libcef:

- Add support for embedded netscape-style plugins.
- Add new webkit_glue VisitedLinkHash() and IsLinkVisited() functions required by underlying chromium changes.
cefclient:
- Add sample netscape-style plugin implementation and related Plugin item on the Tests menu.
- Increase the speed of the update timer so that buttons refresh closer to real-time.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@5 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/plugins/browser_plugin_stream.cc

@@ -0,0 +1,247 @@
+// Copyright (c) 2008 The Chromium Embedded Framework Authors.
+// Portions copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// TODO : Support NP_ASFILEONLY mode
+// TODO : Support NP_SEEK mode
+// TODO : Support SEEKABLE=true in NewStream
+
+#include "precompiled_libcef.h"
+#include "browser_plugin_stream.h"
+#include "browser_plugin_instance.h"
+
+#include "base/string_util.h"
+#include "base/message_loop.h"
+#include "webkit/glue/webkit_glue.h"
+#include "googleurl/src/gurl.h"
+
+namespace NPAPI {
+
+BrowserPluginStream::~BrowserPluginStream() {
+  // always close our temporary files.
+  CloseTempFile();
+  free(const_cast<char*>(stream_.url));
+}
+
+bool BrowserPluginStream::Open(const std::string &mime_type,
+                               const std::string &headers,
+                               uint32 length,
+                               uint32 last_modified) {
+  headers_ = headers;
+  NPP id = instance_->npp();
+  stream_.end = length;
+  stream_.lastmodified = last_modified;
+  stream_.pdata = 0;
+  stream_.ndata = id->ndata;
+  stream_.notifyData = notify_data_;
+
+  bool seekable_stream = false;
+  if (!headers_.empty()) {
+    stream_.headers = headers_.c_str();
+    if (headers_.find("Accept-Ranges: bytes") != std::string::npos) {
+      seekable_stream = true;
+    }
+  }
+
+  const char *char_mime_type = "application/x-unknown-content-type";
+  std::string temp_mime_type;
+  if (!mime_type.empty()) {
+    char_mime_type = mime_type.c_str();
+  } else {
+    GURL gurl(stream_.url);
+    std::wstring path(UTF8ToWide(gurl.path()));
+    if (webkit_glue::GetMimeTypeFromFile(path, &temp_mime_type))
+      char_mime_type = temp_mime_type.c_str();
+  }
+
+  // Silverlight expects a valid mime type
+  DCHECK(strlen(char_mime_type) != 0);
+  NPError err = instance_->NPP_NewStream((NPMIMEType)char_mime_type,
+                                         &stream_, seekable_stream,
+                                         &requested_plugin_mode_);
+  if (err != NPERR_NO_ERROR) {
+    Notify(err);
+    return false;
+  }
+
+  opened_ = true;
+
+  if (requested_plugin_mode_ == NP_SEEK) {
+    seekable_stream_ = true;
+  }
+  // If the plugin has requested certain modes, then we need a copy
+  // of this file on disk.  Open it and save it as we go.
+  if (requested_plugin_mode_ == NP_ASFILEONLY ||
+    requested_plugin_mode_ == NP_ASFILE) {
+    if (OpenTempFile() == false)
+      return false;
+  }
+
+  mime_type_ = char_mime_type;
+  return true;
+}
+
+int BrowserPluginStream::Write(const char *buffer, const int length,
+                               int data_offset) {
+  // There may be two streams to write to - the plugin and the file.
+  // It is unclear what to do if we cannot write to both.  The rules of
+  // this function are that the plugin must consume at least as many
+  // bytes as returned by the WriteReady call.  So, we will attempt to
+  // write that many to both streams.  If we can't write that many bytes
+  // to each stream, we'll return failure.
+
+  DCHECK(opened_);
+  if (WriteToFile(buffer, length) &&
+      WriteToPlugin(buffer, length, data_offset))
+    return length;
+
+  return -1;
+}
+
+bool BrowserPluginStream::WriteToFile(const char *buf, size_t length) {
+  // For ASFILEONLY, ASFILE, and SEEK modes, we need to write
+  // to the disk
+  if (TempFileIsValid() &&
+      (requested_plugin_mode_ == NP_ASFILE ||
+       requested_plugin_mode_ == NP_ASFILEONLY) ) {
+    size_t totalBytesWritten = 0, bytes;
+    do {
+      bytes = WriteBytes(buf, length);
+      totalBytesWritten += bytes;
+    } while (bytes > 0U && totalBytesWritten < length);
+
+    if (totalBytesWritten != length)
+      return false;
+  }
+
+  return true;
+}
+
+bool BrowserPluginStream::WriteToPlugin(const char *buf, const int length,
+                                        const int data_offset) {
+  // For NORMAL and ASFILE modes, we send the data to the plugin now
+  if (requested_plugin_mode_ != NP_NORMAL &&
+      requested_plugin_mode_ != NP_ASFILE &&
+      requested_plugin_mode_ != NP_SEEK)
+    return true;
+
+  int written = TryWriteToPlugin(buf, length, data_offset);
+  if (written == -1)
+      return false;
+
+  if (written < length) {
+    // Buffer the remaining data.
+    size_t remaining = length - written;
+    size_t previous_size = delivery_data_.size();
+    delivery_data_.resize(previous_size + remaining);
+    data_offset_ = data_offset;
+    memcpy(&delivery_data_[previous_size], buf + written, remaining);
+    MessageLoop::current()->PostTask(FROM_HERE, NewRunnableMethod(
+        this, &BrowserPluginStream::OnDelayDelivery));
+  }
+
+  return true;
+}
+
+void BrowserPluginStream::OnDelayDelivery() {
+  // It is possible that the plugin stream may have closed before the task
+  // was hit.
+  if (!opened_) {
+    return;
+  }
+
+  int size = static_cast<int>(delivery_data_.size());
+  int written = TryWriteToPlugin(&delivery_data_.front(), size,
+                                 data_offset_);
+  if (written > 0) {
+    // Remove the data that we already wrote.
+    delivery_data_.erase(delivery_data_.begin(),
+                         delivery_data_.begin() + written);
+  }
+}
+
+int BrowserPluginStream::TryWriteToPlugin(const char *buf, const int length,
+                                          const int data_offset) {
+  int byte_offset = 0;
+
+  if (data_offset > 0)
+    data_offset_ = data_offset;
+
+  while (byte_offset < length) {
+    int bytes_remaining = length - byte_offset;
+    int bytes_to_write = instance_->NPP_WriteReady(&stream_);
+    if (bytes_to_write > bytes_remaining)
+      bytes_to_write = bytes_remaining;
+
+    if (bytes_to_write == 0)
+      return byte_offset;
+
+    int bytes_consumed = instance_->NPP_Write(
+        &stream_, data_offset_, bytes_to_write,
+        const_cast<char*>(buf + byte_offset));
+    if (bytes_consumed < 0) {
+      // The plugin failed, which means that we need to close the stream.
+      Close(NPRES_NETWORK_ERR);
+      return -1;
+    }
+    if (bytes_consumed == 0) {
+      // The plugin couldn't take all of the data now.
+      return byte_offset;
+    }
+
+    // The plugin might report more that we gave it.
+    bytes_consumed = std::min(bytes_consumed, bytes_to_write);
+
+    data_offset_ += bytes_consumed;
+    byte_offset += bytes_consumed;
+  }
+
+  if (close_on_write_data_)
+    Close(NPRES_DONE);
+
+  return length;
+}
+
+bool BrowserPluginStream::Close(NPReason reason) {
+  if (opened_ == true) {
+    opened_ = false;
+
+    if (delivery_data_.size()) {
+      if (reason == NPRES_DONE) {
+        // There is more data to be streamed, don't destroy the stream now.
+        close_on_write_data_ = true;
+        return true;
+      } else {
+        // Stop any pending data from being streamed
+        delivery_data_.resize(0);
+      }
+    }
+
+    // If we have a temp file, be sure to close it.
+    // Also, allow the plugin to access it now.
+    if (TempFileIsValid()) {
+      CloseTempFile();
+      WriteAsFile();
+    }
+
+    if (stream_.ndata != NULL) {
+      // Stream hasn't been closed yet.
+      NPError err = instance_->NPP_DestroyStream(&stream_, reason);
+      DCHECK(err == NPERR_NO_ERROR);
+    }
+  }
+
+  Notify(reason);
+  return true;
+}
+
+void BrowserPluginStream::Notify(NPReason reason) {
+  if (notify_needed_) {
+    instance_->NPP_URLNotify(stream_.url, reason, notify_data_);
+    notify_needed_ = false;
+  }
+}
+
+}  // namespace NPAPI
+