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();
}
}
}
