable_type2_subtable_setup;
|
||
|
valid->xstatetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_USHORT;
|
||
|
valid->xstatetable.entry_validate_func = gxv_morx_subtable_type2_entry_validate;
|
||
|
gxv_XStateTable_validate( p, limit, valid );
|
||
|
p += valid->subtable_length;
|
||
|
gxv_morx_subtable_type2_ligatureTable_validate( table, valid );
|
||
|
GXV_EXIT;
|
||
|
}
|
||
|
|
||
|
|
||
|
/* END */
|