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Diffstat (limited to 'java/com/android/dialer/callcomposer/camera/exif/CountedDataInputStream.java')
-rw-r--r--java/com/android/dialer/callcomposer/camera/exif/CountedDataInputStream.java129
1 files changed, 129 insertions, 0 deletions
diff --git a/java/com/android/dialer/callcomposer/camera/exif/CountedDataInputStream.java b/java/com/android/dialer/callcomposer/camera/exif/CountedDataInputStream.java
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+++ b/java/com/android/dialer/callcomposer/camera/exif/CountedDataInputStream.java
@@ -0,0 +1,129 @@
+/*
+ * 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);
+ }
+}