| /**************************************************************************** |
| * |
| * gxvmorx5.c |
| * |
| * TrueTypeGX/AAT morx table validation |
| * body for type5 (Contextual Glyph Insertion) subtable. |
| * |
| * 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 "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 gxvmorx |
| |
| |
| /* |
| * `morx' subtable type5 (Contextual Glyph Insertion) |
| * has format of a StateTable with insertion-glyph-list |
| * without name. However, the 32bit offset from the head |
| * of subtable to the i-g-l is given after `entryTable', |
| * without variable name specification (the existence of |
| * this offset to the table is different from mort type5). |
| */ |
| |
| |
| typedef struct GXV_morx_subtable_type5_StateOptRec_ |
| { |
| FT_ULong insertionGlyphList; |
| FT_ULong insertionGlyphList_length; |
| |
| } GXV_morx_subtable_type5_StateOptRec, |
| *GXV_morx_subtable_type5_StateOptRecData; |
| |
| |
| #define GXV_MORX_SUBTABLE_TYPE5_HEADER_SIZE \ |
| ( GXV_STATETABLE_HEADER_SIZE + 4 ) |
| |
| |
| static void |
| gxv_morx_subtable_type5_insertionGlyphList_load( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table; |
| |
| GXV_morx_subtable_type5_StateOptRecData optdata = |
| (GXV_morx_subtable_type5_StateOptRecData)gxvalid->xstatetable.optdata; |
| |
| |
| GXV_LIMIT_CHECK( 4 ); |
| optdata->insertionGlyphList = FT_NEXT_ULONG( p ); |
| } |
| |
| |
| static void |
| gxv_morx_subtable_type5_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 gxvalid ) |
| { |
| FT_ULong o[4]; |
| FT_ULong* l[4]; |
| FT_ULong buff[5]; |
| |
| GXV_morx_subtable_type5_StateOptRecData optdata = |
| (GXV_morx_subtable_type5_StateOptRecData)gxvalid->xstatetable.optdata; |
| |
| |
| o[0] = classTable; |
| o[1] = stateArray; |
| o[2] = entryTable; |
| o[3] = optdata->insertionGlyphList; |
| l[0] = classTable_length_p; |
| l[1] = stateArray_length_p; |
| l[2] = entryTable_length_p; |
| l[3] = &(optdata->insertionGlyphList_length); |
| |
| gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, gxvalid ); |
| } |
| |
| |
| static void |
| gxv_morx_subtable_type5_InsertList_validate( FT_UShort table_index, |
| FT_UShort count, |
| FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table + table_index * 2; |
| |
| |
| #ifndef GXV_LOAD_TRACE_VARS |
| GXV_LIMIT_CHECK( count * 2 ); |
| #else |
| while ( p < table + count * 2 + table_index * 2 ) |
| { |
| FT_UShort insert_glyphID; |
| |
| |
| GXV_LIMIT_CHECK( 2 ); |
| insert_glyphID = FT_NEXT_USHORT( p ); |
| GXV_TRACE(( " 0x%04x", insert_glyphID )); |
| } |
| |
| GXV_TRACE(( "\n" )); |
| #endif |
| } |
| |
| |
| static void |
| gxv_morx_subtable_type5_entry_validate( |
| FT_UShort state, |
| FT_UShort flags, |
| GXV_StateTable_GlyphOffsetCPtr glyphOffset_p, |
| FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| #ifdef GXV_LOAD_UNUSED_VARS |
| FT_Bool setMark; |
| FT_Bool dontAdvance; |
| FT_Bool currentIsKashidaLike; |
| FT_Bool markedIsKashidaLike; |
| FT_Bool currentInsertBefore; |
| FT_Bool markedInsertBefore; |
| #endif |
| FT_Byte currentInsertCount; |
| FT_Byte markedInsertCount; |
| FT_Byte currentInsertList; |
| FT_UShort markedInsertList; |
| |
| FT_UNUSED( state ); |
| |
| |
| #ifdef GXV_LOAD_UNUSED_VARS |
| setMark = FT_BOOL( ( flags >> 15 ) & 1 ); |
| dontAdvance = FT_BOOL( ( flags >> 14 ) & 1 ); |
| currentIsKashidaLike = FT_BOOL( ( flags >> 13 ) & 1 ); |
| markedIsKashidaLike = FT_BOOL( ( flags >> 12 ) & 1 ); |
| currentInsertBefore = FT_BOOL( ( flags >> 11 ) & 1 ); |
| markedInsertBefore = FT_BOOL( ( flags >> 10 ) & 1 ); |
| #endif |
| |
| currentInsertCount = (FT_Byte)( ( flags >> 5 ) & 0x1F ); |
| markedInsertCount = (FT_Byte)( flags & 0x001F ); |
| |
| currentInsertList = (FT_Byte) ( glyphOffset_p->ul >> 16 ); |
| markedInsertList = (FT_UShort)( glyphOffset_p->ul ); |
| |
| if ( currentInsertList && 0 != currentInsertCount ) |
| gxv_morx_subtable_type5_InsertList_validate( currentInsertList, |
| currentInsertCount, |
| table, limit, |
| gxvalid ); |
| |
| if ( markedInsertList && 0 != markedInsertCount ) |
| gxv_morx_subtable_type5_InsertList_validate( markedInsertList, |
| markedInsertCount, |
| table, limit, |
| gxvalid ); |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| gxv_morx_subtable_type5_validate( FT_Bytes table, |
| FT_Bytes limit, |
| GXV_Validator gxvalid ) |
| { |
| FT_Bytes p = table; |
| |
| GXV_morx_subtable_type5_StateOptRec et_rec; |
| GXV_morx_subtable_type5_StateOptRecData et = &et_rec; |
| |
| |
| GXV_NAME_ENTER( "morx chain subtable type5 (Glyph Insertion)" ); |
| |
| GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE5_HEADER_SIZE ); |
| |
| gxvalid->xstatetable.optdata = |
| et; |
| gxvalid->xstatetable.optdata_load_func = |
| gxv_morx_subtable_type5_insertionGlyphList_load; |
| gxvalid->xstatetable.subtable_setup_func = |
| gxv_morx_subtable_type5_subtable_setup; |
| gxvalid->xstatetable.entry_glyphoffset_fmt = |
| GXV_GLYPHOFFSET_ULONG; |
| gxvalid->xstatetable.entry_validate_func = |
| gxv_morx_subtable_type5_entry_validate; |
| |
| gxv_XStateTable_validate( p, limit, gxvalid ); |
| |
| GXV_EXIT; |
| } |
| |
| |
| /* END */ |