4 files changed, 19 insertions, 1 deletions

diff --git a/ext/mbstring/libmbfl/mbfl/mbfilter.c b/ext/mbstring/libmbfl/mbfl/mbfilter.c
index ec3409d8ea..9f16331874 100644
--- a/ext/mbstring/libmbfl/mbfl/mbfilter.c
+++ b/ext/mbstring/libmbfl/mbfl/mbfilter.c
@@ -331,6 +331,20 @@ mbfl_buffer_converter_feed_result(mbfl_buffer_converter *convd, mbfl_string *str
 	return mbfl_memory_device_result(&convd->device, result);
 }
 
+int mbfl_buffer_illegalchars(mbfl_buffer_converter *convd)
+{
+	int num_illegalchars = 0;
+
+	if (convd->filter1 != NULL) {
+		num_illegalchars += convd->filter1->num_illegalchar;
+	}
+
+	if (convd->filter2 != NULL) {
+		num_illegalchars += convd->filter2->num_illegalchar;
+	}
+
+	return (num_illegalchars);
+}
 
 /*
  * encoding detector
diff --git a/ext/mbstring/libmbfl/mbfl/mbfilter.h b/ext/mbstring/libmbfl/mbfl/mbfilter.h
index 702079ac45..f958e936ab 100644
--- a/ext/mbstring/libmbfl/mbfl/mbfilter.h
+++ b/ext/mbstring/libmbfl/mbfl/mbfilter.h
@@ -129,6 +129,7 @@ MBFLAPI extern int mbfl_buffer_converter_flush(mbfl_buffer_converter *convd);
 MBFLAPI extern mbfl_string * mbfl_buffer_converter_getbuffer(mbfl_buffer_converter *convd, mbfl_string *result);
 MBFLAPI extern mbfl_string * mbfl_buffer_converter_result(mbfl_buffer_converter *convd, mbfl_string *result);
 MBFLAPI extern mbfl_string * mbfl_buffer_converter_feed_result(mbfl_buffer_converter *convd, mbfl_string *string, mbfl_string *result);
+MBFLAPI extern int mbfl_buffer_illegalchars(mbfl_buffer_converter *convd);
 
 /*
  * encoding detector
diff --git a/ext/mbstring/libmbfl/mbfl/mbfl_convert.c b/ext/mbstring/libmbfl/mbfl/mbfl_convert.c
index 981bba6af9..78a995cd25 100644
--- a/ext/mbstring/libmbfl/mbfl/mbfl_convert.c
+++ b/ext/mbstring/libmbfl/mbfl/mbfl_convert.c
@@ -250,6 +250,7 @@ mbfl_convert_filter_new(
 	filter->data = data;
 	filter->illegal_mode = MBFL_OUTPUTFILTER_ILLEGAL_MODE_CHAR;
 	filter->illegal_substchar = 0x3f;		/* '?' */
+	filter->num_illegalchar = 0;
 
 	/* setup the function table */
 	mbfl_convert_filter_reset_vtbl(filter);
@@ -317,6 +318,7 @@ mbfl_convert_filter_copy(
 	dist->to = src->to;
 	dist->illegal_mode = src->illegal_mode;
 	dist->illegal_substchar = src->illegal_substchar;
+	dist->num_illegalchar = src->num_illegalchar;
 }
 
 int mbfl_convert_filter_devcat(mbfl_convert_filter *filter, mbfl_memory_device *src) 
@@ -432,7 +434,7 @@ mbfl_filt_conv_illegal_output(int c, mbfl_convert_filter *filter)
 		break;
 	}
 	filter->illegal_mode = mode_backup;
-
+	filter->num_illegalchar++;
 	return ret;
 }
 
diff --git a/ext/mbstring/libmbfl/mbfl/mbfl_convert.h b/ext/mbstring/libmbfl/mbfl/mbfl_convert.h
index afec8f0627..bf8b3bd630 100644
--- a/ext/mbstring/libmbfl/mbfl/mbfl_convert.h
+++ b/ext/mbstring/libmbfl/mbfl/mbfl_convert.h
@@ -51,6 +51,7 @@ struct _mbfl_convert_filter {
 	const mbfl_encoding *to;
 	int illegal_mode;
 	int illegal_substchar;
+	int num_illegalchar;
 	void *opaque;
 };