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/** |
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* This file is part of the CernVM File System. |
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*/ |
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#ifndef CVMFS_UTIL_MMAP_FILE_H_ |
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#define CVMFS_UTIL_MMAP_FILE_H_ |
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#include <cstddef> |
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#include <string> |
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#include "util/export.h" |
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#include "util/single_copy.h" |
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#ifdef CVMFS_NAMESPACE_GUARD |
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namespace CVMFS_NAMESPACE_GUARD { |
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#endif |
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/** |
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* Wraps the functionality of mmap() to create a read-only memory mapped file. |
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* |
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* Note: You need to call Map() to actually map the provided file path to memory |
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*/ |
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class CVMFS_EXPORT MemoryMappedFile : SingleCopy { |
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public: |
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explicit MemoryMappedFile(const std::string &file_path); |
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~MemoryMappedFile(); |
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bool Map(); |
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void Unmap(); |
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inline unsigned char* buffer() const { return mapped_file_; } |
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inline size_t size() const { return mapped_size_; } |
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inline const std::string& file_path() const { return file_path_; } |
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inline bool IsMapped() const { return mapped_; } |
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private: |
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const std::string file_path_; |
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int file_descriptor_; |
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unsigned char *mapped_file_; |
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size_t mapped_size_; |
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bool mapped_; |
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}; |
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#ifdef CVMFS_NAMESPACE_GUARD |
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} // namespace CVMFS_NAMESPACE_GUARD |
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#endif |
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#endif // CVMFS_UTIL_MMAP_FILE_H_ |
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