package com.android.gallery3d.exif;
import java.io.EOFException;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.charset.Charset;
class CountedDataInputStream extends FilterInputStream {
private int mCount = 0;
private final byte mByteArray[] = new byte[8];
private final ByteBuffer mByteBuffer = ByteBuffer.wrap(mByteArray);
protected CountedDataInputStream(InputStream in) {
super(in);
}
public int getReadByteCount() {
return mCount;
}
@Override
public int read(byte[] b) throws IOException {
int r = in.read(b);
mCount += (r >= 0) ? r : 0;
return r;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
int r = in.read(b, off, len);
mCount += (r >= 0) ? r : 0;
return r;
}
@Override
public int read() throws IOException {
int r = in.read();
mCount += (r >= 0) ? 1 : 0;
return r;
}
@Override
public long skip(long length) throws IOException {
long skip = in.skip(length);
mCount += skip;
return skip;
}
public void skipOrThrow(long length) throws IOException {
if (skip(length) != length) throw new EOFException();
}
public void skipTo(long target) throws IOException {
long cur = mCount;
long diff = target - cur;
assert(diff >= 0);
skipOrThrow(diff);
}
public void readOrThrow(byte[] b, int off, int len) throws IOException {
int r = read(b, off, len);
if (r != len) throw new EOFException();
}
public void readOrThrow(byte[] b) throws IOException {
readOrThrow(b, 0, b.length);
}
public void setByteOrder(ByteOrder order) {
mByteBuffer.order(order);
}
public ByteOrder getByteOrder() {
return mByteBuffer.order();
}
public short readShort() throws IOException {
readOrThrow(mByteArray, 0 ,2);
mByteBuffer.rewind();
return mByteBuffer.getShort();
}
public int readUnsignedShort() throws IOException {
return readShort() & 0xffff;
}
public int readInt() throws IOException {
readOrThrow(mByteArray, 0 , 4);
mByteBuffer.rewind();
return mByteBuffer.getInt();
}
public long readUnsignedInt() throws IOException {
return readInt() & 0xffffffffL;
}
public long readLong() throws IOException {
readOrThrow(mByteArray, 0 , 8);
mByteBuffer.rewind();
return mByteBuffer.getLong();
}
public String readString(int n) throws IOException {
byte buf[] = new byte[n];
readOrThrow(buf);
return new String(buf, "UTF8");
}
public String readString(int n, Charset charset) throws IOException {
byte buf[] = new byte[n];
readOrThrow(buf);
return new String(buf, charset);
}
}