mirror of
https://github.com/suchmememanyskill/TegraExplorer.git
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132 lines
4.3 KiB
C
132 lines
4.3 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 "save_data_file.h"
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#include <gfx_utils.h>
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void save_data_file_init(save_data_file_ctx_t *ctx, allocation_table_storage_ctx_t *base_storage, const char *path, hierarchical_save_file_table_ctx_t *file_table, uint64_t size, open_mode_t mode) {
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ctx->mode = mode;
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memcpy(&ctx->base_storage, base_storage, sizeof(allocation_table_storage_ctx_t));
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ctx->path = path;
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ctx->file_table = file_table;
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ctx->size = size;
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}
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bool save_data_file_validate_read_params(save_data_file_ctx_t *ctx, uint64_t *out_bytes_to_read, uint64_t offset, uint32_t size, open_mode_t open_mode) {
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*out_bytes_to_read = 0;
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if ((open_mode & OPEN_MODE_READ) == 0)
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return false;
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uint64_t file_size = ctx->size;
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if (offset > file_size)
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return false;
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*out_bytes_to_read = MIN(file_size - offset, size);
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return true;
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}
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bool save_data_file_validate_write_params(save_data_file_ctx_t *ctx, uint64_t offset, uint32_t size, open_mode_t open_mode, bool *out_is_resize_needed) {
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*out_is_resize_needed = false;
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if ((open_mode & OPEN_MODE_WRITE) == 0)
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return false;
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uint64_t file_size = ctx->size;
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if (offset + size > file_size) {
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*out_is_resize_needed = true;
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if ((open_mode & OPEN_MODE_ALLOW_APPEND) == 0)
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return false;
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}
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return true;
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}
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bool save_data_file_read(save_data_file_ctx_t *ctx, uint64_t *out_bytes_read, uint64_t offset, void *buffer, uint64_t count) {
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uint64_t to_read = 0;
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if (!save_data_file_validate_read_params(ctx, &to_read, offset, count, ctx->mode))
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return false;
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if (to_read == 0) {
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*out_bytes_read = 0;
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return true;
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}
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*out_bytes_read = save_allocation_table_storage_read(&ctx->base_storage, buffer, offset, to_read);
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return true;
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}
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bool save_data_file_write(save_data_file_ctx_t *ctx, uint64_t *out_bytes_written, uint64_t offset, const void *buffer, uint64_t count) {
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bool is_resize_needed;
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if (!save_data_file_validate_write_params(ctx, offset, count, ctx->mode, &is_resize_needed))
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return false;
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if (is_resize_needed) {
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if (!save_data_file_set_size(ctx, offset + count))
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return false;
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}
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*out_bytes_written = save_allocation_table_storage_write(&ctx->base_storage, buffer, offset, count);
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return true;
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}
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bool save_data_file_set_size(save_data_file_ctx_t *ctx, uint64_t size) {
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if (ctx->size == size)
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return true;
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save_allocation_table_storage_set_size(&ctx->base_storage, size);
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save_file_info_t file_info;
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if (!save_hierarchical_file_table_try_open_file(ctx->file_table, ctx->path, &file_info)) {
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EPRINTF("File not found!");
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return false;
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}
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file_info.start_block = ctx->base_storage.initial_block;
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fs_int64_set(&file_info.length, size);
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if (!save_hierarchical_file_table_add_file(ctx->file_table, ctx->path, &file_info))
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return false;
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ctx->size = size;
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return true;
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}
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