forked from lamogui/ogre_blender_importer
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OgreSerializer.py
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OgreSerializer.py
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from enum import Enum;
from io import IOBase;
from io import SEEK_CUR;
from io import SEEK_SET;
from struct import unpack;
import sys;
try:
from OgreStringUtils import OgreStringUtils
except ImportError as e:
directory = os.path.dirname(os.path.realpath(__file__));
print("Import error: " + str(e) + " manual compilation" );
srcfile="OgreStringUtils.py";exec(compile(open(os.path.join(directory,srcfile)).read(), srcfile, 'exec'))
class OgreSerializer:
"""
Generic class for serialising data to / from binary stream-based files.
This class provides a number of useful methods for exporting / importing data
from stream-oriented binary files (e.g. .mesh and .skeleton)
From: OgreMain/include/OgreSerializer.h and OgreMain/src/OgreSerializer.cpp
url: https://bitbucket.org/sinbad/ogre/src/0d580c7216abe27fafe41cb43e31d8ed86ded591/OgreMain/include/OgreSerializer.h
"""
HEADER_STREAM_ID = 0x1000;
BIG_ENDIAN_HEADER_STREAM_ID = 0x0010;
OGRE_STREAM_TEMP_SIZE = 128;
class Endian(Enum):
ENDIAN_NATIVE = sys.byteorder;
ENDIAN_BIG = 'big';
ENDIAN_LITTLE = 'little';
def __init__(self):
self._version = "[Serializer_v1.00]";
self._endianness=OgreSerializer.Endian.ENDIAN_NATIVE;
self._reportChunkError=True;
self._chunkSizeStack=[];
self._currentstreamLen=0;
def _determineEndianness(self,param):
if issubclass(type(param), IOBase):
stream = param;
if (stream.tell() != 0):
raise ValueError("OgreSerializer._determineEndianness(self,stream):"
" Can only determine the endianness of the input "
"stream if it is at the start");
actually_read = stream.read(2);
stream.seek(0,SEEK_SET);
if len(actually_read) != 2:
raise ValueError("OgreSerializer._determineEndianness(self,stream):"
" Couldn't read 16 bit header value from input stream");
dest = unpack("=H",actually_read)[0];
if dest == OgreSerializer.HEADER_STREAM_ID:
self._endianness = OgreSerializer.Endian.ENDIAN_LITTLE;
elif dest == OgreSerializer.BIG_ENDIAN_HEADER_STREAM_ID:
self._endianness = OgreSerializer.Endian.ENDIAN_BIG;
else:
raise ValueError("OgreSerializer._determineEndianness(self,stream): "
"Header chunk didn't match either endian: Corrupted stream?");
elif param == OgreSerializer.Endian.ENDIAN_BIG or param == OgreSerializer.Endian.ENDIAN_LITTLE:
self._endianness = param;
else:
raise ValueError("OgreSerializer._determineEndianness(self,param): "
"Invalid parameter should be an IOBase class or 'little' or 'big'");
def _readBools(self, stream, count):
assert(issubclass(type(stream),IOBase));
assert(type(count) is int and count > 0);
readed = stream.read(count);
if (len(readed) != count):
raise EOFError;
if self._endianness==OgreSerializer.Endian.ENDIAN_LITTLE:
return unpack("<" + ("?"*count), readed);
else:
return unpack(">" + ("?"*count), readed);
def _readFloats(self, stream, count):
assert(issubclass(type(stream),IOBase));
assert(type(count) is int and count > 0);
readed = stream.read(count*4);
if (len(readed) != count*4):
raise EOFError;
if self._endianness==OgreSerializer.Endian.ENDIAN_LITTLE:
return unpack("<" + ("f"*count), readed);
else:
return unpack(">" + ("f"*count), readed);
def _readDoubles(self, stream, count):
assert(issubclass(type(stream),IOBase));
assert(type(count) is int and count > 0);
readed = stream.read(count*8);
if (len(readed) != count*8):
raise EOFError;
if self._endianness==OgreSerializer.Endian.ENDIAN_LITTLE:
return unpack("<" + ("d"*count), readed);
else:
return unpack(">" + ("d"*count), readed);
def _readShorts(self, stream, count):
assert(issubclass(type(stream),IOBase));
assert(type(count) is int and count > 0);
readed = stream.read(count*2);
if (len(readed) != count*2):
raise EOFError;
if self._endianness==OgreSerializer.Endian.ENDIAN_LITTLE:
return unpack("<" + ("h"*count), readed);
else:
return unpack(">" + ("h"*count), readed);
def _readUShorts(self, stream, count):
assert(issubclass(type(stream),IOBase));
assert(type(count) is int and count > 0);
readed = stream.read(count*2);
if (len(readed) != count*2):
raise EOFError;
if self._endianness==OgreSerializer.Endian.ENDIAN_LITTLE:
return unpack("<" + ("H"*count), readed);
else:
return unpack(">" + ("H"*count), readed);
def _readInts(self, stream, count):
assert(issubclass(type(stream),IOBase));
assert(type(count) is int and count > 0);
readed = stream.read(count*4);
if (len(readed) != count*4):
raise EOFError;
if self._endianness==OgreSerializer.Endian.ENDIAN_LITTLE:
return unpack("<" + ("i"*count), readed);
else:
return unpack(">" + ("i"*count), readed);
def _readUInts(self, stream, count):
assert(issubclass(type(stream),IOBase));
assert(type(count) is int and count > 0);
readed = stream.read(count*4);
if (len(readed) != count*4):
raise EOFError;
if self._endianness==OgreSerializer.Endian.ENDIAN_LITTLE:
return unpack("<" + ("I"*count), readed);
else:
return unpack(">" + ("I"*count), readed);
#From Ogre::Serializer::readString
def readString(stream, size=-1):
assert(issubclass(type(stream),IOBase));
assert(type(size) is int);
if (size < 0):
return OgreSerializer.getLine(stream,False);
else:
readChar=None;
retString = "";
for i in range(size):
readChar=stream.read(1)[0];
retString += str(chr(readChar));
return retString;
#From Ogre::DataStream::getLine
def getLine(stream, trimAfter=True):
readChar=None;
retString = "";
stop=False;
while (not stop):
readChar=stream.read(1)[0];
if (chr(readChar)=='\n'):
stop = True;
else:
retString += str(chr(readChar));
if (trimAfter):
retString = OgreStringUtils.trim(retString);
return retString;
def _readFileHeader(self, stream):
assert(issubclass(type(stream),IOBase));
header = self._readUShorts(stream, 1)[0];
if (header == OgreSerializer.HEADER_STREAM_ID):
ver = OgreSerializer.readString(stream);
if (ver != self._version):
raise ValueError("OgreSerializer._readFileHeader: "
"Invalid file version incompatible, file"
" reports " + ver + " Serializer is version "
+ self._version);
else:
raise ValueError("OgreSerializer._readFileHeader: "
"Invalid file no header");
def _readChunk(self, stream):
assert(issubclass(type(stream),IOBase));
pos = stream.tell();
chunkid = self._readUShorts(stream,1)[0];
self._currentstreamLen = self._readUInts(stream,1)[0];
if (self._chunkSizeStack):
if (pos != self._chunkSizeStack[-1] and self._reportChunkError):
print("Corrupted chunk detected ! Chunk ID: " + str(chunkid));
self._chunkSizeStack[-1] = pos + self._currentstreamLen;
return chunkid;
def _readVector3(self,stream):
return self._readFloats(stream,3);
def _readOgreQuaternion(self,stream):
return self._readFloats(stream,4);
def _readBlenderQuaternion(self,stream):
(x,y,z,w) = self._readOgreQuaternion(stream);
return (w,x,y,z);
def _pushInnerChunk(self, stream):
assert(issubclass(type(stream),IOBase));
self._chunkSizeStack.append(stream.tell());
def _calcChunkHeaderSize(self):
return 2 + 4;
def calcStringSize(string):
assert(type(string) is str);
return len(string) + 1;
def _backpedalChunkHeader(self,stream):
assert(issubclass(type(stream),IOBase));
stream.seek(-self._calcChunkHeaderSize(),SEEK_CUR);
self._chunkSizeStack[-1] = stream.tell();
def _popInnerChunk(self, stream):
assert(issubclass(type(stream),IOBase));
if (self._chunkSizeStack):
pos = stream.tell();
if (pos != self._chunkSizeStack[-1] and self._reportChunkError):
print("Corrupted chunk detected !");
self._chunkSizeStack.pop();
def enableValidation(self):
self._reportChunkError = True;
def disableValidation(self):
self._reportChunkError = False;