87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
/*
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* Copyright (C) 2009, Willow Garage, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the names of Stanford University or Willow Garage, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef RESOURCE_RETRIEVER_RETRIEVER_H
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#define RESOURCE_RETRIEVER_RETRIEVER_H
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#include <stdint.h>
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#include <string>
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#include <boost/shared_array.hpp>
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#include <stdexcept>
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typedef void CURL;
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namespace resource_retriever
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{
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class Exception : public std::runtime_error
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{
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public:
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Exception(const std::string& file, const std::string& error_msg)
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: std::runtime_error("Error retrieving file [" + file + "]: " + error_msg)
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{}
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};
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/**
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* \brief A combination of a pointer to data in memory along with the data's size.
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*/
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struct MemoryResource
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{
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MemoryResource()
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: size(0)
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{}
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boost::shared_array<uint8_t> data;
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uint32_t size;
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};
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/**
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* \brief Retrieves files from from a url. Caches a CURL handle so multiple accesses to a single url
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* will keep connections open.
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*/
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class Retriever
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{
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public:
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Retriever();
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~Retriever();
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/**
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* \brief Get a file and store it in memory
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* \param url The url to retrieve. package://package/file will be turned into the correct file:// invocation
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* \return The file, loaded into memory
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* \throws resource_retriever::Exception if anything goes wrong.
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*/
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MemoryResource get(const std::string& url);
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private:
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CURL* curl_handle_;
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};
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} // namespace resource_retriever
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#endif // RESOURCE_RETRIEVER_RETRIEVER_H
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