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AssetManager: use libandroidfw to read assets straight from the apk file

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they can still be put on the filesystem and will be read from there
preferentially, though overriding assets in this way can confuse
some creatively written apps and cause them to crash.
This commit is contained in:
Mis012
2024-05-25 20:43:33 +02:00
parent dd56a2d551
commit 4374ac01ad
8 changed files with 185 additions and 345 deletions
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123
src/api-impl/android/content/res/AssetManager.java
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@@ -17,6 +17,7 @@
package android.content.res;
import android.content.Context;
import android.os.Environment;
import android.os.ParcelFileDescriptor;
import android.util.AttributeSet;
import android.util.Log;
@@ -127,6 +128,7 @@ public final class AssetManager {
} catch (IOException e) {
Log.e(TAG, "failed to load resources.arsc" + e);
}
addAssetPath(android.os.Environment.getExternalStorageDirectory().getAbsolutePath());
}
}
@@ -308,48 +310,12 @@ public final class AssetManager {
* @see #list
*/
public final InputStream open(String fileName, int accessMode) throws IOException {
int asset;
// try loading from filesystem
synchronized (this) {
if (!mOpen) {
throw new RuntimeException("Assetmanager has been closed");
}
asset = openAsset(fileName, accessMode);
if (asset >= 0) {
AssetInputStream res = new AssetInputStream(asset, "/assets/" + fileName);
incRefsLocked(res.hashCode());
return res;
}
}
// alternatively load directly from APK
InputStream ret = ClassLoader.getSystemClassLoader().getResourceAsStream("assets/" + fileName);
if(ret == null)
throw new FileNotFoundException("Asset file: " + fileName + ", errno: " + asset);
return ret;
long asset = openAsset("assets/" + fileName, accessMode);
return new AssetInputStream(asset);
}
public final AssetFileDescriptor openFd(String fileName)
throws IOException {
int asset;
synchronized (this) {
if (!mOpen) {
throw new RuntimeException("Assetmanager has been closed");
}
asset = openAsset(fileName, 0);
if (asset < 0)
throw new FileNotFoundException("Asset file: " + fileName + ", errno: " + asset);
FileDescriptor fd = new FileDescriptor();
fd.setInt$(asset);
ParcelFileDescriptor pfd = new ParcelFileDescriptor(fd);
if (pfd != null) {
AssetFileDescriptor afd = new AssetFileDescriptor(pfd, 0, getAssetLength(asset));
afd.fileName = "/assets/" + fileName;
return afd;
}
}
throw new FileNotFoundException("Asset file: " + fileName);
public final AssetFileDescriptor openFd(String fileName) throws IOException {
return openFd_internal("assets/" + fileName, 0);
}
/**
@@ -415,21 +381,8 @@ public final class AssetManager {
* @param accessMode Desired access mode for retrieving the data.
*/
public final InputStream openNonAsset(int cookie, String fileName, int accessMode) throws IOException {
int asset;
// try loading from filesystem
synchronized (this) {
if (!mOpen) {
throw new RuntimeException("Assetmanager has been closed");
}
asset = openNonAssetNative(cookie, fileName, accessMode);
if (asset >= 0) {
AssetInputStream res = new AssetInputStream(asset, fileName);
incRefsLocked(res.hashCode());
return res;
}
}
// alternatively load directly from APK
return ClassLoader.getSystemClassLoader().getResourceAsStream(fileName);
long asset = openAsset(fileName, accessMode);
return new AssetInputStream(asset);
}
public final AssetFileDescriptor openNonAssetFd(String fileName)
@@ -439,17 +392,33 @@ public final class AssetManager {
public final AssetFileDescriptor openNonAssetFd(int cookie,
String fileName) throws IOException {
return openFd_internal(fileName, 0);
}
private final AssetFileDescriptor openFd_internal(String fileName, int accessMode)
throws IOException {
int asset;
synchronized (this) {
if (!mOpen) {
throw new RuntimeException("Assetmanager has been closed");
}
ParcelFileDescriptor pfd = openNonAssetFdNative(cookie,
fileName, mOffsets);
long[] offset = new long[1];
long[] length = new long[1];
asset = openAssetFd(fileName, accessMode, offset, length);
if (asset < 0)
throw new FileNotFoundException("file: " + fileName + ", error: " + asset);
FileDescriptor fd = new FileDescriptor();
fd.setInt$(asset);
ParcelFileDescriptor pfd = new ParcelFileDescriptor(fd);
if (pfd != null) {
return new AssetFileDescriptor(pfd, mOffsets[0], mOffsets[1]);
AssetFileDescriptor afd = new AssetFileDescriptor(pfd, offset[0], length[0]);
afd.fileName = fileName;
return afd;
}
}
throw new FileNotFoundException("Asset absolute file: " + fileName);
throw new FileNotFoundException("file: " + fileName);
}
/**
@@ -553,13 +522,9 @@ public final class AssetManager {
}
public final class AssetInputStream extends InputStream {
public final int getAssetInt() {
return mAsset;
}
private AssetInputStream(int asset, String fileName) {
private AssetInputStream(long asset) {
mAsset = asset;
mLength = getAssetLength(asset);
this.fileName = fileName;
}
public final int read() throws IOException {
return readAssetChar(mAsset);
@@ -607,10 +572,9 @@ public final class AssetManager {
close();
}
private int mAsset;
private long mAsset;
private long mLength;
private long mMarkPos;
public String fileName;
}
/**
@@ -720,20 +684,15 @@ public final class AssetManager {
/*package*/ native final String getResourceTypeName(int resid);
/*package*/ native final String getResourceEntryName(int resid);
private native final int openAsset(String fileName, int accessMode);
private final native ParcelFileDescriptor openAssetFd(String fileName,
long[] outOffsets) throws IOException;
private /*native*/ final int openNonAssetNative(int cookie, String fileName, int accessMode) {
return openAsset("../" + fileName, accessMode);
}
private native ParcelFileDescriptor openNonAssetFdNative(int cookie,
String fileName, long[] outOffsets) throws IOException;
private native final void destroyAsset(int asset);
private native final int readAssetChar(int asset);
private native final int readAsset(int asset, byte[] b, int off, int len);
private native final long seekAsset(int asset, long offset, int whence);
private native final long getAssetLength(int asset);
private native final long getAssetRemainingLength(int asset);
private native final long openAsset(String fileName, int accessMode);
private native final int openAssetFd(String fileName, int accessMode, long[] offset, long[] length);
private native final void destroyAsset(long asset);
private native final int readAssetChar(long asset);
private native final int readAsset(long asset, byte[] b, long offset, long length);
private native final long seekAsset(long asset, long offset, int whence);
private native final long getAssetLength(long asset);
private native final long getAssetRemainingLength(long asset);
/**
* Returns true if the resource was found, filling in mRetStringBlock and
@@ -894,7 +853,9 @@ public final class AssetManager {
}
private native final void init();
private native final void destroy();
private /*native*/ final void destroy() {
System.out.println("AssetManager.destroy(): STUB");
}
private final void incRefsLocked(int id) {
if (DEBUG_REFS) {