mirror of
https://github.com/Fledge68/WiiFlow_Lite.git
synced 2024-12-27 20:31:54 +01:00
414 lines
9.9 KiB
C
414 lines
9.9 KiB
C
/**
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* ext2file.c - devoptab file routines for EXT2-based devices.
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*
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* Copyright (c) 2006 Michael "Chishm" Chisholm
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* Copyright (c) 2009 Rhys "Shareese" Koedijk
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* Copyright (c) 2010 Dimok
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by 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/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of 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
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include "ext2_internal.h"
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#include "ext2file.h"
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#define STATE(x) ((ext2_file_state*)x)
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void ext2CloseFile (ext2_file_state *file)
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{
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// Sanity check
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if (!file || !file->vd)
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return;
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ext2fs_file_close(file->fd);
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// Sync the file (and its attributes) to disc
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if(file->write)
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{
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// Read in node changes before writing them
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ext2fs_read_inode(file->vd->fs, file->ni->ino, &file->ni->ni);
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ext2UpdateTimes(file->vd, file->ni, EXT2_UPDATE_ACTIME);
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}
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if (file->read)
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ext2UpdateTimes(file->vd, file->ni, EXT2_UPDATE_ATIME);
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ext2Sync(file->vd, file->ni);
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// Close the file (if open)
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if (file->ni)
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ext2CloseEntry(file->vd, file->ni);
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// Reset the file state
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file->ni = NULL;
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file->fd = NULL;
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file->flags = 0;
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file->read = false;
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file->write = false;
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file->append = false;
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return;
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}
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int ext2_open_r (struct _reent *r, void *fileStruct, const char *path, int flags, int mode)
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{
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ext2_log_trace("fileStruct %p, path %s, flags %i, mode %i\n", fileStruct, path, flags, mode);
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ext2_file_state* file = STATE(fileStruct);
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// Get the volume descriptor for this path
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file->vd = ext2GetVolume(path);
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if (!file->vd) {
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r->_errno = ENODEV;
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return -1;
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}
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// Lock
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ext2Lock(file->vd);
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// Determine which mode the file is opened for
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file->flags = flags;
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if ((flags & 0x03) == O_RDONLY) {
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file->read = true;
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file->write = false;
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file->append = false;
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} else if ((flags & 0x03) == O_WRONLY) {
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file->read = false;
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file->write = true;
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file->append = (flags & O_APPEND);
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} else if ((flags & 0x03) == O_RDWR) {
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file->read = true;
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file->write = true;
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file->append = (flags & O_APPEND);
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} else {
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r->_errno = EACCES;
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ext2Unlock(file->vd);
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return -1;
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}
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// Try and find the file and (if found) ensure that it is not a directory
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file->ni = ext2OpenEntry(file->vd, path);
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if (file->ni && LINUX_S_ISDIR(file->ni->ni.i_mode))
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{
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ext2CloseEntry(file->vd, file->ni);
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ext2Unlock(file->vd);
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r->_errno = EISDIR;
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return -1;
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}
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// Are we creating this file?
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if ((flags & O_CREAT) && !file->ni)
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// Create the file
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file->ni = ext2Create(file->vd, path, S_IFREG, NULL);
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// Sanity check, the file should be open by now
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if (!file->ni) {
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ext2Unlock(file->vd);
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r->_errno = ENOENT;
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return -1;
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}
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// Make sure we aren't trying to write to a read-only file
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if (!(file->vd->fs->flags & EXT2_FLAG_RW) && file->write)
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{
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ext2CloseEntry(file->vd, file->ni);
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ext2Unlock(file->vd);
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r->_errno = EROFS;
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return -1;
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}
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errcode_t err = ext2fs_file_open2(file->vd->fs, file->ni->ino, &file->ni->ni,
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file->write ? EXT2_FLAG_RW : 0, &file->fd);
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if(err != 0)
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{
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ext2CloseEntry(file->vd, file->ni);
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ext2Unlock(file->vd);
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r->_errno = ENOENT;
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return -1;
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}
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// Truncate the file if requested
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if ((flags & O_TRUNC) && file->write) {
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if (ext2fs_file_set_size2(file->fd, 0) != 0) {
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ext2CloseEntry(file->vd, file->ni);
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ext2Unlock(file->vd);
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r->_errno = errno;
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return -1;
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}
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file->ni->ni.i_size = file->ni->ni.i_size_high = 0;
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}
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// Set the files current position
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ext2fs_file_llseek(file->fd, file->append ? EXT2_I_SIZE(&file->ni->ni) : 0, SEEK_SET, 0);
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ext2_log_trace("file->len %lld\n", EXT2_I_SIZE(&file->ni->ni));
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// Update file times
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ext2UpdateTimes(file->vd, file->ni, EXT2_UPDATE_ATIME);
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// Insert the file into the double-linked FILO list of open files
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if (file->vd->firstOpenFile) {
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file->nextOpenFile = file->vd->firstOpenFile;
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file->vd->firstOpenFile->prevOpenFile = file;
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} else {
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file->nextOpenFile = NULL;
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}
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file->prevOpenFile = NULL;
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file->vd->firstOpenFile = file;
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file->vd->openFileCount++;
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// Sync access time
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ext2Sync(file->vd, file->ni);
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// Unlock
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ext2Unlock(file->vd);
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return (int)fileStruct;
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}
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int ext2_close_r (struct _reent *r, int fd)
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{
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ext2_log_trace("fd %p\n", (void *) fd);
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ext2_file_state* file = STATE(fd);
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// Sanity check
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if (!file || !file->vd) {
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r->_errno = EBADF;
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return -1;
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}
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// Lock
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ext2Lock(file->vd);
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// Close the file
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ext2CloseFile(file);
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// Remove the file from the double-linked FILO list of open files
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file->vd->openFileCount--;
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if (file->nextOpenFile)
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file->nextOpenFile->prevOpenFile = file->prevOpenFile;
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if (file->prevOpenFile)
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file->prevOpenFile->nextOpenFile = file->nextOpenFile;
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else
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file->vd->firstOpenFile = file->nextOpenFile;
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// Unlock
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ext2Unlock(file->vd);
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return 0;
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}
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ssize_t ext2_write_r (struct _reent *r, int fd, const char *ptr, size_t len)
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{
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ext2_log_trace("fd %p, ptr %p, len %i\n", (void *) fd, ptr, len);
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ext2_file_state* file = STATE(fd);
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// Sanity check
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if (!file || !file->vd || !file->fd) {
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r->_errno = EINVAL;
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return -1;
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}
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// Short circuit cases where we don't actually have to do anything
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if (!ptr || len <= 0) {
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return 0;
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}
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// Check that we are allowed to write to this file
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if (!file->write) {
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r->_errno = EACCES;
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return -1;
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}
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// Lock
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ext2Lock(file->vd);
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u32 writen = 0;
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// Write to the files data atrribute
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errcode_t err = ext2fs_file_write(file->fd, ptr, len, &writen);
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if (writen <= 0 || err) {
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ext2Unlock(file->vd);
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r->_errno = errno;
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return (err ? err : -1);
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}
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// Unlock
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ext2Unlock(file->vd);
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return (writen == 0 ? -1 : writen);
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}
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ssize_t ext2_read_r (struct _reent *r, int fd, char *ptr, size_t len)
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{
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ext2_log_trace("fd %p, ptr %p, len %i\n", (void *) fd, ptr, len);
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ext2_file_state* file = STATE(fd);
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// Sanity check
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if (!file || !file->vd || !file->fd) {
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r->_errno = EINVAL;
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return -1;
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}
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// Short circuit cases where we don't actually have to do anything
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if (!ptr || len <= 0) {
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return 0;
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}
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// Lock
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ext2Lock(file->vd);
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// Check that we are allowed to read from this file
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if (!file->read) {
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ext2Unlock(file->vd);
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r->_errno = EACCES;
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return -1;
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}
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u32 read = 0;
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errcode_t err = 0;
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// Read from the files data attribute
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err = ext2fs_file_read(file->fd, ptr, len, &read);
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if (err || read <= 0 || read > len) {
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ext2Unlock(file->vd);
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r->_errno = errno;
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return err ? err : -1;
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}
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// Unlock
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ext2Unlock(file->vd);
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return (read == 0) ? -1 : read;
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}
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off_t ext2_seek_r (struct _reent *r, int fd, off_t pos, int dir)
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{
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ext2_log_trace("fd %p, pos %lli, dir %i\n", (void *) fd, pos, dir);
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ext2_file_state* file = STATE(fd);
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// Sanity check
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if (!file || !file->fd) {
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r->_errno = EINVAL;
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return -1;
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}
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u64 pos_loaded = 0;
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ext2fs_file_llseek(file->fd, pos, dir, &pos_loaded);
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return (off_t) pos_loaded;
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}
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int ext2_fstat_r (struct _reent *r, int fd, struct stat *st)
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{
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ext2_log_trace("fd %p\n", (void *) fd);
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ext2_file_state* file = STATE(fd);
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int ret = 0;
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// Sanity check
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if (!file || !file->vd || !file->ni || !file->fd) {
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r->_errno = EINVAL;
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return -1;
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}
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// Short circuit cases were we don't actually have to do anything
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if (!st)
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return 0;
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// Get the file stats
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ret = ext2Stat(file->vd, file->ni, st);
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if (ret)
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r->_errno = errno;
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return ret;
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}
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int ext2_ftruncate_r (struct _reent *r, int fd, off_t len)
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{
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ext2_log_trace("fd %p, len %Li\n", (void *) fd, len);
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ext2_file_state* file = STATE(fd);
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errcode_t err = 0;
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// Sanity check
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if (!file || !file->vd || !file->ni || !file->fd) {
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r->_errno = EINVAL;
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return -1;
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}
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// Lock
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ext2Lock(file->vd);
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// Check that we are allowed to write to this file
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if (!file->write) {
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ext2Unlock(file->vd);
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r->_errno = EACCES;
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return -1;
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}
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err = ext2fs_file_set_size2(file->fd, len);
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// Sync the file (and its attributes) to disc
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if(!err)
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ext2Sync(file->vd, file->ni);
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// update times
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ext2UpdateTimes(file->vd, file->ni, EXT2_UPDATE_AMTIME);
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// Unlock
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ext2Unlock(file->vd);
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return err;
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}
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int ext2_fsync_r (struct _reent *r, int fd)
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{
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ext2_log_trace("fd %p\n", (void *) fd);
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ext2_file_state* file = STATE(fd);
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int ret = 0;
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// Sanity check
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if (!file || !file->fd) {
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r->_errno = EINVAL;
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return -1;
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}
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// Lock
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ext2Lock(file->vd);
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// Sync the file (and its attributes) to disc
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ret = ext2fs_file_flush(file->fd);
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if (ret)
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r->_errno = ret;
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// Unlock
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ext2Unlock(file->vd);
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return ret;
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}
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