125 lines
2.7 KiB
C++
125 lines
2.7 KiB
C++
#include "io.hpp"
|
|
|
|
#include "debug.hpp"
|
|
#include "except.hpp"
|
|
|
|
#include <cstdio>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/mman.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
|
|
using namespace std;
|
|
|
|
//----------------------------------------------------------------------------
|
|
uint8_t *
|
|
slurp (const boost::filesystem::path& path) {
|
|
fd_ref fd(open (path.string ().c_str (), O_RDONLY)); // | O_CLOEXEC));
|
|
|
|
// Calculate the total file size
|
|
off_t size = lseek (fd, 0, SEEK_END);
|
|
if (size == (off_t)-1)
|
|
throw errno_error();
|
|
|
|
if (lseek (fd, 0, SEEK_SET) == (off_t)-1)
|
|
throw errno_error ();
|
|
|
|
// Allocate a buffer, and keep reading until it's full. We provide a null
|
|
// padding at the tail as a 'just in case' measure for string manipulation.
|
|
unique_ptr <uint8_t[]> buffer (new uint8_t[size + 1]);
|
|
buffer.get()[size] = '\0';
|
|
|
|
check_hard (size >= 0);
|
|
size_t remaining = (size_t)size;
|
|
uint8_t *cursor = buffer.get();
|
|
|
|
while (remaining) {
|
|
ssize_t consumed = read (fd, cursor, remaining);
|
|
if (consumed == -1)
|
|
throw errno_error();
|
|
check_hard ( consumed >= 0);
|
|
check_hard ((size_t)consumed <= remaining);
|
|
|
|
remaining -= (size_t)consumed;
|
|
cursor += consumed;
|
|
}
|
|
|
|
return buffer.release();
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
fd_ref::fd_ref (int _fd):
|
|
fd (_fd)
|
|
{
|
|
if (fd < 0)
|
|
throw invalid_argument ("invalid file descriptor");
|
|
}
|
|
|
|
|
|
fd_ref::~fd_ref () {
|
|
check (fd >= 0);
|
|
close (fd);
|
|
}
|
|
|
|
|
|
fd_ref::operator int (void) const
|
|
{ return fd; }
|
|
|
|
|
|
//----------------------------------------------------------------------------
|
|
mapped_file::mapped_file (const char *_path):
|
|
m_fd (open (_path, O_RDONLY))
|
|
{ load_fd (); }
|
|
|
|
|
|
mapped_file::mapped_file (const std::string &_path):
|
|
m_fd (open (_path.c_str (), O_RDONLY))
|
|
{ load_fd (); }
|
|
|
|
|
|
mapped_file::mapped_file (const boost::filesystem::path &_path):
|
|
m_fd (open (_path.native ().c_str (), O_RDONLY))
|
|
{ load_fd (); }
|
|
|
|
|
|
mapped_file::~mapped_file () {
|
|
check (m_data != NULL);
|
|
munmap (m_data, m_size);
|
|
}
|
|
|
|
|
|
void
|
|
mapped_file::load_fd (void) {
|
|
struct stat meta;
|
|
if (fstat (m_fd, &meta) < 0)
|
|
throw errno_error ();
|
|
|
|
m_size = (size_t)meta.st_size;
|
|
m_data = (uint8_t *)mmap (NULL, m_size, PROT_READ, MAP_PRIVATE, m_fd, 0);
|
|
if (m_data == MAP_FAILED)
|
|
throw errno_error ();
|
|
}
|
|
|
|
|
|
size_t
|
|
mapped_file::size (void) const {
|
|
check (m_size > 0);
|
|
check (m_data != NULL);
|
|
|
|
return m_size;
|
|
}
|
|
|
|
|
|
const uint8_t*
|
|
mapped_file::data (void) const {
|
|
check (m_size > 0);
|
|
check (m_data != NULL);
|
|
|
|
return m_data;
|
|
}
|
|
|
|
|
|
|