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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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.android.dialer.callcomposer.camera.exif;
import com.android.dialer.common.Assert;
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;
// allocate a byte buffer for a long value;
private final byte[] mByteArray = new byte[8];
private final ByteBuffer mByteBuffer = ByteBuffer.wrap(mByteArray);
CountedDataInputStream(InputStream in) {
super(in);
}
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;
}
private void skipOrThrow(long length) throws IOException {
if (skip(length) != length) {
throw new EOFException();
}
}
void skipTo(long target) throws IOException {
long cur = mCount;
long diff = target - cur;
Assert.checkArgument(diff >= 0);
skipOrThrow(diff);
}
private void readOrThrow(byte[] b, int off, int len) throws IOException {
int r = read(b, off, len);
if (r != len) {
throw new EOFException();
}
}
private void readOrThrow(byte[] b) throws IOException {
readOrThrow(b, 0, b.length);
}
void setByteOrder(ByteOrder order) {
mByteBuffer.order(order);
}
ByteOrder getByteOrder() {
return mByteBuffer.order();
}
short readShort() throws IOException {
readOrThrow(mByteArray, 0, 2);
mByteBuffer.rewind();
return mByteBuffer.getShort();
}
int readUnsignedShort() throws IOException {
return readShort() & 0xffff;
}
int readInt() throws IOException {
readOrThrow(mByteArray, 0, 4);
mByteBuffer.rewind();
return mByteBuffer.getInt();
}
long readUnsignedInt() throws IOException {
return readInt() & 0xffffffffL;
}
String readString(int n, Charset charset) throws IOException {
byte[] buf = new byte[n];
readOrThrow(buf);
return new String(buf, charset);
}
}
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