RtlCompressChunks - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTRTL_H

NTSYSAPI
NTSTATUS
NTAPI
RtlCompressChunks(
    _In_reads_bytes_(UncompressedBufferSize) PUCHAR UncompressedBuffer,
    _In_ ULONG UncompressedBufferSize,
    _Out_writes_bytes_(CompressedBufferSize) PUCHAR CompressedBuffer,
    _In_range_(>=, (UncompressedBufferSize - (UncompressedBufferSize / 16))) ULONG CompressedBufferSize,
    _Inout_updates_bytes_(CompressedDataInfoLength) PCOMPRESSED_DATA_INFO CompressedDataInfo,
    _In_range_(>, sizeof(COMPRESSED_DATA_INFO)) ULONG CompressedDataInfoLength,
    _In_ PVOID WorkSpace
    );

#endif

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This function is documented in Windows Driver Kit.