diff --git a/core/include/blue/core/stream.h b/core/include/blue/core/stream.h
index 634f13d..a77f80b 100644
--- a/core/include/blue/core/stream.h
+++ b/core/include/blue/core/stream.h
@@ -42,8 +42,8 @@ B_TYPE_CLASS_DECLARATION_BEGIN(b_stream)
 	b_status (*s_seek)(b_stream *, long long, b_stream_seek_origin);
 	b_status (*s_tell)(const b_stream *, size_t *);
 	b_status (*s_getc)(b_stream *, b_wchar *);
-	b_status (*s_read)(b_stream *, unsigned char *, size_t, size_t *);
-	b_status (*s_write)(b_stream *, const unsigned char *, size_t, size_t *);
+	b_status (*s_read)(b_stream *, void *, size_t, size_t *);
+	b_status (*s_write)(b_stream *, const void *, size_t, size_t *);
 	b_status (*s_reserve)(b_stream *, size_t);
 B_TYPE_CLASS_DECLARATION_END(b_stream)
 
diff --git a/core/stream.c b/core/stream.c
index 44d77d0..6cb99fd 100644
--- a/core/stream.c
+++ b/core/stream.c
@@ -70,37 +70,13 @@ static b_stream *stdio[] = {
 	[IDX_STDIN] = NULL,
 	[IDX_STDOUT] = NULL,
 	[IDX_STDERR] = NULL,
-#if 0
-	[IDX_STDIN] = {
-		.s_mode = B_STREAM_READ,
-		.s_read = stdio_read,
-		.s_seek = stdio_seek,
-		.s_tell = stdio_tell,
-		.s_ptr0 = NULL, /* set to stdin (stdio.h) at runtime */
-	},
-	[IDX_STDOUT] = {
-		.s_mode = B_STREAM_WRITE,
-		.s_write = stdio_write,
-		.s_seek = stdio_seek,
-		.s_tell = stdio_tell,
-		.s_ptr0 = NULL, /* set to stdout (stdio.h) at runtime */
-	},
-	[IDX_STDERR] = {
-		.s_mode = B_STREAM_WRITE,
-		.s_write = stdio_write,
-		.s_seek = stdio_seek,
-		.s_tell = stdio_tell,
-		.s_ptr0 = NULL, /* set to stderr (stdio.h) at runtime */
-	},
-#endif
 };
 
 /*** PRIVATE FUNCTIONS ********************************************************/
 
 b_type b_stdio_stream_get_type(void);
-static enum b_status stdio_read(b_stream *, unsigned char *, size_t, size_t *);
-static enum b_status stdio_write(
-	b_stream *, const unsigned char *, size_t, size_t *);
+static enum b_status stdio_read(b_stream *, void *, size_t, size_t *);
+static enum b_status stdio_write(b_stream *, const void *, size_t, size_t *);
 static enum b_status stdio_seek(b_stream *, long long, b_stream_seek_origin);
 static enum b_status stdio_tell(const b_stream *, size_t *);
 
@@ -661,22 +637,7 @@ b_stream_buffer *b_stream_buffer_create(void *buf, size_t len)
 
 b_stream *b_stream_open_fp(FILE *fp)
 {
-	b_stream *stream = b_object_create(B_TYPE_STREAM);
-	if (!stream) {
-		return NULL;
-	}
-
-	struct stream_data p;
-	stream_get_data(stream, &p);
-
-	p.s_cfg->s_mode = B_STREAM_READ | B_STREAM_WRITE;
-	p.s_private->s_ptr0 = fp;
-	p.s_ops->s_read = stdio_read;
-	p.s_ops->s_write = stdio_write;
-	p.s_ops->s_seek = stdio_seek;
-	p.s_ops->s_tell = stdio_tell;
-
-	return stream;
+	return init_stdio_stream(fp, B_STREAM_READ | B_STREAM_WRITE);
 }
 
 enum b_status b_stream_reserve(b_stream *stream, size_t len)
@@ -869,7 +830,7 @@ static void stdio_stream_fini(b_object *obj, void *priv)
 }
 
 static enum b_status stdio_read(
-	b_stream *stream, unsigned char *out, size_t max, size_t *nr_read)
+	b_stream *stream, void *out, size_t max, size_t *nr_read)
 {
 	struct b_stdio_stream_p *p
 		= b_object_get_private(stream, B_TYPE_STDIO_STREAM);
@@ -887,7 +848,7 @@ static enum b_status stdio_read(
 }
 
 static enum b_status stdio_write(
-	b_stream *stream, const unsigned char *data, size_t count, size_t *nr_written)
+	b_stream *stream, const void *data, size_t count, size_t *nr_written)
 {
 	struct b_stdio_stream_p *p
 		= b_object_get_private(stream, B_TYPE_STDIO_STREAM);
diff --git a/core/stringstream.c b/core/stringstream.c
index a535da1..1c0297f 100644
--- a/core/stringstream.c
+++ b/core/stringstream.c
@@ -194,7 +194,7 @@ static void stringstream_fini(b_object *obj, void *priv)
 }
 
 enum b_status stream_write(
-	b_stream *stream, const unsigned char *buf, size_t count, size_t *nr_written)
+	b_stream *stream, const void *buf, size_t count, size_t *nr_written)
 {
 	struct b_stringstream_p *s
 		= b_object_get_private(stream, B_TYPE_STRINGSTREAM);