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, 746 insertions, 0 deletions

diff --git a/netwerk/streamconv/converters/nsHTTPCompressConv.cpp b/netwerk/streamconv/converters/nsHTTPCompressConv.cpp
new file mode 100644
index 0000000000..b5c58b9754
--- /dev/null
+++ b/netwerk/streamconv/converters/nsHTTPCompressConv.cpp
@@ -0,0 +1,746 @@
+/* -*- 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 "nsCOMPtr.h"
+#include "nsCRT.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"
+#include "mozilla/UniquePtrExtensions.h"
+
+// brotli headers
+#undef assert
+#include "assert.h"
+#include "state.h"
+#include "brotli/decode.h"
+
+namespace mozilla {
+namespace net {
+
+extern LazyLogModule gHttpLog;
+#define LOG(args) \
+  MOZ_LOG(mozilla::net::gHttpLog, mozilla::LogLevel::Debug, args)
+
+class BrotliWrapper {
+ public:
+  BrotliWrapper() {
+    BrotliDecoderStateInit(&mState, nullptr, nullptr, nullptr);
+  }
+  ~BrotliWrapper() { BrotliDecoderStateCleanup(&mState); }
+
+  BrotliDecoderState mState{};
+  Atomic<size_t, Relaxed> mTotalOut{0};
+  nsresult mStatus = NS_OK;
+  Atomic<bool, Relaxed> mBrotliStateIsStreamEnd{false};
+
+  nsIRequest* mRequest{nullptr};
+  nsISupports* mContext{nullptr};
+  uint64_t mSourceOffset{0};
+};
+
+// nsISupports implementation
+NS_IMPL_ISUPPORTS(nsHTTPCompressConv, nsIStreamConverter, nsIStreamListener,
+                  nsIRequestObserver, nsICompressConvStats,
+                  nsIThreadRetargetableStreamListener)
+
+// nsFTPDirListingConv methods
+nsHTTPCompressConv::nsHTTPCompressConv() {
+  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 (!nsCRT::strncasecmp(aFromType, HTTP_COMPRESS_TYPE,
+                          sizeof(HTTP_COMPRESS_TYPE) - 1) ||
+      !nsCRT::strncasecmp(aFromType, HTTP_X_COMPRESS_TYPE,
+                          sizeof(HTTP_X_COMPRESS_TYPE) - 1)) {
+    mMode = HTTP_COMPRESS_COMPRESS;
+  } else if (!nsCRT::strncasecmp(aFromType, HTTP_GZIP_TYPE,
+                                 sizeof(HTTP_GZIP_TYPE) - 1) ||
+             !nsCRT::strncasecmp(aFromType, HTTP_X_GZIP_TYPE,
+                                 sizeof(HTTP_X_GZIP_TYPE) - 1)) {
+    mMode = HTTP_COMPRESS_GZIP;
+  } else if (!nsCRT::strncasecmp(aFromType, HTTP_DEFLATE_TYPE,
+                                 sizeof(HTTP_DEFLATE_TYPE) - 1)) {
+    mMode = HTTP_COMPRESS_DEFLATE;
+  } else if (!nsCRT::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, (CompressMode)mMode));
+
+  MutexAutoLock lock(mMutex);
+  // hook ourself up with the receiving listener.
+  mListener = aListener;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsHTTPCompressConv::GetConvertedType(const nsACString& aFromType,
+                                     nsIChannel* aChannel,
+                                     nsACString& aToType) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsHTTPCompressConv::OnStartRequest(nsIRequest* request) {
+  LOG(("nsHttpCompresssConv %p onstart\n", this));
+  nsCOMPtr<nsIStreamListener> listener;
+  {
+    MutexAutoLock lock(mMutex);
+    listener = mListener;
+  }
+  return listener->OnStartRequest(request);
+}
+
+NS_IMETHODIMP
+nsHTTPCompressConv::OnStopRequest(nsIRequest* request, nsresult aStatus) {
+  nsresult status = aStatus;
+  LOG(("nsHttpCompresssConv %p onstop %" PRIx32 "\n", this,
+       static_cast<uint32_t>(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) &&
+        !mBrotli->mBrotliStateIsStreamEnd) {
+      status = NS_ERROR_INVALID_CONTENT_ENCODING;
+    }
+    LOG(("nsHttpCompresssConv %p onstop brotlihandler rv %" PRIx32 "\n", this,
+         static_cast<uint32_t>(status)));
+    if (fpChannel && !isPending) {
+      fpChannel->ForcePending(false);
+    }
+  }
+
+  nsCOMPtr<nsIStreamListener> listener;
+  {
+    MutexAutoLock lock(mMutex);
+    listener = mListener;
+  }
+  return listener->OnStopRequest(request, 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;
+  BrotliDecoderResult 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 %zu\n", self, avail));
+    size_t totalOut = self->mBrotli->mTotalOut;
+    res = ::BrotliDecoderDecompressStream(
+        &self->mBrotli->mState, &avail,
+        reinterpret_cast<const unsigned char**>(&dataIn), &outSize, &outPtr,
+        &totalOut);
+    outSize = kOutSize - outSize;
+    self->mBrotli->mTotalOut = totalOut;
+    self->mBrotli->mBrotliStateIsStreamEnd =
+        BrotliDecoderIsFinished(&self->mBrotli->mState);
+    LOG(("nsHttpCompresssConv %p brotlihandler decompress rv=%" PRIx32
+         " out=%zu\n",
+         self, static_cast<uint32_t>(res), outSize));
+
+    if (res == BROTLI_DECODER_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_DECODER_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;
+      }
+    }
+
+    auto callOnDataAvailable = [&](uint64_t aSourceOffset, const char* aBuffer,
+                                   uint32_t aCount) {
+      nsresult rv = self->do_OnDataAvailable(self->mBrotli->mRequest,
+                                             aSourceOffset, aBuffer, aCount);
+      LOG(("nsHttpCompressConv %p BrotliHandler ODA rv=%" PRIx32, self,
+           static_cast<uint32_t>(rv)));
+      if (NS_FAILED(rv)) {
+        self->mBrotli->mStatus = rv;
+      }
+
+      return rv;
+    };
+
+    if (outSize > 0) {
+      if (NS_FAILED(callOnDataAvailable(
+              self->mBrotli->mSourceOffset,
+              reinterpret_cast<const char*>(outBuffer.get()), outSize))) {
+        return self->mBrotli->mStatus;
+      }
+    }
+
+    // See bug 1759745. If the decoder has more output data, take it.
+    while (::BrotliDecoderHasMoreOutput(&self->mBrotli->mState)) {
+      outSize = kOutSize;
+      const uint8_t* buffer =
+          ::BrotliDecoderTakeOutput(&self->mBrotli->mState, &outSize);
+      if (NS_FAILED(callOnDataAvailable(self->mBrotli->mSourceOffset,
+                                        reinterpret_cast<const char*>(buffer),
+                                        outSize))) {
+        return self->mBrotli->mStatus;
+      }
+    }
+
+    if (res == BROTLI_DECODER_RESULT_SUCCESS ||
+        res == BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT) {
+      *countRead = aAvail;
+      return NS_OK;
+    }
+    MOZ_ASSERT(res == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT);
+  } while (res == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT);
+
+  self->mBrotli->mStatus = NS_ERROR_UNEXPECTED;
+  return self->mBrotli->mStatus;
+}
+
+NS_IMETHODIMP
+nsHTTPCompressConv::OnDataAvailable(nsIRequest* request, 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;
+      }
+
+      [[fallthrough]];
+
+    case HTTP_COMPRESS_DEFLATE:
+
+      if (mInpBuffer != nullptr && streamLen > mInpBufferLen) {
+        unsigned char* originalInpBuffer = mInpBuffer;
+        if (!(mInpBuffer = (unsigned char*)realloc(
+                  originalInpBuffer, mInpBufferLen = streamLen))) {
+          free(originalInpBuffer);
+        }
+
+        if (mOutBufferLen < streamLen * 2) {
+          unsigned char* originalOutBuffer = mOutBuffer;
+          if (!(mOutBuffer = (unsigned char*)realloc(
+                    mOutBuffer, mOutBufferLen = streamLen * 3))) {
+            free(originalOutBuffer);
+          }
+        }
+
+        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, aSourceOffset, (char*)mOutBuffer,
+                                      bytesWritten);
+              if (NS_FAILED(rv)) {
+                return rv;
+              }
+            }
+
+            inflateEnd(&d_stream);
+            mStreamEnded = true;
+            break;
+          }
+          if (code == Z_OK) {
+            if (bytesWritten) {
+              rv = do_OnDataAvailable(request, aSourceOffset, (char*)mOutBuffer,
+                                      bytesWritten);
+              if (NS_FAILED(rv)) {
+                return rv;
+              }
+            }
+          } else if (code == Z_BUF_ERROR) {
+            if (bytesWritten) {
+              rv = do_OnDataAvailable(request, 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, aSourceOffset, (char*)mOutBuffer,
+                                      bytesWritten);
+              if (NS_FAILED(rv)) {
+                return rv;
+              }
+            }
+
+            inflateEnd(&d_stream);
+            mStreamEnded = true;
+            break;
+          }
+          if (code == Z_OK) {
+            if (bytesWritten) {
+              rv = do_OnDataAvailable(request, aSourceOffset, (char*)mOutBuffer,
+                                      bytesWritten);
+              if (NS_FAILED(rv)) {
+                return rv;
+              }
+            }
+          } else if (code == Z_BUF_ERROR) {
+            if (bytesWritten) {
+              rv = do_OnDataAvailable(request, 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 = MakeUnique<BrotliWrapper>();
+      }
+
+      mBrotli->mRequest = request;
+      mBrotli->mContext = nullptr;
+      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:
+      nsCOMPtr<nsIStreamListener> listener;
+      {
+        MutexAutoLock lock(mMutex);
+        listener = mListener;
+      }
+      rv = listener->OnDataAvailable(request, 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,
+                                                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);
+
+  nsCOMPtr<nsIStreamListener> listener;
+  {
+    MutexAutoLock lock(mMutex);
+    listener = mListener;
+  }
+  nsresult rv = listener->OnDataAvailable(request, 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;
+}
+
+NS_IMETHODIMP
+nsHTTPCompressConv::CheckListenerChain() {
+  nsCOMPtr<nsIThreadRetargetableStreamListener> listener;
+  {
+    MutexAutoLock lock(mMutex);
+    listener = do_QueryInterface(mListener);
+  }
+
+  if (!listener) {
+    return NS_ERROR_NO_INTERFACE;
+  }
+
+  return listener->CheckListenerChain();
+}
+
+}  // namespace net
+}  // namespace mozilla
+
+nsresult NS_NewHTTPCompressConv(
+    mozilla::net::nsHTTPCompressConv** aHTTPCompressConv) {
+  MOZ_ASSERT(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;
+}