Move C/C++ sources to src subdirectory

2021-02-25 23:59:03 +03:00
parent 08aed962de
commit bf9a175efc
87 changed files with 194 additions and 189 deletions
@@ -0,0 +1,130 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+
+#include <stdexcept>
+#include "allocator.h"
+
+#include <stdlib.h>
+#include <malloc.h>
+
+allocator::allocator(uint64_t blocks)
+{
+    if (blocks >= 0x80000000 || blocks <= 1)
+    {
+        throw std::invalid_argument("blocks");
+    }
+    uint64_t p2 = 1, total = 1;
+    while (p2 * 64 < blocks)
+    {
+        p2 = p2 * 64;
+        total += p2;
+    }
+    total -= p2;
+    total += (blocks+63) / 64;
+    mask = new uint64_t[2 + total];
+    size = free = blocks;
+    last_one_mask = (blocks % 64) == 0
+        ? UINT64_MAX
+        : ~(UINT64_MAX << (64 - blocks % 64));
+    for (uint64_t i = 0; i < total; i++)
+    {
+        mask[i] = 0;
+    }
+}
+
+allocator::~allocator()
+{
+    delete[] mask;
+}
+
+void allocator::set(uint64_t addr, bool value)
+{
+    if (addr >= size)
+    {
+        return;
+    }
+    uint64_t p2 = 1, offset = 0;
+    while (p2 * 64 < size)
+    {
+        offset += p2;
+        p2 = p2 * 64;
+    }
+    uint64_t cur_addr = addr;
+    bool is_last = true;
+    uint64_t value64 = value ? 1 : 0;
+    while (1)
+    {
+        uint64_t last = offset + cur_addr/64;
+        uint64_t bit = cur_addr % 64;
+        if (((mask[last] >> bit) & 1) != value64)
+        {
+            if (is_last)
+            {
+                free += value ? -1 : 1;
+            }
+            if (value)
+            {
+                mask[last] = mask[last] | (1l << bit);
+                if (mask[last] != (!is_last || cur_addr/64 < size/64
+                    ? UINT64_MAX : last_one_mask))
+                {
+                    break;
+                }
+            }
+            else
+            {
+                mask[last] = mask[last] & ~(1l << bit);
+            }
+            is_last = false;
+            if (p2 > 1)
+            {
+                p2 = p2 / 64;
+                offset -= p2;
+                cur_addr /= 64;
+            }
+            else
+            {
+                break;
+            }
+        }
+        else
+        {
+            break;
+        }
+    }
+}
+
+uint64_t allocator::find_free()
+{
+    uint64_t p2 = 1, offset = 0, addr = 0, f, i;
+    while (p2 < size)
+    {
+        uint64_t m = mask[offset + addr];
+        for (i = 0, f = 1; i < 64; i++, f <<= 1)
+        {
+            if (!(m & f))
+            {
+                break;
+            }
+        }
+        if (i == 64)
+        {
+            // No space
+            return UINT64_MAX;
+        }
+        addr = (addr * 64) | i;
+        if (addr >= size)
+        {
+            // No space
+            return UINT64_MAX;
+        }
+        offset += p2;
+        p2 = p2 * 64;
+    }
+    return addr;
+}
+
+uint64_t allocator::get_free_count()
+{
+    return free;
+}