private static int WriteUtf16CodePoint(
char *begin, char *end,
byte *dest)
{
return(UnicodeConverter.WriteUtf8CodePoint(
UnicodeConverter.ReadUtf16CodePoint(ref begin, end),
dest));
}
/// <summary>
/// Allocates an unmanaged buffer and fills it with this string's contents,
/// re-encoded as UTF-8. The resulting buffer is terminated by the null
/// terminator character. The caller is responsible for freeing the buffer
/// when it's done using it.
/// </summary>
/// <param name="str">The string to convert to a C-style string.</param>
/// <returns>A C-style string for which the caller is responsible.</returns>
internal static unsafe byte *ToCString(string str)
{
char *beginPtr = str.DataPointer;
char *endPtr = beginPtr + str.Length;
var utf8Length = UnicodeConverter.GetUtf16ToUtf8BufferLength(beginPtr, endPtr);
byte *cStr = (byte *)Marshal.AllocHGlobal(utf8Length + 1);
int offset = 0;
while (beginPtr != endPtr)
{
offset += UnicodeConverter.WriteUtf8CodePoint(
UnicodeConverter.ReadUtf16CodePoint(ref beginPtr, endPtr),
&cStr[offset]);
}
cStr[offset] = (byte)'\0';
return(cStr);
}