add msgpack_vrefbuffer, msgpack::vrefbuffer

c/vrefbuffer.h

@@ -0,0 +1,97 @@
+/*
+ * MessagePack for C zero-copy buffer implementation
+ *
+ * Copyright (C) 2008-2009 FURUHASHI Sadayuki
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+#ifndef MSGPACK_VREFBUFFER_H__
+#define MSGPACK_VREFBUFFER_H__
+
+#include "msgpack/zone.h"
+#include <sys/uio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#ifndef MSGPACK_VREFBUFFER_REF_SIZE
+#define MSGPACK_VREFBUFFER_REF_SIZE 32
+#endif
+
+#ifndef MSGPACK_VREFBUFFER_CHUNK_SIZE
+#define MSGPACK_VREFBUFFER_CHUNK_SIZE 2048
+#endif
+
+typedef struct msgpack_vrefbuffer_chunk {
+	size_t free;
+	struct msgpack_vrefbuffer_chunk* next;
+	/* data ... */
+} msgpack_vrefbuffer_chunk;
+
+typedef struct msgpack_vrefbuffer {
+	size_t chunk_size;
+	size_t ref_size;
+
+	struct iovec* tail;
+	struct iovec* end;
+	struct iovec* array;
+
+	msgpack_vrefbuffer_chunk* chunk;
+} msgpack_vrefbuffer;
+
+
+bool msgpack_vrefbuffer_init(msgpack_vrefbuffer* vbuf,
+		size_t ref_size, size_t chunk_size);
+void msgpack_vrefbuffer_destroy(msgpack_vrefbuffer* vbuf);
+
+static inline int msgpack_vrefbuffer_write(void* data, const char* buf, unsigned int len);
+
+static inline const struct iovec* msgpack_vrefbuffer_vec(const msgpack_vrefbuffer* vref);
+static inline size_t msgpack_vrefbuffer_veclen(const msgpack_vrefbuffer* vref);
+
+int msgpack_vrefbuffer_append_copy(msgpack_vrefbuffer* vbuf,
+		const char* buf, unsigned int len);
+
+int msgpack_vrefbuffer_append_ref(msgpack_vrefbuffer* vbuf,
+		const char* buf, unsigned int len);
+
+
+int msgpack_vrefbuffer_write(void* data, const char* buf, unsigned int len)
+{
+	msgpack_vrefbuffer* vbuf = (msgpack_vrefbuffer*)data;
+
+	if(len < vbuf->ref_size) {
+		return msgpack_vrefbuffer_append_copy(vbuf, buf, len);
+	} else {
+		return msgpack_vrefbuffer_append_ref(vbuf, buf, len);
+	}
+}
+
+const struct iovec* msgpack_vrefbuffer_vec(const msgpack_vrefbuffer* vref)
+{
+	return vref->array;
+}
+
+size_t msgpack_vrefbuffer_veclen(const msgpack_vrefbuffer* vref)
+{
+	return vref->tail - vref->array;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* msgpack/vrefbuffer.h */
+