Add m-esr52 at 52.6.0

1 files changed, 659 insertions, 0 deletions

diff --git a/netwerk/streamconv/converters/nsHTTPCompressConv.cpp b/netwerk/streamconv/converters/nsHTTPCompressConv.cpp
new file mode 100644
index 000000000..37b4b28b0
--- /dev/null
+++ b/netwerk/streamconv/converters/nsHTTPCompressConv.cpp
@@ -0,0 +1,659 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et tw=80 : */
+/* 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 "nsHTTPCompressConv.h"
+#include "nsMemory.h"
+#include "plstr.h"
+#include "nsCOMPtr.h"
+#include "nsError.h"
+#include "nsStreamUtils.h"
+#include "nsStringStream.h"
+#include "nsComponentManagerUtils.h"
+#include "nsThreadUtils.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/Logging.h"
+#include "nsIForcePendingChannel.h"
+#include "nsIRequest.h"
+
+// brotli headers
+#include "state.h"
+#include "decode.h"
+
+namespace mozilla {
+namespace net {
+
+extern LazyLogModule gHttpLog;
+#define LOG(args) MOZ_LOG(mozilla::net::gHttpLog, mozilla::LogLevel::Debug, args)
+
+// nsISupports implementation
+NS_IMPL_ISUPPORTS(nsHTTPCompressConv,
+                  nsIStreamConverter,
+                  nsIStreamListener,
+                  nsIRequestObserver,
+                  nsICompressConvStats)
+
+// nsFTPDirListingConv methods
+nsHTTPCompressConv::nsHTTPCompressConv()
+  : mMode(HTTP_COMPRESS_IDENTITY)
+  , mOutBuffer(nullptr)
+  , mInpBuffer(nullptr)
+  , mOutBufferLen(0)
+  , mInpBufferLen(0)
+  , mCheckHeaderDone(false)
+  , mStreamEnded(false)
+  , mStreamInitialized(false)
+  , mLen(0)
+  , hMode(0)
+  , mSkipCount(0)
+  , mFlags(0)
+  , mDecodedDataLength(0)
+{
+  LOG(("nsHttpCompresssConv %p ctor\n", this));
+  if (NS_IsMainThread()) {
+    mFailUncleanStops =
+      Preferences::GetBool("network.http.enforce-framing.http", false);
+  } else {
+    mFailUncleanStops = false;
+  }
+}
+
+nsHTTPCompressConv::~nsHTTPCompressConv()
+{
+  LOG(("nsHttpCompresssConv %p dtor\n", this));
+  if (mInpBuffer) {
+    free(mInpBuffer);
+  }
+
+  if (mOutBuffer) {
+    free(mOutBuffer);
+  }
+
+  // For some reason we are not getting Z_STREAM_END.  But this was also seen
+  //    for mozilla bug 198133.  Need to handle this case.
+  if (mStreamInitialized && !mStreamEnded) {
+    inflateEnd (&d_stream);
+  }
+}
+
+NS_IMETHODIMP
+nsHTTPCompressConv::GetDecodedDataLength(uint64_t *aDecodedDataLength)
+{
+    *aDecodedDataLength = mDecodedDataLength;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsHTTPCompressConv::AsyncConvertData(const char *aFromType,
+                                     const char *aToType,
+                                     nsIStreamListener *aListener,
+                                     nsISupports *aCtxt)
+{
+  if (!PL_strncasecmp(aFromType, HTTP_COMPRESS_TYPE, sizeof(HTTP_COMPRESS_TYPE)-1) ||
+      !PL_strncasecmp(aFromType, HTTP_X_COMPRESS_TYPE, sizeof(HTTP_X_COMPRESS_TYPE)-1)) {
+    mMode = HTTP_COMPRESS_COMPRESS;
+  } else if (!PL_strncasecmp(aFromType, HTTP_GZIP_TYPE, sizeof(HTTP_GZIP_TYPE)-1) ||
+             !PL_strncasecmp(aFromType, HTTP_X_GZIP_TYPE, sizeof(HTTP_X_GZIP_TYPE)-1)) {
+    mMode = HTTP_COMPRESS_GZIP;
+  } else if (!PL_strncasecmp(aFromType, HTTP_DEFLATE_TYPE, sizeof(HTTP_DEFLATE_TYPE)-1)) {
+    mMode = HTTP_COMPRESS_DEFLATE;
+  } else if (!PL_strncasecmp(aFromType, HTTP_BROTLI_TYPE, sizeof(HTTP_BROTLI_TYPE)-1)) {
+    mMode = HTTP_COMPRESS_BROTLI;
+  }
+  LOG(("nsHttpCompresssConv %p AsyncConvertData %s %s mode %d\n",
+       this, aFromType, aToType, mMode));
+
+  // hook ourself up with the receiving listener.
+  mListener = aListener;
+
+  mAsyncConvContext = aCtxt;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsHTTPCompressConv::OnStartRequest(nsIRequest* request, nsISupports *aContext)
+{
+  LOG(("nsHttpCompresssConv %p onstart\n", this));
+  return mListener->OnStartRequest(request, aContext);
+}
+
+NS_IMETHODIMP
+nsHTTPCompressConv::OnStopRequest(nsIRequest* request, nsISupports *aContext,
+                                  nsresult aStatus)
+{
+  nsresult status = aStatus;
+  LOG(("nsHttpCompresssConv %p onstop %x\n", this, aStatus));
+  
+  // Framing integrity is enforced for content-encoding: gzip, but not for
+  // content-encoding: deflate. Note that gzip vs deflate is NOT determined
+  // by content sniffing but only via header.
+  if (!mStreamEnded && NS_SUCCEEDED(status) &&
+      (mFailUncleanStops && (mMode == HTTP_COMPRESS_GZIP)) ) {
+    // This is not a clean end of gzip stream: the transfer is incomplete.
+    status = NS_ERROR_NET_PARTIAL_TRANSFER;
+    LOG(("nsHttpCompresssConv %p onstop partial gzip\n", this));
+  }
+  if (NS_SUCCEEDED(status) && mMode == HTTP_COMPRESS_BROTLI) {
+    nsCOMPtr<nsIForcePendingChannel> fpChannel = do_QueryInterface(request);
+    bool isPending = false;
+    if (request) {
+      request->IsPending(&isPending);
+    }
+    if (fpChannel && !isPending) {
+      fpChannel->ForcePending(true);
+    }
+    if (mBrotli && (mBrotli->mTotalOut == 0) && !BrotliStateIsStreamEnd(&mBrotli->mState)) {
+      status = NS_ERROR_INVALID_CONTENT_ENCODING;
+    }
+    LOG(("nsHttpCompresssConv %p onstop brotlihandler rv %x\n", this, status));
+    if (fpChannel && !isPending) {
+      fpChannel->ForcePending(false);
+    }
+  }
+  return mListener->OnStopRequest(request, aContext, status);
+}
+
+
+/* static */ nsresult
+nsHTTPCompressConv::BrotliHandler(nsIInputStream *stream, void *closure, const char *dataIn,
+                                  uint32_t, uint32_t aAvail, uint32_t *countRead)
+{
+  MOZ_ASSERT(stream);
+  nsHTTPCompressConv *self = static_cast<nsHTTPCompressConv *>(closure);
+  *countRead = 0;
+
+  const size_t kOutSize = 128 * 1024; // just a chunk size, we call in a loop
+  uint8_t *outPtr;
+  size_t outSize;
+  size_t avail = aAvail;
+  BrotliResult res;
+
+  if (!self->mBrotli) {
+    *countRead = aAvail;
+    return NS_OK;
+  }
+
+  auto outBuffer = MakeUniqueFallible<uint8_t[]>(kOutSize);
+  if (outBuffer == nullptr) {
+    self->mBrotli->mStatus = NS_ERROR_OUT_OF_MEMORY;
+    return self->mBrotli->mStatus;
+  }
+
+  do {
+    outSize = kOutSize;
+    outPtr = outBuffer.get();
+
+    // brotli api is documented in brotli/dec/decode.h and brotli/dec/decode.c
+    LOG(("nsHttpCompresssConv %p brotlihandler decompress %d\n", self, avail));
+    res = ::BrotliDecompressStream(
+      &avail, reinterpret_cast<const unsigned char **>(&dataIn),
+      &outSize, &outPtr, &self->mBrotli->mTotalOut, &self->mBrotli->mState);
+    outSize = kOutSize - outSize;
+    LOG(("nsHttpCompresssConv %p brotlihandler decompress rv=%x out=%d\n",
+         self, res, outSize));
+
+    if (res == BROTLI_RESULT_ERROR) {
+      LOG(("nsHttpCompressConv %p marking invalid encoding", self));
+      self->mBrotli->mStatus = NS_ERROR_INVALID_CONTENT_ENCODING;
+      return self->mBrotli->mStatus;
+    }
+
+    // in 'the current implementation' brotli must consume everything before
+    // asking for more input
+    if (res == BROTLI_RESULT_NEEDS_MORE_INPUT) {
+      MOZ_ASSERT(!avail);
+      if (avail) {
+        LOG(("nsHttpCompressConv %p did not consume all input", self));
+        self->mBrotli->mStatus = NS_ERROR_UNEXPECTED;
+        return self->mBrotli->mStatus;
+      }
+    }
+    if (outSize > 0) {
+      nsresult rv = self->do_OnDataAvailable(self->mBrotli->mRequest,
+                                             self->mBrotli->mContext,
+                                             self->mBrotli->mSourceOffset,
+                                             reinterpret_cast<const char *>(outBuffer.get()),
+                                             outSize);
+      LOG(("nsHttpCompressConv %p BrotliHandler ODA rv=%x", self, rv));
+      if (NS_FAILED(rv)) {
+        self->mBrotli->mStatus = rv;
+        return self->mBrotli->mStatus;
+      }
+    }
+
+    if (res == BROTLI_RESULT_SUCCESS ||
+        res == BROTLI_RESULT_NEEDS_MORE_INPUT) {
+      *countRead = aAvail;
+      return NS_OK;
+    }
+    MOZ_ASSERT (res == BROTLI_RESULT_NEEDS_MORE_OUTPUT);
+  } while (res == BROTLI_RESULT_NEEDS_MORE_OUTPUT);
+
+  self->mBrotli->mStatus = NS_ERROR_UNEXPECTED;
+  return self->mBrotli->mStatus;
+}
+
+NS_IMETHODIMP
+nsHTTPCompressConv::OnDataAvailable(nsIRequest* request,
+                                    nsISupports *aContext,
+                                    nsIInputStream *iStr,
+                                    uint64_t aSourceOffset,
+                                    uint32_t aCount)
+{
+  nsresult rv = NS_ERROR_INVALID_CONTENT_ENCODING;
+  uint32_t streamLen = aCount;
+  LOG(("nsHttpCompressConv %p OnDataAvailable %d", this, aCount));
+
+  if (streamLen == 0) {
+    NS_ERROR("count of zero passed to OnDataAvailable");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  if (mStreamEnded) {
+    // Hmm... this may just indicate that the data stream is done and that
+    // what's left is either metadata or padding of some sort.... throwing
+    // it out is probably the safe thing to do.
+    uint32_t n;
+    return iStr->ReadSegments(NS_DiscardSegment, nullptr, streamLen, &n);
+  }
+
+  switch (mMode) {
+  case HTTP_COMPRESS_GZIP:
+    streamLen = check_header(iStr, streamLen, &rv);
+
+    if (rv != NS_OK) {
+      return rv;
+    }
+
+    if (streamLen == 0) {
+      return NS_OK;
+    }
+
+    MOZ_FALLTHROUGH;
+
+  case HTTP_COMPRESS_DEFLATE:
+
+    if (mInpBuffer != nullptr && streamLen > mInpBufferLen) {
+      mInpBuffer = (unsigned char *) realloc(mInpBuffer, mInpBufferLen = streamLen);
+
+      if (mOutBufferLen < streamLen * 2) {
+        mOutBuffer = (unsigned char *) realloc(mOutBuffer, mOutBufferLen = streamLen * 3);
+      }
+
+      if (mInpBuffer == nullptr || mOutBuffer == nullptr) {
+        return NS_ERROR_OUT_OF_MEMORY;
+      }
+    }
+
+    if (mInpBuffer == nullptr) {
+      mInpBuffer = (unsigned char *) malloc(mInpBufferLen = streamLen);
+    }
+
+    if (mOutBuffer == nullptr) {
+      mOutBuffer = (unsigned char *) malloc(mOutBufferLen = streamLen * 3);
+    }
+
+    if (mInpBuffer == nullptr || mOutBuffer == nullptr) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    uint32_t unused;
+    iStr->Read((char *)mInpBuffer, streamLen, &unused);
+
+    if (mMode == HTTP_COMPRESS_DEFLATE) {
+      if (!mStreamInitialized) {
+        memset(&d_stream, 0, sizeof (d_stream));
+
+        if (inflateInit(&d_stream) != Z_OK) {
+          return NS_ERROR_FAILURE;
+        }
+
+        mStreamInitialized = true;
+      }
+      d_stream.next_in = mInpBuffer;
+      d_stream.avail_in = (uInt)streamLen;
+
+      mDummyStreamInitialised = false;
+      for (;;) {
+        d_stream.next_out = mOutBuffer;
+        d_stream.avail_out = (uInt)mOutBufferLen;
+
+        int code = inflate(&d_stream, Z_NO_FLUSH);
+        unsigned bytesWritten = (uInt)mOutBufferLen - d_stream.avail_out;
+
+        if (code == Z_STREAM_END) {
+          if (bytesWritten) {
+            rv = do_OnDataAvailable(request, aContext, aSourceOffset, (char *)mOutBuffer, bytesWritten);
+            if (NS_FAILED (rv)) {
+              return rv;
+            }
+          }
+
+          inflateEnd(&d_stream);
+          mStreamEnded = true;
+          break;
+        } else if (code == Z_OK) {
+          if (bytesWritten) {
+            rv = do_OnDataAvailable(request, aContext, aSourceOffset, (char *)mOutBuffer, bytesWritten);
+            if (NS_FAILED (rv)) {
+              return rv;
+            }
+          }
+        } else if (code == Z_BUF_ERROR) {
+          if (bytesWritten) {
+            rv = do_OnDataAvailable(request, aContext, aSourceOffset, (char *)mOutBuffer, bytesWritten);
+            if (NS_FAILED (rv)) {
+              return rv;
+            }
+          }
+          break;
+        } else if (code == Z_DATA_ERROR) {
+          // some servers (notably Apache with mod_deflate) don't generate zlib headers
+          // insert a dummy header and try again
+          static char dummy_head[2] =
+            {
+              0x8 + 0x7 * 0x10,
+              (((0x8 + 0x7 * 0x10) * 0x100 + 30) / 31 * 31) & 0xFF,
+            };
+          inflateReset(&d_stream);
+          d_stream.next_in = (Bytef*) dummy_head;
+          d_stream.avail_in = sizeof(dummy_head);
+
+          code = inflate(&d_stream, Z_NO_FLUSH);
+          if (code != Z_OK) {
+            return NS_ERROR_FAILURE;
+          }
+
+          // stop an endless loop caused by non-deflate data being labelled as deflate
+          if (mDummyStreamInitialised) {
+            NS_WARNING("endless loop detected"
+                       " - invalid deflate");
+            return NS_ERROR_INVALID_CONTENT_ENCODING;
+          }
+          mDummyStreamInitialised = true;
+          // reset stream pointers to our original data
+          d_stream.next_in = mInpBuffer;
+          d_stream.avail_in = (uInt)streamLen;
+        } else {
+          return NS_ERROR_INVALID_CONTENT_ENCODING;
+        }
+      } /* for */
+    } else {
+      if (!mStreamInitialized) {
+        memset(&d_stream, 0, sizeof (d_stream));
+
+        if (inflateInit2(&d_stream, -MAX_WBITS) != Z_OK) {
+          return NS_ERROR_FAILURE;
+        }
+
+        mStreamInitialized = true;
+      }
+
+      d_stream.next_in  = mInpBuffer;
+      d_stream.avail_in = (uInt)streamLen;
+
+      for (;;) {
+        d_stream.next_out  = mOutBuffer;
+        d_stream.avail_out = (uInt)mOutBufferLen;
+
+        int code = inflate (&d_stream, Z_NO_FLUSH);
+        unsigned bytesWritten = (uInt)mOutBufferLen - d_stream.avail_out;
+
+        if (code == Z_STREAM_END) {
+          if (bytesWritten) {
+            rv = do_OnDataAvailable(request, aContext, aSourceOffset, (char *)mOutBuffer, bytesWritten);
+            if (NS_FAILED (rv)) {
+              return rv;
+            }
+          }
+
+          inflateEnd(&d_stream);
+          mStreamEnded = true;
+          break;
+        } else if (code == Z_OK) {
+          if (bytesWritten) {
+            rv = do_OnDataAvailable(request, aContext, aSourceOffset, (char *)mOutBuffer, bytesWritten);
+            if (NS_FAILED (rv)) {
+              return rv; 
+            }
+          }
+        } else if (code == Z_BUF_ERROR) {
+          if (bytesWritten) {
+            rv = do_OnDataAvailable(request, aContext, aSourceOffset, (char *)mOutBuffer, bytesWritten);
+            if (NS_FAILED (rv)) {
+              return rv;
+            }
+          }
+          break;
+        } else {
+          return NS_ERROR_INVALID_CONTENT_ENCODING;
+        }
+      } /* for */
+    } /* gzip */
+    break;
+
+  case HTTP_COMPRESS_BROTLI:
+  {
+    if (!mBrotli) {
+      mBrotli = new BrotliWrapper();
+    }
+
+    mBrotli->mRequest = request;
+    mBrotli->mContext = aContext;
+    mBrotli->mSourceOffset = aSourceOffset;
+
+    uint32_t countRead;
+    rv = iStr->ReadSegments(BrotliHandler, this, streamLen, &countRead);
+    if (NS_SUCCEEDED(rv)) {
+      rv = mBrotli->mStatus;
+    }
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+    break;
+
+  default:
+    rv = mListener->OnDataAvailable(request, aContext, iStr, aSourceOffset, aCount);
+    if (NS_FAILED (rv)) {
+      return rv;
+    }
+  } /* switch */
+
+  return NS_OK;
+} /* OnDataAvailable */
+
+// XXX/ruslan: need to implement this too
+
+NS_IMETHODIMP
+nsHTTPCompressConv::Convert(nsIInputStream *aFromStream,
+                            const char *aFromType,
+                            const char *aToType,
+                            nsISupports *aCtxt,
+                            nsIInputStream **_retval)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+nsresult
+nsHTTPCompressConv::do_OnDataAvailable(nsIRequest* request,
+                                       nsISupports *context, uint64_t offset,
+                                       const char *buffer, uint32_t count)
+{
+  if (!mStream) {
+    mStream = do_CreateInstance(NS_STRINGINPUTSTREAM_CONTRACTID);
+    NS_ENSURE_STATE(mStream);
+  }
+
+  mStream->ShareData(buffer, count);
+
+  nsresult rv = mListener->OnDataAvailable(request, context, mStream,
+                                           offset, count);
+
+  // Make sure the stream no longer references |buffer| in case our listener
+  // is crazy enough to try to read from |mStream| after ODA.
+  mStream->ShareData("", 0);
+  mDecodedDataLength += count;
+
+  return rv;
+}
+
+#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
+#define HEAD_CRC     0x02 /* bit 1 set: header CRC present */
+#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
+#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
+#define COMMENT      0x10 /* bit 4 set: file comment present */
+#define RESERVED     0xE0 /* bits 5..7: reserved */
+
+static unsigned gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
+
+uint32_t
+nsHTTPCompressConv::check_header(nsIInputStream *iStr, uint32_t streamLen, nsresult *rs)
+{
+  enum  { GZIP_INIT = 0, GZIP_OS, GZIP_EXTRA0, GZIP_EXTRA1, GZIP_EXTRA2, GZIP_ORIG, GZIP_COMMENT, GZIP_CRC };
+  char c;
+
+  *rs = NS_OK;
+
+  if (mCheckHeaderDone) {
+    return streamLen;
+  }
+
+  while (streamLen) {
+    switch (hMode) {
+    case GZIP_INIT:
+      uint32_t unused;
+      iStr->Read(&c, 1, &unused);
+      streamLen--;
+
+      if (mSkipCount == 0 && ((unsigned)c & 0377) != gz_magic[0]) {
+        *rs = NS_ERROR_INVALID_CONTENT_ENCODING;
+        return 0;
+      }
+
+      if (mSkipCount == 1 && ((unsigned)c & 0377) != gz_magic[1]) {
+        *rs = NS_ERROR_INVALID_CONTENT_ENCODING;
+        return 0;
+      }
+
+      if (mSkipCount == 2 && ((unsigned)c & 0377) != Z_DEFLATED) {
+        *rs = NS_ERROR_INVALID_CONTENT_ENCODING;
+        return 0;
+      }
+
+      mSkipCount++;
+      if (mSkipCount == 4) {
+        mFlags = (unsigned) c & 0377;
+        if (mFlags & RESERVED) {
+          *rs = NS_ERROR_INVALID_CONTENT_ENCODING;
+          return 0;
+        }
+        hMode = GZIP_OS;
+        mSkipCount = 0;
+      }
+      break;
+
+    case GZIP_OS:
+      iStr->Read(&c, 1, &unused);
+      streamLen--;
+      mSkipCount++;
+
+      if (mSkipCount == 6) {
+        hMode = GZIP_EXTRA0;
+      }
+      break;
+
+    case GZIP_EXTRA0:
+      if (mFlags & EXTRA_FIELD) {
+        iStr->Read(&c, 1, &unused);
+        streamLen--;
+        mLen = (uInt) c & 0377;
+        hMode = GZIP_EXTRA1;
+      } else {
+        hMode = GZIP_ORIG;
+      }
+      break;
+
+    case GZIP_EXTRA1:
+      iStr->Read(&c, 1, &unused);
+      streamLen--;
+      mLen |= ((uInt) c & 0377) << 8;
+      mSkipCount = 0;
+      hMode = GZIP_EXTRA2;
+      break;
+
+    case GZIP_EXTRA2:
+      if (mSkipCount == mLen) {
+        hMode = GZIP_ORIG;
+      } else {
+        iStr->Read(&c, 1, &unused);
+        streamLen--;
+        mSkipCount++;
+      }
+      break;
+
+    case GZIP_ORIG:
+      if (mFlags & ORIG_NAME) {
+        iStr->Read(&c, 1, &unused);
+        streamLen--;
+        if (c == 0)
+          hMode = GZIP_COMMENT;
+      } else {
+        hMode = GZIP_COMMENT;
+      }
+      break;
+
+    case GZIP_COMMENT:
+      if (mFlags & COMMENT) {
+        iStr->Read(&c, 1, &unused);
+        streamLen--;
+        if (c == 0) {
+          hMode = GZIP_CRC;
+          mSkipCount = 0;
+        }
+      } else {
+        hMode = GZIP_CRC;
+        mSkipCount = 0;
+      }
+      break;
+
+    case GZIP_CRC:
+      if (mFlags & HEAD_CRC) {
+        iStr->Read(&c, 1, &unused);
+        streamLen--;
+        mSkipCount++;
+        if (mSkipCount == 2) {
+          mCheckHeaderDone = true;
+          return streamLen;
+        }
+      } else {
+        mCheckHeaderDone = true;
+        return streamLen;
+      }
+      break;
+    }
+  }
+  return streamLen;
+}
+
+} // namespace net
+} // namespace mozilla
+
+nsresult
+NS_NewHTTPCompressConv(mozilla::net::nsHTTPCompressConv **aHTTPCompressConv)
+{
+  NS_PRECONDITION(aHTTPCompressConv != nullptr, "null ptr");
+  if (!aHTTPCompressConv) {
+    return NS_ERROR_NULL_POINTER;
+  }
+
+  RefPtr<mozilla::net::nsHTTPCompressConv> outVal =
+    new mozilla::net::nsHTTPCompressConv();
+  if (!outVal) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  outVal.forget(aHTTPCompressConv);
+  return NS_OK;
+}