/* * Copyright (C) 2003-2010 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 "input/file_input_plugin.h" #include "input_plugin.h" #include "fd_util.h" #include "open.h" #include <sys/stat.h> #include <unistd.h> #include <errno.h> #include <string.h> #include <glib.h> #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "input_file" struct file_input_stream { struct input_stream base; int fd; }; static inline GQuark file_quark(void) { return g_quark_from_static_string("file"); } static struct input_stream * input_file_open(const char *filename, GError **error_r) { int fd, ret; struct stat st; struct file_input_stream *fis; if (!g_path_is_absolute(filename)) return false; fd = open_cloexec(filename, O_RDONLY|O_BINARY, 0); if (fd < 0) { if (errno != ENOENT && errno != ENOTDIR) g_set_error(error_r, file_quark(), errno, "Failed to open \"%s\": %s", filename, g_strerror(errno)); return false; } ret = fstat(fd, &st); if (ret < 0) { g_set_error(error_r, file_quark(), errno, "Failed to stat \"%s\": %s", filename, g_strerror(errno)); close(fd); return false; } if (!S_ISREG(st.st_mode)) { g_set_error(error_r, file_quark(), 0, "Not a regular file: %s", filename); close(fd); return false; } #ifdef POSIX_FADV_SEQUENTIAL posix_fadvise(fd, (off_t)0, st.st_size, POSIX_FADV_SEQUENTIAL); #endif fis = g_new(struct file_input_stream, 1); input_stream_init(&fis->base, &input_plugin_file, filename); fis->base.size = st.st_size; fis->base.seekable = true; fis->base.ready = true; fis->fd = fd; return &fis->base; } static bool input_file_seek(struct input_stream *is, goffset offset, int whence, GError **error_r) { struct file_input_stream *fis = (struct file_input_stream *)is; offset = (goffset)lseek(fis->fd, (off_t)offset, whence); if (offset < 0) { g_set_error(error_r, file_quark(), errno, "Failed to seek: %s", g_strerror(errno)); return false; } is->offset = offset; return true; } static size_t input_file_read(struct input_stream *is, void *ptr, size_t size, GError **error_r) { struct file_input_stream *fis = (struct file_input_stream *)is; ssize_t nbytes; nbytes = read(fis->fd, ptr, size); if (nbytes < 0) { g_set_error(error_r, file_quark(), errno, "Failed to read: %s", g_strerror(errno)); return 0; } is->offset += nbytes; return (size_t)nbytes; } static void input_file_close(struct input_stream *is) { struct file_input_stream *fis = (struct file_input_stream *)is; close(fis->fd); input_stream_deinit(&fis->base); g_free(fis); } static bool input_file_eof(struct input_stream *is) { return is->offset >= is->size; } const struct input_plugin input_plugin_file = { .name = "file", .open = input_file_open, .close = input_file_close, .read = input_file_read, .eof = input_file_eof, .seek = input_file_seek, };