128 lines
2.7 KiB
C++
128 lines
2.7 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 <fcntl.h>
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#include <unistd.h>
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using namespace std;
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using namespace util;
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//----------------------------------------------------------------------------
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uint8_t *
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util::slurp (const boost::filesystem::path& path) {
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fd_ref fd(open (path.string ().c_str (), O_RDONLY)); // | O_CLOEXEC));
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// Calculate the total file size
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off_t size = lseek (fd, 0, SEEK_END);
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if (size == (off_t)-1)
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throw errno_error();
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if (lseek (fd, 0, SEEK_SET) == (off_t)-1)
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throw errno_error ();
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// Allocate a buffer, and keep reading until it's full. We provide a null
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// padding at the tail as a 'just in case' measure for string manipulation.
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unique_ptr <uint8_t[]> buffer (new uint8_t[size + 1]);
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buffer.get()[size] = '\0';
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check_hard (size >= 0);
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size_t remaining = (size_t)size;
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uint8_t *cursor = buffer.get();
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while (remaining) {
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ssize_t consumed = read (fd, cursor, remaining);
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if (consumed == -1)
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throw errno_error();
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check_hard ( consumed >= 0);
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check_hard ((size_t)consumed <= remaining);
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remaining -= (size_t)consumed;
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cursor += consumed;
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}
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return buffer.release();
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}
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//----------------------------------------------------------------------------
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fd_ref::fd_ref (int _fd):
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fd (_fd)
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{
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if (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 (fd >= 0);
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close (fd);
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}
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fd_ref::operator int (void) const
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{ return fd; }
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#if defined(HAVE_MMAP)
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#include <sys/mman.h>
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//----------------------------------------------------------------------------
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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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#endif
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