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copyTo

Platform and version requirements: JVM (1.0)
fun InputStream.copyTo(
    out: OutputStream, 
    bufferSize: Int = DEFAULT_BUFFER_SIZE
): Long

Copies this stream to the given output stream, returning the number of bytes copied

Note It is the caller's responsibility to close both of these resources.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io/java.io.-input-stream/copy-to.html