Windows needs a special mark to create a sparse file.

SVN-Revision: 1857

diff --git a/libarchive/archive_write_disk.c b/libarchive/archive_write_disk.c
index f61ae1759252a881cedb2252bfbcf0e8ac4dbec1..053080d653a2725e73bbb336f56f8a442e93412f 100644 (file)
--- a/libarchive/archive_write_disk.c
+++ b/libarchive/archive_write_disk.c
@@ -95,6 +95,9 @@ __FBSDID("$FreeBSD: head/lib/libarchive/archive_write_disk.c 201159 2009-12-29 0
 #ifdef HAVE_UTIME_H
 #include <utime.h>
 #endif
+#ifdef HAVE_WINIOCTL_H
+#include <winioctl.h>
+#endif
 
 #include "archive.h"
 #include "archive_string.h"
@@ -513,6 +516,33 @@ _archive_write_header(struct archive *_a, struct archive_entry *entry)
                /* TODO: Complete this.. defer fflags from below. */
        }
 
+#if defined(_WIN32) && !defined(__CYGWIN__)
+       /*
+        * On Windows, A creating sparse file requires a special mark.
+        */
+       if (a->fd >= 0 && archive_entry_sparse_count(entry) > 0) {
+               int64_t base = 0, offset, length;
+               int i, cnt = archive_entry_sparse_reset(entry);
+               int sparse = 0;
+
+               for (i = 0; i < cnt; i++) {
+                       archive_entry_sparse_next(entry, &offset, &length);
+                       if (offset - base >= 4096) {
+                               sparse = 1;/* we have a hole. */
+                               break;
+                       }
+                       base = offset + length;
+               }
+               if (sparse) {
+                       HANDLE h = (HANDLE)_get_osfhandle(a->fd);
+                       DWORD dmy;
+                       /* Mark this file as sparse. */
+                       DeviceIoControl(h, FSCTL_SET_SPARSE,
+                           NULL, 0, NULL, 0, &dmy, NULL);
+               }
+       }
+#endif
+
        /* We've created the object and are ready to pour data into it. */
        if (ret >= ARCHIVE_WARN)
                a->archive.state = ARCHIVE_STATE_DATA;