Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 256 insertions, 0 deletions

diff --git a/parser/htmlparser/nsExpatDriver.h b/parser/htmlparser/nsExpatDriver.h
new file mode 100644
index 0000000000..b07ba72b6b
--- /dev/null
+++ b/parser/htmlparser/nsExpatDriver.h
@@ -0,0 +1,256 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef NS_EXPAT_DRIVER__
+#define NS_EXPAT_DRIVER__
+
+#include "expat_config.h"
+#include "expat.h"
+#include "nsCOMPtr.h"
+#include "nsString.h"
+#include "nsIDTD.h"
+#include "nsIInputStream.h"
+#include "nsIParser.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsScanner.h"
+
+#include "rlbox_expat.h"
+#include "nsRLBoxExpatDriver.h"
+#include "mozilla/UniquePtr.h"
+
+class nsIExpatSink;
+struct nsCatalogData;
+class RLBoxExpatSandboxData;
+namespace mozilla {
+template <typename, size_t>
+class Array;
+}
+
+class nsExpatDriver : public nsIDTD {
+  virtual ~nsExpatDriver();
+
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS_FINAL
+  NS_DECL_NSIDTD
+  NS_DECL_CYCLE_COLLECTION_CLASS(nsExpatDriver)
+
+  nsExpatDriver();
+
+  nsresult Initialize(nsIURI* aURI, nsIContentSink* aSink);
+
+  nsresult ResumeParse(nsScanner& aScanner, bool aIsFinalChunk);
+
+  int HandleExternalEntityRef(const char16_t* aOpenEntityNames,
+                              const char16_t* aBase, const char16_t* aSystemId,
+                              const char16_t* aPublicId);
+  static void HandleStartElement(rlbox_sandbox_expat& aSandbox,
+                                 tainted_expat<void*> aUserData,
+                                 tainted_expat<const char16_t*> aName,
+                                 tainted_expat<const char16_t**> aAtts);
+  static void HandleStartElementForSystemPrincipal(
+      rlbox_sandbox_expat& aSandbox, tainted_expat<void*> aUserData,
+      tainted_expat<const char16_t*> aName,
+      tainted_expat<const char16_t**> aAtts);
+  static void HandleEndElement(rlbox_sandbox_expat& aSandbox,
+                               tainted_expat<void*> aUserData,
+                               tainted_expat<const char16_t*> aName);
+  static void HandleEndElementForSystemPrincipal(
+      rlbox_sandbox_expat& aSandbox, tainted_expat<void*> aUserData,
+      tainted_expat<const char16_t*> aName);
+  nsresult HandleCharacterData(const char16_t* aCData, const uint32_t aLength);
+  nsresult HandleComment(const char16_t* aName);
+  nsresult HandleProcessingInstruction(const char16_t* aTarget,
+                                       const char16_t* aData);
+  nsresult HandleXMLDeclaration(const char16_t* aVersion,
+                                const char16_t* aEncoding, int32_t aStandalone);
+  nsresult HandleDefault(const char16_t* aData, const uint32_t aLength);
+  nsresult HandleStartCdataSection();
+  nsresult HandleEndCdataSection();
+  nsresult HandleStartDoctypeDecl(const char16_t* aDoctypeName,
+                                  const char16_t* aSysid,
+                                  const char16_t* aPubid,
+                                  bool aHasInternalSubset);
+  nsresult HandleEndDoctypeDecl();
+
+ private:
+  // Load up an external stream to get external entity information
+  nsresult OpenInputStreamFromExternalDTD(const char16_t* aFPIStr,
+                                          const char16_t* aURLStr,
+                                          nsIURI* aBaseURI,
+                                          nsIInputStream** aStream,
+                                          nsIURI** aAbsURI);
+
+  enum class ChunkOrBufferIsFinal {
+    None,
+    FinalChunk,
+    FinalChunkAndBuffer,
+  };
+
+  /**
+   * Pass a buffer to Expat. If Expat is blocked aBuffer should be null and
+   * aLength should be 0. The result of the call will be stored in
+   * mInternalState. Expat will parse as much of the buffer as it can and store
+   * the rest in its internal buffer.
+   *
+   * @param aBuffer the buffer to pass to Expat. May be null.
+   * @param aLength the length of the buffer to pass to Expat (in number of
+   *                char16_t's). Must be 0 if aBuffer is null and > 0 if
+   *                aBuffer is not null.
+   * @param aIsFinal whether this is the last chunk in a row passed to
+   *                 ParseChunk, and if so whether it's the last chunk and
+   *                 buffer passed to ParseChunk (meaning there will be no more
+   *                 calls to ParseChunk for the document being parsed).
+   * @param aConsumed [out] the number of PRUnichars that Expat consumed. This
+   *                        doesn't include the PRUnichars that Expat stored in
+   *                        its buffer but didn't parse yet.
+   * @param aLastLineLength [out] the length of the last line that Expat has
+   *                              consumed. This will only be computed if
+   *                              aIsFinal is not None or mInternalState is set
+   *                              to a failure.
+   */
+  void ParseChunk(const char16_t* aBuffer, uint32_t aLength,
+                  ChunkOrBufferIsFinal aIsFinal, uint32_t* aConsumed,
+                  XML_Size* aLastLineLength);
+  /**
+   * Wrapper for ParseBuffer. If the buffer is too large to be copied into the
+   * sandbox all at once, splits it into chunks and invokes ParseBuffer in a
+   * loop.
+   *
+   * @param aBuffer the buffer to pass to Expat. May be null.
+   * @param aLength the length of the buffer to pass to Expat (in number of
+   *                char16_t's). Must be 0 if aBuffer is null and > 0 if
+   *                aBuffer is not null.
+   * @param aIsFinal whether there will definitely not be any more new buffers
+   *                 passed in to ParseBuffer
+   * @param aConsumed [out] the number of PRUnichars that Expat consumed. This
+   *                        doesn't include the PRUnichars that Expat stored in
+   *                        its buffer but didn't parse yet.
+   * @param aLastLineLength [out] the length of the last line that Expat has
+   *                              consumed.
+   */
+  void ChunkAndParseBuffer(const char16_t* aBuffer, uint32_t aLength,
+                           bool aIsFinal, uint32_t* aPassedToExpat,
+                           uint32_t* aConsumed, XML_Size* aLastLineLength);
+
+  nsresult HandleError();
+
+  void MaybeStopParser(nsresult aState);
+
+  bool BlockedOrInterrupted() {
+    return mInternalState == NS_ERROR_HTMLPARSER_BLOCK ||
+           mInternalState == NS_ERROR_HTMLPARSER_INTERRUPTED;
+  }
+
+  // Expat allows us to set the base URI for entities. It doesn't use the base
+  // URI itself, but just passes it along to all the entity handlers (just the
+  // external entity reference handler for us). It does expect the base URI as a
+  // null-terminated string, with the same character type as the parsed buffers
+  // (char16_t in our case). Because nsIURI stores a UTF-8 string we have to do
+  // a conversion to UTF-16 for Expat. We also RLBox the Expat parser, so we
+  // also do 2 copies (into RLBox sandbox, and Expat does a copy into its pool).
+  // Most of the time this base URI is unused (the external entity handler is
+  // rarely called), but when it is we also convert it back to a nsIURI, so we
+  // convert the string back to UTF-8.
+  //
+  // We'd rather not do any of these conversions and copies, so we use a (hacky)
+  // workaround. We store all base URIs in an array of nsIURIs. Instead of
+  // passing the real URI to Expat as a string, we pass it a null-terminated
+  // 2-character buffer. The first character of that buffer stores the index of
+  // the corresponding nsIURI in the array (incremented with 1 because 0 is used
+  // to terminate a string). The entity handler can then use the index from the
+  // base URI that Expat passes it to look up the right nsIURI from the array.
+  //
+  // GetExpatBaseURI pushes the nsIURI to the array, and creates the
+  // two-character buffer for it.
+  //
+  // GetBaseURI looks up the right nsIURI in the array, based on the index from
+  // the two-character buffer.
+  using ExpatBaseURI = mozilla::Array<XML_Char, 2>;
+  ExpatBaseURI GetExpatBaseURI(nsIURI* aURI);
+  nsIURI* GetBaseURI(const XML_Char* aBase) const;
+
+  RLBoxExpatSandboxData* SandboxData() const;
+  rlbox_sandbox_expat* Sandbox() const;
+
+  // Destroy expat parser and return sandbox to pool
+  void Destroy();
+
+  mozilla::UniquePtr<mozilla::RLBoxSandboxPoolData> mSandboxPoolData;
+  tainted_expat<XML_Parser> mExpatParser;
+
+  nsString mLastLine;
+  nsString mCDataText;
+  // Various parts of a doctype
+  nsString mDoctypeName;
+  nsString mSystemID;
+  nsString mPublicID;
+  nsString mInternalSubset;
+  bool mInCData;
+  bool mInInternalSubset;
+  bool mInExternalDTD;
+  bool mMadeFinalCallToExpat;
+
+  // Used to track if we're in the parser.
+  bool mInParser;
+
+  nsresult mInternalState;
+
+  // The length of the data in Expat's buffer (in number of PRUnichars).
+  uint32_t mExpatBuffered;
+
+  uint16_t mTagDepth;
+
+  // These sinks all refer the same conceptual object. mOriginalSink is
+  // identical with the nsIContentSink* passed to WillBuildModel, and exists
+  // only to avoid QI-ing back to nsIContentSink*.
+  nsCOMPtr<nsIContentSink> mOriginalSink;
+  nsCOMPtr<nsIExpatSink> mSink;
+
+  const nsCatalogData* mCatalogData;  // weak
+  nsTArray<nsCOMPtr<nsIURI>> mURIs;
+
+  // Used for error reporting.
+  uint64_t mInnerWindowID;
+};
+
+class RLBoxExpatSandboxData : public mozilla::RLBoxSandboxDataBase {
+  friend class RLBoxExpatSandboxPool;
+  friend class nsExpatDriver;
+
+ public:
+  explicit RLBoxExpatSandboxData(uint64_t aSize)
+      : mozilla::RLBoxSandboxDataBase(aSize) {
+    MOZ_COUNT_CTOR(RLBoxExpatSandboxData);
+  }
+  ~RLBoxExpatSandboxData();
+  rlbox_sandbox_expat* Sandbox() const { return mSandbox.get(); }
+  // After getting a sandbox from the pool we need to register the
+  // Handle{Start,End}Element callbacks and associate the driver with the
+  // sandbox.
+  void AttachDriver(bool IsSystemPrincipal, void* aDriver);
+  void DetachDriver();
+
+ private:
+  mozilla::UniquePtr<rlbox_sandbox_expat> mSandbox;
+  // Common expat callbacks that persist across calls to {Attach,Detach}Driver,
+  // and consequently across sandbox reuses.
+  sandbox_callback_expat<XML_XmlDeclHandler> mHandleXMLDeclaration;
+  sandbox_callback_expat<XML_CharacterDataHandler> mHandleCharacterData;
+  sandbox_callback_expat<XML_ProcessingInstructionHandler>
+      mHandleProcessingInstruction;
+  sandbox_callback_expat<XML_DefaultHandler> mHandleDefault;
+  sandbox_callback_expat<XML_ExternalEntityRefHandler> mHandleExternalEntityRef;
+  sandbox_callback_expat<XML_CommentHandler> mHandleComment;
+  sandbox_callback_expat<XML_StartCdataSectionHandler> mHandleStartCdataSection;
+  sandbox_callback_expat<XML_EndCdataSectionHandler> mHandleEndCdataSection;
+  sandbox_callback_expat<XML_StartDoctypeDeclHandler> mHandleStartDoctypeDecl;
+  sandbox_callback_expat<XML_EndDoctypeDeclHandler> mHandleEndDoctypeDecl;
+  // Expat callbacks specific to each driver, and thus (re)set across sandbox
+  // reuses.
+  sandbox_callback_expat<XML_StartElementHandler> mHandleStartElement;
+  sandbox_callback_expat<XML_EndElementHandler> mHandleEndElement;
+};
+
+#endif