Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

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

1 files changed, 714 insertions, 0 deletions

diff --git a/modules/libjar/nsJARURI.cpp b/modules/libjar/nsJARURI.cpp
new file mode 100644
index 0000000000..e6837e998f
--- /dev/null
+++ b/modules/libjar/nsJARURI.cpp
@@ -0,0 +1,714 @@
+/* -*- Mode: C++; tab-width: 4; 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/. */
+
+#include "base/basictypes.h"
+
+#include "nsJARURI.h"
+#include "nsNetUtil.h"
+#include "nsIClassInfoImpl.h"
+#include "nsIIOService.h"
+#include "nsIStandardURL.h"
+#include "nsCRT.h"
+#include "nsReadableUtils.h"
+#include "nsNetCID.h"
+#include "nsIObjectInputStream.h"
+#include "nsIObjectOutputStream.h"
+#include "nsQueryObject.h"
+#include "mozilla/ipc/URIUtils.h"
+
+using namespace mozilla::ipc;
+
+////////////////////////////////////////////////////////////////////////////////
+
+NS_IMPL_CLASSINFO(nsJARURI, nullptr, nsIClassInfo::THREADSAFE, NS_JARURI_CID)
+// Empty CI getter. We only need nsIClassInfo for Serialization
+NS_IMPL_CI_INTERFACE_GETTER0(nsJARURI)
+
+nsJARURI::nsJARURI() {}
+
+nsJARURI::~nsJARURI() {}
+
+// XXX Why is this threadsafe?
+NS_IMPL_ADDREF(nsJARURI)
+NS_IMPL_RELEASE(nsJARURI)
+NS_INTERFACE_MAP_BEGIN(nsJARURI)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIJARURI)
+  NS_INTERFACE_MAP_ENTRY(nsIURI)
+  NS_INTERFACE_MAP_ENTRY(nsIURL)
+  NS_INTERFACE_MAP_ENTRY(nsIJARURI)
+  NS_INTERFACE_MAP_ENTRY(nsISerializable)
+  NS_IMPL_QUERY_CLASSINFO(nsJARURI)
+  NS_INTERFACE_MAP_ENTRY(nsINestedURI)
+  NS_INTERFACE_MAP_ENTRY_CONCRETE(nsJARURI)
+NS_INTERFACE_MAP_END
+
+nsresult nsJARURI::Init(const char* charsetHint) {
+  mCharsetHint = charsetHint;
+  return NS_OK;
+}
+
+#define NS_JAR_SCHEME "jar:"_ns
+#define NS_JAR_DELIMITER "!/"_ns
+#define NS_BOGUS_ENTRY_SCHEME "x:///"_ns
+
+// FormatSpec takes the entry spec (including the "x:///" at the
+// beginning) and gives us a full JAR spec.
+nsresult nsJARURI::FormatSpec(const nsACString& entrySpec, nsACString& result,
+                              bool aIncludeScheme) {
+  // The entrySpec MUST start with "x:///"
+  NS_ASSERTION(StringBeginsWith(entrySpec, NS_BOGUS_ENTRY_SCHEME),
+               "bogus entry spec");
+
+  nsAutoCString fileSpec;
+  nsresult rv = mJARFile->GetSpec(fileSpec);
+  if (NS_FAILED(rv)) return rv;
+
+  if (aIncludeScheme)
+    result = NS_JAR_SCHEME;
+  else
+    result.Truncate();
+
+  result.Append(fileSpec + NS_JAR_DELIMITER +
+                Substring(entrySpec, 5, entrySpec.Length() - 5));
+  return NS_OK;
+}
+
+nsresult nsJARURI::CreateEntryURL(const nsACString& entryFilename,
+                                  const char* charset, nsIURL** url) {
+  *url = nullptr;
+  // Flatten the concatenation, just in case.  See bug 128288
+  nsAutoCString spec(NS_BOGUS_ENTRY_SCHEME + entryFilename);
+  return NS_MutateURI(NS_STANDARDURLMUTATOR_CONTRACTID)
+      .Apply(&nsIStandardURLMutator::Init, nsIStandardURL::URLTYPE_NO_AUTHORITY,
+             -1, spec, charset, nullptr, nullptr)
+      .Finalize(url);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsISerializable methods:
+
+NS_IMETHODIMP
+nsJARURI::Read(nsIObjectInputStream* aStream) {
+  MOZ_ASSERT_UNREACHABLE("Use nsIURIMutator.read() instead");
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+nsresult nsJARURI::ReadPrivate(nsIObjectInputStream* aInputStream) {
+  nsresult rv;
+
+  nsCOMPtr<nsISupports> supports;
+  rv = aInputStream->ReadObject(true, getter_AddRefs(supports));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mJARFile = do_QueryInterface(supports, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aInputStream->ReadObject(true, getter_AddRefs(supports));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mJAREntry = do_QueryInterface(supports);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aInputStream->ReadCString(mCharsetHint);
+  return rv;
+}
+
+NS_IMETHODIMP
+nsJARURI::Write(nsIObjectOutputStream* aOutputStream) {
+  nsresult rv;
+
+  rv = aOutputStream->WriteCompoundObject(mJARFile, NS_GET_IID(nsIURI), true);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aOutputStream->WriteCompoundObject(mJAREntry, NS_GET_IID(nsIURL), true);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aOutputStream->WriteStringZ(mCharsetHint.get());
+  return rv;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsIURI methods:
+
+NS_IMETHODIMP
+nsJARURI::GetSpec(nsACString& aSpec) {
+  nsAutoCString entrySpec;
+  mJAREntry->GetSpec(entrySpec);
+  return FormatSpec(entrySpec, aSpec);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetSpecIgnoringRef(nsACString& aSpec) {
+  nsAutoCString entrySpec;
+  mJAREntry->GetSpecIgnoringRef(entrySpec);
+  return FormatSpec(entrySpec, aSpec);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetDisplaySpec(nsACString& aUnicodeSpec) {
+  return GetSpec(aUnicodeSpec);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetDisplayHostPort(nsACString& aUnicodeHostPort) {
+  return GetHostPort(aUnicodeHostPort);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetDisplayPrePath(nsACString& aPrePath) {
+  return GetPrePath(aPrePath);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetDisplayHost(nsACString& aUnicodeHost) {
+  return GetHost(aUnicodeHost);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetHasRef(bool* result) { return mJAREntry->GetHasRef(result); }
+
+nsresult nsJARURI::SetSpecInternal(const nsACString& aSpec) {
+  return SetSpecWithBase(aSpec, nullptr);
+}
+
+// Queries this list of interfaces. If none match, it queries mURI.
+NS_IMPL_NSIURIMUTATOR_ISUPPORTS(nsJARURI::Mutator, nsIURISetters, nsIURIMutator,
+                                nsIURLMutator, nsISerializable,
+                                nsIJARURIMutator)
+
+NS_IMETHODIMP
+nsJARURI::Mutator::SetFileName(const nsACString& aFileName,
+                               nsIURIMutator** aMutator) {
+  if (!mURI) {
+    return NS_ERROR_NULL_POINTER;
+  }
+  if (aMutator) {
+    nsCOMPtr<nsIURIMutator> mutator = this;
+    mutator.forget(aMutator);
+  }
+  return mURI->SetFileNameInternal(aFileName);
+}
+
+NS_IMETHODIMP
+nsJARURI::Mutator::SetFileBaseName(const nsACString& aFileBaseName,
+                                   nsIURIMutator** aMutator) {
+  if (!mURI) {
+    return NS_ERROR_NULL_POINTER;
+  }
+  if (aMutator) {
+    nsCOMPtr<nsIURIMutator> mutator = this;
+    mutator.forget(aMutator);
+  }
+  return mURI->SetFileBaseNameInternal(aFileBaseName);
+}
+
+NS_IMETHODIMP
+nsJARURI::Mutator::SetFileExtension(const nsACString& aFileExtension,
+                                    nsIURIMutator** aMutator) {
+  if (!mURI) {
+    return NS_ERROR_NULL_POINTER;
+  }
+  if (aMutator) {
+    nsCOMPtr<nsIURIMutator> mutator = this;
+    mutator.forget(aMutator);
+  }
+  return mURI->SetFileExtensionInternal(aFileExtension);
+}
+
+NS_IMETHODIMP
+nsJARURI::Mutate(nsIURIMutator** aMutator) {
+  RefPtr<nsJARURI::Mutator> mutator = new nsJARURI::Mutator();
+  nsresult rv = mutator->InitFromURI(this);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  mutator.forget(aMutator);
+  return NS_OK;
+}
+
+nsresult nsJARURI::SetSpecWithBase(const nsACString& aSpec, nsIURI* aBaseURL) {
+  nsresult rv;
+
+  nsCOMPtr<nsIIOService> ioServ(do_GetIOService(&rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoCString scheme;
+  rv = ioServ->ExtractScheme(aSpec, scheme);
+  if (NS_FAILED(rv)) {
+    // not an absolute URI
+    if (!aBaseURL) return NS_ERROR_MALFORMED_URI;
+
+    RefPtr<nsJARURI> otherJAR = do_QueryObject(aBaseURL);
+    NS_ENSURE_TRUE(otherJAR, NS_NOINTERFACE);
+
+    mJARFile = otherJAR->mJARFile;
+
+    nsCOMPtr<nsIURI> entry;
+
+    rv = NS_MutateURI(NS_STANDARDURLMUTATOR_CONTRACTID)
+             .Apply(&nsIStandardURLMutator::Init,
+                    nsIStandardURL::URLTYPE_NO_AUTHORITY, -1, aSpec,
+                    mCharsetHint.get(), otherJAR->mJAREntry, nullptr)
+             .Finalize(entry);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    mJAREntry = do_QueryInterface(entry);
+    if (!mJAREntry) return NS_NOINTERFACE;
+
+    return NS_OK;
+  }
+
+  NS_ENSURE_TRUE(scheme.EqualsLiteral("jar"), NS_ERROR_MALFORMED_URI);
+
+  nsACString::const_iterator begin, end;
+  aSpec.BeginReading(begin);
+  aSpec.EndReading(end);
+
+  while (begin != end && *begin != ':') ++begin;
+
+  ++begin;  // now we're past the "jar:"
+
+  nsACString::const_iterator delim_begin = begin;
+  nsACString::const_iterator delim_end = end;
+  nsACString::const_iterator frag = begin;
+
+  if (FindInReadable(NS_JAR_DELIMITER, delim_begin, delim_end)) {
+    frag = delim_end;
+  }
+  while (frag != end && (*frag != '#' && *frag != '?')) {
+    ++frag;
+  }
+  if (frag != end) {
+    // there was a fragment or query, mark that as the end of the URL to scan
+    end = frag;
+  }
+
+  // Search backward from the end for the "!/" delimiter. Remember, jar URLs
+  // can nest, e.g.:
+  //    jar:jar:http://www.foo.com/bar.jar!/a.jar!/b.html
+  // This gets the b.html document from out of the a.jar file, that's
+  // contained within the bar.jar file.
+  // Also, the outermost "inner" URI may be a relative URI:
+  //   jar:../relative.jar!/a.html
+
+  delim_begin = begin;
+  delim_end = end;
+
+  if (!RFindInReadable(NS_JAR_DELIMITER, delim_begin, delim_end)) {
+    return NS_ERROR_MALFORMED_URI;
+  }
+
+  rv = ioServ->NewURI(Substring(begin, delim_begin), mCharsetHint.get(),
+                      aBaseURL, getter_AddRefs(mJARFile));
+  if (NS_FAILED(rv)) return rv;
+
+  // skip over any extra '/' chars
+  while (*delim_end == '/') ++delim_end;
+
+  aSpec.EndReading(end);  // set to the original 'end'
+  return SetJAREntry(Substring(delim_end, end));
+}
+
+NS_IMETHODIMP
+nsJARURI::GetPrePath(nsACString& prePath) {
+  prePath = NS_JAR_SCHEME;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsJARURI::GetScheme(nsACString& aScheme) {
+  aScheme = "jar";
+  return NS_OK;
+}
+
+nsresult nsJARURI::SetScheme(const nsACString& aScheme) {
+  // doesn't make sense to set the scheme of a jar: URL
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsJARURI::GetUserPass(nsACString& aUserPass) { return NS_ERROR_FAILURE; }
+
+nsresult nsJARURI::SetUserPass(const nsACString& aUserPass) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsJARURI::GetUsername(nsACString& aUsername) { return NS_ERROR_FAILURE; }
+
+nsresult nsJARURI::SetUsername(const nsACString& aUsername) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsJARURI::GetPassword(nsACString& aPassword) { return NS_ERROR_FAILURE; }
+
+nsresult nsJARURI::SetPassword(const nsACString& aPassword) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsJARURI::GetHostPort(nsACString& aHostPort) { return NS_ERROR_FAILURE; }
+
+nsresult nsJARURI::SetHostPort(const nsACString& aHostPort) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsJARURI::GetHost(nsACString& aHost) { return NS_ERROR_FAILURE; }
+
+nsresult nsJARURI::SetHost(const nsACString& aHost) { return NS_ERROR_FAILURE; }
+
+NS_IMETHODIMP
+nsJARURI::GetPort(int32_t* aPort) { return NS_ERROR_FAILURE; }
+
+nsresult nsJARURI::SetPort(int32_t aPort) { return NS_ERROR_FAILURE; }
+
+nsresult nsJARURI::GetPathQueryRef(nsACString& aPath) {
+  nsAutoCString entrySpec;
+  mJAREntry->GetSpec(entrySpec);
+  return FormatSpec(entrySpec, aPath, false);
+}
+
+nsresult nsJARURI::SetPathQueryRef(const nsACString& aPath) {
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsJARURI::GetAsciiSpec(nsACString& aSpec) {
+  // XXX Shouldn't this like... make sure it returns ASCII or something?
+  return GetSpec(aSpec);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetAsciiHostPort(nsACString& aHostPort) { return NS_ERROR_FAILURE; }
+
+NS_IMETHODIMP
+nsJARURI::GetAsciiHost(nsACString& aHost) { return NS_ERROR_FAILURE; }
+
+NS_IMETHODIMP
+nsJARURI::Equals(nsIURI* other, bool* result) {
+  return EqualsInternal(other, eHonorRef, result);
+}
+
+NS_IMETHODIMP
+nsJARURI::EqualsExceptRef(nsIURI* other, bool* result) {
+  return EqualsInternal(other, eIgnoreRef, result);
+}
+
+// Helper method:
+/* virtual */
+nsresult nsJARURI::EqualsInternal(nsIURI* other,
+                                  nsJARURI::RefHandlingEnum refHandlingMode,
+                                  bool* result) {
+  *result = false;
+
+  if (!other) return NS_OK;  // not equal
+
+  RefPtr<nsJARURI> otherJAR = do_QueryObject(other);
+  if (!otherJAR) return NS_OK;  // not equal
+
+  bool equal;
+  nsresult rv = mJARFile->Equals(otherJAR->mJARFile, &equal);
+  if (NS_FAILED(rv) || !equal) {
+    return rv;  // not equal
+  }
+
+  return refHandlingMode == eHonorRef
+             ? mJAREntry->Equals(otherJAR->mJAREntry, result)
+             : mJAREntry->EqualsExceptRef(otherJAR->mJAREntry, result);
+}
+
+NS_IMETHODIMP
+nsJARURI::SchemeIs(const char* i_Scheme, bool* o_Equals) {
+  MOZ_ASSERT(o_Equals);
+  if (!i_Scheme) {
+    *o_Equals = false;
+    return NS_OK;
+  }
+
+  *o_Equals = nsCRT::strcasecmp("jar", i_Scheme) == 0;
+  return NS_OK;
+}
+
+nsresult nsJARURI::Clone(nsIURI** result) {
+  RefPtr<nsJARURI> uri = new nsJARURI();
+  uri->mJARFile = mJARFile;
+  uri->mJAREntry = mJAREntry;
+  uri.forget(result);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsJARURI::Resolve(const nsACString& relativePath, nsACString& result) {
+  nsresult rv;
+
+  nsCOMPtr<nsIIOService> ioServ(do_GetIOService(&rv));
+  if (NS_FAILED(rv)) return rv;
+
+  nsAutoCString scheme;
+  rv = ioServ->ExtractScheme(relativePath, scheme);
+  if (NS_SUCCEEDED(rv)) {
+    // then aSpec is absolute
+    result = relativePath;
+    return NS_OK;
+  }
+
+  nsAutoCString resolvedPath;
+  mJAREntry->Resolve(relativePath, resolvedPath);
+
+  return FormatSpec(resolvedPath, result);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsIURL methods:
+
+NS_IMETHODIMP
+nsJARURI::GetFilePath(nsACString& filePath) {
+  return mJAREntry->GetFilePath(filePath);
+}
+
+nsresult nsJARURI::SetFilePath(const nsACString& filePath) {
+  return NS_MutateURI(mJAREntry).SetFilePath(filePath).Finalize(mJAREntry);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetQuery(nsACString& query) { return mJAREntry->GetQuery(query); }
+
+nsresult nsJARURI::SetQuery(const nsACString& query) {
+  return NS_MutateURI(mJAREntry).SetQuery(query).Finalize(mJAREntry);
+}
+
+nsresult nsJARURI::SetQueryWithEncoding(const nsACString& query,
+                                        const mozilla::Encoding* encoding) {
+  return NS_MutateURI(mJAREntry)
+      .SetQueryWithEncoding(query, encoding)
+      .Finalize(mJAREntry);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetRef(nsACString& ref) { return mJAREntry->GetRef(ref); }
+
+nsresult nsJARURI::SetRef(const nsACString& ref) {
+  return NS_MutateURI(mJAREntry).SetRef(ref).Finalize(mJAREntry);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetDirectory(nsACString& directory) {
+  return mJAREntry->GetDirectory(directory);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetFileName(nsACString& fileName) {
+  return mJAREntry->GetFileName(fileName);
+}
+
+nsresult nsJARURI::SetFileNameInternal(const nsACString& fileName) {
+  return NS_MutateURI(mJAREntry)
+      .Apply(&nsIURLMutator::SetFileName, fileName, nullptr)
+      .Finalize(mJAREntry);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetFileBaseName(nsACString& fileBaseName) {
+  return mJAREntry->GetFileBaseName(fileBaseName);
+}
+
+nsresult nsJARURI::SetFileBaseNameInternal(const nsACString& fileBaseName) {
+  return NS_MutateURI(mJAREntry)
+      .Apply(&nsIURLMutator::SetFileBaseName, fileBaseName, nullptr)
+      .Finalize(mJAREntry);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetFileExtension(nsACString& fileExtension) {
+  return mJAREntry->GetFileExtension(fileExtension);
+}
+
+nsresult nsJARURI::SetFileExtensionInternal(const nsACString& fileExtension) {
+  return NS_MutateURI(mJAREntry)
+      .Apply(&nsIURLMutator::SetFileExtension, fileExtension, nullptr)
+      .Finalize(mJAREntry);
+}
+
+NS_IMETHODIMP
+nsJARURI::GetCommonBaseSpec(nsIURI* uriToCompare, nsACString& commonSpec) {
+  commonSpec.Truncate();
+
+  NS_ENSURE_ARG_POINTER(uriToCompare);
+
+  commonSpec.Truncate();
+  nsCOMPtr<nsIJARURI> otherJARURI(do_QueryInterface(uriToCompare));
+  if (!otherJARURI) {
+    // Nothing in common
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIURI> otherJARFile;
+  nsresult rv = otherJARURI->GetJARFile(getter_AddRefs(otherJARFile));
+  if (NS_FAILED(rv)) return rv;
+
+  bool equal;
+  rv = mJARFile->Equals(otherJARFile, &equal);
+  if (NS_FAILED(rv)) return rv;
+
+  if (!equal) {
+    // See what the JAR file URIs have in common
+    nsCOMPtr<nsIURL> ourJARFileURL(do_QueryInterface(mJARFile));
+    if (!ourJARFileURL) {
+      // Not a URL, so nothing in common
+      return NS_OK;
+    }
+    nsAutoCString common;
+    rv = ourJARFileURL->GetCommonBaseSpec(otherJARFile, common);
+    if (NS_FAILED(rv)) return rv;
+
+    commonSpec = NS_JAR_SCHEME + common;
+    return NS_OK;
+  }
+
+  // At this point we have the same JAR file.  Compare the JAREntrys
+  nsAutoCString otherEntry;
+  rv = otherJARURI->GetJAREntry(otherEntry);
+  if (NS_FAILED(rv)) return rv;
+
+  nsCOMPtr<nsIURL> url;
+  rv = CreateEntryURL(otherEntry, nullptr, getter_AddRefs(url));
+  if (NS_FAILED(rv)) return rv;
+
+  nsAutoCString common;
+  rv = mJAREntry->GetCommonBaseSpec(url, common);
+  if (NS_FAILED(rv)) return rv;
+
+  rv = FormatSpec(common, commonSpec);
+  return rv;
+}
+
+NS_IMETHODIMP
+nsJARURI::GetRelativeSpec(nsIURI* uriToCompare, nsACString& relativeSpec) {
+  GetSpec(relativeSpec);
+
+  NS_ENSURE_ARG_POINTER(uriToCompare);
+
+  nsCOMPtr<nsIJARURI> otherJARURI(do_QueryInterface(uriToCompare));
+  if (!otherJARURI) {
+    // Nothing in common
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIURI> otherJARFile;
+  nsresult rv = otherJARURI->GetJARFile(getter_AddRefs(otherJARFile));
+  if (NS_FAILED(rv)) return rv;
+
+  bool equal;
+  rv = mJARFile->Equals(otherJARFile, &equal);
+  if (NS_FAILED(rv)) return rv;
+
+  if (!equal) {
+    // We live in different JAR files.  Nothing in common.
+    return rv;
+  }
+
+  // Same JAR file.  Compare the JAREntrys
+  nsAutoCString otherEntry;
+  rv = otherJARURI->GetJAREntry(otherEntry);
+  if (NS_FAILED(rv)) return rv;
+
+  nsCOMPtr<nsIURL> url;
+  rv = CreateEntryURL(otherEntry, nullptr, getter_AddRefs(url));
+  if (NS_FAILED(rv)) return rv;
+
+  nsAutoCString relativeEntrySpec;
+  rv = mJAREntry->GetRelativeSpec(url, relativeEntrySpec);
+  if (NS_FAILED(rv)) return rv;
+
+  if (!StringBeginsWith(relativeEntrySpec, NS_BOGUS_ENTRY_SCHEME)) {
+    // An actual relative spec!
+    relativeSpec = relativeEntrySpec;
+  }
+  return rv;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsIJARURI methods:
+
+NS_IMETHODIMP
+nsJARURI::GetJARFile(nsIURI** jarFile) { return GetInnerURI(jarFile); }
+
+NS_IMETHODIMP
+nsJARURI::GetJAREntry(nsACString& entryPath) {
+  nsAutoCString filePath;
+  mJAREntry->GetFilePath(filePath);
+  NS_ASSERTION(filePath.Length() > 0, "path should never be empty!");
+  // Trim off the leading '/'
+  entryPath = Substring(filePath, 1, filePath.Length() - 1);
+  return NS_OK;
+}
+
+nsresult nsJARURI::SetJAREntry(const nsACString& entryPath) {
+  return CreateEntryURL(entryPath, mCharsetHint.get(),
+                        getter_AddRefs(mJAREntry));
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+NS_IMETHODIMP
+nsJARURI::GetInnerURI(nsIURI** aURI) {
+  nsCOMPtr<nsIURI> uri = mJARFile;
+  uri.forget(aURI);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsJARURI::GetInnermostURI(nsIURI** uri) {
+  return NS_ImplGetInnermostURI(this, uri);
+}
+
+void nsJARURI::Serialize(URIParams& aParams) {
+  JARURIParams params;
+
+  SerializeURI(mJARFile, params.jarFile());
+  SerializeURI(mJAREntry, params.jarEntry());
+  params.charset() = mCharsetHint;
+
+  aParams = params;
+}
+
+bool nsJARURI::Deserialize(const URIParams& aParams) {
+  if (aParams.type() != URIParams::TJARURIParams) {
+    NS_ERROR("Received unknown parameters from the other process!");
+    return false;
+  }
+
+  const JARURIParams& params = aParams.get_JARURIParams();
+
+  nsCOMPtr<nsIURI> file = DeserializeURI(params.jarFile());
+  if (!file) {
+    NS_ERROR("Couldn't deserialize jar file URI!");
+    return false;
+  }
+
+  nsCOMPtr<nsIURI> entry = DeserializeURI(params.jarEntry());
+  if (!entry) {
+    NS_ERROR("Couldn't deserialize jar entry URI!");
+    return false;
+  }
+
+  nsCOMPtr<nsIURL> entryURL = do_QueryInterface(entry);
+  if (!entryURL) {
+    NS_ERROR("Couldn't QI jar entry URI to nsIURL!");
+    return false;
+  }
+
+  mJARFile.swap(file);
+  mJAREntry.swap(entryURL);
+  mCharsetHint = params.charset();
+
+  return true;
+}