mirror of
https://github.com/Decscots/Lockpick_RCM
synced 2024-11-25 10:39:25 +00:00
112 lines
3.8 KiB
C
112 lines
3.8 KiB
C
|
/*
|
||
|
* Copyright (c) 2019-2020 shchmue
|
||
|
*
|
||
|
* This program is free software; you can redistribute it and/or modify it
|
||
|
* under the terms and conditions of the GNU General Public License,
|
||
|
* version 2, as published by the Free Software Foundation.
|
||
|
*
|
||
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
||
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||
|
* more details.
|
||
|
*
|
||
|
* You should have received a copy of the GNU General Public License
|
||
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
*/
|
||
|
|
||
|
/*
|
||
|
ISC License
|
||
|
|
||
|
hactool Copyright (c) 2018, SciresM
|
||
|
|
||
|
Permission to use, copy, modify, and/or distribute this software for any
|
||
|
purpose with or without fee is hereby granted, provided that the above
|
||
|
copyright notice and this permission notice appear in all copies.
|
||
|
|
||
|
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||
|
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||
|
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
||
|
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||
|
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||
|
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
||
|
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||
|
*/
|
||
|
|
||
|
#include "allocation_table_iterator.h"
|
||
|
|
||
|
#include <gfx_utils.h>
|
||
|
|
||
|
bool save_allocation_table_iterator_begin(allocation_table_iterator_ctx_t *ctx, allocation_table_ctx_t *table, uint32_t initial_block) {
|
||
|
ctx->fat = table;
|
||
|
ctx->physical_block = initial_block;
|
||
|
ctx->virtual_block = 0;
|
||
|
|
||
|
allocation_table_entry_t entry;
|
||
|
ctx->current_segment_size = save_allocation_table_read_entry_with_length(ctx->fat, initial_block, &entry);
|
||
|
if (ctx->current_segment_size == 0) {
|
||
|
EPRINTF("Invalid entry detected in allocation table!");
|
||
|
return false;
|
||
|
}
|
||
|
ctx->next_block = entry.next;
|
||
|
ctx->prev_block = entry.prev;
|
||
|
|
||
|
if (ctx->prev_block != 0xFFFFFFFF) {
|
||
|
EPRINTFARGS("Attempted to start FAT iteration from\n invalid block %x!", initial_block);
|
||
|
return false;
|
||
|
}
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
bool save_allocation_table_iterator_move_next(allocation_table_iterator_ctx_t *ctx) {
|
||
|
if (ctx->next_block == 0xFFFFFFFF)
|
||
|
return false;
|
||
|
|
||
|
ctx->virtual_block += ctx->current_segment_size;
|
||
|
ctx->physical_block = ctx->next_block;
|
||
|
|
||
|
allocation_table_entry_t entry;
|
||
|
ctx->current_segment_size = save_allocation_table_read_entry_with_length(ctx->fat, ctx->next_block, &entry);
|
||
|
if (ctx->current_segment_size == 0) {
|
||
|
EPRINTF("Invalid entry detected in allocation table!");
|
||
|
return false;
|
||
|
}
|
||
|
ctx->next_block = entry.next;
|
||
|
ctx->prev_block = entry.prev;
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
bool save_allocation_table_iterator_move_prev(allocation_table_iterator_ctx_t *ctx) {
|
||
|
if (ctx->prev_block == 0xFFFFFFFF)
|
||
|
return false;
|
||
|
|
||
|
ctx->physical_block = ctx->prev_block;
|
||
|
|
||
|
allocation_table_entry_t entry;
|
||
|
ctx->current_segment_size = save_allocation_table_read_entry_with_length(ctx->fat, ctx->prev_block, &entry);
|
||
|
if (ctx->current_segment_size == 0) {
|
||
|
EPRINTF("Invalid entry detected in allocation table!");
|
||
|
return false;
|
||
|
}
|
||
|
ctx->next_block = entry.next;
|
||
|
ctx->prev_block = entry.prev;
|
||
|
|
||
|
ctx->virtual_block -= ctx->current_segment_size;
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
bool save_allocation_table_iterator_seek(allocation_table_iterator_ctx_t *ctx, uint32_t block) {
|
||
|
for ( ; ; ) {
|
||
|
if (block < ctx->virtual_block) {
|
||
|
if (!save_allocation_table_iterator_move_prev(ctx))
|
||
|
return false;
|
||
|
} else if (block >= ctx->virtual_block + ctx->current_segment_size) {
|
||
|
if (!save_allocation_table_iterator_move_next(ctx))
|
||
|
return false;
|
||
|
} else {
|
||
|
return true;
|
||
|
}
|
||
|
}
|
||
|
}
|