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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* inode.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include "sqfs/inode.h"
#include "sqfs/error.h"
#include "sqfs/dir.h"
#include <string.h>
#include <stdlib.h>
#include "util/util.h"
static int inverse_type[] = {
[SQFS_INODE_DIR] = SQFS_INODE_EXT_DIR,
[SQFS_INODE_FILE] = SQFS_INODE_EXT_FILE,
[SQFS_INODE_SLINK] = SQFS_INODE_EXT_SLINK,
[SQFS_INODE_BDEV] = SQFS_INODE_EXT_BDEV,
[SQFS_INODE_CDEV] = SQFS_INODE_EXT_CDEV,
[SQFS_INODE_FIFO] = SQFS_INODE_EXT_FIFO,
[SQFS_INODE_SOCKET] = SQFS_INODE_EXT_SOCKET,
[SQFS_INODE_EXT_DIR] = SQFS_INODE_DIR,
[SQFS_INODE_EXT_FILE] = SQFS_INODE_FILE,
[SQFS_INODE_EXT_SLINK] = SQFS_INODE_SLINK,
[SQFS_INODE_EXT_BDEV] = SQFS_INODE_BDEV,
[SQFS_INODE_EXT_CDEV] = SQFS_INODE_CDEV,
[SQFS_INODE_EXT_FIFO] = SQFS_INODE_FIFO,
[SQFS_INODE_EXT_SOCKET] = SQFS_INODE_SOCKET,
};
int sqfs_inode_get_xattr_index(const sqfs_inode_generic_t *inode,
sqfs_u32 *out)
{
switch (inode->base.type) {
case SQFS_INODE_DIR:
case SQFS_INODE_FILE:
case SQFS_INODE_SLINK:
case SQFS_INODE_BDEV:
case SQFS_INODE_CDEV:
case SQFS_INODE_FIFO:
case SQFS_INODE_SOCKET:
*out = 0xFFFFFFFF;
break;
case SQFS_INODE_EXT_DIR:
*out = inode->data.dir_ext.xattr_idx;
break;
case SQFS_INODE_EXT_FILE:
*out = inode->data.file_ext.xattr_idx;
break;
case SQFS_INODE_EXT_SLINK:
*out = inode->data.slink_ext.xattr_idx;
break;
case SQFS_INODE_EXT_BDEV:
case SQFS_INODE_EXT_CDEV:
*out = inode->data.dev_ext.xattr_idx;
break;
case SQFS_INODE_EXT_FIFO:
case SQFS_INODE_EXT_SOCKET:
*out = inode->data.ipc_ext.xattr_idx;
break;
default:
return SQFS_ERROR_CORRUPTED;
}
return 0;
}
int sqfs_inode_set_xattr_index(sqfs_inode_generic_t *inode, sqfs_u32 index)
{
int err;
if (index != 0xFFFFFFFF) {
err = sqfs_inode_make_extended(inode);
if (err)
return err;
}
switch (inode->base.type) {
case SQFS_INODE_DIR:
case SQFS_INODE_FILE:
case SQFS_INODE_SLINK:
case SQFS_INODE_BDEV:
case SQFS_INODE_CDEV:
case SQFS_INODE_FIFO:
case SQFS_INODE_SOCKET:
break;
case SQFS_INODE_EXT_DIR:
inode->data.dir_ext.xattr_idx = index;
break;
case SQFS_INODE_EXT_FILE:
inode->data.file_ext.xattr_idx = index;
break;
case SQFS_INODE_EXT_SLINK:
inode->data.slink_ext.xattr_idx = index;
break;
case SQFS_INODE_EXT_BDEV:
case SQFS_INODE_EXT_CDEV:
inode->data.dev_ext.xattr_idx = index;
break;
case SQFS_INODE_EXT_FIFO:
case SQFS_INODE_EXT_SOCKET:
inode->data.ipc_ext.xattr_idx = index;
break;
default:
return SQFS_ERROR_CORRUPTED;
}
return 0;
}
int sqfs_inode_make_extended(sqfs_inode_generic_t *inode)
{
switch (inode->base.type) {
case SQFS_INODE_DIR: {
sqfs_inode_dir_ext_t temp = {
.nlink = inode->data.dir.nlink,
.size = inode->data.dir.size,
.start_block = inode->data.dir.start_block,
.parent_inode = inode->data.dir.parent_inode,
.inodex_count = 0,
.offset = inode->data.dir.offset,
.xattr_idx = 0xFFFFFFFF,
};
inode->data.dir_ext = temp;
break;
}
case SQFS_INODE_FILE: {
sqfs_inode_file_ext_t temp = {
.blocks_start = inode->data.file.blocks_start,
.file_size = inode->data.file.file_size,
.sparse = 0,
.nlink = 1,
.fragment_idx = inode->data.file.fragment_index,
.fragment_offset = inode->data.file.fragment_offset,
.xattr_idx = 0xFFFFFFFF,
};
inode->data.file_ext = temp;
break;
}
case SQFS_INODE_SLINK:
inode->data.slink_ext.xattr_idx = 0xFFFFFFFF;
break;
case SQFS_INODE_BDEV:
case SQFS_INODE_CDEV:
inode->data.dev_ext.xattr_idx = 0xFFFFFFFF;
break;
case SQFS_INODE_FIFO:
case SQFS_INODE_SOCKET:
inode->data.dev_ext.xattr_idx = 0xFFFFFFFF;
break;
case SQFS_INODE_EXT_DIR:
case SQFS_INODE_EXT_FILE:
case SQFS_INODE_EXT_SLINK:
case SQFS_INODE_EXT_BDEV:
case SQFS_INODE_EXT_CDEV:
case SQFS_INODE_EXT_FIFO:
case SQFS_INODE_EXT_SOCKET:
return 0;
default:
return SQFS_ERROR_CORRUPTED;
}
inode->base.type = inverse_type[inode->base.type];
return 0;
}
int sqfs_inode_make_basic(sqfs_inode_generic_t *inode)
{
sqfs_u32 xattr;
int err;
err = sqfs_inode_get_xattr_index(inode, &xattr);
if (err != 0 || xattr != 0xFFFFFFFF)
return err;
switch (inode->base.type) {
case SQFS_INODE_DIR:
case SQFS_INODE_FILE:
case SQFS_INODE_SLINK:
case SQFS_INODE_BDEV:
case SQFS_INODE_CDEV:
case SQFS_INODE_FIFO:
case SQFS_INODE_SOCKET:
return 0;
case SQFS_INODE_EXT_DIR: {
sqfs_inode_dir_t temp = {
.start_block = inode->data.dir_ext.start_block,
.nlink = inode->data.dir_ext.nlink,
.size = inode->data.dir_ext.size,
.offset = inode->data.dir_ext.offset,
.parent_inode = inode->data.dir_ext.parent_inode,
};
if (inode->data.dir_ext.size > 0x0FFFF)
return 0;
inode->data.dir = temp;
break;
}
case SQFS_INODE_EXT_FILE: {
sqfs_inode_file_t temp = {
.blocks_start = inode->data.file_ext.blocks_start,
.fragment_index = inode->data.file_ext.fragment_idx,
.fragment_offset = inode->data.file_ext.fragment_offset,
.file_size = inode->data.file_ext.file_size,
};
if (inode->data.file_ext.blocks_start > 0x0FFFFFFFFUL)
return 0;
if (inode->data.file_ext.file_size > 0x0FFFFFFFFUL)
return 0;
if (inode->data.file_ext.sparse > 0)
return 0;
if (inode->data.file_ext.nlink > 1)
return 0;
inode->data.file = temp;
break;
}
case SQFS_INODE_EXT_SLINK:
case SQFS_INODE_EXT_BDEV:
case SQFS_INODE_EXT_CDEV:
case SQFS_INODE_EXT_FIFO:
case SQFS_INODE_EXT_SOCKET:
break;
default:
return SQFS_ERROR_CORRUPTED;
}
inode->base.type = inverse_type[inode->base.type];
return 0;
}
int sqfs_inode_set_file_size(sqfs_inode_generic_t *inode, sqfs_u64 size)
{
if (inode->base.type == SQFS_INODE_EXT_FILE) {
inode->data.file_ext.file_size = size;
if (size < 0x0FFFFFFFFUL)
sqfs_inode_make_basic(inode);
} else if (inode->base.type == SQFS_INODE_FILE) {
if (size > 0x0FFFFFFFFUL) {
sqfs_inode_make_extended(inode);
inode->data.file_ext.file_size = size;
} else {
inode->data.file.file_size = size;
}
} else {
return SQFS_ERROR_NOT_FILE;
}
return 0;
}
int sqfs_inode_set_frag_location(sqfs_inode_generic_t *inode,
sqfs_u32 index, sqfs_u32 offset)
{
if (inode->base.type == SQFS_INODE_EXT_FILE) {
inode->data.file_ext.fragment_idx = index;
inode->data.file_ext.fragment_offset = offset;
} else if (inode->base.type == SQFS_INODE_FILE) {
inode->data.file.fragment_index = index;
inode->data.file.fragment_offset = offset;
} else {
return SQFS_ERROR_NOT_FILE;
}
return 0;
}
int sqfs_inode_set_file_block_start(sqfs_inode_generic_t *inode,
sqfs_u64 location)
{
if (inode->base.type == SQFS_INODE_EXT_FILE) {
inode->data.file_ext.blocks_start = location;
if (location < 0x0FFFFFFFFUL)
sqfs_inode_make_basic(inode);
} else if (inode->base.type == SQFS_INODE_FILE) {
if (location > 0x0FFFFFFFFUL) {
sqfs_inode_make_extended(inode);
inode->data.file_ext.blocks_start = location;
} else {
inode->data.file.blocks_start = location;
}
} else {
return SQFS_ERROR_NOT_FILE;
}
return 0;
}
int sqfs_inode_get_file_size(const sqfs_inode_generic_t *inode, sqfs_u64 *size)
{
if (inode->base.type == SQFS_INODE_EXT_FILE) {
*size = inode->data.file_ext.file_size;
} else if (inode->base.type == SQFS_INODE_FILE) {
*size = inode->data.file.file_size;
} else {
return SQFS_ERROR_NOT_FILE;
}
return 0;
}
int sqfs_inode_get_frag_location(const sqfs_inode_generic_t *inode,
sqfs_u32 *index, sqfs_u32 *offset)
{
if (inode->base.type == SQFS_INODE_EXT_FILE) {
*index = inode->data.file_ext.fragment_idx;
*offset = inode->data.file_ext.fragment_offset;
} else if (inode->base.type == SQFS_INODE_FILE) {
*index = inode->data.file.fragment_index;
*offset = inode->data.file.fragment_offset;
} else {
return SQFS_ERROR_NOT_FILE;
}
return 0;
}
int sqfs_inode_get_file_block_start(const sqfs_inode_generic_t *inode,
sqfs_u64 *location)
{
if (inode->base.type == SQFS_INODE_EXT_FILE) {
*location = inode->data.file_ext.blocks_start;
} else if (inode->base.type == SQFS_INODE_FILE) {
*location = inode->data.file.blocks_start;
} else {
return SQFS_ERROR_NOT_FILE;
}
return 0;
}
int sqfs_inode_unpack_dir_index_entry(const sqfs_inode_generic_t *inode,
sqfs_dir_index_t **out,
size_t index)
{
sqfs_dir_index_t ent;
const char *ptr;
size_t offset;
if (inode->base.type != SQFS_INODE_EXT_DIR) {
if (inode->base.type == SQFS_INODE_DIR)
return SQFS_ERROR_OUT_OF_BOUNDS;
return SQFS_ERROR_NOT_DIR;
}
offset = 0;
ptr = (const char *)inode->extra;
for (;;) {
if (offset >= inode->payload_bytes_used)
return SQFS_ERROR_OUT_OF_BOUNDS;
if (index == 0)
break;
memcpy(&ent, ptr + offset, sizeof(ent));
offset += sizeof(ent) + ent.size + 1;
index -= 1;
}
memcpy(&ent, ptr + offset, sizeof(ent));
*out = alloc_flex(sizeof(ent), 1, ent.size + 2);
if (*out == NULL)
return SQFS_ERROR_ALLOC;
memcpy(*out, &ent, sizeof(ent));
memcpy((*out)->name, ptr + offset + sizeof(ent), ent.size + 1);
return 0;
}
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