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using System;
using System.Collections;
using System.Collections.Generic;
namespace Ryujinx.Memory.Range
{
/// <summary>
/// Sorted list of ranges that supports binary search.
/// </summary>
/// <typeparam name="T">Type of the range.</typeparam>
public class MultiRangeList<T> : IEnumerable<T> where T : IMultiRangeItem
{
private const int ArrayGrowthSize = 32;
private readonly List<T> _items;
public int Count => _items.Count;
/// <summary>
/// Creates a new range list.
/// </summary>
public MultiRangeList()
{
_items = new List<T>();
}
/// <summary>
/// Adds a new item to the list.
/// </summary>
/// <param name="item">The item to be added</param>
public void Add(T item)
{
int index = BinarySearch(item.BaseAddress);
if (index < 0)
{
index = ~index;
}
_items.Insert(index, item);
}
/// <summary>
/// Removes an item from the list.
/// </summary>
/// <param name="item">The item to be removed</param>
/// <returns>True if the item was removed, or false if it was not found</returns>
public bool Remove(T item)
{
int index = BinarySearch(item.BaseAddress);
if (index >= 0)
{
while (index > 0 && _items[index - 1].BaseAddress == item.BaseAddress)
{
index--;
}
while (index < _items.Count)
{
if (_items[index].Equals(item))
{
_items.RemoveAt(index);
return true;
}
if (_items[index].BaseAddress > item.BaseAddress)
{
break;
}
index++;
}
}
return false;
}
/// <summary>
/// Gets all items on the list overlapping the specified memory range.
/// </summary>
/// <param name="address">Start address of the range</param>
/// <param name="size">Size in bytes of the range</param>
/// <param name="output">Output array where matches will be written. It is automatically resized to fit the results</param>
/// <returns>The number of overlapping items found</returns>
public int FindOverlaps(ulong address, ulong size, ref T[] output)
{
return FindOverlaps(new MultiRange(address, size), ref output);
}
/// <summary>
/// Gets all items on the list overlapping the specified memory ranges.
/// </summary>
/// <param name="range">Ranges of memory being searched</param>
/// <param name="output">Output array where matches will be written. It is automatically resized to fit the results</param>
/// <returns>The number of overlapping items found</returns>
public int FindOverlaps(MultiRange range, ref T[] output)
{
int outputIndex = 0;
foreach (T item in _items)
{
if (item.Range.OverlapsWith(range))
{
if (outputIndex == output.Length)
{
Array.Resize(ref output, outputIndex + ArrayGrowthSize);
}
output[outputIndex++] = item;
}
}
return outputIndex;
}
/// <summary>
/// Gets all items on the list starting at the specified memory address.
/// </summary>
/// <param name="baseAddress">Base address to find</param>
/// <param name="output">Output array where matches will be written. It is automatically resized to fit the results</param>
/// <returns>The number of matches found</returns>
public int FindOverlaps(ulong baseAddress, ref T[] output)
{
int index = BinarySearch(baseAddress);
int outputIndex = 0;
if (index >= 0)
{
while (index > 0 && _items[index - 1].BaseAddress == baseAddress)
{
index--;
}
while (index < _items.Count)
{
T overlap = _items[index++];
if (overlap.BaseAddress != baseAddress)
{
break;
}
if (outputIndex == output.Length)
{
Array.Resize(ref output, outputIndex + ArrayGrowthSize);
}
output[outputIndex++] = overlap;
}
}
return outputIndex;
}
/// <summary>
/// Performs binary search on the internal list of items.
/// </summary>
/// <param name="address">Address to find</param>
/// <returns>List index of the item, or complement index of nearest item with lower value on the list</returns>
private int BinarySearch(ulong address)
{
int left = 0;
int right = _items.Count - 1;
while (left <= right)
{
int range = right - left;
int middle = left + (range >> 1);
T item = _items[middle];
if (item.BaseAddress == address)
{
return middle;
}
if (address < item.BaseAddress)
{
right = middle - 1;
}
else
{
left = middle + 1;
}
}
return ~left;
}
public IEnumerator<T> GetEnumerator()
{
return _items.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return _items.GetEnumerator();
}
}
}
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