2 Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <libavformat/avio.h>
25 #include "file_group.h"
26 #include "exceptions.h"
31 FileGroup::FileGroup (boost::filesystem::path p)
39 FileGroup::FileGroup (vector<boost::filesystem::path> const & p)
48 FileGroup::~FileGroup ()
51 fclose (_current_file);
56 /** Ensure that the given path index in the content is the _current_file */
58 FileGroup::ensure_open_path (size_t p) const
60 if (_current_file && _current_path == p) {
66 fclose (_current_file);
70 _current_file = fopen (_paths[_current_path].string().c_str(), "rb");
71 if (_current_file == 0) {
72 throw OpenFileError (_paths[_current_path]);
77 FileGroup::seek (int64_t pos, int whence) const
79 int64_t const len = length ();
81 /* Convert pos to `full_pos', which is an offset from the start
90 for (size_t i = 0; i < _current_path; ++i) {
91 full_pos += boost::filesystem::file_size (_paths[i]);
93 full_pos += ftell (_current_file);
103 /* Seek to full_pos */
105 int64_t sub_pos = full_pos;
106 while (i < _paths.size ()) {
107 boost::uintmax_t len = boost::filesystem::file_size (_paths[i]);
108 if (sub_pos < int64_t (len)) {
115 if (i == _paths.size ()) {
119 ensure_open_path (i);
120 fseek (_current_file, sub_pos, SEEK_SET);
124 /** Try to read some data from the current position into a buffer.
125 * @param buffer Buffer to write data into.
126 * @param amount Number of bytes to read.
127 * @return Number of bytes read, or -1 in the case of error.
130 FileGroup::read (uint8_t* buffer, int amount) const
134 int const this_time = fread (buffer + read, 1, amount - read, _current_file);
136 if (read == amount) {
141 /* See if there is another file to use */
142 if ((_current_path + 1) >= _paths.size()) {
145 ensure_open_path (_current_path + 1);
152 FileGroup::length () const
155 for (size_t i = 0; i < _paths.size(); ++i) {
156 len += boost::filesystem::file_size (_paths[i]);