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Merge changes from topic "exif-webp"

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* changes:
  Add function for adding EXIF to WebP files
  Remove hidden API usage in ExifInterface
This commit is contained in:
Treehugger Robot
2020-09-22 20:10:22 +00:00
committed by Gerrit Code Review
parent 8f150a68d9 c6cf32b623
commit b2356e4d98
2 changed files with 453 additions and 94 deletions
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430
media/java/android/media/ExifInterface.java
View File

@@ -16,6 +16,12 @@
package android.media;
import static android.media.ExifInterfaceUtils.byteArrayToHexString;
import static android.media.ExifInterfaceUtils.closeQuietly;
import static android.media.ExifInterfaceUtils.convertToLongArray;
import static android.media.ExifInterfaceUtils.copy;
import static android.media.ExifInterfaceUtils.startsWith;
import android.annotation.CurrentTimeMillisLong;
import android.annotation.IntDef;
import android.annotation.NonNull;
@@ -32,10 +38,6 @@ import android.util.Log;
import android.util.Pair;
import com.android.internal.annotations.GuardedBy;
import com.android.internal.util.ArrayUtils;
import libcore.io.IoUtils;
import libcore.io.Streams;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
@@ -73,11 +75,11 @@ import java.util.regex.Pattern;
import java.util.zip.CRC32;
/**
* This is a class for reading and writing Exif tags in a JPEG file or a RAW image file.
* This is a class for reading and writing Exif tags in various image file formats.
* <p>
* Supported formats are: JPEG, DNG, CR2, NEF, NRW, ARW, RW2, ORF, PEF, SRW, RAF and HEIF.
* Supported for reading: JPEG, PNG, WebP, HEIF, DNG, CR2, NEF, NRW, ARW, RW2, ORF, PEF, SRW, RAF.
* <p>
* Attribute mutation is supported for JPEG image files.
* Supported for writing: JPEG, PNG, WebP.
* <p>
* Note: It is recommended to use the <a href="{@docRoot}jetpack/androidx.html">AndroidX</a>
* <a href="{@docRoot}reference/androidx/exifinterface/media/ExifInterface.html">ExifInterface
@@ -583,6 +585,15 @@ public class ExifInterface {
private static final int WEBP_FILE_SIZE_BYTE_LENGTH = 4;
private static final byte[] WEBP_CHUNK_TYPE_EXIF = new byte[]{(byte) 0x45, (byte) 0x58,
(byte) 0x49, (byte) 0x46};
private static final byte[] WEBP_VP8_SIGNATURE = new byte[]{(byte) 0x9d, (byte) 0x01,
(byte) 0x2a};
private static final byte WEBP_VP8L_SIGNATURE = (byte) 0x2f;
private static final byte[] WEBP_CHUNK_TYPE_VP8X = "VP8X".getBytes(Charset.defaultCharset());
private static final byte[] WEBP_CHUNK_TYPE_VP8L = "VP8L".getBytes(Charset.defaultCharset());
private static final byte[] WEBP_CHUNK_TYPE_VP8 = "VP8 ".getBytes(Charset.defaultCharset());
private static final byte[] WEBP_CHUNK_TYPE_ANIM = "ANIM".getBytes(Charset.defaultCharset());
private static final byte[] WEBP_CHUNK_TYPE_ANMF = "ANMF".getBytes(Charset.defaultCharset());
private static final int WEBP_CHUNK_TYPE_VP8X_DEFAULT_LENGTH = 10;
private static final int WEBP_CHUNK_TYPE_BYTE_LENGTH = 4;
private static final int WEBP_CHUNK_SIZE_BYTE_LENGTH = 4;
@@ -1540,7 +1551,7 @@ public class ExifInterface {
in = new FileInputStream(fileDescriptor, isFdOwner);
loadAttributes(in);
} finally {
IoUtils.closeQuietly(in);
closeQuietly(in);
}
}
@@ -1607,7 +1618,7 @@ public class ExifInterface {
}
/**
* Returns whether ExifInterface currently supports parsing data from the specified mime type
* Returns whether ExifInterface currently supports reading data from the specified mime type
* or not.
*
* @param mimeType the string value of mime type
@@ -1631,6 +1642,8 @@ public class ExifInterface {
case "image/x-fuji-raf":
case "image/heic":
case "image/heif":
case "image/png":
case "image/webp":
return true;
default:
return false;
@@ -2044,18 +2057,21 @@ public class ExifInterface {
* {@link #setAttribute(String,String)} to set all attributes to write and
* make a single call rather than multiple calls for each attribute.
* <p>
* This method is only supported for JPEG and PNG files.
* This method is supported for JPEG, PNG and WebP files.
* <p class="note">
* Note: after calling this method, any attempts to obtain range information
* from {@link #getAttributeRange(String)} or {@link #getThumbnailRange()}
* will throw {@link IllegalStateException}, since the offsets may have
* changed in the newly written file.
* <p>
* For WebP format, the Exif data will be stored as an Extended File Format, and it may not be
* supported for older readers.
* </p>
*/
public void saveAttributes() throws IOException {
if (!mIsSupportedFile || (mMimeType != IMAGE_TYPE_JPEG && mMimeType != IMAGE_TYPE_PNG)) {
throw new IOException("ExifInterface only supports saving attributes on JPEG or PNG "
+ "formats.");
if (!isSupportedFormatForSavingAttributes()) {
throw new IOException("ExifInterface only supports saving attributes on JPEG, PNG, "
+ "or WebP formats.");
}
if (mIsInputStream || (mSeekableFileDescriptor == null && mFilename == null)) {
throw new IOException(
@@ -2084,21 +2100,17 @@ public class ExifInterface {
throw new IOException("Couldn't rename to " + tempFile.getAbsolutePath());
}
} else if (mSeekableFileDescriptor != null) {
if (mMimeType == IMAGE_TYPE_JPEG) {
tempFile = File.createTempFile("temp", "jpg");
} else if (mMimeType == IMAGE_TYPE_PNG) {
tempFile = File.createTempFile("temp", "png");
}
tempFile = File.createTempFile("temp", "tmp");
Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET);
in = new FileInputStream(mSeekableFileDescriptor);
out = new FileOutputStream(tempFile);
Streams.copy(in, out);
copy(in, out);
}
} catch (Exception e) {
throw new IOException("Failed to copy original file to temp file", e);
} finally {
IoUtils.closeQuietly(in);
IoUtils.closeQuietly(out);
closeQuietly(in);
closeQuietly(out);
}
in = null;
@@ -2118,6 +2130,8 @@ public class ExifInterface {
saveJpegAttributes(bufferedIn, bufferedOut);
} else if (mMimeType == IMAGE_TYPE_PNG) {
savePngAttributes(bufferedIn, bufferedOut);
} else if (mMimeType == IMAGE_TYPE_WEBP) {
saveWebpAttributes(bufferedIn, bufferedOut);
}
}
} catch (Exception e) {
@@ -2129,8 +2143,8 @@ public class ExifInterface {
}
throw new IOException("Failed to save new file", e);
} finally {
IoUtils.closeQuietly(in);
IoUtils.closeQuietly(out);
closeQuietly(in);
closeQuietly(out);
tempFile.delete();
}
@@ -2215,7 +2229,7 @@ public class ExifInterface {
// Couldn't get a thumbnail image.
Log.d(TAG, "Encountered exception while getting thumbnail", e);
} finally {
IoUtils.closeQuietly(in);
closeQuietly(in);
}
return null;
}
@@ -2536,7 +2550,7 @@ public class ExifInterface {
}
loadAttributes(in);
} finally {
IoUtils.closeQuietly(in);
closeQuietly(in);
}
}
@@ -2599,7 +2613,6 @@ public class ExifInterface {
ByteOrderedDataInputStream signatureInputStream = null;
try {
signatureInputStream = new ByteOrderedDataInputStream(signatureCheckBytes);
signatureInputStream.setByteOrder(ByteOrder.BIG_ENDIAN);
long chunkSize = signatureInputStream.readInt();
byte[] chunkType = new byte[4];
@@ -2839,14 +2852,14 @@ public class ExifInterface {
bytesRead += length;
length = 0;
if (ArrayUtils.startsWith(bytes, IDENTIFIER_EXIF_APP1)) {
if (startsWith(bytes, IDENTIFIER_EXIF_APP1)) {
final long offset = start + IDENTIFIER_EXIF_APP1.length;
final byte[] value = Arrays.copyOfRange(bytes,
IDENTIFIER_EXIF_APP1.length, bytes.length);
// Save offset values for handleThumbnailFromJfif() function
mExifOffset = (int) offset;
readExifSegment(value, imageType);
} else if (ArrayUtils.startsWith(bytes, IDENTIFIER_XMP_APP1)) {
} else if (startsWith(bytes, IDENTIFIER_XMP_APP1)) {
// See XMP Specification Part 3: Storage in Files, 1.1.3 JPEG, Table 6
final long offset = start + IDENTIFIER_XMP_APP1.length;
final byte[] value = Arrays.copyOfRange(bytes,
@@ -3390,6 +3403,9 @@ public class ExifInterface {
bytesRead += in.skipBytes(WEBP_SIGNATURE_2.length);
try {
while (true) {
// TODO: Check the first Chunk Type, and if it is VP8X, check if the chunks are
// ordered properly.
// Each chunk is made up of three parts:
// 1) Chunk FourCC: 4-byte concatenating four ASCII characters.
// 2) Chunk Size: 4-byte unsigned integer indicating the size of the chunk.
@@ -3415,6 +3431,9 @@ public class ExifInterface {
// Save offset values for handling thumbnail and attribute offsets.
mExifOffset = bytesRead;
readExifSegment(payload, IFD_TYPE_PRIMARY);
// Save offset values for handleThumbnailFromJfif() function
mExifOffset = bytesRead;
break;
} else {
// Add a single padding byte at end if chunk size is odd
@@ -3527,7 +3546,7 @@ public class ExifInterface {
dataOutputStream.writeByte(MARKER);
dataOutputStream.writeByte(marker);
// Copy all the remaining data
Streams.copy(dataInputStream, dataOutputStream);
copy(dataInputStream, dataOutputStream);
return;
}
default: {
@@ -3605,7 +3624,264 @@ public class ExifInterface {
dataOutputStream.writeInt((int) crc.getValue());
}
// Copy the rest of the file
Streams.copy(dataInputStream, dataOutputStream);
copy(dataInputStream, dataOutputStream);
}
// A WebP file has a header and a series of chunks.
// The header is composed of:
// "RIFF" + File Size + "WEBP"
//
// The structure of the chunks can be divided largely into two categories:
// 1) Contains only image data,
// 2) Contains image data and extra data.
// In the first category, there is only one chunk: type "VP8" (compression with loss) or "VP8L"
// (lossless compression).
// In the second category, the first chunk will be of type "VP8X", which contains flags
// indicating which extra data exist in later chunks. The proceeding chunks must conform to
// the following order based on type (if they exist):
// Color Profile ("ICCP") + Animation Control Data ("ANIM") + Image Data ("VP8"/"VP8L")
// + Exif metadata ("EXIF") + XMP metadata ("XMP")
//
// And in order to have EXIF data, a WebP file must be of the second structure and thus follow
// the following rules:
// 1) "VP8X" chunk as the first chunk,
// 2) flag for EXIF inside "VP8X" chunk set to 1, and
// 3) contain the "EXIF" chunk in the correct order amongst other chunks.
//
// Based on these rules, this API will support three different cases depending on the contents
// of the original file:
// 1) "EXIF" chunk already exists
// -> replace it with the new "EXIF" chunk
// 2) "EXIF" chunk does not exist and the first chunk is "VP8" or "VP8L"
// -> add "VP8X" before the "VP8"/"VP8L" chunk (with EXIF flag set to 1), and add new
// "EXIF" chunk after the "VP8"/"VP8L" chunk.
// 3) "EXIF" chunk does not exist and the first chunk is "VP8X"
// -> set EXIF flag in "VP8X" chunk to 1, and add new "EXIF" chunk at the proper location.
//
// See https://developers.google.com/speed/webp/docs/riff_container for more details.
private void saveWebpAttributes(InputStream inputStream, OutputStream outputStream)
throws IOException {
if (DEBUG) {
Log.d(TAG, "saveWebpAttributes starting with (inputStream: " + inputStream
+ ", outputStream: " + outputStream + ")");
}
ByteOrderedDataInputStream totalInputStream =
new ByteOrderedDataInputStream(inputStream, ByteOrder.LITTLE_ENDIAN);
ByteOrderedDataOutputStream totalOutputStream =
new ByteOrderedDataOutputStream(outputStream, ByteOrder.LITTLE_ENDIAN);
// WebP signature
copy(totalInputStream, totalOutputStream, WEBP_SIGNATURE_1.length);
// File length will be written after all the chunks have been written
totalInputStream.skipBytes(WEBP_FILE_SIZE_BYTE_LENGTH + WEBP_SIGNATURE_2.length);
// Create a separate byte array to calculate file length
ByteArrayOutputStream nonHeaderByteArrayOutputStream = null;
try {
nonHeaderByteArrayOutputStream = new ByteArrayOutputStream();
ByteOrderedDataOutputStream nonHeaderOutputStream =
new ByteOrderedDataOutputStream(nonHeaderByteArrayOutputStream,
ByteOrder.LITTLE_ENDIAN);
if (mExifOffset != 0) {
// EXIF chunk exists in the original file
// Tested by webp_with_exif.webp
int bytesRead = WEBP_SIGNATURE_1.length + WEBP_FILE_SIZE_BYTE_LENGTH
+ WEBP_SIGNATURE_2.length;
copy(totalInputStream, nonHeaderOutputStream,
mExifOffset - bytesRead - WEBP_CHUNK_TYPE_BYTE_LENGTH
- WEBP_CHUNK_SIZE_BYTE_LENGTH);
// Skip input stream to the end of the EXIF chunk
totalInputStream.skipBytes(WEBP_CHUNK_TYPE_BYTE_LENGTH);
int exifChunkLength = totalInputStream.readInt();
totalInputStream.skipBytes(exifChunkLength);
// Write new EXIF chunk to output stream
int exifSize = writeExifSegment(nonHeaderOutputStream);
} else {
// EXIF chunk does not exist in the original file
byte[] firstChunkType = new byte[WEBP_CHUNK_TYPE_BYTE_LENGTH];
if (totalInputStream.read(firstChunkType) != firstChunkType.length) {
throw new IOException("Encountered invalid length while parsing WebP chunk "
+ "type");
}
if (Arrays.equals(firstChunkType, WEBP_CHUNK_TYPE_VP8X)) {
// Original file already includes other extra data
int size = totalInputStream.readInt();
// WebP files have a single padding byte at the end if the chunk size is odd.
byte[] data = new byte[(size % 2) == 1 ? size + 1 : size];
totalInputStream.read(data);
// Set the EXIF flag to 1
data[0] = (byte) (data[0] | (1 << 3));
// Retrieve Animation flag--in order to check where EXIF data should start
boolean containsAnimation = ((data[0] >> 1) & 1) == 1;
// Write the original VP8X chunk
nonHeaderOutputStream.write(WEBP_CHUNK_TYPE_VP8X);
nonHeaderOutputStream.writeInt(size);
nonHeaderOutputStream.write(data);
// Animation control data is composed of 1 ANIM chunk and multiple ANMF
// chunks and since the image data (VP8/VP8L) chunks are included in the ANMF
// chunks, EXIF data should come after the last ANMF chunk.
// Also, because there is no value indicating the amount of ANMF chunks, we need
// to keep iterating through chunks until we either reach the end of the file or
// the XMP chunk (if it exists).
// Tested by webp_with_anim_without_exif.webp
if (containsAnimation) {
copyChunksUpToGivenChunkType(totalInputStream, nonHeaderOutputStream,
WEBP_CHUNK_TYPE_ANIM, null);
while (true) {
byte[] type = new byte[WEBP_CHUNK_TYPE_BYTE_LENGTH];
int read = inputStream.read(type);
if (!Arrays.equals(type, WEBP_CHUNK_TYPE_ANMF)) {
// Either we have reached EOF or the start of a non-ANMF chunk
writeExifSegment(nonHeaderOutputStream);
break;
}
copyWebPChunk(totalInputStream, nonHeaderOutputStream, type);
}
} else {
// Skip until we find the VP8 or VP8L chunk
copyChunksUpToGivenChunkType(totalInputStream, nonHeaderOutputStream,
WEBP_CHUNK_TYPE_VP8, WEBP_CHUNK_TYPE_VP8L);
writeExifSegment(nonHeaderOutputStream);
}
} else if (Arrays.equals(firstChunkType, WEBP_CHUNK_TYPE_VP8)
|| Arrays.equals(firstChunkType, WEBP_CHUNK_TYPE_VP8L)) {
int size = totalInputStream.readInt();
int bytesToRead = size;
// WebP files have a single padding byte at the end if the chunk size is odd.
if (size % 2 == 1) {
bytesToRead += 1;
}
// Retrieve image width/height
int widthAndHeight = 0;
int width = 0;
int height = 0;
int alpha = 0;
// Save VP8 frame data for later
byte[] vp8Frame = new byte[3];
if (Arrays.equals(firstChunkType, WEBP_CHUNK_TYPE_VP8)) {
totalInputStream.read(vp8Frame);
// Check signature
byte[] vp8Signature = new byte[3];
if (totalInputStream.read(vp8Signature) != vp8Signature.length
|| !Arrays.equals(WEBP_VP8_SIGNATURE, vp8Signature)) {
throw new IOException("Encountered error while checking VP8 "
+ "signature");
}
// Retrieve image width/height
widthAndHeight = totalInputStream.readInt();
width = (widthAndHeight << 18) >> 18;
height = (widthAndHeight << 2) >> 18;
bytesToRead -= (vp8Frame.length + vp8Signature.length + 4);
} else if (Arrays.equals(firstChunkType, WEBP_CHUNK_TYPE_VP8L)) {
// Check signature
byte vp8lSignature = totalInputStream.readByte();
if (vp8lSignature != WEBP_VP8L_SIGNATURE) {
throw new IOException("Encountered error while checking VP8L "
+ "signature");
}
// Retrieve image width/height
widthAndHeight = totalInputStream.readInt();
// VP8L stores width - 1 and height - 1 values. See "2 RIFF Header" of
// "WebP Lossless Bitstream Specification"
width = ((widthAndHeight << 18) >> 18) + 1;
height = ((widthAndHeight << 4) >> 18) + 1;
// Retrieve alpha bit
alpha = widthAndHeight & (1 << 3);
bytesToRead -= (1 /* VP8L signature */ + 4);
}
// Create VP8X with Exif flag set to 1
nonHeaderOutputStream.write(WEBP_CHUNK_TYPE_VP8X);
nonHeaderOutputStream.writeInt(WEBP_CHUNK_TYPE_VP8X_DEFAULT_LENGTH);
byte[] data = new byte[WEBP_CHUNK_TYPE_VP8X_DEFAULT_LENGTH];
// EXIF flag
data[0] = (byte) (data[0] | (1 << 3));
// ALPHA flag
data[0] = (byte) (data[0] | (alpha << 4));
// VP8X stores Width - 1 and Height - 1 values
width -= 1;
height -= 1;
data[4] = (byte) width;
data[5] = (byte) (width >> 8);
data[6] = (byte) (width >> 16);
data[7] = (byte) height;
data[8] = (byte) (height >> 8);
data[9] = (byte) (height >> 16);
nonHeaderOutputStream.write(data);
// Write VP8 or VP8L data
nonHeaderOutputStream.write(firstChunkType);
nonHeaderOutputStream.writeInt(size);
if (Arrays.equals(firstChunkType, WEBP_CHUNK_TYPE_VP8)) {
nonHeaderOutputStream.write(vp8Frame);
nonHeaderOutputStream.write(WEBP_VP8_SIGNATURE);
nonHeaderOutputStream.writeInt(widthAndHeight);
} else if (Arrays.equals(firstChunkType, WEBP_CHUNK_TYPE_VP8L)) {
nonHeaderOutputStream.write(WEBP_VP8L_SIGNATURE);
nonHeaderOutputStream.writeInt(widthAndHeight);
}
copy(totalInputStream, nonHeaderOutputStream, bytesToRead);
// Write EXIF chunk
writeExifSegment(nonHeaderOutputStream);
}
}
// Copy the rest of the file
copy(totalInputStream, nonHeaderOutputStream);
// Write file length + second signature
totalOutputStream.writeInt(nonHeaderByteArrayOutputStream.size()
+ WEBP_SIGNATURE_2.length);
totalOutputStream.write(WEBP_SIGNATURE_2);
nonHeaderByteArrayOutputStream.writeTo(totalOutputStream);
} catch (Exception e) {
throw new IOException("Failed to save WebP file", e);
} finally {
closeQuietly(nonHeaderByteArrayOutputStream);
}
}
private void copyChunksUpToGivenChunkType(ByteOrderedDataInputStream inputStream,
ByteOrderedDataOutputStream outputStream, byte[] firstGivenType,
byte[] secondGivenType) throws IOException {
while (true) {
byte[] type = new byte[WEBP_CHUNK_TYPE_BYTE_LENGTH];
if (inputStream.read(type) != type.length) {
throw new IOException("Encountered invalid length while copying WebP chunks up to"
+ "chunk type " + new String(firstGivenType, ASCII)
+ ((secondGivenType == null) ? "" : " or " + new String(secondGivenType,
ASCII)));
}
copyWebPChunk(inputStream, outputStream, type);
if (Arrays.equals(type, firstGivenType)
|| (secondGivenType != null && Arrays.equals(type, secondGivenType))) {
break;
}
}
}
private void copyWebPChunk(ByteOrderedDataInputStream inputStream,
ByteOrderedDataOutputStream outputStream, byte[] type) throws IOException {
int size = inputStream.readInt();
outputStream.write(type);
outputStream.writeInt(size);
// WebP files have a single padding byte at the end if the chunk size is odd.
copy(inputStream, outputStream, (size % 2) == 1 ? size + 1 : size);
}
// Reads the given EXIF byte area and save its tag data into attributes.
@@ -4358,14 +4634,22 @@ public class ExifInterface {
ifdOffsets[IFD_TYPE_INTEROPERABILITY], mExifByteOrder));
}
if (mMimeType == IMAGE_TYPE_JPEG) {
// Write JPEG specific data (APP1 size, APP1 identifier)
dataOutputStream.writeUnsignedShort(totalSize);
dataOutputStream.write(IDENTIFIER_EXIF_APP1);
} else if (mMimeType == IMAGE_TYPE_PNG) {
// Write PNG specific data (chunk size, chunk type)
dataOutputStream.writeInt(totalSize);
dataOutputStream.write(PNG_CHUNK_TYPE_EXIF);
switch (mMimeType) {
case IMAGE_TYPE_JPEG:
// Write JPEG specific data (APP1 size, APP1 identifier)
dataOutputStream.writeUnsignedShort(totalSize);
dataOutputStream.write(IDENTIFIER_EXIF_APP1);
break;
case IMAGE_TYPE_PNG:
// Write PNG specific data (chunk size, chunk type)
dataOutputStream.writeInt(totalSize);
dataOutputStream.write(PNG_CHUNK_TYPE_EXIF);
break;
case IMAGE_TYPE_WEBP:
// Write WebP specific data (chunk type, chunk size)
dataOutputStream.write(WEBP_CHUNK_TYPE_EXIF);
dataOutputStream.writeInt(totalSize);
break;
}
// Write TIFF Headers. See JEITA CP-3451C Section 4.5.2. Table 1.
@@ -4434,6 +4718,11 @@ public class ExifInterface {
dataOutputStream.write(getThumbnailBytes());
}
// For WebP files, add a single padding byte at end if chunk size is odd
if (mMimeType == IMAGE_TYPE_WEBP && totalSize % 2 == 1) {
dataOutputStream.writeByte(0);
}
// Reset the byte order to big endian in order to write remaining parts of the JPEG file.
dataOutputStream.setByteOrder(ByteOrder.BIG_ENDIAN);
@@ -4535,12 +4824,17 @@ public class ExifInterface {
private int mPosition;
public ByteOrderedDataInputStream(InputStream in) throws IOException {
this(in, ByteOrder.BIG_ENDIAN);
}
ByteOrderedDataInputStream(InputStream in, ByteOrder byteOrder) throws IOException {
mInputStream = in;
mDataInputStream = new DataInputStream(in);
mLength = mDataInputStream.available();
mPosition = 0;
// TODO (b/142218289): Need to handle case where input stream does not support mark
mDataInputStream.mark(mLength);
mByteOrder = byteOrder;
}
public ByteOrderedDataInputStream(byte[] bytes) throws IOException {
@@ -4866,63 +5160,11 @@ public class ExifInterface {
}
}
// Checks if there is a match
private boolean containsMatch(byte[] mainBytes, byte[] findBytes) {
for (int i = 0; i < mainBytes.length - findBytes.length; i++) {
for (int j = 0; j < findBytes.length; j++) {
if (mainBytes[i + j] != findBytes[j]) {
break;
}
if (j == findBytes.length - 1) {
return true;
}
}
private boolean isSupportedFormatForSavingAttributes() {
if (mIsSupportedFile && (mMimeType == IMAGE_TYPE_JPEG || mMimeType == IMAGE_TYPE_PNG
|| mMimeType == IMAGE_TYPE_WEBP)) {
return true;
}
return false;
}
/**
* Copies the given number of the bytes from {@code in} to {@code out}. Neither stream is
* closed.
*/
private 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.
*/
private 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;
}
private 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();
}
}

117
media/java/android/media/ExifInterfaceUtils.java Normal file
View File

@@ -0,0 +1,117 @@
/*
* 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 android.media;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Package private utility class for ExifInterface.
*/
class ExifInterfaceUtils {
/**
* Copies all of the bytes from {@code in} to {@code out}. Neither stream is closed.
* Returns the total number of bytes transferred.
*/
public 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.
*/
public 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.
*/
public 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;
}
/**
* Convert given byte array to hex string.
*/
public 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();
}
/**
* Checks if the start of the first byte array is equal to the second byte array.
*/
public static boolean startsWith(byte[] cur, byte[] val) {
if (cur == null || val == null) return false;
if (cur.length < val.length) return false;
if (cur.length == 0 || val.length == 0) return false;
for (int i = 0; i < val.length; i++) {
if (cur[i] != val[i]) return false;
}
return true;
}
/**
* Closes 'closeable', ignoring any checked exceptions. Does nothing if 'closeable' is null.
*/
public static void closeQuietly(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (RuntimeException rethrown) {
throw rethrown;
} catch (Exception ignored) {
}
}
}
}