/* the Music Player Daemon (MPD) * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com) * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "input_file.h" #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <errno.h> #include <string.h> #include <glib.h> #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "input_file" static bool input_file_open(struct input_stream *is, const char *filename) { int fd, ret; struct stat st; if (filename[0] != '/') return false; fd = open(filename, O_RDONLY); if (fd < 0) { is->error = errno; return false; } is->seekable = true; ret = fstat(fd, &st); if (ret < 0) { is->error = errno; close(fd); return false; } if (!S_ISREG(st.st_mode)) { g_debug("Not a regular file: %s\n", filename); is->error = EINVAL; close(fd); return false; } is->size = st.st_size; #ifdef POSIX_FADV_SEQUENTIAL posix_fadvise(fd, (off_t)0, is->size, POSIX_FADV_SEQUENTIAL); #endif is->plugin = &input_plugin_file; is->data = GINT_TO_POINTER(fd); is->ready = true; return true; } static bool input_file_seek(struct input_stream *is, off_t offset, int whence) { int fd = GPOINTER_TO_INT(is->data); offset = lseek(fd, offset, whence); if (offset < 0) { is->error = errno; return false; } is->offset = offset; return true; } static size_t input_file_read(struct input_stream *is, void *ptr, size_t size) { int fd = GPOINTER_TO_INT(is->data); ssize_t nbytes; nbytes = read(fd, ptr, size); if (nbytes < 0) { is->error = errno; g_debug("input_file_read: error reading: %s\n", strerror(is->error)); return 0; } is->offset += nbytes; return (size_t)nbytes; } static void input_file_close(struct input_stream *is) { int fd = GPOINTER_TO_INT(is->data); close(fd); } static bool input_file_eof(struct input_stream *is) { return is->offset >= is->size; } const struct input_plugin input_plugin_file = { .open = input_file_open, .close = input_file_close, .read = input_file_read, .eof = input_file_eof, .seek = input_file_seek, };