Allow quoted strings from NativeDaemonConnector

Previously we'd only handled quoted strings going into NDC.  This
change auto-handles quoted strings in broadcasts and allows
protocol handlers to request de-quoted elements when needed instead
of using the generic split(" ").

bug: 6353048
Change-Id: I8a07be86411063ed1b402294edc399b4cc076da5

Author: Robert Greenwalt

services/java/com/android/server/NativeDaemonConnector.java

@@ -94,7 +94,7 @@ public void run() {
     public boolean handleMessage(Message msg) {
         String event = (String) msg.obj;
         try {
-            if (!mCallbacks.onEvent(msg.what, event, event.split(" "))) {
+            if (!mCallbacks.onEvent(msg.what, event, NativeDaemonEvent.unescapeArgs(event))) {
                 log(String.format("Unhandled event '%s'", event));
             }
         } catch (Exception e) {

services/java/com/android/server/NativeDaemonEvent.java

@@ -16,6 +16,7 @@
 
 package com.android.server;
 
+import android.util.Slog;
 import com.google.android.collect.Lists;
 
 import java.util.ArrayList;
@@ -32,12 +33,14 @@ public class NativeDaemonEvent {
     private final int mCode;
     private final String mMessage;
     private final String mRawEvent;
+    private String[] mParsed;
 
     private NativeDaemonEvent(int cmdNumber, int code, String message, String rawEvent) {
         mCmdNumber = cmdNumber;
         mCode = code;
         mMessage = message;
         mRawEvent = rawEvent;
+        mParsed = null;
     }
 
     public int getCmdNumber() {
@@ -166,4 +169,86 @@ public static String[] filterMessageList(NativeDaemonEvent[] events, int matchCo
         }
         return result.toArray(new String[result.size()]);
     }
+
+    /**
+     * Find the Nth field of the event.
+     *
+     * This ignores and code or cmdNum, the first return value is given for N=0.
+     * Also understands "\"quoted\" multiword responses" and tries them as a single field
+     */
+    public String getField(int n) {
+        if (mParsed == null) {
+            mParsed = unescapeArgs(mRawEvent);
+        }
+        n += 2; // skip code and command#
+        if (n > mParsed.length) return null;
+            return mParsed[n];
+        }
+
+    public static String[] unescapeArgs(String rawEvent) {
+        final boolean DEBUG_ROUTINE = false;
+        final String LOGTAG = "unescapeArgs";
+        final ArrayList<String> parsed = new ArrayList<String>();
+        final int length = rawEvent.length();
+        int current = 0;
+        int wordEnd = -1;
+        boolean quoted = false;
+
+        if (DEBUG_ROUTINE) Slog.e(LOGTAG, "parsing '" + rawEvent + "'");
+        if (rawEvent.charAt(current) == '\"') {
+            quoted = true;
+            current++;
+        }
+        while (current < length) {
+            // find the end of the word
+            if (quoted) {
+                wordEnd = current;
+                while ((wordEnd = rawEvent.indexOf('\"', wordEnd)) != -1) {
+                    if (rawEvent.charAt(wordEnd - 1) != '\\') {
+                        break;
+                    } else {
+                        wordEnd++; // skip this escaped quote and keep looking
+                    }
+                }
+            } else {
+                wordEnd = rawEvent.indexOf(' ', current);
+            }
+            // if we didn't find the end-o-word token, take the rest of the string
+            if (wordEnd == -1) wordEnd = length;
+            String word = rawEvent.substring(current, wordEnd);
+            current += word.length();
+            if (!quoted) {
+                word = word.trim();
+            } else {
+                current++;  // skip the trailing quote
+            }
+            // unescape stuff within the word
+            word.replace("\\\\", "\\");
+            word.replace("\\\"", "\"");
+
+            if (DEBUG_ROUTINE) Slog.e(LOGTAG, "found '" + word + "'");
+            parsed.add(word);
+
+            // find the beginning of the next word - either of these options
+            int nextSpace = rawEvent.indexOf(' ', current);
+            int nextQuote = rawEvent.indexOf(" \"", current);
+            if (DEBUG_ROUTINE) {
+                Slog.e(LOGTAG, "nextSpace=" + nextSpace + ", nextQuote=" + nextQuote);
+            }
+            if (nextQuote > -1 && nextQuote <= nextSpace) {
+                quoted = true;
+                current = nextQuote + 2;
+            } else {
+                quoted = false;
+                if (nextSpace > -1) {
+                    current = nextSpace + 1;
+                }
+            } // else we just start the next word after the current and read til the end
+            if (DEBUG_ROUTINE) {
+                Slog.e(LOGTAG, "next loop - current=" + current +
+                        ", length=" + length + ", quoted=" + quoted);
+            }
+        }
+        return parsed.toArray(new String[parsed.size()]);
+    }
 }