AssetFileDescriptor.java revision 32559e191fd2580393d77161a32bcaeaa49fbe5d
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.content.res; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.os.Parcel; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.os.ParcelFileDescriptor; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.os.Parcelable; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2332559e191fd2580393d77161a32bcaeaa49fbe5dJeff Sharkeyimport java.io.Closeable; 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.FileDescriptor; 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.FileInputStream; 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.FileOutputStream; 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.IOException; 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * File descriptor of an entry in the AssetManager. This provides your own 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * opened FileDescriptor that can be used to read the data, as well as the 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * offset and length of that entry's data in the file. 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3432559e191fd2580393d77161a32bcaeaa49fbe5dJeff Sharkeypublic class AssetFileDescriptor implements Parcelable, Closeable { 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Length used with {@link #AssetFileDescriptor(ParcelFileDescriptor, long, long)} 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * and {@link #getDeclaredLength} when a length has not been declared. This means 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the data extends to the end of the file. 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final long UNKNOWN_LENGTH = -1; 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final ParcelFileDescriptor mFd; 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final long mStartOffset; 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final long mLength; 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Create a new AssetFileDescriptor from the given values. 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fd The underlying file descriptor. 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param startOffset The location within the file that the asset starts. 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This must be 0 if length is UNKNOWN_LENGTH. 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param length The number of bytes of the asset, or 52a006b47298539d89dc7a06b54c070cb3e986352aBjorn Bringert * {@link #UNKNOWN_LENGTH} if it extends to the end of the file. 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public AssetFileDescriptor(ParcelFileDescriptor fd, long startOffset, 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long length) { 56af67fc65bf113b028ff33e71cd6a45810018c273Jeff Brown if (fd == null) { 57af67fc65bf113b028ff33e71cd6a45810018c273Jeff Brown throw new IllegalArgumentException("fd must not be null"); 58af67fc65bf113b028ff33e71cd6a45810018c273Jeff Brown } 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (length < 0 && startOffset != 0) { 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalArgumentException( 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project "startOffset must be 0 when using UNKNOWN_LENGTH"); 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFd = fd; 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mStartOffset = startOffset; 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLength = length; 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The AssetFileDescriptor contains its own ParcelFileDescriptor, which 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * in addition to the normal FileDescriptor object also allows you to close 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the descriptor when you are done with it. 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ParcelFileDescriptor getParcelFileDescriptor() { 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFd; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the FileDescriptor that can be used to read the data in the 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * file. 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public FileDescriptor getFileDescriptor() { 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFd.getFileDescriptor(); 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the byte offset where this asset entry's data starts. 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long getStartOffset() { 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mStartOffset; 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the total number of bytes of this asset entry's data. May be 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link #UNKNOWN_LENGTH} if the asset extends to the end of the file. 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If the AssetFileDescriptor was constructed with {@link #UNKNOWN_LENGTH}, 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * this will use {@link ParcelFileDescriptor#getStatSize() 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * ParcelFileDescriptor.getStatSize()} to find the total size of the file, 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * returning that number if found or {@link #UNKNOWN_LENGTH} if it could 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * not be determined. 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @see #getDeclaredLength() 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long getLength() { 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mLength >= 0) { 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mLength; 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long len = mFd.getStatSize(); 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return len >= 0 ? len : UNKNOWN_LENGTH; 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Return the actual number of bytes that were declared when the 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * AssetFileDescriptor was constructed. Will be 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link #UNKNOWN_LENGTH} if the length was not declared, meaning data 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * should be read to the end of the file. 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @see #getDeclaredLength() 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long getDeclaredLength() { 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mLength; 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Convenience for calling <code>getParcelFileDescriptor().close()</code>. 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12632559e191fd2580393d77161a32bcaeaa49fbe5dJeff Sharkey @Override 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void close() throws IOException { 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFd.close(); 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 130963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert 131963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert /** 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Create and return a new auto-close input stream for this asset. This 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will either return a full asset {@link AutoCloseInputStream}, or 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an underlying {@link ParcelFileDescriptor.AutoCloseInputStream 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * ParcelFileDescriptor.AutoCloseInputStream} depending on whether the 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the object represents a complete file or sub-section of a file. You 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * should only call this once for a particular asset. 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public FileInputStream createInputStream() throws IOException { 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mLength < 0) { 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new ParcelFileDescriptor.AutoCloseInputStream(mFd); 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new AutoCloseInputStream(this); 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Create and return a new auto-close output stream for this asset. This 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will either return a full asset {@link AutoCloseOutputStream}, or 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an underlying {@link ParcelFileDescriptor.AutoCloseOutputStream 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * ParcelFileDescriptor.AutoCloseOutputStream} depending on whether the 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the object represents a complete file or sub-section of a file. You 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * should only call this once for a particular asset. 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public FileOutputStream createOutputStream() throws IOException { 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mLength < 0) { 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new ParcelFileDescriptor.AutoCloseOutputStream(mFd); 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new AutoCloseOutputStream(this); 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public String toString() { 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return "{AssetFileDescriptor: " + mFd 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + " start=" + mStartOffset + " len=" + mLength + "}"; 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * An InputStream you can create on a ParcelFileDescriptor, which will 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * take care of calling {@link ParcelFileDescriptor#close 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * ParcelFileDescritor.close()} for you when the stream is closed. 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static class AutoCloseInputStream 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project extends ParcelFileDescriptor.AutoCloseInputStream { 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private long mRemaining; 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public AutoCloseInputStream(AssetFileDescriptor fd) throws IOException { 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(fd.getParcelFileDescriptor()); 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.skip(fd.getStartOffset()); 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mRemaining = (int)fd.getLength(); 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int available() throws IOException { 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mRemaining >= 0 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ? (mRemaining < 0x7fffffff ? (int)mRemaining : 0x7fffffff) 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project : super.available(); 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read() throws IOException { 191212799338d7be336e73eb65de3dcd0338a705a11Bjorn Bringert byte[] buffer = new byte[1]; 192212799338d7be336e73eb65de3dcd0338a705a11Bjorn Bringert int result = read(buffer, 0, 1); 193212799338d7be336e73eb65de3dcd0338a705a11Bjorn Bringert return result == -1 ? -1 : buffer[0] & 0xff; 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read(byte[] buffer, int offset, int count) throws IOException { 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining >= 0) { 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining == 0) return -1; 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > mRemaining) count = (int)mRemaining; 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int res = super.read(buffer, offset, count); 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (res >= 0) mRemaining -= res; 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return res; 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return super.read(buffer, offset, count); 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read(byte[] buffer) throws IOException { 211212799338d7be336e73eb65de3dcd0338a705a11Bjorn Bringert return read(buffer, 0, buffer.length); 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long skip(long count) throws IOException { 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining >= 0) { 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining == 0) return -1; 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > mRemaining) count = mRemaining; 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long res = super.skip(count); 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (res >= 0) mRemaining -= res; 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return res; 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return super.skip(count); 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void mark(int readlimit) { 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining >= 0) { 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Not supported. 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.mark(readlimit); 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean markSupported() { 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining >= 0) { 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return super.markSupported(); 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public synchronized void reset() throws IOException { 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining >= 0) { 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Not supported. 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.reset(); 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 253963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert 254963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert /** 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * An OutputStream you can create on a ParcelFileDescriptor, which will 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * take care of calling {@link ParcelFileDescriptor#close 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * ParcelFileDescritor.close()} for you when the stream is closed. 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static class AutoCloseOutputStream 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project extends ParcelFileDescriptor.AutoCloseOutputStream { 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private long mRemaining; 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public AutoCloseOutputStream(AssetFileDescriptor fd) throws IOException { 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(fd.getParcelFileDescriptor()); 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fd.getParcelFileDescriptor().seekTo(fd.getStartOffset()) < 0) { 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IOException("Unable to seek"); 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mRemaining = (int)fd.getLength(); 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void write(byte[] buffer, int offset, int count) throws IOException { 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining >= 0) { 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining == 0) return; 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > mRemaining) count = (int)mRemaining; 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.write(buffer, offset, count); 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mRemaining -= count; 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.write(buffer, offset, count); 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void write(byte[] buffer) throws IOException { 2869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining >= 0) { 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining == 0) return; 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = buffer.length; 2899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > mRemaining) count = (int)mRemaining; 2909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.write(buffer); 2919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mRemaining -= count; 2929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 2939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.write(buffer); 2969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void write(int oneByte) throws IOException { 3009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining >= 0) { 3019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRemaining == 0) return; 3029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.write(oneByte); 3039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mRemaining--; 3049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.write(oneByte); 3089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Parcelable interface */ 3139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int describeContents() { 3149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFd.describeContents(); 3159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void writeToParcel(Parcel out, int flags) { 3189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFd.writeToParcel(out, flags); 3199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.writeLong(mStartOffset); 3209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.writeLong(mLength); 3219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project AssetFileDescriptor(Parcel src) { 3249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFd = ParcelFileDescriptor.CREATOR.createFromParcel(src); 3259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mStartOffset = src.readLong(); 3269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLength = src.readLong(); 3279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final Parcelable.Creator<AssetFileDescriptor> CREATOR 3309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project = new Parcelable.Creator<AssetFileDescriptor>() { 3319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public AssetFileDescriptor createFromParcel(Parcel in) { 3329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new AssetFileDescriptor(in); 3339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public AssetFileDescriptor[] newArray(int size) { 3359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new AssetFileDescriptor[size]; 3369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project }; 338963cd006c45716b034f656bf7e7179e6476f7e4dBjorn Bringert 3399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 340