Reports

In addition to @Joop Eggen’s answer, I would suggest also checking for extra bytes after decompression has completed, and handling DataFormatException, because as far as I can see you wanted to decompress a single "data" byte array.

val toParse: ByteByffer = TODO()

inflater.setInput(toParse)
var messageBytes = ByteArray(toParse.remaining())
var messageSize = 0
while (!inflater.finished()) {
  if (messageSize == messageBytes.size) {
    messageBytes = messageBytes.copyOf(messageSize * 2)
  }
  try {
    val decompressedSize = inflater.inflate(messageBytes, messageSize, messageBytes.size - messageSize)
    messageSize += decompressedSize
    // A return value of 0 indicates that needsInput() or needsDictionary() should be called in order
    // to determine if more input data or a preset dictionary is required.
    if (decompressedSize == 0) {
      if (inflater.needsInput()) {
        throw IllegalArgumentException("Malformed message: insufficient bytes to complete decompression.")
      }
      if (inflater.needsDictionary()) {
        throw IllegalArgumentException("Malformed message: deflate with custom dictionary is not supported.")
      }
    }
  } catch (error: DataFormatException) {
    throw IllegalArgumentException("Malformed message: invalid deflate data: ${error.message}", error)
  }
}
// Returns the total number of bytes remaining in the input buffer.
// This can be used to find out what bytes still remain in the input buffer after decompression has finished.
if (inflater.remaining > 0) {
  throw IllegalArgumentException("Malformed message: extra ${inflater.remaining} bytes detected after decompression was complete.")
}
inflater.end() // or .reset() if you want to reuse

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