Function zstd_sys::ZSTD_estimateCStreamSize

pub unsafe extern "C" fn ZSTD_estimateCStreamSize(
    compressionLevel: c_int
) -> usize

ZSTD_estimateCStreamSize() : ZSTD_estimateCStreamSize() will provide a budget large enough for any compression level up to selected one. It will also consider src size to be arbitrarily “large”, which is worst case. If srcSize is known to always be small, ZSTD_estimateCStreamSize_usingCParams() can provide a tighter estimation. ZSTD_estimateCStreamSize_usingCParams() can be used in tandem with ZSTD_getCParams() to create cParams from compressionLevel. ZSTD_estimateCStreamSize_usingCCtxParams() can be used in tandem with ZSTD_CCtxParams_setParameter(). Only single-threaded compression is supported. This function will return an error code if ZSTD_c_nbWorkers is >= 1. Note : CStream size estimation is only correct for single-threaded compression. ZSTD_DStream memory budget depends on window Size. This information can be passed manually, using ZSTD_estimateDStreamSize, or deducted from a valid frame Header, using ZSTD_estimateDStreamSize_fromFrame(); Note : if streaming is init with function ZSTD_init?Stream_usingDict(), an internal ?Dict will be created, which additional size is not estimated here. In this case, get total size by adding ZSTD_estimate?DictSize Note 2 : only single-threaded compression is supported. ZSTD_estimateCStreamSize_usingCCtxParams() will return an error code if ZSTD_c_nbWorkers is >= 1. Note 3 : ZSTD_estimateCStreamSize* functions are not compatible with the Block-Level Sequence Producer API at this time. Size estimates assume that no external sequence producer is registered.