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[sfnt] Further generalize `sfnt_get_ps_name'; report invalid data. 

* src/sfnt/sfdriver.c (sfnt_ps_map): New array.
(sfnt_is_postscript): New function.
(char_type_func): New typedef.
(get_win_string, get_apple_string): Add argument to specify
character checking function.
Add argument whether argument checking failures should be reported.
Update callers.
(search_name_id): Fix return value.
This commit is contained in:
Werner Lemberg 2017-02-28 15:11:21 +01:00
parent b653a23079
commit b553fcb514
2 changed files with 117 additions and 22 deletions
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13
ChangeLog
View File

@ -1,3 +1,16 @@
2017-02-23 Werner Lemberg <wl@gnu.org>
[sfnt] Further generalize `sfnt_get_ps_name'; report invalid data.
* src/sfnt/sfdriver.c (sfnt_ps_map): New array.
(sfnt_is_postscript): New function.
(char_type_func): New typedef.
(get_win_string, get_apple_string): Add argument to specify
character checking function.
Add argument whether argument checking failures should be reported.
Update callers.
(search_name_id): Fix return value.
2017-02-23 Werner Lemberg <wl@gnu.org>
[sfnt] Split off another bit of `sfnt_get_ps_name'.

126
src/sfnt/sfdriver.c
View File

@ -220,6 +220,39 @@
*
*/
/* an array representing allowed ASCII characters in a PS string */
static const unsigned char sfnt_ps_map[16] =
{
/* 4 0 C 8 */
0x00, 0x00, /* 0x00: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 */
0x00, 0x00, /* 0x10: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 */
0xDE, 0x7C, /* 0x20: 1 1 0 1 1 1 1 0 0 1 1 1 1 1 0 0 */
0xFF, 0xAF, /* 0x30: 1 1 1 1 1 1 1 1 1 0 1 0 1 1 1 1 */
0xFF, 0xFF, /* 0x40: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 */
0xFF, 0xD7, /* 0x50: 1 1 1 1 1 1 1 1 1 1 0 1 0 1 1 1 */
0xFF, 0xFF, /* 0x60: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 */
0xFF, 0x57 /* 0x70: 1 1 1 1 1 1 1 1 0 1 0 1 0 1 1 1 */
};
static int
sfnt_is_postscript( int c )
{
unsigned int cc;
if ( c < 0 || c >= 0x80 )
return 0;
cc = (unsigned int)c;
return sfnt_ps_map[cc >> 3] & ( 1 << ( cc & 0x07 ) );
}
typedef int (*char_type_func)( int c );
/* handling of PID/EID 3/0 and 3/1 is the same */
#define IS_WIN( n ) ( (n)->platformID == 3 && \
( (n)->encodingID == 1 || (n)->encodingID == 0 ) && \
@ -230,9 +263,11 @@
(n)->languageID == 0 )
static const char*
get_win_string( FT_Memory memory,
FT_Stream stream,
TT_Name entry )
get_win_string( FT_Memory memory,
FT_Stream stream,
TT_Name entry,
char_type_func char_type,
FT_Bool report_invalid_characters )
{
FT_Error error = FT_Err_Ok;
@ -263,8 +298,22 @@
for ( len = entry->stringLength / 2; len > 0; len--, p += 2 )
{
if ( p[0] == 0 && p[1] >= 32 )
*r++ = p[1];
if ( p[0] == 0 )
{
if ( char_type( p[1] ) )
*r++ = p[1];
else
{
if ( report_invalid_characters )
{
FT_TRACE0(( "get_win_string:"
" Character `%c' (0x%X) invalid in PS name string\n",
p[1], p[1] ));
/* it's not the job of FreeType to correct PS names... */
*r++ = p[1];
}
}
}
}
*r = '\0';
@ -275,13 +324,18 @@
static const char*
get_apple_string( FT_Memory memory,
FT_Stream stream,
TT_Name entry )
get_apple_string( FT_Memory memory,
FT_Stream stream,
TT_Name entry,
char_type_func char_type,
FT_Bool report_invalid_characters )
{
FT_Error error = FT_Err_Ok;
const char* result;
FT_String* r;
FT_Char* p;
FT_UInt len;
FT_UNUSED( error );
@ -289,8 +343,8 @@
if ( FT_ALLOC( result, entry->stringLength + 1 ) )
return NULL;
if ( FT_STREAM_SEEK( entry->stringOffset ) ||
FT_STREAM_READ( result, entry->stringLength ) )
if ( FT_STREAM_SEEK( entry->stringOffset ) ||
FT_FRAME_ENTER( entry->stringLength ) )
{
FT_FREE( result );
entry->stringOffset = 0;
@ -300,7 +354,28 @@
return NULL;
}
((char*)result)[entry->stringLength] = '\0';
r = (FT_String*)result;
p = (FT_Char*)stream->cursor;
for ( len = entry->stringLength; len > 0; len--, p++ )
{
if ( char_type( *p ) )
*r++ = *p;
else
{
if ( report_invalid_characters )
{
FT_TRACE0(( "get_apple_string:"
" Character `%c' (0x%X) invalid in PS name string\n",
*p, *p ));
/* it's not the job of FreeType to correct PS names... */
*r++ = *p;
}
}
}
*r = '\0';
FT_FRAME_EXIT();
return result;
}
@ -333,14 +408,14 @@
}
}
return *win || *apple;
return ( *win >= 0 ) || ( *apple >= 0 );
}
static const char*
sfnt_get_ps_name( TT_Face face )
{
FT_Int found_win, found_apple;
FT_Int found, win, apple;
const char* result = NULL;
@ -349,17 +424,24 @@
/* scan the name table to see whether we have a Postscript name here, */
/* either in Macintosh or Windows platform encodings */
search_name_id( face, 6, &found_win, &found_apple );
found = search_name_id( face, 6, &win, &apple );
/* prefer Windows entries over Apple */
if ( found_win != -1 )
result = get_win_string( face->root.memory,
face->name_table.stream,
face->name_table.names + found_win );
else if ( found_apple != -1 )
result = get_apple_string( face->root.memory,
if ( found )
{
/* prefer Windows entries over Apple */
if ( win != -1 )
result = get_win_string( face->root.memory,
face->name_table.stream,
face->name_table.names + found_apple );
face->name_table.names + win,
sfnt_is_postscript,
1 );
else
result = get_apple_string( face->root.memory,
face->name_table.stream,
face->name_table.names + apple,
sfnt_is_postscript,
1 );
}
face->postscript_name = result;