static fsw_status_t fsw_ext2_dir_lookup(struct fsw_ext2_volume *vol, struct fsw_ext2_dnode *dno,
struct fsw_string *lookup_name, struct fsw_ext2_dnode **child_dno_out)
{
fsw_status_t status;
struct fsw_shandle shand;
fsw_u32 child_ino;
struct ext2_dir_entry entry;
struct fsw_string entry_name;
// Preconditions: The caller has checked that dno is a directory node.
entry_name.type = FSW_STRING_TYPE_ISO88591;
// setup handle to read the directory
status = fsw_shandle_open(dno, &shand);
if (status)
return status;
// scan the directory for the file
child_ino = 0;
while (child_ino == 0) {
// read next entry
status = fsw_ext2_read_dentry(&shand, &entry);
if (status)
goto errorexit;
if (entry.inode == 0) {
// end of directory reached
status = FSW_NOT_FOUND;
goto errorexit;
}
// compare name
entry_name.len = entry_name.size = entry.name_len;
entry_name.data = entry.name;
if (fsw_streq(lookup_name, &entry_name)) {
child_ino = entry.inode;
break;
}
}
// setup a dnode for the child item
status = fsw_dnode_create(dno, child_ino, FSW_DNODE_TYPE_UNKNOWN, &entry_name, child_dno_out);
errorexit:
fsw_shandle_close(&shand);
return status;
}
static fsw_status_t fsw_iso9660_dir_lookup(struct fsw_iso9660_volume *vol, struct fsw_iso9660_dnode *dno,
struct fsw_string *lookup_name, struct fsw_iso9660_dnode **child_dno_out)
{
fsw_status_t status;
struct fsw_shandle shand;
struct iso9660_dirrec_buffer dirrec_buffer;
struct iso9660_dirrec *dirrec = &dirrec_buffer.dirrec;
// Preconditions: The caller has checked that dno is a directory node.
// setup handle to read the directory
status = fsw_shandle_open(dno, &shand);
if (status)
return status;
// scan the directory for the file
while (1) {
// read next entry
status = fsw_iso9660_read_dirrec(vol, &shand, &dirrec_buffer);
if (status)
goto errorexit;
if (dirrec->dirrec_length == 0) {
// end of directory reached
status = FSW_NOT_FOUND;
goto errorexit;
}
// skip . and ..
if (dirrec->file_identifier_length == 1 &&
(dirrec->file_identifier[0] == 0 || dirrec->file_identifier[0] == 1))
continue;
// compare name
if (fsw_streq(lookup_name, &dirrec_buffer.name)) // TODO: compare case-insensitively
break;
}
// setup a dnode for the child item
status = fsw_dnode_create(dno, dirrec_buffer.ino, FSW_DNODE_TYPE_UNKNOWN, &dirrec_buffer.name, child_dno_out);
if (status == FSW_SUCCESS)
fsw_memcpy(&(*child_dno_out)->dirrec, dirrec, sizeof(struct iso9660_dirrec));
errorexit:
fsw_shandle_close(&shand);
return status;
}
static fsw_status_t fsw_iso9660_dir_read(struct fsw_iso9660_volume *vol, struct fsw_iso9660_dnode *dno,
struct fsw_shandle *shand, struct fsw_iso9660_dnode **child_dno_out)
{
fsw_status_t status;
struct iso9660_dirrec_buffer dirrec_buffer;
struct iso9660_dirrec *dirrec = &dirrec_buffer.dirrec;
// Preconditions: The caller has checked that dno is a directory node. The caller
// has opened a storage handle to the directory's storage and keeps it around between
// calls.
/* (vasily) directory nodes are 4096 bytes that is two logical blocks so read dir operation
* should read both blocks.
*/
while (1) {
// read next entry
if (shand->pos >= dno->g.size)
return FSW_NOT_FOUND; // end of directory
status = fsw_iso9660_read_dirrec(vol, shand, &dirrec_buffer);
if (status)
return status;
if (dirrec->dirrec_length == 0)
{
// try the next block
shand->pos =(shand->pos & ~(vol->g.log_blocksize - 1)) + vol->g.log_blocksize;
continue;
}
// skip . and ..
if (dirrec->file_identifier_length == 1 &&
(dirrec->file_identifier[0] == 0 || dirrec->file_identifier[0] == 1))
continue;
break;
}
// setup a dnode for the child item
status = fsw_dnode_create(dno, dirrec_buffer.ino, FSW_DNODE_TYPE_UNKNOWN, &dirrec_buffer.name, child_dno_out);
if (status == FSW_SUCCESS)
fsw_memcpy(&(*child_dno_out)->dirrec, dirrec, sizeof(struct iso9660_dirrec));
return status;
}
static fsw_status_t fsw_ext2_dir_read(struct fsw_ext2_volume *vol, struct fsw_ext2_dnode *dno,
struct fsw_shandle *shand, struct fsw_ext2_dnode **child_dno_out)
{
fsw_status_t status;
struct ext2_dir_entry entry;
struct fsw_string entry_name;
// Preconditions: The caller has checked that dno is a directory node. The caller
// has opened a storage handle to the directory's storage and keeps it around between
// calls.
while (1) {
// read next entry
status = fsw_ext2_read_dentry(shand, &entry);
if (status)
return status;
if (entry.inode == 0) // end of directory
return FSW_NOT_FOUND;
// skip . and ..
if ((entry.name_len == 1 && entry.name[0] == '.') ||
(entry.name_len == 2 && entry.name[0] == '.' && entry.name[1] == '.'))
continue;
break;
}
// setup name
entry_name.type = FSW_STRING_TYPE_ISO88591;
entry_name.len = entry_name.size = entry.name_len;
entry_name.data = entry.name;
// setup a dnode for the child item
status = fsw_dnode_create(dno, entry.inode, FSW_DNODE_TYPE_UNKNOWN, &entry_name, child_dno_out);
return status;
}
