Source/core/fileapi/FileReaderLoader.h

/*
 * Copyright (C) 2010 Google Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef FileReaderLoader_h
#define FileReaderLoader_h

#include "core/fileapi/FileError.h"
#include "core/loader/ThreadableLoaderClient.h"
#include "weborigin/KURL.h"
#include "wtf/Forward.h"
#include "wtf/text/TextEncoding.h"
#include "wtf/text/WTFString.h"

namespace WebCore {

class BlobDataHandle;
class FileReaderLoaderClient;
class ExecutionContext;
class Stream;
class TextResourceDecoder;
class ThreadableLoader;

class FileReaderLoader : public ThreadableLoaderClient {
public:
    enum ReadType {
        ReadAsArrayBuffer,
        ReadAsBinaryString,
        ReadAsBlob,
        ReadAsText,
        ReadAsDataURL,
        ReadByClient
    };

    // If client is given, do the loading asynchronously. Otherwise, load synchronously.
    FileReaderLoader(ReadType, FileReaderLoaderClient*);
    ~FileReaderLoader();

    void start(ExecutionContext*, PassRefPtr<BlobDataHandle>);
    void start(ExecutionContext*, const Stream&, unsigned readSize);
    void cancel();

    // ThreadableLoaderClient
    virtual void didReceiveResponse(unsigned long, const ResourceResponse&);
    virtual void didReceiveData(const char*, int);
    virtual void didFinishLoading(unsigned long, double);
    virtual void didFail(const ResourceError&);

    String stringResult();
    PassRefPtr<ArrayBuffer> arrayBufferResult() const;
    unsigned bytesLoaded() const { return m_bytesLoaded; }
    unsigned totalBytes() const { return m_totalBytes; }
    FileError::ErrorCode errorCode() const { return m_errorCode; }

    void setEncoding(const String&);
    void setDataType(const String& dataType) { m_dataType = dataType; }

private:
    void startInternal(ExecutionContext*, const Stream*, PassRefPtr<BlobDataHandle>);
    void terminate();
    void cleanup();
    void failed(FileError::ErrorCode);
    void convertToText();
    void convertToDataURL();

    static FileError::ErrorCode httpStatusCodeToErrorCode(int);

    ReadType m_readType;
    FileReaderLoaderClient* m_client;
    WTF::TextEncoding m_encoding;
    String m_dataType;

    KURL m_urlForReading;
    bool m_urlForReadingIsStream;
    RefPtr<ThreadableLoader> m_loader;

    RefPtr<ArrayBuffer> m_rawData;
    bool m_isRawDataConverted;

    String m_stringResult;

    // The decoder used to decode the text data.
    RefPtr<TextResourceDecoder> m_decoder;

    bool m_variableLength;
    bool m_finishedLoading;
    unsigned m_bytesLoaded;
    unsigned m_totalBytes;

    bool m_hasRange;
    unsigned m_rangeStart;
    unsigned m_rangeEnd;

    FileError::ErrorCode m_errorCode;
};

} // namespace WebCore

#endif // FileReaderLoader_h