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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 comdoc
import (
"unicode/utf16"
)
type SecID int32
type DirType uint8
type Color uint8
const (
SecIDFree SecID = -1
SecIDEndOfChain SecID = -2
SecIDSAT SecID = -3
SecIDMSAT SecID = -4
)
const (
DirEmpty DirType = 0
DirStorage DirType = 1
DirStream DirType = 2
DirRoot DirType = 5
)
const (
Red Color = 0
Black Color = 1
)
const byteOrderMarker uint16 = 0xfffe
const msatInHeader = 109
var fileMagic = []byte{0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1, 0x1a, 0xe1}
// Raw CDF file header
type Header struct {
Magic [8]byte
UID [16]byte
Revision uint16
Version uint16
ByteOrder uint16
SectorSize uint16 // power of 2
ShortSectorSize uint16 // power of 2
Reserved1 [6]byte
DirSectorCount uint32 // undocumented?
SATSectors uint32
DirNextSector SecID
Reserved2 uint32
MinStdStreamSize uint32
SSATNextSector SecID
SSATSectorCount uint32
MSATNextSector SecID
MSATSectorCount uint32
MSAT [msatInHeader]SecID
}
// Raw CDF directory entry
type RawDirEnt struct {
NameRunes [32]uint16
NameLength uint16
Type DirType
Color Color
LeftChild int32
RightChild int32
StorageRoot int32
UID [16]byte
UserFlags uint32
CreateTime uint64
ModifyTime uint64
NextSector SecID
StreamSize uint32
_ uint32
}
// Return the UTF8 name of this entry
func (e RawDirEnt) Name() string {
used := e.NameLength/2 - 1
if e.Type == DirEmpty || used > 32 {
return ""
}
return string(utf16.Decode(e.NameRunes[:used]))
}
// Parsed CDF directory entry
type DirEnt struct {
RawDirEnt
// Index into the directory stream holding this entry
Index int
name string
}
// Return the UTF8 name of this entry
func (e DirEnt) Name() string {
return e.name
}
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