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;
bytesLoaded()76     unsigned bytesLoaded() const { return m_bytesLoaded; }
totalBytes()77     unsigned totalBytes() const { return m_totalBytes; }
errorCode()78     int errorCode() const { return m_errorCode; }
79 
80     void setEncoding(const String&);
setDataType(const String & dataType)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