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[raccess] Grouping resource access rules based on Darwin VFS. 

MacOS X/Darwin kernel supports a few tricky methods to access
a resource fork via ANSI C or POSIX interface.  Current resource
fork accessor tries all possible methods to support all kernels.
But if a method could open a resource fork but no font is found,
there is no need to try other methods older than tested method.
To determine whether the rule index is for Darwin VFS, a local
function ftrfork.c::raccess_rule_by_darwin_vfs() is introduced.
To use this function in ftobjs.c etc but it should be inlined,
it is exposed by ftbase.h.

* src/base/ftrfork.c (FT_RFork_Rule): New enum type to identify
the rules to access the resource fork.
(raccess_guess_rec): New structure to bind the rule function and
rule enum type.
(FT_Raccess_Guess): The list of the rule functions is replaced by
(raccess_guess_table): This.  This is exposed to be used by other
intra module functions.
(raccess_rule_by_darwin_vfs): A function to return a boolean
if the rule specified by the rule index is based on Darwin VFS.
This commit is contained in:
suzuki toshiya 2010-10-13 17:05:42 +09:00
parent 4b71871418
commit c081a4a932
3 changed files with 100 additions and 15 deletions
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24
ChangeLog
View File

@ -1,3 +1,27 @@
2010-10-13 suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
[raccess] Grouping resource access rules based on Darwin VFS.
MacOS X/Darwin kernel supports a few tricky methods to access
a resource fork via ANSI C or POSIX interface. Current resource
fork accessor tries all possible methods to support all kernels.
But if a method could open a resource fork but no font is found,
there is no need to try other methods older than tested method.
To determine whether the rule index is for Darwin VFS, a local
function ftrfork.c::raccess_rule_by_darwin_vfs() is introduced.
To use this function in ftobjs.c etc but it should be inlined,
it is exposed by ftbase.h.
* src/base/ftrfork.c (FT_RFork_Rule): New enum type to identify
the rules to access the resource fork.
(raccess_guess_rec): New structure to bind the rule function and
rule enum type.
(FT_Raccess_Guess): The list of the rule functions is replaced by
(raccess_guess_table): This. This is exposed to be used by other
intra module functions.
(raccess_rule_by_darwin_vfs): A function to return a boolean
if the rule specified by the rule index is based on Darwin VFS.
2010-10-13 suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
Prevent to open a FT_Stream for zero-sized file on non-Unix.

11
src/base/ftbase.h
View File

@ -49,6 +49,17 @@ FT_BEGIN_HEADER
FT_Face *aface );
#ifdef FT_CONFIG_OPTION_GUESSING_EMBEDDED_RFORK
/* Mac OS X/Darwin kernel often changes recommended method to access */
/* the resource fork and older methods makes the kernel issue the */
/* warning of deprecated method. To calm it down, the methods based */
/* on Darwin VFS should be grouped and skip the rest methods after */
/* the case the resource is opened but found to lack a font in it. */
FT_LOCAL( FT_Bool )
raccess_rule_by_darwin_vfs( FT_UInt rule_index );
#endif /* FT_CONFIG_OPTION_GUESSING_EMBEDDED_RFORK */
FT_END_HEADER
#endif /* __FTBASE_H__ */

80
src/base/ftrfork.c
View File

@ -349,6 +349,42 @@
const char *insertion );
typedef enum FT_RFork_Rule_ {
FT_RFork_Rule_invalid = -2,
FT_RFork_Rule_uknown, /* -1 */
FT_RFork_Rule_apple_double,
FT_RFork_Rule_apple_single,
FT_RFork_Rule_darwin_ufs_export,
FT_RFork_Rule_darwin_newvfs,
FT_RFork_Rule_darwin_hfsplus,
FT_RFork_Rule_vfat,
FT_RFork_Rule_linux_cap,
FT_RFork_Rule_linux_double,
FT_RFork_Rule_linux_netatalk
} FT_RFork_Rule;
/* For fast translation between rule index and rule type,
* the macros FT_RFORK_xxx should be kept consistent with
* the raccess_guess_funcs table
*/
typedef struct raccess_guess_rec_ {
raccess_guess_func func;
FT_RFork_Rule type;
} raccess_guess_rec;
static raccess_guess_rec raccess_guess_table[FT_RACCESS_N_RULES] =
{
{ raccess_guess_apple_double, FT_RFork_Rule_apple_double, },
{ raccess_guess_apple_single, FT_RFork_Rule_apple_single, },
{ raccess_guess_darwin_ufs_export, FT_RFork_Rule_darwin_ufs_export, },
{ raccess_guess_darwin_newvfs, FT_RFork_Rule_darwin_newvfs, },
{ raccess_guess_darwin_hfsplus, FT_RFork_Rule_darwin_hfsplus, },
{ raccess_guess_vfat, FT_RFork_Rule_vfat, },
{ raccess_guess_linux_cap, FT_RFork_Rule_linux_cap, },
{ raccess_guess_linux_double, FT_RFork_Rule_linux_double, },
{ raccess_guess_linux_netatalk, FT_RFork_Rule_linux_netatalk, },
};
FT_BASE_DEF( void )
FT_Raccess_Guess( FT_Library library,
FT_Stream stream,
@ -360,19 +396,6 @@
FT_Long i;
raccess_guess_func funcs[FT_RACCESS_N_RULES] =
{
raccess_guess_apple_double,
raccess_guess_apple_single,
raccess_guess_darwin_ufs_export,
raccess_guess_darwin_newvfs,
raccess_guess_darwin_hfsplus,
raccess_guess_vfat,
raccess_guess_linux_cap,
raccess_guess_linux_double,
raccess_guess_linux_netatalk,
};
for ( i = 0; i < FT_RACCESS_N_RULES; i++ )
{
new_names[i] = NULL;
@ -384,14 +407,41 @@
if ( errors[i] )
continue ;
errors[i] = (funcs[i])( library, stream, base_name,
&(new_names[i]), &(offsets[i]) );
errors[i] = (raccess_guess_table[i].func)( library,
stream, base_name,
&(new_names[i]),
&(offsets[i]) );
}
return;
}
static FT_RFork_Rule
raccess_get_rule_type_from_rule_index( FT_UInt rule_index )
{
if ( rule_index >= FT_RACCESS_N_RULES )
return FT_RFork_Rule_invalid;
return raccess_guess_table[rule_index].type;
}
FT_LOCAL_DEF( FT_Bool )
raccess_rule_by_darwin_vfs( FT_UInt rule_index )
{
switch( raccess_get_rule_type_from_rule_index( rule_index ) )
{
case FT_RFork_Rule_darwin_newvfs:
case FT_RFork_Rule_darwin_hfsplus:
return TRUE;
default:
return FALSE;
}
}
static FT_Error
raccess_guess_apple_double( FT_Library library,
FT_Stream stream,