I forgot to add new files for VSTa filesystem.
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252
stage2/fsys_vstafs.c
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252
stage2/fsys_vstafs.c
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2001 Free Software Foundation, Inc.
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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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifdef FSYS_VSTAFS
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#include "shared.h"
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#include "filesys.h"
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#include "vstafs.h"
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static void get_file_info (int sector);
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static struct dir_entry *vstafs_readdir (long sector);
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static struct dir_entry *vstafs_nextdir (void);
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#define FIRST_SECTOR ((struct first_sector *) FSYS_BUF)
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#define FILE_INFO ((struct fs_file *) (int) FIRST_SECTOR + 8192)
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#define DIRECTORY_BUF ((struct dir_entry *) (int) FILE_INFO + 512)
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#define ROOT_SECTOR 1
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/*
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* In f_sector we store the sector number in which the information about
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* the found file is.
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*/
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extern int filepos;
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static int f_sector;
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int
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vstafs_mount (void)
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{
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int retval = 1;
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if( (((current_drive & 0x80) || (current_slice != 0))
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&& current_slice != PC_SLICE_TYPE_VSTAFS)
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|| ! devread (0, 0, BLOCK_SIZE, (char *) FSYS_BUF)
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|| FIRST_SECTOR->fs_magic != 0xDEADFACE)
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retval = 0;
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return retval;
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}
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static void
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get_file_info (int sector)
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{
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devread (sector, 0, BLOCK_SIZE, (char *) FILE_INFO);
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}
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static int curr_ext, current_direntry, current_blockpos;
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static struct alloc *a;
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static struct dir_entry *
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vstafs_readdir (long sector)
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{
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/*
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* Get some information from the current directory
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*/
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get_file_info (sector);
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if (FILE_INFO->type != 2)
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{
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errnum = ERR_FILE_NOT_FOUND;
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return 0;
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}
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a = FILE_INFO->blocks;
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curr_ext = 0;
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devread (a[curr_ext].a_start, 0, 512, (char *) DIRECTORY_BUF);
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current_direntry = 11;
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current_blockpos = 0;
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return &DIRECTORY_BUF[10];
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}
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static struct dir_entry *
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vstafs_nextdir (void)
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{
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if (current_direntry > 15)
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{
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current_direntry = 0;
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if (++current_blockpos > (a[curr_ext].a_len - 1))
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{
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current_blockpos = 0;
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curr_ext++;
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}
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if (curr_ext < FILE_INFO->extents)
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{
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devread (a[curr_ext].a_start + current_blockpos, 0,
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512, (char *) DIRECTORY_BUF);
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}
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else
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{
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/* errnum =ERR_FILE_NOT_FOUND; */
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return 0;
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}
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}
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return &DIRECTORY_BUF[current_direntry++];
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}
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int
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vstafs_dir (char *dirname)
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{
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char *fn, ch;
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struct dir_entry *d;
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/* int l, i, s; */
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/*
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* Read in the entries of the current directory.
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*/
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f_sector = ROOT_SECTOR;
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do
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{
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if (! (d = vstafs_readdir (f_sector)))
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{
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return 0;
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}
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/*
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* Find the file in the path
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*/
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while (*dirname == '/') dirname++;
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fn = dirname;
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while ((ch = *fn) && ch != '/' && ! isspace (ch)) fn++;
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*fn = 0;
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do
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{
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if (d->name[0] == 0 || d->name[0] & 0x80)
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continue;
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#ifndef STAGE1_5
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if (print_possibilities && ch != '/'
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&& (! *dirname || strcmp (dirname, d->name) <= 0))
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{
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if (print_possibilities > 0)
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print_possibilities = -print_possibilities;
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printf (" %s", d->name);
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}
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#endif
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if (! grub_strcmp (dirname, d->name))
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{
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f_sector = d->start;
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get_file_info (f_sector);
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filemax = FILE_INFO->len;
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break;
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}
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}
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while ((d =vstafs_nextdir ()));
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*(dirname = fn) = ch;
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if (! d)
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{
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if (print_possibilities < 0)
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{
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putchar ('\n');
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return 1;
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}
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errnum = ERR_FILE_NOT_FOUND;
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return 0;
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}
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}
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while (*dirname && ! isspace (ch));
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return 1;
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}
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int
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vstafs_read (char *addr, int len)
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{
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struct alloc *a;
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int size, ret = 0, offset, curr_len = 0;
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int curr_ext;
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char extent;
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int ext_size;
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char *curr_pos;
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get_file_info (f_sector);
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size = FILE_INFO->len-VSTAFS_START_DATA;
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a = FILE_INFO->blocks;
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if (filepos > 0)
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{
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if (filepos < a[0].a_len * 512 - VSTAFS_START_DATA)
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{
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offset = filepos + VSTAFS_START_DATA;
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extent = 0;
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curr_len = a[0].a_len * 512 - offset - filepos;
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}
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else
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{
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ext_size = a[0].a_len * 512 - VSTAFS_START_DATA;
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offset = filepos - ext_size;
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extent = 1;
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do
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{
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curr_len -= ext_size;
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offset -= ext_size;
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ext_size = a[extent+1].a_len * 512;
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}
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while (extent < FILE_INFO->extents && offset>ext_size);
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}
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}
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else
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{
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offset = VSTAFS_START_DATA;
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extent = 0;
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curr_len = a[0].a_len * 512 - offset;
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}
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curr_pos = addr;
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if (curr_len > len)
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curr_len = len;
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for (curr_ext=extent;
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curr_ext < FILE_INFO->extents;
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curr_len = a[curr_ext].a_len * 512, curr_pos += curr_len, curr_ext++)
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{
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ret += curr_len;
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size -= curr_len;
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if (size < 0)
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{
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ret += size;
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curr_len += size;
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}
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devread (a[curr_ext].a_start,offset, curr_len, curr_pos);
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offset = 0;
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}
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return ret;
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}
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#endif /* FSYS_VSTAFS */
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88
stage2/vstafs.h
Normal file
88
stage2/vstafs.h
Normal file
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@ -0,0 +1,88 @@
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2001 Free Software Foundation, Inc.
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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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef VSTAFS_H
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#define VSTAFS_H 1
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#define LINE 16
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#define BLOCK_SIZE 512
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#define VSTAFS_START_DATA 320
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struct bootrecord
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{
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unsigned char flag;
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unsigned char s_sector;
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unsigned char s_head;
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unsigned char s_cylinder;
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unsigned char p_type;
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unsigned char e_sector;
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unsigned char e_head;
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unsigned char e_cylinder;
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unsigned long start_lba;
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unsigned long nr_sector_lba;
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};
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struct alloc
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{
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unsigned long a_start;
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unsigned long a_len;
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};
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struct first_sector
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{
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unsigned long fs_magic;
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unsigned long fs_size;
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unsigned long fs_extsize;
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unsigned long fs_free;
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struct alloc fs_freesecs[0];
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};
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struct prot
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{
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unsigned char len;
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unsigned char pdefault;
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unsigned char id[7];
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unsigned char bits[7];
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};
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struct fs_file
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{
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unsigned long prev;
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unsigned long rev;
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unsigned long len;
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unsigned short type;
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unsigned short nlink;
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struct prot pprot;
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unsigned int owner;
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unsigned int extents;
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struct alloc blocks[32];
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long fs_ctime, fs_mtime; /* it is not lon but time_t */
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char pad[16];
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char data[0];
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};
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struct dir_entry
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{
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char name[28];
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unsigned long start;
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};
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#endif /* ! VSTAFS_H */
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