/*******************************************************************************
 * Copyright (c) 2007, 2010 Wind River Systems, Inc. and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v1.0 which accompany this distribution.
 * The Eclipse Public License is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 * You may elect to redistribute this code under either of these licenses.
 *
 * Contributors:
 *     Wind River Systems - initial API and implementation
 *     Michael Sills-Lavoie(École Polytechnique de Montréal)  - ZeroCopy support
 *******************************************************************************/

/*
 * Transport agnostic input buf interface
 */

#ifndef D_input_buf
#define D_input_buf

#include <tcf/config.h>
#include <tcf/framework/streams.h>

typedef struct InputBuf InputBuf;

struct InputBuf {
    size_t buf_size;
    unsigned char * buf;
    unsigned char * inp;
    InputStream * stream;
    int inp_esc;
    int out_esc;
    int eof;                /* EOS is received, the buffer might still have unhandled messages */
    int long_msg;           /* Message is longer then buffer, start handling before EOM */
    int message_count;      /* Number of messages waiting to be dispatched */
    int handling_msg;       /* Channel in the process of handling a message */
#if ENABLE_ZeroCopy
    int out_size_mode;      /* Checking the binary data size */
    size_t out_data_size;   /* Size of the bin data to get */
    int inp_size_mode;      /* (Read done) Checking the binary data size */
    size_t inp_data_size;   /* (Read done) Size of the bin data to get */
#endif
    void (*post_read)(InputBuf *, unsigned char *, size_t);
    void (*wait_read)(InputBuf *);
    void (*trigger_message)(InputBuf *);
};

enum {
    HandleMsgIdle,
    HandleMsgTriggered,
    HandleMsgActive
};

extern void ibuf_init(InputBuf * ibuf, InputStream * inp);
extern void ibuf_trigger_read(InputBuf * ibuf);
extern int ibuf_get_more(InputBuf * ibuf, int peeking);
extern void ibuf_flush(InputBuf * ibuf);
extern void ibuf_read_done(InputBuf * ibuf, size_t len);
extern int ibuf_start_message(InputBuf * ibuf);

#endif /* D_input_buf */