108 lines
4.2 KiB
C
108 lines
4.2 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 "duplex_storage.h"
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#include <gfx_utils.h>
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#include <mem/heap.h>
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void save_duplex_storage_init(duplex_storage_ctx_t *ctx, uint8_t *data_a, uint8_t *data_b, uint32_t block_size_power, void *bitmap, uint64_t bitmap_size) {
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substorage_init(&ctx->data_a, &memory_storage_vt, data_a, 0, ctx->_length);
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substorage_init(&ctx->data_b, &memory_storage_vt, data_b, 0, ctx->_length);
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substorage_init(&ctx->bitmap_storage, &memory_storage_vt, bitmap, 0, bitmap_size);
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ctx->block_size = 1 << block_size_power;
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ctx->bitmap.data = (uint8_t *)bitmap;
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ctx->bitmap.bitmap = malloc(bitmap_size >> 3);
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uint32_t bits_remaining = (uint32_t)bitmap_size;
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uint32_t bitmap_pos = 0;
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uint32_t *buffer_pos = (uint32_t *)ctx->bitmap.data;
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while (bits_remaining) {
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uint32_t bits_to_read = MIN(bits_remaining, 0x20);
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uint32_t val = *buffer_pos;
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for (uint32_t i = 0; i < bits_to_read; i++) {
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if (val & 0x80000000)
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save_bitmap_set_bit(ctx->bitmap.bitmap, bitmap_pos);
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else
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save_bitmap_clear_bit(ctx->bitmap.bitmap, bitmap_pos);
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bitmap_pos++;
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bits_remaining--;
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val <<= 1;
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}
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buffer_pos++;
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}
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}
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uint32_t save_duplex_storage_read(duplex_storage_ctx_t *ctx, void *buffer, uint64_t offset, uint64_t count) {
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uint64_t in_pos = offset;
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uint32_t out_pos = 0;
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uint32_t remaining = count;
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while (remaining) {
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uint32_t block_num = (uint32_t)(in_pos / ctx->block_size);
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uint32_t block_pos = (uint32_t)(in_pos % ctx->block_size);
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uint32_t bytes_to_read = MIN(ctx->block_size - block_pos, remaining);
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substorage *data = save_bitmap_check_bit(ctx->bitmap.bitmap, block_num) ? &ctx->data_b : &ctx->data_a;
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if (substorage_read(data, (uint8_t *)buffer + out_pos, in_pos, bytes_to_read) != bytes_to_read)
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return 0;
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out_pos += bytes_to_read;
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in_pos += bytes_to_read;
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remaining -= bytes_to_read;
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}
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return out_pos;
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}
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uint32_t save_duplex_storage_write(duplex_storage_ctx_t *ctx, const void *buffer, uint64_t offset, uint64_t count) {
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uint64_t in_pos = offset;
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uint32_t out_pos = 0;
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uint32_t remaining = count;
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while (remaining) {
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uint32_t block_num = (uint32_t)(in_pos / ctx->block_size);
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uint32_t block_pos = (uint32_t)(in_pos % ctx->block_size);
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uint32_t bytes_to_write = MIN(ctx->block_size - block_pos, remaining);
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substorage *data = save_bitmap_check_bit(ctx->bitmap.bitmap, block_num) ? &ctx->data_b : &ctx->data_a;
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if (substorage_write(data, (uint8_t *)buffer + out_pos, in_pos, bytes_to_write) != bytes_to_write)
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return 0;
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out_pos += bytes_to_write;
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in_pos += bytes_to_write;
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remaining -= bytes_to_write;
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}
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return out_pos;
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} |