Quelle StartupCacheUtils.cpp Sprache: C

/* 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 "nsCOMPtr.h"
#include "nsIInputStream.h"
#include "nsNetUtil.h"
#include "nsIFileURL.h"
#include "nsIJARURI.h"
#include "nsIResProtocolHandler.h"
#include "nsIChromeRegistry.h"
#include "nsStringStream.h"
#include "StartupCacheUtils.h"
#include "mozilla/scache/StartupCache.h"
#include "mozilla/Omnijar.h"

namespace mozilla {
namespace scache {

nsresult NewObjectInputStreamFromBuffer(const char* buffer, uint32_t len,
                                        nsIObjectInputStream** stream) {
  nsCOMPtr<nsIInputStream> stringStream;
  nsresult rv = NS_NewByteInputStream(getter_AddRefs(stringStream),
                                      Span(buffer, len), NS_ASSIGNMENT_DEPEND);
  MOZ_ALWAYS_SUCCEEDS(rv);

  nsCOMPtr<nsIObjectInputStream> objectInput =
      NS_NewObjectInputStream(stringStream);

  objectInput.forget(stream);
  return NS_OK;
}

nsresult NewObjectOutputWrappedStorageStream(
    nsIObjectOutputStream** wrapperStream, nsIStorageStream** stream,
    bool wantDebugStream) {
  nsCOMPtr<nsIStorageStream> storageStream;

  nsresult rv =
      NS_NewStorageStream(256, UINT32_MAX, getter_AddRefs(storageStream));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsIOutputStream> outputStream = do_QueryInterface(storageStream);

  nsCOMPtr<nsIObjectOutputStream> objectOutput =
      NS_NewObjectOutputStream(outputStream);

#ifdef DEBUG
  if (wantDebugStream) {
    // Wrap in debug stream to detect unsupported writes of
    // multiply-referenced non-singleton objects
    StartupCache* sc = StartupCache::GetSingleton();
    NS_ENSURE_TRUE(sc, NS_ERROR_UNEXPECTED);
    nsCOMPtr<nsIObjectOutputStream> debugStream;
    sc->GetDebugObjectOutputStream(objectOutput, getter_AddRefs(debugStream));
    debugStream.forget(wrapperStream);
  } else {
    objectOutput.forget(wrapperStream);
  }
#else
  objectOutput.forget(wrapperStream);
#endif

  storageStream.forget(stream);
  return NS_OK;
}

nsresult NewBufferFromStorageStream(nsIStorageStream* storageStream,
                                    UniqueFreePtr<char[]>* buffer,
                                    uint32_t* len) {
  nsresult rv;
  nsCOMPtr<nsIInputStream> inputStream;
  rv = storageStream->NewInputStream(0, getter_AddRefs(inputStream));
  NS_ENSURE_SUCCESS(rv, rv);

  uint64_t avail64;
  rv = inputStream->Available(&avail64);
  NS_ENSURE_SUCCESS(rv, rv);
  NS_ENSURE_TRUE(avail64 <= UINT32_MAX, NS_ERROR_FILE_TOO_BIG);

  uint32_t avail = (uint32_t)avail64;
  auto temp = UniqueFreePtr<char[]>(
      reinterpret_cast<char*>(malloc(sizeof(char) * avail)));
  uint32_t read;
  rv = inputStream->Read(temp.get(), avail, &read);
  if (NS_SUCCEEDED(rv) && avail != read) rv = NS_ERROR_UNEXPECTED;

  if (NS_FAILED(rv)) {
    return rv;
  }

  *len = avail;
  *buffer = std::move(temp);
  return NS_OK;
}

static const char baseName[2][5] = {"gre/", "app/"};

static inline bool canonicalizeBase(nsAutoCString& spec, nsACString& out) {
  nsAutoCString greBase, appBase;
  nsresult rv = mozilla::Omnijar::GetURIString(mozilla::Omnijar::GRE, greBase);
  if (NS_FAILED(rv) || !greBase.Length()) return false;

  rv = mozilla::Omnijar::GetURIString(mozilla::Omnijar::APP, appBase);
  if (NS_FAILED(rv)) return false;

  bool underGre = StringBeginsWith(spec, greBase);
  bool underApp = appBase.Length() && StringBeginsWith(spec, appBase);

  if (!underGre && !underApp) return false;

  /**
   * At this point, if both underGre and underApp are true, it can be one
   * of the two following cases:
   * - the GRE directory points to a subdirectory of the APP directory,
   *   meaning spec points under GRE.
   * - the APP directory points to a subdirectory of the GRE directory,
   *   meaning spec points under APP.
   * Checking the GRE and APP path length is enough to know in which case
   * we are.
   */
  if (underGre && underApp && greBase.Length() < appBase.Length())
    underGre = false;

  out.AppendLiteral("/resource/");
  out.Append(
      baseName[underGre ? mozilla::Omnijar::GRE : mozilla::Omnijar::APP]);
  out.Append(Substring(spec, underGre ? greBase.Length() : appBase.Length()));
  return true;
}

/**
* ResolveURI transforms a chrome: or resource: URI into the URI for its
* underlying resource, or returns any other URI unchanged.
*/
nsresult ResolveURI(nsIURI* in, nsIURI** out) {
  nsresult rv;

  // Resolve resource:// URIs. At the end of this if/else block, we
  // have both spec and uri variables identifying the same URI.
  if (in->SchemeIs("resource")) {
    nsCOMPtr<nsIIOService> ioService = do_GetIOService(&rv);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIProtocolHandler> ph;
    rv = ioService->GetProtocolHandler("resource", getter_AddRefs(ph));
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIResProtocolHandler> irph(do_QueryInterface(ph, &rv));
    NS_ENSURE_SUCCESS(rv, rv);

    nsAutoCString spec;
    rv = irph->ResolveURI(in, spec);
    NS_ENSURE_SUCCESS(rv, rv);

    return ioService->NewURI(spec, nullptr, nullptr, out);
  }
  if (in->SchemeIs("chrome")) {
    nsCOMPtr<nsIChromeRegistry> chromeReg =
        mozilla::services::GetChromeRegistry();
    if (!chromeReg) return NS_ERROR_UNEXPECTED;

    return chromeReg->ConvertChromeURL(in, out);
  }

  *out = do_AddRef(in).take();
  return NS_OK;
}

static nsresult PathifyURIImpl(nsIURI* in, nsACString& out) {
  nsCOMPtr<nsIURI> uri;
  nsresult rv = ResolveURI(in, getter_AddRefs(uri));
  NS_ENSURE_SUCCESS(rv, rv);

  nsAutoCString spec;
  rv = uri->GetSpec(spec);
  NS_ENSURE_SUCCESS(rv, rv);

  if (!canonicalizeBase(spec, out)) {
    if (uri->SchemeIs("file")) {
      nsCOMPtr<nsIFileURL> baseFileURL;
      baseFileURL = do_QueryInterface(uri, &rv);
      NS_ENSURE_SUCCESS(rv, rv);

      nsAutoCString path;
      rv = baseFileURL->GetPathQueryRef(path);
      NS_ENSURE_SUCCESS(rv, rv);

      out.Append(path);
    } else if (uri->SchemeIs("jar")) {
      nsCOMPtr<nsIJARURI> jarURI = do_QueryInterface(uri, &rv);
      NS_ENSURE_SUCCESS(rv, rv);

      nsCOMPtr<nsIURI> jarFileURI;
      rv = jarURI->GetJARFile(getter_AddRefs(jarFileURI));
      NS_ENSURE_SUCCESS(rv, rv);

      rv = PathifyURIImpl(jarFileURI, out);
      NS_ENSURE_SUCCESS(rv, rv);

      nsAutoCString path;
      rv = jarURI->GetJAREntry(path);
      NS_ENSURE_SUCCESS(rv, rv);
      out.Append('/');
      out.Append(path);
    } else {  // Very unlikely
      rv = uri->GetSpec(spec);
      NS_ENSURE_SUCCESS(rv, rv);

      out.Append('/');
      out.Append(spec);
    }
  }
  return NS_OK;
}

nsresult PathifyURI(const char* loaderType, size_t loaderTypeLength, nsIURI* in,
                    nsACString& out) {
  out.AssignASCII(loaderType, loaderTypeLength);

  return PathifyURIImpl(in, out);
}

}  // namespace scache
}  // namespace mozilla

quality100%

¤ Dauer der Verarbeitung: 0.1 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.