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#!/bin/env python
##
## Copyright (c) 2010-2017 Intel Corporation
##
## 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.
##
import os
import struct
class StatsConsFile:
def __init__(self, file_name, tsc = None):
self._file = open(file_name, "rb");
try:
data = self._file.read(4*8);
dataUnpacked = struct.unpack("<qqqq", data);
self._hz = dataUnpacked[0]
if (tsc is None):
self._tsc = dataUnpacked[1]
else:
self._tsc = tsc;
self._entryCount = dataUnpacked[2]
fieldCount = dataUnpacked[3]
data = self._file.read(fieldCount);
fmt = "b" * fieldCount;
dataUnpacked = struct.unpack("<" + fmt, data);
self._entryFmt = "<";
self._entrySize = 0;
for e in dataUnpacked:
if (e == 4):
self._entryFmt += "i"
elif (e == 8):
self._entryFmt += "q"
else:
raise Exception("Unknown field format: " + str(e))
self._entrySize += e
except:
print "except"
self._file.close();
def setBeg(self, tsc):
self._tsc = tsc
def getBeg(self):
return self._tsc;
def getHz(self):
return self._hz
def readNext(self):
ret = []
for i in range(self._entryCount):
entry = self._readNextEntry()
if (entry == None):
return None;
ret.append(entry);
return ret;
def _readNextEntry(self):
try:
entry = self._file.read(self._entrySize);
entryUnpacked = struct.unpack(self._entryFmt, entry);
return list(entryUnpacked)
except:
return None;
def close(self):
self._file.close();
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