From 6da023d1ff9b70f78c900774cc5d362af53ad92c Mon Sep 17 00:00:00 2001 From: Werner Lemberg Date: Thu, 20 May 2010 15:38:00 +0200 Subject: TrueType: Make FreeType ignore maxSizeOfInstructions in `maxp'. Acroread does the same. * src/truetype/ttgload.c (TT_Process_Composite_Glyph): Call `Update_Max' to adjust size of instructions array if necessary and add a rough safety check. (load_truetype_glyph): Save `loader->byte_len' before recursive call. * src/truetype/ttinterp.h, src/truetype/ttinterp.c (Update_Max): Declare it as FT_LOCAL. --- src/truetype/ttgload.c | 30 ++++++++++++++++++++++++------ src/truetype/ttinterp.c | 7 ++++--- src/truetype/ttinterp.h | 10 +++++++++- 3 files changed, 37 insertions(+), 10 deletions(-) (limited to 'src/truetype') diff --git a/src/truetype/ttgload.c b/src/truetype/ttgload.c index ad416f0c..2fc031bc 100644 --- a/src/truetype/ttgload.c +++ b/src/truetype/ttgload.c @@ -1141,7 +1141,8 @@ { FT_Stream stream = loader->stream; - FT_UShort n_ins; + FT_UShort n_ins, max_ins; + FT_ULong tmp; /* TT_Load_Composite_Glyph only gives us the offset of instructions */ @@ -1153,12 +1154,27 @@ FT_TRACE5(( " Instructions size = %d\n", n_ins )); /* check it */ - if ( n_ins > ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions ) + max_ins = ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions; + if ( n_ins > max_ins ) { - FT_TRACE0(( "TT_Process_Composite_Glyph: too many instructions (%d)\n", - n_ins )); + /* acroread ignores this field, so we only do a rough safety check */ + if ( (FT_Int)n_ins > loader->byte_len ) + { + FT_TRACE1(( "TT_Process_Composite_Glyph: " + "too many instructions (%d) for glyph with length (%d)\n", + n_ins, loader->byte_len )); + return TT_Err_Too_Many_Hints; + } - return TT_Err_Too_Many_Hints; + tmp = loader->exec->glyphSize; + error = Update_Max( loader->exec->memory, + &tmp, + sizeof ( FT_Byte ), + (void*)&loader->exec->glyphIns, + n_ins ); + loader->exec->glyphSize = (FT_UShort)tmp; + if ( error ) + return error; } else if ( n_ins == 0 ) return TT_Err_Ok; @@ -1516,6 +1532,7 @@ FT_UInt num_base_subgs = gloader->base.num_subglyphs; FT_Stream old_stream = loader->stream; + FT_Int old_byte_len = loader->byte_len; FT_GlyphLoader_Add( gloader ); @@ -1570,7 +1587,8 @@ num_base_points ); } - loader->stream = old_stream; + loader->stream = old_stream; + loader->byte_len = old_byte_len; /* process the glyph */ loader->ins_pos = ins_pos; diff --git a/src/truetype/ttinterp.c b/src/truetype/ttinterp.c index 13aa9a27..18ff7c62 100644 --- a/src/truetype/ttinterp.c +++ b/src/truetype/ttinterp.c @@ -4,8 +4,9 @@ /* */ /* TrueType bytecode interpreter (body). */ /* */ -/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by */ -/* David Turner, Robert Wilhelm, and Werner Lemberg. */ +/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, */ +/* 2010 */ +/* by 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 */ @@ -508,7 +509,7 @@ /* */ /* FreeType error code. 0 means success. */ /* */ - static FT_Error + FT_LOCAL_DEF( FT_Error ) Update_Max( FT_Memory memory, FT_ULong* size, FT_Long multiplier, diff --git a/src/truetype/ttinterp.h b/src/truetype/ttinterp.h index 07a8972c..732a1f29 100644 --- a/src/truetype/ttinterp.h +++ b/src/truetype/ttinterp.h @@ -4,7 +4,7 @@ /* */ /* TrueType bytecode interpreter (specification). */ /* */ -/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 by */ +/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2010 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ @@ -239,6 +239,14 @@ FT_BEGIN_HEADER FT_Int range ); + FT_LOCAL( FT_Error ) + Update_Max( FT_Memory memory, + FT_ULong* size, + FT_Long multiplier, + void* _pbuff, + FT_ULong new_max ); + + /*************************************************************************/ /* */ /* */ -- cgit v1.2.3