#ifndef _NTRTL_H
NTSYSAPI
NTSTATUS
NTAPI
RtlDescribeChunk(
_In_ USHORT CompressionFormat,
_Inout_ PUCHAR *CompressedBuffer,
_In_ PUCHAR EndOfCompressedBufferPlus1,
_Out_ PUCHAR *ChunkBuffer,
_Out_ PULONG ChunkSize
);
View code on GitHub
This function is documented in Windows Driver Kit.