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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* dir_iterator.c
*
* Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "sqfs/dir_reader.h"
#include "sqfs/xattr_reader.h"
#include "sqfs/dir_entry.h"
#include "sqfs/error.h"
#include "sqfs/inode.h"
#include "sqfs/id_table.h"
#include "sqfs/data_reader.h"
#include "sqfs/dir.h"
#include "sqfs/io.h"
#include "util/util.h"
#include <stdlib.h>
#include <string.h>
typedef struct {
sqfs_dir_iterator_t base;
sqfs_dir_reader_state_t state;
sqfs_u32 xattr_idx;
sqfs_inode_generic_t *inode;
sqfs_dir_node_t *dent;
sqfs_xattr_reader_t *xattr;
sqfs_data_reader_t *data;
sqfs_dir_reader_t *rd;
sqfs_id_table_t *id;
} iterator_t;
static int it_next(sqfs_dir_iterator_t *base, sqfs_dir_entry_t **out)
{
iterator_t *it = (iterator_t *)base;
sqfs_dir_entry_t *ent = NULL;
int ret;
sqfs_free(it->inode);
sqfs_free(it->dent);
it->inode = NULL;
it->dent = NULL;
ret = sqfs_dir_reader_read(it->rd, &it->state, &it->dent);
if (ret != 0)
return ret;
ret = sqfs_dir_reader_get_inode(it->rd, it->state.ent_ref, &it->inode);
if (ret != 0)
goto fail;
ret = sqfs_dir_entry_from_inode((const char *)it->dent->name,
it->dent->size + 1, it->inode,
it->id, &ent);
if (ret)
goto fail;
ent->inode = it->state.ent_ref;
sqfs_inode_get_xattr_index(it->inode, &it->xattr_idx);
*out = ent;
return 0;
fail:
sqfs_free(it->inode);
sqfs_free(it->dent);
sqfs_free(ent);
it->inode = NULL;
it->dent = NULL;
return ret;
}
static int it_read_link(sqfs_dir_iterator_t *base, char **out)
{
iterator_t *it = (iterator_t *)base;
size_t size;
*out = NULL;
if (it->inode == NULL)
return SQFS_ERROR_NO_ENTRY;
if (it->inode->base.type == SQFS_INODE_SLINK) {
size = it->inode->data.slink.target_size;
} else if (it->inode->base.type == SQFS_INODE_EXT_SLINK) {
size = it->inode->data.slink.target_size;
} else {
return SQFS_ERROR_NO_ENTRY;
}
*out = calloc(1, size + 1);
if (*out == NULL)
return SQFS_ERROR_ALLOC;
memcpy(*out, it->inode->extra, size);
return 0;
}
static int it_open_subdir(sqfs_dir_iterator_t *base, sqfs_dir_iterator_t **out)
{
iterator_t *it = (iterator_t *)base;
*out = NULL;
if (it->inode == NULL)
return SQFS_ERROR_NO_ENTRY;
if (it->inode->base.type != SQFS_INODE_DIR &&
it->inode->base.type != SQFS_INODE_EXT_DIR) {
return SQFS_ERROR_NOT_DIR;
}
return sqfs_dir_iterator_create(it->rd, it->id, it->data, it->xattr,
it->inode, out);
}
static void it_ignore_subdir(sqfs_dir_iterator_t *it)
{
(void)it;
}
static int it_open_file_ro(sqfs_dir_iterator_t *base, sqfs_istream_t **out)
{
iterator_t *it = (iterator_t *)base;
if (it->inode == NULL)
return SQFS_ERROR_NO_ENTRY;
if (it->inode->base.type != SQFS_INODE_FILE &&
it->inode->base.type != SQFS_INODE_EXT_FILE) {
return SQFS_ERROR_NOT_FILE;
}
if (it->data == NULL)
return SQFS_ERROR_UNSUPPORTED;
return sqfs_data_reader_create_stream(it->data, it->inode,
(const char *)it->dent->name,
out);
}
static int it_read_xattr(sqfs_dir_iterator_t *base, sqfs_xattr_t **out)
{
iterator_t *it = (iterator_t *)base;
if (it->inode == NULL)
return SQFS_ERROR_NO_ENTRY;
if (it->xattr == NULL || it->xattr_idx == 0xFFFFFFFF)
return 0;
return sqfs_xattr_reader_read_all(it->xattr, it->xattr_idx, out);
}
static void it_destroy(sqfs_object_t *obj)
{
iterator_t *it = (iterator_t *)obj;
sqfs_free(it->inode);
sqfs_free(it->dent);
sqfs_drop(it->id);
sqfs_drop(it->rd);
sqfs_drop(it->data);
sqfs_drop(it->xattr);
sqfs_free(it);
}
int sqfs_dir_iterator_create(sqfs_dir_reader_t *rd,
sqfs_id_table_t *id,
sqfs_data_reader_t *data,
sqfs_xattr_reader_t *xattr,
const sqfs_inode_generic_t *inode,
sqfs_dir_iterator_t **out)
{
sqfs_dir_iterator_t *base;
iterator_t *it;
int ret;
it = calloc(1, sizeof(*it));
base = (sqfs_dir_iterator_t *)it;
if (it == NULL)
return SQFS_ERROR_ALLOC;
sqfs_object_init(it, it_destroy, NULL);
ret = sqfs_dir_reader_open_dir(rd, inode, &it->state, 0);
if (ret) {
sqfs_free(it);
return ret;
}
base->next = it_next;
base->read_link = it_read_link;
base->open_subdir = it_open_subdir;
base->ignore_subdir = it_ignore_subdir;
base->open_file_ro = it_open_file_ro;
base->read_xattr = it_read_xattr;
it->id = sqfs_grab(id);
it->rd = sqfs_grab(rd);
if (data != NULL)
it->data = sqfs_grab(data);
if (xattr != NULL)
it->xattr = sqfs_grab(xattr);
*out = base;
return 0;
}
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