74 lines
2 KiB
C++
74 lines
2 KiB
C++
#pragma once
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#include <string>
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#include "lib_begin.h"
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namespace cgv {
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namespace utils {
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/**
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* class to handle files with very large sizes (>=2GB)
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* hiding the ugly win32 api calls
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*
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* linux-support by using 64bit pointer, LFS required in kernel
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*/
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class CGV_API big_binary_file
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{
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public:
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enum MODE {READ = 1, WRITE = 2, READ_WRITE = 3};
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private:
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MODE access_mode;
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std::string filename;
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bool fileopened;
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void* file;
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public:
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///assosiates the new instance to the file filename
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big_binary_file(const std::string &filename = "");
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///close the file (if it is still opened)
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virtual ~big_binary_file();
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///open a file in read or write mode
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bool open(MODE m, const std::string& file_name = "");
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///close the file
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void close();
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///return true if the file is opened
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bool is_open();
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///return the size of the file in bytes
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long long size();
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///read num bytes from the file into the targetbuffer
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bool read(unsigned char *targetbuffer,unsigned long num, unsigned long *numread=NULL);
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///write num bytes to the file from the sourcebuffer (file must be opened with write access first)
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bool write(const unsigned char *sourcebuffer,unsigned long num, unsigned long *numwrote=NULL);
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/// read a typedef value
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template <typename T>
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bool read(T& v) { return read((unsigned char*)(&v),sizeof(T)); }
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/// read an array of typed values
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template <typename T>
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bool read_array(T* a, unsigned int n) { return read((unsigned char*)a,sizeof(T)*n); }
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/// write a typedef value
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template <typename T>
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bool write(const T& v) { return write((const unsigned char*)(&v),sizeof(T)); }
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/// write an array of typed values
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template <typename T>
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bool write_array(const T* a, unsigned int n) { return write((const unsigned char*)a,sizeof(T)*n); }
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//set the file pointer to index (position in bytes from the beginning of the file)
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bool seek(long long index);
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///return the position of the file pointer in bytes
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long long position();
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};
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}
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}
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#include <cgv/config/lib_end.h> |