Created
November 3, 2017 14:11
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Partial InputStream for Android
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package com.github.develjs; | |
import android.support.annotation.NonNull; | |
import java.io.IOException; | |
import java.io.InputStream; | |
public class PartInputStream extends InputStream { | |
private int subAvailable = 0; // <= 0, offset of stop-position relatively from end of main stream | |
private InputStream stream; | |
public PartInputStream(@NonNull InputStream stream, int offset, int length) throws Exception { | |
// super(); | |
this.stream = stream; | |
int available = stream.available(); | |
offset = Math.min(offset, available); | |
subAvailable = Math.min(offset + length, available) - available; | |
this.skip(offset); | |
} | |
@Override | |
public int available() throws IOException { | |
return stream.available() + subAvailable; | |
} | |
@Override | |
public void close() throws IOException { | |
stream.close(); | |
super.close(); | |
} | |
@Override | |
public int read() throws IOException { | |
if (available()>0) | |
return stream.read(); | |
else | |
return -1; | |
} | |
@Override | |
public int read(@NonNull byte[] buffer, int byteOffset, int byteCount) throws IOException { | |
return stream.read(buffer, byteOffset, Math.min(byteCount, available())); | |
} | |
} |
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