Huge savedata driver refactor

bdk/libs/nx_savedata/journal_storage.c

@@ -0,0 +1,92 @@
+/*
+ * 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 "journal_storage.h"
+
+#include "header.h"
+
+#include <gfx_utils.h>
+#include <mem/heap.h>
+
+#include <string.h>
+
+void save_journal_storage_init(journal_storage_ctx_t *ctx, substorage *base_storage, journal_header_t *header, journal_map_params_t *map_info) {
+    memcpy(&ctx->base_storage, base_storage, sizeof(substorage));
+    ctx->header = header;
+    save_journal_map_init(&ctx->map, &header->map_header, map_info);
+    ctx->block_size = (uint32_t)header->block_size;
+    ctx->length = header->total_size - header->journal_size;
+}
+
+uint32_t save_journal_storage_read(journal_storage_ctx_t *ctx, void *buffer, uint64_t offset, uint64_t count) {
+    uint64_t in_pos = offset;
+    uint32_t out_pos = 0;
+    uint32_t remaining = count;
+
+    while (remaining) {
+        uint32_t block_num = (uint32_t)(in_pos / ctx->block_size);
+        uint32_t block_pos = (uint32_t)(in_pos % ctx->block_size);
+        uint64_t physical_offset = ctx->map.entries[block_num].physical_index * ctx->block_size + block_pos;
+        uint32_t bytes_to_read = MIN(ctx->block_size - block_pos, remaining);
+
+        if (substorage_read(&ctx->base_storage, (uint8_t *)buffer + out_pos, physical_offset, bytes_to_read) != bytes_to_read)
+            return 0;
+
+        out_pos += bytes_to_read;
+        in_pos += bytes_to_read;
+        remaining -= bytes_to_read;
+    }
+    return out_pos;
+}
+
+uint32_t save_journal_storage_write(journal_storage_ctx_t *ctx, const void *buffer, uint64_t offset, uint64_t count) {
+    uint64_t in_pos = offset;
+    uint32_t out_pos = 0;
+    uint32_t remaining = count;
+
+    while (remaining) {
+        uint32_t block_num = (uint32_t)(in_pos / ctx->block_size);
+        uint32_t block_pos = (uint32_t)(in_pos % ctx->block_size);
+        uint64_t physical_offset = ctx->map.entries[block_num].physical_index * ctx->block_size + block_pos;
+        uint32_t bytes_to_write = MIN(ctx->block_size - block_pos, remaining);
+
+        if (substorage_write(&ctx->base_storage, (uint8_t *)buffer + out_pos, physical_offset, bytes_to_write) != bytes_to_write)
+            return 0;
+
+        out_pos += bytes_to_write;
+        in_pos += bytes_to_write;
+        remaining -= bytes_to_write;
+    }
+    return out_pos;
+}