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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 cabfile
import "crypto"
const Magic = 0x4643534d // MSCF
type CabinetFlag uint16
const (
FlagPrevCabinet CabinetFlag = 1 << iota
FlagNextCabinet
FlagReservePresent
)
type Header struct {
Magic uint32
Reserved1 uint32
TotalSize uint32
Reserved2 uint32
OffsetFiles uint32
Reserved3 uint32
Version uint16
NumFolders uint16
NumFiles uint16
Flags CabinetFlag
SetID uint16
CabNumber uint16
}
const reserveHeaderSize = 4
type ReserveHeader struct {
HeaderSize uint16
FolderSize uint8
DataSize uint8
}
const signatureHeaderSize = 20
type SignatureHeader struct {
Unknown1 uint32
CabinetSize uint32
SignatureSize uint32
Unknown2, Unknown3 uint32
}
func (sh *SignatureHeader) Size() uint32 {
if sh == nil {
return 0
}
return sh.SignatureSize
}
type FolderHeader struct {
Offset uint32
NumData uint16
Compression uint16
}
// the pieces of Header that are part of the signature
type sigBlob struct {
// skipped fields: Reserved1, CabNumber
Magic uint32
TotalSize uint32
Reserved2 uint32
OffsetFiles uint32
Reserved3 uint32
Version uint16
NumFolders uint16
NumFiles uint16
Flags CabinetFlag
SetID uint16
SigUnknown3 uint32
}
type Cabinet struct {
Header Header
ReserveHeader ReserveHeader
ReserveData []byte
SignatureHeader *SignatureHeader
Signature []byte
}
type CabinetDigest struct {
Cabinet *Cabinet
Imprint []byte
HashFunc crypto.Hash
Patched []byte
}
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