[rsync/rsync.git] / token.c

/* 
   Copyright (C) Andrew Tridgell 1996
   Copyright (C) Paul Mackerras 1996
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "rsync.h"
#include "lib/zlib.h"

extern int do_compression;


/* non-compressing recv token */
static int simple_recv_token(int f,char **data)
{
	static int residue;
	static char *buf;
	int n;

	if (!buf) {
		buf = (char *)malloc(CHUNK_SIZE);
		if (!buf) out_of_memory("simple_recv_token");
	}

	if (residue == 0) {
		int i = read_int(f);
		if (i <= 0) return i;
		residue = i;
	}

	*data = buf;
	n = MIN(CHUNK_SIZE,residue);
	residue -= n;
	read_buf(f,buf,n);
	return n;
}


/* non-compressing send token */
static void simple_send_token(int f,int token,
			      struct map_struct *buf,OFF_T offset,int n)
{
	if (n > 0) {
		int l = 0;
		while (l < n) {
			int n1 = MIN(CHUNK_SIZE,n-l);
			write_int(f,n1);
			write_buf(f,map_ptr(buf,offset+l,n1),n1);
			l += n1;
		}
	}
	/* a -2 token means to send data only and no token */
	if (token != -2) {
		write_int(f,-(token+1));
	}
}


/* Memory allocation/freeing routines, called by zlib stuff. */
static void *
z_alloc(void *opaque, uInt items, uInt size)
{
    return malloc(items * size);
}

static void
z_free(void *opaque, void *adrs, uInt nbytes)
{
    free(adrs);
}

/* Flag bytes in compressed stream are encoded as follows: */
#define END_FLAG	0	/* that's all folks */
#define TOKEN_LONG	0x20	/* followed by 32-bit token number */
#define TOKENRUN_LONG	0x21	/* ditto with 16-bit run count */
#define DEFLATED_DATA	0x40	/* + 6-bit high len, then low len byte */
#define TOKEN_REL	0x80	/* + 6-bit relative token number */
#define TOKENRUN_REL	0xc0	/* ditto with 16-bit run count */

#define MAX_DATA_COUNT	16383	/* fit 14 bit count into 2 bytes with flags */

/* For coding runs of tokens */
static int last_token = -1;
static int run_start;
static int last_run_end;

/* Deflation state */
static z_stream tx_strm;

/* Output buffer */
static char *obuf;

/* Send a deflated token */
static void
send_deflated_token(int f, int token,
		    struct map_struct *buf, OFF_T offset, int nb, int toklen)
{
    int n, r;
    static int init_done;

    if (last_token == -1) {
	/* initialization */
	if (!init_done) {
	    tx_strm.next_in = NULL;
	    tx_strm.zalloc = z_alloc;
	    tx_strm.zfree = z_free;
	    if (deflateInit2(&tx_strm, Z_DEFAULT_COMPRESSION, 8,
			     -15, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
		rprintf(FERROR, "compression init failed\n");
		exit_cleanup(1);
	    }
	    if ((obuf = malloc(MAX_DATA_COUNT+2)) == NULL)
		out_of_memory("send_deflated_token");
	    init_done = 1;
	} else
	    deflateReset(&tx_strm);
	run_start = token;
	last_run_end = 0;

    } else if (nb != 0 || token != last_token + 1
	       || token >= run_start + 65536) {
	/* output previous run */
	r = run_start - last_run_end;
	n = last_token - run_start;
	if (r >= 0 && r <= 63) {
	    write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r);
	} else {
	    write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG));
	    write_int(f, run_start);
	}
	if (n != 0) {
	    write_byte(f, n);
	    write_byte(f, n >> 8);
	}
	last_run_end = last_token;
	run_start = token;
    }

    last_token = token;

    if (nb != 0) {
	/* deflate the data starting at offset */
	tx_strm.avail_in = 0;
	tx_strm.avail_out = 0;
	do {
	    if (tx_strm.avail_in == 0 && nb != 0) {
		/* give it some more input */
		n = MIN(nb, CHUNK_SIZE);
		tx_strm.next_in = (Bytef *)map_ptr(buf, offset, n);
		tx_strm.avail_in = n;
		nb -= n;
		offset += n;
	    }
	    if (tx_strm.avail_out == 0) {
		tx_strm.next_out = (Bytef *)(obuf + 2);
		tx_strm.avail_out = MAX_DATA_COUNT;
	    }
	    r = deflate(&tx_strm, nb? Z_NO_FLUSH: Z_PACKET_FLUSH);
	    if (r != Z_OK) {
		rprintf(FERROR, "deflate returned %d\n", r);
		exit_cleanup(1);
	    }
	    if (nb == 0 || tx_strm.avail_out == 0) {
		n = MAX_DATA_COUNT - tx_strm.avail_out;
		if (n > 0) {
		    obuf[0] = DEFLATED_DATA + (n >> 8);
		    obuf[1] = n;
		    write_buf(f, obuf, n+2);
		}
	    }
	} while (nb != 0 || tx_strm.avail_out == 0);
    }

    if (token != -1) {
	/* add the data in the current block to the compressor's
	   history and hash table */
	tx_strm.next_in = (Bytef *)map_ptr(buf, offset, toklen);
	tx_strm.avail_in = toklen;
	tx_strm.next_out = NULL;
	tx_strm.avail_out = 2 * toklen;
	r = deflate(&tx_strm, Z_INSERT_ONLY);
	if (r != Z_OK || tx_strm.avail_in != 0) {
	    rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n",
		    r, tx_strm.avail_in);
	    exit_cleanup(1);
	}

    } else {
	/* end of file - clean up */
	write_byte(f, END_FLAG);
    }
}


/* tells us what the receiver is in the middle of doing */
static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state;

/* for inflating stuff */
static z_stream rx_strm;
static char *cbuf;
static char *dbuf;

/* for decoding runs of tokens */
static int rx_token;
static int rx_run;

/* Receive a deflated token and inflate it */
static int
recv_deflated_token(int f, char **data)
{
    int n, r, flag;
    static int init_done;
    static int saved_flag;

    for (;;) {
	switch (recv_state) {
	case r_init:
	    if (!init_done) {
		rx_strm.next_out = NULL;
		rx_strm.zalloc = z_alloc;
		rx_strm.zfree = z_free;
		if (inflateInit2(&rx_strm, -15) != Z_OK) {
		    rprintf(FERROR, "inflate init failed\n");
		    exit_cleanup(1);
		}
		if ((cbuf = malloc(MAX_DATA_COUNT)) == NULL
		    || (dbuf = malloc(CHUNK_SIZE)) == NULL)
		    out_of_memory("recv_deflated_token");
		init_done = 1;
	    } else {
		inflateReset(&rx_strm);
	    }
	    recv_state = r_idle;
	    rx_token = 0;
	    break;
	    
	case r_idle:
	case r_inflated:
	    if (saved_flag) {
		flag = saved_flag & 0xff;
		saved_flag = 0;
	    } else
		flag = read_byte(f);
	    if ((flag & 0xC0) == DEFLATED_DATA) {
		n = ((flag & 0x3f) << 8) + read_byte(f);
		read_buf(f, cbuf, n);
		rx_strm.next_in = (Bytef *)cbuf;
		rx_strm.avail_in = n;
		recv_state = r_inflating;
		break;
	    }
	    if (recv_state == r_inflated) {
		/* check previous inflated stuff ended correctly */
		rx_strm.avail_in = 0;
		rx_strm.next_out = (Bytef *)dbuf;
		rx_strm.avail_out = CHUNK_SIZE;
		r = inflate(&rx_strm, Z_PACKET_FLUSH);
		n = CHUNK_SIZE - rx_strm.avail_out;
		if (r != Z_OK) {
		    rprintf(FERROR, "inflate flush returned %d (%d bytes)\n",
			    r, n);
		    exit_cleanup(1);
		}
		if (n != 0) {
		    /* have to return some more data and
		       save the flag for later. */
		    saved_flag = flag + 0x10000;
		    if (rx_strm.avail_out != 0)
			recv_state = r_idle;
		    *data = dbuf;
		    return n;
		}
		recv_state = r_idle;
	    }
	    if (flag == END_FLAG) {
		/* that's all folks */
		recv_state = r_init;
		return 0;
	    }

	    /* here we have a token of some kind */
	    if (flag & TOKEN_REL) {
		rx_token += flag & 0x3f;
		flag >>= 6;
	    } else
		rx_token = read_int(f);
	    if (flag & 1) {
		rx_run = read_byte(f);
		rx_run += read_byte(f) << 8;
		recv_state = r_running;
	    }
	    return -1 - rx_token;

	case r_inflating:
	    rx_strm.next_out = (Bytef *)dbuf;
	    rx_strm.avail_out = CHUNK_SIZE;
	    r = inflate(&rx_strm, Z_NO_FLUSH);
	    n = CHUNK_SIZE - rx_strm.avail_out;
	    if (r != Z_OK) {
		rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n);
		exit_cleanup(1);
	    }
	    if (rx_strm.avail_in == 0)
		recv_state = r_inflated;
	    if (n != 0) {
		*data = dbuf;
		return n;
	    }
	    break;

	case r_running:
	    ++rx_token;
	    if (--rx_run == 0)
		recv_state = r_idle;
	    return -1 - rx_token;
	}
    }
}

/*
 * put the data corresponding to a token that we've just returned
 * from recv_deflated_token into the decompressor's history buffer.
 */
void
see_deflate_token(char *buf, int len)
{
    int r;

    rx_strm.next_in = (Bytef *)buf;
    rx_strm.avail_in = len;
    r = inflateIncomp(&rx_strm);
    if (r != Z_OK) {
	rprintf(FERROR, "inflateIncomp returned %d\n", r);
	exit_cleanup(1);
    }
}

/*
 * transmit a verbatim buffer of length n followed by a token 
 * If token == -1 then we have reached EOF 
 * If n == 0 then don't send a buffer
 */
void send_token(int f,int token,struct map_struct *buf,OFF_T offset,
		int n,int toklen)
{
  if (!do_compression) {
    simple_send_token(f,token,buf,offset,n);
  } else {
    send_deflated_token(f, token, buf, offset, n, toklen);
  }
}


/*
 * receive a token or buffer from the other end. If the reurn value is >0 then
 * it is a data buffer of that length, and *data will point at the data.
 * if the return value is -i then it represents token i-1
 * if the return value is 0 then the end has been reached
 */
int recv_token(int f,char **data)
{
  int tok;

  if (!do_compression) {
    tok = simple_recv_token(f,data);
  } else {
    tok = recv_deflated_token(f, data);
  }
  return tok;
}

/*
 * look at the data corresponding to a token, if necessary
 */
void see_token(char *data, int toklen)
{
    if (do_compression)
	see_deflate_token(data, toklen);
}
Commit	Line	Data
70d794dc AT	1	/*
	2	Copyright (C) Andrew Tridgell 1996
	3	Copyright (C) Paul Mackerras 1996
	4
	5	This program is free software; you can redistribute it and/or modify
	6	it under the terms of the GNU General Public License as published by
	7	the Free Software Foundation; either version 2 of the License, or
	8	(at your option) any later version.
	9
	10	This program is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	GNU General Public License for more details.
	14
	15	You should have received a copy of the GNU General Public License
	16	along with this program; if not, write to the Free Software
	17	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	18	*/
	19
	20	#include "rsync.h"
861c20b4	21	#include "lib/zlib.h"
70d794dc AT	22
	23	extern int do_compression;
	24
	25
	26	/* non-compressing recv token */
	27	static int simple_recv_token(int f,char **data)
	28	{
c5eb3650 AT	29	static int residue;
	30	static char *buf;
	31	int n;
70d794dc	32
c5eb3650 AT	33	if (!buf) {
	34	buf = (char *)malloc(CHUNK_SIZE);
	35	if (!buf) out_of_memory("simple_recv_token");
	36	}
70d794dc	37
c5eb3650 AT	38	if (residue == 0) {
	39	int i = read_int(f);
	40	if (i <= 0) return i;
	41	residue = i;
	42	}
70d794dc	43
c5eb3650 AT	44	*data = buf;
	45	n = MIN(CHUNK_SIZE,residue);
	46	residue -= n;
	47	read_buf(f,buf,n);
	48	return n;
70d794dc AT	49	}
	50
	51
	52	/* non-compressing send token */
c6e7fcb4	53	static void simple_send_token(int f,int token,
45f133b9	54	struct map_struct *buf,OFF_T offset,int n)
70d794dc	55	{
c5eb3650 AT	56	if (n > 0) {
	57	int l = 0;
	58	while (l < n) {
	59	int n1 = MIN(CHUNK_SIZE,n-l);
	60	write_int(f,n1);
	61	write_buf(f,map_ptr(buf,offset+l,n1),n1);
	62	l += n1;
	63	}
	64	}
45f133b9 AT	65	/* a -2 token means to send data only and no token */
	66	if (token != -2) {
	67	write_int(f,-(token+1));
	68	}
70d794dc AT	69	}
	70
	71
861c20b4 PM	72	/* Memory allocation/freeing routines, called by zlib stuff. */
	73	static void *
	74	z_alloc(void *opaque, uInt items, uInt size)
	75	{
	76	return malloc(items * size);
	77	}
	78
	79	static void
	80	z_free(void opaque, void adrs, uInt nbytes)
	81	{
	82	free(adrs);
	83	}
	84
	85	/* Flag bytes in compressed stream are encoded as follows: */
	86	#define END_FLAG 0 /* that's all folks */
	87	#define TOKEN_LONG 0x20 /* followed by 32-bit token number */
	88	#define TOKENRUN_LONG 0x21 /* ditto with 16-bit run count */
	89	#define DEFLATED_DATA 0x40 /* + 6-bit high len, then low len byte */
	90	#define TOKEN_REL 0x80 /* + 6-bit relative token number */
	91	#define TOKENRUN_REL 0xc0 /* ditto with 16-bit run count */
	92
	93	#define MAX_DATA_COUNT 16383 /* fit 14 bit count into 2 bytes with flags */
	94
	95	/* For coding runs of tokens */
	96	static int last_token = -1;
	97	static int run_start;
	98	static int last_run_end;
	99
	100	/* Deflation state */
	101	static z_stream tx_strm;
	102
	103	/* Output buffer */
3a6a366f	104	static char *obuf;
861c20b4 PM	105
	106	/* Send a deflated token */
	107	static void
	108	send_deflated_token(int f, int token,
45f133b9	109	struct map_struct *buf, OFF_T offset, int nb, int toklen)
861c20b4 PM	110	{
	111	int n, r;
	112	static int init_done;
	113
	114	if (last_token == -1) {
	115	/* initialization */
	116	if (!init_done) {
	117	tx_strm.next_in = NULL;
	118	tx_strm.zalloc = z_alloc;
	119	tx_strm.zfree = z_free;
	120	if (deflateInit2(&tx_strm, Z_DEFAULT_COMPRESSION, 8,
f8062104	121	-15, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
9486289c	122	rprintf(FERROR, "compression init failed\n");
861c20b4 PM	123	exit_cleanup(1);
	124	}
	125	if ((obuf = malloc(MAX_DATA_COUNT+2)) == NULL)
	126	out_of_memory("send_deflated_token");
	127	init_done = 1;
	128	} else
	129	deflateReset(&tx_strm);
	130	run_start = token;
	131	last_run_end = 0;
	132
	133	} else if (nb != 0 \|\| token != last_token + 1
	134	\|\| token >= run_start + 65536) {
	135	/* output previous run */
	136	r = run_start - last_run_end;
	137	n = last_token - run_start;
	138	if (r >= 0 && r <= 63) {
	139	write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r);
	140	} else {
	141	write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG));
	142	write_int(f, run_start);
	143	}
	144	if (n != 0) {
	145	write_byte(f, n);
	146	write_byte(f, n >> 8);
	147	}
	148	last_run_end = last_token;
	149	run_start = token;
	150	}
	151
	152	last_token = token;
	153
	154	if (nb != 0) {
	155	/* deflate the data starting at offset */
	156	tx_strm.avail_in = 0;
	157	tx_strm.avail_out = 0;
	158	do {
	159	if (tx_strm.avail_in == 0 && nb != 0) {
	160	/* give it some more input */
	161	n = MIN(nb, CHUNK_SIZE);
1634f4c4	162	tx_strm.next_in = (Bytef *)map_ptr(buf, offset, n);
861c20b4 PM	163	tx_strm.avail_in = n;
	164	nb -= n;
	165	offset += n;
	166	}
	167	if (tx_strm.avail_out == 0) {
1634f4c4	168	tx_strm.next_out = (Bytef *)(obuf + 2);
861c20b4 PM	169	tx_strm.avail_out = MAX_DATA_COUNT;
	170	}
	171	r = deflate(&tx_strm, nb? Z_NO_FLUSH: Z_PACKET_FLUSH);
	172	if (r != Z_OK) {
9486289c	173	rprintf(FERROR, "deflate returned %d\n", r);
861c20b4 PM	174	exit_cleanup(1);
	175	}
	176	if (nb == 0 \|\| tx_strm.avail_out == 0) {
	177	n = MAX_DATA_COUNT - tx_strm.avail_out;
	178	if (n > 0) {
	179	obuf[0] = DEFLATED_DATA + (n >> 8);
	180	obuf[1] = n;
	181	write_buf(f, obuf, n+2);
	182	}
	183	}
	184	} while (nb != 0 \|\| tx_strm.avail_out == 0);
	185	}
	186
	187	if (token != -1) {
	188	/* add the data in the current block to the compressor's
	189	history and hash table */
1634f4c4	190	tx_strm.next_in = (Bytef *)map_ptr(buf, offset, toklen);
861c20b4 PM	191	tx_strm.avail_in = toklen;
	192	tx_strm.next_out = NULL;
	193	tx_strm.avail_out = 2 * toklen;
	194	r = deflate(&tx_strm, Z_INSERT_ONLY);
	195	if (r != Z_OK \|\| tx_strm.avail_in != 0) {
9486289c	196	rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n",
861c20b4 PM	197	r, tx_strm.avail_in);
	198	exit_cleanup(1);
	199	}
	200
	201	} else {
	202	/* end of file - clean up */
	203	write_byte(f, END_FLAG);
	204	}
	205	}
	206
	207
	208	/* tells us what the receiver is in the middle of doing */
	209	static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state;
70d794dc	210
861c20b4 PM	211	/* for inflating stuff */
	212	static z_stream rx_strm;
	213	static char *cbuf;
	214	static char *dbuf;
	215
	216	/* for decoding runs of tokens */
	217	static int rx_token;
	218	static int rx_run;
	219
	220	/* Receive a deflated token and inflate it */
	221	static int
	222	recv_deflated_token(int f, char **data)
	223	{
	224	int n, r, flag;
3a6a366f AT	225	static int init_done;
3a6a366f AT	226	static int saved_flag;
861c20b4 PM	227
	228	for (;;) {
	229	switch (recv_state) {
	230	case r_init:
	231	if (!init_done) {
	232	rx_strm.next_out = NULL;
	233	rx_strm.zalloc = z_alloc;
	234	rx_strm.zfree = z_free;
	235	if (inflateInit2(&rx_strm, -15) != Z_OK) {
9486289c	236	rprintf(FERROR, "inflate init failed\n");
861c20b4 PM	237	exit_cleanup(1);
	238	}
	239	if ((cbuf = malloc(MAX_DATA_COUNT)) == NULL
	240	\|\| (dbuf = malloc(CHUNK_SIZE)) == NULL)
	241	out_of_memory("recv_deflated_token");
	242	init_done = 1;
	243	} else {
	244	inflateReset(&rx_strm);
	245	}
	246	recv_state = r_idle;
5be59dc5	247	rx_token = 0;
861c20b4 PM	248	break;
	249
	250	case r_idle:
	251	case r_inflated:
b8d4524b PM	252	if (saved_flag) {
	253	flag = saved_flag & 0xff;
	254	saved_flag = 0;
	255	} else
	256	flag = read_byte(f);
861c20b4 PM	257	if ((flag & 0xC0) == DEFLATED_DATA) {
	258	n = ((flag & 0x3f) << 8) + read_byte(f);
	259	read_buf(f, cbuf, n);
1634f4c4	260	rx_strm.next_in = (Bytef *)cbuf;
861c20b4 PM	261	rx_strm.avail_in = n;
	262	recv_state = r_inflating;
	263	break;
	264	}
	265	if (recv_state == r_inflated) {
	266	/* check previous inflated stuff ended correctly */
	267	rx_strm.avail_in = 0;
1634f4c4	268	rx_strm.next_out = (Bytef *)dbuf;
861c20b4 PM	269	rx_strm.avail_out = CHUNK_SIZE;
	270	r = inflate(&rx_strm, Z_PACKET_FLUSH);
	271	n = CHUNK_SIZE - rx_strm.avail_out;
b8d4524b	272	if (r != Z_OK) {
9486289c	273	rprintf(FERROR, "inflate flush returned %d (%d bytes)\n",
861c20b4 PM	274	r, n);
	275	exit_cleanup(1);
	276	}
b8d4524b PM	277	if (n != 0) {
	278	/* have to return some more data and
	279	save the flag for later. */
	280	saved_flag = flag + 0x10000;
	281	if (rx_strm.avail_out != 0)
	282	recv_state = r_idle;
	283	*data = dbuf;
	284	return n;
	285	}
861c20b4 PM	286	recv_state = r_idle;
	287	}
	288	if (flag == END_FLAG) {
	289	/* that's all folks */
	290	recv_state = r_init;
	291	return 0;
	292	}
	293
	294	/* here we have a token of some kind */
	295	if (flag & TOKEN_REL) {
	296	rx_token += flag & 0x3f;
	297	flag >>= 6;
	298	} else
	299	rx_token = read_int(f);
	300	if (flag & 1) {
	301	rx_run = read_byte(f);
	302	rx_run += read_byte(f) << 8;
	303	recv_state = r_running;
	304	}
	305	return -1 - rx_token;
	306
	307	case r_inflating:
1634f4c4	308	rx_strm.next_out = (Bytef *)dbuf;
861c20b4 PM	309	rx_strm.avail_out = CHUNK_SIZE;
	310	r = inflate(&rx_strm, Z_NO_FLUSH);
	311	n = CHUNK_SIZE - rx_strm.avail_out;
280cbb85	312	if (r != Z_OK) {
9486289c	313	rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n);
861c20b4 PM	314	exit_cleanup(1);
861c20b4 PM	315	}
b8d4524b	316	if (rx_strm.avail_in == 0)
861c20b4	317	recv_state = r_inflated;
280cbb85 PM	318	if (n != 0) {
	319	*data = dbuf;
	320	return n;
	321	}
	322	break;
861c20b4 PM	323
	324	case r_running:
	325	++rx_token;
	326	if (--rx_run == 0)
	327	recv_state = r_idle;
	328	return -1 - rx_token;
	329	}
	330	}
	331	}
	332
	333	/*
	334	* put the data corresponding to a token that we've just returned
	335	* from recv_deflated_token into the decompressor's history buffer.
	336	*/
	337	void
	338	see_deflate_token(char *buf, int len)
	339	{
	340	int r;
	341
1634f4c4	342	rx_strm.next_in = (Bytef *)buf;
861c20b4 PM	343	rx_strm.avail_in = len;
	344	r = inflateIncomp(&rx_strm);
	345	if (r != Z_OK) {
9486289c	346	rprintf(FERROR, "inflateIncomp returned %d\n", r);
861c20b4 PM	347	exit_cleanup(1);
	348	}
	349	}
70d794dc AT	350
	351	/*
	352	* transmit a verbatim buffer of length n followed by a token
	353	* If token == -1 then we have reached EOF
	354	* If n == 0 then don't send a buffer
70d794dc	355	*/
45f133b9	356	void send_token(int f,int token,struct map_struct *buf,OFF_T offset,
9e31c482	357	int n,int toklen)
70d794dc AT	358	{
	359	if (!do_compression) {
	360	simple_send_token(f,token,buf,offset,n);
861c20b4 PM	361	} else {
861c20b4 PM	362	send_deflated_token(f, token, buf, offset, n, toklen);
70d794dc	363	}
70d794dc AT	364	}
	365
	366
	367	/*
	368	* receive a token or buffer from the other end. If the reurn value is >0 then
	369	* it is a data buffer of that length, and *data will point at the data.
	370	* if the return value is -i then it represents token i-1
	371	* if the return value is 0 then the end has been reached
	372	*/
	373	int recv_token(int f,char **data)
	374	{
861c20b4 PM	375	int tok;
861c20b4 PM	376
70d794dc	377	if (!do_compression) {
861c20b4 PM	378	tok = simple_recv_token(f,data);
	379	} else {
	380	tok = recv_deflated_token(f, data);
70d794dc	381	}
861c20b4 PM	382	return tok;
	383	}
	384
	385	/*
	386	* look at the data corresponding to a token, if necessary
	387	*/
	388	void see_token(char *data, int toklen)
	389	{
861c20b4 PM	390	if (do_compression)
861c20b4 PM	391	see_deflate_token(data, toklen);
70d794dc	392	}