/*-
 * Copyright (c) 2000-2005 MAEKAWA Masahide <maekawa@cvsync.org>
 * 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. Neither the name of the author 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 AUTHOR 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 AUTHOR 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.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>

#include <errno.h>
#include <pthread.h>
#include <string.h>

#include <zlib.h>

#include "compat_stdbool.h"
#include "compat_stdint.h"
#include "compat_inttypes.h"
#include "basedef.h"

#include "logmsg.h"
#include "mux.h"
#include "mux_zlib.h"
#include "network.h"

#include "receiver.h"

bool
receiver_data_zlib(struct mux *mx, uint8_t chnum)
{
	struct muxbuf *mxb = &mx->mx_buffer[MUX_IN][chnum];
	struct mux_stream_zlib *stream = mx->mx_stream;
	z_stream *z = &stream->ms_zstream_in;
	uint16_t mss;
	uint8_t *cmd = mx->mx_recvcmd;
	size_t len, len1, len2, tail;
	int err, zflag;

	if (!sock_recv(mx->mx_socket, cmd, MUX_CMDLEN_DATA - 2)) {
		logmsg_err("Receiver(DATA) Error: recv");
		return (false);
	}

	mss = GetWord(cmd);
	if ((mss == 0) || (mss > mxb->mxb_mss)) {
		logmsg_err("Receiver(DATA) Error: invalid length: %u", mss);
		return (false);
	}

	if (!sock_recv(mx->mx_socket, stream->ms_zbuffer_in, (size_t)mss)) {
		logmsg_err("Receiver(DATA) Error: recv");
		return (false);
	}

	z->next_in = stream->ms_zbuffer_in;
	z->avail_in = mss;

	do {
		if ((err = pthread_mutex_lock(&mxb->mxb_lock)) != 0) {
			logmsg_err("Receiver(DATA) Error: mutex lock: %s",
				   strerror(err));
			return (false);
		}
		if (mxb->mxb_state != MUX_STATE_RUNNING) {
			logmsg_err("Receiver(DATA) Error: not running: %u",
				   chnum);
			mxb->mxb_state = MUX_STATE_ERROR;
			pthread_mutex_unlock(&mxb->mxb_lock);
			return (false);
		}

		while ((len = mxb->mxb_bufsize - mxb->mxb_length) == 0) {
			logmsg_debug(DEBUG_BASE, "Receriver: Sleep(%u): %u %u",
				     chnum, mxb->mxb_length, mxb->mxb_bufsize);
			if ((err = pthread_cond_wait(&mxb->mxb_wait_in,
						     &mxb->mxb_lock)) != 0) {
				logmsg_err("Receiver(DATA) Error: cond_wait: "
					   "%s", strerror(err));
				mxb->mxb_state = MUX_STATE_ERROR;
				pthread_mutex_unlock(&mxb->mxb_lock);
				return (false);
			}
			logmsg_debug(DEBUG_BASE, "Receriver: Wakeup(%u): %u",
				     chnum, mxb->mxb_length);
			if (mxb->mxb_state != MUX_STATE_RUNNING) {
				logmsg_err("Receiver(DATA) Error: "
					   "not running: %u", chnum);
				mxb->mxb_state = MUX_STATE_ERROR;
				pthread_mutex_unlock(&mxb->mxb_lock);
				return (false);
			}
		}

		tail = mxb->mxb_head + mxb->mxb_length;
		if (tail >= mxb->mxb_bufsize)
			tail -= mxb->mxb_bufsize;
		if ((len1 = tail + len) > mxb->mxb_bufsize) {
			len2 = len1 - mxb->mxb_bufsize;
			len1 = len - len2;
			zflag = 0;
		} else {
			len2 = 0;
			zflag = Z_FINISH;
		}

		z->next_out = &mxb->mxb_buffer[tail];
		z->avail_out = len1;
		err = inflate(z, zflag);
		if ((err != Z_STREAM_END) && (err != Z_OK)) {
			logmsg_err("Receiver(DATA) Error: INFLATE: %s",
				   z->msg);
			mxb->mxb_state = MUX_STATE_ERROR;
			pthread_mutex_unlock(&mxb->mxb_lock);
			return (false);
		}

		if ((z->avail_in != 0) && (len2 > 0)) {
			z->next_out = mxb->mxb_buffer;
			z->avail_out = len2;
			err = inflate(z, Z_FINISH);
			if ((err != Z_STREAM_END) && (err != Z_OK)) {
				logmsg_err("Receiver(DATA) Error: INFLATE: %s",
					   z->msg);
				mxb->mxb_state = MUX_STATE_ERROR;
				pthread_mutex_unlock(&mxb->mxb_lock);
				return (false);
			}
		}

		mx->mx_xfer_in += z->total_out;
		mxb->mxb_length += z->total_out;
		z->total_out = 0;

		if ((err = pthread_cond_signal(&mxb->mxb_wait_out)) != 0) {
			logmsg_err("Receiver(DATA) Error: cond signal: %s",
				   strerror(err));
			mxb->mxb_state = MUX_STATE_ERROR;
			pthread_mutex_unlock(&mxb->mxb_lock);
			return (false);
		}

		if ((err = pthread_mutex_unlock(&mxb->mxb_lock)) != 0) {
			logmsg_err("Receiver(DATA) Error: mutex unlock: %s",
				   strerror(err));
			return(false);
		}
	} while (z->avail_in > 0);

	if (inflateReset(z) != Z_OK) {
		logmsg_err("Receiver(DATA) Error: INFLATE(reset): %s", z->msg);
		return (false);
	}

	return (true);
}