1 files changed, 158 insertions, 0 deletions
diff --git a/modules/libjar/zipwriter/nsZipDataStream.cpp b/modules/libjar/zipwriter/nsZipDataStream.cpp
new file mode 100644
index 0000000000..97bfda5a63
--- /dev/null
+++ b/modules/libjar/zipwriter/nsZipDataStream.cpp
@@ -0,0 +1,158 @@
+/* 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 "StreamFunctions.h"
+#include "nsZipDataStream.h"
+#include "nsStringStream.h"
+#include "nsISeekableStream.h"
+#include "nsDeflateConverter.h"
+#include "nsNetUtil.h"
+#include "nsComponentManagerUtils.h"
+
+#define ZIP_METHOD_STORE 0
+#define ZIP_METHOD_DEFLATE 8
+
+using namespace mozilla;
+
+/**
+ * nsZipDataStream handles the writing an entry's into the zip file.
+ * It is set up to wither write the data as is, or in the event that compression
+ * has been requested to pass it through a stream converter.
+ * Currently only the deflate compression method is supported.
+ * The CRC checksum for the entry's data is also generated here.
+ */
+NS_IMPL_ISUPPORTS(nsZipDataStream, nsIStreamListener, nsIRequestObserver)
+
+nsresult nsZipDataStream::Init(nsZipWriter* aWriter, nsIOutputStream* aStream,
+                               nsZipHeader* aHeader, int32_t aCompression) {
+  mWriter = aWriter;
+  mHeader = aHeader;
+  mStream = aStream;
+  mHeader->mCRC = crc32(0L, Z_NULL, 0);
+
+  nsresult rv =
+      NS_NewSimpleStreamListener(getter_AddRefs(mOutput), aStream, nullptr);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (aCompression > 0) {
+    mHeader->mMethod = ZIP_METHOD_DEFLATE;
+    nsCOMPtr<nsIStreamConverter> converter =
+        new nsDeflateConverter(aCompression);
+    NS_ENSURE_TRUE(converter, NS_ERROR_OUT_OF_MEMORY);
+
+    rv = converter->AsyncConvertData("uncompressed", "rawdeflate", mOutput,
+                                     nullptr);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    mOutput = converter;
+  } else {
+    mHeader->mMethod = ZIP_METHOD_STORE;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsZipDataStream::OnDataAvailable(nsIRequest* aRequest,
+                                               nsIInputStream* aInputStream,
+                                               uint64_t aOffset,
+                                               uint32_t aCount) {
+  if (!mOutput) return NS_ERROR_NOT_INITIALIZED;
+
+  auto buffer = MakeUnique<char[]>(aCount);
+  NS_ENSURE_TRUE(buffer, NS_ERROR_OUT_OF_MEMORY);
+
+  nsresult rv = ZW_ReadData(aInputStream, buffer.get(), aCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return ProcessData(aRequest, nullptr, buffer.get(), aOffset, aCount);
+}
+
+NS_IMETHODIMP nsZipDataStream::OnStartRequest(nsIRequest* aRequest) {
+  if (!mOutput) return NS_ERROR_NOT_INITIALIZED;
+
+  return mOutput->OnStartRequest(aRequest);
+}
+
+NS_IMETHODIMP nsZipDataStream::OnStopRequest(nsIRequest* aRequest,
+                                             nsresult aStatusCode) {
+  if (!mOutput) return NS_ERROR_NOT_INITIALIZED;
+
+  nsresult rv = mOutput->OnStopRequest(aRequest, aStatusCode);
+  mOutput = nullptr;
+  if (NS_FAILED(rv)) {
+    mWriter->EntryCompleteCallback(mHeader, rv);
+  } else {
+    rv = CompleteEntry();
+    rv = mWriter->EntryCompleteCallback(mHeader, rv);
+  }
+
+  mStream = nullptr;
+  mWriter = nullptr;
+  mHeader = nullptr;
+
+  return rv;
+}
+
+inline nsresult nsZipDataStream::CompleteEntry() {
+  nsresult rv;
+  nsCOMPtr<nsISeekableStream> seekable = do_QueryInterface(mStream, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  int64_t pos;
+  rv = seekable->Tell(&pos);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mHeader->mCSize = pos - mHeader->mOffset - mHeader->GetFileHeaderLength();
+  mHeader->mWriteOnClose = true;
+  return NS_OK;
+}
+
+nsresult nsZipDataStream::ProcessData(nsIRequest* aRequest,
+                                      nsISupports* aContext, char* aBuffer,
+                                      uint64_t aOffset, uint32_t aCount) {
+  mHeader->mCRC = crc32(
+      mHeader->mCRC, reinterpret_cast<const unsigned char*>(aBuffer), aCount);
+
+  MOZ_ASSERT(aCount <= INT32_MAX);
+  nsCOMPtr<nsIInputStream> stream;
+  nsresult rv = NS_NewByteInputStream(
+      getter_AddRefs(stream), Span(aBuffer, aCount), NS_ASSIGNMENT_DEPEND);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = mOutput->OnDataAvailable(aRequest, stream, aOffset, aCount);
+  mHeader->mUSize += aCount;
+
+  return rv;
+}
+
+nsresult nsZipDataStream::ReadStream(nsIInputStream* aStream) {
+  if (!mOutput) return NS_ERROR_NOT_INITIALIZED;
+
+  nsresult rv = OnStartRequest(nullptr);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  auto buffer = MakeUnique<char[]>(4096);
+  NS_ENSURE_TRUE(buffer, NS_ERROR_OUT_OF_MEMORY);
+
+  uint32_t read = 0;
+  uint32_t offset = 0;
+  do {
+    rv = aStream->Read(buffer.get(), 4096, &read);
+    if (NS_FAILED(rv)) {
+      OnStopRequest(nullptr, rv);
+      return rv;
+    }
+
+    if (read > 0) {
+      rv = ProcessData(nullptr, nullptr, buffer.get(), offset, read);
+      if (NS_FAILED(rv)) {
+        OnStopRequest(nullptr, rv);
+        return rv;
+      }
+      offset += read;
+    }
+  } while (read > 0);
+
+  return OnStopRequest(nullptr, NS_OK);
+}