154 lines
3.3 KiB
C++
154 lines
3.3 KiB
C++
/*
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* Copyright (C) 2003-2014 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 "../InputStream.hxx"
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#include "../InputPlugin.hxx"
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#include "util/Error.hxx"
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#include "util/Domain.hxx"
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#include "fs/Traits.hxx"
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#include "system/fd_util.h"
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#include "open.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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static constexpr Domain file_domain("file");
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struct FileInputStream final : public InputStream {
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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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:InputStream(input_plugin_file, path, _mutex, _cond),
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fd(_fd) {
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size = _size;
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seekable = true;
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SetReady();
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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 InputStream *
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input_file_open(const char *filename,
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Mutex &mutex, Cond &cond,
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Error &error)
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{
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int fd, ret;
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struct stat st;
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if (!PathTraitsFS::IsAbsolute(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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error.FormatErrno("Failed to open \"%s\"",
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filename);
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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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error.FormatErrno("Failed to stat \"%s\"", filename);
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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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error.Format(file_domain, "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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return new FileInputStream(filename, fd, st.st_size, mutex, cond);
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}
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static bool
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input_file_seek(InputStream *is, InputPlugin::offset_type offset,
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int whence,
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Error &error)
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{
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FileInputStream *fis = (FileInputStream *)is;
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offset = (InputPlugin::offset_type)lseek(fis->fd, (off_t)offset, whence);
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if (offset < 0) {
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error.SetErrno("Failed to seek");
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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(InputStream *is, void *ptr, size_t size,
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Error &error)
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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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error.SetErrno("Failed to read");
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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(InputStream *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(InputStream *is)
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{
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return is->GetOffset() >= is->GetSize();
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}
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const InputPlugin 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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