X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/9e31c4824cabb1bf173f87cbd0abe93f25ea9598..a41a1e87182410ec6c2eeaddb0cd961ec554c404:/token.c

diff --git a/token.c b/token.c
index 887e6254..8ba32b99 100644
--- a/token.c
+++ b/token.c
@@ -1,87 +1,476 @@
-/* 
+/*
    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;
+extern int module_id;
+
+static int compression_level = Z_DEFAULT_COMPRESSION;
+
+/* determine the compression level based on a wildcard filename list */
+void set_compression(char *fname)
+{
+	char *dont;
+	char *tok;
 
+	if (!do_compression)
+		return;
+
+	compression_level = Z_DEFAULT_COMPRESSION;
+	dont = lp_dont_compress(module_id);
+
+	if (!dont || !*dont)
+		return;
+
+	if (dont[0] == '*' && !dont[1]) {
+		/* an optimization to skip the rest of this routine */
+		compression_level = 0;
+		return;
+	}
+
+	dont = strdup(dont);
+	fname = strdup(fname);
+	if (!dont || !fname)
+		return;
+
+	strlower(dont);
+	strlower(fname);
+
+	for (tok = strtok(dont, " "); tok; tok = strtok(NULL, " ")) {
+		if (wildmatch(tok, fname)) {
+			compression_level = 0;
+			break;
+		}
+	}
+	free(dont);
+	free(fname);
+}
 
 /* non-compressing recv token */
-static int simple_recv_token(int f,char **data)
+static int32 simple_recv_token(int f, char **data)
 {
-  static int residue = 0;
-  static char *buf = NULL;
-  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;
+	static int residue;
+	static char *buf;
+	int32 n;
+
+	if (!buf) {
+		buf = new_array(char, CHUNK_SIZE);
+		if (!buf)
+			out_of_memory("simple_recv_token");
+	}
+
+	if (residue == 0) {
+		int32 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,int offset,int n)
+static void simple_send_token(int f, int token, struct map_struct *buf,
+			      OFF_T offset, int32 n)
+{
+	if (n > 0) {
+		int32 len = 0;
+		while (len < n) {
+			int32 n1 = MIN(CHUNK_SIZE, n-len);
+			write_int(f, n1);
+			write_buf(f, map_ptr(buf, offset+len, n1), n1);
+			len += 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 */
+
+/* zlib.h says that if we want to be able to compress something in a single
+ * call, avail_out must be at least 0.1% larger than avail_in plus 12 bytes.
+ * We'll add in 0.1%+16, just to be safe (and we'll avoid floating point,
+ * to ensure that this is a compile-time value). */
+#define AVAIL_OUT_SIZE(avail_in_size) ((avail_in_size)*1001/1000+16)
+
+/* 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;
+
+/* We want obuf to be able to hold both MAX_DATA_COUNT+2 bytes as well as
+ * AVAIL_OUT_SIZE(CHUNK_SIZE) bytes, so make sure that it's large enough. */
+#if MAX_DATA_COUNT+2 > AVAIL_OUT_SIZE(CHUNK_SIZE)
+#define OBUF_SIZE	(MAX_DATA_COUNT+2)
+#else
+#define OBUF_SIZE	AVAIL_OUT_SIZE(CHUNK_SIZE)
+#endif
+
+/* Send a deflated token */
+static void
+send_deflated_token(int f, int token, struct map_struct *buf, OFF_T offset,
+		    int32 nb, int32 toklen)
 {
-  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;
-    }
-  }
-  write_int(f,-(token+1));
+	int32 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 = new_array(char, OBUF_SIZE)) == 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 = AVAIL_OUT_SIZE(CHUNK_SIZE);
+		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 int32 rx_token;
+static int32 rx_run;
+
+/* Receive a deflated token and inflate it */
+static int32 recv_deflated_token(int f, char **data)
+{
+	static int init_done;
+	static int saved_flag;
+	int r, flag;
+	int32 n;
+
+	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 = new_array(char, MAX_DATA_COUNT))
+				    || !(dbuf = new_array(char, AVAIL_OUT_SIZE(CHUNK_SIZE))))
+					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 = AVAIL_OUT_SIZE(CHUNK_SIZE);
+				r = inflate(&rx_strm, Z_SYNC_FLUSH);
+				n = AVAIL_OUT_SIZE(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 = AVAIL_OUT_SIZE(CHUNK_SIZE);
+			r = inflate(&rx_strm, Z_NO_FLUSH);
+			n = AVAIL_OUT_SIZE(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;
+		}
+	}
+}
 
 /*
- * 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
+ * put the data corresponding to a token that we've just returned
+ * from recv_deflated_token into the decompressor's history buffer.
  */
-void send_token(int f,int token,struct map_struct *buf,int offset,
-		int n,int toklen)
+static void see_deflate_token(char *buf, int32 len)
 {
-  if (!do_compression) {
-    simple_send_token(f,token,buf,offset,n);
-    return;
-  }
+	int r, blklen;
+	unsigned char hdr[5];
 
-  /* compressed transmit here */
+	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 = AVAIL_OUT_SIZE(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 @p 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,
+		int32 n, int32 toklen)
+{
+	if (!do_compression)
+		simple_send_token(f, token, buf, offset, n);
+	else
+		send_deflated_token(f, token, buf, offset, n, toklen);
 }
 
 
@@ -91,12 +480,23 @@ void send_token(int f,int token,struct map_struct *buf,int offset,
  * 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)
+int32 recv_token(int f, char **data)
 {
-  if (!do_compression) {
-    return simple_recv_token(f,data);
-  }
+	int tok;
+
+	if (!do_compression) {
+		tok = simple_recv_token(f,data);
+	} else {
+		tok = recv_deflated_token(f, data);
+	}
+	return tok;
+}
 
-  /* compressed receive here */
-  return 0;
+/*
+ * look at the data corresponding to a token, if necessary
+ */
+void see_token(char *data, int32 toklen)
+{
+	if (do_compression)
+		see_deflate_token(data, toklen);
 }