/// <summary>
/// Validates the codec footer previously written by <see cref="WriteFooter(IndexOutput)"/>. </summary>
/// <returns> Actual checksum value. </returns>
/// <exception cref="IOException"> If the footer is invalid, if the checksum does not match,
/// or if <paramref name="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.ReadInt64();
if (expectedChecksum != actualChecksum)
{
throw new IOException("checksum failed (hardware problem?) : expected=" + expectedChecksum.ToString("x") + " actual=" + actualChecksum.ToString("x") + " (resource=" + @in + ")");
}
if (@in.GetFilePointer() != @in.Length)
{
throw new IOException("did not read all bytes from file: read " + @in.GetFilePointer() + " vs size " + @in.Length + " (resource: " + @in + ")");
}
return(actualChecksum);
}
public override FieldInfos Read(Directory directory, string segmentName, string segmentSuffix, IOContext context)
{
string fileName = IndexFileNames.SegmentFileName(segmentName, segmentSuffix, Lucene46FieldInfosFormat.EXTENSION);
ChecksumIndexInput input = directory.OpenChecksumInput(fileName, context);
bool success = false;
try
{
int codecVersion = CodecUtil.CheckHeader(input, Lucene46FieldInfosFormat.CODEC_NAME, Lucene46FieldInfosFormat.FORMAT_START, Lucene46FieldInfosFormat.FORMAT_CURRENT);
int size = input.ReadVInt32(); //read in the size
FieldInfo[] infos = new FieldInfo[size];
for (int i = 0; i < size; i++)
{
string name = input.ReadString();
int fieldNumber = input.ReadVInt32();
byte bits = input.ReadByte();
bool isIndexed = (bits & Lucene46FieldInfosFormat.IS_INDEXED) != 0;
bool storeTermVector = (bits & Lucene46FieldInfosFormat.STORE_TERMVECTOR) != 0;
bool omitNorms = (bits & Lucene46FieldInfosFormat.OMIT_NORMS) != 0;
bool storePayloads = (bits & Lucene46FieldInfosFormat.STORE_PAYLOADS) != 0;
IndexOptions indexOptions;
if (!isIndexed)
{
indexOptions = IndexOptions.NONE;
}
else if ((bits & Lucene46FieldInfosFormat.OMIT_TERM_FREQ_AND_POSITIONS) != 0)
{
indexOptions = IndexOptions.DOCS_ONLY;
}
else if ((bits & Lucene46FieldInfosFormat.OMIT_POSITIONS) != 0)
{
indexOptions = IndexOptions.DOCS_AND_FREQS;
}
else if ((bits & Lucene46FieldInfosFormat.STORE_OFFSETS_IN_POSTINGS) != 0)
{
indexOptions = IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS;
}
else
{
indexOptions = IndexOptions.DOCS_AND_FREQS_AND_POSITIONS;
}
// DV Types are packed in one byte
byte val = input.ReadByte();
DocValuesType docValuesType = GetDocValuesType(input, (byte)(val & 0x0F));
DocValuesType normsType = GetDocValuesType(input, (byte)((val.TripleShift(4)) & 0x0F));
long dvGen = input.ReadInt64();
IDictionary <string, string> attributes = input.ReadStringStringMap();
infos[i] = new FieldInfo(name, isIndexed, fieldNumber, storeTermVector, omitNorms, storePayloads, indexOptions, docValuesType, normsType, attributes.AsReadOnly());
infos[i].DocValuesGen = dvGen;
}
if (codecVersion >= Lucene46FieldInfosFormat.FORMAT_CHECKSUM)
{
CodecUtil.CheckFooter(input);
}
else
{
#pragma warning disable 612, 618
CodecUtil.CheckEOF(input);
#pragma warning restore 612, 618
}
FieldInfos fieldInfos = new FieldInfos(infos);
success = true;
return(fieldInfos);
}
finally
{
if (success)
{
input.Dispose();
}
else
{
IOUtils.DisposeWhileHandlingException(input);
}
}
}