Changeset 8913 in vbox for trunk/src

Timestamp:

May 19, 2008 11:34:46 AM (17 years ago)

Author:

vboxsync

Message:

made RTFileGetMaxSizeEx() OS-specific

Location:

trunk/src/VBox/Runtime/r3

Files:

• fileio.cpp (modified) (1 diff)
• posix/fileio-posix.cpp (modified) (1 diff)
• win/fileio-win.cpp (modified) (1 diff)

trunk/src/VBox/Runtime/r3/fileio.cpp

@@ -239 +239 @@
     int rc = RTFileGetMaxSizeEx(File, &cbMax);
     return RT_SUCCESS(rc) ? cbMax : -1;
-}
-
-
-/**
- * Determine the maximum file size.
- *
- * @returns IPRT status code.
- * @param   File        Handle to the file.
- * @param   pcbMax      Where to store the max file size.
- * @see     RTFileGetMaxSize.
- */
-RTR3DECL(int) RTFileGetMaxSizeEx(RTFILE File, PRTFOFF pcbMax)
-{
-    /*
-     * Save the current location
-     */
-    uint64_t offOld;
-    int rc = RTFileSeek(File, 0, RTFILE_SEEK_CURRENT, &offOld);
-    if (RT_FAILURE(rc))
-        return rc;
-
-    /*
-     * Perform a binary search for the max file size.
-     */
-    uint64_t offLow  =       0;
-    uint64_t offHigh = 8 * _1T; /* we don't need bigger files */
-    /** @todo r=bird: This isn't doing the trick for windows (at least not vista).
-     * Close to offHigh is returned regardless of NTFS or FAT32.
-     * We might have to make this code OS specific...
-     * In the worse case, we'll have to try GetVolumeInformationByHandle on vista and fall
-     * back on NtQueryVolumeInformationFile(,,,, FileFsAttributeInformation) else where, and
-     * check for known file system names. (For LAN shares we'll have to figure out the remote
-     * file system.) */
-    //uint64_t offHigh = INT64_MAX;
-    for (;;)
-    {
-        uint64_t cbInterval = (offHigh - offLow) >> 1;
-        if (cbInterval == 0)
-        {
-            if (pcbMax)
-                *pcbMax = offLow;
-            return RTFileSeek(File, offOld, RTFILE_SEEK_BEGIN, NULL);
-        }
-
-        rc = RTFileSeek(File, offLow + cbInterval, RTFILE_SEEK_BEGIN, NULL);
-        if (RT_FAILURE(rc))
-            offHigh = offLow + cbInterval;
-        else
-            offLow  = offLow + cbInterval;
-    }
 }
 

trunk/src/VBox/Runtime/r3/posix/fileio-posix.cpp

@@ -393 +393 @@
 
 
+/**
+ * Determine the maximum file size.
+ *
+ * @returns IPRT status code.
+ * @param   File        Handle to the file.
+ * @param   pcbMax      Where to store the max file size.
+ * @see     RTFileGetMaxSize.
+ */
+RTR3DECL(int) RTFileGetMaxSizeEx(RTFILE File, PRTFOFF pcbMax)
+{
+    /*
+     * Save the current location
+     */
+    uint64_t offOld;
+    int rc = RTFileSeek(File, 0, RTFILE_SEEK_CURRENT, &offOld);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    /*
+     * Perform a binary search for the max file size.
+     */
+    uint64_t offLow  =       0;
+    uint64_t offHigh = 8 * _1T; /* we don't need bigger files */
+    /** @todo Unfortunately this does not work for certain file system types,
+     * for instance cifs mounts. Even worse, statvfs.f_fsid returns 0 for such
+     * file systems. */
+    //uint64_t offHigh = INT64_MAX;
+    for (;;)
+    {
+        uint64_t cbInterval = (offHigh - offLow) >> 1;
+        if (cbInterval == 0)
+        {
+            if (pcbMax)
+                *pcbMax = offLow;
+            return RTFileSeek(File, offOld, RTFILE_SEEK_BEGIN, NULL);
+        }
+
+        rc = RTFileSeek(File, offLow + cbInterval, RTFILE_SEEK_BEGIN, NULL);
+        if (RT_FAILURE(rc))
+            offHigh = offLow + cbInterval;
+        else
+            offLow  = offLow + cbInterval;
+    }
+}
+
+
 RTR3DECL(bool) RTFileIsValid(RTFILE File)
 {

trunk/src/VBox/Runtime/r3/win/fileio-win.cpp

@@ -496 +496 @@
 
 
+RTR3DECL(int) RTFileGetMaxSizeEx(RTFILE File, PRTFOFF pcbMax)
+{
+    /** @todo r=bird:
+     * We might have to make this code OS specific...
+     * In the worse case, we'll have to try GetVolumeInformationByHandle on vista and fall
+     * back on NtQueryVolumeInformationFile(,,,, FileFsAttributeInformation) else where, and
+     * check for known file system names. (For LAN shares we'll have to figure out the remote
+     * file system.) */
+    return VERR_NOT_IMPLEMENTED;
+}
+
+
 RTR3DECL(bool) RTFileIsValid(RTFILE File)
 {