Merge "module-utils: Create fastxmlserializer utility jar" into main am: a551bb85de

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/modules-utils/+/2819037

Change-Id: I717e021ea47143ea1d975e89bbb156b201da6375
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

2 files changed, 435 insertions, 0 deletions

diff --git a/java/com/android/internal/util/Android.bp b/java/com/android/internal/util/Android.bp
index ea21a6b..c2de1fb 100644
--- a/java/com/android/internal/util/Android.bp
+++ b/java/com/android/internal/util/Android.bp
@@ -38,3 +38,14 @@ java_library {
         "unsupportedappusage",
     ],
 }
+
+java_library {
+    name: "modules-utils-fastxmlserializer",
+    srcs: [
+        "FastXmlSerializer.java",
+    ],
+    defaults: ["modules-utils-defaults"],
+    libs: [
+        "unsupportedappusage",
+    ],
+}
diff --git a/java/com/android/internal/util/FastXmlSerializer.java b/java/com/android/internal/util/FastXmlSerializer.java
new file mode 100644
index 0000000..929c9e8
--- /dev/null
+++ b/java/com/android/internal/util/FastXmlSerializer.java
@@ -0,0 +1,424 @@
+/*
+ * Copyright (C) 2006 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.internal.util;
+
+import android.compat.annotation.UnsupportedAppUsage;
+
+import org.xmlpull.v1.XmlSerializer;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.UnsupportedEncodingException;
+import java.io.Writer;
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetEncoder;
+import java.nio.charset.CoderResult;
+import java.nio.charset.CodingErrorAction;
+import java.nio.charset.IllegalCharsetNameException;
+import java.nio.charset.UnsupportedCharsetException;
+
+/**
+ * This is a quick and dirty implementation of XmlSerializer that isn't horribly
+ * painfully slow like the normal one.  It only does what is needed for the
+ * specific XML files being written with it.
+ */
+public class FastXmlSerializer implements XmlSerializer {
+    private static final String ESCAPE_TABLE[] = new String[] {
+        "�",   "",   "",   "",  "",    "",   "",  "",  // 0-7
+        "",   "	",   "
",  "", "",   "
",  "", "", // 8-15
+        "",  "",  "",  "", "",   "",  "", "", // 16-23
+        "",  "",  "",  "", "",   "",  "", "", // 24-31
+        null,     null,     """, null,     null,     null,     "&",  null,   // 32-39
+        null,     null,     null,     null,     null,     null,     null,     null,   // 40-47
+        null,     null,     null,     null,     null,     null,     null,     null,   // 48-55
+        null,     null,     null,     null,     "<",   null,     ">",   null,   // 56-63
+    };
+
+    private static final int DEFAULT_BUFFER_LEN = 32*1024;
+
+    private static String sSpace = "                                                              ";
+
+    private final int mBufferLen;
+    private final char[] mText;
+    private int mPos;
+
+    private Writer mWriter;
+
+    private OutputStream mOutputStream;
+    private CharsetEncoder mCharset;
+    private ByteBuffer mBytes;
+
+    private boolean mIndent = false;
+    private boolean mInTag;
+
+    private int mNesting = 0;
+    private boolean mLineStart = true;
+
+    @UnsupportedAppUsage
+    public FastXmlSerializer() {
+        this(DEFAULT_BUFFER_LEN);
+    }
+
+    /**
+     * Allocate a FastXmlSerializer with the given internal output buffer size.  If the
+     * size is zero or negative, then the default buffer size will be used.
+     *
+     * @param bufferSize Size in bytes of the in-memory output buffer that the writer will use.
+     */
+    public FastXmlSerializer(int bufferSize) {
+        mBufferLen = (bufferSize > 0) ? bufferSize : DEFAULT_BUFFER_LEN;
+        mText = new char[mBufferLen];
+        mBytes = ByteBuffer.allocate(mBufferLen);
+    }
+
+    private void append(char c) throws IOException {
+        int pos = mPos;
+        if (pos >= (mBufferLen-1)) {
+            flush();
+            pos = mPos;
+        }
+        mText[pos] = c;
+        mPos = pos+1;
+    }
+
+    private void append(String str, int i, final int length) throws IOException {
+        if (length > mBufferLen) {
+            final int end = i + length;
+            while (i < end) {
+                int next = i + mBufferLen;
+                append(str, i, next<end ? mBufferLen : (end-i));
+                i = next;
+            }
+            return;
+        }
+        int pos = mPos;
+        if ((pos+length) > mBufferLen) {
+            flush();
+            pos = mPos;
+        }
+        str.getChars(i, i+length, mText, pos);
+        mPos = pos + length;
+    }
+
+    private void append(char[] buf, int i, final int length) throws IOException {
+        if (length > mBufferLen) {
+            final int end = i + length;
+            while (i < end) {
+                int next = i + mBufferLen;
+                append(buf, i, next<end ? mBufferLen : (end-i));
+                i = next;
+            }
+            return;
+        }
+        int pos = mPos;
+        if ((pos+length) > mBufferLen) {
+            flush();
+            pos = mPos;
+        }
+        System.arraycopy(buf, i, mText, pos, length);
+        mPos = pos + length;
+    }
+
+    private void append(String str) throws IOException {
+        append(str, 0, str.length());
+    }
+
+    private void appendIndent(int indent) throws IOException {
+        indent *= 4;
+        if (indent > sSpace.length()) {
+            indent = sSpace.length();
+        }
+        append(sSpace, 0, indent);
+    }
+
+    private void escapeAndAppendString(final String string) throws IOException {
+        final int N = string.length();
+        final char NE = (char)ESCAPE_TABLE.length;
+        final String[] escapes = ESCAPE_TABLE;
+        int lastPos = 0;
+        int pos;
+        for (pos=0; pos<N; pos++) {
+            char c = string.charAt(pos);
+            if (c >= NE) continue;
+            String escape = escapes[c];
+            if (escape == null) continue;
+            if (lastPos < pos) append(string, lastPos, pos-lastPos);
+            lastPos = pos + 1;
+            append(escape);
+        }
+        if (lastPos < pos) append(string, lastPos, pos-lastPos);
+    }
+
+    private void escapeAndAppendString(char[] buf, int start, int len) throws IOException {
+        final char NE = (char)ESCAPE_TABLE.length;
+        final String[] escapes = ESCAPE_TABLE;
+        int end = start+len;
+        int lastPos = start;
+        int pos;
+        for (pos=start; pos<end; pos++) {
+            char c = buf[pos];
+            if (c >= NE) continue;
+            String escape = escapes[c];
+            if (escape == null) continue;
+            if (lastPos < pos) append(buf, lastPos, pos-lastPos);
+            lastPos = pos + 1;
+            append(escape);
+        }
+        if (lastPos < pos) append(buf, lastPos, pos-lastPos);
+    }
+
+    public XmlSerializer attribute(String namespace, String name, String value) throws IOException,
+            IllegalArgumentException, IllegalStateException {
+        append(' ');
+        if (namespace != null) {
+            append(namespace);
+            append(':');
+        }
+        append(name);
+        append("=\"");
+
+        escapeAndAppendString(value);
+        append('"');
+        mLineStart = false;
+        return this;
+    }
+
+    public void cdsect(String text) throws IOException, IllegalArgumentException,
+            IllegalStateException {
+        throw new UnsupportedOperationException();
+    }
+
+    public void comment(String text) throws IOException, IllegalArgumentException,
+            IllegalStateException {
+        throw new UnsupportedOperationException();
+    }
+
+    public void docdecl(String text) throws IOException, IllegalArgumentException,
+            IllegalStateException {
+        throw new UnsupportedOperationException();
+    }
+
+    public void endDocument() throws IOException, IllegalArgumentException, IllegalStateException {
+        flush();
+    }
+
+    public XmlSerializer endTag(String namespace, String name) throws IOException,
+            IllegalArgumentException, IllegalStateException {
+        mNesting--;
+        if (mInTag) {
+            append(" />\n");
+        } else {
+            if (mIndent && mLineStart) {
+                appendIndent(mNesting);
+            }
+            append("</");
+            if (namespace != null) {
+                append(namespace);
+                append(':');
+            }
+            append(name);
+            append(">\n");
+        }
+        mLineStart = true;
+        mInTag = false;
+        return this;
+    }
+
+    public void entityRef(String text) throws IOException, IllegalArgumentException,
+            IllegalStateException {
+        throw new UnsupportedOperationException();
+    }
+
+    private void flushBytes() throws IOException {
+        int position;
+        if ((position = mBytes.position()) > 0) {
+            mBytes.flip();
+            mOutputStream.write(mBytes.array(), 0, position);
+            mBytes.clear();
+        }
+    }
+
+    public void flush() throws IOException {
+        //Log.i("PackageManager", "flush mPos=" + mPos);
+        if (mPos > 0) {
+            if (mOutputStream != null) {
+                CharBuffer charBuffer = CharBuffer.wrap(mText, 0, mPos);
+                CoderResult result = mCharset.encode(charBuffer, mBytes, true);
+                while (true) {
+                    if (result.isError()) {
+                        throw new IOException(result.toString());
+                    } else if (result.isOverflow()) {
+                        flushBytes();
+                        result = mCharset.encode(charBuffer, mBytes, true);
+                        continue;
+                    }
+                    break;
+                }
+                flushBytes();
+                mOutputStream.flush();
+            } else {
+                mWriter.write(mText, 0, mPos);
+                mWriter.flush();
+            }
+            mPos = 0;
+        }
+    }
+
+    public int getDepth() {
+        throw new UnsupportedOperationException();
+    }
+
+    public boolean getFeature(String name) {
+        throw new UnsupportedOperationException();
+    }
+
+    public String getName() {
+        throw new UnsupportedOperationException();
+    }
+
+    public String getNamespace() {
+        throw new UnsupportedOperationException();
+    }
+
+    public String getPrefix(String namespace, boolean generatePrefix)
+            throws IllegalArgumentException {
+        throw new UnsupportedOperationException();
+    }
+
+    public Object getProperty(String name) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void ignorableWhitespace(String text) throws IOException, IllegalArgumentException,
+            IllegalStateException {
+        throw new UnsupportedOperationException();
+    }
+
+    public void processingInstruction(String text) throws IOException, IllegalArgumentException,
+            IllegalStateException {
+        throw new UnsupportedOperationException();
+    }
+
+    public void setFeature(String name, boolean state) throws IllegalArgumentException,
+            IllegalStateException {
+        if (name.equals("http://xmlpull.org/v1/doc/features.html#indent-output")) {
+            mIndent = true;
+            return;
+        }
+        throw new UnsupportedOperationException();
+    }
+
+    public void setOutput(OutputStream os, String encoding) throws IOException,
+            IllegalArgumentException, IllegalStateException {
+        if (os == null)
+            throw new IllegalArgumentException();
+        if (true) {
+            try {
+                mCharset = Charset.forName(encoding).newEncoder()
+                        .onMalformedInput(CodingErrorAction.REPLACE)
+                        .onUnmappableCharacter(CodingErrorAction.REPLACE);
+            } catch (IllegalCharsetNameException e) {
+                throw (UnsupportedEncodingException) (new UnsupportedEncodingException(
+                        encoding).initCause(e));
+            } catch (UnsupportedCharsetException e) {
+                throw (UnsupportedEncodingException) (new UnsupportedEncodingException(
+                        encoding).initCause(e));
+            }
+            mOutputStream = os;
+        } else {
+            setOutput(
+                encoding == null
+                    ? new OutputStreamWriter(os)
+                    : new OutputStreamWriter(os, encoding));
+        }
+    }
+
+    public void setOutput(Writer writer) throws IOException, IllegalArgumentException,
+            IllegalStateException {
+        mWriter = writer;
+    }
+
+    public void setPrefix(String prefix, String namespace) throws IOException,
+            IllegalArgumentException, IllegalStateException {
+        throw new UnsupportedOperationException();
+    }
+
+    public void setProperty(String name, Object value) throws IllegalArgumentException,
+            IllegalStateException {
+        throw new UnsupportedOperationException();
+    }
+
+    public void startDocument(String encoding, Boolean standalone) throws IOException,
+            IllegalArgumentException, IllegalStateException {
+        append("<?xml version='1.0' encoding='utf-8'");
+        if (standalone != null) {
+            append(" standalone='" + (standalone ? "yes" : "no") + "'");
+        }
+        append(" ?>\n");
+        mLineStart = true;
+    }
+
+    public XmlSerializer startTag(String namespace, String name) throws IOException,
+            IllegalArgumentException, IllegalStateException {
+        if (mInTag) {
+            append(">\n");
+        }
+        if (mIndent) {
+            appendIndent(mNesting);
+        }
+        mNesting++;
+        append('<');
+        if (namespace != null) {
+            append(namespace);
+            append(':');
+        }
+        append(name);
+        mInTag = true;
+        mLineStart = false;
+        return this;
+    }
+
+    public XmlSerializer text(char[] buf, int start, int len) throws IOException,
+            IllegalArgumentException, IllegalStateException {
+        if (mInTag) {
+            append(">");
+            mInTag = false;
+        }
+        escapeAndAppendString(buf, start, len);
+        if (mIndent) {
+            mLineStart = buf[start+len-1] == '\n';
+        }
+        return this;
+    }
+
+    public XmlSerializer text(String text) throws IOException, IllegalArgumentException,
+            IllegalStateException {
+        if (mInTag) {
+            append(">");
+            mInTag = false;
+        }
+        escapeAndAppendString(text);
+        if (mIndent) {
+            mLineStart = text.length() > 0 && (text.charAt(text.length()-1) == '\n');
+        }
+        return this;
+    }
+
+}