public static bool GetNextLogArchiveExtentSingle( SafeArchiveContext pvArchiveContext, ref CLFS_ARCHIVE_DESCRIPTOR rgadExtent, out int pcDescriptorsReturned) { if (!_GetNextLogArchiveExtent(pvArchiveContext, ref rgadExtent, 1, out pcDescriptorsReturned)) { uint errorCode = (uint)Marshal.GetLastWin32Error(); switch (errorCode) { case Error.ERROR_NO_MORE_ITEMS: return false; case Error.ERROR_LOG_READ_CONTEXT_INVALID: case Error.ERROR_INVALID_PARAMETER: case Error.ERROR_INVALID_STATE: throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ExceptionForKnownCode(errorCode)); default: throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ExceptionForUnknownCode(errorCode)); } } return true; }
extern static bool _GetNextLogArchiveExtent( SafeArchiveContext pvArchiveContext, ref CLFS_ARCHIVE_DESCRIPTOR rgadExtent, int cDescriptors, // Must be 1 out int pcDescriptorsReturned);
internal LogArchiveSnapshot(LogStore store, ulong lsnLow, ulong lsnHigh) { StringBuilder baseLogFileName = new StringBuilder(MaxFileNameLength); int actualLength; ulong baseLogFileOffset; ulong baseLogFileLength; ulong lsnBase; ulong lsnLast; ulong lsnArchiveTail; SafeArchiveContext archiveContext = null; try { while (!UnsafeNativeMethods.PrepareLogArchive( store.Handle, baseLogFileName, baseLogFileName.Capacity, ref lsnLow, ref lsnHigh, out actualLength, out baseLogFileOffset, out baseLogFileLength, out lsnBase, out lsnLast, out lsnArchiveTail, out archiveContext)) { baseLogFileName.EnsureCapacity(actualLength + 1); } this.archiveTail = new SequenceNumber(lsnArchiveTail); this.baseSequenceNumber = new SequenceNumber(lsnBase); this.lastSequenceNumber = new SequenceNumber(lsnLast); List<FileRegion> regions = new List<FileRegion>(); byte[] readBuffer = new byte[checked((uint)baseLogFileLength)]; uint actualDataLength = 0; unsafe { fixed (byte* pbReadBuffer = readBuffer) { UnsafeNativeMethods.ReadLogArchiveMetadata( archiveContext, 0, readBuffer.Length, pbReadBuffer, out actualDataLength); } } byte[] baseFileData; if (actualDataLength == (uint)baseLogFileLength) { baseFileData = readBuffer; } else { baseFileData = new byte[actualDataLength]; Array.Copy(readBuffer, baseFileData, baseFileData.Length); } regions.Add(new FileRegion((long)baseLogFileLength, baseLogFileName.ToString(), (long)baseLogFileOffset, baseFileData)); CLFS_ARCHIVE_DESCRIPTOR descriptor = new CLFS_ARCHIVE_DESCRIPTOR(); while (true) { int returnedCount; if (!UnsafeNativeMethods.GetNextLogArchiveExtentSingle( archiveContext, ref descriptor, out returnedCount)) { break; } if (returnedCount < 1) break; long start = checked((long)descriptor.coffLow); long length = checked((long)(descriptor.coffHigh - descriptor.coffLow)); string fileName = descriptor.infoContainer.GetActualFileName(store.Handle); FileInfo containerInfo; containerInfo = new FileInfo(fileName); regions.Add(new FileRegion(containerInfo.Length, fileName, start, length)); } this.regions = regions.AsReadOnly(); } finally { if (archiveContext != null && !archiveContext.IsInvalid) { archiveContext.Close(); } } }