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namespace HandBrake.Interop
{
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
/// <summary>
/// Helper utilities for native interop.
/// </summary>
public static class InteropUtilities
{
/// <summary>
/// Reads the given native structure pointer.
/// </summary>
/// <typeparam name="T">The type to convert the structure to.</typeparam>
/// <param name="structPtr">The pointer to the native structure.</param>
/// <returns>The converted structure.</returns>
public static T ReadStructure<T>(IntPtr structPtr)
{
return (T)Marshal.PtrToStructure(structPtr, typeof(T));
}
/// <summary>
/// Converts the given native HandBrake list to a managed list.
/// </summary>
/// <typeparam name="T">The type of structure in the list.</typeparam>
/// <param name="listPtr">The pointer to the native list.</param>
/// <returns>The converted managed list.</returns>
public static List<T> ConvertList<T>(IntPtr listPtr)
{
List<T> returnList = new List<T>();
hb_list_s itemList = ReadStructure<hb_list_s>(listPtr);
for (int i = 0; i < itemList.items_count; i++)
{
IntPtr itemPtr = Marshal.ReadIntPtr(itemList.items, i * Marshal.SizeOf(typeof(IntPtr)));
returnList.Add(ReadStructure<T>(itemPtr));
}
return returnList;
}
/// <summary>
/// Creats a new, empty native HandBrake list.
/// </summary>
/// <returns>The new native list.</returns>
public static NativeList CreateNativeList(int capacity)
{
NativeList returnList = new NativeList();
int intSize = Marshal.SizeOf(typeof(IntPtr));
IntPtr nativeListInternal = Marshal.AllocHGlobal(capacity * intSize);
returnList.AllocatedMemory.Add(nativeListInternal);
hb_list_s nativeListStruct = new hb_list_s();
nativeListStruct.items = nativeListInternal;
nativeListStruct.items_alloc = capacity;
nativeListStruct.items_count = 0;
IntPtr nativeListStructPtr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(hb_list_s)));
Marshal.StructureToPtr(nativeListStruct, nativeListStructPtr, false);
returnList.ListPtr = nativeListStructPtr;
return returnList;
}
/// <summary>
/// Creates a native HandBrake list from the given managed list of pointers.
/// </summary>
/// <param name="list">The managed list to convert.</param>
/// <returns>The converted native list.</returns>
public static NativeList CreateIntPtrList(List<IntPtr> list)
{
NativeList returnList = new NativeList();
int intSize = Marshal.SizeOf(typeof(IntPtr));
IntPtr nativeListInternal = Marshal.AllocHGlobal(list.Count * intSize);
returnList.AllocatedMemory.Add(nativeListInternal);
for (int i = 0; i < list.Count; i++)
{
Marshal.WriteIntPtr(nativeListInternal, i * intSize, list[i]);
}
hb_list_s nativeListStruct = new hb_list_s();
nativeListStruct.items = nativeListInternal;
nativeListStruct.items_alloc = list.Count;
nativeListStruct.items_count = list.Count;
IntPtr nativeListStructPtr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(hb_list_s)));
Marshal.StructureToPtr(nativeListStruct, nativeListStructPtr, false);
returnList.ListPtr = nativeListStructPtr;
return returnList;
}
/// <summary>
/// Creates a native HandBrake list from the given managed list of structures.
/// </summary>
/// <typeparam name="T">The type of structures in the list.</typeparam>
/// <param name="list">The managed list to convert.</param>
/// <returns>The converted native list.</returns>
public static NativeList ConvertListBack<T>(List<T> list)
{
NativeList returnList = new NativeList();
int intSize = Marshal.SizeOf(typeof(IntPtr));
IntPtr nativeListInternal = Marshal.AllocHGlobal(list.Count * intSize);
returnList.AllocatedMemory.Add(nativeListInternal);
for (int i = 0; i < list.Count; i++)
{
IntPtr itemPtr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(T)));
returnList.AllocatedMemory.Add(itemPtr);
Marshal.StructureToPtr(list[i], itemPtr, false);
Marshal.WriteIntPtr(nativeListInternal, i * intSize, itemPtr);
}
hb_list_s nativeListStruct = new hb_list_s();
nativeListStruct.items = nativeListInternal;
nativeListStruct.items_alloc = list.Count;
nativeListStruct.items_count = list.Count;
IntPtr nativeListStructPtr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(hb_list_s)));
Marshal.StructureToPtr(nativeListStruct, nativeListStructPtr, false);
returnList.ListPtr = nativeListStructPtr;
return returnList;
}
/// <summary>
/// Frees all the memory locations in the given list.
/// </summary>
/// <param name="memoryList">The list of memory locations to free.</param>
public static void FreeMemory(List<IntPtr> memoryList)
{
foreach (IntPtr memoryLocation in memoryList)
{
Marshal.FreeHGlobal(memoryLocation);
}
}
}
}
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