29 lines
679 B
C++
29 lines
679 B
C++
#include "InputMemmoryFile.H"
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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InputMemoryFile::InputMemoryFile(const char *pathname):
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data_(0),
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size_(0),
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file_handle_(-1)
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{
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file_handle_ = ::open(pathname, O_RDONLY);
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if (file_handle_ == -1) return;
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struct stat sbuf;
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if (::fstat(file_handle_, &sbuf) == -1) return;
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data_ = static_cast<const char*>(::mmap(
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0, sbuf.st_size,
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PROT_READ, MAP_SHARED,
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file_handle_, 0));
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if (data_ == MAP_FAILED) data_ = 0;
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else size_ = sbuf.st_size;
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}
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InputMemoryFile::~InputMemoryFile() {
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::munmap(const_cast<char*>(data_), size_);
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::close(file_handle_);
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}
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