| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| package openwhisk |
| |
| // IsElf checks for a Linux executable |
| func IsElf(buf []byte) bool { |
| return len(buf) > 52 && |
| buf[0] == 0x7F && buf[1] == 0x45 && |
| buf[2] == 0x4C && buf[3] == 0x46 |
| } |
| |
| // IsExe checks for a Windows executable |
| func IsExe(buf []byte) bool { |
| return len(buf) > 1 && |
| buf[0] == 0x4D && buf[1] == 0x5A |
| } |
| |
| // IsMach64 checks for OSX executable |
| func IsMach64(buf []byte) bool { |
| return len(buf) > 4 && |
| buf[0] == 0xcf && buf[1] == 0xfa && |
| buf[2] == 0xed && buf[3] == 0xfe |
| } |
| |
| // IsBangPath checks for a shell executable |
| func IsBangPath(buf []byte) bool { |
| return len(buf) > 2 && |
| buf[0] == '#' && buf[1] == '!' |
| } |
| |
| // IsExecutable check if it is an executable, according the current runtime |
| func IsExecutable(buf []byte, runtime string) bool { |
| Debug("checking executable for %s", runtime) |
| switch runtime { |
| case "darwin": |
| return IsMach64(buf) || IsBangPath(buf) |
| case "linux": |
| return IsElf(buf) || IsBangPath(buf) |
| case "windows": |
| return IsExe(buf) |
| default: |
| return false |
| } |
| } |
| |
| // IsZip checks if it is a zip file |
| func IsZip(buf []byte) bool { |
| return len(buf) > 3 && |
| buf[0] == 0x50 && buf[1] == 0x4B && |
| (buf[2] == 0x3 || buf[2] == 0x5 || buf[2] == 0x7) && |
| (buf[3] == 0x4 || buf[3] == 0x6 || buf[3] == 0x8) |
| } |