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#*****************************************************************************
# Copyright 2004-2008 Steve Menard
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
#*****************************************************************************
from . import _jvmfinder
from ._jvmfinder import JVMNotSupportedException
import struct as _struct
import sys as _sys
# ------------------------------------------------------------------------------
def _checkJVMArch(jvmPath):
IMAGE_FILE_MACHINE_I386=332
IMAGE_FILE_MACHINE_IA64=512
IMAGE_FILE_MACHINE_AMD64=34404
is64 = _sys.maxsize > 2**32
with open(jvmPath, "rb") as f:
s=f.read(2)
if s!=b"MZ":
raise JVMNotSupportedException("JVM not valid")
else:
f.seek(60)
s=f.read(4)
header_offset=_struct.unpack("<L", s)[0]
f.seek(header_offset+4)
s=f.read(2)
machine=_struct.unpack("<H", s)[0]
if machine==IMAGE_FILE_MACHINE_I386:
if is64:
raise JVMNotSupportedException("JVM mismatch, python is 64 bit and JVM is 32 bit.")
elif machine==IMAGE_FILE_MACHINE_IA64 or machine==IMAGE_FILE_MACHINE_AMD64:
if not is64:
raise JVMNotSupportedException("JVM mismatch, python is 32 bit and JVM is 64 bit.")
else:
raise JVMNotSupportedException("Unable to deterime JVM Type")
class WindowsJVMFinder(_jvmfinder.JVMFinder):
"""
Windows JVM library finder class
"""
def __init__(self):
"""
Sets up members
"""
# Call the parent constructor
_jvmfinder.JVMFinder.__init__(self)
# Library file name
self._libfile = "jvm.dll"
# Search methods
winreg = self._get_winreg()
if winreg!=None:
self._methods = (self._get_from_java_home, self._get_from_registry)
else:
self._methods = (self._get_from_java_home, )
def check(self, jvm):
_checkJVMArch(jvm)
def _get_winreg(self):
# Py2
try:
import _winreg as winreg
return winreg
except ImportError:
pass
# in Py3, winreg has been moved
try:
import winreg
return winreg
except ImportError:
pass
return None
def _get_from_registry(self):
"""
Retrieves the path to the default Java installation stored in the
Windows registry
:return: The path found in the registry, or None
"""
try:
# Winreg is an optional package in cygwin
winreg = self._get_winreg()
if not winreg:
return None
jreKey = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE,
r"SOFTWARE\JavaSoft\Java Runtime Environment")
cv = winreg.QueryValueEx(jreKey, "CurrentVersion")
versionKey = winreg.OpenKey(jreKey, cv[0])
winreg.CloseKey(jreKey)
cv = winreg.QueryValueEx(versionKey, "RuntimeLib")
winreg.CloseKey(versionKey)
return cv[0]
except WindowsError:
return None
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