ExifInterfaceUtils.java
/*
* Copyright 2020 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 androidx.exifinterface.media;
import android.media.MediaDataSource;
import android.media.MediaMetadataRetriever;
import android.os.Build;
import android.system.ErrnoException;
import android.system.Os;
import android.util.Log;
import androidx.annotation.DoNotInline;
import androidx.annotation.RequiresApi;
import java.io.Closeable;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
class ExifInterfaceUtils {
private static final String TAG = "ExifInterfaceUtils";
private ExifInterfaceUtils() {
// Prevent instantiation
}
/**
* Copies all of the bytes from {@code in} to {@code out}. Neither stream is closed.
* Returns the total number of bytes transferred.
*/
static int copy(InputStream in, OutputStream out) throws IOException {
int total = 0;
byte[] buffer = new byte[8192];
int c;
while ((c = in.read(buffer)) != -1) {
total += c;
out.write(buffer, 0, c);
}
return total;
}
/**
* Copies the given number of the bytes from {@code in} to {@code out}. Neither stream is
* closed.
*/
static void copy(InputStream in, OutputStream out, int numBytes) throws IOException {
int remainder = numBytes;
byte[] buffer = new byte[8192];
while (remainder > 0) {
int bytesToRead = Math.min(remainder, 8192);
int bytesRead = in.read(buffer, 0, bytesToRead);
if (bytesRead != bytesToRead) {
throw new IOException("Failed to copy the given amount of bytes from the input"
+ "stream to the output stream.");
}
remainder -= bytesRead;
out.write(buffer, 0, bytesRead);
}
}
/**
* Convert given int[] to long[]. If long[] is given, just return it.
* Return null for other types of input.
*/
static long[] convertToLongArray(Object inputObj) {
if (inputObj instanceof int[]) {
int[] input = (int[]) inputObj;
long[] result = new long[input.length];
for (int i = 0; i < input.length; i++) {
result[i] = input[i];
}
return result;
} else if (inputObj instanceof long[]) {
return (long[]) inputObj;
}
return null;
}
static boolean startsWith(byte[] cur, byte[] val) {
if (cur == null || val == null) {
return false;
}
if (cur.length < val.length) {
return false;
}
for (int i = 0; i < val.length; i++) {
if (cur[i] != val[i]) {
return false;
}
}
return true;
}
static String byteArrayToHexString(byte[] bytes) {
StringBuilder sb = new StringBuilder(bytes.length * 2);
for (int i = 0; i < bytes.length; i++) {
sb.append(String.format("%02x", bytes[i]));
}
return sb.toString();
}
static long parseSubSeconds(String subSec) {
try {
final int len = Math.min(subSec.length(), 3);
long sub = Long.parseLong(subSec.substring(0, len));
for (int i = len; i < 3; i++) {
sub *= 10;
}
return sub;
} catch (NumberFormatException e) {
// Ignored
}
return 0L;
}
/**
* Closes 'closeable', ignoring any checked exceptions. Does nothing if 'closeable' is null.
*/
static void closeQuietly(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (RuntimeException rethrown) {
throw rethrown;
} catch (Exception ignored) {
}
}
}
/**
* Closes a file descriptor that has been duplicated.
*/
static void closeFileDescriptor(FileDescriptor fd) {
// Os.dup and Os.close was introduced in API 21 so this method shouldn't be called
// in API < 21.
if (Build.VERSION.SDK_INT >= 21) {
try {
Api21Impl.close(fd);
// Catching ErrnoException will raise error in API < 21
} catch (Exception ex) {
Log.e(TAG, "Error closing fd.");
}
} else {
Log.e(TAG, "closeFileDescriptor is called in API < 21, which must be wrong.");
}
}
@RequiresApi(21)
static class Api21Impl {
private Api21Impl() {}
@DoNotInline
static FileDescriptor dup(FileDescriptor fileDescriptor) throws ErrnoException {
return Os.dup(fileDescriptor);
}
@DoNotInline
static long lseek(FileDescriptor fd, long offset, int whence) throws ErrnoException {
return Os.lseek(fd, offset, whence);
}
@DoNotInline
static void close(FileDescriptor fd) throws ErrnoException {
Os.close(fd);
}
}
@RequiresApi(23)
static class Api23Impl {
private Api23Impl() {}
@DoNotInline
static void setDataSource(MediaMetadataRetriever retriever, MediaDataSource dataSource) {
retriever.setDataSource(dataSource);
}
}
}