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pythonnet/src/runtime/CustomMarshaler.cs at master · sdpython/pythonnet · GitHub
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runtime
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CustomMarshaler.cs
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using
System
;
using
System
.
Linq
;
using
System
.
Runtime
.
InteropServices
;
using
System
.
Text
;
namespace
Python
.
Runtime
{
/// <summary>
/// Abstract class defining boiler plate methods that
/// Custom Marshalers will use.
/// </summary>
internal
abstract
class
MarshalerBase
:
ICustomMarshaler
{
public
object
MarshalNativeToManaged
(
IntPtr
pNativeData
)
{
throw
new
NotImplementedException
(
)
;
}
public
abstract
IntPtr
MarshalManagedToNative
(
object
managedObj
)
;
public
void
CleanUpNativeData
(
IntPtr
pNativeData
)
{
Marshal
.
FreeHGlobal
(
pNativeData
)
;
}
public
void
CleanUpManagedData
(
object
managedObj
)
{
// Let GC deal with it
}
public
int
GetNativeDataSize
(
)
{
return
IntPtr
.
Size
;
}
}
/// <summary>
/// Custom Marshaler to deal with Managed String to Native
/// conversion differences on UCS2/UCS4.
/// </summary>
internal
class
UcsMarshaler
:
MarshalerBase
{
private
static
readonly
MarshalerBase
Instance
=
new
UcsMarshaler
(
)
;
private
static
readonly
Encoding
PyEncoding
=
Runtime
.
PyEncoding
;
public
override
IntPtr
MarshalManagedToNative
(
object
managedObj
)
{
var
s
=
managedObj
as
string
;
if
(
s
==
null
)
{
return
IntPtr
.
Zero
;
}
byte
[
]
bStr
=
PyEncoding
.
GetBytes
(
s
+
"
\0
"
)
;
IntPtr
mem
=
Marshal
.
AllocHGlobal
(
bStr
.
Length
)
;
try
{
Marshal
.
Copy
(
bStr
,
0
,
mem
,
bStr
.
Length
)
;
}
catch
(
Exception
)
{
Marshal
.
FreeHGlobal
(
mem
)
;
throw
;
}
return
mem
;
}
public
static
ICustomMarshaler
GetInstance
(
string
cookie
)
{
return
Instance
;
}
public
static
string
PtrToStringUni
(
IntPtr
p
)
{
if
(
p
==
IntPtr
.
Zero
)
{
return
null
;
}
int
size
=
GetUnicodeByteLength
(
p
)
;
var
buffer
=
new
byte
[
size
]
;
Marshal
.
Copy
(
p
,
buffer
,
0
,
size
)
;
return
PyEncoding
.
GetString
(
buffer
,
0
,
size
)
;
}
public
static
int
GetUnicodeByteLength
(
IntPtr
p
)
{
var
len
=
0
;
while
(
true
)
{
int
c
=
Runtime
.
_UCS
==
2
?
Marshal
.
ReadInt16
(
p
,
len
*
2
)
:
Marshal
.
ReadInt32
(
p
,
len
*
4
)
;
if
(
c
==
0
)
{
return
len
*
Runtime
.
_UCS
;
}
checked
{
++
len
;
}
}
}
/// <summary>
/// Utility function for Marshaling Unicode on PY3 and AnsiStr on PY2.
/// Use on functions whose Input signatures changed between PY2/PY3.
/// Ex. Py_SetPythonHome
/// </summary>
/// <param name="s">Managed String</param>
/// <returns>
/// Ptr to Native String ANSI(PY2)/Unicode(PY3/UCS2)/UTF32(PY3/UCS4.
/// </returns>
/// <remarks>
/// You MUST deallocate the IntPtr of the Return when done with it.
/// </remarks>
public
static
IntPtr
Py3UnicodePy2StringtoPtr
(
string
s
)
{
return
Instance
.
MarshalManagedToNative
(
s
)
;
}
/// <summary>
/// Utility function for Marshaling Unicode IntPtr on PY3 and
/// AnsiStr IntPtr on PY2 to Managed Strings. Use on Python functions
/// whose return type changed between PY2/PY3.
/// Ex. Py_GetPythonHome
/// </summary>
/// <param name="p">Native Ansi/Unicode/UTF32 String</param>
/// <returns>
/// Managed String
/// </returns>
public
static
string
PtrToPy3UnicodePy2String
(
IntPtr
p
)
{
return
PtrToStringUni
(
p
)
;
}
}
/// <summary>
/// Custom Marshaler to deal with Managed String Arrays to Native
/// conversion differences on UCS2/UCS4.
/// </summary>
internal
class
StrArrayMarshaler
:
MarshalerBase
{
private
static
readonly
MarshalerBase
Instance
=
new
StrArrayMarshaler
(
)
;
private
static
readonly
Encoding
PyEncoding
=
Runtime
.
PyEncoding
;
public
override
IntPtr
MarshalManagedToNative
(
object
managedObj
)
{
var
argv
=
managedObj
as
string
[
]
;
if
(
argv
==
null
)
{
return
IntPtr
.
Zero
;
}
int
totalStrLength
=
argv
.
Sum
(
arg
=>
arg
.
Length
+
1
)
;
int
memSize
=
argv
.
Length
*
IntPtr
.
Size
+
totalStrLength
*
Runtime
.
_UCS
;
IntPtr
mem
=
Marshal
.
AllocHGlobal
(
memSize
)
;
try
{
// Preparing array of pointers to strings
IntPtr
curStrPtr
=
mem
+
argv
.
Length
*
IntPtr
.
Size
;
for
(
var
i
=
0
;
i
<
argv
.
Length
;
i
++
)
{
byte
[
]
bStr
=
PyEncoding
.
GetBytes
(
argv
[
i
]
+
"
\0
"
)
;
Marshal
.
Copy
(
bStr
,
0
,
curStrPtr
,
bStr
.
Length
)
;
Marshal
.
WriteIntPtr
(
mem
+
i
*
IntPtr
.
Size
,
curStrPtr
)
;
curStrPtr
+=
bStr
.
Length
;
}
}
catch
(
Exception
)
{
Marshal
.
FreeHGlobal
(
mem
)
;
throw
;
}
return
mem
;
}
public
static
ICustomMarshaler
GetInstance
(
string
cookie
)
{
return
Instance
;
}
}
/// <summary>
/// Custom Marshaler to deal with Managed String to Native
/// conversion on UTF-8. Use on functions that expect UTF-8 encoded
/// strings like `PyUnicode_FromStringAndSize`
/// </summary>
/// <remarks>
/// If instead we used `MarshalAs(UnmanagedType.LPWStr)` the output to
/// `foo` would be `f\x00o\x00o\x00`.
/// </remarks>
internal
class
Utf8Marshaler
:
MarshalerBase
{
private
static
readonly
MarshalerBase
Instance
=
new
Utf8Marshaler
(
)
;
private
static
readonly
Encoding
PyEncoding
=
Encoding
.
UTF8
;
public
override
IntPtr
MarshalManagedToNative
(
object
managedObj
)
{
var
s
=
managedObj
as
string
;
if
(
s
==
null
)
{
return
IntPtr
.
Zero
;
}
byte
[
]
bStr
=
PyEncoding
.
GetBytes
(
s
+
"
\0
"
)
;
IntPtr
mem
=
Marshal
.
AllocHGlobal
(
bStr
.
Length
)
;
try
{
Marshal
.
Copy
(
bStr
,
0
,
mem
,
bStr
.
Length
)
;
}
catch
(
Exception
)
{
Marshal
.
FreeHGlobal
(
mem
)
;
throw
;
}
return
mem
;
}
public
static
ICustomMarshaler
GetInstance
(
string
cookie
)
{
return
Instance
;
}
}
}
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