AuroraRuntime/Source/IO/FS/FileAttrs.NT.cpp

/***
    Copyright (C) 2023 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: FileAttrs.NT.cpp
    Date: 2023-2-4
    Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "FS.hpp"
#include "FileAttrs.NT.hpp"

namespace Aurora::IO::FS
{
    AUKN_SYM AuList<AuString> FileAttrsList(const AuString &path)
    {
        AuList<AuString> names;
        WIN32_FIND_STREAM_DATA data;

        if (path.empty())
        {
            SysPushErrorArg("Empty path provided");
            return {};
        }

        auto pathex = NormalizePathRet(path);
        if (pathex.empty())
        {
            return {};
        }

        auto win32Path = Locale::ConvertFromUTF8(pathex);
        if (win32Path.empty())
        {
            return {};
        }

        if (!pFindFirstStreamW)
        {
            SysPushErrorUnavailableError();
            return {};
        }

        auto hIterationHandle = pFindFirstStreamW(win32Path.c_str(),
                                                  FindStreamInfoStandard,
                                                  &data,
                                                  0);
        if (hIterationHandle == INVALID_HANDLE_VALUE)
        {
            if (!AuFS::FileExists(pathex))
            {
                SysPushErrorResourceMissing("Missing file: {}", path);
                return {};
            }

            SysPushErrorIO("Couldn't open a handle for: {}", path);
            return {};
        }

        do
        {
            AuString currentName;

            currentName = AuLocale::ConvertFromWChar(data.cStreamName, wcsnlen_s(data.cStreamName, AuArraySize(data.cStreamName)));
            if (currentName.empty())
            {
                continue;
            }

            // meh, noise. doesnt prevent an explicit read for this attribute.
            if (currentName == "::$DATA")
            {
                continue;
            }

            {
                // https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-fscc/a82e9105-2405-4e37-b2c3-28c773902d85
                // Seems like NTFS docs
                // "A file's data is an attribute; the "Data Attribute" known as $DATA"
                // ok, so, let's drop this suffix?

                if (AuEndsWith(currentName, "$DATA"))
                {
                    currentName.resize(currentName.size() - 5);
                }
            }

            int endRemoval = currentName.size() > 1 && currentName[currentName.size() - 1] == ':';
            if (currentName[0] == ':')
            {
                auto endLen = currentName.size() - 1;
                AuMemmove(currentName.data(), currentName.data() + 1, endLen);
                currentName.resize(endLen - endRemoval);
            }
            else if (endRemoval)
            {
                currentName.pop_back();
            }

            names.push_back(currentName);
        }
        while (pFindNextStreamW(hIterationHandle, &data));
        pFindClose(hIterationHandle);

        return names;
    }

    AUKN_SYM AuResult<Memory::ByteBuffer> FileAttrsGet(const AuString &path, const AuString &attr)
    {
        AuByteBuffer temp;

        if (!AuFS::ReadFile(path + ":" + attr, temp))
        {
            return {};
        }

        return AuMove(temp);
    }

    AUKN_SYM bool FileAttrsSet(const AuString &path, const AuString &attr, const Memory::MemoryViewRead &view)
    {
        return AuFS::WriteFile(path + ":" + attr, view);
    }

    AUKN_SYM bool FileAttrsDel(const AuString &path, const AuString &attr)
    {
        return AuFS::Remove(path + ":" + attr) || AuFS::FileExists(path);
    }
}