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authorBo Xu <bo_xu@foxitsoftware.com>2014-10-28 23:03:33 -0700
committerBo Xu <bo_xu@foxitsoftware.com>2014-11-03 11:10:11 -0800
commitfdc00a7042d912aafaabddae4d9c84199921ef23 (patch)
tree32ab8ac91cc68d2cd15b9168782a71b3f3f5e7b9 /xfa_test/pdf/document_loader.h
parente9b38fa38de2c95d8260be31c57d9272c4d127ed (diff)
downloadpdfium-fdc00a7042d912aafaabddae4d9c84199921ef23.tar.xz
Merge XFA to PDFium master at 4dc95e7 on 10/28/2014
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+// Copyright (c) 2010 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.
+
+#ifndef PDF_DOCUMENT_LOADER_H_
+#define PDF_DOCUMENT_LOADER_H_
+
+#include <list>
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "pdf/chunk_stream.h"
+#include "ppapi/cpp/url_loader.h"
+#include "ppapi/utility/completion_callback_factory.h"
+
+#define kDefaultRequestSize 32768u
+
+namespace chrome_pdf {
+
+class DocumentLoader {
+ public:
+ class Client {
+ public:
+ // Gets the pp::Instance object.
+ virtual pp::Instance* GetPluginInstance() = 0;
+ // Creates new URLLoader based on client settings.
+ virtual pp::URLLoader CreateURLLoader() = 0;
+ // Notification called when partial information about document is available.
+ // Only called for urls that returns full content size and supports byte
+ // range requests.
+ virtual void OnPartialDocumentLoaded() = 0;
+ // Notification called when all outstanding pending requests are complete.
+ virtual void OnPendingRequestComplete() = 0;
+ // Notification called when new data is available.
+ virtual void OnNewDataAvailable() = 0;
+ // Notification called when document is fully loaded.
+ virtual void OnDocumentComplete() = 0;
+ };
+
+ explicit DocumentLoader(Client* client);
+ virtual ~DocumentLoader();
+
+ bool Init(const pp::URLLoader& loader,
+ const std::string& url,
+ const std::string& headers);
+
+ // Data access interface. Return true is sucessful.
+ bool GetBlock(uint32 position, uint32 size, void* buf) const;
+
+ // Data availability interface. Return true data avaialble.
+ bool IsDataAvailable(uint32 position, uint32 size) const;
+
+ // Data availability interface. Return true data avaialble.
+ void RequestData(uint32 position, uint32 size);
+
+ bool IsDocumentComplete() const;
+ uint32 document_size() const { return document_size_; }
+
+ // Return number of bytes available.
+ uint32 GetAvailableData() const;
+
+ // Clear pending requests from the queue.
+ void ClearPendingRequests();
+
+ bool is_partial_document() { return partial_document_; }
+
+ private:
+ // Called by the completion callback of the document's URLLoader.
+ void DidOpen(int32_t result);
+ // Call to read data from the document's URLLoader.
+ void ReadMore();
+ // Called by the completion callback of the document's URLLoader.
+ void DidRead(int32_t result);
+
+ // If the headers have a byte-range response, writes the start and end
+ // positions and returns true if at least the start position was parsed.
+ // The end position will be set to 0 if it was not found or parsed from the
+ // response.
+ // Returns false if not even a start position could be parsed.
+ static bool GetByteRange(const std::string& headers, uint32* start,
+ uint32* end);
+
+ // If the headers have a multi-part response, returns the boundary name.
+ // Otherwise returns an empty string.
+ static std::string GetMultiPartBoundary(const std::string& headers);
+
+ // Called when we detect that partial document load is possible.
+ void LoadPartialDocument();
+ // Called when we have to load full document.
+ void LoadFullDocument();
+ // Download pending requests.
+ void DownloadPendingRequests();
+ // Called when we complete server request and read all data from it.
+ void ReadComplete();
+ // Creates request to download size byte of data data starting from position.
+ pp::URLRequestInfo GetRequest(uint32 position, uint32 size) const;
+ // Returns current request size in bytes.
+ uint32 GetRequestSize() const;
+
+ Client* client_;
+ std::string url_;
+ pp::URLLoader loader_;
+ pp::CompletionCallbackFactory<DocumentLoader> loader_factory_;
+ ChunkStream chunk_stream_;
+ bool partial_document_;
+ bool request_pending_;
+ typedef std::list<std::pair<size_t, size_t> > PendingRequests;
+ PendingRequests pending_requests_;
+ char buffer_[kDefaultRequestSize];
+ uint32 current_pos_;
+ uint32 current_chunk_size_;
+ uint32 current_chunk_read_;
+ uint32 document_size_;
+ bool header_request_;
+ bool is_multipart_;
+ std::string multipart_boundary_;
+ uint32 requests_count_;
+ std::list<std::vector<unsigned char> > chunk_buffer_;
+};
+
+} // namespace chrome_pdf
+
+#endif // PDF_DOCUMENT_LOADER_H_