CSE2410 Fall 2014 Bounce

/*

 * Copyright (c) 2000-2004 Niels Provos <provos@citi.umich.edu>

 * Copyright (c) 2008      Marc Alexander Lehmann <libev@schmorp.de>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. 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.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.

 */

#ifdef __cplusplus

extern "C" {

#endif

#ifdef _WIN32

# define WIN32_LEAN_AND_MEAN

# include <windows.h>

# undef WIN32_LEAN_AND_MEAN

typedef unsigned char u_char;

typedef unsigned short u_short;

#else

# include <sys/types.h>

# include <sys/time.h>

# include <inttypes.h>

#endif

#include <stdarg.h>

/* Fix so that ppl dont have to run with <sys/queue.h> */

#ifndef TAILQ_ENTRY

#define _EVENT_DEFINED_TQENTRY

#define TAILQ_ENTRY(type)                                                \

struct {                                                                \

        struct type *tqe_next;        /* next element */                        \

        struct type **tqe_prev;        /* address of previous next element */        \

}

#endif /* !TAILQ_ENTRY */

#ifndef RB_ENTRY

#define _EVENT_DEFINED_RBENTRY

#define RB_ENTRY(type)                                                        \

struct {                                                                \

        struct type *rbe_left;                /* left element */                \

        struct type *rbe_right;                /* right element */                \

        struct type *rbe_parent;        /* parent element */                \

        int rbe_color;                        /* node color */                \

}

#endif /* !RB_ENTRY */

/*

 * Key-Value pairs.  Can be used for HTTP headers but also for

 * query argument parsing.

 */

struct evkeyval {

        TAILQ_ENTRY(evkeyval) next;

        char *key;

        char *value;

};

#ifdef _EVENT_DEFINED_TQENTRY

#undef TAILQ_ENTRY

struct event_list;

struct evkeyvalq;

#undef _EVENT_DEFINED_TQENTRY

#else

TAILQ_HEAD (event_list, event);

TAILQ_HEAD (evkeyvalq, evkeyval);

#endif /* _EVENT_DEFINED_TQENTRY */

#ifdef _EVENT_DEFINED_RBENTRY

#undef RB_ENTRY

#undef _EVENT_DEFINED_RBENTRY

#endif /* _EVENT_DEFINED_RBENTRY */

struct eventop {

        char *name;

        void *(*init)(struct event_base *);

        int (*add)(void *, struct event *);

        int (*del)(void *, struct event *);

        int (*recalc)(struct event_base *, void *, int);

        int (*dispatch)(struct event_base *, void *, struct timeval *);

        void (*dealloc)(struct event_base *, void *);

};

/* These functions deal with buffering input and output */

struct evbuffer {

        u_char *buffer;

        u_char *orig_buffer;

        size_t misalign;

        size_t totallen;

        size_t off;

        void (*cb)(struct evbuffer *, size_t, size_t, void *);

        void *cbarg;

};

/* Just for error reporting - use other constants otherwise */

#define EVBUFFER_READ                0x01

#define EVBUFFER_WRITE                0x02

#define EVBUFFER_EOF                0x10

#define EVBUFFER_ERROR                0x20

#define EVBUFFER_TIMEOUT        0x40

struct bufferevent;

typedef void (*evbuffercb)(struct bufferevent *, void *);

typedef void (*everrorcb)(struct bufferevent *, short what, void *);

struct event_watermark {

        size_t low;

        size_t high;

};

struct bufferevent {

        struct event ev_read;

        struct event ev_write;

        struct evbuffer *input;

        struct evbuffer *output;

        struct event_watermark wm_read;

        struct event_watermark wm_write;

        evbuffercb readcb;

        evbuffercb writecb;

        everrorcb errorcb;

        void *cbarg;

        int timeout_read;        /* in seconds */

        int timeout_write;        /* in seconds */

        short enabled;        /* events that are currently enabled */

};

struct bufferevent *bufferevent_new(int fd,

    evbuffercb readcb, evbuffercb writecb, everrorcb errorcb, void *cbarg);

int bufferevent_base_set(struct event_base *base, struct bufferevent *bufev);

int bufferevent_priority_set(struct bufferevent *bufev, int pri);

void bufferevent_free(struct bufferevent *bufev);

int bufferevent_write(struct bufferevent *bufev, const void *data, size_t size);

int bufferevent_write_buffer(struct bufferevent *bufev, struct evbuffer *buf);

size_t bufferevent_read(struct bufferevent *bufev, void *data, size_t size);

int bufferevent_enable(struct bufferevent *bufev, short event);

int bufferevent_disable(struct bufferevent *bufev, short event);

void bufferevent_settimeout(struct bufferevent *bufev,

    int timeout_read, int timeout_write);

#define EVBUFFER_LENGTH(x)        (x)->off

#define EVBUFFER_DATA(x)        (x)->buffer

#define EVBUFFER_INPUT(x)        (x)->input

#define EVBUFFER_OUTPUT(x)        (x)->output

struct evbuffer *evbuffer_new(void);

void evbuffer_free(struct evbuffer *);

int evbuffer_expand(struct evbuffer *, size_t);

int evbuffer_add(struct evbuffer *, const void *, size_t);

int evbuffer_remove(struct evbuffer *, void *, size_t);

char *evbuffer_readline(struct evbuffer *);

int evbuffer_add_buffer(struct evbuffer *, struct evbuffer *);

int evbuffer_add_printf(struct evbuffer *, const char *fmt, ...);

int evbuffer_add_vprintf(struct evbuffer *, const char *fmt, va_list ap);

void evbuffer_drain(struct evbuffer *, size_t);

int evbuffer_write(struct evbuffer *, int);

int evbuffer_read(struct evbuffer *, int, int);

u_char *evbuffer_find(struct evbuffer *, const u_char *, size_t);

void evbuffer_setcb(struct evbuffer *, void (*)(struct evbuffer *, size_t, size_t, void *), void *);

/* 

 * Marshaling tagged data - We assume that all tags are inserted in their

 * numeric order - so that unknown tags will always be higher than the

 * known ones - and we can just ignore the end of an event buffer.

 */

void evtag_init(void);

void evtag_marshal(struct evbuffer *evbuf, uint32_t tag, const void *data,

    uint32_t len);

void encode_int(struct evbuffer *evbuf, uint32_t number);

void evtag_marshal_int(struct evbuffer *evbuf, uint32_t tag, uint32_t integer);

void evtag_marshal_string(struct evbuffer *buf, uint32_t tag,

    const char *string);

void evtag_marshal_timeval(struct evbuffer *evbuf, uint32_t tag,

    struct timeval *tv);

int evtag_unmarshal(struct evbuffer *src, uint32_t *ptag, struct evbuffer *dst);

int evtag_peek(struct evbuffer *evbuf, uint32_t *ptag);

int evtag_peek_length(struct evbuffer *evbuf, uint32_t *plength);

int evtag_payload_length(struct evbuffer *evbuf, uint32_t *plength);

int evtag_consume(struct evbuffer *evbuf);

int evtag_unmarshal_int(struct evbuffer *evbuf, uint32_t need_tag,

    uint32_t *pinteger);

int evtag_unmarshal_fixed(struct evbuffer *src, uint32_t need_tag, void *data,

    size_t len);

int evtag_unmarshal_string(struct evbuffer *evbuf, uint32_t need_tag,

    char **pstring);

int evtag_unmarshal_timeval(struct evbuffer *evbuf, uint32_t need_tag,

    struct timeval *ptv);

#ifdef __cplusplus

}

#endif