1 files changed, 365 insertions, 0 deletions

diff --git a/core/java/com/android/internal/util/FastXmlSerializer.java b/core/java/com/android/internal/util/FastXmlSerializer.java
new file mode 100644
index 0000000..592a8fa
--- /dev/null
+++ b/core/java/com/android/internal/util/FastXmlSerializer.java
@@ -0,0 +1,365 @@
+/*
+ * 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 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.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[] {
+        null,     null,     null,     null,     null,     null,     null,     null,  // 0-7
+        null,     null,     null,     null,     null,     null,     null,     null,  // 8-15
+        null,     null,     null,     null,     null,     null,     null,     null,  // 16-23
+        null,     null,     null,     null,     null,     null,     null,     null,  // 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 BUFFER_LEN = 8192;
+
+    private final char[] mText = new char[BUFFER_LEN];
+    private int mPos;
+
+    private Writer mWriter;
+
+    private OutputStream mOutputStream;
+    private CharsetEncoder mCharset;
+    private ByteBuffer mBytes = ByteBuffer.allocate(BUFFER_LEN);
+
+    private boolean mInTag;
+
+    private void append(char c) throws IOException {
+        int pos = mPos;
+        if (pos >= (BUFFER_LEN-1)) {
+            flush();
+            pos = mPos;
+        }
+        mText[pos] = c;
+        mPos = pos+1;
+    }
+
+    private void append(String str, int i, final int length) throws IOException {
+        if (length > BUFFER_LEN) {
+            final int end = i + length;
+            while (i < end) {
+                int next = i + BUFFER_LEN;
+                append(str, i, next<end ? BUFFER_LEN : (end-i));
+                i = next;
+            }
+            return;
+        }
+        int pos = mPos;
+        if ((pos+length) > BUFFER_LEN) {
+            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 > BUFFER_LEN) {
+            final int end = i + length;
+            while (i < end) {
+                int next = i + BUFFER_LEN;
+                append(buf, i, next<end ? BUFFER_LEN : (end-i));
+                i = next;
+            }
+            return;
+        }
+        int pos = mPos;
+        if ((pos+length) > BUFFER_LEN) {
+            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 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('"');
+        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 {
+        if (mInTag) {
+            append(" />\n");
+        } else {
+            append("</");
+            if (namespace != null) {
+                append(namespace);
+                append(':');
+            }
+            append(name);
+            append(">\n");
+        }
+        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")) {
+            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();
+            } 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' standalone='"
+                + (standalone ? "yes" : "no") + "' ?>\n");
+    }
+
+    public XmlSerializer startTag(String namespace, String name) throws IOException,
+            IllegalArgumentException, IllegalStateException {
+        if (mInTag) {
+            append(">\n");
+        }
+        append('<');
+        if (namespace != null) {
+            append(namespace);
+            append(':');
+        }
+        append(name);
+        mInTag = true;
+        return this;
+    }
+
+    public XmlSerializer text(char[] buf, int start, int len) throws IOException,
+            IllegalArgumentException, IllegalStateException {
+        if (mInTag) {
+            append(">");
+            mInTag = false;
+        }
+        escapeAndAppendString(buf, start, len);
+        return this;
+    }
+
+    public XmlSerializer text(String text) throws IOException, IllegalArgumentException,
+            IllegalStateException {
+        if (mInTag) {
+            append(">");
+            mInTag = false;
+        }
+        escapeAndAppendString(text);
+        return this;
+    }
+
+}