feat: finish c sharp custom marshaler.
- Finish BMapStringArrayMarshaler but not test.
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@ -27,81 +27,122 @@ namespace BMapSharp {
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return g_Instance;
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}
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public IntPtr MarshalManagedToNative(object ManagedObj) {
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if (ManagedObj is null) return IntPtr.Zero;
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// For respecting the standard of BMap,
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// the native memory we created is a simple array and each item is a pointer to a NULL-terminated UTF8 string.
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// Please note the array self is not NULL-terminated because its length is provided by another argument in function calling.
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// However, this memory layout is not good for our marshaling.
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// We can not know the size of array we created. Because we need iterate it when freeing or fetching data.
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// We also can not know the size of string we created because we need read them when parsing them to C# string.
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//
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// So the solution we made is adding an uint32_t header before the array to indicate the size of array.
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// And also add an uint32_t header for each string to indicate the length of string (in bytes, NULL exclusive).
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// So the pointer put in array is not the address we allocated, it has an offset.
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// Also we return native pointer is not the address we allocated, it also has an offset.
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private static readonly int szLengthHeaderSize = Marshal.SizeOf<int>();
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private static readonly int szArrayItemSize = Marshal.SizeOf<IntPtr>();
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private static readonly int szStringItemSize = Marshal.SizeOf<byte>();
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public IntPtr MarshalManagedToNative(object ManagedObj) {
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// Check nullptr object.
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if (ManagedObj is null) return IntPtr.Zero;
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// Check argument type.
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string[] castManagedObj = ManagedObj as string[];
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if (castManagedObj is null)
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throw new MarshalDirectiveException("BMStringArrayMashaler must be used on an string array.");
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// Allocate array pointer first.
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// We need allocated memory with extra item and set it to zero later.
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// Because we don't have any idea to check the length of this array when free it.
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// Although native BMap library do not need this extra NULL terminal.
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int szArrayItemSize = Marshal.SizeOf<IntPtr>();
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IntPtr pArray = Marshal.AllocHGlobal(szArrayItemSize * (castManagedObj.Length + 1));
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// The allocate string data one by one.
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for (int i = 0; i < castManagedObj.Length; ++i) {
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// Allocate string items first
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int szArrayItemCount = castManagedObj.Length;
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IntPtr[] apStrings = new IntPtr[szArrayItemCount];
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for (int i = 0; i < szArrayItemCount; ++i) {
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// Encode string first.
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byte[] encString = Encoding.UTF8.GetBytes(castManagedObj[i]);
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// Allocate string memory with extra NULL terminal.
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int szStringItemSize = Marshal.SizeOf<byte>();
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IntPtr pString = Marshal.AllocHGlobal(szStringItemSize * (encString.Length + 1));
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// Copy data into it.
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Marshal.Copy(encString, 0, pString, szStringItemSize * encString.Length);
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int szStringItemCount = encString.Length;
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IntPtr pString = Marshal.AllocHGlobal(szStringItemSize * (szStringItemCount + 1) + szLengthHeaderSize);
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// Setup length field
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Marshal.WriteInt32(pString, 0, szStringItemCount);
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// Copy string data with offset.
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IntPtr pFakeString = pString + szLengthHeaderSize;
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Marshal.Copy(encString, 0, pFakeString, szStringItemCount);
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// Set NULL terminal.
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Marshal.WriteByte(pString, szStringItemSize * encString.Length, 0);
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// Add into pointer array
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Marshal.WriteIntPtr(pArray, szArrayItemSize * i, pString);
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Marshal.WriteByte(pFakeString, szStringItemSize * szStringItemCount, 0);
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// Set item in string pointer
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apStrings[i] = pFakeString;
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}
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// Write array NULL terminal
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Marshal.WriteIntPtr(pArray, szArrayItemSize * castManagedObj.Length, IntPtr.Zero);
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// Allocate array pointer now.
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IntPtr pArray = Marshal.AllocHGlobal(szArrayItemSize * szArrayItemCount + szLengthHeaderSize);
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// Setup length field
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Marshal.WriteInt32(pArray, 0, szArrayItemCount);
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// Copy string pointer data with offset.
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IntPtr pFakeArray = pArray + szLengthHeaderSize;
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Marshal.Copy(apStrings, 0, pFakeArray, szArrayItemCount);
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// Return value
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return pArray;
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return pFakeArray;
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}
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public object MarshalNativeToManaged(IntPtr pNativeData) {
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// Check nullptr
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if (pNativeData == IntPtr.Zero) return null;
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// Iterate the array until we reach the NULL terminal.
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// And save all we meet string.
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int szArrayItemSize = Marshal.SizeOf<IntPtr>();
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IntPtr pArray = pNativeData;
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int index = 0;
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while (true) {
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// Get the pointer of this string.
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IntPtr pString = Marshal.ReadIntPtr(pArray, szArrayItemSize * index);
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// If it is NULL terminal, break the while.
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if (pString == IntPtr.Zero) break;
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// Get real array pointer
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IntPtr pFakeArray = pNativeData;
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IntPtr pArray = pFakeArray - szLengthHeaderSize;
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// Read string into buffer and
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Marshal.FreeHGlobal(pString);
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++index;
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// Get the count of array and read string pointers
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int szArrayItemCount = Marshal.ReadInt32(pArray, 0);
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IntPtr[] apStrings = new IntPtr[szArrayItemCount];
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Marshal.Copy(pFakeArray, apStrings, 0, szArrayItemCount);
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// Iterate the array and process each string one by one.
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string[] ret = new string[szArrayItemCount];
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for (int i = 0; i < szArrayItemCount; ++i) {
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// Get string pointer
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IntPtr pFakeString = apStrings[i];
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if (pFakeString == IntPtr.Zero) {
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ret[i] = null;
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continue;
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}
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IntPtr pString = pFakeString - szLengthHeaderSize;
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// Read string length
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int szStringItemCount = Marshal.ReadInt32(pString, 0);
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// Read string body
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byte[] encString = new byte[szStringItemCount];
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Marshal.Copy(pFakeString, encString, 0, szStringItemCount);
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// Decode string with UTF8
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ret[i] = Encoding.UTF8.GetString(encString);
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}
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// Return result
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return ret;
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}
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public void CleanUpNativeData(IntPtr pNativeData) {
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// Check nullptr
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if (pNativeData == IntPtr.Zero) return;
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// Iterate the array until we reach the NULL terminal.
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// And free every string we meet.
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int szArrayItemSize = Marshal.SizeOf<IntPtr>();
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IntPtr pArray = pNativeData;
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int index = 0;
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while (true) {
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// Get the pointer of this string.
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IntPtr pString = Marshal.ReadIntPtr(pArray, szArrayItemSize * index);
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// If it is NULL terminal, break the while.
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if (pString == IntPtr.Zero) break;
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// Free string and move index to next one.
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// Get real array pointer
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IntPtr pFakeArray = pNativeData;
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IntPtr pArray = pFakeArray - szLengthHeaderSize;
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// Get the count of array and read string pointers
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int szArrayItemCount = Marshal.ReadInt32(pArray, 0);
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IntPtr[] apStrings = new IntPtr[szArrayItemCount];
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Marshal.Copy(pFakeArray, apStrings, 0, szArrayItemCount);
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// Iterate the array and free them one by one.
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for (int i = 0; i < szArrayItemCount; ++i) {
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// Get string pointer
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IntPtr pFakeString = apStrings[i];
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if (pFakeString == IntPtr.Zero) continue;
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IntPtr pString = pFakeString - szLengthHeaderSize;
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// Free string pointer
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Marshal.FreeHGlobal(pString);
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++index;
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}
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// Now free the array self.
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// Free array self
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Marshal.FreeHGlobal(pArray);
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}
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@ -85,6 +85,7 @@ namespace BMapSharp.VirtoolsTypes {
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public VxVector4 w;
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}
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[StructLayout(LayoutKind.Sequential, Pack = 4, CharSet = CharSet.Ansi)]
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public struct CKFaceIndices {
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[MarshalAs(UnmanagedType.U4)]
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public uint I1;
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