private static IDictionary <string, FileEntry> ReadLegacyEntries(IndexInput stream, int firstInt)
{
IDictionary <string, FileEntry> entries = new Dictionary <string, FileEntry>();
int count;
bool stripSegmentName;
if (firstInt < CompoundFileWriter.FORMAT_PRE_VERSION)
{
if (firstInt < CompoundFileWriter.FORMAT_NO_SEGMENT_PREFIX)
{
throw new CorruptIndexException("Incompatible format version: "
+ firstInt + " expected >= " + CompoundFileWriter.FORMAT_NO_SEGMENT_PREFIX + " (resource: " + stream + ")");
}
// It's a post-3.1 index, read the count.
count = stream.ReadVInt32();
stripSegmentName = false;
}
else
{
count = firstInt;
stripSegmentName = true;
}
// read the directory and init files
long streamLength = stream.Length;
FileEntry entry = null;
for (int i = 0; i < count; i++)
{
long offset = stream.ReadInt64();
if (offset < 0 || offset > streamLength)
{
throw new CorruptIndexException("Invalid CFS entry offset: " + offset + " (resource: " + stream + ")");
}
string id = stream.ReadString();
if (stripSegmentName)
{
// Fix the id to not include the segment names. this is relevant for
// pre-3.1 indexes.
id = IndexFileNames.StripSegmentName(id);
}
if (entry != null)
{
// set length of the previous entry
entry.Length = offset - entry.Offset;
}
entry = new FileEntry();
entry.Offset = offset;
FileEntry previous = entries.Put(id, entry);
if (previous != null)
{
throw new CorruptIndexException("Duplicate cfs entry id=" + id + " in CFS: " + stream);
}
}
// set the length of the final entry
if (entry != null)
{
entry.Length = streamLength - entry.Offset;
}
return(entries);
}
/// <summary>
/// Helper method that reads CFS entries from an input stream </summary>
private static IDictionary <string, FileEntry> ReadEntries(IndexInputSlicer handle, Directory dir, string name)
{
IOException priorE = null;
IndexInput stream = null;
ChecksumIndexInput entriesStream = null;
// read the first VInt. If it is negative, it's the version number
// otherwise it's the count (pre-3.1 indexes)
try
{
IDictionary <string, FileEntry> mapping;
#pragma warning disable 612, 618
stream = handle.OpenFullSlice();
#pragma warning restore 612, 618
int firstInt = stream.ReadVInt32();
// impossible for 3.0 to have 63 files in a .cfs, CFS writer was not visible
// and separate norms/etc are outside of cfs.
if (firstInt == CODEC_MAGIC_BYTE1)
{
sbyte secondByte = (sbyte)stream.ReadByte();
sbyte thirdByte = (sbyte)stream.ReadByte();
sbyte fourthByte = (sbyte)stream.ReadByte();
if (secondByte != CODEC_MAGIC_BYTE2 || thirdByte != CODEC_MAGIC_BYTE3 || fourthByte != CODEC_MAGIC_BYTE4)
{
throw new CorruptIndexException("Illegal/impossible header for CFS file: " + secondByte + "," + thirdByte + "," + fourthByte);
}
int version = CodecUtil.CheckHeaderNoMagic(stream, CompoundFileWriter.DATA_CODEC, CompoundFileWriter.VERSION_START, CompoundFileWriter.VERSION_CURRENT);
string entriesFileName = IndexFileNames.SegmentFileName(
IndexFileNames.StripExtension(name), "",
IndexFileNames.COMPOUND_FILE_ENTRIES_EXTENSION);
entriesStream = dir.OpenChecksumInput(entriesFileName, IOContext.READ_ONCE);
CodecUtil.CheckHeader(entriesStream, CompoundFileWriter.ENTRY_CODEC, CompoundFileWriter.VERSION_START, CompoundFileWriter.VERSION_CURRENT);
int numEntries = entriesStream.ReadVInt32();
mapping = new Dictionary <string, FileEntry>(numEntries);
for (int i = 0; i < numEntries; i++)
{
FileEntry fileEntry = new FileEntry();
string id = entriesStream.ReadString();
FileEntry previous = mapping.Put(id, fileEntry);
if (previous != null)
{
throw new CorruptIndexException("Duplicate cfs entry id=" + id + " in CFS: " + entriesStream);
}
fileEntry.Offset = entriesStream.ReadInt64();
fileEntry.Length = entriesStream.ReadInt64();
}
if (version >= CompoundFileWriter.VERSION_CHECKSUM)
{
CodecUtil.CheckFooter(entriesStream);
}
else
{
#pragma warning disable 612, 618
CodecUtil.CheckEOF(entriesStream);
#pragma warning restore 612, 618
}
}
else
{
// TODO remove once 3.x is not supported anymore
mapping = ReadLegacyEntries(stream, firstInt);
}
return(mapping);
}
catch (IOException ioe)
{
priorE = ioe;
}
finally
{
IOUtils.DisposeWhileHandlingException(priorE, stream, entriesStream);
}
// this is needed until Java 7's real try-with-resources:
throw new InvalidOperationException("impossible to get here");
}