#ifndef _NTIOAPI_H

/**
 * The NtReadFileScatter routine reads data from a file and scatters it into a set of buffers.
 *
 * \param[in] FileHandle Handle to the file.
 * \param[in, optional] Event Handle to an event.
 * \param[in, optional] ApcRoutine Pointer to an APC routine.
 * \param[in, optional] ApcContext Pointer to an APC context.
 * \param[out] IoStatusBlock Pointer to an IO_STATUS_BLOCK structure.
 * \param[in] SegmentArray Pointer to an array of FILE_SEGMENT_ELEMENT structures that specify the buffers.
 * \param[in] Length The number of bytes to be read from the file.
 * \param[in, optional] ByteOffset Pointer to a variable that specifies the starting byte offset in the file.
 * \param[in, optional] Key Device and intermediate drivers should set this pointer to NULL.
 * \return NTSTATUS Successful or errant status.
 * \sa https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-readfilescatter
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtReadFileScatter(
    _In_ HANDLE FileHandle,
    _In_opt_ HANDLE Event,
    _In_opt_ PIO_APC_ROUTINE ApcRoutine,
    _In_opt_ PVOID ApcContext,
    _Out_ PIO_STATUS_BLOCK IoStatusBlock,
    _In_ PFILE_SEGMENT_ELEMENT SegmentArray,
    _In_ ULONG Length,
    _In_opt_ PLARGE_INTEGER ByteOffset,
    _In_opt_ PULONG Key
    );

#endif
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#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwReadFileScatter(
    _In_ HANDLE FileHandle,
    _In_opt_ HANDLE Event,
    _In_opt_ PIO_APC_ROUTINE ApcRoutine,
    _In_opt_ PVOID ApcContext,
    _Out_ PIO_STATUS_BLOCK IoStatusBlock,
    _In_ PFILE_SEGMENT_ELEMENT SegmentArray,
    _In_ ULONG Length,
    _In_opt_ PLARGE_INTEGER ByteOffset,
    _In_opt_ PULONG Key
    );

#endif
View code on GitHub