Is anyone working with files in their multiplatform project?

# multiplatform

[saket]

Is anyone working with files in their multiplatform project?

[basher]

We're doing it with json mocks in tests with some codegen

[saket]

Are you delegating the calls using expect/actual to the platform? Or are you writing them in kotlin native using expect/actual?

I’m going to need this soon for Press and it’d be nice to have some references.

[Casey Brooks]

KorIO might be what you need https://korlibs.soywiz.com/korio/

[Dominaezzz]

I have expect/actual for a fun readText(path: String): String and a fun readBytes(path: String): ByteArray function.

[basher]

yeah expect actual

[saket]

@Dominaezzz @basher are you using posix apis on native?

[basher]

no. for iOS, just iOS ones. on windows, we tried posix and struggled to get it working — ended up using windows APIs there

[saket]

Also, can I see your actual implementations somewhere?

[Dominaezzz]

Posix https://github.com/Dominaezzz/kgl-vulkan-samples/blob/master/utils/src/nativeMain/kotlin/sample/utils/FileIONative.kt

[saket]

@Casey Brooks Ooh this looks interesting. I’ll take a look, thank you!

[saket]

@basher gotcha. Any specific issues you ran into?

@Dominaezzz this is useful, thank you!

[saket]

fwiw I also found https://github.com/caffeine-mgn/pw.binom.io but it doesn’t support apple

[basher]

@ExperimentalUnsignedTypes
internal actual fun loadMock(path: String): String {
    val fd = open(path, O_RDONLY)
    throwIfFailed(fd)
    return try {
        val size = lseek(fd, 0, SEEK_END)
        throwIfFailed(size)
        throwIfFailed(lseek(fd, 0, SEEK_SET))

        val buf = ByteArray(size)
        buf.usePinned { pinned ->
            throwIfFailed(read(fd, pinned.addressOf(0), size.toUInt()))
            buf.decodeToString()
        }

    } finally {
        close(fd)
    }

[basher]

this was the posix one we were trying to get to work on windows, but it had off-by-one-type errors when the String was passed to kotlinx.serialization

[basher]

we ended up switching to a windows-specific implementation, which worked

[saket]

I see, thanks for sharing!