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namespace Ryujinx.Memory.Range
{
/// <summary>
/// Range of memory composed of an address and size.
/// </summary>
public readonly record struct MemoryRange
{
/// <summary>
/// Special address value used to indicate than an address is invalid.
/// </summary>
internal const ulong InvalidAddress = ulong.MaxValue;
/// <summary>
/// An empty memory range, with a null address and zero size.
/// </summary>
public static MemoryRange Empty => new(0UL, 0);
/// <summary>
/// Start address of the range.
/// </summary>
public ulong Address { get; }
/// <summary>
/// Size of the range in bytes.
/// </summary>
public ulong Size { get; }
/// <summary>
/// Address where the range ends (exclusive).
/// </summary>
public ulong EndAddress => Address + Size;
/// <summary>
/// Creates a new memory range with the specified address and size.
/// </summary>
/// <param name="address">Start address</param>
/// <param name="size">Size in bytes</param>
public MemoryRange(ulong address, ulong size)
{
Address = address;
Size = size;
}
/// <summary>
/// Checks if the range overlaps with another.
/// </summary>
/// <param name="other">The other range to check for overlap</param>
/// <returns>True if the ranges overlap, false otherwise</returns>
public bool OverlapsWith(MemoryRange other)
{
ulong thisAddress = Address;
ulong thisEndAddress = EndAddress;
ulong otherAddress = other.Address;
ulong otherEndAddress = other.EndAddress;
// If any of the ranges if invalid (address + size overflows),
// then they are never considered to overlap.
if (thisEndAddress < thisAddress || otherEndAddress < otherAddress)
{
return false;
}
return thisAddress < otherEndAddress && otherAddress < thisEndAddress;
}
/// <summary>
/// Checks if a given sub-range of memory is invalid.
/// Those are used to represent unmapped memory regions (holes in the region mapping).
/// </summary>
/// <param name="subRange">Memory range to check</param>
/// <returns>True if the memory range is considered invalid, false otherwise</returns>
internal static bool IsInvalid(ref MemoryRange subRange)
{
return subRange.Address == InvalidAddress;
}
/// <summary>
/// Returns a string summary of the memory range.
/// </summary>
/// <returns>A string summary of the memory range</returns>
public override string ToString()
{
if (Address == InvalidAddress)
{
return $"[Unmapped 0x{Size:X}]";
}
return $"[0x{Address:X}, 0x{EndAddress:X})";
}
}
}
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