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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 Bootlin
*
* Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
*/
#include <asm/unaligned.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "sqfs_decompressor.h"
#include "sqfs_filesystem.h"
#include "sqfs_utils.h"
int sqfs_inode_size(struct squashfs_base_inode *inode, u32 blk_size)
{
switch (get_unaligned_le16(&inode->inode_type)) {
case SQFS_DIR_TYPE:
return sizeof(struct squashfs_dir_inode);
case SQFS_REG_TYPE: {
struct squashfs_reg_inode *reg =
(struct squashfs_reg_inode *)inode;
u32 fragment = get_unaligned_le32(®->fragment);
u32 file_size = get_unaligned_le32(®->file_size);
unsigned int blk_list_size;
if (SQFS_IS_FRAGMENTED(fragment))
blk_list_size = file_size / blk_size;
else
blk_list_size = DIV_ROUND_UP(file_size, blk_size);
return sizeof(*reg) + blk_list_size * sizeof(u32);
}
case SQFS_LDIR_TYPE: {
struct squashfs_ldir_inode *ldir =
(struct squashfs_ldir_inode *)inode;
u16 i_count = get_unaligned_le16(&ldir->i_count);
unsigned int index_list_size = 0, l = 0;
struct squashfs_directory_index *di;
u32 sz;
if (i_count == 0)
return sizeof(*ldir);
di = ldir->index;
while (l < i_count + 1) {
sz = get_unaligned_le32(&di->size) + 1;
index_list_size += sz;
di = (void *)di + sizeof(*di) + sz;
l++;
}
return sizeof(*ldir) + index_list_size +
(i_count + 1) * SQFS_DIR_INDEX_BASE_LENGTH;
}
case SQFS_LREG_TYPE: {
struct squashfs_lreg_inode *lreg =
(struct squashfs_lreg_inode *)inode;
u32 fragment = get_unaligned_le32(&lreg->fragment);
u64 file_size = get_unaligned_le64(&lreg->file_size);
unsigned int blk_list_size;
if (fragment == 0xFFFFFFFF)
blk_list_size = DIV_ROUND_UP(file_size, blk_size);
else
blk_list_size = file_size / blk_size;
return sizeof(*lreg) + blk_list_size * sizeof(u32);
}
case SQFS_SYMLINK_TYPE:
case SQFS_LSYMLINK_TYPE: {
struct squashfs_symlink_inode *symlink =
(struct squashfs_symlink_inode *)inode;
return sizeof(*symlink) +
get_unaligned_le32(&symlink->symlink_size);
}
case SQFS_BLKDEV_TYPE:
case SQFS_CHRDEV_TYPE:
return sizeof(struct squashfs_dev_inode);
case SQFS_LBLKDEV_TYPE:
case SQFS_LCHRDEV_TYPE:
return sizeof(struct squashfs_ldev_inode);
case SQFS_FIFO_TYPE:
case SQFS_SOCKET_TYPE:
return sizeof(struct squashfs_ipc_inode);
case SQFS_LFIFO_TYPE:
case SQFS_LSOCKET_TYPE:
return sizeof(struct squashfs_lipc_inode);
default:
printf("Error while searching inode: unknown type.\n");
return -EINVAL;
}
}
/*
* Given the uncompressed inode table, the inode to be found and the number of
* inodes in the table, return inode position in case of success.
*/
void *sqfs_find_inode(void *inode_table, int inode_number, __le32 inode_count,
__le32 block_size)
{
struct squashfs_base_inode *base;
unsigned int offset = 0, k;
int sz;
if (!inode_table) {
printf("%s: Invalid pointer to inode table.\n", __func__);
return NULL;
}
for (k = 0; k < le32_to_cpu(inode_count); k++) {
base = inode_table + offset;
if (get_unaligned_le32(&base->inode_number) == inode_number)
return inode_table + offset;
sz = sqfs_inode_size(base, le32_to_cpu(block_size));
if (sz < 0)
return NULL;
offset += sz;
}
printf("Inode not found.\n");
return NULL;
}
int sqfs_read_metablock(unsigned char *file_mapping, int offset,
bool *compressed, u32 *data_size)
{
const unsigned char *data;
u16 header;
data = file_mapping + offset;
if (!data)
return -EFAULT;
header = get_unaligned((u16 *)data);
if (!header)
return -EINVAL;
*compressed = SQFS_COMPRESSED_METADATA(header);
*data_size = SQFS_METADATA_SIZE(header);
if (*data_size > SQFS_METADATA_BLOCK_SIZE) {
printf("Invalid metatada block size: %d bytes.\n", *data_size);
return -EINVAL;
}
return 0;
}
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