mirror of
https://github.com/suchmememanyskill/TegraExplorer.git
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281 lines
11 KiB
C
281 lines
11 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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#include "allocation_table.h"
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#include "allocation_table_iterator.h"
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#include <gfx_utils.h>
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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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ctx->base_storage = storage;
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ctx->header = header;
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ctx->free_list_entry_index = 0;
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}
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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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allocation_table_entry_t free_list = {0, head_block_index};
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save_allocation_table_write_entry(ctx, ctx->free_list_entry_index, &free_list);
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}
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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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save_allocation_table_set_free_list_entry_index(ctx, allocation_table_block_to_entry_index(head_block_index));
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}
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uint32_t save_allocation_table_get_list_tail(allocation_table_ctx_t *ctx, uint32_t entry_index) {
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uint32_t tail_index = entry_index;
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uint32_t table_size = ctx->header->fat_storage_info.count;
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uint32_t nodes_traversed = 0;
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allocation_table_entry_t *entry = save_allocation_table_read_entry(ctx, entry_index);
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while (!allocation_table_is_list_end(entry)) {
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nodes_traversed++;
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tail_index = allocation_table_get_next(entry);
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entry = save_allocation_table_read_entry(ctx, tail_index);
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if (nodes_traversed > table_size) {
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EPRINTF("Cycle detected in allocation table!");
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return 0xFFFFFFFF;
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}
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}
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return tail_index;
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}
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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 seg_a_index = allocation_table_block_to_entry_index(segment_block_index);
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allocation_table_entry_t *seg_a = save_allocation_table_read_entry(ctx, seg_a_index);
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if (!allocation_table_is_multi_block_segment(seg_a)) {
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EPRINTF("Cannot split a single-entry segment!");
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return false;
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}
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allocation_table_entry_t *seg_a_range = save_allocation_table_read_entry(ctx, seg_a_index + 1);
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uint32_t original_length = allocation_table_get_next(seg_a_range) - allocation_table_get_prev(seg_a_range) + 1;
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if (first_sub_segment_length >= original_length) {
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EPRINTFARGS("Requested sub-segment length (%x) must\n be less than the full segment length (%x)!", first_sub_segment_length, original_length);
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return false;
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}
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uint32_t seg_b_index = seg_a_index + first_sub_segment_length;
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uint32_t seg_a_length = first_sub_segment_length;
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uint32_t seg_b_length = original_length - seg_a_length;
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allocation_table_entry_t seg_b = {seg_a_index, allocation_table_get_next(seg_a)};
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allocation_table_set_next(seg_a, seg_b_index);
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if (!allocation_table_is_list_end(&seg_b)) {
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allocation_table_entry_t *seg_c = save_allocation_table_read_entry(ctx, allocation_table_get_next(&seg_b));
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allocation_table_set_prev(seg_c, seg_b_index);
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}
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if (seg_b_length > 1) {
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allocation_table_make_multi_block_segment(&seg_b);
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allocation_table_entry_t seg_b_range;
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allocation_table_set_range(&seg_b_range, seg_b_index, seg_b_index + seg_b_length - 1);
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save_allocation_table_write_entry(ctx, seg_b_index + 1, &seg_b_range);
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save_allocation_table_write_entry(ctx, seg_b_index + seg_b_length - 1, &seg_b_range);
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}
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save_allocation_table_write_entry(ctx, seg_b_index, &seg_b);
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if (seg_a_length == 1) {
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allocation_table_make_single_block_segment(seg_a);
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} else {
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allocation_table_set_range(seg_a_range, seg_a_index, seg_a_index + seg_a_length - 1);
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save_allocation_table_write_entry(ctx, seg_a_index + seg_a_length - 1, seg_a_range);
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}
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return true;
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}
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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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uint32_t blocks_remaining = new_list_length;
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uint32_t next_entry = allocation_table_block_to_entry_index(list_head_block_index);
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uint32_t list_a_index = 0xFFFFFFFF;
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uint32_t list_b_index = 0xFFFFFFFF;
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while (blocks_remaining > 0) {
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if (next_entry == 0)
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return 0xFFFFFFFF;
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uint32_t current_entry_index = next_entry;
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allocation_table_entry_t entry;
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uint32_t segment_length = save_allocation_table_read_entry_with_length(ctx, allocation_table_entry_index_to_block(current_entry_index), &entry);
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if (segment_length == 0) {
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EPRINTF("Invalid entry detected in allocation table!");
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return 0xFFFFFFFF;
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}
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next_entry = allocation_table_block_to_entry_index(entry.next);
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if (segment_length == blocks_remaining) {
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list_a_index = current_entry_index;
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list_b_index = next_entry;
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} else if (segment_length > blocks_remaining) {
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if (!save_allocation_table_split(ctx, allocation_table_entry_index_to_block(current_entry_index), blocks_remaining))
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return 0xFFFFFFFF;
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list_a_index = current_entry_index;
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list_b_index = current_entry_index + blocks_remaining;
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segment_length = blocks_remaining;
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}
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blocks_remaining -= segment_length;
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}
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if (list_a_index == 0xFFFFFFFF || list_b_index == 0xFFFFFFFF)
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return 0xFFFFFFFF;
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allocation_table_entry_t *list_a_node = save_allocation_table_read_entry(ctx, list_a_index);
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allocation_table_entry_t *list_b_node = save_allocation_table_read_entry(ctx, list_b_index);
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allocation_table_set_next(list_a_node, 0);
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allocation_table_make_list_start(list_b_node);
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return allocation_table_entry_index_to_block(list_b_index);
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}
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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 front_entry_index = allocation_table_block_to_entry_index(front_list_block_index);
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uint32_t back_entry_index = allocation_table_block_to_entry_index(back_list_block_index);
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uint32_t front_tail_index = save_allocation_table_get_list_tail(ctx, front_entry_index);
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if (front_tail_index == 0xFFFFFFFF)
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return false;
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allocation_table_entry_t *front_tail = save_allocation_table_read_entry(ctx, front_tail_index);
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allocation_table_entry_t *back_head = save_allocation_table_read_entry(ctx, back_entry_index);
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allocation_table_set_next(front_tail, back_entry_index);
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allocation_table_set_prev(back_head, front_tail_index);
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return true;
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}
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uint32_t save_allocation_table_allocate(allocation_table_ctx_t *ctx, uint32_t block_count) {
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uint32_t free_list = save_allocation_table_get_free_list_block_index(ctx);
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uint32_t new_free_list = save_allocation_table_trim(ctx, free_list, block_count);
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if (new_free_list == 0xFFFFFFFF)
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return 0xFFFFFFFF;
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save_allocation_table_set_free_list_block_index(ctx, new_free_list);
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return free_list;
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}
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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 list_entry_index = allocation_table_block_to_entry_index(list_block_index);
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allocation_table_entry_t *list_entry = save_allocation_table_read_entry(ctx, list_entry_index);
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if (!allocation_table_is_list_start(list_entry)) {
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EPRINTF("The block to free must be the start of a list!");
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return false;
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}
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uint32_t free_list_index = save_allocation_table_get_free_list_entry_index(ctx);
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if (free_list_index == 0) {
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save_allocation_table_set_free_list_entry_index(ctx, list_entry_index);
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return true;
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}
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save_allocation_table_join(ctx, list_block_index, allocation_table_entry_index_to_block(free_list_index));
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save_allocation_table_set_free_list_block_index(ctx, list_block_index);
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return true;
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}
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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 length;
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uint32_t entry_index = allocation_table_block_to_entry_index(block_index);
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allocation_table_entry_t *entries = save_allocation_table_read_entry(ctx, entry_index);
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if (allocation_table_is_single_block_segment(&entries[0])) {
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length = 1;
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if (allocation_table_is_range_entry(&entries[0])) {
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EPRINTF("Invalid range entry in allocation table!");
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return 0;
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}
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} else {
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length = entries[1].next - entry_index + 1;
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}
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if (allocation_table_is_list_end(&entries[0])) {
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entry->next = 0xFFFFFFFF;
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} else {
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entry->next = allocation_table_entry_index_to_block(allocation_table_get_next(&entries[0]));
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}
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if (allocation_table_is_list_start(&entries[0])) {
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entry->prev = 0xFFFFFFFF;
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} else {
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entry->prev = allocation_table_entry_index_to_block(allocation_table_get_prev(&entries[0]));
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}
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return length;
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}
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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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allocation_table_entry_t entry = {0, block_index};
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uint32_t total_length = 0;
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uint32_t table_size = ctx->header->fat_storage_info.count;
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uint32_t nodes_iterated = 0;
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while (entry.next != 0xFFFFFFFF) {
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uint32_t length = save_allocation_table_read_entry_with_length(ctx, entry.next, &entry);
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if (length == 0) {
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EPRINTF("Invalid entry detected in allocation table!");
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return 0;
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}
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total_length += length;
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nodes_iterated++;
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if (nodes_iterated > table_size) {
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EPRINTF("Cycle detected in allocation table!");
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return 0;
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}
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}
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return total_length;
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}
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uint32_t save_allocation_table_get_free_list_length(allocation_table_ctx_t *ctx) {
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uint32_t free_list_start = save_allocation_table_get_free_list_block_index(ctx);
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if (free_list_start == 0xFFFFFFFF)
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return 0;
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return save_allocation_table_get_list_length(ctx, free_list_start);
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}
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