[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 "zlib/zlib.h"

extern int do_compression;
static int compression_level = Z_DEFAULT_COMPRESSION;

/* determine the compression level based on a wildcard filename list */
void set_compression(char *fname)
{
	extern int module_id;
	char *dont;
	char *tok;

	if (!do_compression) return;

	compression_level = Z_DEFAULT_COMPRESSION;
	dont = lp_dont_compress(module_id);

	if (!dont || !*dont) return;

	dont = strdup(dont);
	fname = strdup(fname);
	if (!dont || !fname) return;

	strlower(dont);
	strlower(fname);

	for (tok=strtok(dont," ");tok;tok=strtok(NULL," ")) {
		if (fnmatch(tok, fname, 0) == 0) {
			compression_level = 0;
			break;
		}
	}
	free(dont);
	free(fname);
}

/* 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));
	}
}


/* 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, flush_pending;

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

	} else if (last_token == -2) {
		run_start = token;

	} 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 || flush_pending) {
		/* deflate the data starting at offset */
		int flush = Z_NO_FLUSH;
		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;
				if (flush != Z_NO_FLUSH) {
					/*
					 * We left the last 4 bytes in the
					 * buffer, in case they are the
					 * last 4.  Move them to the front.
					 */
					memcpy(tx_strm.next_out,
					       obuf+MAX_DATA_COUNT-2, 4);
					tx_strm.next_out += 4;
					tx_strm.avail_out -= 4;
				}
			}
			if (nb == 0 && token != -2)
				flush = Z_SYNC_FLUSH;
			r = deflate(&tx_strm, flush);
			if (r != Z_OK) {
				rprintf(FERROR, "deflate returned %d\n", r);
				exit_cleanup(RERR_STREAMIO);
			}
			if (nb == 0 || tx_strm.avail_out == 0) {
				n = MAX_DATA_COUNT - tx_strm.avail_out;
				if (flush != Z_NO_FLUSH) {
					/*
					 * We have to trim off the last 4
					 * bytes of output when flushing
					 * (they are just 0, 0, ff, ff).
					 */
					n -= 4;
				}
				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);
		flush_pending = token == -2;
	}

	if (token == -1) {
		/* end of file - clean up */
		write_byte(f, END_FLAG);

	} else if (token != -2) {
		/* 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 = (Bytef *) obuf;
		tx_strm.avail_out = MAX_DATA_COUNT;
		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(RERR_STREAMIO);
		}
	}
}


/* 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 = NULL;
				rx_strm.zfree = NULL;
				if (inflateInit2(&rx_strm, -15) != Z_OK) {
					rprintf(FERROR, "inflate init failed\n");
					exit_cleanup(RERR_STREAMIO);
				}
				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_SYNC_FLUSH);
				n = CHUNK_SIZE - rx_strm.avail_out;
				/*
				 * Z_BUF_ERROR just means no progress was
				 * made, i.e. the decompressor didn't have
				 * any pending output for us.
				 */
				if (r != Z_OK && r != Z_BUF_ERROR) {
					rprintf(FERROR, "inflate flush returned %d (%d bytes)\n",
						r, n);
					exit_cleanup(RERR_STREAMIO);
				}
				if (n != 0 && r != Z_BUF_ERROR) {
					/* have to return some more data and
					   save the flag for later. */
					saved_flag = flag + 0x10000;
					*data = dbuf;
					return n;
				}
				/*
				 * At this point the decompressor should
				 * be expecting to see the 0, 0, ff, ff bytes.
				 */
				if (!inflateSyncPoint(&rx_strm)) {
					rprintf(FERROR, "decompressor lost sync!\n");
					exit_cleanup(RERR_STREAMIO);
				}
				rx_strm.avail_in = 4;
				rx_strm.next_in = (Bytef *)cbuf;
				cbuf[0] = cbuf[1] = 0;
				cbuf[2] = cbuf[3] = 0xff;
				inflate(&rx_strm, Z_SYNC_FLUSH);
				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(RERR_STREAMIO);
			}
			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.
 */
static void see_deflate_token(char *buf, int len)
{
	int r, blklen;
	unsigned char hdr[5];

	rx_strm.avail_in = 0;
	blklen = 0;
	hdr[0] = 0;
	do {
		if (rx_strm.avail_in == 0 && len != 0) {
			if (blklen == 0) {
				/* Give it a fake stored-block header. */
				rx_strm.next_in = (Bytef *)hdr;
				rx_strm.avail_in = 5;
				blklen = len;
				if (blklen > 0xffff)
					blklen = 0xffff;
				hdr[1] = blklen;
				hdr[2] = blklen >> 8;
				hdr[3] = ~hdr[1];
				hdr[4] = ~hdr[2];
			} else {
				rx_strm.next_in = (Bytef *)buf;
				rx_strm.avail_in = blklen;
				len -= blklen;
				blklen = 0;
			}
		}
		rx_strm.next_out = (Bytef *)dbuf;
		rx_strm.avail_out = CHUNK_SIZE;
		r = inflate(&rx_strm, Z_SYNC_FLUSH);
		if (r != Z_OK) {
			rprintf(FERROR, "inflate (token) returned %d\n", r);
			exit_cleanup(RERR_STREAMIO);
		}
	} while (len || rx_strm.avail_out == 0);
}

/*
 * 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"
5914bf15	21	#include "zlib/zlib.h"
70d794dc AT	22
70d794dc AT	23	extern int do_compression;
83fff1aa	24	static int compression_level = Z_DEFAULT_COMPRESSION;
70d794dc	25
83fff1aa AT	26	/* determine the compression level based on a wildcard filename list */
	27	void set_compression(char *fname)
	28	{
	29	extern int module_id;
	30	char *dont;
	31	char *tok;
	32
	33	if (!do_compression) return;
	34
	35	compression_level = Z_DEFAULT_COMPRESSION;
	36	dont = lp_dont_compress(module_id);
	37
	38	if (!dont \|\| !*dont) return;
	39
	40	dont = strdup(dont);
	41	fname = strdup(fname);
	42	if (!dont \|\| !fname) return;
	43
	44	strlower(dont);
	45	strlower(fname);
	46
	47	for (tok=strtok(dont," ");tok;tok=strtok(NULL," ")) {
	48	if (fnmatch(tok, fname, 0) == 0) {
	49	compression_level = 0;
	50	break;
	51	}
	52	}
	53	free(dont);
	54	free(fname);
	55	}
70d794dc AT	56
	57	/* non-compressing recv token */
	58	static int simple_recv_token(int f,char **data)
	59	{
c5eb3650 AT	60	static int residue;
	61	static char *buf;
	62	int n;
70d794dc	63
c5eb3650 AT	64	if (!buf) {
	65	buf = (char *)malloc(CHUNK_SIZE);
	66	if (!buf) out_of_memory("simple_recv_token");
	67	}
70d794dc	68
c5eb3650 AT	69	if (residue == 0) {
	70	int i = read_int(f);
	71	if (i <= 0) return i;
	72	residue = i;
	73	}
70d794dc	74
c5eb3650 AT	75	*data = buf;
	76	n = MIN(CHUNK_SIZE,residue);
	77	residue -= n;
	78	read_buf(f,buf,n);
	79	return n;
70d794dc AT	80	}
	81
	82
	83	/* non-compressing send token */
c6e7fcb4	84	static void simple_send_token(int f,int token,
45f133b9	85	struct map_struct *buf,OFF_T offset,int n)
70d794dc	86	{
c5eb3650 AT	87	if (n > 0) {
	88	int l = 0;
	89	while (l < n) {
	90	int n1 = MIN(CHUNK_SIZE,n-l);
	91	write_int(f,n1);
	92	write_buf(f,map_ptr(buf,offset+l,n1),n1);
	93	l += n1;
	94	}
	95	}
45f133b9 AT	96	/* a -2 token means to send data only and no token */
	97	if (token != -2) {
	98	write_int(f,-(token+1));
	99	}
70d794dc AT	100	}
	101
	102
861c20b4 PM	103	/* Flag bytes in compressed stream are encoded as follows: */
	104	#define END_FLAG 0 /* that's all folks */
	105	#define TOKEN_LONG 0x20 /* followed by 32-bit token number */
	106	#define TOKENRUN_LONG 0x21 /* ditto with 16-bit run count */
	107	#define DEFLATED_DATA 0x40 /* + 6-bit high len, then low len byte */
	108	#define TOKEN_REL 0x80 /* + 6-bit relative token number */
	109	#define TOKENRUN_REL 0xc0 /* ditto with 16-bit run count */
	110
	111	#define MAX_DATA_COUNT 16383 /* fit 14 bit count into 2 bytes with flags */
	112
	113	/* For coding runs of tokens */
	114	static int last_token = -1;
	115	static int run_start;
	116	static int last_run_end;
	117
	118	/* Deflation state */
	119	static z_stream tx_strm;
	120
	121	/* Output buffer */
3a6a366f	122	static char *obuf;
861c20b4 PM	123
	124	/* Send a deflated token */
	125	static void
	126	send_deflated_token(int f, int token,
45f133b9	127	struct map_struct *buf, OFF_T offset, int nb, int toklen)
861c20b4	128	{
5914bf15 PM	129	int n, r;
	130	static int init_done, flush_pending;
	131
	132	if (last_token == -1) {
	133	/* initialization */
	134	if (!init_done) {
	135	tx_strm.next_in = NULL;
	136	tx_strm.zalloc = NULL;
	137	tx_strm.zfree = NULL;
83fff1aa	138	if (deflateInit2(&tx_strm, compression_level,
5914bf15 PM	139	Z_DEFLATED, -15, 8,
	140	Z_DEFAULT_STRATEGY) != Z_OK) {
	141	rprintf(FERROR, "compression init failed\n");
65417579	142	exit_cleanup(RERR_STREAMIO);
5914bf15 PM	143	}
	144	if ((obuf = malloc(MAX_DATA_COUNT+2)) == NULL)
	145	out_of_memory("send_deflated_token");
	146	init_done = 1;
	147	} else
	148	deflateReset(&tx_strm);
	149	last_run_end = 0;
	150	run_start = token;
	151	flush_pending = 0;
	152
	153	} else if (last_token == -2) {
	154	run_start = token;
	155
	156	} else if (nb != 0 \|\| token != last_token + 1
	157	\|\| token >= run_start + 65536) {
	158	/* output previous run */
	159	r = run_start - last_run_end;
	160	n = last_token - run_start;
	161	if (r >= 0 && r <= 63) {
	162	write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r);
	163	} else {
	164	write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG));
	165	write_int(f, run_start);
	166	}
	167	if (n != 0) {
	168	write_byte(f, n);
	169	write_byte(f, n >> 8);
	170	}
	171	last_run_end = last_token;
	172	run_start = token;
861c20b4	173	}
5914bf15 PM	174
	175	last_token = token;
	176
	177	if (nb != 0 \|\| flush_pending) {
	178	/* deflate the data starting at offset */
	179	int flush = Z_NO_FLUSH;
	180	tx_strm.avail_in = 0;
	181	tx_strm.avail_out = 0;
	182	do {
	183	if (tx_strm.avail_in == 0 && nb != 0) {
	184	/* give it some more input */
	185	n = MIN(nb, CHUNK_SIZE);
	186	tx_strm.next_in = (Bytef *)
	187	map_ptr(buf, offset, n);
	188	tx_strm.avail_in = n;
	189	nb -= n;
	190	offset += n;
	191	}
	192	if (tx_strm.avail_out == 0) {
	193	tx_strm.next_out = (Bytef *)(obuf + 2);
	194	tx_strm.avail_out = MAX_DATA_COUNT;
	195	if (flush != Z_NO_FLUSH) {
	196	/*
	197	* We left the last 4 bytes in the
	198	* buffer, in case they are the
	199	* last 4. Move them to the front.
	200	*/
	201	memcpy(tx_strm.next_out,
	202	obuf+MAX_DATA_COUNT-2, 4);
	203	tx_strm.next_out += 4;
	204	tx_strm.avail_out -= 4;
	205	}
	206	}
	207	if (nb == 0 && token != -2)
	208	flush = Z_SYNC_FLUSH;
	209	r = deflate(&tx_strm, flush);
	210	if (r != Z_OK) {
	211	rprintf(FERROR, "deflate returned %d\n", r);
65417579	212	exit_cleanup(RERR_STREAMIO);
5914bf15 PM	213	}
	214	if (nb == 0 \|\| tx_strm.avail_out == 0) {
	215	n = MAX_DATA_COUNT - tx_strm.avail_out;
	216	if (flush != Z_NO_FLUSH) {
	217	/*
	218	* We have to trim off the last 4
	219	* bytes of output when flushing
	220	* (they are just 0, 0, ff, ff).
	221	*/
	222	n -= 4;
	223	}
	224	if (n > 0) {
	225	obuf[0] = DEFLATED_DATA + (n >> 8);
	226	obuf[1] = n;
	227	write_buf(f, obuf, n+2);
	228	}
	229	}
	230	} while (nb != 0 \|\| tx_strm.avail_out == 0);
	231	flush_pending = token == -2;
861c20b4	232	}
861c20b4	233
5914bf15 PM	234	if (token == -1) {
	235	/* end of file - clean up */
	236	write_byte(f, END_FLAG);
861c20b4	237
5914bf15 PM	238	} else if (token != -2) {
	239	/* add the data in the current block to the compressor's
	240	history and hash table */
	241	tx_strm.next_in = (Bytef *) map_ptr(buf, offset, toklen);
	242	tx_strm.avail_in = toklen;
	243	tx_strm.next_out = (Bytef *) obuf;
861c20b4	244	tx_strm.avail_out = MAX_DATA_COUNT;
5914bf15 PM	245	r = deflate(&tx_strm, Z_INSERT_ONLY);
	246	if (r != Z_OK \|\| tx_strm.avail_in != 0) {
	247	rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n",
	248	r, tx_strm.avail_in);
65417579	249	exit_cleanup(RERR_STREAMIO);
861c20b4	250	}
861c20b4	251	}
861c20b4 PM	252	}
	253
	254
	255	/* tells us what the receiver is in the middle of doing */
	256	static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state;
70d794dc	257
861c20b4 PM	258	/* for inflating stuff */
	259	static z_stream rx_strm;
	260	static char *cbuf;
	261	static char *dbuf;
	262
	263	/* for decoding runs of tokens */
	264	static int rx_token;
	265	static int rx_run;
	266
	267	/* Receive a deflated token and inflate it */
	268	static int
	269	recv_deflated_token(int f, char **data)
	270	{
5914bf15 PM	271	int n, r, flag;
	272	static int init_done;
	273	static int saved_flag;
	274
	275	for (;;) {
	276	switch (recv_state) {
	277	case r_init:
	278	if (!init_done) {
	279	rx_strm.next_out = NULL;
	280	rx_strm.zalloc = NULL;
	281	rx_strm.zfree = NULL;
	282	if (inflateInit2(&rx_strm, -15) != Z_OK) {
	283	rprintf(FERROR, "inflate init failed\n");
65417579	284	exit_cleanup(RERR_STREAMIO);
5914bf15 PM	285	}
	286	if ((cbuf = malloc(MAX_DATA_COUNT)) == NULL
	287	\|\| (dbuf = malloc(CHUNK_SIZE)) == NULL)
	288	out_of_memory("recv_deflated_token");
	289	init_done = 1;
	290	} else {
	291	inflateReset(&rx_strm);
	292	}
b8d4524b	293	recv_state = r_idle;
5914bf15 PM	294	rx_token = 0;
	295	break;
	296
	297	case r_idle:
	298	case r_inflated:
	299	if (saved_flag) {
	300	flag = saved_flag & 0xff;
	301	saved_flag = 0;
	302	} else
	303	flag = read_byte(f);
	304	if ((flag & 0xC0) == DEFLATED_DATA) {
	305	n = ((flag & 0x3f) << 8) + read_byte(f);
	306	read_buf(f, cbuf, n);
	307	rx_strm.next_in = (Bytef *)cbuf;
	308	rx_strm.avail_in = n;
	309	recv_state = r_inflating;
	310	break;
	311	}
	312	if (recv_state == r_inflated) {
	313	/* check previous inflated stuff ended correctly */
	314	rx_strm.avail_in = 0;
	315	rx_strm.next_out = (Bytef *)dbuf;
	316	rx_strm.avail_out = CHUNK_SIZE;
	317	r = inflate(&rx_strm, Z_SYNC_FLUSH);
	318	n = CHUNK_SIZE - rx_strm.avail_out;
	319	/*
	320	* Z_BUF_ERROR just means no progress was
	321	* made, i.e. the decompressor didn't have
	322	* any pending output for us.
	323	*/
	324	if (r != Z_OK && r != Z_BUF_ERROR) {
	325	rprintf(FERROR, "inflate flush returned %d (%d bytes)\n",
	326	r, n);
65417579	327	exit_cleanup(RERR_STREAMIO);
5914bf15 PM	328	}
	329	if (n != 0 && r != Z_BUF_ERROR) {
	330	/* have to return some more data and
	331	save the flag for later. */
	332	saved_flag = flag + 0x10000;
	333	*data = dbuf;
	334	return n;
	335	}
	336	/*
	337	* At this point the decompressor should
	338	* be expecting to see the 0, 0, ff, ff bytes.
	339	*/
	340	if (!inflateSyncPoint(&rx_strm)) {
	341	rprintf(FERROR, "decompressor lost sync!\n");
65417579	342	exit_cleanup(RERR_STREAMIO);
5914bf15 PM	343	}
	344	rx_strm.avail_in = 4;
	345	rx_strm.next_in = (Bytef *)cbuf;
	346	cbuf[0] = cbuf[1] = 0;
	347	cbuf[2] = cbuf[3] = 0xff;
	348	inflate(&rx_strm, Z_SYNC_FLUSH);
	349	recv_state = r_idle;
	350	}
	351	if (flag == END_FLAG) {
	352	/* that's all folks */
	353	recv_state = r_init;
	354	return 0;
	355	}
	356
	357	/* here we have a token of some kind */
	358	if (flag & TOKEN_REL) {
	359	rx_token += flag & 0x3f;
	360	flag >>= 6;
	361	} else
	362	rx_token = read_int(f);
	363	if (flag & 1) {
	364	rx_run = read_byte(f);
	365	rx_run += read_byte(f) << 8;
	366	recv_state = r_running;
	367	}
	368	return -1 - rx_token;
	369
	370	case r_inflating:
	371	rx_strm.next_out = (Bytef *)dbuf;
	372	rx_strm.avail_out = CHUNK_SIZE;
	373	r = inflate(&rx_strm, Z_NO_FLUSH);
	374	n = CHUNK_SIZE - rx_strm.avail_out;
	375	if (r != Z_OK) {
	376	rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n);
65417579	377	exit_cleanup(RERR_STREAMIO);
5914bf15 PM	378	}
	379	if (rx_strm.avail_in == 0)
	380	recv_state = r_inflated;
	381	if (n != 0) {
	382	*data = dbuf;
	383	return n;
	384	}
	385	break;
	386
	387	case r_running:
	388	++rx_token;
	389	if (--rx_run == 0)
	390	recv_state = r_idle;
	391	return -1 - rx_token;
b8d4524b	392	}
861c20b4	393	}
861c20b4 PM	394	}
	395
	396	/*
	397	* put the data corresponding to a token that we've just returned
	398	* from recv_deflated_token into the decompressor's history buffer.
	399	*/
6e4fb64e	400	static void see_deflate_token(char *buf, int len)
861c20b4	401	{
5914bf15 PM	402	int r, blklen;
	403	unsigned char hdr[5];
	404
	405	rx_strm.avail_in = 0;
	406	blklen = 0;
	407	hdr[0] = 0;
	408	do {
	409	if (rx_strm.avail_in == 0 && len != 0) {
	410	if (blklen == 0) {
	411	/* Give it a fake stored-block header. */
	412	rx_strm.next_in = (Bytef *)hdr;
	413	rx_strm.avail_in = 5;
	414	blklen = len;
	415	if (blklen > 0xffff)
	416	blklen = 0xffff;
	417	hdr[1] = blklen;
	418	hdr[2] = blklen >> 8;
	419	hdr[3] = ~hdr[1];
	420	hdr[4] = ~hdr[2];
	421	} else {
	422	rx_strm.next_in = (Bytef *)buf;
	423	rx_strm.avail_in = blklen;
	424	len -= blklen;
	425	blklen = 0;
	426	}
	427	}
	428	rx_strm.next_out = (Bytef *)dbuf;
	429	rx_strm.avail_out = CHUNK_SIZE;
	430	r = inflate(&rx_strm, Z_SYNC_FLUSH);
	431	if (r != Z_OK) {
	432	rprintf(FERROR, "inflate (token) returned %d\n", r);
65417579	433	exit_cleanup(RERR_STREAMIO);
5914bf15 PM	434	}
5914bf15 PM	435	} while (len \|\| rx_strm.avail_out == 0);
861c20b4	436	}
70d794dc AT	437
	438	/*
	439	* transmit a verbatim buffer of length n followed by a token
	440	* If token == -1 then we have reached EOF
	441	* If n == 0 then don't send a buffer
70d794dc	442	*/
45f133b9	443	void send_token(int f,int token,struct map_struct *buf,OFF_T offset,
9e31c482	444	int n,int toklen)
70d794dc	445	{
5914bf15 PM	446	if (!do_compression) {
	447	simple_send_token(f,token,buf,offset,n);
	448	} else {
	449	send_deflated_token(f, token, buf, offset, n, toklen);
	450	}
70d794dc AT	451	}
	452
	453
	454	/*
	455	* receive a token or buffer from the other end. If the reurn value is >0 then
	456	* it is a data buffer of that length, and *data will point at the data.
	457	* if the return value is -i then it represents token i-1
	458	* if the return value is 0 then the end has been reached
	459	*/
	460	int recv_token(int f,char **data)
	461	{
5914bf15 PM	462	int tok;
	463
	464	if (!do_compression) {
	465	tok = simple_recv_token(f,data);
	466	} else {
	467	tok = recv_deflated_token(f, data);
	468	}
	469	return tok;
861c20b4 PM	470	}
	471
	472	/*
	473	* look at the data corresponding to a token, if necessary
	474	*/
	475	void see_token(char *data, int toklen)
	476	{
5914bf15 PM	477	if (do_compression)
5914bf15 PM	478	see_deflate_token(data, toklen);
70d794dc	479	}