core/core/src/main/java/androidx/core/graphics/TypefaceCompatUtil.java - platform/frameworks/support - Git at Google

 /*
  * Copyright (C) 2017 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.core.graphics;

 import static androidx.annotation.RestrictTo.Scope.LIBRARY;
 import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP_PREFIX;

 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.res.Resources;
 import android.net.Uri;
 import android.os.CancellationSignal;
 import android.os.ParcelFileDescriptor;
 import android.os.Process;
 import android.os.StrictMode;
 import android.util.Log;

 import androidx.annotation.DoNotInline;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 import androidx.annotation.RestrictTo;
 import androidx.core.provider.FontsContractCompat;

 import java.io.Closeable;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;

 /**
  * Utility methods for TypefaceCompat.
  * @hide
  */
 @RestrictTo(LIBRARY_GROUP_PREFIX)
 public class TypefaceCompatUtil {
  private static final String TAG = "TypefaceCompatUtil";

  private TypefaceCompatUtil() {} // Do not instantiate.

  private static final String CACHE_FILE_PREFIX = ".font";

  /**
  * Creates a temp file.
  *
  * Returns null if failed to create temp file.
  */
  @Nullable
  public static File getTempFile(@NonNull Context context) {
  File cacheDir = context.getCacheDir();
  if (cacheDir == null) {
  return null;
  }

  final String prefix = CACHE_FILE_PREFIX + Process.myPid() + "-" + Process.myTid() + "-";
  for (int i = 0; i < 100; ++i) {
  final File file = new File(cacheDir, prefix + i);
  try {
  if (file.createNewFile()) {
  return file;
  }
  } catch (IOException e) {
  // ignore. Try next file.
  }
  }
  return null;
  }

  /**
  * Copy the file contents to the direct byte buffer.
  */
  @Nullable
  @RequiresApi(19)
  private static ByteBuffer mmap(File file) {
  try (FileInputStream fis = new FileInputStream(file)) {
  FileChannel channel = fis.getChannel();
  final long size = channel.size();
  return channel.map(FileChannel.MapMode.READ_ONLY, 0, size);
  } catch (IOException e) {
  return null;
  }
  }

  /**
  * Copy the file contents to the direct byte buffer.
  */
  @Nullable
  @RequiresApi(19)
  public static ByteBuffer mmap(@NonNull Context context,
  @Nullable CancellationSignal cancellationSignal, @NonNull Uri uri) {
  final ContentResolver resolver = context.getContentResolver();
  try (ParcelFileDescriptor pfd = Api19Impl.openFileDescriptor(resolver, uri, "r",
  cancellationSignal)) {
  if (pfd == null) {
  return null;
  }
  try (FileInputStream fis = new FileInputStream(pfd.getFileDescriptor())) {
  FileChannel channel = fis.getChannel();
  final long size = channel.size();
  return channel.map(FileChannel.MapMode.READ_ONLY, 0, size);
  }
  } catch (IOException e) {
  return null;
  }
  }

  /**
  * Copy the resource contents to the direct byte buffer.
  */
  @SuppressWarnings("ResultOfMethodCallIgnored")
  @Nullable
  @RequiresApi(19)
  public static ByteBuffer copyToDirectBuffer(@NonNull Context context, @NonNull Resources res,
  int id) {
  File tmpFile = getTempFile(context);
  if (tmpFile == null) {
  return null;
  }
  try {
  if (!copyToFile(tmpFile, res, id)) {
  return null;
  }
  return mmap(tmpFile);
  } finally {
  tmpFile.delete();
  }
  }

  /**
  * Copy the input stream contents to file.
  */
  public static boolean copyToFile(@NonNull File file, @NonNull InputStream is) {
  FileOutputStream os = null;
  StrictMode.ThreadPolicy old = StrictMode.allowThreadDiskWrites();
  try {
  os = new FileOutputStream(file, false);
  byte[] buffer = new byte[1024];
  int readLen;
  while ((readLen = is.read(buffer)) != -1) {
  os.write(buffer, 0, readLen);
  }
  return true;
  } catch (IOException e) {
  Log.e(TAG, "Error copying resource contents to temp file: " + e.getMessage());
  return false;
  } finally {
  closeQuietly(os);
  StrictMode.setThreadPolicy(old);
  }
  }

  /**
  * Copy the resource contents to file.
  */
  @SuppressWarnings("BooleanMethodIsAlwaysInverted")
  public static boolean copyToFile(@NonNull File file, @NonNull Resources res, int id) {
  InputStream is = null;
  try {
  is = res.openRawResource(id);
  return copyToFile(file, is);
  } finally {
  closeQuietly(is);
  }
  }

  /**
  * Attempts to close a Closeable, swallowing any resulting IOException.
  *
  * @param c the closeable to close
  */
  public static void closeQuietly(@Nullable Closeable c) {
  if (c != null) {
  try {
  c.close();
  } catch (IOException e) {
  // Quietly!
  }
  }
  }

  /**
  * A helper function to create a mapping from {@link Uri} to {@link ByteBuffer}.
  *
  * Skip if the file contents is not ready to be read.
  *
  * @param context A {@link Context} to be used for resolving content URI in
  * {@link FontsContractCompat.FontInfo}.
  * @param fonts An array of {@link FontsContractCompat.FontInfo}.
  * @return A map from {@link Uri} to {@link ByteBuffer}.
  * @hide
  */
  @RestrictTo(LIBRARY)
  @NonNull
  @RequiresApi(19)
  public static Map<Uri, ByteBuffer> readFontInfoIntoByteBuffer(
  @NonNull Context context,
  @NonNull FontsContractCompat.FontInfo[] fonts,
  @Nullable CancellationSignal cancellationSignal
  ) {
  final HashMap<Uri, ByteBuffer> out = new HashMap<>();

  for (FontsContractCompat.FontInfo font : fonts) {
  if (font.getResultCode() != FontsContractCompat.Columns.RESULT_CODE_OK) {
  continue;
  }

  final Uri uri = font.getUri();
  if (out.containsKey(uri)) {
  continue;
  }

  ByteBuffer buffer = TypefaceCompatUtil.mmap(context, cancellationSignal, uri);
  out.put(uri, buffer);
  }
  return Collections.unmodifiableMap(out);
  }

  @RequiresApi(19)
  static class Api19Impl {
  private Api19Impl() {
  // This class is not instantiable.
  }

  @SuppressWarnings("SameParameterValue")
  @DoNotInline
  static ParcelFileDescriptor openFileDescriptor(ContentResolver contentResolver, Uri uri,
  String mode, CancellationSignal cancellationSignal) throws FileNotFoundException {
  return contentResolver.openFileDescriptor(uri, mode, cancellationSignal);
  }
  }
 }
	/*
	* Copyright (C) 2017 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.core.graphics;

	import static androidx.annotation.RestrictTo.Scope.LIBRARY;
	import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP_PREFIX;

	import android.content.ContentResolver;
	import android.content.Context;
	import android.content.res.Resources;
	import android.net.Uri;
	import android.os.CancellationSignal;
	import android.os.ParcelFileDescriptor;
	import android.os.Process;
	import android.os.StrictMode;
	import android.util.Log;

	import androidx.annotation.DoNotInline;
	import androidx.annotation.NonNull;
	import androidx.annotation.Nullable;
	import androidx.annotation.RequiresApi;
	import androidx.annotation.RestrictTo;
	import androidx.core.provider.FontsContractCompat;

	import java.io.Closeable;
	import java.io.File;
	import java.io.FileInputStream;
	import java.io.FileNotFoundException;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.io.InputStream;
	import java.nio.ByteBuffer;
	import java.nio.channels.FileChannel;
	import java.util.Collections;
	import java.util.HashMap;
	import java.util.Map;

	/**
	* Utility methods for TypefaceCompat.
	* @hide
	*/
	@RestrictTo(LIBRARY_GROUP_PREFIX)
	public class TypefaceCompatUtil {
	private static final String TAG = "TypefaceCompatUtil";

	private TypefaceCompatUtil() {} // Do not instantiate.

	private static final String CACHE_FILE_PREFIX = ".font";

	/**
	* Creates a temp file.
	*
	* Returns null if failed to create temp file.
	*/
	@Nullable
	public static File getTempFile(@NonNull Context context) {
	File cacheDir = context.getCacheDir();
	if (cacheDir == null) {
	return null;
	}

	final String prefix = CACHE_FILE_PREFIX + Process.myPid() + "-" + Process.myTid() + "-";
	for (int i = 0; i < 100; ++i) {
	final File file = new File(cacheDir, prefix + i);
	try {
	if (file.createNewFile()) {
	return file;
	}
	} catch (IOException e) {
	// ignore. Try next file.
	}
	}
	return null;
	}

	/**
	* Copy the file contents to the direct byte buffer.
	*/
	@Nullable
	@RequiresApi(19)
	private static ByteBuffer mmap(File file) {
	try (FileInputStream fis = new FileInputStream(file)) {
	FileChannel channel = fis.getChannel();
	final long size = channel.size();
	return channel.map(FileChannel.MapMode.READ_ONLY, 0, size);
	} catch (IOException e) {
	return null;
	}
	}

	/**
	* Copy the file contents to the direct byte buffer.
	*/
	@Nullable
	@RequiresApi(19)
	public static ByteBuffer mmap(@NonNull Context context,
	@Nullable CancellationSignal cancellationSignal, @NonNull Uri uri) {
	final ContentResolver resolver = context.getContentResolver();
	try (ParcelFileDescriptor pfd = Api19Impl.openFileDescriptor(resolver, uri, "r",
	cancellationSignal)) {
	if (pfd == null) {
	return null;
	}
	try (FileInputStream fis = new FileInputStream(pfd.getFileDescriptor())) {
	FileChannel channel = fis.getChannel();
	final long size = channel.size();
	return channel.map(FileChannel.MapMode.READ_ONLY, 0, size);
	}
	} catch (IOException e) {
	return null;
	}
	}

	/**
	* Copy the resource contents to the direct byte buffer.
	*/
	@SuppressWarnings("ResultOfMethodCallIgnored")
	@Nullable
	@RequiresApi(19)
	public static ByteBuffer copyToDirectBuffer(@NonNull Context context, @NonNull Resources res,
	int id) {
	File tmpFile = getTempFile(context);
	if (tmpFile == null) {
	return null;
	}
	try {
	if (!copyToFile(tmpFile, res, id)) {
	return null;
	}
	return mmap(tmpFile);
	} finally {
	tmpFile.delete();
	}
	}

	/**
	* Copy the input stream contents to file.
	*/
	public static boolean copyToFile(@NonNull File file, @NonNull InputStream is) {
	FileOutputStream os = null;
	StrictMode.ThreadPolicy old = StrictMode.allowThreadDiskWrites();
	try {
	os = new FileOutputStream(file, false);
	byte[] buffer = new byte[1024];
	int readLen;
	while ((readLen = is.read(buffer)) != -1) {
	os.write(buffer, 0, readLen);
	}
	return true;
	} catch (IOException e) {
	Log.e(TAG, "Error copying resource contents to temp file: " + e.getMessage());
	return false;
	} finally {
	closeQuietly(os);
	StrictMode.setThreadPolicy(old);
	}
	}

	/**
	* Copy the resource contents to file.
	*/
	@SuppressWarnings("BooleanMethodIsAlwaysInverted")
	public static boolean copyToFile(@NonNull File file, @NonNull Resources res, int id) {
	InputStream is = null;
	try {
	is = res.openRawResource(id);
	return copyToFile(file, is);
	} finally {
	closeQuietly(is);
	}
	}

	/**
	* Attempts to close a Closeable, swallowing any resulting IOException.
	*
	* @param c the closeable to close
	*/
	public static void closeQuietly(@Nullable Closeable c) {
	if (c != null) {
	try {
	c.close();
	} catch (IOException e) {
	// Quietly!
	}
	}
	}

	/**
	* A helper function to create a mapping from {@link Uri} to {@link ByteBuffer}.
	*
	* Skip if the file contents is not ready to be read.
	*
	* @param context A {@link Context} to be used for resolving content URI in
	* {@link FontsContractCompat.FontInfo}.
	* @param fonts An array of {@link FontsContractCompat.FontInfo}.
	* @return A map from {@link Uri} to {@link ByteBuffer}.
	* @hide
	*/
	@RestrictTo(LIBRARY)
	@NonNull
	@RequiresApi(19)
	public static Map<Uri, ByteBuffer> readFontInfoIntoByteBuffer(
	@NonNull Context context,
	@NonNull FontsContractCompat.FontInfo[] fonts,
	@Nullable CancellationSignal cancellationSignal
	) {
	final HashMap<Uri, ByteBuffer> out = new HashMap<>();

	for (FontsContractCompat.FontInfo font : fonts) {
	if (font.getResultCode() != FontsContractCompat.Columns.RESULT_CODE_OK) {
	continue;
	}

	final Uri uri = font.getUri();
	if (out.containsKey(uri)) {
	continue;
	}

	ByteBuffer buffer = TypefaceCompatUtil.mmap(context, cancellationSignal, uri);
	out.put(uri, buffer);
	}
	return Collections.unmodifiableMap(out);
	}

	@RequiresApi(19)
	static class Api19Impl {
	private Api19Impl() {
	// This class is not instantiable.
	}

	@SuppressWarnings("SameParameterValue")
	@DoNotInline
	static ParcelFileDescriptor openFileDescriptor(ContentResolver contentResolver, Uri uri,
	String mode, CancellationSignal cancellationSignal) throws FileNotFoundException {
	return contentResolver.openFileDescriptor(uri, mode, cancellationSignal);
	}
	}
	}