136 lines
4.2 KiB
Java
136 lines
4.2 KiB
Java
/*
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* Copyright 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.media;
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import android.system.ErrnoException;
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import android.system.Os;
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import android.util.Log;
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import java.io.Closeable;
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import java.io.FileDescriptor;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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/**
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* Package private utility class for ExifInterface.
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*/
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class ExifInterfaceUtils {
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private static final String TAG = "ExifInterface";
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/**
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* Copies all of the bytes from {@code in} to {@code out}. Neither stream is closed.
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* Returns the total number of bytes transferred.
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*/
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public static int copy(InputStream in, OutputStream out) throws IOException {
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int total = 0;
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byte[] buffer = new byte[8192];
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int c;
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while ((c = in.read(buffer)) != -1) {
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total += c;
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out.write(buffer, 0, c);
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}
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return total;
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}
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/**
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* Copies the given number of the bytes from {@code in} to {@code out}. Neither stream is
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* closed.
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*/
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public static void copy(InputStream in, OutputStream out, int numBytes) throws IOException {
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int remainder = numBytes;
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byte[] buffer = new byte[8192];
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while (remainder > 0) {
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int bytesToRead = Math.min(remainder, 8192);
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int bytesRead = in.read(buffer, 0, bytesToRead);
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if (bytesRead != bytesToRead) {
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throw new IOException("Failed to copy the given amount of bytes from the input"
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+ "stream to the output stream.");
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}
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remainder -= bytesRead;
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out.write(buffer, 0, bytesRead);
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}
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}
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/**
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* Convert given int[] to long[]. If long[] is given, just return it.
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* Return null for other types of input.
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*/
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public static long[] convertToLongArray(Object inputObj) {
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if (inputObj instanceof int[]) {
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int[] input = (int[]) inputObj;
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long[] result = new long[input.length];
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for (int i = 0; i < input.length; i++) {
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result[i] = input[i];
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}
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return result;
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} else if (inputObj instanceof long[]) {
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return (long[]) inputObj;
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}
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return null;
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}
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/**
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* Convert given byte array to hex string.
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*/
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public static String byteArrayToHexString(byte[] bytes) {
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StringBuilder sb = new StringBuilder(bytes.length * 2);
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for (int i = 0; i < bytes.length; i++) {
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sb.append(String.format("%02x", bytes[i]));
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}
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return sb.toString();
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}
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/**
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* Checks if the start of the first byte array is equal to the second byte array.
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*/
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public static boolean startsWith(byte[] cur, byte[] val) {
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if (cur == null || val == null) return false;
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if (cur.length < val.length) return false;
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if (cur.length == 0 || val.length == 0) return false;
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for (int i = 0; i < val.length; i++) {
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if (cur[i] != val[i]) return false;
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}
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return true;
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}
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/**
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* Closes 'closeable', ignoring any checked exceptions. Does nothing if 'closeable' is null.
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*/
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public static void closeQuietly(Closeable closeable) {
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if (closeable != null) {
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try {
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closeable.close();
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} catch (RuntimeException rethrown) {
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throw rethrown;
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} catch (Exception ignored) {
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}
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}
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}
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/**
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* Closes a file descriptor that has been duplicated.
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*/
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public static void closeFileDescriptor(FileDescriptor fd) {
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try {
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Os.close(fd);
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} catch (ErrnoException ex) {
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Log.e(TAG, "Error closing fd.", ex);
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}
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}
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}
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