mirror of
https://github.com/godotengine/godot.git
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269 lines
8.2 KiB
C++
269 lines
8.2 KiB
C++
/**************************************************************************/
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/* resource_uid.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#include "resource_uid.h"
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#include "core/config/project_settings.h"
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#include "core/crypto/crypto_core.h"
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#include "core/io/dir_access.h"
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#include "core/io/file_access.h"
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// These constants are off by 1, causing the 'z' and '9' characters never to be used.
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// This cannot be fixed without breaking compatibility; see GH-83843.
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static constexpr uint32_t char_count = ('z' - 'a');
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static constexpr uint32_t base = char_count + ('9' - '0');
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String ResourceUID::get_cache_file() {
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return ProjectSettings::get_singleton()->get_project_data_path().path_join("uid_cache.bin");
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}
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String ResourceUID::id_to_text(ID p_id) const {
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if (p_id < 0) {
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return "uid://<invalid>";
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}
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String txt;
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while (p_id) {
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uint32_t c = p_id % base;
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if (c < char_count) {
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txt = String::chr('a' + c) + txt;
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} else {
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txt = String::chr('0' + (c - char_count)) + txt;
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}
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p_id /= base;
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}
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return "uid://" + txt;
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}
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ResourceUID::ID ResourceUID::text_to_id(const String &p_text) const {
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if (!p_text.begins_with("uid://") || p_text == "uid://<invalid>") {
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return INVALID_ID;
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}
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uint32_t l = p_text.length();
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uint64_t uid = 0;
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for (uint32_t i = 6; i < l; i++) {
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uid *= base;
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uint32_t c = p_text[i];
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if (is_ascii_lower_case(c)) {
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uid += c - 'a';
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} else if (is_digit(c)) {
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uid += c - '0' + char_count;
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} else {
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return INVALID_ID;
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}
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}
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return ID(uid & 0x7FFFFFFFFFFFFFFF);
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}
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ResourceUID::ID ResourceUID::create_id() {
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while (true) {
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ID id = INVALID_ID;
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MutexLock lock(mutex);
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Error err = ((CryptoCore::RandomGenerator *)crypto)->get_random_bytes((uint8_t *)&id, sizeof(id));
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ERR_FAIL_COND_V(err != OK, INVALID_ID);
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id &= 0x7FFFFFFFFFFFFFFF;
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bool exists = unique_ids.has(id);
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if (!exists) {
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return id;
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}
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}
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}
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bool ResourceUID::has_id(ID p_id) const {
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MutexLock l(mutex);
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return unique_ids.has(p_id);
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}
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void ResourceUID::add_id(ID p_id, const String &p_path) {
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MutexLock l(mutex);
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ERR_FAIL_COND(unique_ids.has(p_id));
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Cache c;
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c.cs = p_path.utf8();
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unique_ids[p_id] = c;
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changed = true;
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}
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void ResourceUID::set_id(ID p_id, const String &p_path) {
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MutexLock l(mutex);
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ERR_FAIL_COND(!unique_ids.has(p_id));
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CharString cs = p_path.utf8();
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const char *update_ptr = cs.ptr();
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const char *cached_ptr = unique_ids[p_id].cs.ptr();
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if (update_ptr == nullptr && cached_ptr == nullptr) {
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return; // Both are empty strings.
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}
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if ((update_ptr == nullptr) != (cached_ptr == nullptr) || strcmp(update_ptr, cached_ptr) != 0) {
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unique_ids[p_id].cs = cs;
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unique_ids[p_id].saved_to_cache = false; //changed
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changed = true;
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}
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}
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String ResourceUID::get_id_path(ID p_id) const {
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MutexLock l(mutex);
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ERR_FAIL_COND_V(!unique_ids.has(p_id), String());
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const CharString &cs = unique_ids[p_id].cs;
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return String::utf8(cs.ptr());
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}
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void ResourceUID::remove_id(ID p_id) {
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MutexLock l(mutex);
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ERR_FAIL_COND(!unique_ids.has(p_id));
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unique_ids.erase(p_id);
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}
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Error ResourceUID::save_to_cache() {
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String cache_file = get_cache_file();
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if (!FileAccess::exists(cache_file)) {
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Ref<DirAccess> d = DirAccess::create(DirAccess::ACCESS_RESOURCES);
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d->make_dir_recursive(String(cache_file).get_base_dir()); //ensure base dir exists
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}
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Ref<FileAccess> f = FileAccess::open(cache_file, FileAccess::WRITE);
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if (f.is_null()) {
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return ERR_CANT_OPEN;
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}
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MutexLock l(mutex);
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f->store_32(unique_ids.size());
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cache_entries = 0;
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for (KeyValue<ID, Cache> &E : unique_ids) {
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f->store_64(E.key);
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uint32_t s = E.value.cs.length();
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f->store_32(s);
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f->store_buffer((const uint8_t *)E.value.cs.ptr(), s);
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E.value.saved_to_cache = true;
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cache_entries++;
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}
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changed = false;
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return OK;
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}
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Error ResourceUID::load_from_cache() {
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Ref<FileAccess> f = FileAccess::open(get_cache_file(), FileAccess::READ);
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if (f.is_null()) {
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return ERR_CANT_OPEN;
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}
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MutexLock l(mutex);
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unique_ids.clear();
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uint32_t entry_count = f->get_32();
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for (uint32_t i = 0; i < entry_count; i++) {
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int64_t id = f->get_64();
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int32_t len = f->get_32();
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Cache c;
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c.cs.resize(len + 1);
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ERR_FAIL_COND_V(c.cs.size() != len + 1, ERR_FILE_CORRUPT); // out of memory
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c.cs[len] = 0;
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int32_t rl = f->get_buffer((uint8_t *)c.cs.ptrw(), len);
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ERR_FAIL_COND_V(rl != len, ERR_FILE_CORRUPT);
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c.saved_to_cache = true;
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unique_ids[id] = c;
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}
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cache_entries = entry_count;
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changed = false;
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return OK;
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}
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Error ResourceUID::update_cache() {
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if (!changed) {
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return OK;
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}
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if (cache_entries == 0) {
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return save_to_cache();
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}
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MutexLock l(mutex);
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Ref<FileAccess> f;
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for (KeyValue<ID, Cache> &E : unique_ids) {
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if (!E.value.saved_to_cache) {
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if (f.is_null()) {
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f = FileAccess::open(get_cache_file(), FileAccess::READ_WRITE); //append
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if (f.is_null()) {
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return ERR_CANT_OPEN;
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}
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f->seek_end();
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}
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f->store_64(E.key);
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uint32_t s = E.value.cs.length();
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f->store_32(s);
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f->store_buffer((const uint8_t *)E.value.cs.ptr(), s);
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E.value.saved_to_cache = true;
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cache_entries++;
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}
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}
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if (f.is_valid()) {
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f->seek(0);
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f->store_32(cache_entries); //update amount of entries
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}
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changed = false;
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return OK;
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}
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void ResourceUID::clear() {
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cache_entries = 0;
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unique_ids.clear();
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changed = false;
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}
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void ResourceUID::_bind_methods() {
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ClassDB::bind_method(D_METHOD("id_to_text", "id"), &ResourceUID::id_to_text);
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ClassDB::bind_method(D_METHOD("text_to_id", "text_id"), &ResourceUID::text_to_id);
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ClassDB::bind_method(D_METHOD("create_id"), &ResourceUID::create_id);
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ClassDB::bind_method(D_METHOD("has_id", "id"), &ResourceUID::has_id);
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ClassDB::bind_method(D_METHOD("add_id", "id", "path"), &ResourceUID::add_id);
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ClassDB::bind_method(D_METHOD("set_id", "id", "path"), &ResourceUID::set_id);
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ClassDB::bind_method(D_METHOD("get_id_path", "id"), &ResourceUID::get_id_path);
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ClassDB::bind_method(D_METHOD("remove_id", "id"), &ResourceUID::remove_id);
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BIND_CONSTANT(INVALID_ID)
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}
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ResourceUID *ResourceUID::singleton = nullptr;
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ResourceUID::ResourceUID() {
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ERR_FAIL_COND(singleton != nullptr);
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singleton = this;
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crypto = memnew(CryptoCore::RandomGenerator);
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((CryptoCore::RandomGenerator *)crypto)->init();
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}
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ResourceUID::~ResourceUID() {
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memdelete((CryptoCore::RandomGenerator *)crypto);
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}
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