Add mbstring identify filter for '7bit' encoding

Author: alexdowad

ext/mbstring/libmbfl/filters/mbfilter_7bit.c

@@ -31,6 +31,8 @@
 #include "mbfilter.h"
 #include "mbfilter_7bit.h"
 
+static int mbfl_filt_ident_7bit(int c, mbfl_identify_filter *filter);
+
 const mbfl_encoding mbfl_encoding_7bit = {
 	mbfl_no_encoding_7bit,
 	"7bit",
@@ -42,6 +44,12 @@ const mbfl_encoding mbfl_encoding_7bit = {
 	NULL
 };
 
+const struct mbfl_identify_vtbl vtbl_identify_7bit = {
+	mbfl_no_encoding_7bit,
+	mbfl_filt_ident_common_ctor,
+	mbfl_filt_ident_7bit
+};
+
 const struct mbfl_convert_vtbl vtbl_8bit_7bit = {
 	mbfl_no_encoding_8bit,
 	mbfl_no_encoding_7bit,
@@ -78,3 +86,11 @@ int mbfl_filt_conv_any_7bit(int c, mbfl_convert_filter *filter)
 	}
 	return c;
 }
+
+static int mbfl_filt_ident_7bit(int c, mbfl_identify_filter *filter)
+{
+	if (c >= 0x80) {
+		filter->flag = 1;
+	}
+	return c;
+}

ext/mbstring/libmbfl/filters/mbfilter_7bit.h

@@ -34,6 +34,7 @@
 #include "mbfilter.h"
 
 extern const mbfl_encoding mbfl_encoding_7bit;
+extern const struct mbfl_identify_vtbl vtbl_identify_7bit;
 extern const struct mbfl_convert_vtbl vtbl_8bit_7bit;
 extern const struct mbfl_convert_vtbl vtbl_7bit_8bit;
 

ext/mbstring/libmbfl/mbfl/mbfl_ident.c

@@ -159,6 +159,7 @@ static const struct mbfl_identify_vtbl *mbfl_identify_filter_list[] = {
 	&vtbl_identify_cp50221,
 	&vtbl_identify_cp50222,
 	&vtbl_identify_gb18030,
+	&vtbl_identify_7bit,
 	&vtbl_identify_false,
 	NULL
 };