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Allow creating AssetFileDescriptors for MemoryFiles.

Browse Source 
This allows content providers to use in-memory data to implement
ContentProvider.openAssetFile(), instead of just normal files
and sockets as before.

To test cross-process use of AssetFileDescriptors for MemoryFiles,
a test content provider and a client for it are added to
AndroidTests.

Fixes http://b/issue?id=1871731
This commit is contained in:
Bjorn Bringert
2009-05-29 14:05:12 +01:00
parent 8dbe612dc6
commit 963cd006c4
7 changed files with 575 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

88
core/java/android/content/res/AssetFileDescriptor.java
View File

@@ -16,6 +16,7 @@
package android.content.res;
import android.os.MemoryFile;
import android.os.Parcel;
import android.os.ParcelFileDescriptor;
import android.os.Parcelable;
@@ -24,6 +25,8 @@ import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.channels.FileChannel;
/**
* File descriptor of an entry in the AssetManager. This provides your own
@@ -123,6 +126,13 @@ public class AssetFileDescriptor implements Parcelable {
mFd.close();
}
/**
* Checks whether this file descriptor is for a memory file.
*/
private boolean isMemoryFile() throws IOException {
return MemoryFile.isMemoryFile(mFd.getFileDescriptor());
}
/**
* Create and return a new auto-close input stream for this asset. This
* will either return a full asset {@link AutoCloseInputStream}, or
@@ -132,6 +142,12 @@ public class AssetFileDescriptor implements Parcelable {
* should only call this once for a particular asset.
*/
public FileInputStream createInputStream() throws IOException {
if (isMemoryFile()) {
if (mLength > Integer.MAX_VALUE) {
throw new IOException("File length too large for a memory file: " + mLength);
}
return new AutoCloseMemoryFileInputStream(mFd, (int)mLength);
}
if (mLength < 0) {
return new ParcelFileDescriptor.AutoCloseInputStream(mFd);
}
@@ -261,6 +277,66 @@ public class AssetFileDescriptor implements Parcelable {
}
}
/**
* An input stream that reads from a MemoryFile and closes it when the stream is closed.
* This extends FileInputStream just because {@link #createInputStream} returns
* a FileInputStream. All the FileInputStream methods are
* overridden to use the MemoryFile instead.
*/
private static class AutoCloseMemoryFileInputStream extends FileInputStream {
private ParcelFileDescriptor mParcelFd;
private MemoryFile mFile;
private InputStream mStream;
public AutoCloseMemoryFileInputStream(ParcelFileDescriptor fd, int length)
throws IOException {
super(fd.getFileDescriptor());
mParcelFd = fd;
mFile = new MemoryFile(fd.getFileDescriptor(), length, "r");
mStream = mFile.getInputStream();
}
@Override
public int available() throws IOException {
return mStream.available();
}
@Override
public void close() throws IOException {
mParcelFd.close(); // must close ParcelFileDescriptor, not just the file descriptor,
// since it could be a subclass of ParcelFileDescriptor.
// E.g. ContentResolver.ParcelFileDescriptorInner.close() releases
// a content provider
mFile.close(); // to unmap the memory file from the address space.
mStream.close(); // doesn't actually do anything
}
@Override
public FileChannel getChannel() {
return null;
}
@Override
public int read() throws IOException {
return mStream.read();
}
@Override
public int read(byte[] buffer, int offset, int count) throws IOException {
return mStream.read(buffer, offset, count);
}
@Override
public int read(byte[] buffer) throws IOException {
return mStream.read(buffer);
}
@Override
public long skip(long count) throws IOException {
return mStream.skip(count);
}
}
/**
* An OutputStream you can create on a ParcelFileDescriptor, which will
* take care of calling {@link ParcelFileDescriptor#close
@@ -345,4 +421,16 @@ public class AssetFileDescriptor implements Parcelable {
return new AssetFileDescriptor[size];
}
};
/**
* Creates an AssetFileDescriptor from a memory file.
*
* @hide
*/
public static AssetFileDescriptor fromMemoryFile(MemoryFile memoryFile)
throws IOException {
ParcelFileDescriptor fd = memoryFile.getParcelFileDescriptor();
return new AssetFileDescriptor(fd, 0, memoryFile.length());
}
}

117
core/java/android/os/MemoryFile.java
View File

@@ -37,9 +37,14 @@ public class MemoryFile
{
private static String TAG = "MemoryFile";
// mmap(2) protection flags from <sys/mman.h>
private static final int PROT_READ = 0x1;
private static final int PROT_WRITE = 0x2;
private static native FileDescriptor native_open(String name, int length) throws IOException;
// returns memory address for ashmem region
private static native int native_mmap(FileDescriptor fd, int length) throws IOException;
private static native int native_mmap(FileDescriptor fd, int length, int mode)
throws IOException;
private static native void native_munmap(int addr, int length) throws IOException;
private static native void native_close(FileDescriptor fd);
private static native int native_read(FileDescriptor fd, int address, byte[] buffer,
@@ -47,14 +52,16 @@ public class MemoryFile
private static native void native_write(FileDescriptor fd, int address, byte[] buffer,
int srcOffset, int destOffset, int count, boolean isUnpinned) throws IOException;
private static native void native_pin(FileDescriptor fd, boolean pin) throws IOException;
private static native boolean native_is_ashmem_region(FileDescriptor fd) throws IOException;
private FileDescriptor mFD; // ashmem file descriptor
private int mAddress; // address of ashmem memory
private int mLength; // total length of our ashmem region
private boolean mAllowPurging = false; // true if our ashmem region is unpinned
private final boolean mOwnsRegion; // false if this is a ref to an existing ashmem region
/**
* MemoryFile constructor.
* Allocates a new ashmem region. The region is initially not purgable.
*
* @param name optional name for the file (can be null).
* @param length of the memory file in bytes.
@@ -63,11 +70,43 @@ public class MemoryFile
public MemoryFile(String name, int length) throws IOException {
mLength = length;
mFD = native_open(name, length);
mAddress = native_mmap(mFD, length);
mAddress = native_mmap(mFD, length, PROT_READ | PROT_WRITE);
mOwnsRegion = true;
}
/**
* Closes and releases all resources for the memory file.
* Creates a reference to an existing memory file. Changes to the original file
* will be available through this reference.
* Calls to {@link #allowPurging(boolean)} on the returned MemoryFile will fail.
*
* @param fd File descriptor for an existing memory file, as returned by
* {@link #getFileDescriptor()}. This file descriptor will be closed
* by {@link #close()}.
* @param length Length of the memory file in bytes.
* @param mode File mode. Currently only "r" for read-only access is supported.
* @throws NullPointerException if <code>fd</code> is null.
* @throws IOException If <code>fd</code> does not refer to an existing memory file,
* or if the file mode of the existing memory file is more restrictive
* than <code>mode</code>.
*
* @hide
*/
public MemoryFile(FileDescriptor fd, int length, String mode) throws IOException {
if (fd == null) {
throw new NullPointerException("File descriptor is null.");
}
if (!isMemoryFile(fd)) {
throw new IllegalArgumentException("Not a memory file.");
}
mLength = length;
mFD = fd;
mAddress = native_mmap(mFD, length, modeToProt(mode));
mOwnsRegion = false;
}
/**
* Closes the memory file. If there are no other open references to the memory
* file, it will be deleted.
*/
public void close() {
deactivate();
@@ -76,7 +115,14 @@ public class MemoryFile
}
}
private void deactivate() {
/**
* Unmaps the memory file from the process's memory space, but does not close it.
* After this method has been called, read and write operations through this object
* will fail, but {@link #getFileDescriptor()} will still return a valid file descriptor.
*
* @hide
*/
public void deactivate() {
if (!isDeactivated()) {
try {
native_munmap(mAddress, mLength);
@@ -135,6 +181,9 @@ public class MemoryFile
* @return previous value of allowPurging
*/
synchronized public boolean allowPurging(boolean allowPurging) throws IOException {
if (!mOwnsRegion) {
throw new IOException("Only the owner can make ashmem regions purgable.");
}
boolean oldValue = mAllowPurging;
if (oldValue != allowPurging) {
native_pin(mFD, !allowPurging);
@@ -210,6 +259,64 @@ public class MemoryFile
native_write(mFD, mAddress, buffer, srcOffset, destOffset, count, mAllowPurging);
}
/**
* Gets a ParcelFileDescriptor for the memory file. See {@link #getFileDescriptor()}
* for caveats. This must be here to allow classes outside <code>android.os</code< to
* make ParcelFileDescriptors from MemoryFiles, as
* {@link ParcelFileDescriptor#ParcelFileDescriptor(FileDescriptor)} is package private.
*
*
* @return The file descriptor owned by this memory file object.
* The file descriptor is not duplicated.
* @throws IOException If the memory file has been closed.
*
* @hide
*/
public ParcelFileDescriptor getParcelFileDescriptor() throws IOException {
return new ParcelFileDescriptor(getFileDescriptor());
}
/**
* Gets a FileDescriptor for the memory file. Note that this file descriptor
* is only safe to pass to {@link #MemoryFile(FileDescriptor,int)}). It
* should not be used with file descriptor operations that expect a file descriptor
* for a normal file.
*
* The returned file descriptor is not duplicated.
*
* @throws IOException If the memory file has been closed.
*
* @hide
*/
public FileDescriptor getFileDescriptor() throws IOException {
return mFD;
}
/**
* Checks whether the given file descriptor refers to a memory file.
*
* @throws IOException If <code>fd</code> is not a valid file descriptor.
*
* @hide
*/
public static boolean isMemoryFile(FileDescriptor fd) throws IOException {
return native_is_ashmem_region(fd);
}
/**
* Converts a file mode string to a <code>prot</code> value as expected by
* native_mmap().
*
* @throws IllegalArgumentException if the file mode is invalid.
*/
private static int modeToProt(String mode) {
if ("r".equals(mode)) {
return PROT_READ;
} else {
throw new IllegalArgumentException("Unsupported file mode: '" + mode + "'");
}
}
private class MemoryInputStream extends InputStream {
private int mMark = 0;

30
core/jni/android_os_MemoryFile.cpp
View File

@@ -39,17 +39,17 @@ static jobject android_os_MemoryFile_open(JNIEnv* env, jobject clazz, jstring na
if (result < 0) {
jniThrowException(env, "java/io/IOException", "ashmem_create_region failed");
return NULL;
return NULL;
}
return jniCreateFileDescriptor(env, result);
}
static jint android_os_MemoryFile_mmap(JNIEnv* env, jobject clazz, jobject fileDescriptor,
jint length)
jint length, jint prot)
{
int fd = jniGetFDFromFileDescriptor(env, fileDescriptor);
jint result = (jint)mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
jint result = (jint)mmap(NULL, length, prot, MAP_SHARED, fd, 0);
if (!result)
jniThrowException(env, "java/io/IOException", "mmap failed");
return result;
@@ -118,14 +118,36 @@ static void android_os_MemoryFile_pin(JNIEnv* env, jobject clazz, jobject fileDe
}
}
static jboolean android_os_MemoryFile_is_ashmem_region(JNIEnv* env, jobject clazz,
jobject fileDescriptor) {
int fd = jniGetFDFromFileDescriptor(env, fileDescriptor);
// Use ASHMEM_GET_SIZE to find out if the fd refers to an ashmem region.
// ASHMEM_GET_SIZE should succeed for all ashmem regions, and the kernel
// should return ENOTTY for all other valid file descriptors
int result = ashmem_get_size_region(fd);
if (result < 0) {
if (errno == ENOTTY) {
// ENOTTY means that the ioctl does not apply to this object,
// i.e., it is not an ashmem region.
return JNI_FALSE;
}
// Some other error, throw exception
jniThrowIOException(env, errno);
return JNI_FALSE;
}
return JNI_TRUE;
}
static const JNINativeMethod methods[] = {
{"native_open", "(Ljava/lang/String;I)Ljava/io/FileDescriptor;", (void*)android_os_MemoryFile_open},
{"native_mmap", "(Ljava/io/FileDescriptor;I)I", (void*)android_os_MemoryFile_mmap},
{"native_mmap", "(Ljava/io/FileDescriptor;II)I", (void*)android_os_MemoryFile_mmap},
{"native_munmap", "(II)V", (void*)android_os_MemoryFile_munmap},
{"native_close", "(Ljava/io/FileDescriptor;)V", (void*)android_os_MemoryFile_close},
{"native_read", "(Ljava/io/FileDescriptor;I[BIIIZ)I", (void*)android_os_MemoryFile_read},
{"native_write", "(Ljava/io/FileDescriptor;I[BIIIZ)V", (void*)android_os_MemoryFile_write},
{"native_pin", "(Ljava/io/FileDescriptor;Z)V", (void*)android_os_MemoryFile_pin},
{"native_is_ashmem_region", "(Ljava/io/FileDescriptor;)Z",
(void*)android_os_MemoryFile_is_ashmem_region}
};
static const char* const kClassPathName = "android/os/MemoryFile";

6
tests/AndroidTests/AndroidManifest.xml
View File

@@ -206,6 +206,12 @@
<meta-data android:name="com.android.unit_tests.reference" android:resource="@xml/metadata" />
</provider>
<!-- Application components used for content tests -->
<provider android:name=".content.MemoryFileProvider"
android:authorities="com.android.unit_tests.content.MemoryFileProvider"
android:process=":MemoryFileProvider">
</provider>
<!-- Application components used for os tests -->
<service android:name=".os.MessengerService"

211
tests/AndroidTests/src/com/android/unit_tests/content/MemoryFileProvider.java Normal file
View File

@@ -0,0 +1,211 @@
/*
* Copyright (C) 2009 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.unit_tests.content;
import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.content.res.AssetFileDescriptor;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.Uri;
import android.os.MemoryFile;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
/** Simple test provider that runs in the local process. */
public class MemoryFileProvider extends ContentProvider {
private static final String TAG = "MemoryFileProvider";
private static final String DATA_FILE = "data.bin";
// some random data
public static final byte[] TEST_BLOB = new byte[] {
-12, 127, 0, 3, 1, 2, 3, 4, 5, 6, 1, -128, -1, -54, -65, 35,
-53, -96, -74, -74, -55, -43, -69, 3, 52, -58,
-121, 127, 87, -73, 16, -13, -103, -65, -128, -36,
107, 24, 118, -17, 97, 97, -88, 19, -94, -54,
53, 43, 44, -27, -124, 28, -74, 26, 35, -36,
16, -124, -31, -31, -128, -79, 108, 116, 43, -17 };
private SQLiteOpenHelper mOpenHelper;
private static final int DATA_ID_BLOB = 1;
private static final int HUGE = 2;
private static final int FILE = 3;
private static final UriMatcher sURLMatcher = new UriMatcher(
UriMatcher.NO_MATCH);
static {
sURLMatcher.addURI("*", "data/#/blob", DATA_ID_BLOB);
sURLMatcher.addURI("*", "huge", HUGE);
sURLMatcher.addURI("*", "file", FILE);
}
private static class DatabaseHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "local.db";
private static final int DATABASE_VERSION = 1;
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE data (" +
"_id INTEGER PRIMARY KEY," +
"_blob TEXT, " +
"integer INTEGER);");
// insert alarms
ContentValues values = new ContentValues();
values.put("_id", 1);
values.put("_blob", TEST_BLOB);
values.put("integer", 100);
db.insert("data", null, values);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int currentVersion) {
Log.w(TAG, "Upgrading test database from version " +
oldVersion + " to " + currentVersion +
", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS data");
onCreate(db);
}
}
public MemoryFileProvider() {
}
@Override
public boolean onCreate() {
mOpenHelper = new DatabaseHelper(getContext());
try {
OutputStream out = getContext().openFileOutput(DATA_FILE, Context.MODE_PRIVATE);
out.write(TEST_BLOB);
out.close();
} catch (IOException ex) {
ex.printStackTrace();
}
return true;
}
@Override
public Cursor query(Uri url, String[] projectionIn, String selection,
String[] selectionArgs, String sort) {
throw new UnsupportedOperationException("query not supported");
}
@Override
public String getType(Uri url) {
int match = sURLMatcher.match(url);
switch (match) {
case DATA_ID_BLOB:
return "application/octet-stream";
case FILE:
return "application/octet-stream";
default:
throw new IllegalArgumentException("Unknown URL");
}
}
@Override
public AssetFileDescriptor openAssetFile(Uri url, String mode) throws FileNotFoundException {
int match = sURLMatcher.match(url);
switch (match) {
case DATA_ID_BLOB:
String sql = "SELECT _blob FROM data WHERE _id=" + url.getPathSegments().get(1);
return getBlobColumnAsAssetFile(url, mode, sql);
case HUGE:
try {
MemoryFile memoryFile = new MemoryFile(null, 5000000);
memoryFile.writeBytes(TEST_BLOB, 0, 1000000, TEST_BLOB.length);
memoryFile.deactivate();
return AssetFileDescriptor.fromMemoryFile(memoryFile);
} catch (IOException ex) {
throw new FileNotFoundException("Error reading " + url + ":" + ex.toString());
}
case FILE:
File file = getContext().getFileStreamPath(DATA_FILE);
ParcelFileDescriptor fd =
ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
return new AssetFileDescriptor(fd, 0, AssetFileDescriptor.UNKNOWN_LENGTH);
default:
throw new FileNotFoundException("No files supported by provider at " + url);
}
}
private AssetFileDescriptor getBlobColumnAsAssetFile(Uri url, String mode, String sql)
throws FileNotFoundException {
if (!"r".equals(mode)) {
throw new FileNotFoundException("Mode " + mode + " not supported for " + url);
}
try {
SQLiteDatabase db = mOpenHelper.getReadableDatabase();
MemoryFile file = simpleQueryForBlobMemoryFile(db, sql);
if (file == null) throw new FileNotFoundException("No such entry: " + url);
AssetFileDescriptor afd = AssetFileDescriptor.fromMemoryFile(file);
file.deactivate();
// need to dup and then close? openFileHelper() doesn't do that though
return afd;
} catch (IOException ex) {
throw new FileNotFoundException("Error reading " + url + ":" + ex.toString());
}
}
private MemoryFile simpleQueryForBlobMemoryFile(SQLiteDatabase db, String sql) throws IOException {
Cursor cursor = db.rawQuery(sql, null);
try {
if (!cursor.moveToFirst()) {
return null;
}
byte[] bytes = cursor.getBlob(0);
MemoryFile file = new MemoryFile(null, bytes.length);
file.writeBytes(bytes, 0, 0, bytes.length);
return file;
} finally {
if (cursor != null) {
cursor.close();
}
}
}
@Override
public int update(Uri url, ContentValues values, String where, String[] whereArgs) {
throw new UnsupportedOperationException("update not supported");
}
@Override
public Uri insert(Uri url, ContentValues initialValues) {
throw new UnsupportedOperationException("insert not supported");
}
@Override
public int delete(Uri url, String where, String[] whereArgs) {
throw new UnsupportedOperationException("delete not supported");
}
}

83
tests/AndroidTests/src/com/android/unit_tests/content/MemoryFileProviderTest.java Normal file
View File

@@ -0,0 +1,83 @@
/*
* Copyright (C) 2009 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.unit_tests.content;
import android.content.ContentResolver;
import android.net.Uri;
import android.test.AndroidTestCase;
import android.test.suitebuilder.annotation.MediumTest;
import java.io.InputStream;
import java.util.Arrays;
/**
* Tests reading a MemoryFile-based AssestFile from a ContentProvider running
* in a different process.
*/
public class MemoryFileProviderTest extends AndroidTestCase {
// reads from a cross-process AssetFileDescriptor for a MemoryFile
@MediumTest
public void testRead() throws Exception {
ContentResolver resolver = getContext().getContentResolver();
Uri uri = Uri.parse("content://com.android.unit_tests.content.MemoryFileProvider/data/1/blob");
byte[] buf = new byte[MemoryFileProvider.TEST_BLOB.length];
InputStream in = resolver.openInputStream(uri);
assertNotNull(in);
int count = in.read(buf);
assertEquals(buf.length, count);
// TODO: MemoryFile throws IndexOutOfBoundsException for this, http://b/issue?id=1881894
//assertEquals(-1, in.read());
in.close();
assertTrue(Arrays.equals(MemoryFileProvider.TEST_BLOB, buf));
}
// tests that we don't leak file descriptors or virtual address space
@MediumTest
public void testClose() throws Exception {
ContentResolver resolver = getContext().getContentResolver();
// open enough file descriptors that we will crash something if we leak FDs
// or address space
for (int i = 0; i < 1025; i++) {
Uri uri = Uri.parse("content://com.android.unit_tests.content.MemoryFileProvider/huge");
InputStream in = resolver.openInputStream(uri);
assertNotNull("Failed to open stream number " + i, in);
assertEquals(1000000, in.skip(1000000));
byte[] buf = new byte[MemoryFileProvider.TEST_BLOB.length];
int count = in.read(buf);
assertEquals(buf.length, count);
assertTrue(Arrays.equals(MemoryFileProvider.TEST_BLOB, buf));
in.close();
}
}
// tests that we haven't broken AssestFileDescriptors for normal files.
@MediumTest
public void testFile() throws Exception {
ContentResolver resolver = getContext().getContentResolver();
Uri uri = Uri.parse("content://com.android.unit_tests.content.MemoryFileProvider/file");
byte[] buf = new byte[MemoryFileProvider.TEST_BLOB.length];
InputStream in = resolver.openInputStream(uri);
assertNotNull(in);
int count = in.read(buf);
assertEquals(buf.length, count);
assertEquals(-1, in.read());
in.close();
assertTrue(Arrays.equals(MemoryFileProvider.TEST_BLOB, buf));
}
}

52
tests/AndroidTests/src/com/android/unit_tests/os/MemoryFileTest.java
View File

@@ -17,19 +17,21 @@
package com.android.unit_tests.os;
import android.os.MemoryFile;
import android.test.AndroidTestCase;
import android.test.suitebuilder.annotation.LargeTest;
import android.test.suitebuilder.annotation.MediumTest;
import android.test.suitebuilder.annotation.SmallTest;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import junit.framework.TestCase;
public class MemoryFileTest extends TestCase {
public class MemoryFileTest extends AndroidTestCase {
private void compareBuffers(byte[] buffer1, byte[] buffer2, int length) throws Exception {
for (int i = 0; i < length; i++) {
@@ -163,6 +165,50 @@ public class MemoryFileTest extends TestCase {
}
}
@SmallTest
public void testIsMemoryFile() throws Exception {
MemoryFile file = new MemoryFile("MemoryFileTest", 1000000);
FileDescriptor fd = file.getFileDescriptor();
assertNotNull(fd);
assertTrue(fd.valid());
assertTrue(MemoryFile.isMemoryFile(fd));
file.close();
assertFalse(MemoryFile.isMemoryFile(FileDescriptor.in));
assertFalse(MemoryFile.isMemoryFile(FileDescriptor.out));
assertFalse(MemoryFile.isMemoryFile(FileDescriptor.err));
File tempFile = File.createTempFile("MemoryFileTest",".tmp", getContext().getFilesDir());
assertNotNull(file);
FileOutputStream out = null;
try {
out = new FileOutputStream(tempFile);
FileDescriptor fileFd = out.getFD();
assertNotNull(fileFd);
assertFalse(MemoryFile.isMemoryFile(fileFd));
} finally {
if (out != null) {
out.close();
}
tempFile.delete();
}
}
public void testFileDescriptor() throws Exception {
MemoryFile file = new MemoryFile("MemoryFileTest", 1000000);
MemoryFile ref = new MemoryFile(file.getFileDescriptor(), file.length(), "r");
byte[] buffer;
// write to original, read from reference
file.writeBytes(testString, 0, 2000, testString.length);
buffer = new byte[testString.length];
ref.readBytes(buffer, 2000, 0, testString.length);
compareBuffers(testString, buffer, testString.length);
file.close();
ref.close(); // Doesn't actually do anything, since the file descriptor is not dup(2):ed
}
private static final byte[] testString = new byte[] {
3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 8, 9, 7, 9, 3, 2, 3, 8, 4, 6, 2, 6, 4, 3, 3, 8, 3, 2, 7, 9, 5, 0, 2, 8, 8, 4, 1, 9, 7, 1, 6, 9, 3, 9, 9, 3, 7, 5, 1, 0, 5, 8, 2, 0, 9, 7, 4, 9, 4, 4, 5, 9, 2, 3, 0, 7, 8, 1, 6, 4,
0, 6, 2, 8, 6, 2, 0, 8, 9, 9, 8, 6, 2, 8, 0, 3, 4, 8, 2, 5, 3, 4, 2, 1, 1, 7, 0, 6, 7, 9, 8, 2, 1, 4, 8, 0, 8, 6, 5, 1, 3, 2, 8, 2, 3, 0, 6, 6, 4, 7, 0, 9, 3, 8, 4, 4, 6, 0, 9, 5, 5, 0, 5, 8, 2, 2, 3, 1, 7, 2,