- Use an int32 for each checksum length variable.

[rsync/rsync.git] / fileio.c

diff --git a/fileio.c b/fileio.c
index 44ec8ef..2b86a5e 100644 (file)
--- a/fileio.c
+++ b/fileio.c
@@ -24,8 +24,6 @@
 
 extern int sparse_files;
 
-unsigned int max_map_size = MAX_MAP_SIZE;
-
 static char last_byte;
 static int last_sparse;
 
@@ -129,7 +127,8 @@ int write_file(int f,char *buf,size_t len)
                        }
                }
                if (r1 <= 0) {
-                       if (ret > 0) return ret;
+                       if (ret > 0)
+                               return ret;
                        return r1;
                }
                len -= r1;
@@ -140,20 +139,25 @@ int write_file(int f,char *buf,size_t len)
 }
 
 
-/* this provides functionality somewhat similar to mmap() but using
-   read(). It gives sliding window access to a file. mmap() is not
-   used because of the possibility of another program (such as a
-   mailer) truncating the file thus giving us a SIGBUS */
-struct map_struct *map_file(int fd,OFF_T len)
+/* This provides functionality somewhat similar to mmap() but using read().
+ * It gives sliding window access to a file.  mmap() is not used because of
+ * the possibility of another program (such as a mailer) truncating the
+ * file thus giving us a SIGBUS. */
+struct map_struct *map_file(int fd, OFF_T len, OFF_T map_size,
+                           size_t block_size)
 {
        struct map_struct *map;
 
        if (!(map = new(struct map_struct)))
                out_of_memory("map_file");
 
+       if (block_size && (map_size % block_size))
+               map_size += block_size - (map_size % block_size);
+
        memset(map, 0, sizeof map[0]);
        map->fd = fd;
        map->file_size = len;
+       map->def_window_size = map_size;
 
        return map;
 }
@@ -166,9 +170,8 @@ char *map_ptr(struct map_struct *map,OFF_T offset,int len)
        OFF_T window_start, read_start;
        int window_size, read_size, read_offset;
 
-       if (len == 0) {
+       if (len == 0)
                return NULL;
-       }
 
        /* can't go beyond the end of file */
        if (len > (map->file_size - offset)) {
@@ -182,13 +185,8 @@ char *map_ptr(struct map_struct *map,OFF_T offset,int len)
        }
 
        /* nope, we are going to have to do a read. Work out our desired window */
-       if (offset > 2*CHUNK_SIZE) {
-               window_start = offset - 2*CHUNK_SIZE;
-               window_start &= ~((OFF_T)(CHUNK_SIZE-1)); /* assumes power of 2 */
-       } else {
-               window_start = 0;
-       }
-       window_size = max_map_size;
+       window_start = offset;
+       window_size = map->def_window_size;
        if (window_start + window_size > map->file_size) {
                window_size = map->file_size - window_start;
        }
@@ -199,7 +197,8 @@ char *map_ptr(struct map_struct *map,OFF_T offset,int len)
        /* make sure we have allocated enough memory for the window */
        if (window_size > map->p_size) {
                map->p = realloc_array(map->p, char, window_size);
-               if (!map->p) out_of_memory("map_ptr");
+               if (!map->p)
+                       out_of_memory("map_ptr");
                map->p_size = window_size;
        }