Function zstd_sys::ZSTD_findDecompressedSize

pub unsafe extern "C" fn ZSTD_findDecompressedSize(
    src: *const c_void, 
    srcSize: usize
) -> c_ulonglong

ZSTD_findDecompressedSize() : * src should point the start of a series of ZSTD encoded and/or skippable frames * srcSize must be the exact size of this series * (i.e. there should be a frame boundary exactly srcSize bytes after src) * @return : the decompressed size of all data in the contained frames, as a 64-bit value if known * - if the decompressed size cannot be determined: ZSTD_CONTENTSIZE_UNKNOWN * - if an error occurred: ZSTD_CONTENTSIZE_ERROR * * note 1 : decompressed size is an optional field, that may not be present, especially in streaming mode. * When return==ZSTD_CONTENTSIZE_UNKNOWN, data to decompress could be any size. * In which case, it's necessary to use streaming mode to decompress data. * Optionally, application can still use ZSTD_decompress() while relying on implied limits. * (For example, data may be necessarily cut into blocks <= 16 KB). * note 2 : decompressed size is always present when compression is done with ZSTD_compress() * note 3 : decompressed size can be very large (64-bits value), * potentially larger than what local system can handle as a single memory segment. * In which case, it's necessary to use streaming mode to decompress data. * note 4 : If source is untrusted, decompressed size could be wrong or intentionally modified. * Always ensure result fits within application's authorized limits. * Each application can set its own limits. * note 5 : ZSTD_findDecompressedSize handles multiple frames, and so it must traverse the input to * read each contained frame header. This is efficient as most of the data is skipped, * however it does mean that all frame data must be present and valid.