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Validation Test

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The validation test steps through the object one chunk at a time, verifying each individual chunk and all return codes. This function saves all returned STAT_CHUNK structures in a list. The validation test verifies the following conditions.

  • Chunk IDs are unique and increasing.
  • STAT_CHUNK.flags is a recognized chunk state (CHUNK_TEXT or CHUNK_VALUE).
  • STAT_CHUNK.breakType is a recognized break type (0,1,2,3,4).
  • If the filter initialization attributes specify that the filter should only return chunks containing internal value-type properties, STAT_CHUNK.idChunkSource must equal 0.
  • If chunk is not derived—that is, if it is not a internal value-type property—idChunkSource must equal idChunk.
  • IFilter::GetChunk returns S_OK or an accepted value (FILTER_E_END_OF_CHUNKS, FILTER_E_LINK_UNAVAILABLE, and so forth).
  • If the chunk contains text, IFilter::GetText returns S_OK, FILTER_S_LAST_TEXT, or FILTER_E_NO_MORE_TEXT.
  • If IFilter::GetText returns FILTER_S_LAST_TEXT, the next call to IFilter::GetText should return FILTER_E_NO_MORE_TEXT.
  • If the chunk contains a value, IFilter::GetValue returns S_OK or FILTER_E_NO_MORE_VALUES.