Merge "Revert "Revert "Have AssetFileDescriptor.AutoCloseInputStream us..."" (2ef3a7eb) · Commits · e / os / android_frameworks_base

core/java/android/content/res/AssetFileDescriptor.java

+70 −63

Original line number	Diff line number	Diff line
		@@ -21,6 +21,8 @@ import android.os.Bundle;
		import android.os.Parcel;
		import android.os.ParcelFileDescriptor;
		import android.os.Parcelable;
		import android.system.ErrnoException;
		import android.system.Os;

		import java.io.Closeable;
		import java.io.FileDescriptor;
		@@ -203,19 +205,24 @@ public class AssetFileDescriptor implements Parcelable, Closeable {
		*/
		public static class AutoCloseInputStream
		extends ParcelFileDescriptor.AutoCloseInputStream {
		private long mRemaining;
		private final long mSizeFromStartOffset;
		private final long mStartOffset;
		private long mPosFromStartOffset;

		public AutoCloseInputStream(AssetFileDescriptor fd) throws IOException {
		super(fd.getParcelFileDescriptor());
		// this skip is necessary if getChannel() is called
		super.skip(fd.getStartOffset());
		mRemaining = (int)fd.getLength();
		mSizeFromStartOffset = fd.getLength();
		mStartOffset = fd.getStartOffset();
		}

		@Override
		public int available() throws IOException {
		return mRemaining >= 0
		? (mRemaining < 0x7fffffff ? (int)mRemaining : 0x7fffffff)
		: super.available();
		long available = mSizeFromStartOffset - mPosFromStartOffset;
		return available >= 0
		? (available < 0x7fffffff ? (int) available : 0x7fffffff)
		: 0;
		}

		@Override
		@@ -227,15 +234,24 @@ public class AssetFileDescriptor implements Parcelable, Closeable {

		@Override
		public int read(byte[] buffer, int offset, int count) throws IOException {
		if (mRemaining >= 0) {
		if (mRemaining == 0) return -1;
		if (count > mRemaining) count = (int)mRemaining;
		int res = super.read(buffer, offset, count);
		if (res >= 0) mRemaining -= res;
		int available = available();

		if (available <= 0) {
		return -1;
		} else {
		if (count > available) count = available;
		try {
		int res = Os.pread(getFD(), buffer, offset, count,
		mStartOffset + mPosFromStartOffset);
		// pread returns 0 at end of file, while java's InputStream interface
		// requires -1
		if (res == 0) res = -1;
		if (res >= 0) mPosFromStartOffset += res;
		return res;
		} catch (ErrnoException e) {
		throw new IOException(e);
		}
		}

		return super.read(buffer, offset, count);
		}

		@Override
		@@ -245,42 +261,32 @@ public class AssetFileDescriptor implements Parcelable, Closeable {

		@Override
		public long skip(long count) throws IOException {
		if (mRemaining >= 0) {
		if (mRemaining == 0) return -1;
		if (count > mRemaining) count = mRemaining;
		long res = super.skip(count);
		if (res >= 0) mRemaining -= res;
		return res;
		int available = available();
		if (available <= 0) {
		return -1;
		} else {
		if (count > available) count = available;
		mPosFromStartOffset += count;
		return count;
		}

		return super.skip(count);
		}

		@Override
		public void mark(int readlimit) {
		if (mRemaining >= 0) {
		// Not supported.
		return;
		}
		super.mark(readlimit);
		}

		@Override
		public boolean markSupported() {
		if (mRemaining >= 0) {
		return false;
		}
		return super.markSupported();
		}

		@Override
		public synchronized void reset() throws IOException {
		if (mRemaining >= 0) {
		// Not supported.
		return;
		}
		super.reset();
		}
		}

		/**
		@@ -375,6 +381,7 @@ public class AssetFileDescriptor implements Parcelable, Closeable {
		public AssetFileDescriptor createFromParcel(Parcel in) {
		return new AssetFileDescriptor(in);
		}

		public AssetFileDescriptor[] newArray(int size) {
		return new AssetFileDescriptor[size];
		}