1 /*
2  * Copyright 2017 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *     https://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package trebuchet.extras
18 
19 import trebuchet.io.BufferProducer
20 import trebuchet.io.DataSlice
21 import java.io.File
22 import java.io.InputStream
23 
24 typealias ProgressCallback = ((Long, Long) -> Unit)
25 
26 class InputStreamAdapter(val inputStream: InputStream,
27                          val totalSize: Long = 0,
28                          val progressCallback: ProgressCallback? = null) : BufferProducer {
29     constructor(file: File, progressCallback: ProgressCallback? = null)
30             : this(file.inputStream(), file.length(), progressCallback)
31 
32     var totalRead: Long = 0
33     var hitEof = false
34 
nextnull35     override fun next(): DataSlice? {
36         if (hitEof) return null
37         val buffer = ByteArray(2 * 1024 * 1024)
38         val read = inputStream.read(buffer)
39         if (read == -1) {
40             hitEof = true
41             return null
42         }
43         totalRead += read
44         progressCallback?.let { it.invoke(totalRead, totalSize) }
45         return DataSlice(buffer, 0, read)
46     }
47 
closenull48     override fun close() {
49         hitEof = true
50         inputStream.close()
51     }
52 }