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/*
Copyright (C) 2013-2018 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file src/lib/file_group.cc
* @brief FileGroup class.
*/
#include "file_group.h"
#include "exceptions.h"
#include "cross.h"
#include "compose.hpp"
#include <sndfile.h>
#include <cstdio>
#include <iostream>
using std::vector;
using std::cout;
/** Construct a FileGroup with no files */
FileGroup::FileGroup ()
: _current_path (0)
, _current_file (0)
{
}
/** Construct a FileGroup with a single file */
FileGroup::FileGroup (boost::filesystem::path p)
: _current_path (0)
, _current_file (0)
{
_paths.push_back (p);
ensure_open_path (0);
seek (0, SEEK_SET);
}
/** Construct a FileGroup with multiple files */
FileGroup::FileGroup (vector<boost::filesystem::path> const & p)
: _paths (p)
, _current_path (0)
, _current_file (0)
{
ensure_open_path (0);
seek (0, SEEK_SET);
}
/** Destroy a FileGroup, closing any open file */
FileGroup::~FileGroup ()
{
if (_current_file) {
fclose (_current_file);
}
}
void
FileGroup::set_paths (vector<boost::filesystem::path> const & p)
{
_paths = p;
ensure_open_path (0);
seek (0, SEEK_SET);
}
/** Ensure that the given path index in the content is the _current_file */
void
FileGroup::ensure_open_path (size_t p) const
{
if (_current_file && _current_path == p) {
/* Already open */
return;
}
if (_current_file) {
fclose (_current_file);
}
_current_path = p;
_current_file = fopen_boost (_paths[_current_path], "rb");
if (_current_file == 0) {
throw OpenFileError (_paths[_current_path], errno, true);
}
}
int64_t
FileGroup::seek (int64_t pos, int whence) const
{
/* Convert pos to `full_pos', which is an offset from the start
of all the files.
*/
int64_t full_pos = 0;
switch (whence) {
case SEEK_SET:
full_pos = pos;
break;
case SEEK_CUR:
for (size_t i = 0; i < _current_path; ++i) {
full_pos += boost::filesystem::file_size (_paths[i]);
}
#ifdef DCPOMATIC_WINDOWS
full_pos += _ftelli64 (_current_file);
#else
full_pos += ftell (_current_file);
#endif
full_pos += pos;
break;
case SEEK_END:
full_pos = length() - pos;
break;
}
/* Seek to full_pos */
size_t i = 0;
int64_t sub_pos = full_pos;
while (i < _paths.size ()) {
boost::uintmax_t len = boost::filesystem::file_size (_paths[i]);
if (sub_pos < int64_t (len)) {
break;
}
sub_pos -= len;
++i;
}
if (i == _paths.size ()) {
return -1;
}
ensure_open_path (i);
dcpomatic_fseek (_current_file, sub_pos, SEEK_SET);
return full_pos;
}
/** Try to read some data from the current position into a buffer.
* @param buffer Buffer to write data into.
* @param amount Number of bytes to read.
* @return Number of bytes read.
*/
int
FileGroup::read (uint8_t* buffer, int amount) const
{
int read = 0;
while (true) {
int const this_time = fread (buffer + read, 1, amount - read, _current_file);
read += this_time;
if (read == amount) {
/* Done */
break;
}
if (ferror(_current_file)) {
throw FileError (String::compose("fread error %1", errno), _paths[_current_path]);
}
if (feof (_current_file)) {
/* See if there is another file to use */
if ((_current_path + 1) >= _paths.size()) {
break;
}
ensure_open_path (_current_path + 1);
}
}
return read;
}
/** @return Combined length of all the files */
int64_t
FileGroup::length () const
{
int64_t len = 0;
for (size_t i = 0; i < _paths.size(); ++i) {
len += boost::filesystem::file_size (_paths[i]);
}
return len;
}
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