X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/bd9fca47087cef1fc2d63f6f198d0d30da9ce6a4..82471e68a8bb3da8ca95f2b6564c330c52ce891e:/io.c

diff --git a/io.c b/io.c
index 1cfcd722..e2dc152a 100644
--- a/io.c
+++ b/io.c
@@ -48,6 +48,7 @@ extern int am_daemon;
 extern int am_sender;
 extern int am_generator;
 extern int eol_nulls;
+extern int csum_length;
 extern int checksum_seed;
 extern int protocol_version;
 extern char *remote_filesfrom_file;
@@ -779,6 +780,47 @@ unsigned char read_byte(int f)
 	return c;
 }
 
+/* Populate a sum_struct with values from the socket.  This is
+ * called by both the sender and the receiver. */
+void read_sum_head(int f, struct sum_struct *sum)
+{
+	sum->count = read_int(f);
+	sum->blength = read_int(f);
+	if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) {
+		rprintf(FERROR, "Invalid block length %ld\n",
+		    (long)sum->blength);
+		exit_cleanup(RERR_PROTOCOL);
+	}
+	sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f);
+	if (sum->s2length < 0 || sum->s2length > MD4_SUM_LENGTH) {
+		rprintf(FERROR, "Invalid checksum length %d\n", sum->s2length);
+		exit_cleanup(RERR_PROTOCOL);
+	}
+	sum->remainder = read_int(f);
+	if (sum->remainder < 0 || sum->remainder > sum->blength) {
+		rprintf(FERROR, "Invalid remainder length %ld\n",
+		    (long)sum->remainder);
+		exit_cleanup(RERR_PROTOCOL);
+	}
+}
+
+/* Send the values from a sum_struct over the socket.  Set sum to
+ * NULL if there are no checksums to send.  This is called by both
+ * the generator and the sender. */
+void write_sum_head(int f, struct sum_struct *sum)
+{
+	static struct sum_struct null_sum;
+
+	if (sum == NULL)
+		sum = &null_sum;
+
+	write_int(f, sum->count);
+	write_int(f, sum->blength);
+	if (protocol_version >= 27)
+		write_int(f, sum->s2length);
+	write_int(f, sum->remainder);
+}
+
 
 /**
  * Sleep after writing to limit I/O bandwidth usage.