mirror of
https://github.com/shchmue/Lockpick_RCM.git
synced 2024-06-26 20:56:07 +02:00
172 lines
6.6 KiB
C
172 lines
6.6 KiB
C
/*
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* Copyright (c) 2019-2020 shchmue
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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ISC License
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hactool Copyright (c) 2018, SciresM
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _ALLOCATION_TABLE_H_
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#define _ALLOCATION_TABLE_H_
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#include "storage.h"
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#include <assert.h>
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#include <stdint.h>
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#include <string.h>
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#define SAVE_FAT_ENTRY_SIZE 8
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typedef struct {
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uint64_t offset;
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uint32_t count;
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uint32_t _0xC;
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} storage_info_t;
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typedef struct {
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uint64_t block_size;
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storage_info_t fat_storage_info;
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storage_info_t data_storage_info;
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uint32_t directory_table_block;
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uint32_t file_table_block;
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} allocation_table_header_t;
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static_assert(sizeof(allocation_table_header_t) == 0x30, "Allocation table header size is wrong!");
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typedef struct {
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uint32_t prev;
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uint32_t next;
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} allocation_table_entry_t;
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typedef struct {
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uint32_t free_list_entry_index;
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void *base_storage;
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allocation_table_header_t *header;
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} allocation_table_ctx_t;
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static ALWAYS_INLINE uint32_t allocation_table_entry_index_to_block(uint32_t entry_index) {
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return entry_index - 1;
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}
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static ALWAYS_INLINE uint32_t allocation_table_block_to_entry_index(uint32_t block_index) {
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return block_index + 1;
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}
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static ALWAYS_INLINE int allocation_table_get_prev(allocation_table_entry_t *entry) {
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return entry->prev & 0x7FFFFFFF;
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}
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static ALWAYS_INLINE int allocation_table_get_next(allocation_table_entry_t *entry) {
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return entry->next & 0x7FFFFFFF;
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}
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static ALWAYS_INLINE int allocation_table_is_list_start(allocation_table_entry_t *entry) {
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return entry->prev == 0x80000000;
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}
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static ALWAYS_INLINE int allocation_table_is_list_end(allocation_table_entry_t *entry) {
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return (entry->next & 0x7FFFFFFF) == 0;
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}
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static ALWAYS_INLINE bool allocation_table_is_multi_block_segment(allocation_table_entry_t *entry) {
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return entry->next & 0x80000000;
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}
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static ALWAYS_INLINE void allocation_table_make_multi_block_segment(allocation_table_entry_t *entry) {
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entry->next |= 0x80000000;
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}
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static ALWAYS_INLINE void allocation_table_make_single_block_segment(allocation_table_entry_t *entry) {
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entry->next &= 0x7FFFFFFF;
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}
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static ALWAYS_INLINE bool allocation_table_is_single_block_segment(allocation_table_entry_t *entry) {
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return (entry->next & 0x80000000) == 0;
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}
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static ALWAYS_INLINE void allocation_table_make_list_start(allocation_table_entry_t *entry) {
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entry->prev = 0x80000000;
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}
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static ALWAYS_INLINE bool allocation_table_is_range_entry(allocation_table_entry_t *entry) {
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return (entry->prev & 0x80000000) == 0x80000000 && entry->prev != 0x80000000;
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}
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static ALWAYS_INLINE void allocation_table_make_range_entry(allocation_table_entry_t *entry) {
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entry->prev |= 0x80000000;
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}
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static ALWAYS_INLINE void allocation_table_set_next(allocation_table_entry_t *entry, int val) {
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entry->next = (entry->next & 0x80000000) | val;
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}
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static ALWAYS_INLINE void allocation_table_set_prev(allocation_table_entry_t *entry, int val) {
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entry->prev = val;
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}
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static ALWAYS_INLINE void allocation_table_set_range(allocation_table_entry_t *entry, int start_index, int end_index) {
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entry->next = end_index;
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entry->prev = start_index;
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allocation_table_make_range_entry(entry);
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}
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static ALWAYS_INLINE uint64_t allocation_table_query_size(uint32_t block_count) {
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return SAVE_FAT_ENTRY_SIZE * allocation_table_block_to_entry_index(block_count);
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}
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static ALWAYS_INLINE allocation_table_entry_t *save_allocation_table_read_entry(allocation_table_ctx_t *ctx, uint32_t entry_index) {
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return (allocation_table_entry_t *)((uint8_t *)ctx->base_storage + entry_index * SAVE_FAT_ENTRY_SIZE);
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}
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static ALWAYS_INLINE void save_allocation_table_write_entry(allocation_table_ctx_t *ctx, uint32_t entry_index, allocation_table_entry_t *entry) {
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memcpy((uint8_t *)ctx->base_storage + entry_index * SAVE_FAT_ENTRY_SIZE, entry, SAVE_FAT_ENTRY_SIZE);
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}
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static ALWAYS_INLINE uint32_t save_allocation_table_get_free_list_entry_index(allocation_table_ctx_t *ctx) {
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return allocation_table_get_next(save_allocation_table_read_entry(ctx, ctx->free_list_entry_index));
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}
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static ALWAYS_INLINE uint32_t save_allocation_table_get_free_list_block_index(allocation_table_ctx_t *ctx) {
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return allocation_table_entry_index_to_block(save_allocation_table_get_free_list_entry_index(ctx));
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}
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void save_allocation_table_init(allocation_table_ctx_t *ctx, void *storage, allocation_table_header_t *header);
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void save_allocation_table_set_free_list_entry_index(allocation_table_ctx_t *ctx, uint32_t head_block_index);
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void save_allocation_table_set_free_list_block_index(allocation_table_ctx_t *ctx, uint32_t head_block_index);
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bool save_allocation_table_split(allocation_table_ctx_t *ctx, uint32_t segment_block_index, uint32_t first_sub_segment_length);
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uint32_t save_allocation_table_trim(allocation_table_ctx_t *ctx, uint32_t list_head_block_index, uint32_t new_list_length);
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bool save_allocation_table_join(allocation_table_ctx_t *ctx, uint32_t front_list_block_index, uint32_t back_list_block_index);
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uint32_t save_allocation_table_allocate(allocation_table_ctx_t *ctx, uint32_t block_count);
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bool save_allocation_table_free(allocation_table_ctx_t *ctx, uint32_t list_block_index);
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uint32_t save_allocation_table_read_entry_with_length(allocation_table_ctx_t *ctx, uint32_t block_index, allocation_table_entry_t *entry);
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uint32_t save_allocation_table_get_list_length(allocation_table_ctx_t *ctx, uint32_t block_index);
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uint32_t save_allocation_table_get_free_list_length(allocation_table_ctx_t *ctx);
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#endif
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