// clear the ChunkValue
public void Clear()
{
m_fIsValid = false;
m_chunk = default;
m_propVariant.Clear();
m_pszValue = null;
}
/// <summary>
/// GetChunk
/// </summary>
/// <returns>the next chunk</returns>
public STAT_CHUNK GetChunk()
{
// Get the managed chunk
ManagedChunk managedChunk = _implementation.GetChunk();
if (managedChunk == null)
{
// End of chunks.
if (ThrowOnEndOfChunks)
{
// Throw exception.
throw new COMException(SR.Get(SRID.FilterEndOfChunks),
(int)FilterErrorCode.FILTER_E_END_OF_CHUNKS);
}
// Return STAT_CHUNK with idChunk as 0.
STAT_CHUNK chunk = new STAT_CHUNK();
chunk.idChunk = 0;
return(chunk);
}
// Valid chunk. Return corresponding STAT_CHUNK.
return(MarshalChunk(managedChunk));
}
internal static STAT_CHUNK MarshalChunk(ManagedChunk chunk)
{
STAT_CHUNK result = default(STAT_CHUNK);
result.idChunk = chunk.ID;
Invariant.Assert(chunk.BreakType >= CHUNK_BREAKTYPE.CHUNK_NO_BREAK && chunk.BreakType <= CHUNK_BREAKTYPE.CHUNK_EOC);
result.breakType = chunk.BreakType;
Invariant.Assert(chunk.Flags >= (CHUNKSTATE)0 && chunk.Flags <= (CHUNKSTATE.CHUNK_TEXT | CHUNKSTATE.CHUNK_VALUE | CHUNKSTATE.CHUNK_FILTER_OWNED_VALUE));
result.flags = chunk.Flags;
result.locale = chunk.Locale;
result.idChunkSource = chunk.ChunkSource;
result.cwcStartSource = chunk.StartSource;
result.cwcLenSource = chunk.LenSource;
IndexingFilterMarshaler.MarshalFullPropSpec(chunk.Attribute, ref result.attribute);
return(result);
}
private static void ReadChunk(IFilter filter, STAT_CHUNK chunk, StringBuilder text)
{
var textResult = IFilterReturnCodes.S_OK;
while (textResult == IFilterReturnCodes.S_OK)
{
var bufferSize = 4096U;
var buffer = new char[bufferSize];
textResult = filter.GetText(ref bufferSize, buffer);
if ((textResult == IFilterReturnCodes.S_OK || textResult == IFilterReturnCodes.FILTER_S_LAST_TEXT) && bufferSize > 0)
{
if (chunk.breakType == CHUNK_BREAKTYPE.CHUNK_EOP)
{
text.Append('\n');
}
text.Append(buffer, 0, (int)bufferSize);
}
}
}
/// <summary>
/// GetChunk
/// </summary>
/// <returns>An interop STAT_CHUNK from a ManagedChunk</returns>
internal static STAT_CHUNK MarshalChunk(ManagedChunk chunk)
{
STAT_CHUNK native = new STAT_CHUNK();
native.idChunk = chunk.ID;
Invariant.Assert(chunk.BreakType >= CHUNK_BREAKTYPE.CHUNK_NO_BREAK && chunk.BreakType <= CHUNK_BREAKTYPE.CHUNK_EOC);
native.breakType = chunk.BreakType;
Invariant.Assert(
chunk.Flags >= 0
&&
chunk.Flags <= (CHUNKSTATE.CHUNK_TEXT | CHUNKSTATE.CHUNK_VALUE | CHUNKSTATE.CHUNK_FILTER_OWNED_VALUE));
native.flags = chunk.Flags;
native.locale = chunk.Locale;
native.idChunkSource = chunk.ChunkSource;
native.cwcStartSource = chunk.StartSource;
native.cwcLenSource = chunk.LenSource;
MarshalFullPropSpec(chunk.Attribute, ref native.attribute);
return(native);
}
// Token: 0x06006CB6 RID: 27830 RVA: 0x001F4644 File Offset: 0x001F2844
public STAT_CHUNK GetChunk()
{
if (this._progress == PackageFilter.Progress.FilteringNotStarted)
{
this.MoveToNextFilter();
}
if (this._progress == PackageFilter.Progress.FilteringCompleted)
{
throw new COMException(SR.Get("FilterEndOfChunks"), -2147215616);
}
do
{
try
{
STAT_CHUNK chunk = this._currentFilter.GetChunk();
if ((!this._isInternalFilter || chunk.idChunk != 0U) && (this._progress == PackageFilter.Progress.FilteringCoreProperties || (chunk.flags & CHUNKSTATE.CHUNK_VALUE) != CHUNKSTATE.CHUNK_VALUE))
{
chunk.idChunk = this.AllocateChunkID();
chunk.idChunkSource = chunk.idChunk;
if (this._firstChunkFromFilter)
{
chunk.breakType = CHUNK_BREAKTYPE.CHUNK_EOP;
this._firstChunkFromFilter = false;
}
return(chunk);
}
}
catch (COMException)
{
}
catch (IOException ex)
{
if (this._isInternalFilter)
{
throw ex;
}
}
this.MoveToNextFilter();
}while (this._progress != PackageFilter.Progress.FilteringCompleted);
throw new COMException(SR.Get("FilterEndOfChunks"), -2147215616);
}
/// <summary>
/// Returns description of the next chunk.
/// </summary>
/// <returns>
/// Chunk descriptor.
/// </returns>
/// <remarks>
/// <para>
/// On end of stream, this function will throw an exception so as to return FILTER_E_END_OF_CHUNKS
/// to client code, in keeping with the IFilter specifications.
/// </para>
/// <para>
/// Non-fatal exceptions from external filters, identified for all practical purposes
/// with COMException and IOException, are `swallowed by this method.
/// </para>
/// </remarks>
public STAT_CHUNK GetChunk()
{
//
// _progress is Progress.FilteringNotStarted initially and
// subsequently gets updated in MoveToNextFilter().
//
if (_progress == Progress.FilteringNotStarted)
{
MoveToNextFilter();
}
if (_progress == Progress.FilteringCompleted)
{
throw new COMException(SR.Get(SRID.FilterEndOfChunks),
(int)FilterErrorCode.FILTER_E_END_OF_CHUNKS);
}
while (true)
{
try
{
STAT_CHUNK chunk = _currentFilter.GetChunk();
//
// No exception raised.
// If _currentFilter is internal filter,
// this might be end of chunks if chunk.idChunk is 0.
//
if (!_isInternalFilter || chunk.idChunk != 0)
{
//
// There are more chunks.
//
//
// Consider value chunks only when filtering core properties.
// Else, ignore the chunk and move to the next.
//
if (_progress == Progress.FilteringCoreProperties ||
(chunk.flags & CHUNKSTATE.CHUNK_VALUE) != CHUNKSTATE.CHUNK_VALUE)
{
//
// Found the next chunk to return.
//
// Replace ID from auxiliary filter by unique ID across the package.
chunk.idChunk = AllocateChunkID();
// Since pseudo-properties (a.k.a. internal values) are not supported,
// all chunks we return are expected to have idChunkSource equal to idChunk.
// (See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/indexsrv/html/ixufilt_8ib8.asp)
chunk.idChunkSource = chunk.idChunk;
// Some filters (such as the plain text filter)
// will return "no break" before the first chunk.
// However, the correct break type at the beginning
// of a part is "end of paragraph".
if (_firstChunkFromFilter)
{
chunk.breakType = CHUNK_BREAKTYPE.CHUNK_EOP;
// This flag gets set in MoveToNextFilter.
_firstChunkFromFilter = false;
}
return(chunk);
}
}
}
// Ignore IO and COM exceptions raised by an external filter.
catch (COMException)
{
// Most of the time, this will be a FILTER_E_END_OF_CHUNKS exception.
// In general, we don't really care: when an external filter gets in trouble
// we simply move to the next filter.
}
catch (IOException)
{
// Internal filters do not throw expected exceptions; so something bad
// must have happened. Let the client code get the exception and possibly
// choose to ignore it.
if (_isInternalFilter)
{
throw;
}
}
//
// Either there was FILTER_E_END_OF_CHUNKS exception
// from _currentFilter.GetChunk(),
// or _isInternalFilter is true and the returned chunk has
// idChunk as 0, which also indicates end of chunks.
//
// Move to the next filter.
//
MoveToNextFilter();
if (_progress == Progress.FilteringCompleted)
{
//
// No more filters. Filtering completed.
// Throw FILTER_E_END_OF_CHUNKS exception.
//
throw new COMException(SR.Get(SRID.FilterEndOfChunks),
(int)FilterErrorCode.FILTER_E_END_OF_CHUNKS);
}
}
}
// copy the chunk public void CopyChunk(out STAT_CHUNK pStatChunk) => pStatChunk = m_chunk;
