mem: implement most of StandardAllocator

This was tested using `https://github.com/node-dot-cpp/alloc-test` plus a few other by-hand tests.

It seems to work for the case we care about (sysmodules without thread cache-ing).

External users are advised to build with assertions on and contact SciresM if you find issues.

This is a lot of code to have gotten right in one go, and it was written mostly after midnight while sick, so there are probably un-noticed issues.

libraries/libvapours/include/vapours/crypto/impl/crypto_sha1_impl.hpp

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * 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/>.
+ */
+
+#pragma once
+#include <vapours/common.hpp>
+#include <vapours/assert.hpp>
+#include <vapours/util.hpp>
+#include <vapours/crypto/impl/crypto_hash_function.hpp>
+#include <vapours/crypto/crypto_memory_clear.hpp>
+
+
+namespace ams::crypto::impl {
+
+    class Sha1Impl {
+        public:
+            static constexpr size_t HashSize  = 0x14;
+            static constexpr size_t BlockSize = 0x40;
+        private:
+            struct State {
+                u32 intermediate_hash[HashSize / sizeof(u32)];
+                u8  buffer[BlockSize];
+                u64 bits_consumed;
+                size_t num_buffered;
+                bool finalized;
+            };
+        private:
+            State state;
+        public:
+            Sha1Impl() { /* ... */ }
+            ~Sha1Impl() {
+                static_assert(std::is_trivially_destructible<State>::value);
+                ClearMemory(std::addressof(this->state), sizeof(this->state));
+            }
+
+            void Initialize();
+            void Update(const void *data, size_t size);
+            void GetHash(void *dst, size_t size);
+    };
+
+    /* static_assert(HashFunction<Sha1Impl>); */
+
+}