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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* readdir.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include "sqfs/meta_reader.h"
#include "sqfs/error.h"
#include "sqfs/super.h"
#include "sqfs/inode.h"
#include "sqfs/dir.h"
#include "compat.h"
#include <stdlib.h>
#include <string.h>
int sqfs_meta_reader_read_dir_header(sqfs_meta_reader_t *m,
sqfs_dir_header_t *hdr)
{
int err = sqfs_meta_reader_read(m, hdr, sizeof(*hdr));
if (err)
return err;
hdr->count = le32toh(hdr->count);
hdr->start_block = le32toh(hdr->start_block);
hdr->inode_number = le32toh(hdr->inode_number);
if (hdr->count > (SQFS_MAX_DIR_ENT - 1))
return SQFS_ERROR_CORRUPTED;
return 0;
}
int sqfs_meta_reader_read_dir_ent(sqfs_meta_reader_t *m,
sqfs_dir_entry_t **result)
{
sqfs_dir_entry_t ent, *out;
sqfs_u16 *diff_u16;
int err;
err = sqfs_meta_reader_read(m, &ent, sizeof(ent));
if (err)
return err;
diff_u16 = (sqfs_u16 *)&ent.inode_diff;
*diff_u16 = le16toh(*diff_u16);
ent.offset = le16toh(ent.offset);
ent.type = le16toh(ent.type);
ent.size = le16toh(ent.size);
out = calloc(1, sizeof(*out) + ent.size + 2);
if (out == NULL)
return SQFS_ERROR_ALLOC;
*out = ent;
err = sqfs_meta_reader_read(m, out->name, ent.size + 1);
if (err) {
free(out);
return err;
}
*result = out;
return 0;
}
int sqfs_readdir_state_init(sqfs_readdir_state_t *s, const sqfs_super_t *super,
const sqfs_inode_generic_t *inode)
{
memset(s, 0, sizeof(*s));
if (inode->base.type == SQFS_INODE_DIR) {
s->init.block = inode->data.dir.start_block;
s->init.offset = inode->data.dir.offset;
s->init.size = inode->data.dir.size;
} else if (inode->base.type == SQFS_INODE_EXT_DIR) {
s->init.block = inode->data.dir_ext.start_block;
s->init.offset = inode->data.dir_ext.offset;
s->init.size = inode->data.dir_ext.size;
} else {
return SQFS_ERROR_NOT_DIR;
}
s->init.block += super->directory_table_start;
s->current = s->init;
return 0;
}
int sqfs_meta_reader_readdir(sqfs_meta_reader_t *m, sqfs_readdir_state_t *it,
sqfs_dir_entry_t **ent,
sqfs_u32 *inum, sqfs_u64 *iref)
{
size_t count;
int ret;
if (it->entries == 0) {
sqfs_dir_header_t hdr;
if (it->current.size <= sizeof(hdr))
goto out_eof;
ret = sqfs_meta_reader_seek(m, it->current.block,
it->current.offset);
if (ret != 0)
return ret;
ret = sqfs_meta_reader_read_dir_header(m, &hdr);
if (ret != 0)
return ret;
sqfs_meta_reader_get_position(m, &it->current.block,
&it->current.offset);
it->current.size -= sizeof(hdr);
it->entries = hdr.count + 1;
it->inum_base = hdr.inode_number;
it->inode_block = hdr.start_block;
}
if (it->current.size <= sizeof(**ent))
goto out_eof;
ret = sqfs_meta_reader_seek(m, it->current.block, it->current.offset);
if (ret != 0)
return ret;
ret = sqfs_meta_reader_read_dir_ent(m, ent);
if (ret)
return ret;
sqfs_meta_reader_get_position(m, &it->current.block,
&it->current.offset);
it->current.size -= sizeof(**ent);
it->entries -= 1;
count = (*ent)->size + 1;
if (count >= it->current.size) {
it->current.size = 0;
} else {
it->current.size -= count;
}
if (inum != NULL)
*inum = it->inum_base + (*ent)->inode_diff;
if (iref != NULL) {
*iref = (sqfs_u64)it->inode_block << 16UL;
*iref |= (*ent)->offset;
}
return 0;
out_eof:
it->current.size = 0;
it->entries = 0;
return 1;
}
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