/*
 * Copyright (c) 2009-2011, Salvatore Sanfilippo <antirez at gmail dot com>
 * Copyright (c) 2010-2011, Pieter Noordhuis <pcnoordhuis at gmail dot com>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *   * Neither the name of Redis nor the names of its contributors may be used
 *     to endorse or promote products derived from this software without
 *     specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */


#ifndef __HIREDIS_READ_H
#define __HIREDIS_READ_H
#include <stdio.h> /* for size_t */

#define REDIS_ERR -1
#define REDIS_OK 0

/* When an error occurs, the err flag in a context is set to hold the type of
 * error that occurred. REDIS_ERR_IO means there was an I/O error and you
 * should use the "errno" variable to find out what is wrong.
 * For other values, the "errstr" field will hold a description. */
#define REDIS_ERR_IO 1 /* Error in read or write */
#define REDIS_ERR_EOF 3 /* End of file */
#define REDIS_ERR_PROTOCOL 4 /* Protocol error */
#define REDIS_ERR_OOM 5 /* Out of memory */
#define REDIS_ERR_OTHER 2 /* Everything else... */

#define REDIS_REPLY_STRING 1
#define REDIS_REPLY_ARRAY 2
#define REDIS_REPLY_INTEGER 3
#define REDIS_REPLY_NIL 4
#define REDIS_REPLY_STATUS 5
#define REDIS_REPLY_ERROR 6

#define REDIS_READER_MAX_BUF (1024*16)  /* Default max unused reader buffer. */

#ifdef __cplusplus
extern "C" {
#endif

typedef struct redisReadTask {
    int type;
    int elements; /* number of elements in multibulk container */
    int idx; /* index in parent (array) object */
    void *obj; /* holds user-generated value for a read task */
    struct redisReadTask *parent; /* parent task */
    void *privdata; /* user-settable arbitrary field */
} redisReadTask;

typedef struct redisReplyObjectFunctions {
    void *(*createString)(const redisReadTask*, char*, size_t);
    void *(*createArray)(const redisReadTask*, int);
    void *(*createInteger)(const redisReadTask*, long long);
    void *(*createNil)(const redisReadTask*);
    void (*freeObject)(void*);
} redisReplyObjectFunctions;

typedef struct redisReader {
    int err; /* Error flags, 0 when there is no error */
    char errstr[128]; /* String representation of error when applicable */

    char *buf; /* Read buffer */
    size_t pos; /* Buffer cursor */
    size_t len; /* Buffer length */
    size_t maxbuf; /* Max length of unused buffer */

    redisReadTask rstack[9];
    int ridx; /* Index of current read task */
    void *reply; /* Temporary reply pointer */

    redisReplyObjectFunctions *fn;
    void *privdata;
} redisReader;

/* Public API for the protocol parser. */
redisReader *redisReaderCreateWithFunctions(redisReplyObjectFunctions *fn);
void redisReaderFree(redisReader *r);
int redisReaderFeed(redisReader *r, const char *buf, size_t len);
int redisReaderGetReply(redisReader *r, void **reply);

#define redisReaderSetPrivdata(_r, _p) (int)(((redisReader*)(_r))->privdata = (_p))
#define redisReaderGetObject(_r) (((redisReader*)(_r))->reply)
#define redisReaderGetError(_r) (((redisReader*)(_r))->errstr)

#ifdef __cplusplus
}
#endif

#endif