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JvmFileHandle.kt
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JvmFileHandle.kt
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/*
* Copyright (C) 2021 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package okio
import java.io.RandomAccessFile
internal class JvmFileHandle(
readWrite: Boolean,
private val randomAccessFile: RandomAccessFile
) : FileHandle(readWrite) {
@Synchronized
override fun protectedResize(size: Long) {
val currentSize = size()
val delta = size - currentSize
if (delta > 0) {
protectedWrite(currentSize, ByteArray(delta.toInt()), 0, delta.toInt())
} else {
randomAccessFile.setLength(size)
}
}
@Synchronized
override fun protectedSize(): Long {
return randomAccessFile.length()
}
@Synchronized
override fun protectedRead(
fileOffset: Long,
array: ByteArray,
arrayOffset: Int,
byteCount: Int
): Int {
randomAccessFile.seek(fileOffset)
var bytesRead = 0
while (bytesRead < byteCount) {
val readResult = randomAccessFile.read(array, arrayOffset, byteCount - bytesRead)
if (readResult == -1) {
if (bytesRead == 0) return -1
break
}
bytesRead += readResult
}
return bytesRead
}
@Synchronized
override fun protectedWrite(
fileOffset: Long,
array: ByteArray,
arrayOffset: Int,
byteCount: Int
) {
randomAccessFile.seek(fileOffset)
randomAccessFile.write(array, arrayOffset, byteCount)
}
@Synchronized
override fun protectedFlush() {
randomAccessFile.fd.sync()
}
@Synchronized
override fun protectedClose() {
randomAccessFile.close()
}
}