include/linux/zstd_lib.h

131  *            - ZSTD_CONTENTSIZE_UNKNOWN if the size cannot be determined
135  *            When `return==ZSTD_CONTENTSIZE_UNKNOWN`, data to decompress could be any size.
149 #define ZSTD_CONTENTSIZE_UNKNOWN (0ULL - 1)
470  *           In order to mean "unknown content size", pass constant ZSTD_CONTENTSIZE_UNKNOWN.
471  *           ZSTD_CONTENTSIZE_UNKNOWN is default value for any new frame.
473  *           It's discarded at the end of the frame, and replaced by ZSTD_CONTENTSIZE_UNKNOWN.
1314  *            - if the decompressed size cannot be determined: ZSTD_CONTENTSIZE_UNKNOWN
1318  *            When `return==ZSTD_CONTENTSIZE_UNKNOWN`, data to decompress could be any size.
1646  * `srcSize` can be unknown, in which case use ZSTD_CONTENTSIZE_UNKNOWN.
2179  * ZSTD_CONTENTSIZE_UNKNOWN. Note that, for compatibility with older programs,
2217  * If srcSize is not known at init time, use value ZSTD_CONTENTSIZE_UNKNOWN.
2249  * value ZSTD_CONTENTSIZE_UNKNOWN.
2262  * Note: ZSTD_resetCStream() interprets pledgedSrcSize == 0 as ZSTD_CONTENTSIZE_UNKNOWN, but
2263  *       ZSTD_CCtx_setPledgedSrcSize() does not do the same, so ZSTD_CONTENTSIZE_UNKNOWN must be
2269  *  If pledgedSrcSize is not known at reset time, use macro ZSTD_CONTENTSIZE_UNKNOWN.
2272  *  but it will change to mean "empty" in future version, so use macro ZSTD_CONTENTSIZE_UNKNOWN instead.
2390 ZSTDLIB_STATIC_API size_t ZSTD_copyCCtx(ZSTD_CCtx* cctx, const ZSTD_CCtx* preparedCCtx, unsigned long long pledgedSrcSize); /*<  note: if pledgedSrcSize is not known, use ZSTD_CONTENTSIZE_UNKNOWN */
2397 size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, ZSTD_parameters params, unsigned long long pledgedSrcSize); /*< pledgedSrcSize : If srcSize is not known at init time, use ZSTD_CONTENTSIZE_UNKNOWN */
2399 size_t ZSTD_compressBegin_usingCDict_advanced(ZSTD_CCtx* const cctx, const ZSTD_CDict* const cdict, ZSTD_frameParameters const fParams, unsigned long long const pledgedSrcSize);   /* compression parameters are already set within cdict. pledgedSrcSize must be correct. If srcSize is not known, use macro ZSTD_CONTENTSIZE_UNKNOWN */
2476     unsigned long long frameContentSize; /* if == ZSTD_CONTENTSIZE_UNKNOWN, it means this field is not available. 0 means "empty" */
2495 ZSTDLIB_STATIC_API size_t ZSTD_decodingBufferSize_min(unsigned long long windowSize, unsigned long long frameContentSize);  /*< when frame content size is not known, pass in frameContentSize == ZSTD_CONTENTSIZE_UNKNOWN */