88 lines
1.4 KiB
C++
88 lines
1.4 KiB
C++
#include "io.hpp"
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#include "debug.hpp"
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#include "except.hpp"
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#include <cstdio>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <unistd.h>
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using namespace std;
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fd_ref::fd_ref (int _fd):
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m_fd (_fd)
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{
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if (m_fd < 0)
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throw invalid_argument ("invalid file descriptor");
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}
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fd_ref::~fd_ref () {
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check (m_fd >= 0);
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close (m_fd);
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}
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fd_ref::operator int (void) const
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{ return m_fd; }
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mapped_file::mapped_file (const char *_path):
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m_fd (open (_path, O_RDONLY))
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{ load_fd (); }
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mapped_file::mapped_file (const std::string &_path):
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m_fd (open (_path.c_str (), O_RDONLY))
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{ load_fd (); }
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mapped_file::mapped_file (const boost::filesystem::path &_path):
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m_fd (open (_path.native ().c_str (), O_RDONLY))
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{ load_fd (); }
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mapped_file::~mapped_file () {
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check (m_data != NULL);
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munmap (m_data, m_size);
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}
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void
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mapped_file::load_fd (void) {
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struct stat meta;
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if (fstat (m_fd, &meta) < 0)
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throw errno_error ();
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m_size = (size_t)meta.st_size;
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m_data = (uint8_t *)mmap (NULL, m_size, PROT_READ, MAP_PRIVATE, m_fd, 0);
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if (m_data == MAP_FAILED)
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throw errno_error ();
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}
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size_t
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mapped_file::size (void) const {
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check (m_size > 0);
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check (m_data != NULL);
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return m_size;
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}
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const uint8_t*
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mapped_file::data (void) const {
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check (m_size > 0);
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check (m_data != NULL);
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return m_data;
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}
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