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Data Compression and Archiving
Members of CompressionParameter b bounds Return the (lower, upper) int bounds of a compression parameter. c chain_log Size of the multi-probe search table, as a power of two. checksum_flag A four-byte checksum using XXHash64 of the uncompressed content is written at the end of each frame. compression_level A high-level means of setting other compression parameters that affect the speed and ratio of compressing data. content_size_flag Write the size of the data to be compressed into the Zstandard frame header when known prior to compressing. d dict_id_flag When compressing with a ZstdDict, the dictionary’s ID is written into the frame header. e enable_long_distance_matching Long distance matching can be used to improve compression for large inputs by finding large matches at greater distances. h hash_log Size of the initial probe table, as a power of two. j job_size Size of a compression job, in bytes. l ldm_bucket_size_log Log size of each bucket in the long distance matcher hash table for collision resolution. ldm_hash_log Size of the table for long distance matching, as a power of two. ldm_hash_rate_log Frequency of inserting/looking up entries into the long distance matcher hash table. n nb_workers Select how many threads will be spawned to compress in parallel. o overlap_log Sets how much data is reloaded from previous jobs (threads) for new jobs to be used by the look behind window during compression. s search_log Number of search attempts, as a power of two. strategy The higher the value of selected strategy, the more complex the compression technique used by zstd, resulting in higher compression ratios but slower compression. t target_length The impact of this field depends on the selected Strategy. w window_log Maximum allowed back-reference distance the compressor can use when compressing data, expressed as power of two, 1 << window_log bytes.
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