/*
 * 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 */

