Make aapt ignore tools-related data.

This patchset introduces a new standard namespace http://schemas.android.com/tools
which will be used for tools specific XML attributes.
Any attributes using this namespace will not be compiled into the binary XML file.

The namespace node is also not written at all, and its string is not collected
to ensure that there is no impact on the devices.

(cherry picked from commit a5d5e9d)

Change-Id: I62937b8bc34c07ac544930aa8eadd7797e0179d5

Author: Xavier Ducrohet

tools/aapt/XMLNode.cpp

@@ -45,6 +45,7 @@ bool isWhitespace(const char16_t* str)
 
 static const String16 RESOURCES_PREFIX(RESOURCES_ROOT_NAMESPACE);
 static const String16 RESOURCES_PRV_PREFIX(RESOURCES_ROOT_PRV_NAMESPACE);
+static const String16 RESOURCES_TOOLS_NAMESPACE("http://schemas.android.com/tools");
 
 String16 getNamespaceResourcePackage(String16 namespaceUri, bool* outIsPublic)
 {
@@ -761,13 +762,16 @@ status_t XMLNode::addAttribute(const String16& ns, const String16& name,
         SourcePos(mFilename, getStartLineNumber()).error("Child to CDATA node.");
         return UNKNOWN_ERROR;
     }
-    attribute_entry e;
-    e.index = mNextAttributeIndex++;
-    e.ns = ns;
-    e.name = name;
-    e.string = value;
-    mAttributes.add(e);
-    mAttributeOrder.add(e.index, mAttributes.size()-1);
+
+    if (ns != RESOURCES_TOOLS_NAMESPACE) {
+        attribute_entry e;
+        e.index = mNextAttributeIndex++;
+        e.ns = ns;
+        e.name = name;
+        e.string = value;
+        mAttributes.add(e);
+        mAttributeOrder.add(e.index, mAttributes.size()-1);
+    }
     return NO_ERROR;
 }
 
@@ -1215,11 +1219,13 @@ status_t XMLNode::collect_strings(StringPool* dest, Vector<uint32_t>* outResIds,
     collect_attr_strings(dest, outResIds, true);
 
     int i;
-    if (mNamespacePrefix.size() > 0) {
-        dest->add(mNamespacePrefix, true);
-    }
-    if (mNamespaceUri.size() > 0) {
-        dest->add(mNamespaceUri, true);
+    if (RESOURCES_TOOLS_NAMESPACE != mNamespaceUri) {
+        if (mNamespacePrefix.size() > 0) {
+            dest->add(mNamespacePrefix, true);
+        }
+        if (mNamespaceUri.size() > 0) {
+            dest->add(mNamespaceUri, true);
+        }
     }
     if (mElementName.size() > 0) {
         dest->add(mElementName, true);
@@ -1338,6 +1344,7 @@ status_t XMLNode::flatten_node(const StringPool& strings, const sp<AaptFile>& de
     const void* extData = NULL;
     size_t extSize = 0;
     ResXMLTree_attribute attr;
+    bool writeCurrentNode = true;
 
     const size_t NA = mAttributes.size();
     const size_t NC = mChildren.size();
@@ -1350,7 +1357,7 @@ status_t XMLNode::flatten_node(const StringPool& strings, const sp<AaptFile>& de
     const String16 style16("style");
 
     const type type = getType();
-    
+
     memset(&node, 0, sizeof(node));
     memset(&attr, 0, sizeof(attr));
     node.header.headerSize = htods(sizeof(node));
@@ -1395,17 +1402,21 @@ status_t XMLNode::flatten_node(const StringPool& strings, const sp<AaptFile>& de
             }
         }
     } else if (type == TYPE_NAMESPACE) {
-        node.header.type = htods(RES_XML_START_NAMESPACE_TYPE);
-        extData = &namespaceExt;
-        extSize = sizeof(namespaceExt);
-        memset(&namespaceExt, 0, sizeof(namespaceExt));
-        if (mNamespacePrefix.size() > 0) {
-            namespaceExt.prefix.index = htodl(strings.offsetForString(mNamespacePrefix));
+        if (mNamespaceUri == RESOURCES_TOOLS_NAMESPACE) {
+            writeCurrentNode = false;
         } else {
-            namespaceExt.prefix.index = htodl((uint32_t)-1);
+            node.header.type = htods(RES_XML_START_NAMESPACE_TYPE);
+            extData = &namespaceExt;
+            extSize = sizeof(namespaceExt);
+            memset(&namespaceExt, 0, sizeof(namespaceExt));
+            if (mNamespacePrefix.size() > 0) {
+                namespaceExt.prefix.index = htodl(strings.offsetForString(mNamespacePrefix));
+            } else {
+                namespaceExt.prefix.index = htodl((uint32_t)-1);
+            }
+            namespaceExt.prefix.index = htodl(strings.offsetForString(mNamespacePrefix));
+            namespaceExt.uri.index = htodl(strings.offsetForString(mNamespaceUri));
         }
-        namespaceExt.prefix.index = htodl(strings.offsetForString(mNamespacePrefix));
-        namespaceExt.uri.index = htodl(strings.offsetForString(mNamespaceUri));
         LOG_ALWAYS_FATAL_IF(NA != 0, "Namespace nodes can't have attributes!");
     } else if (type == TYPE_CDATA) {
         node.header.type = htods(RES_XML_CDATA_TYPE);
@@ -1422,9 +1433,11 @@ status_t XMLNode::flatten_node(const StringPool& strings, const sp<AaptFile>& de
 
     node.header.size = htodl(sizeof(node) + extSize + (sizeof(attr)*NA));
 
-    dest->writeData(&node, sizeof(node));
-    if (extSize > 0) {
-        dest->writeData(extData, extSize);
+    if (writeCurrentNode) {
+        dest->writeData(&node, sizeof(node));
+        if (extSize > 0) {
+            dest->writeData(extData, extSize);
+        }
     }
 
     for (i=0; i<NA; i++) {
@@ -1476,12 +1489,14 @@ status_t XMLNode::flatten_node(const StringPool& strings, const sp<AaptFile>& de
         dest->writeData(&node, sizeof(node));
         dest->writeData(&endElementExt, sizeof(endElementExt));
     } else if (type == TYPE_NAMESPACE) {
-        node.header.type = htods(RES_XML_END_NAMESPACE_TYPE);
-        node.lineNumber = htodl(getEndLineNumber());
-        node.comment.index = htodl((uint32_t)-1);
-        node.header.size = htodl(sizeof(node)+extSize);
-        dest->writeData(&node, sizeof(node));
-        dest->writeData(extData, extSize);
+        if (writeCurrentNode) {
+            node.header.type = htods(RES_XML_END_NAMESPACE_TYPE);
+            node.lineNumber = htodl(getEndLineNumber());
+            node.comment.index = htodl((uint32_t)-1);
+            node.header.size = htodl(sizeof(node)+extSize);
+            dest->writeData(&node, sizeof(node));
+            dest->writeData(extData, extSize);
+        }
     }
 
     return NO_ERROR;