146 lines
3.5 KiB
C
146 lines
3.5 KiB
C
/*
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* Copyright (c) 2007 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdlib.h>
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#include <err.h>
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#include <debug.h>
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#include <lib/fs/ext2.h>
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#include "ext2_priv.h"
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#define LOCAL_TRACE 0
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int ext2_open_file(fscookie cookie, const char *path, fsfilecookie *fcookie)
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{
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ext2_t *ext2 = (ext2_t *)cookie;
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int err;
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/* do a path lookup */
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inodenum_t inum;
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err = ext2_lookup(ext2, path, &inum);
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if (err < 0)
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return err;
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/* create the file object */
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ext2_file_t *file = malloc(sizeof(ext2_file_t));
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memset(file, 0, sizeof(ext2_file_t));
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/* read in the inode */
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err = ext2_load_inode(ext2, inum, &file->inode);
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if (err < 0) {
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free(file);
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return err;
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}
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file->ext2 = ext2;
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*fcookie = file;
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return 0;
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}
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int ext2_read_file(fsfilecookie fcookie, void *buf, off_t offset, size_t len)
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{
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ext2_file_t *file = (ext2_file_t *)fcookie;
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int err;
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// test that it's a file
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if (!S_ISREG(file->inode.i_mode)) {
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dprintf(INFO, "ext2_read_file: not a file\n");
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return -1;
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}
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// read from the inode
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err = ext2_read_inode(file->ext2, &file->inode, buf, offset, len);
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return err;
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}
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int ext2_close_file(fsfilecookie fcookie)
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{
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ext2_file_t *file = (ext2_file_t *)fcookie;
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// see if we need to free any of the cache blocks
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int i;
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for (i=0; i < 3; i++) {
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if (file->ind_cache[i].num != 0) {
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free(file->ind_cache[i].ptr);
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}
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}
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free(file);
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return 0;
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}
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off_t ext2_file_len(ext2_t *ext2, struct ext2_inode *inode)
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{
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/* calculate the file size */
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off_t len = inode->i_size;
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if ((ext2->sb.s_feature_ro_compat & EXT2_FEATURE_RO_COMPAT_LARGE_FILE) && (S_ISREG(inode->i_mode))) {
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/* can potentially be a large file */
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len |= (off_t)inode->i_size_high << 32;
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}
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return len;
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}
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int ext2_stat_file(fsfilecookie fcookie, struct file_stat *stat)
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{
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ext2_file_t *file = (ext2_file_t *)fcookie;
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stat->size = ext2_file_len(file->ext2, &file->inode);
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/* is it a dir? */
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stat->is_dir = false;
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if (S_ISDIR(file->inode.i_mode))
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stat->is_dir = true;
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return 0;
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}
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int ext2_read_link(ext2_t *ext2, struct ext2_inode *inode, char *str, size_t len)
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{
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LTRACEF("inode %p, str %p, len %d\n", inode, str, len);
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off_t linklen = ext2_file_len(ext2, inode);
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if ((linklen < 0) || (linklen + 1 > len))
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return ERR_NO_MEMORY;
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if (linklen > 60) {
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int err = ext2_read_inode(ext2, inode, str, 0, linklen);
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if (err < 0)
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return err;
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str[linklen] = 0;
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} else {
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memcpy(str, &inode->i_block[0], linklen);
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str[linklen] = 0;
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}
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LTRACEF("read link '%s'\n", str);
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return linklen;
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}
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