internal static byte[] CFGetData(SafeCFDataHandle cfData)
{
bool addedRef = false;
try
{
cfData.DangerousAddRef(ref addedRef);
byte[] bytes = new byte[CFDataGetLength(cfData).ToInt64()];
unsafe
{
byte *dataBytes = CFDataGetBytePtr(cfData);
Marshal.Copy((IntPtr)dataBytes, bytes, 0, bytes.Length);
}
return(bytes);
}
finally
{
if (addedRef)
{
cfData.DangerousRelease();
}
}
}
internal static unsafe bool TryCFWriteData(SafeCFDataHandle cfData, Span <byte> destination, out int bytesWritten)
{
bool addedRef = false;
try
{
cfData.DangerousAddRef(ref addedRef);
long length = CFDataGetLength(cfData).ToInt64();
if (destination.Length < length)
{
bytesWritten = 0;
return(false);
}
byte *dataBytes = CFDataGetBytePtr(cfData);
fixed(byte *destinationPtr = &MemoryMarshal.GetReference(destination))
{
Buffer.MemoryCopy(dataBytes, destinationPtr, destination.Length, length);
}
bytesWritten = (int)length;
return(true);
}
finally
{
if (addedRef)
{
cfData.DangerousRelease();
}
}
}
internal static string CFStringToString(SafeCFStringHandle cfString)
{
Debug.Assert(cfString != null);
Debug.Assert(!cfString.IsInvalid);
Debug.Assert(!cfString.IsClosed);
// If the string is already stored internally as UTF-8 we can (usually)
// get the raw pointer to the data blob, then we can Marshal in the string
// via pointer semantics, avoiding a copy.
IntPtr interiorPointer = CFStringGetCStringPtr(
cfString,
CFStringBuiltInEncodings.kCFStringEncodingUTF8);
if (interiorPointer != IntPtr.Zero)
{
return(Marshal.PtrToStringUTF8(interiorPointer) !);
}
SafeCFDataHandle cfData = CFStringCreateExternalRepresentation(
IntPtr.Zero,
cfString,
CFStringBuiltInEncodings.kCFStringEncodingUTF8,
0);
using (cfData)
{
bool addedRef = false;
try
{
cfData.DangerousAddRef(ref addedRef);
unsafe
{
// Note that CFDataGetLength(cfData).ToInt32() will throw on
// too large of an input. Since a >2GB string is pretty unlikely,
// that's considered a good thing here.
return(Encoding.UTF8.GetString(
CFDataGetBytePtr(cfData),
CFDataGetLength(cfData).ToInt32()));
}
}
finally
{
if (addedRef)
{
cfData.DangerousRelease();
}
}
}
}
internal static string CFStringToString(SafeCFStringHandle cfString)
{
Debug.Assert(cfString != null);
Debug.Assert(!cfString.IsInvalid);
Debug.Assert(!cfString.IsClosed);
#if HAVE_PTRTOSTRINGUTF8
IntPtr interiorPointer = CFStringGetCStringPtr(
cfString,
CFStringBuiltInEncodings.kCFStringEncodingUTF8);
if (interiorPointer != IntPtr.Zero)
{
return(Marshal.PtrToStringUTF8(interiorPointer));
}
#endif
SafeCFDataHandle cfData = CFStringCreateExternalRepresentation(
IntPtr.Zero,
cfString,
CFStringBuiltInEncodings.kCFStringEncodingUTF8,
0);
using (cfData)
{
bool addedRef = false;
try
{
cfData.DangerousAddRef(ref addedRef);
unsafe
{
// Note that CFDataGetLength(cfData).ToInt32() will throw on
// too large of an input. Since a >2GB string is pretty unlikely,
// that's considered a good thing here.
return(Encoding.UTF8.GetString(
CFDataGetBytePtr(cfData),
CFDataGetLength(cfData).ToInt32()));
}
}
finally
{
if (addedRef)
{
cfData.DangerousRelease();
}
}
}
}
internal static byte[] CFGetData(SafeCFDataHandle cfData)
{
bool addedRef = false;
try
{
cfData.DangerousAddRef(ref addedRef);
return(CFDataDangerousGetSpan(cfData).ToArray());
}
finally
{
if (addedRef)
{
cfData.DangerousRelease();
}
}
}