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      1 /*
      2  * Copyright (C) 2010 Google Inc.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef FileReaderLoader_h
     32 #define FileReaderLoader_h
     33 
     34 #if ENABLE(BLOB)
     35 
     36 #include "FileError.h"
     37 #include "KURL.h"
     38 #include "TextEncoding.h"
     39 #include "ThreadableLoaderClient.h"
     40 #include <wtf/Forward.h>
     41 #include <wtf/text/WTFString.h>
     42 
     43 namespace WebCore {
     44 
     45 class ArrayBuffer;
     46 class Blob;
     47 class FileReaderLoaderClient;
     48 class ScriptExecutionContext;
     49 class TextResourceDecoder;
     50 class ThreadableLoader;
     51 
     52 class FileReaderLoader : public ThreadableLoaderClient {
     53 public:
     54     enum ReadType {
     55         ReadAsArrayBuffer,
     56         ReadAsBinaryString,
     57         ReadAsText,
     58         ReadAsDataURL
     59     };
     60 
     61     // If client is given, do the loading asynchronously. Otherwise, load synchronously.
     62     FileReaderLoader(ReadType, FileReaderLoaderClient*);
     63     ~FileReaderLoader();
     64 
     65     void start(ScriptExecutionContext*, Blob*);
     66     void cancel();
     67 
     68     // ThreadableLoaderClient
     69     virtual void didReceiveResponse(const ResourceResponse&);
     70     virtual void didReceiveData(const char*, int);
     71     virtual void didFinishLoading(unsigned long, double);
     72     virtual void didFail(const ResourceError&);
     73 
     74     String stringResult();
     75     PassRefPtr<ArrayBuffer> arrayBufferResult() const;
     76     unsigned bytesLoaded() const { return m_bytesLoaded; }
     77     unsigned totalBytes() const { return m_totalBytes; }
     78     int errorCode() const { return m_errorCode; }
     79 
     80     void setEncoding(const String&);
     81     void setDataType(const String& dataType) { m_dataType = dataType; }
     82 
     83 private:
     84     void terminate();
     85     void cleanup();
     86     void failed(int errorCode);
     87     void convertToText();
     88     void convertToDataURL();
     89 
     90     bool isCompleted() const;
     91 
     92     static FileError::ErrorCode httpStatusCodeToErrorCode(int);
     93 
     94     ReadType m_readType;
     95     FileReaderLoaderClient* m_client;
     96     TextEncoding m_encoding;
     97     String m_dataType;
     98 
     99     KURL m_urlForReading;
    100     RefPtr<ThreadableLoader> m_loader;
    101 
    102     RefPtr<ArrayBuffer> m_rawData;
    103     bool m_isRawDataConverted;
    104 
    105     String m_stringResult;
    106 
    107     // The decoder used to decode the text data.
    108     RefPtr<TextResourceDecoder> m_decoder;
    109 
    110     unsigned m_bytesLoaded;
    111     unsigned m_totalBytes;
    112     int m_errorCode;
    113 };
    114 
    115 } // namespace WebCore
    116 
    117 #endif // ENABLE(BLOB)
    118 
    119 #endif // FileReaderLoader_h
    120