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include/cinder/UrlImplCurl.h

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00001 /*
00002  Copyright (c) 2010, The Cinder Project (http://libcinder.org)
00003  All rights reserved.
00004 
00005  Redistribution and use in source and binary forms, with or without modification, are permitted provided that
00006  the following conditions are met:
00007 
00008     * Redistributions of source code must retain the above copyright notice, this list of conditions and
00009     the following disclaimer.
00010     * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
00011     the following disclaimer in the documentation and/or other materials provided with the distribution.
00012 
00013  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
00014  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
00015  PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
00016  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00017  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00018  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00019  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00020  POSSIBILITY OF SUCH DAMAGE.
00021 */
00022 
00023 #pragma once
00024 
00025 #include "cinder/Url.h"
00026 
00027 typedef void CURL;
00028 typedef void CURLM;
00029 
00030 namespace cinder {
00031 
00032 class IStreamUrlImplCurl : public IStreamUrlImpl {
00033   public:
00034     IStreamUrlImplCurl( const std::string &url, const std::string &user, const std::string &password );
00035     ~IStreamUrlImplCurl();
00036 
00037     virtual size_t      readDataAvailable( void *dest, size_t maxSize );
00038     virtual void        seekAbsolute( off_t absoluteOffset );
00039     virtual void        seekRelative( off_t relativeOffset );
00040     virtual off_t       tell() const;
00041     virtual off_t       size() const;
00042     
00043     virtual bool        isEof() const;
00044     virtual void        IORead( void *t, size_t size );
00045 
00046   private:
00047     int                 bufferRemaining() const { return mBufferedBytes - mBufferOffset; }
00048     void                fillBuffer( int wantBytes ) const;
00049     
00050     static size_t       writeCallback( char *buffer, size_t size, size_t nitems, void *userp );   
00051   
00052     CURL                    *mCurl;
00053     CURLM                   *mMulti;
00054     
00055     std::string             mUserColonPassword;
00056     
00057     mutable int still_running;              // Is background url fetch still in progress
00058     mutable bool            mStartedRead;
00059 
00060     mutable off_t           mSize;
00061     mutable bool            mSizeCached;
00062     mutable long            mResponseCode;
00063     mutable char            *mEffectiveUrl;
00064     
00065     mutable uint8_t     *mBuffer;
00066     mutable int         mBufferSize;
00067     mutable int         mBufferOffset, mBufferedBytes;
00068     mutable off_t       mBufferFileOffset;  // where in the file the buffer starts
00069     static const int    DEFAULT_BUFFER_SIZE = 4096;
00070 };
00071 
00072 } // namespace cinder