/** ZSTD_ldm_getTableSize() :
* Estimate the space needed for long distance matching tables or 0 if LDM is
* disabled.
*/
public static nuint ZSTD_ldm_getTableSize(ldmParams_t @params)
{
nuint ldmHSize = ((nuint)(1)) << (int)@params.hashLog;
nuint ldmBucketSizeLog = ((@params.bucketSizeLog) < (@params.hashLog) ? (@params.bucketSizeLog) : (@params.hashLog));
nuint ldmBucketSize = ((nuint)(1)) << (int)(@params.hashLog - ldmBucketSizeLog);
nuint totalSize = ZSTD_cwksp_alloc_size(ldmBucketSize) + ZSTD_cwksp_alloc_size(ldmHSize * (nuint)(8));
return(@params.enableLdm != 0 ? totalSize : 0);
}
/** ZSTD_ldm_insertEntry() :
* Insert the entry with corresponding hash into the hash table */
private static void ZSTD_ldm_insertEntry(ldmState_t *ldmState, nuint hash, ldmEntry_t entry, ldmParams_t ldmParams)
{
byte *pOffset = ldmState->bucketOffsets + hash;
uint offset = *pOffset;
*(ZSTD_ldm_getBucket(ldmState, hash, ldmParams) + offset) = entry;
*pOffset = (byte)((offset + 1) & ((1U << (int)ldmParams.bucketSizeLog) - 1));
}
/** ZSTD_ldm_getBucket() :
* Returns a pointer to the start of the bucket associated with hash. */
private static ldmEntry_t *ZSTD_ldm_getBucket(ldmState_t *ldmState, nuint hash, ldmParams_t ldmParams)
{
return(ldmState->hashTable + (hash << (int)ldmParams.bucketSizeLog));
}
/** ZSTD_ldm_getSeqSpace() :
* Return an upper bound on the number of sequences that can be produced by
* the long distance matcher, or 0 if LDM is disabled.
*/
public static nuint ZSTD_ldm_getMaxNbSeq(ldmParams_t @params, nuint maxChunkSize)
{
return(@params.enableLdm != 0 ? (maxChunkSize / @params.minMatchLength) : 0);
}