public static void CheckFooter(ChecksumIndexInput input)
{
var scratch = new BytesRef();
var expectedChecksum = string.Format(CultureInfo.InvariantCulture, "{0:D20}", input.Checksum);
ReadLine(input, scratch);
if (StringHelper.StartsWith(scratch, CHECKSUM) == false)
{
throw new CorruptIndexException("SimpleText failure: expected checksum line but got " +
scratch.Utf8ToString() + " (resource=" + input + ")");
}
var actualChecksum =
(new BytesRef(scratch.Bytes, CHECKSUM.Length, scratch.Length - CHECKSUM.Length)).Utf8ToString();
if (!expectedChecksum.Equals(actualChecksum))
{
throw new CorruptIndexException("SimpleText checksum failure: " + actualChecksum + " != " +
expectedChecksum + " (resource=" + input + ")");
}
if (input.Length() != input.FilePointer)
{
throw new CorruptIndexException(
"Unexpected stuff at the end of file, please be careful with your text editor! (resource=" + input +
")");
}
}
/// <summary>
/// Check integrity of the data. The iterator is not usable after this method has been called.
/// </summary>
internal void CheckIntegrity()
{
if (OuterInstance.Version_Renamed >= CompressingStoredFieldsWriter.VERSION_CHECKSUM)
{
FieldsStream.Seek(FieldsStream.Length() - CodecUtil.FooterLength());
CodecUtil.CheckFooter(FieldsStream);
}
}
/// <summary>
/// Validates the codec footer previously written by <seealso cref="#writeFooter"/>. </summary>
/// <returns> actual checksum value </returns>
/// <exception cref="IOException"> if the footer is invalid, if the checksum does not match,
/// or if {@code in} is not properly positioned before the footer
/// at the end of the stream. </exception>
public static long CheckFooter(ChecksumIndexInput @in)
{
ValidateFooter(@in);
long actualChecksum = @in.Checksum;
long expectedChecksum = @in.ReadLong();
if (expectedChecksum != actualChecksum)
{
throw new System.IO.IOException("checksum failed (hardware problem?) : expected=" + expectedChecksum.ToString("x") + " actual=" + actualChecksum.ToString("x") + " (resource=" + @in + ")");
}
if (@in.FilePointer != @in.Length())
{
throw new System.IO.IOException("did not read all bytes from file: read " + @in.FilePointer + " vs size " + @in.Length() + " (resource: " + @in + ")");
}
return(actualChecksum);
}
/// <summary> Read a particular segmentFileName. Note that this may
/// throw an IOException if a commit is in process.
///
/// </summary>
/// <param name="directory">-- directory containing the segments file
/// </param>
/// <param name="segmentFileName">-- segment file to load
/// </param>
/// <throws> CorruptIndexException if the index is corrupt </throws>
/// <throws> IOException if there is a low-level IO error </throws>
public void Read(Directory directory, System.String segmentFileName)
{
bool success = false;
// Clear any previous segments:
Clear();
var input = new ChecksumIndexInput(directory.OpenInput(segmentFileName));
generation = GenerationFromSegmentsFileName(segmentFileName);
lastGeneration = generation;
try
{
int format = input.ReadInt();
if (format < 0)
{
// file contains explicit format info
// check that it is a format we can understand
if (format < CURRENT_FORMAT)
{
throw new CorruptIndexException("Unknown format version: " + format);
}
version = input.ReadLong(); // read version
counter = input.ReadInt(); // read counter
}
else
{
// file is in old format without explicit format info
counter = format;
}
for (int i = input.ReadInt(); i > 0; i--)
{
// read segmentInfos
Add(new SegmentInfo(directory, format, input));
}
if (format >= 0)
{
// in old format the version number may be at the end of the file
if (input.FilePointer >= input.Length())
{
version = (DateTime.UtcNow.Ticks / TimeSpan.TicksPerMillisecond);
}
// old file format without version number
else
{
version = input.ReadLong(); // read version
}
}
if (format <= FORMAT_USER_DATA)
{
if (format <= FORMAT_DIAGNOSTICS)
{
userData = input.ReadStringStringMap();
}
else if (0 != input.ReadByte())
{
// TODO: Should be read-only map
userData = new HashMap <string, string> {
{ "userData", input.ReadString() }
};
}
else
{
// TODO: Should be empty read-only map
userData = new HashMap <string, string>();
}
}
else
{
// TODO: Should be empty read-only map
userData = new HashMap <string, string>();
}
if (format <= FORMAT_CHECKSUM)
{
long checksumNow = input.Checksum;
long checksumThen = input.ReadLong();
if (checksumNow != checksumThen)
{
throw new CorruptIndexException("checksum mismatch in segments file");
}
}
success = true;
}
finally
{
input.Close();
if (!success)
{
// Clear any segment infos we had loaded so we
// have a clean slate on retry:
Clear();
}
}
}
