com.intel.analytics.bigdl.utils.tf.TFRecordWriter.scala Maven / Gradle / Ivy
/*
* Copyright 2016 The BigDL Authors.
*
* 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 com.intel.analytics.bigdl.utils.tf
import java.io.OutputStream
import java.nio.{ByteBuffer, ByteOrder}
import com.intel.analytics.bigdl.utils.Crc32
class TFRecordWriter(out: OutputStream) {
private def toByteArrayAsLong(data: Long): Array[Byte] = {
val buff = new Array[Byte](8)
val bb = ByteBuffer.wrap(buff)
bb.order(ByteOrder.LITTLE_ENDIAN)
bb.putLong(data)
buff
}
private def toByteArrayAsInt(data: Int): Array[Byte] = {
val buff = new Array[Byte](4)
val bb = ByteBuffer.wrap(buff)
bb.order(ByteOrder.LITTLE_ENDIAN)
bb.putInt(data)
buff
}
def write(record: Array[Byte], offset: Int, length: Int): Unit = {
val len = toByteArrayAsLong(length)
out.write(len)
out.write(toByteArrayAsInt(Crc32.maskedCRC32(len).toInt))
out.write(record, offset, length)
out.write(toByteArrayAsInt(Crc32.maskedCRC32(record, offset, length).toInt))
}
def write(record: Array[Byte]): Unit = {
write(record, 0, record.length)
}
}