165 lines
3.6 KiB
C++
165 lines
3.6 KiB
C++
/*
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h" /* must be first for large file support */
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#include "FileInputPlugin.hxx"
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#include "InputInternal.hxx"
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#include "InputStream.hxx"
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#include "InputPlugin.hxx"
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#include "fd_util.h"
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#include "open.h"
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#include "io_error.h"
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#include <sys/stat.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <glib.h>
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "input_file"
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struct FileInputStream {
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struct input_stream base;
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int fd;
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FileInputStream(const char *path, int _fd, off_t size,
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Mutex &mutex, Cond &cond)
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:base(input_plugin_file, path, mutex, cond),
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fd(_fd) {
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base.size = size;
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base.seekable = true;
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base.ready = true;
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}
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~FileInputStream() {
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close(fd);
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}
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};
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static struct input_stream *
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input_file_open(const char *filename,
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Mutex &mutex, Cond &cond,
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GError **error_r)
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{
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int fd, ret;
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struct stat st;
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if (!g_path_is_absolute(filename))
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return nullptr;
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fd = open_cloexec(filename, O_RDONLY|O_BINARY, 0);
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if (fd < 0) {
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if (errno != ENOENT && errno != ENOTDIR)
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g_set_error(error_r, errno_quark(), errno,
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"Failed to open \"%s\": %s",
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filename, g_strerror(errno));
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return nullptr;
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}
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ret = fstat(fd, &st);
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if (ret < 0) {
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g_set_error(error_r, errno_quark(), errno,
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"Failed to stat \"%s\": %s",
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filename, g_strerror(errno));
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close(fd);
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return nullptr;
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}
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if (!S_ISREG(st.st_mode)) {
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g_set_error(error_r, errno_quark(), 0,
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"Not a regular file: %s", filename);
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close(fd);
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return nullptr;
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}
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#ifdef POSIX_FADV_SEQUENTIAL
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posix_fadvise(fd, (off_t)0, st.st_size, POSIX_FADV_SEQUENTIAL);
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#endif
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FileInputStream *fis = new FileInputStream(filename, fd, st.st_size,
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mutex, cond);
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return &fis->base;
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}
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static bool
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input_file_seek(struct input_stream *is, goffset offset, int whence,
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GError **error_r)
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{
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FileInputStream *fis = (FileInputStream *)is;
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offset = (goffset)lseek(fis->fd, (off_t)offset, whence);
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if (offset < 0) {
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g_set_error(error_r, errno_quark(), errno,
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"Failed to seek: %s", g_strerror(errno));
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return false;
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}
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is->offset = offset;
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return true;
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}
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static size_t
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input_file_read(struct input_stream *is, void *ptr, size_t size,
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GError **error_r)
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{
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FileInputStream *fis = (FileInputStream *)is;
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ssize_t nbytes;
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nbytes = read(fis->fd, ptr, size);
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if (nbytes < 0) {
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g_set_error(error_r, errno_quark(), errno,
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"Failed to read: %s", g_strerror(errno));
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return 0;
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}
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is->offset += nbytes;
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return (size_t)nbytes;
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}
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static void
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input_file_close(struct input_stream *is)
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{
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FileInputStream *fis = (FileInputStream *)is;
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delete fis;
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}
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static bool
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input_file_eof(struct input_stream *is)
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{
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return is->offset >= is->size;
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}
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const struct input_plugin input_plugin_file = {
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"file",
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nullptr,
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nullptr,
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input_file_open,
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input_file_close,
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nullptr,
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nullptr,
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nullptr,
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nullptr,
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input_file_read,
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input_file_eof,
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input_file_seek,
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};
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