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//===-- WindowsManifestMerger.cpp ------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===---------------------------------------------------------------------===//
//
// This file implements the .manifest merger class.
//
//===---------------------------------------------------------------------===//
#include "llvm/Support/WindowsManifestMerger.h"
#include "llvm/Support/MemoryBuffer.h"
#include <stdarg.h>
#define TO_XML_CHAR(X) reinterpret_cast<const unsigned char *>(X)
#define FROM_XML_CHAR(X) reinterpret_cast<const char *>(X)
using namespace llvm;
namespace llvm {
char WindowsManifestError::ID = 0;
WindowsManifestError::WindowsManifestError(const Twine &Msg) : Msg(Msg.str()) {}
void WindowsManifestError::log(raw_ostream &OS) const { OS << Msg; }
static bool xmlStringsEqual(const unsigned char *A, const unsigned char *B) {
return strcmp(FROM_XML_CHAR(A), FROM_XML_CHAR(B)) == 0;
}
bool isMergeableElement(const unsigned char *ElementName) {
for (StringRef S : {"application", "assembly", "assemblyIdentity",
"compatibility", "noInherit", "requestedExecutionLevel",
"requestedPrivileges", "security", "trustInfo"}) {
if (S == FROM_XML_CHAR(ElementName))
return true;
}
return false;
}
XMLNodeImpl getChildWithName(XMLNodeImpl Parent,
const unsigned char *ElementName) {
#if LLVM_LIBXML2_ENABLED
for (XMLNodeImpl Child = Parent->children; Child; Child = Child->next)
if (xmlStringsEqual(Child->name, ElementName)) {
return Child;
}
#endif
return nullptr;
}
const unsigned char *getAttribute(XMLNodeImpl Node,
const unsigned char *AttributeName) {
#if LLVM_LIBXML2_ENABLED
for (xmlAttrPtr Attribute = Node->properties; Attribute != nullptr;
Attribute = Attribute->next) {
if (xmlStringsEqual(Attribute->name, AttributeName))
return Attribute->children->content;
}
#endif
return nullptr;
}
Error mergeAttributes(XMLNodeImpl OriginalNode, XMLNodeImpl AdditionalNode) {
#if LLVM_LIBXML2_ENABLED
for (xmlAttrPtr Attribute = AdditionalNode->properties; Attribute != nullptr;
Attribute = Attribute->next) {
if (const unsigned char *OriginalValue =
getAttribute(OriginalNode, Attribute->name)) {
// Attributes of the same name must also have the same value. Otherwise
// an error is thrown.
if (!xmlStringsEqual(OriginalValue, Attribute->children->content))
return make_error<WindowsManifestError>(
Twine("conflicting attributes for ") +
FROM_XML_CHAR(OriginalNode->name));
} else {
char *NameCopy = strdup(FROM_XML_CHAR(Attribute->name));
char *ContentCopy = strdup(FROM_XML_CHAR(Attribute->children->content));
xmlNewProp(OriginalNode, TO_XML_CHAR(NameCopy), TO_XML_CHAR(ContentCopy));
}
}
#endif
return Error::success();
}
Error treeMerge(XMLNodeImpl OriginalRoot, XMLNodeImpl AdditionalRoot) {
#if LLVM_LIBXML2_ENABLED
XMLNodeImpl AdditionalFirstChild = AdditionalRoot->children;
for (XMLNodeImpl Child = AdditionalFirstChild; Child; Child = Child->next) {
XMLNodeImpl OriginalChildWithName;
if (!isMergeableElement(Child->name) ||
!(OriginalChildWithName =
getChildWithName(OriginalRoot, Child->name))) {
XMLNodeImpl NewChild = xmlCopyNode(Child, 1);
if (!NewChild)
return make_error<WindowsManifestError>(Twine("error when copying ") +
FROM_XML_CHAR(Child->name));
if (NewChild->ns)
xmlFreeNs(NewChild->ns); // xmlCopyNode explicitly defines default
// namespace, undo this here.
if (!xmlAddChild(OriginalRoot, NewChild))
return make_error<WindowsManifestError>(Twine("could not merge ") +
FROM_XML_CHAR(NewChild->name));
} else if (auto E = treeMerge(OriginalChildWithName, Child)) {
return E;
}
}
if (auto E = mergeAttributes(OriginalRoot, AdditionalRoot))
return E;
#endif
return Error::success();
}
void stripCommentsAndText(XMLNodeImpl Root) {
xmlNode StoreNext;
for (XMLNodeImpl Child = Root->children; Child; Child = Child->next) {
if (!xmlStringsEqual(Child->name, TO_XML_CHAR("text")) &&
!xmlStringsEqual(Child->name, TO_XML_CHAR("comment"))) {
stripCommentsAndText(Child);
} else {
StoreNext.next = Child->next;
XMLNodeImpl Remove = Child;
Child = &StoreNext;
xmlUnlinkNode(Remove);
xmlFreeNode(Remove);
}
}
}
WindowsManifestMerger::~WindowsManifestMerger() {
#if LLVM_LIBXML2_ENABLED
for (auto &Doc : MergedDocs)
xmlFreeDoc(Doc);
#endif
}
Error WindowsManifestMerger::merge(const MemoryBuffer &Manifest) {
#if LLVM_LIBXML2_ENABLED
if (Manifest.getBufferSize() == 0)
return make_error<WindowsManifestError>(
"attempted to merge empty manifest");
xmlSetGenericErrorFunc((void *)this, WindowsManifestMerger::errorCallback);
XMLDocumentImpl ManifestXML =
xmlReadMemory(Manifest.getBufferStart(), Manifest.getBufferSize(),
"manifest.xml", nullptr, XML_PARSE_NOBLANKS);
xmlSetGenericErrorFunc(nullptr, nullptr);
if (auto E = getParseError())
return E;
XMLNodeImpl AdditionalRoot = xmlDocGetRootElement(ManifestXML);
stripCommentsAndText(AdditionalRoot);
if (CombinedDoc == nullptr) {
CombinedDoc = ManifestXML;
} else {
XMLNodeImpl CombinedRoot = xmlDocGetRootElement(CombinedDoc);
if (xmlStringsEqual(CombinedRoot->name, AdditionalRoot->name) &&
isMergeableElement(AdditionalRoot->name)) {
if (auto E = treeMerge(CombinedRoot, AdditionalRoot)) {
return E;
}
} else {
XMLNodeImpl NewChild = xmlCopyNode(AdditionalRoot, 1);
if (!NewChild)
return make_error<WindowsManifestError>("could not copy manifest");
if (!xmlAddChild(CombinedRoot, NewChild))
return make_error<WindowsManifestError>("could not append manifest");
}
}
MergedDocs.push_back(ManifestXML);
#endif
return Error::success();
}
std::unique_ptr<MemoryBuffer> WindowsManifestMerger::getMergedManifest() {
#if LLVM_LIBXML2_ENABLED
unsigned char *XmlBuff;
int BufferSize = 0;
if (CombinedDoc) {
std::unique_ptr<xmlDoc> OutputDoc(xmlNewDoc((const unsigned char *)"1.0"));
xmlDocSetRootElement(OutputDoc.get(), xmlDocGetRootElement(CombinedDoc));
xmlKeepBlanksDefault(0);
xmlDocDumpFormatMemory(OutputDoc.get(), &XmlBuff, &BufferSize, 1);
}
if (BufferSize == 0)
return nullptr;
return MemoryBuffer::getMemBuffer(
StringRef(FROM_XML_CHAR(XmlBuff), (size_t)BufferSize));
#else
return nullptr;
#endif
}
void WindowsManifestMerger::errorCallback(void *Ctx, const char *Format, ...) {
auto *Merger = (WindowsManifestMerger *)Ctx;
Merger->ParseErrorOccurred = true;
}
Error WindowsManifestMerger::getParseError() {
if (!ParseErrorOccurred)
return Error::success();
return make_error<WindowsManifestError>("invalid xml document");
}
} // namespace llvm
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