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//
// Copyright (c) SAS Institute Inc.
//
// 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.
//
package authenticode
import (
"bytes"
"encoding/binary"
"io"
)
// read bytes from a stream and return a byte slice, also feeding a hash
func readAndHash(r io.Reader, d io.Writer, n int) ([]byte, error) {
if n == 0 {
return nil, nil
}
buf := make([]byte, n)
if _, err := io.ReadFull(r, buf); err != nil {
return nil, err
}
if d != nil {
if _, err := d.Write(buf); err != nil {
return nil, err
}
}
return buf, nil
}
// read from a byte slice into a structure
func binaryReadBytes(buf []byte, val interface{}) error {
return binary.Read(bytes.NewReader(buf), binary.LittleEndian, val)
}
// pad an address to a multiple of align
func align32(addr, align uint32) uint32 {
n := addr % align
if n != 0 {
addr += align - n
}
return addr
}
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