2 3# Copyright (c) 2013 ARM Limited 4# All rights reserved 5# 6# The license below extends only to copyright in the software and shall 7# not be construed as granting a license to any other intellectual 8# property including but not limited to intellectual property relating 9# to a hardware implementation of the functionality of the software 10# licensed hereunder. You may use the software subject to the license 11# terms below provided that you ensure that this notice is replicated 12# unmodified and in its entirety in all distributions of the software, 13# modified or unmodified, in source code or in binary form. 14# 15# Redistribution and use in source and binary forms, with or without 16# modification, are permitted provided that the following conditions are 17# met: redistributions of source code must retain the above copyright 18# notice, this list of conditions and the following disclaimer; 19# redistributions in binary form must reproduce the above copyright 20# notice, this list of conditions and the following disclaimer in the 21# documentation and/or other materials provided with the distribution; 22# neither the name of the copyright holders nor the names of its 23# contributors may be used to endorse or promote products derived from 24# this software without specific prior written permission. 25# 26# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 27# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 28# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 29# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 30# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 31# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 32# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 33# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 34# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 35# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 36# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 37# 38# Copyright 2008 Google Inc. All rights reserved. 39# http://code.google.com/p/protobuf/ 40# 41# Redistribution and use in source and binary forms, with or without 42# modification, are permitted provided that the following conditions are 43# met: 44# 45# * Redistributions of source code must retain the above copyright 46# notice, this list of conditions and the following disclaimer. 47# * Redistributions in binary form must reproduce the above 48# copyright notice, this list of conditions and the following disclaimer 49# in the documentation and/or other materials provided with the 50# distribution. 51# * Neither the name of Google Inc. nor the names of its 52# contributors may be used to endorse or promote products derived from 53# this software without specific prior written permission. 54# 55# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 56# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 57# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 58# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 59# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 60# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 61# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 62# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 63# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 64# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 65# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 66# 67# Authors: Andreas Hansson 68# Radhika Jagtap 69 70# This file is a library of commonly used functions used when interfacing 71# with protobuf python messages. For eg, the decode scripts for different 72# types of proto objects can use the same function to decode a single message 73 74import gzip 75import struct 76 77def openFileRd(in_file): 78 """ 79 This opens the file passed as argument for reading using an appropriate 80 function depending on if it is gzipped or not. It returns the file 81 handle. 82 """ 83 try: 84 # First see if this file is gzipped 85 try: 86 # Opening the file works even if it is not a gzip file 87 proto_in = gzip.open(in_file, 'rb') 88 89 # Force a check of the magic number by seeking in the 90 # file. If we do not do it here the error will occur when 91 # reading the first message. 92 proto_in.seek(1) 93 proto_in.seek(0) 94 except IOError: 95 proto_in = open(in_file, 'rb') 96 except IOError: 97 print "Failed to open ", in_file, " for reading" 98 exit(-1) 99 return proto_in 100 101def DecodeVarint(in_file): 102 """ 103 The decoding of the Varint32 is copied from 104 google.protobuf.internal.decoder and is only repeated here to 105 avoid depending on the internal functions in the library. If the 106 end of file is reached, return (0, 0). 107 """ 108 result = 0 109 shift = 0 110 pos = 0 111 # Use a 32-bit mask 112 mask = 0xffffffff 113 while 1: 114 c = in_file.read(1) 115 if len(c) == 0: 116 return (0, 0) 117 b = struct.unpack('<B', c)[0] 118 result |= ((b & 0x7f) << shift) 119 pos += 1 120 if not (b & 0x80): 121 if result > 0x7fffffffffffffff: 122 result -= (1 << 64) 123 result |= ~mask 124 else: 125 result &= mask 126 return (result, pos) 127 shift += 7 128 if shift >= 64: 129 raise IOError('Too many bytes when decoding varint.') 130 131def decodeMessage(in_file, message): 132 """ 133 Attempt to read a message from the file and decode it. Return 134 False if no message could be read. 135 """ 136 try: 137 size, pos = DecodeVarint(in_file) 138 if size == 0: 139 return False 140 buf = in_file.read(size) 141 message.ParseFromString(buf) 142 return True 143 except IOError: 144 return False 145 146def EncodeVarint(out_file, value): 147 """ 148 The encoding of the Varint32 is copied from 149 google.protobuf.internal.encoder and is only repeated here to 150 avoid depending on the internal functions in the library. 151 """ 152 bits = value & 0x7f 153 value >>= 7 154 while value: 155 out_file.write(struct.pack('<B', 0x80|bits)) 156 bits = value & 0x7f 157 value >>= 7 158 out_file.write(struct.pack('<B', bits)) 159 160def encodeMessage(out_file, message): 161 """ 162 Encoded a message with the length prepended as a 32-bit varint. 163 """ 164 out = message.SerializeToString() 165 EncodeVarint(out_file, len(out)) 166 out_file.write(out)
| 2 3# Copyright (c) 2013 ARM Limited 4# All rights reserved 5# 6# The license below extends only to copyright in the software and shall 7# not be construed as granting a license to any other intellectual 8# property including but not limited to intellectual property relating 9# to a hardware implementation of the functionality of the software 10# licensed hereunder. You may use the software subject to the license 11# terms below provided that you ensure that this notice is replicated 12# unmodified and in its entirety in all distributions of the software, 13# modified or unmodified, in source code or in binary form. 14# 15# Redistribution and use in source and binary forms, with or without 16# modification, are permitted provided that the following conditions are 17# met: redistributions of source code must retain the above copyright 18# notice, this list of conditions and the following disclaimer; 19# redistributions in binary form must reproduce the above copyright 20# notice, this list of conditions and the following disclaimer in the 21# documentation and/or other materials provided with the distribution; 22# neither the name of the copyright holders nor the names of its 23# contributors may be used to endorse or promote products derived from 24# this software without specific prior written permission. 25# 26# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 27# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 28# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 29# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 30# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 31# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 32# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 33# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 34# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 35# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 36# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 37# 38# Copyright 2008 Google Inc. All rights reserved. 39# http://code.google.com/p/protobuf/ 40# 41# Redistribution and use in source and binary forms, with or without 42# modification, are permitted provided that the following conditions are 43# met: 44# 45# * Redistributions of source code must retain the above copyright 46# notice, this list of conditions and the following disclaimer. 47# * Redistributions in binary form must reproduce the above 48# copyright notice, this list of conditions and the following disclaimer 49# in the documentation and/or other materials provided with the 50# distribution. 51# * Neither the name of Google Inc. nor the names of its 52# contributors may be used to endorse or promote products derived from 53# this software without specific prior written permission. 54# 55# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 56# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 57# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 58# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 59# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 60# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 61# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 62# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 63# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 64# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 65# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 66# 67# Authors: Andreas Hansson 68# Radhika Jagtap 69 70# This file is a library of commonly used functions used when interfacing 71# with protobuf python messages. For eg, the decode scripts for different 72# types of proto objects can use the same function to decode a single message 73 74import gzip 75import struct 76 77def openFileRd(in_file): 78 """ 79 This opens the file passed as argument for reading using an appropriate 80 function depending on if it is gzipped or not. It returns the file 81 handle. 82 """ 83 try: 84 # First see if this file is gzipped 85 try: 86 # Opening the file works even if it is not a gzip file 87 proto_in = gzip.open(in_file, 'rb') 88 89 # Force a check of the magic number by seeking in the 90 # file. If we do not do it here the error will occur when 91 # reading the first message. 92 proto_in.seek(1) 93 proto_in.seek(0) 94 except IOError: 95 proto_in = open(in_file, 'rb') 96 except IOError: 97 print "Failed to open ", in_file, " for reading" 98 exit(-1) 99 return proto_in 100 101def DecodeVarint(in_file): 102 """ 103 The decoding of the Varint32 is copied from 104 google.protobuf.internal.decoder and is only repeated here to 105 avoid depending on the internal functions in the library. If the 106 end of file is reached, return (0, 0). 107 """ 108 result = 0 109 shift = 0 110 pos = 0 111 # Use a 32-bit mask 112 mask = 0xffffffff 113 while 1: 114 c = in_file.read(1) 115 if len(c) == 0: 116 return (0, 0) 117 b = struct.unpack('<B', c)[0] 118 result |= ((b & 0x7f) << shift) 119 pos += 1 120 if not (b & 0x80): 121 if result > 0x7fffffffffffffff: 122 result -= (1 << 64) 123 result |= ~mask 124 else: 125 result &= mask 126 return (result, pos) 127 shift += 7 128 if shift >= 64: 129 raise IOError('Too many bytes when decoding varint.') 130 131def decodeMessage(in_file, message): 132 """ 133 Attempt to read a message from the file and decode it. Return 134 False if no message could be read. 135 """ 136 try: 137 size, pos = DecodeVarint(in_file) 138 if size == 0: 139 return False 140 buf = in_file.read(size) 141 message.ParseFromString(buf) 142 return True 143 except IOError: 144 return False 145 146def EncodeVarint(out_file, value): 147 """ 148 The encoding of the Varint32 is copied from 149 google.protobuf.internal.encoder and is only repeated here to 150 avoid depending on the internal functions in the library. 151 """ 152 bits = value & 0x7f 153 value >>= 7 154 while value: 155 out_file.write(struct.pack('<B', 0x80|bits)) 156 bits = value & 0x7f 157 value >>= 7 158 out_file.write(struct.pack('<B', bits)) 159 160def encodeMessage(out_file, message): 161 """ 162 Encoded a message with the length prepended as a 32-bit varint. 163 """ 164 out = message.SerializeToString() 165 EncodeVarint(out_file, len(out)) 166 out_file.write(out)
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