diff options
Diffstat (limited to 'src/input/plugins/FileInputPlugin.cxx')
-rw-r--r-- | src/input/plugins/FileInputPlugin.cxx | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/src/input/plugins/FileInputPlugin.cxx b/src/input/plugins/FileInputPlugin.cxx new file mode 100644 index 000000000..1035973b6 --- /dev/null +++ b/src/input/plugins/FileInputPlugin.cxx @@ -0,0 +1,134 @@ +/* + * Copyright (C) 2003-2014 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program 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. + * + * This program 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 this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" /* must be first for large file support */ +#include "FileInputPlugin.hxx" +#include "../InputStream.hxx" +#include "../InputPlugin.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" +#include "fs/Traits.hxx" +#include "system/fd_util.h" +#include "open.h" + +#include <sys/stat.h> +#include <unistd.h> +#include <errno.h> + +static constexpr Domain file_domain("file"); + +struct FileInputStream final : public InputStream { + int fd; + + FileInputStream(const char *path, int _fd, off_t _size, + Mutex &_mutex, Cond &_cond) + :InputStream(path, _mutex, _cond), + fd(_fd) { + size = _size; + seekable = true; + SetReady(); + } + + ~FileInputStream() { + close(fd); + } + + /* virtual methods from InputStream */ + + bool IsEOF() override { + return GetOffset() >= GetSize(); + } + + size_t Read(void *ptr, size_t size, Error &error) override; + bool Seek(offset_type offset, int whence, Error &error) override; +}; + +static InputStream * +input_file_open(const char *filename, + Mutex &mutex, Cond &cond, + Error &error) +{ + int fd, ret; + struct stat st; + + if (!PathTraitsFS::IsAbsolute(filename)) + return nullptr; + + fd = open_cloexec(filename, O_RDONLY|O_BINARY, 0); + if (fd < 0) { + if (errno != ENOENT && errno != ENOTDIR) + error.FormatErrno("Failed to open \"%s\"", + filename); + return nullptr; + } + + ret = fstat(fd, &st); + if (ret < 0) { + error.FormatErrno("Failed to stat \"%s\"", filename); + close(fd); + return nullptr; + } + + if (!S_ISREG(st.st_mode)) { + error.Format(file_domain, "Not a regular file: %s", filename); + close(fd); + return nullptr; + } + +#ifdef POSIX_FADV_SEQUENTIAL + posix_fadvise(fd, (off_t)0, st.st_size, POSIX_FADV_SEQUENTIAL); +#endif + + return new FileInputStream(filename, fd, st.st_size, mutex, cond); +} + +bool +FileInputStream::Seek(InputPlugin::offset_type new_offset, int whence, + Error &error) +{ + new_offset = (InputPlugin::offset_type)lseek(fd, (off_t)new_offset, + whence); + if (new_offset < 0) { + error.SetErrno("Failed to seek"); + return false; + } + + offset = new_offset; + return true; +} + +size_t +FileInputStream::Read(void *ptr, size_t read_size, Error &error) +{ + ssize_t nbytes = read(fd, ptr, read_size); + if (nbytes < 0) { + error.SetErrno("Failed to read"); + return 0; + } + + offset += nbytes; + return (size_t)nbytes; +} + +const InputPlugin input_plugin_file = { + "file", + nullptr, + nullptr, + input_file_open, +}; |