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* include/freetype/internal/tttypes.h, src/sfnt/ttload.c, 

src/sfnt/sfobjs.c, src/sfnt/sfdriver.c, src/base/ftnames.c:
        fixing the SFNT name table loader to support various buggy fonts.
        it now ignores empty name entries, entries with invalid pointer
        offsets and certain fonts containing tables with broken "storageOffset"
        fields.

        name strings are now loaded on demand, which reduces the memory
        requirements for a given FT_Face tremendously (for example, the
        name table of Arial.ttf is about 10Kb and contains 70 names !!)

        finally, this is a _quick_ fix. The whole name table loader and
        interface will be rewritten in a much more cleanly way shortly,
        once CSEH have been introduced in the sources.
This commit is contained in:
David Turner 2002-05-27 23:52:01 +00:00
parent 76a047f544
commit c9d2024e0e
6 changed files with 177 additions and 127 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
ChangeLog
View File

@ -1,3 +1,20 @@
2002-05-28 David Turner <david@freetype.org>
* include/freetype/internal/tttypes.h, src/sfnt/ttload.c,
src/sfnt/sfobjs.c, src/sfnt/sfdriver.c, src/base/ftnames.c:
fixing the SFNT name table loader to support various buggy fonts.
it now ignores empty name entries, entries with invalid pointer
offsets and certain fonts containing tables with broken "storageOffset"
fields.
name strings are now loaded on demand, which reduces the memory
requirements for a given FT_Face tremendously (for example, the
name table of Arial.ttf is about 10Kb and contains 70 names !!)
finally, this is a _quick_ fix. The whole name table loader and
interface will be rewritten in a much more cleanly way shortly,
once CSEH have been introduced in the sources.
2002-05-24 Tim Mooney <enchanter@users.sourceforge.net>
* builds/unix/ft-munmap.m4: New file, extracted FT_MUNMAP_DECL and

14
include/freetype/internal/tttypes.h
View File

@ -289,7 +289,7 @@ FT_BEGIN_HEADER
FT_UShort languageID;
FT_UShort nameID;
FT_UShort stringLength;
FT_UShort stringOffset;
FT_ULong stringOffset;
/* this last field is not defined in the spec */
/* but used by the FreeType engine */
@ -317,15 +317,15 @@ FT_BEGIN_HEADER
/* */
/* names :: An array of name records. */
/* */
/* storage :: The names storage area. */
/* stream :: the file's input stream. */
/* */
typedef struct TT_NameTableRec_
{
FT_UShort format;
FT_UShort numNameRecords;
FT_UShort storageOffset;
FT_UInt numNameRecords;
FT_UInt storageOffset;
TT_NameEntryRec* names;
FT_Byte* storage;
FT_Stream stream;
} TT_NameTableRec, *TT_NameTable;
@ -1076,7 +1076,7 @@ FT_BEGIN_HEADER
TT_CharMap_Func get_index;
TT_CharNext_Func get_next_char;
} TT_CMapTableRec;
@ -1664,7 +1664,7 @@ FT_BEGIN_HEADER
/* for possible extensibility in other formats */
void* other;
} TT_LoaderRec;

29
src/base/ftnames.c
View File

@ -53,15 +53,30 @@
if ( idx < (FT_UInt)ttface->num_names )
{
TT_NameEntryRec* name = ttface->name_table.names + idx;
TT_NameEntryRec* entry = ttface->name_table.names + idx;
aname->platform_id = name->platformID;
aname->encoding_id = name->encodingID;
aname->language_id = name->languageID;
aname->name_id = name->nameID;
aname->string = (FT_Byte*)name->string;
aname->string_len = name->stringLength;
/* load name on demand */
if ( entry->stringLength > 0 && entry->string == NULL )
{
FT_Memory memory = face->memory;
if ( FT_NEW_ARRAY ( entry->string, entry->stringLength ) ||
FT_STREAM_SEEK ( entry->stringOffset ) ||
FT_STREAM_READ_AT( entry->string, entry->stringLength ) )
{
FT_FREE( entry->string );
entry->stringLength = 0;
}
}
aname->platform_id = entry->platformID;
aname->encoding_id = entry->encodingID;
aname->language_id = entry->languageID;
aname->name_id = entry->nameID;
aname->string = (FT_Byte*)entry->string;
aname->string_len = entry->stringLength;
error = FT_Err_Ok;
}

43
src/sfnt/sfdriver.c
View File

@ -124,39 +124,52 @@
/* either in Macintosh or Windows platform encodings */
found_win = -1;
found_apple = -1;
for ( n = 0; n < face->num_names; n++ )
{
TT_NameEntryRec* name = face->name_table.names + n;
if ( name->nameID == 6 && name->string != NULL )
if ( name->nameID == 6 && name->stringLength > 0 )
{
if ( name->platformID == 3 &&
name->encodingID == 1 &&
name->languageID == 0x409 )
found_win = n;
if ( name->platformID == 1 &&
name->encodingID == 0 &&
name->languageID == 0 )
found_apple = n;
}
}
if ( found_win != -1 )
{
FT_Memory memory = face->root.memory;
TT_NameEntryRec* name = face->name_table.names + found_win;
FT_UInt len = name->stringLength / 2;
FT_Error error;
if ( !FT_ALLOC( result, len + 1 ) )
if ( !FT_ALLOC( result, name->stringLength+1 ) )
{
FT_Stream stream = face->name_table.stream;
FT_String* r = (FT_String*)result;
FT_Byte* p = (FT_Byte*)name->string;
if ( FT_STREAM_SEEK( name->stringOffset ) ||
FT_FRAME_ENTER( name->stringLength ) )
{
FT_FREE( result );
name->stringLength = 0;
name->stringOffset = 0;
FT_FREE( name->string );
goto Exit;
}
p = (FT_Byte*) stream->cursor;
for ( ; len > 0; len--, p += 2 )
{
@ -164,6 +177,8 @@
*r++ = p[1];
}
*r = '\0';
FT_FRAME_EXIT();
}
goto Exit;
}
@ -178,10 +193,20 @@
if ( !FT_ALLOC( result, len + 1 ) )
{
FT_MEM_COPY( (char*)result, name->string, len );
FT_Stream stream = face->name_table.stream;
if ( FT_STREAM_SEEK( name->stringOffset ) ||
FT_STREAM_READ( result, len ) )
{
name->stringOffset = 0;
name->stringLength = 0;
FT_FREE( name->string );
FT_FREE( result );
goto Exit;
}
((char*)result)[len] = '\0';
}
goto Exit;
}
Exit:

42
src/sfnt/sfobjs.c
View File

@ -129,6 +129,9 @@
}
typedef FT_String* (*TT_NameEntry_ConvertFunc)( TT_NameEntry entry,
FT_Memory memory );
/*************************************************************************/
/* */
/* <Function> */
@ -157,6 +160,7 @@
FT_Int found_win = -1;
FT_Int found_unicode = -1;
TT_NameEntry_ConvertFunc convert;
rec = face->name_table.names;
for ( n = 0; n < face->num_names; n++, rec++ )
@ -170,7 +174,7 @@
/* thing and goes to suggest that all Unicode `name' table entries */
/* should be coded in UTF-16 (in big-endian format I suppose). */
/* */
if ( rec->nameID == nameid && rec->string )
if ( rec->nameID == nameid && rec->stringLength > 0 )
{
switch ( rec->platformID )
{
@ -218,6 +222,7 @@
/* some fonts contain invalid Unicode or Macintosh formatted entries; */
/* we will thus favor names encoded in Windows formats if available */
/* */
convert = NULL;
if ( found_win >= 0 )
{
rec = face->name_table.names + found_win;
@ -225,11 +230,11 @@
{
case TT_MS_ID_UNICODE_CS:
case TT_MS_ID_SYMBOL_CS:
result = tt_name_entry_ascii_from_utf16( rec, memory );
convert = tt_name_entry_ascii_from_utf16;
break;
case TT_MS_ID_UCS_4:
result = tt_name_entry_ascii_from_ucs4( rec, memory );
convert = tt_name_entry_ascii_from_ucs4;
break;
default:
@ -238,15 +243,38 @@
}
else if ( found_apple >= 0 )
{
rec = face->name_table.names + found_apple;
result = tt_name_entry_ascii_from_other( rec, memory );
rec = face->name_table.names + found_apple;
convert = tt_name_entry_ascii_from_other;
}
else if ( found_unicode >= 0 )
{
rec = face->name_table.names + found_unicode;
result = tt_name_entry_ascii_from_utf16( rec, memory );
rec = face->name_table.names + found_unicode;
convert = tt_name_entry_ascii_from_utf16;
}
if ( rec && convert )
{
if ( rec->string == NULL )
{
FT_Error error;
FT_Stream stream = face->name_table.stream;
if ( FT_NEW_ARRAY ( rec->string, rec->stringLength ) ||
FT_STREAM_SEEK( rec->stringOffset ) ||
FT_STREAM_READ( rec->string, rec->stringLength ) )
{
FT_FREE( rec->string );
rec->stringLength = 0;
result = NULL;
goto Exit;
}
}
result = convert( rec, memory );
}
Exit:
return result;
}

159
src/sfnt/ttload.c
View File

@ -934,14 +934,12 @@
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_ULong table_pos, table_len;
FT_ULong storageOffset, storageSize;
FT_Byte* storage;
FT_ULong storage_start, storage_limit;
FT_UInt count;
TT_NameTable table;
TT_NameTable names;
const FT_Frame_Field name_table_fields[] =
static const FT_Frame_Field name_table_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_NameTableRec
@ -953,7 +951,7 @@
FT_FRAME_END
};
const FT_Frame_Field name_record_fields[] =
static const FT_Frame_Field name_record_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_NameEntryRec
@ -969,6 +967,9 @@
};
table = &face->name_table;
table->stream = stream;
FT_TRACE2(( "Names " ));
error = face->goto_table( face, TTAG_name, stream, &table_len );
@ -982,115 +983,74 @@
table_pos = FT_STREAM_POS();
names = &face->name_table;
if ( FT_STREAM_READ_FIELDS( name_table_fields, names ) )
if ( FT_STREAM_READ_FIELDS( name_table_fields, table ) )
goto Exit;
/* check the 'storageOffset' field */
storageOffset = names->storageOffset;
/* some popular asian fonts have an invalid 'storageOffset' value */
/* (it should be at least "6 + 12*num_names"). However, the string */
/* offsets, computed as "storageOffset + entry->stringOffset" are */
/* valid pointers within the name table... */
/* */
/* we thus can't check "storageOffset" right now */
/* */
/* Some broken Asian fonts have a storage offset whose value is */
/* 12 * numNameRecords. We deal with them here. */
if ( storageOffset == (FT_ULong)(12 * names->numNameRecords) )
storageOffset += 6;
if ( storageOffset < (FT_ULong)( 6 + 12 * names->numNameRecords ) ||
table_len <= storageOffset )
storage_start = table_pos + 6 + 12*table->numNameRecords;
storage_limit = table_pos + table_len;
if ( storage_start > storage_limit )
{
FT_ERROR(( "TT_Load_Names: invalid `name' table\n" ));
error = SFNT_Err_Name_Table_Missing;
goto Exit;
}
storageSize = (FT_ULong)(table_len - storageOffset);
/* Allocate the array of name records. */
if ( FT_ALLOC( names->names,
names->numNameRecords * sizeof ( TT_NameEntryRec ) +
storageSize ) ||
FT_FRAME_ENTER( names->numNameRecords * 12L ) )
goto Exit;
count = table->numNameRecords;
table->numNameRecords = 0;
storage = (FT_Byte*)( names->names + names->numNameRecords );
if ( FT_NEW_ARRAY( table->names, count ) ||
FT_FRAME_ENTER( count * 12 ) )
goto Exit;
/* Load the name records and determine how much storage is needed */
/* to hold the strings themselves. */
{
TT_NameEntryRec* cur = names->names;
TT_NameEntryRec* limit = cur + names->numNameRecords;
TT_NameEntryRec* entry = table->names;
for ( ; cur < limit; cur ++ )
for ( ; count > 0; count-- )
{
if ( FT_STREAM_READ_FIELDS( name_record_fields, cur ) )
break;
if ( FT_STREAM_READ_FIELDS( name_record_fields, entry ) )
continue;
/* invalid name entries will have "cur->string" set to NULL! */
if ( (FT_ULong)( cur->stringOffset + cur->stringLength ) < storageSize )
cur->string = storage + cur->stringOffset;
else
/* check that the name is not empty */
if ( entry->stringLength == 0 )
continue;
/* check that the name string is within the table */
entry->stringOffset += table_pos + table->storageOffset;
if ( entry->stringOffset < storage_start ||
entry->stringOffset + entry->stringLength > storage_limit )
{
/* that's an invalid entry */
cur->stringOffset = 0;
cur->string = NULL;
/* invalid entry - ignore it */
entry->stringOffset = 0;
entry->stringLength = 0;
continue;
}
entry++;
}
table->numNameRecords = entry - table->names;
}
FT_FRAME_EXIT();
if ( error )
goto Exit;
storageOffset -= 6 + 12 * names->numNameRecords;
if ( FT_STREAM_SKIP( storageOffset ) ||
FT_STREAM_READ( storage, storageSize ) )
goto Exit;
#ifdef FT_DEBUG_LEVEL_TRACE
/* print Name Record Table in case of debugging */
{
TT_NameEntryRec* cur = names->names;
TT_NameEntryRec* limit = cur + names->numNameRecords;
for ( ; cur < limit; cur++ )
{
FT_UInt j;
FT_TRACE3(( "(%2d %2d %4x %2d) ",
cur->platformID,
cur->encodingID,
cur->languageID,
cur->nameID ));
/* I know that M$ encoded strings are Unicode, */
/* but this works reasonable well for debugging purposes. */
if ( cur->string )
for ( j = 0; j < (FT_UInt)cur->stringLength; j++ )
{
FT_Byte c = *(FT_Byte*)( cur->string + j );
if ( c >= 32 && c < 128 )
FT_TRACE3(( "%c", c ));
}
else
FT_TRACE3(( "Invalid entry!\n" ));
FT_TRACE3(( "\n" ));
}
}
#endif /* FT_DEBUG_LEVEL_TRACE */
FT_TRACE2(( "loaded\n" ));
/* everything went well, update face->num_names */
face->num_names = names->numNameRecords;
face->num_names = table->numNameRecords;
Exit:
return error;
@ -1112,18 +1072,23 @@
TT_Free_Names( TT_Face face )
{
FT_Memory memory = face->root.driver->root.memory;
TT_NameTable names = &face->name_table;
TT_NameTable table = &face->name_table;
TT_NameEntry entry = table->names;
FT_UInt count = table->numNameRecords;
for ( ; count > 0; count--, entry++ )
{
FT_FREE( entry->string );
entry->stringLength = 0;
}
/* free strings table */
FT_FREE( names->names );
FT_FREE( table->names );
/* free strings storage */
FT_FREE( names->storage );
names->numNameRecords = 0;
names->format = 0;
names->storageOffset = 0;
table->numNameRecords = 0;
table->format = 0;
table->storageOffset = 0;
}
@ -1161,7 +1126,7 @@
error = SFNT_Err_CMap_Table_Missing;
goto Exit;
}
if ( !FT_FRAME_EXTRACT( face->cmap_size, face->cmap_table ) )
FT_TRACE2(( "`cmap' table loaded\n" ));
else
@ -1169,13 +1134,13 @@
FT_ERROR(( "`cmap' table is too short!\n" ));
face->cmap_size = 0;
}
Exit:
return error;
}
#else /* !FT_CONFIG_OPTION_USE_CMAPS */
FT_LOCAL_DEF( FT_Error )
TT_Load_CMap( TT_Face face,
FT_Stream stream )