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[bdf, cid, pfr, winfonts] Improve rejection of other font formats. 

This is mainly for better diagnostics of malformed fonts.

* src/bdf/bdflib.c (_bfd_readstream): Stop font format testing if the first
input line is too long or doesn't end with `\r` or `\n`.

* src/cid/cidparse.c (cid_parser_new): Don't handle too short input as an
error but as an unknown format.

* src/pfr/pfrobjs.c (pfr_face_init): Ditto.

* src/winfonts/winfnt.c (fnt_font_load, fnt_face_get_dll_font): Ditto.
This commit is contained in:
Werner Lemberg 2021-10-19 22:59:46 +02:00
parent 38b349c41b
commit 8ef8072ba1
4 changed files with 31 additions and 5 deletions
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15
src/bdf/bdflib.c
View File

@ -581,8 +581,14 @@
/* or even resizing it */ /* or even resizing it */
if ( end >= avail ) if ( end >= avail )
{ {
if ( bytes == 0 ) /* last line in file doesn't end in \r or \n */ if ( bytes == 0 )
break; /* ignore it then exit */ {
/* last line in file doesn't end in \r or \n; */
/* ignore it then exit */
if ( lineno == 1 )
error = FT_THROW( Missing_Startfont_Field );
break;
}
if ( start == 0 ) if ( start == 0 )
{ {
@ -592,9 +598,14 @@
if ( buf_size >= 65536UL ) /* limit ourselves to 64KByte */ if ( buf_size >= 65536UL ) /* limit ourselves to 64KByte */
{
if ( lineno == 1 )
error = FT_THROW( Missing_Startfont_Field );
else
{ {
FT_ERROR(( "_bdf_readstream: " ERRMSG6, lineno )); FT_ERROR(( "_bdf_readstream: " ERRMSG6, lineno ));
error = FT_THROW( Invalid_Argument ); error = FT_THROW( Invalid_Argument );
}
goto Exit; goto Exit;
} }

4
src/cid/cidparse.c
View File

@ -73,7 +73,11 @@
/* first of all, check the font format in the header */ /* first of all, check the font format in the header */
if ( FT_FRAME_ENTER( 31 ) ) if ( FT_FRAME_ENTER( 31 ) )
{
FT_TRACE2(( " not a CID-keyed font\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit; goto Exit;
}
if ( ft_strncmp( (char *)stream->cursor, if ( ft_strncmp( (char *)stream->cursor,
"%!PS-Adobe-3.0 Resource-CIDFont", 31 ) ) "%!PS-Adobe-3.0 Resource-CIDFont", 31 ) )

4
src/pfr/pfrobjs.c
View File

@ -83,7 +83,11 @@
/* load the header and check it */ /* load the header and check it */
error = pfr_header_load( &face->header, stream ); error = pfr_header_load( &face->header, stream );
if ( error ) if ( error )
{
FT_TRACE2(( " not a PFR font\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit; goto Exit;
}
if ( !pfr_header_check( &face->header ) ) if ( !pfr_header_check( &face->header ) )
{ {

7
src/winfonts/winfnt.c
View File

@ -217,7 +217,11 @@
/* first of all, read the FNT header */ /* first of all, read the FNT header */
if ( FT_STREAM_SEEK( font->offset ) || if ( FT_STREAM_SEEK( font->offset ) ||
FT_STREAM_READ_FIELDS( winfnt_header_fields, header ) ) FT_STREAM_READ_FIELDS( winfnt_header_fields, header ) )
{
FT_TRACE2(( " not a Windows FNT file\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit; goto Exit;
}
/* check header */ /* check header */
if ( header->version != 0x200 && if ( header->version != 0x200 &&
@ -284,7 +288,10 @@
/* does it begin with an MZ header? */ /* does it begin with an MZ header? */
if ( FT_STREAM_SEEK( 0 ) || if ( FT_STREAM_SEEK( 0 ) ||
FT_STREAM_READ_FIELDS( winmz_header_fields, &mz_header ) ) FT_STREAM_READ_FIELDS( winmz_header_fields, &mz_header ) )
{
error = FT_ERR( Unknown_File_Format );
goto Exit; goto Exit;
}
error = FT_ERR( Unknown_File_Format ); error = FT_ERR( Unknown_File_Format );
if ( mz_header.magic == WINFNT_MZ_MAGIC ) if ( mz_header.magic == WINFNT_MZ_MAGIC )