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/*
* Copyright (C) 2010 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.gallery3d.data;
import com.android.gallery3d.common.BlobCache;
import com.android.gallery3d.common.Utils;
import com.android.gallery3d.util.CacheManager;
import com.android.gallery3d.util.GalleryUtils;
import android.content.Context;
import java.io.IOException;
import java.nio.ByteBuffer;
public class ImageCacheService {
@SuppressWarnings("unused")
private static final String TAG = "ImageCacheService";
private static final String IMAGE_CACHE_FILE = "imgcache";
private static final int IMAGE_CACHE_MAX_ENTRIES = 5000;
private static final int IMAGE_CACHE_MAX_BYTES = 200 * 1024 * 1024;
private static final int IMAGE_CACHE_VERSION = 3;
private BlobCache mCache;
public ImageCacheService(Context context) {
mCache = CacheManager.getCache(context, IMAGE_CACHE_FILE,
IMAGE_CACHE_MAX_ENTRIES, IMAGE_CACHE_MAX_BYTES,
IMAGE_CACHE_VERSION);
}
public static class ImageData {
public ImageData(byte[] data, int offset) {
mData = data;
mOffset = offset;
}
public byte[] mData;
public int mOffset;
}
public ImageData getImageData(Path path, int type) {
byte[] key = makeKey(path, type);
long cacheKey = Utils.crc64Long(key);
try {
byte[] value = null;
synchronized (mCache) {
value = mCache.lookup(cacheKey);
}
if (value == null) return null;
if (isSameKey(key, value)) {
int offset = key.length;
return new ImageData(value, offset);
}
} catch (IOException ex) {
// ignore.
}
return null;
}
public void putImageData(Path path, int type, byte[] value) {
byte[] key = makeKey(path, type);
long cacheKey = Utils.crc64Long(key);
ByteBuffer buffer = ByteBuffer.allocate(key.length + value.length);
buffer.put(key);
buffer.put(value);
synchronized (mCache) {
try {
mCache.insert(cacheKey, buffer.array());
} catch (IOException ex) {
// ignore.
}
}
}
private static byte[] makeKey(Path path, int type) {
return GalleryUtils.getBytes(path.toString() + "+" + type);
}
private static boolean isSameKey(byte[] key, byte[] buffer) {
int n = key.length;
if (buffer.length < n) {
return false;
}
for (int i = 0; i < n; ++i) {
if (key[i] != buffer[i]) {
return false;
}
}
return true;
}
}
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