libcurl w/ scala-native

Main.scala

import scala.scalanative.native
import native._

@native.link("curl")
@native.extern object curl {
  import CurlTypes._

  @native.name("curl_global_init")
  def globalInit(flags: native.CLong): native.Ptr[Byte] = native.extern

  @native.name("curl_easy_init")
  def easyInit(): native.Ptr[Byte] = native.extern

  @native.name("curl_easy_setopt")
  def easySetOpt(handle: native.Ptr[Byte], option: native.UInt, args: native.CVararg*): native.UInt = native.extern

  @native.name("curl_easy_perform")
  def easyPerform(handle: native.Ptr[Byte]): native.UInt = native.extern

  @native.name("curl_slist_append")
  def slistAppend(slist: CurlSlist, data: native.CString): CurlSlist = native.extern

  @native.name("curl_slist_free_all")
  def slistFreeAll(slist: CurlSlist): Unit = native.extern
}

object CurlTypes {
  type CurlSlist = native.Ptr[native.CStruct2[CString, native.Ptr[Byte]]]
}

object CurlOpts {
  private def longOffset(offset: Int) = offset.toUInt
  private def stringOffset(offset: Int) = (offset + 10000).toUInt
  private def objectOffset(offset: Int) = (offset + 10000).toUInt

  val Url: native.UInt = stringOffset(2)
  val Headers: native.UInt = objectOffset(23)
  val Verbose: native.UInt = longOffset(41)
}

object Hello extends App {
  native.Zone { implicit z =>
    val headers = curl.slistAppend(null, c"User-Agent: scala-native-with-libcurl/0.0.0")
    curl.slistAppend(headers, c"Test-Header: foobarbaz")

    val curlHandle = curl.easyInit()
    curl.easySetOpt(curlHandle, CurlOpts.Verbose, 1)
    curl.easySetOpt(curlHandle, CurlOpts.Headers, headers)
    curl.easySetOpt(curlHandle, CurlOpts.Url, c"http://www.google.com")
    curl.easyPerform(curlHandle)
    curl.slistFreeAll(headers)
  }
}

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