Windows: Add support for returning file IDs from stat and readdir
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* NtQueryDirectoryFile is more efficient than FindFindFile/FindNextFile * Include a minimal copy of "ntifs.h" containing the definitions required to call NtQueryDirectoryFile and RtlNtStatusToDosError. * Use a new set of JNI entry point to maximize performance. Instead of c++ code calling back into Java, we use a DirectByteBuffer to share native memory between C++ and Java, making the JNI interface less chatty and more efficient. This is about 20% faster than using Java callbacks. * This is available on Windows Vista/Windows Server 2008 and later. * Add entry point to check if new API is supported
* Add `FileInfo.getKey()` that returns a file identifier than can be used to compare efficiently files for equality. If the key is not available, the method returns `null`. * This is a similar concept as exposed in the Java 7 nio API https://docs.oracle.com/javase/7/docs/api/java/nio/file/attribute/BasicFileAttributes.html#fileKey() * A WindowsFileKey is a pair of (volume serial number, file id on the volume) * Update the `stat` and `fastReaddirXxx` jni entry points to provide this information * Update the test app to display `file key` if it is available
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Also updated tests, since all platforms now include support for file keys
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FileInfo.getKey()that returns a file identifier than can be used to compareefficiently files for equality. If the key is not available, the method returns
null.https://docs.oracle.com/javase/7/docs/api/java/nio/file/attribute/BasicFileAttributes.html#fileKey()
statandfastReaddirXxxjni entry points to provide this informationfile keyif it is available