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llvm-project/llvm/lib/WindowsManifest/WindowsManifestMerger.cpp

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//===-- WindowsManifestMerger.cpp ------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===---------------------------------------------------------------------===//
//
// This file implements the .manifest merger class.
//
//===---------------------------------------------------------------------===//
#include "llvm/WindowsManifest/WindowsManifestMerger.h"
#include "llvm/Config/config.h"
#include "llvm/Support/MemoryBuffer.h"
#if LLVM_ENABLE_LIBXML2
#include <libxml/xmlreader.h>
#endif
#define TO_XML_CHAR(X) reinterpret_cast<const unsigned char *>(X)
#define FROM_XML_CHAR(X) reinterpret_cast<const char *>(X)
using namespace llvm;
using namespace windows_manifest;
char WindowsManifestError::ID = 0;
WindowsManifestError::WindowsManifestError(const Twine &Msg) : Msg(Msg.str()) {}
void WindowsManifestError::log(raw_ostream &OS) const { OS << Msg; }
class WindowsManifestMerger::WindowsManifestMergerImpl {
public:
~WindowsManifestMergerImpl();
Error merge(MemoryBufferRef Manifest);
std::unique_ptr<MemoryBuffer> getMergedManifest();
private:
static void errorCallback(void *Ctx, const char *Format, ...);
Error getParseError();
#if LLVM_ENABLE_LIBXML2
xmlDocPtr CombinedDoc = nullptr;
std::vector<xmlDocPtr> MergedDocs;
bool Merged = false;
struct XmlDeleter {
void operator()(xmlChar *Ptr) { xmlFree(Ptr); }
void operator()(xmlDoc *Ptr) { xmlFreeDoc(Ptr); }
};
int BufferSize = 0;
std::unique_ptr<xmlChar, XmlDeleter> Buffer;
#endif
bool ParseErrorOccurred = false;
};
#if LLVM_ENABLE_LIBXML2
static constexpr std::pair<StringLiteral, StringLiteral> MtNsHrefsPrefixes[] = {
{"urn:schemas-microsoft-com:asm.v1", "ms_asmv1"},
{"urn:schemas-microsoft-com:asm.v2", "ms_asmv2"},
{"urn:schemas-microsoft-com:asm.v3", "ms_asmv3"},
{"http://schemas.microsoft.com/SMI/2005/WindowsSettings",
"ms_windowsSettings"},
{"urn:schemas-microsoft-com:compatibility.v1", "ms_compatibilityv1"}};
static bool xmlStringsEqual(const unsigned char *A, const unsigned char *B) {
// Handle null pointers. Comparison of 2 null pointers returns true because
// this indicates the prefix of a default namespace.
if (!A || !B)
return A == B;
return strcmp(FROM_XML_CHAR(A), FROM_XML_CHAR(B)) == 0;
}
static 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;
}
static xmlNodePtr getChildWithName(xmlNodePtr Parent,
const unsigned char *ElementName) {
for (xmlNodePtr Child = Parent->children; Child; Child = Child->next) {
if (xmlStringsEqual(Child->name, ElementName)) {
return Child;
}
}
return nullptr;
}
static xmlAttrPtr getAttribute(xmlNodePtr Node,
const unsigned char *AttributeName) {
for (xmlAttrPtr Attribute = Node->properties; Attribute != nullptr;
Attribute = Attribute->next) {
if (xmlStringsEqual(Attribute->name, AttributeName)) {
return Attribute;
}
}
return nullptr;
}
// Check if namespace specified by HRef1 overrides that of HRef2.
static bool namespaceOverrides(const unsigned char *HRef1,
const unsigned char *HRef2) {
auto HRef1Position = llvm::find_if(
MtNsHrefsPrefixes, [=](const std::pair<StringRef, StringRef> &Element) {
return xmlStringsEqual(HRef1, TO_XML_CHAR(Element.first.data()));
});
auto HRef2Position = llvm::find_if(
MtNsHrefsPrefixes, [=](const std::pair<StringRef, StringRef> &Element) {
return xmlStringsEqual(HRef2, TO_XML_CHAR(Element.first.data()));
});
return HRef1Position < HRef2Position;
}
// Search for prefix-defined namespace specified by HRef, starting on Node and
// continuing recursively upwards. Returns the namespace or nullptr if not
// found.
static xmlNsPtr search(const unsigned char *HRef, xmlNodePtr Node) {
for (xmlNsPtr Def = Node->nsDef; Def; Def = Def->next) {
if (Def->prefix && xmlStringsEqual(Def->href, HRef)) {
return Def;
}
}
if (Node->parent) {
return search(HRef, Node->parent);
}
return nullptr;
}
// Return the prefix that corresponds to the HRef. If HRef is not a recognized
// URI, then just return the HRef itself to use as the prefix.
static const unsigned char *getPrefixForHref(const unsigned char *HRef) {
for (auto &Ns : MtNsHrefsPrefixes) {
if (xmlStringsEqual(HRef, TO_XML_CHAR(Ns.first.data()))) {
return TO_XML_CHAR(Ns.second.data());
}
}
return HRef;
}
// Search for prefix-defined namespace specified by HRef, starting on Node and
// continuing recursively upwards. If it is found, then return it. If it is
// not found, then prefix-define that namespace on the node and return a
// reference to it.
static Expected<xmlNsPtr> searchOrDefine(const unsigned char *HRef,
xmlNodePtr Node) {
if (xmlNsPtr Def = search(HRef, Node))
return Def;
if (xmlNsPtr Def = xmlNewNs(Node, HRef, getPrefixForHref(HRef)))
return Def;
return make_error<WindowsManifestError>("failed to create new namespace");
}
// Set the namespace of OrigionalAttribute on OriginalNode to be that of
// AdditionalAttribute's.
static Error copyAttributeNamespace(xmlAttrPtr OriginalAttribute,
xmlNodePtr OriginalNode,
xmlAttrPtr AdditionalAttribute) {
Expected<xmlNsPtr> ExplicitOrError =
searchOrDefine(AdditionalAttribute->ns->href, OriginalNode);
if (!ExplicitOrError)
return ExplicitOrError.takeError();
OriginalAttribute->ns = std::move(ExplicitOrError.get());
return Error::success();
}
// Return the corresponding namespace definition for the prefix, defined on the
// given Node. Returns nullptr if there is no such definition.
static xmlNsPtr getNamespaceWithPrefix(const unsigned char *Prefix,
xmlNodePtr Node) {
if (Node == nullptr)
return nullptr;
for (xmlNsPtr Def = Node->nsDef; Def; Def = Def->next) {
if (xmlStringsEqual(Def->prefix, Prefix)) {
return Def;
}
}
return nullptr;
}
// Search for the closest inheritable default namespace, starting on (and
// including) the Node and traveling upwards through parent nodes. Returns
// nullptr if there are no inheritable default namespaces.
static xmlNsPtr getClosestDefault(xmlNodePtr Node) {
if (xmlNsPtr Ret = getNamespaceWithPrefix(nullptr, Node))
return Ret;
if (Node->parent == nullptr)
return nullptr;
return getClosestDefault(Node->parent);
}
// Merge the attributes of AdditionalNode into OriginalNode. If attributes
// with identical types are present, they are not duplicated but rather if
// their values are not consistent and error is thrown. In addition, the
// higher priority namespace is used for each attribute, EXCEPT in the case
// of merging two default namespaces and the lower priority namespace
// definition occurs closer than the higher priority one.
static Error mergeAttributes(xmlNodePtr OriginalNode,
xmlNodePtr AdditionalNode) {
xmlNsPtr ClosestDefault = getClosestDefault(OriginalNode);
for (xmlAttrPtr Attribute = AdditionalNode->properties; Attribute;
Attribute = Attribute->next) {
if (xmlAttrPtr OriginalAttribute =
getAttribute(OriginalNode, Attribute->name)) {
if (!xmlStringsEqual(OriginalAttribute->children->content,
Attribute->children->content)) {
return make_error<WindowsManifestError>(
Twine("conflicting attributes for ") +
FROM_XML_CHAR(OriginalNode->name));
}
if (!Attribute->ns) {
continue;
}
if (!OriginalAttribute->ns) {
if (auto E = copyAttributeNamespace(OriginalAttribute, OriginalNode,
Attribute)) {
return E;
}
continue;
}
if (namespaceOverrides(OriginalAttribute->ns->href,
Attribute->ns->href)) {
// In this case, the original attribute has a higher priority namespace
// than the incomiing attribute, however the namespace definition of
// the lower priority namespace occurs first traveling upwards in the
// tree. Therefore the lower priority namespace is applied.
if (!OriginalAttribute->ns->prefix && !Attribute->ns->prefix &&
ClosestDefault &&
xmlStringsEqual(Attribute->ns->href, ClosestDefault->href)) {
if (auto E = copyAttributeNamespace(OriginalAttribute, OriginalNode,
Attribute)) {
return E;
}
continue;
}
continue;
// This covers the case where the incoming attribute has the higher
// priority. The higher priority namespace is applied in all cases
// EXCEPT when both of the namespaces are default inherited, and the
// closest inherited default is the lower priority one.
}
if (Attribute->ns->prefix || OriginalAttribute->ns->prefix ||
(ClosestDefault && !xmlStringsEqual(OriginalAttribute->ns->href,
ClosestDefault->href))) {
if (auto E = copyAttributeNamespace(OriginalAttribute, OriginalNode,
Attribute)) {
return E;
}
continue;
}
continue;
}
// If the incoming attribute is not already found on the node, append it
// to the end of the properties list. Also explicitly apply its
// namespace as a prefix because it might be contained in a separate
// namespace that doesn't use the attribute.
xmlAttrPtr NewProp =
xmlNewProp(OriginalNode, Attribute->name, Attribute->children->content);
Expected<xmlNsPtr> ExplicitOrError =
searchOrDefine(Attribute->ns->href, OriginalNode);
if (!ExplicitOrError)
return ExplicitOrError.takeError();
NewProp->ns = std::move(ExplicitOrError.get());
}
return Error::success();
}
// Given two nodes, return the one with the higher priority namespace.
static xmlNodePtr getDominantNode(xmlNodePtr Node1, xmlNodePtr Node2) {
if (!Node1 || !Node1->ns)
return Node2;
if (!Node2 || !Node2->ns)
return Node1;
if (namespaceOverrides(Node1->ns->href, Node2->ns->href))
return Node1;
return Node2;
}
// Checks if this Node's namespace is inherited or one it defined itself.
static bool hasInheritedNs(xmlNodePtr Node) {
return Node->ns && Node->ns != getNamespaceWithPrefix(Node->ns->prefix, Node);
}
// Check if this Node's namespace is a default namespace that it inherited, as
// opposed to defining itself.
static bool hasInheritedDefaultNs(xmlNodePtr Node) {
return hasInheritedNs(Node) && Node->ns->prefix == nullptr;
}
// Check if this Node's namespace is a default namespace it defined itself.
static bool hasDefinedDefaultNamespace(xmlNodePtr Node) {
return Node->ns && (Node->ns == getNamespaceWithPrefix(nullptr, Node));
}
// For the given explicit prefix-definition of a namespace, travel downwards
// from a node recursively, and for every implicit, inherited default usage of
// that namespace replace it with that explicit prefix use. This is important
// when namespace overriding occurs when merging, so that elements unique to a
// namespace will still stay in that namespace.
static void explicateNamespace(xmlNsPtr PrefixDef, xmlNodePtr Node) {
// If a node as its own default namespace definition it clearly cannot have
// inherited the given default namespace, and neither will any of its
// children.
if (hasDefinedDefaultNamespace(Node))
return;
if (Node->ns && xmlStringsEqual(Node->ns->href, PrefixDef->href) &&
hasInheritedDefaultNs(Node))
Node->ns = PrefixDef;
for (xmlAttrPtr Attribute = Node->properties; Attribute;
Attribute = Attribute->next) {
if (Attribute->ns &&
xmlStringsEqual(Attribute->ns->href, PrefixDef->href)) {
Attribute->ns = PrefixDef;
}
}
for (xmlNodePtr Child = Node->children; Child; Child = Child->next) {
explicateNamespace(PrefixDef, Child);
}
}
// Perform the namespace merge between two nodes.
static Error mergeNamespaces(xmlNodePtr OriginalNode,
xmlNodePtr AdditionalNode) {
// Save the original default namespace definition in case the incoming node
// overrides it.
const unsigned char *OriginalDefinedDefaultHref = nullptr;
if (xmlNsPtr OriginalDefinedDefaultNs =
getNamespaceWithPrefix(nullptr, OriginalNode)) {
OriginalDefinedDefaultHref = xmlStrdup(OriginalDefinedDefaultNs->href);
}
const unsigned char *NewDefinedDefaultHref = nullptr;
// Copy all namespace definitions. There can only be one default namespace
// definition per node, so the higher priority one takes precedence in the
// case of collision.
for (xmlNsPtr Def = AdditionalNode->nsDef; Def; Def = Def->next) {
if (xmlNsPtr OriginalNsDef =
getNamespaceWithPrefix(Def->prefix, OriginalNode)) {
if (!Def->prefix) {
if (namespaceOverrides(Def->href, OriginalNsDef->href)) {
NewDefinedDefaultHref = TO_XML_CHAR(strdup(FROM_XML_CHAR(Def->href)));
}
} else if (!xmlStringsEqual(OriginalNsDef->href, Def->href)) {
return make_error<WindowsManifestError>(
Twine("conflicting namespace definitions for ") +
FROM_XML_CHAR(Def->prefix));
}
} else {
xmlNsPtr NewDef = xmlCopyNamespace(Def);
NewDef->next = OriginalNode->nsDef;
OriginalNode->nsDef = NewDef;
}
}
// Check whether the original node or the incoming node has the higher
// priority namespace. Depending on which one is dominant, we will have
// to recursively apply namespace changes down to children of the original
// node.
xmlNodePtr DominantNode = getDominantNode(OriginalNode, AdditionalNode);
xmlNodePtr NonDominantNode =
DominantNode == OriginalNode ? AdditionalNode : OriginalNode;
if (DominantNode == OriginalNode) {
if (OriginalDefinedDefaultHref) {
xmlNsPtr NonDominantDefinedDefault =
getNamespaceWithPrefix(nullptr, NonDominantNode);
// In this case, both the nodes defined a default namespace. However
// the lower priority node ended up having a higher priority default
// definition. This can occur if the higher priority node is prefix
// namespace defined. In this case we have to define an explicit
// prefix for the overridden definition and apply it to all children
// who relied on that definition.
if (NonDominantDefinedDefault &&
namespaceOverrides(NonDominantDefinedDefault->href,
OriginalDefinedDefaultHref)) {
Expected<xmlNsPtr> EC =
searchOrDefine(OriginalDefinedDefaultHref, DominantNode);
if (!EC) {
return EC.takeError();
}
xmlNsPtr PrefixDominantDefinedDefault = std::move(EC.get());
explicateNamespace(PrefixDominantDefinedDefault, DominantNode);
}
// In this case the node with a higher priority namespace did not have a
// default namespace definition, but the lower priority node did. In this
// case the new default namespace definition is copied. A side effect of
// this is that all children will suddenly find themselves in a different
// default namespace. To maintain correctness we need to ensure that all
// children now explicitly refer to the namespace that they had previously
// implicitly inherited.
} else if (getNamespaceWithPrefix(nullptr, NonDominantNode)) {
if (DominantNode->parent) {
xmlNsPtr ClosestDefault = getClosestDefault(DominantNode->parent);
Expected<xmlNsPtr> EC =
searchOrDefine(ClosestDefault->href, DominantNode);
if (!EC) {
return EC.takeError();
}
xmlNsPtr ExplicitDefault = std::move(EC.get());
explicateNamespace(ExplicitDefault, DominantNode);
}
}
} else {
// Covers case where the incoming node has a default namespace definition
// that overrides the original node's namespace. This always leads to
// the original node receiving that new default namespace.
if (hasDefinedDefaultNamespace(DominantNode)) {
NonDominantNode->ns = getNamespaceWithPrefix(nullptr, NonDominantNode);
} else {
// This covers the case where the incoming node either has a prefix
// namespace, or an inherited default namespace. Since the namespace
// may not yet be defined in the original tree we do a searchOrDefine
// for it, and then set the namespace equal to it.
Expected<xmlNsPtr> EC =
searchOrDefine(DominantNode->ns->href, NonDominantNode);
if (!EC) {
return EC.takeError();
}
xmlNsPtr Explicit = std::move(EC.get());
NonDominantNode->ns = Explicit;
}
// This covers cases where the incoming dominant node HAS a default
// namespace definition, but MIGHT NOT NECESSARILY be in that namespace.
if (xmlNsPtr DominantDefaultDefined =
getNamespaceWithPrefix(nullptr, DominantNode)) {
if (OriginalDefinedDefaultHref) {
if (namespaceOverrides(DominantDefaultDefined->href,
OriginalDefinedDefaultHref)) {
// In this case, the incoming node's default definition overrides
// the original default definition, all children who relied on that
// definition must be updated accordingly.
Expected<xmlNsPtr> EC =
searchOrDefine(OriginalDefinedDefaultHref, NonDominantNode);
if (!EC) {
return EC.takeError();
}
xmlNsPtr ExplicitDefault = std::move(EC.get());
explicateNamespace(ExplicitDefault, NonDominantNode);
}
} else {
// The original did not define a default definition, however the new
// default definition still applies to all children, so they must be
// updated to explicitly refer to the namespace they had previously
// been inheriting implicitly.
xmlNsPtr ClosestDefault = getClosestDefault(NonDominantNode);
Expected<xmlNsPtr> EC =
searchOrDefine(ClosestDefault->href, NonDominantNode);
if (!EC) {
return EC.takeError();
}
xmlNsPtr ExplicitDefault = std::move(EC.get());
explicateNamespace(ExplicitDefault, NonDominantNode);
}
}
}
if (NewDefinedDefaultHref) {
xmlNsPtr OriginalNsDef = getNamespaceWithPrefix(nullptr, OriginalNode);
xmlFree(const_cast<unsigned char *>(OriginalNsDef->href));
OriginalNsDef->href = NewDefinedDefaultHref;
}
xmlFree(const_cast<unsigned char *>(OriginalDefinedDefaultHref));
return Error::success();
}
static bool isRecognizedNamespace(const unsigned char *NsHref) {
for (auto &Ns : MtNsHrefsPrefixes) {
if (xmlStringsEqual(NsHref, TO_XML_CHAR(Ns.first.data()))) {
return true;
}
}
return false;
}
static bool hasRecognizedNamespace(xmlNodePtr Node) {
return isRecognizedNamespace(Node->ns->href);
}
// Ensure a node's inherited namespace is actually defined in the tree it
// resides in.
static Error reconcileNamespaces(xmlNodePtr Node) {
if (!Node) {
return Error::success();
}
if (hasInheritedNs(Node)) {
Expected<xmlNsPtr> ExplicitOrError = searchOrDefine(Node->ns->href, Node);
if (!ExplicitOrError) {
return ExplicitOrError.takeError();
}
xmlNsPtr Explicit = std::move(ExplicitOrError.get());
Node->ns = Explicit;
}
for (xmlNodePtr Child = Node->children; Child; Child = Child->next) {
if (auto E = reconcileNamespaces(Child)) {
return E;
}
}
return Error::success();
}
// Recursively merge the two given manifest trees, depending on which elements
// are of a mergeable type, and choose namespaces according to which have
// higher priority.
static Error treeMerge(xmlNodePtr OriginalRoot, xmlNodePtr AdditionalRoot) {
if (auto E = mergeAttributes(OriginalRoot, AdditionalRoot))
return E;
if (auto E = mergeNamespaces(OriginalRoot, AdditionalRoot))
return E;
xmlNodePtr AdditionalFirstChild = AdditionalRoot->children;
xmlNode StoreNext;
for (xmlNodePtr Child = AdditionalFirstChild; Child; Child = Child->next) {
xmlNodePtr OriginalChildWithName;
if (!isMergeableElement(Child->name) ||
!(OriginalChildWithName =
getChildWithName(OriginalRoot, Child->name)) ||
!hasRecognizedNamespace(Child)) {
StoreNext.next = Child->next;
xmlUnlinkNode(Child);
if (!xmlAddChild(OriginalRoot, Child)) {
return make_error<WindowsManifestError>(Twine("could not merge ") +
FROM_XML_CHAR(Child->name));
}
if (auto E = reconcileNamespaces(Child)) {
return E;
}
Child = &StoreNext;
} else if (auto E = treeMerge(OriginalChildWithName, Child)) {
return E;
}
}
return Error::success();
}
static void stripComments(xmlNodePtr Root) {
xmlNode StoreNext;
for (xmlNodePtr Child = Root->children; Child; Child = Child->next) {
if (!xmlStringsEqual(Child->name, TO_XML_CHAR("comment"))) {
stripComments(Child);
continue;
}
StoreNext.next = Child->next;
xmlNodePtr Remove = Child;
Child = &StoreNext;
xmlUnlinkNode(Remove);
xmlFreeNode(Remove);
}
}
// libxml2 assumes that attributes do not inherit default namespaces, whereas
// the original mt.exe does make this assumption. This function reconciles
// this by setting all attributes to have the inherited default namespace.
static void setAttributeNamespaces(xmlNodePtr Node) {
for (xmlAttrPtr Attribute = Node->properties; Attribute;
Attribute = Attribute->next) {
if (!Attribute->ns) {
Attribute->ns = getClosestDefault(Node);
}
}
for (xmlNodePtr Child = Node->children; Child; Child = Child->next) {
setAttributeNamespaces(Child);
}
}
// The merging process may create too many prefix defined namespaces. This
// function removes all unnecessary ones from the tree.
static void checkAndStripPrefixes(xmlNodePtr Node,
std::vector<xmlNsPtr> &RequiredPrefixes) {
for (xmlNodePtr Child = Node->children; Child; Child = Child->next) {
checkAndStripPrefixes(Child, RequiredPrefixes);
}
if (Node->ns && Node->ns->prefix != nullptr) {
xmlNsPtr ClosestDefault = getClosestDefault(Node);
if (ClosestDefault &&
xmlStringsEqual(ClosestDefault->href, Node->ns->href)) {
Node->ns = ClosestDefault;
} else if (!llvm::is_contained(RequiredPrefixes, Node->ns)) {
RequiredPrefixes.push_back(Node->ns);
}
}
for (xmlAttrPtr Attribute = Node->properties; Attribute;
Attribute = Attribute->next) {
if (Attribute->ns && Attribute->ns->prefix != nullptr) {
xmlNsPtr ClosestDefault = getClosestDefault(Node);
if (ClosestDefault &&
xmlStringsEqual(ClosestDefault->href, Attribute->ns->href)) {
Attribute->ns = ClosestDefault;
} else if (!llvm::is_contained(RequiredPrefixes, Node->ns)) {
RequiredPrefixes.push_back(Attribute->ns);
}
}
}
xmlNsPtr Prev;
xmlNs Temp;
for (xmlNsPtr Def = Node->nsDef; Def; Def = Def->next) {
if (!Def->prefix || llvm::is_contained(RequiredPrefixes, Def)) {
Prev = Def;
continue;
}
if (Def == Node->nsDef) {
Node->nsDef = Def->next;
} else {
Prev->next = Def->next;
}
Temp.next = Def->next;
xmlFreeNs(Def);
Def = &Temp;
}
}
WindowsManifestMerger::WindowsManifestMergerImpl::~WindowsManifestMergerImpl() {
for (auto &Doc : MergedDocs)
xmlFreeDoc(Doc);
}
Error WindowsManifestMerger::WindowsManifestMergerImpl::merge(
MemoryBufferRef Manifest) {
if (Merged)
return make_error<WindowsManifestError>(
"merge after getMergedManifest is not supported");
if (Manifest.getBufferSize() == 0)
return make_error<WindowsManifestError>(
"attempted to merge empty manifest");
xmlSetGenericErrorFunc((void *)this,
WindowsManifestMergerImpl::errorCallback);
xmlDocPtr ManifestXML = xmlReadMemory(
Manifest.getBufferStart(), Manifest.getBufferSize(), "manifest.xml",
nullptr, XML_PARSE_NOBLANKS | XML_PARSE_NODICT);
xmlSetGenericErrorFunc(nullptr, nullptr);
if (auto E = getParseError())
return E;
xmlNodePtr AdditionalRoot = xmlDocGetRootElement(ManifestXML);
stripComments(AdditionalRoot);
setAttributeNamespaces(AdditionalRoot);
if (CombinedDoc == nullptr) {
CombinedDoc = ManifestXML;
} else {
xmlNodePtr CombinedRoot = xmlDocGetRootElement(CombinedDoc);
if (!xmlStringsEqual(CombinedRoot->name, AdditionalRoot->name) ||
!isMergeableElement(AdditionalRoot->name) ||
!hasRecognizedNamespace(AdditionalRoot)) {
return make_error<WindowsManifestError>("multiple root nodes");
}
if (auto E = treeMerge(CombinedRoot, AdditionalRoot)) {
return E;
}
}
MergedDocs.push_back(ManifestXML);
return Error::success();
}
std::unique_ptr<MemoryBuffer>
WindowsManifestMerger::WindowsManifestMergerImpl::getMergedManifest() {
if (!Merged) {
Merged = true;
if (!CombinedDoc)
return nullptr;
xmlNodePtr CombinedRoot = xmlDocGetRootElement(CombinedDoc);
std::vector<xmlNsPtr> RequiredPrefixes;
checkAndStripPrefixes(CombinedRoot, RequiredPrefixes);
std::unique_ptr<xmlDoc, XmlDeleter> OutputDoc(
xmlNewDoc((const unsigned char *)"1.0"));
xmlDocSetRootElement(OutputDoc.get(), CombinedRoot);
assert(nullptr == xmlDocGetRootElement(CombinedDoc));
xmlKeepBlanksDefault(0);
xmlChar *Buff = nullptr;
xmlDocDumpFormatMemoryEnc(OutputDoc.get(), &Buff, &BufferSize, "UTF-8", 1);
Buffer.reset(Buff);
}
return BufferSize ? MemoryBuffer::getMemBufferCopy(StringRef(
FROM_XML_CHAR(Buffer.get()), (size_t)BufferSize))
: nullptr;
}
bool windows_manifest::isAvailable() { return true; }
#else
WindowsManifestMerger::WindowsManifestMergerImpl::~WindowsManifestMergerImpl() {
}
Error WindowsManifestMerger::WindowsManifestMergerImpl::merge(
MemoryBufferRef Manifest) {
return make_error<WindowsManifestError>("no libxml2");
}
std::unique_ptr<MemoryBuffer>
WindowsManifestMerger::WindowsManifestMergerImpl::getMergedManifest() {
return nullptr;
}
bool windows_manifest::isAvailable() { return false; }
#endif
WindowsManifestMerger::WindowsManifestMerger()
: Impl(std::make_unique<WindowsManifestMergerImpl>()) {}
WindowsManifestMerger::~WindowsManifestMerger() = default;
Error WindowsManifestMerger::merge(MemoryBufferRef Manifest) {
return Impl->merge(Manifest);
}
std::unique_ptr<MemoryBuffer> WindowsManifestMerger::getMergedManifest() {
return Impl->getMergedManifest();
}
void WindowsManifestMerger::WindowsManifestMergerImpl::errorCallback(
void *Ctx, const char *Format, ...) {
auto *Merger = (WindowsManifestMergerImpl *)Ctx;
Merger->ParseErrorOccurred = true;
}
Error WindowsManifestMerger::WindowsManifestMergerImpl::getParseError() {
if (!ParseErrorOccurred)
return Error::success();
return make_error<WindowsManifestError>("invalid xml document");
}
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