Changeset 44241 in vbox for trunk/include/iprt

Timestamp:

Jan 7, 2013 8:17:19 PM (12 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

83097

Message:

Runtime/sg.cpp: Add API to check a buffer for zeros

Location:

trunk/include/iprt

Files:

• mangling.h (modified) (1 diff)
• sg.h (modified) (1 diff)

trunk/include/iprt/mangling.h

@@ -1173 +1173 @@
 # define RTSgBufCopyToBuf                               RT_MANGLER(RTSgBufCopyToBuf)
 # define RTSgBufInit                                    RT_MANGLER(RTSgBufInit)
+# define RTSgBufIsZero                                  RT_MANGLER(RTSgBufIsZero)
 # define RTSgBufReset                                   RT_MANGLER(RTSgBufReset)
 # define RTSgBufSegArrayCreate                          RT_MANGLER(RTSgBufSegArrayCreate)

trunk/include/iprt/sg.h

@@ -220 +220 @@
  */
 RTDECL(size_t) RTSgBufSegArrayCreate(PRTSGBUF pSgBuf, PRTSGSEG paSeg, unsigned *pcSeg, size_t cbData);
+
+/**
+ * Returns whether the given S/G buffer is zeroed out from the current position
+ * upto the number of bytes to check.
+ *
+ * @returns true if the buffer has only zeros
+ *          false otherwise.
+ * @param   pSgBuf      The S/G buffer.
+ * @param   cbCheck     Number of bytes to check.
+ */
+RTDECL(bool) RTSgBufIsZero(PRTSGBUF pSgBuf, size_t cbCheck);
 
 /**