How to change encoding to a downloaded file Kotlin - kotlin

Question

I'm making an app which will download a .zip file, unzip it and finally take the .srt file (which was zipped) and put it as subtitle file in exoplayer movie.
My problem
The file has greek letters inside and when I put it as a subtitle file I only see corrupted letters
What have I tried
Below is the code to unzip the file
fun writeZipAndUnZip(subtitlesLinks: ArrayList<String>, context: Context, body: ResponseBody?) {
if (body == null) { return }
val file = File(getSubsDirectory(), subtitlesLinks.first())
var inputStream: InputStream? = null
var outputStream: OutputStream? = null
try {
val fileReader = ByteArray(4096)
inputStream = body.byteStream()
outputStream = FileOutputStream(file)
while (true) {
var read = inputStream.read(fileReader)
if (read == -1) {
break
}
outputStream.write(fileReader, 0, read)
}
outputStream.flush()
unzip(context)
} catch (e: IOException) {
return
} finally {
inputStream?.close()
outputStream?.close()
}}
fun unzip(context: Context) {
val unzipPath = getSubsDirectory()
var count: Int
val buffer = ByteArray(4096)
val subFile = File(getSubsDirectory()).listFiles()?.first() ?: return
try {
val stream = FileInputStream(subFile.absolutePath)
ZipInputStream(stream).use { zis ->
var ze = ZipEntry("")
while (zis.nextEntry?.also { ze = it } != null) {
var fileName = ze.name
fileName = fileName.substring(fileName.indexOf("/") + 1)
val file = File(unzipPath, fileName)
val dir = if (ze.isDirectory) file else file.parentFile
if (!dir.isDirectory && !dir.mkdirs())
throw FileNotFoundException("Invalid path: " + dir.absolutePath)
if (ze.isDirectory) continue
val fileOutput = FileOutputStream(file)
try {
while (zis.read(buffer).also { count = it } != -1)
fileOutput.write(buffer, 0, count)
} catch (e: IOException) {
Timber.tag("ErrorZip").d(e.localizedMessage)
} finally {
val fileOutput = context.openFileOutput(fileName, Context.MODE_PRIVATE)
fileOutput.close()
}
}
}
} catch (e: IOException) {
Timber.tag("ErrorZip").d(e.localizedMessage)
}}
Here is the code I put subtitle in exoplayer
val subtitleFormat = Format.createTextSampleFormat(null, MimeTypes.APPLICATION_SUBRIP, Format.NO_VALUE, "el")
val subtitleSource = SingleSampleMediaSource(File(Utils.getSubsDirectory()).listFiles()!![1].toUri(), dataSourceFactory, subtitleFormat, C.TIME_UNSET)
mediaSource = MergingMediaSource(buildMediaSource(videoUrl), subtitleSource)
I also tried to resave the subtitle with Utf-8 encoding but I get some characters in greek and the most missing or incorrect using this code
fun encode() {
val charset = "UTF8"
val subFile = File(getSubsDirectory()).listFiles()!![1] ?: return
val inputStream: InputStream = subFile.absoluteFile.inputStream()
val inputString = inputStream.bufferedReader().use { it.readText() }
val writer = OutputStreamWriter(FileOutputStream(File(getSubsDirectory(), "subs.srt")), charset)
writer.write(inputString)
writer.close()
}

Answer 1

Probably the file you are trying to read is in a different encoding than the System default (Android uses utf-8). You need to read the file at the 'correct' encoding format (for Greek usually is Windows-1253) and then save it to utf-8.