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/*
* Copyright (C) 2024 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 android.utils;
import android.annotation.NonNull;
import android.system.ErrnoException;
import android.system.Os;
import com.android.modules.utils.TypedXmlPullParser;
import libcore.util.XmlObjectFactory;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Copied over partly from frameworks/base/core/java/com/android/internal/util/XmlUtils.java
*
* @hide
*/
public class XmlUtils {
private static final String STRING_ARRAY_SEPARATOR = ":";
/** @hide */
public static final void beginDocument(XmlPullParser parser, String firstElementName)
throws XmlPullParserException, IOException {
int type;
while ((type = parser.next()) != parser.START_TAG
&& type != parser.END_DOCUMENT) {
// Do nothing
}
if (type != parser.START_TAG) {
throw new XmlPullParserException("No start tag found");
}
if (!parser.getName().equals(firstElementName)) {
throw new XmlPullParserException("Unexpected start tag: found " + parser.getName()
+ ", expected " + firstElementName);
}
}
/** @hide */
public static boolean nextElementWithin(XmlPullParser parser, int outerDepth)
throws IOException, XmlPullParserException {
for (;;) {
int type = parser.next();
if (type == XmlPullParser.END_DOCUMENT
|| (type == XmlPullParser.END_TAG && parser.getDepth() == outerDepth)) {
return false;
}
if (type == XmlPullParser.START_TAG
&& parser.getDepth() == outerDepth + 1) {
return true;
}
}
}
private static XmlPullParser newPullParser() {
try {
XmlPullParser parser = XmlObjectFactory.newXmlPullParser();
parser.setFeature(XmlPullParser.FEATURE_PROCESS_DOCDECL, true);
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
return parser;
} catch (XmlPullParserException e) {
throw new AssertionError();
}
}
/** @hide */
public static @NonNull TypedXmlPullParser resolvePullParser(@NonNull InputStream in)
throws IOException {
final byte[] magic = new byte[4];
if (in instanceof FileInputStream) {
try {
Os.pread(((FileInputStream) in).getFD(), magic, 0, magic.length, 0);
} catch (ErrnoException e) {
throw e.rethrowAsIOException();
}
} else {
if (!in.markSupported()) {
in = new BufferedInputStream(in);
}
in.mark(8);
in.read(magic);
in.reset();
}
final TypedXmlPullParser xml;
xml = (TypedXmlPullParser) newPullParser();
try {
xml.setInput(in, "UTF_8");
} catch (XmlPullParserException e) {
throw new IOException(e);
}
return xml;
}
}
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