The CompressionMethod property allows you to specify which compression algorithm should be used by the Compress method when compressing data.
| Value | Meaning |
|---|---|
| xcmStored | No compression or decompression should be applied at all. |
| xcmDeflated | Use the Deflate compression method. This algorithm provides fast compression and decompression speeds and achieves pretty good compression. |
| xcmDeflated64 | Use the Deflate64 ™ compression method. This method takes longer to compress data than Deflate, however it provides better compression. |
| xcmLZMA |
Use the LZMA compression method. The Lempel-Ziv-Markov chain-Algorithm (LZMA) uses an improved and optimized version of the Lempel-Ziv (LZ77) compression algorithm, backed by a Markov chain range encoder. It uses a variable dictionary size. Used in zip files created with WinZip 12.0 and up. LZMA typically provides much better compression than the Deflate and Deflate64 algorithms at the expense of speed and memory usage when compressing. It also typically provides compression ratios a little better than BZip2/BWT and PPMd while being a little faster. Compression usually requires (<dictionary size> * 11.5 + 6 MB). Decompression is usually fast and requires <dictionary size> + 16K. |
| xcmBurrowsWheeler | Use the BWT compression method. This algorithm often provides superior compression on many popular file types such as database, picture, text and executable files. It takes longer to compress or uncompress data with this algorithm vs. the standard Deflate algorithm. |
xcmDeflated
| Declaration (DLL API) | |
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