1 // 2 // Copyright (c) SAS Institute Inc. 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 package authenticode 18 19 import ( 20 "bytes" 21 "encoding/binary" 22 "io" 23 ) 24 25 // read bytes from a stream and return a byte slice, also feeding a hash 26 func readAndHash(r io.Reader, d io.Writer, n int) ([]byte, error) { 27 if n == 0 { 28 return nil, nil 29 } 30 buf := make([]byte, n) 31 if _, err := io.ReadFull(r, buf); err != nil { 32 return nil, err 33 } 34 if d != nil { 35 d.Write(buf) 36 } 37 return buf, nil 38 } 39 40 // read from a byte slice into a structure 41 func binaryReadBytes(buf []byte, val interface{}) error { 42 return binary.Read(bytes.NewReader(buf), binary.LittleEndian, val) 43 } 44