/*
 *  Copyright 1995 - 1997 Microsoft Corporation.
 *  Module Name:
 *      CreatePipeEx.NT.cpp
 *  Abstract:
 *      CreatePipe-like function that lets one or both handles be overlapped
 *  Author:
 *      Dave Hart  Summer 1997
 *  Revision History:
 *      J Reece Wilson 2022: Updated default size to match Linux's 16 page assumption
 *                           Renamed MyCreatePipeEx to CreatePipeEx
 *                           Now using Au atomics
 *                           Added second parameter check
 *      J Reece Wilson 202[2/3]: Rewritten in C++
 *      J Reece Wilson 2024: Widening
 *
 *  License:
 *      MICROSOFT LIMITED PUBLIC LICENSE version 1.1
*/
#include <Source/RuntimeInternal.hpp>

static AuUInt32 gPipeSerialNumber;

BOOL
APIENTRY
CreatePipeEx(
    OUT LPHANDLE lpReadPipe,
    OUT LPHANDLE lpWritePipe,
    IN LPSECURITY_ATTRIBUTES lpPipeAttributes,
    IN DWORD nSize,
    DWORD dwReadMode,
    DWORD dwWriteMode
)
{
    HANDLE ReadPipeHandle, WritePipeHandle;
    DWORD dwError;
    wchar_t sPipeNameBuffer[MAX_PATH];

    //
    // Only one valid OpenMode flag - FILE_FLAG_OVERLAPPED
    //

    if ((dwReadMode | dwWriteMode) & (~FILE_FLAG_OVERLAPPED))
    {
        SetLastError(ERROR_INVALID_PARAMETER);
        return FALSE;
    }

    //
    //  Check output arguments are non-null
    //

    if (!lpReadPipe || !lpWritePipe)
    {
        SetLastError(ERROR_INVALID_PARAMETER);
        return FALSE;
    }

    //
    //  Set the default pipe size
    //

    if (nSize == 0)
    {
        nSize = 16 * AuHwInfo::GetPageSize();
    }

    swprintf(sPipeNameBuffer,
             L"\\\\.\\Pipe\\AuroraProcessCStandardStream.%08x.%08x",
             GetCurrentProcessId(),
             AuAtomicAdd(&gPipeSerialNumber, 1u));

    ReadPipeHandle = CreateNamedPipeW(sPipeNameBuffer,
                                      PIPE_ACCESS_INBOUND | dwReadMode,
                                      PIPE_TYPE_BYTE | PIPE_WAIT,
                                      1,             // Number of pipes
                                      nSize,         // Out buffer size
                                      nSize,         // In buffer size
                                      120 * 1000,    // Timeout in ms
                                      lpPipeAttributes);

    if (!ReadPipeHandle)
    {
        return FALSE;
    }

    WritePipeHandle = Aurora::Win32Open2(sPipeNameBuffer,
                                         GENERIC_WRITE,
                                         0,                         // No sharing
                                         lpPipeAttributes,
                                         OPEN_EXISTING,
                                         dwWriteMode,
                                         NULL);

    if (INVALID_HANDLE_VALUE == WritePipeHandle)
    {
        dwError = GetLastError();
        CloseHandle(ReadPipeHandle);
        SetLastError(dwError);
        return FALSE;
    }

    *lpReadPipe  = ReadPipeHandle;
    *lpWritePipe = WritePipeHandle;
    return TRUE;
}