/***************************************************************************/ | |
/* */ | |
/* gxvmort2.c */ | |
/* */ | |
/* TrueTypeGX/AAT mort table validation */ | |
/* body for type2 (Ligature Substitution) subtable. */ | |
/* */ | |
/* Copyright 2005-2015 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 "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_type2_StateOptRec_ | |
{ | |
FT_UShort ligActionTable; | |
FT_UShort componentTable; | |
FT_UShort ligatureTable; | |
FT_UShort ligActionTable_length; | |
FT_UShort componentTable_length; | |
FT_UShort ligatureTable_length; | |
} GXV_mort_subtable_type2_StateOptRec, | |
*GXV_mort_subtable_type2_StateOptRecData; | |
#define GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE \ | |
( GXV_STATETABLE_HEADER_SIZE + 2 + 2 + 2 ) | |
static void | |
gxv_mort_subtable_type2_opttable_load( FT_Bytes table, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = table; | |
GXV_mort_subtable_type2_StateOptRecData optdata = | |
(GXV_mort_subtable_type2_StateOptRecData)gxvalid->statetable.optdata; | |
GXV_LIMIT_CHECK( 2 + 2 + 2 ); | |
optdata->ligActionTable = FT_NEXT_USHORT( p ); | |
optdata->componentTable = FT_NEXT_USHORT( p ); | |
optdata->ligatureTable = FT_NEXT_USHORT( p ); | |
GXV_TRACE(( "offset to ligActionTable=0x%04x\n", | |
optdata->ligActionTable )); | |
GXV_TRACE(( "offset to componentTable=0x%04x\n", | |
optdata->componentTable )); | |
GXV_TRACE(( "offset to ligatureTable=0x%04x\n", | |
optdata->ligatureTable )); | |
} | |
static void | |
gxv_mort_subtable_type2_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 gxvalid ) | |
{ | |
FT_UShort o[6]; | |
FT_UShort *l[6]; | |
FT_UShort buff[7]; | |
GXV_mort_subtable_type2_StateOptRecData optdata = | |
(GXV_mort_subtable_type2_StateOptRecData)gxvalid->statetable.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_ushort_offset( o, l, buff, 6, table_size, gxvalid ); | |
GXV_TRACE(( "classTable: offset=0x%04x length=0x%04x\n", | |
classTable, *classTable_length_p )); | |
GXV_TRACE(( "stateArray: offset=0x%04x length=0x%04x\n", | |
stateArray, *stateArray_length_p )); | |
GXV_TRACE(( "entryTable: offset=0x%04x length=0x%04x\n", | |
entryTable, *entryTable_length_p )); | |
GXV_TRACE(( "ligActionTable: offset=0x%04x length=0x%04x\n", | |
optdata->ligActionTable, | |
optdata->ligActionTable_length )); | |
GXV_TRACE(( "componentTable: offset=0x%04x length=0x%04x\n", | |
optdata->componentTable, | |
optdata->componentTable_length )); | |
GXV_TRACE(( "ligatureTable: offset=0x%04x length=0x%04x\n", | |
optdata->ligatureTable, | |
optdata->ligatureTable_length )); | |
GXV_EXIT; | |
} | |
static void | |
gxv_mort_subtable_type2_ligActionOffset_validate( | |
FT_Bytes table, | |
FT_UShort ligActionOffset, | |
GXV_Validator gxvalid ) | |
{ | |
/* access ligActionTable */ | |
GXV_mort_subtable_type2_StateOptRecData optdata = | |
(GXV_mort_subtable_type2_StateOptRecData)gxvalid->statetable.optdata; | |
FT_Bytes lat_base = table + optdata->ligActionTable; | |
FT_Bytes p = table + ligActionOffset; | |
FT_Bytes lat_limit = lat_base + optdata->ligActionTable; | |
GXV_32BIT_ALIGNMENT_VALIDATE( ligActionOffset ); | |
if ( p < lat_base ) | |
{ | |
GXV_TRACE(( "too short offset 0x%04x: p < lat_base (%d byte rewind)\n", | |
ligActionOffset, lat_base - p )); | |
/* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */ | |
GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET ); | |
} | |
else if ( lat_limit < p ) | |
{ | |
GXV_TRACE(( "too large offset 0x%04x: lat_limit < p (%d byte overrun)\n", | |
ligActionOffset, p - lat_limit )); | |
/* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */ | |
GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET ); | |
} | |
else | |
{ | |
/* validate entry in ligActionTable */ | |
FT_ULong lig_action; | |
#ifdef GXV_LOAD_UNUSED_VARS | |
FT_UShort last; | |
FT_UShort store; | |
#endif | |
FT_ULong offset; | |
lig_action = FT_NEXT_ULONG( p ); | |
#ifdef GXV_LOAD_UNUSED_VARS | |
last = (FT_UShort)( ( lig_action >> 31 ) & 1 ); | |
store = (FT_UShort)( ( lig_action >> 30 ) & 1 ); | |
#endif | |
/* Apple spec defines this offset as a word offset */ | |
offset = lig_action & 0x3FFFFFFFUL; | |
if ( offset * 2 < optdata->ligatureTable ) | |
{ | |
GXV_TRACE(( "too short offset 0x%08x:" | |
" 2 x offset < ligatureTable (%d byte rewind)\n", | |
offset, optdata->ligatureTable - offset * 2 )); | |
GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET ); | |
} else if ( offset * 2 > | |
optdata->ligatureTable + optdata->ligatureTable_length ) | |
{ | |
GXV_TRACE(( "too long offset 0x%08x:" | |
" 2 x offset > ligatureTable + ligatureTable_length" | |
" (%d byte overrun)\n", | |
offset, | |
optdata->ligatureTable + optdata->ligatureTable_length | |
- offset * 2 )); | |
GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET ); | |
} | |
} | |
} | |
static void | |
gxv_mort_subtable_type2_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 | |
FT_UShort setComponent; | |
FT_UShort dontAdvance; | |
#endif | |
FT_UShort offset; | |
FT_UNUSED( state ); | |
FT_UNUSED( glyphOffset_p ); | |
FT_UNUSED( limit ); | |
#ifdef GXV_LOAD_UNUSED_VARS | |
setComponent = (FT_UShort)( ( flags >> 15 ) & 1 ); | |
dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); | |
#endif | |
offset = (FT_UShort)( flags & 0x3FFFU ); | |
if ( 0 < offset ) | |
gxv_mort_subtable_type2_ligActionOffset_validate( table, offset, | |
gxvalid ); | |
} | |
static void | |
gxv_mort_subtable_type2_ligatureTable_validate( FT_Bytes table, | |
GXV_Validator gxvalid ) | |
{ | |
GXV_mort_subtable_type2_StateOptRecData optdata = | |
(GXV_mort_subtable_type2_StateOptRecData)gxvalid->statetable.optdata; | |
FT_Bytes p = table + optdata->ligatureTable; | |
FT_Bytes limit = table + optdata->ligatureTable | |
+ optdata->ligatureTable_length; | |
GXV_NAME_ENTER( "mort 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 ); | |
if ( gxvalid->face->num_glyphs < lig_gid ) | |
GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID ); | |
} | |
} | |
GXV_EXIT; | |
} | |
FT_LOCAL_DEF( void ) | |
gxv_mort_subtable_type2_validate( FT_Bytes table, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = table; | |
GXV_mort_subtable_type2_StateOptRec lig_rec; | |
GXV_NAME_ENTER( "mort chain subtable type2 (Ligature Substitution)" ); | |
GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE ); | |
gxvalid->statetable.optdata = | |
&lig_rec; | |
gxvalid->statetable.optdata_load_func = | |
gxv_mort_subtable_type2_opttable_load; | |
gxvalid->statetable.subtable_setup_func = | |
gxv_mort_subtable_type2_subtable_setup; | |
gxvalid->statetable.entry_glyphoffset_fmt = | |
GXV_GLYPHOFFSET_NONE; | |
gxvalid->statetable.entry_validate_func = | |
gxv_mort_subtable_type2_entry_validate; | |
gxv_StateTable_validate( p, limit, gxvalid ); | |
p += gxvalid->subtable_length; | |
gxv_mort_subtable_type2_ligatureTable_validate( table, gxvalid ); | |
gxvalid->subtable_length = (FT_ULong)( p - table ); | |
GXV_EXIT; | |
} | |
/* END */ |