move libevent into base

third_party/libevent/evbuffer.c

Index: third_party/libevent/evbuffer.c
diff --git a/third_party/libevent/evbuffer.c b/third_party/libevent/evbuffer.c
deleted file mode 100644
index f2179a5044f4c2c0d49047704c14c916e7e62d14..0000000000000000000000000000000000000000
--- a/third_party/libevent/evbuffer.c
+++ /dev/null
@@ -1,455 +0,0 @@
-/*
- * Copyright (c) 2002-2004 Niels Provos <provos@citi.umich.edu>
- * 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.
- */
-
-#include <sys/types.h>
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#ifdef HAVE_SYS_TIME_H
-#include <sys/time.h>
-#endif
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#ifdef HAVE_STDARG_H
-#include <stdarg.h>
-#endif
-
-#ifdef WIN32
-#include <winsock2.h>
-#endif
-
-#include "evutil.h"
-#include "event.h"
-
-/* prototypes */
-
-void bufferevent_read_pressure_cb(struct evbuffer *, size_t, size_t, void *);
-
-static int
-bufferevent_add(struct event *ev, int timeout)
-{
-	struct timeval tv, *ptv = NULL;
-
-	if (timeout) {
-		evutil_timerclear(&tv);
-		tv.tv_sec = timeout;
-		ptv = &tv;
-	}
-
-	return (event_add(ev, ptv));
-}
-
-/* 
- * This callback is executed when the size of the input buffer changes.
- * We use it to apply back pressure on the reading side.
- */
-
-void
-bufferevent_read_pressure_cb(struct evbuffer *buf, size_t old, size_t now,
-    void *arg) {
-	struct bufferevent *bufev = arg;
-	/* 
-	 * If we are below the watermark then reschedule reading if it's
-	 * still enabled.
-	 */
-	if (bufev->wm_read.high == 0 || now < bufev->wm_read.high) {
-		evbuffer_setcb(buf, NULL, NULL);
-
-		if (bufev->enabled & EV_READ)
-			bufferevent_add(&bufev->ev_read, bufev->timeout_read);
-	}
-}
-
-static void
-bufferevent_readcb(int fd, short event, void *arg)
-{
-	struct bufferevent *bufev = arg;
-	int res = 0;
-	short what = EVBUFFER_READ;
-	size_t len;
-	int howmuch = -1;
-
-	if (event == EV_TIMEOUT) {
-		what |= EVBUFFER_TIMEOUT;
-		goto error;
-	}
-
-	/*
-	 * If we have a high watermark configured then we don't want to
-	 * read more data than would make us reach the watermark.
-	 */
-	if (bufev->wm_read.high != 0) {
-		howmuch = bufev->wm_read.high - EVBUFFER_LENGTH(bufev->input);
-		/* we might have lowered the watermark, stop reading */
-		if (howmuch <= 0) {
-			struct evbuffer *buf = bufev->input;
-			event_del(&bufev->ev_read);
-			evbuffer_setcb(buf,
-			    bufferevent_read_pressure_cb, bufev);
-			return;
-		}
-	}
-
-	res = evbuffer_read(bufev->input, fd, howmuch);
-	if (res == -1) {
-		if (errno == EAGAIN || errno == EINTR)
-			goto reschedule;
-		/* error case */
-		what |= EVBUFFER_ERROR;
-	} else if (res == 0) {
-		/* eof case */
-		what |= EVBUFFER_EOF;
-	}
-
-	if (res <= 0)
-		goto error;
-
-	bufferevent_add(&bufev->ev_read, bufev->timeout_read);
-
-	/* See if this callbacks meets the water marks */
-	len = EVBUFFER_LENGTH(bufev->input);
-	if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
-		return;
-	if (bufev->wm_read.high != 0 && len >= bufev->wm_read.high) {
-		struct evbuffer *buf = bufev->input;
-		event_del(&bufev->ev_read);
-
-		/* Now schedule a callback for us when the buffer changes */
-		evbuffer_setcb(buf, bufferevent_read_pressure_cb, bufev);
-	}
-
-	/* Invoke the user callback - must always be called last */
-	if (bufev->readcb != NULL)
-		(*bufev->readcb)(bufev, bufev->cbarg);
-	return;
-
- reschedule:
-	bufferevent_add(&bufev->ev_read, bufev->timeout_read);
-	return;
-
- error:
-	(*bufev->errorcb)(bufev, what, bufev->cbarg);
-}
-
-static void
-bufferevent_writecb(int fd, short event, void *arg)
-{
-	struct bufferevent *bufev = arg;
-	int res = 0;
-	short what = EVBUFFER_WRITE;
-
-	if (event == EV_TIMEOUT) {
-		what |= EVBUFFER_TIMEOUT;
-		goto error;
-	}
-
-	if (EVBUFFER_LENGTH(bufev->output)) {
-	    res = evbuffer_write(bufev->output, fd);
-	    if (res == -1) {
-#ifndef WIN32
-/*todo. evbuffer uses WriteFile when WIN32 is set. WIN32 system calls do not
- *set errno. thus this error checking is not portable*/
-		    if (errno == EAGAIN ||
-			errno == EINTR ||
-			errno == EINPROGRESS)
-			    goto reschedule;
-		    /* error case */
-		    what |= EVBUFFER_ERROR;
-
-#else
-				goto reschedule;
-#endif
-
-	    } else if (res == 0) {
-		    /* eof case */
-		    what |= EVBUFFER_EOF;
-	    }
-	    if (res <= 0)
-		    goto error;
-	}
-
-	if (EVBUFFER_LENGTH(bufev->output) != 0)
-		bufferevent_add(&bufev->ev_write, bufev->timeout_write);
-
-	/*
-	 * Invoke the user callback if our buffer is drained or below the
-	 * low watermark.
-	 */
-	if (bufev->writecb != NULL &&
-	    EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
-		(*bufev->writecb)(bufev, bufev->cbarg);
-
-	return;
-
- reschedule:
-	if (EVBUFFER_LENGTH(bufev->output) != 0)
-		bufferevent_add(&bufev->ev_write, bufev->timeout_write);
-	return;
-
- error:
-	(*bufev->errorcb)(bufev, what, bufev->cbarg);
-}
-
-/*
- * Create a new buffered event object.
- *
- * The read callback is invoked whenever we read new data.
- * The write callback is invoked whenever the output buffer is drained.
- * The error callback is invoked on a write/read error or on EOF.
- *
- * Both read and write callbacks maybe NULL.  The error callback is not
- * allowed to be NULL and have to be provided always.
- */
-
-struct bufferevent *
-bufferevent_new(int fd, evbuffercb readcb, evbuffercb writecb,
-    everrorcb errorcb, void *cbarg)
-{
-	struct bufferevent *bufev;
-
-	if ((bufev = calloc(1, sizeof(struct bufferevent))) == NULL)
-		return (NULL);
-
-	if ((bufev->input = evbuffer_new()) == NULL) {
-		free(bufev);
-		return (NULL);
-	}
-
-	if ((bufev->output = evbuffer_new()) == NULL) {
-		evbuffer_free(bufev->input);
-		free(bufev);
-		return (NULL);
-	}
-
-	event_set(&bufev->ev_read, fd, EV_READ, bufferevent_readcb, bufev);
-	event_set(&bufev->ev_write, fd, EV_WRITE, bufferevent_writecb, bufev);
-
-	bufferevent_setcb(bufev, readcb, writecb, errorcb, cbarg);
-
-	/*
-	 * Set to EV_WRITE so that using bufferevent_write is going to
-	 * trigger a callback.  Reading needs to be explicitly enabled
-	 * because otherwise no data will be available.
-	 */
-	bufev->enabled = EV_WRITE;
-
-	return (bufev);
-}
-
-void
-bufferevent_setcb(struct bufferevent *bufev,
-    evbuffercb readcb, evbuffercb writecb, everrorcb errorcb, void *cbarg)
-{
-	bufev->readcb = readcb;
-	bufev->writecb = writecb;
-	bufev->errorcb = errorcb;
-
-	bufev->cbarg = cbarg;
-}
-
-void
-bufferevent_setfd(struct bufferevent *bufev, int fd)
-{
-	event_del(&bufev->ev_read);
-	event_del(&bufev->ev_write);
-
-	event_set(&bufev->ev_read, fd, EV_READ, bufferevent_readcb, bufev);
-	event_set(&bufev->ev_write, fd, EV_WRITE, bufferevent_writecb, bufev);
-	if (bufev->ev_base != NULL) {
-		event_base_set(bufev->ev_base, &bufev->ev_read);
-		event_base_set(bufev->ev_base, &bufev->ev_write);
-	}
-
-	/* might have to manually trigger event registration */
-}
-
-int
-bufferevent_priority_set(struct bufferevent *bufev, int priority)
-{
-	if (event_priority_set(&bufev->ev_read, priority) == -1)
-		return (-1);
-	if (event_priority_set(&bufev->ev_write, priority) == -1)
-		return (-1);
-
-	return (0);
-}
-
-/* Closing the file descriptor is the responsibility of the caller */
-
-void
-bufferevent_free(struct bufferevent *bufev)
-{
-	event_del(&bufev->ev_read);
-	event_del(&bufev->ev_write);
-
-	evbuffer_free(bufev->input);
-	evbuffer_free(bufev->output);
-
-	free(bufev);
-}
-
-/*
- * Returns 0 on success;
- *        -1 on failure.
- */
-
-int
-bufferevent_write(struct bufferevent *bufev, const void *data, size_t size)
-{
-	int res;
-
-	res = evbuffer_add(bufev->output, data, size);
-
-	if (res == -1)
-		return (res);
-
-	/* If everything is okay, we need to schedule a write */
-	if (size > 0 && (bufev->enabled & EV_WRITE))
-		bufferevent_add(&bufev->ev_write, bufev->timeout_write);
-
-	return (res);
-}
-
-int
-bufferevent_write_buffer(struct bufferevent *bufev, struct evbuffer *buf)
-{
-	int res;
-
-	res = bufferevent_write(bufev, buf->buffer, buf->off);
-	if (res != -1)
-		evbuffer_drain(buf, buf->off);
-
-	return (res);
-}
-
-size_t
-bufferevent_read(struct bufferevent *bufev, void *data, size_t size)
-{
-	struct evbuffer *buf = bufev->input;
-
-	if (buf->off < size)
-		size = buf->off;
-
-	/* Copy the available data to the user buffer */
-	memcpy(data, buf->buffer, size);
-
-	if (size)
-		evbuffer_drain(buf, size);
-
-	return (size);
-}
-
-int
-bufferevent_enable(struct bufferevent *bufev, short event)
-{
-	if (event & EV_READ) {
-		if (bufferevent_add(&bufev->ev_read, bufev->timeout_read) == -1)
-			return (-1);
-	}
-	if (event & EV_WRITE) {
-		if (bufferevent_add(&bufev->ev_write, bufev->timeout_write) == -1)
-			return (-1);
-	}
-
-	bufev->enabled |= event;
-	return (0);
-}
-
-int
-bufferevent_disable(struct bufferevent *bufev, short event)
-{
-	if (event & EV_READ) {
-		if (event_del(&bufev->ev_read) == -1)
-			return (-1);
-	}
-	if (event & EV_WRITE) {
-		if (event_del(&bufev->ev_write) == -1)
-			return (-1);
-	}
-
-	bufev->enabled &= ~event;
-	return (0);
-}
-
-/*
- * Sets the read and write timeout for a buffered event.
- */
-
-void
-bufferevent_settimeout(struct bufferevent *bufev,
-    int timeout_read, int timeout_write) {
-	bufev->timeout_read = timeout_read;
-	bufev->timeout_write = timeout_write;
-
-	if (event_pending(&bufev->ev_read, EV_READ, NULL))
-		bufferevent_add(&bufev->ev_read, timeout_read);
-	if (event_pending(&bufev->ev_write, EV_WRITE, NULL))
-		bufferevent_add(&bufev->ev_write, timeout_write);
-}
-
-/*
- * Sets the water marks
- */
-
-void
-bufferevent_setwatermark(struct bufferevent *bufev, short events,
-    size_t lowmark, size_t highmark)
-{
-	if (events & EV_READ) {
-		bufev->wm_read.low = lowmark;
-		bufev->wm_read.high = highmark;
-	}
-
-	if (events & EV_WRITE) {
-		bufev->wm_write.low = lowmark;
-		bufev->wm_write.high = highmark;
-	}
-
-	/* If the watermarks changed then see if we should call read again */
-	bufferevent_read_pressure_cb(bufev->input,
-	    0, EVBUFFER_LENGTH(bufev->input), bufev);
-}
-
-int
-bufferevent_base_set(struct event_base *base, struct bufferevent *bufev)
-{
-	int res;
-
-	bufev->ev_base = base;
-
-	res = event_base_set(base, &bufev->ev_read);
-	if (res == -1)
-		return (res);
-
-	res = event_base_set(base, &bufev->ev_write);
-	return (res);
-}