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package hotline
import (
"encoding/binary"
"os"
)
type flattenedFileObject struct {
FlatFileHeader FlatFileHeader
FlatFileInformationForkHeader FlatFileInformationForkHeader
FlatFileInformationFork FlatFileInformationFork
FlatFileDataForkHeader FlatFileDataForkHeader
FileData []byte
}
// FlatFileHeader is the first section of a "Flattened File Object". All fields have static values.
type FlatFileHeader struct {
Format [4]byte // Always "FILP"
Version [2]byte // Always 1
RSVD [16]byte // Always empty zeros
ForkCount [2]byte // Number of forks
}
// NewFlatFileHeader returns a FlatFileHeader struct
func NewFlatFileHeader() FlatFileHeader {
return FlatFileHeader{
Format: [4]byte{0x46, 0x49, 0x4c, 0x50}, // FILP
Version: [2]byte{0, 1},
RSVD: [16]byte{},
ForkCount: [2]byte{0, 2},
}
}
// FlatFileInformationForkHeader is the second section of a "Flattened File Object"
type FlatFileInformationForkHeader struct {
ForkType [4]byte // Always "INFO"
CompressionType [4]byte // Always 0; Compression was never implemented in the Hotline protocol
RSVD [4]byte // Always zeros
DataSize [4]byte // Size of the flat file information fork
}
type FlatFileInformationFork struct {
Platform []byte // Operating System used. ("AMAC" or "MWIN")
TypeSignature []byte // File type signature
CreatorSignature []byte // File creator signature
Flags []byte
PlatformFlags []byte
RSVD []byte
CreateDate []byte
ModifyDate []byte
NameScript []byte // TODO: what is this?
NameSize []byte // Length of file name (Maximum 128 characters)
Name []byte // File name
CommentSize []byte // Length of file comment
Comment []byte // File comment
}
func NewFlatFileInformationFork(fileName string, modifyTime []byte) FlatFileInformationFork {
return FlatFileInformationFork{
Platform: []byte("AMAC"), // TODO: Remove hardcode to support "AWIN" Platform (maybe?)
TypeSignature: []byte(fileTypeFromFilename(fileName).TypeCode), // TODO: Don't infer types from filename
CreatorSignature: []byte(fileTypeFromFilename(fileName).CreatorCode), // TODO: Don't infer types from filename
Flags: []byte{0, 0, 0, 0}, // TODO: What is this?
PlatformFlags: []byte{0, 0, 1, 0}, // TODO: What is this?
RSVD: make([]byte, 32), // Unimplemented in Hotline Protocol
CreateDate: modifyTime, // some filesystems don't support createTime
ModifyDate: modifyTime,
NameScript: make([]byte, 2), // TODO: What is this?
Name: []byte(fileName),
CommentSize: []byte{0, 0},
Comment: []byte{}, // TODO: implement (maybe?)
}
}
// DataSize calculates the size of the flat file information fork, which is
// 72 bytes for the fixed length fields plus the length of the Name + Comment
func (ffif *FlatFileInformationFork) DataSize() []byte {
size := make([]byte, 4)
// TODO: Can I do math directly on two byte slices?
dataSize := len(ffif.Name) + len(ffif.Comment) + 74
binary.BigEndian.PutUint32(size, uint32(dataSize))
return size
}
func (ffo *flattenedFileObject) TransferSize() []byte {
payloadSize := len(ffo.BinaryMarshal())
dataSize := binary.BigEndian.Uint32(ffo.FlatFileDataForkHeader.DataSize[:])
transferSize := make([]byte, 4)
binary.BigEndian.PutUint32(transferSize, dataSize+uint32(payloadSize))
return transferSize
}
func (ffif *FlatFileInformationFork) ReadNameSize() []byte {
size := make([]byte, 2)
binary.BigEndian.PutUint16(size, uint16(len(ffif.Name)))
return size
}
type FlatFileDataForkHeader struct {
ForkType [4]byte
CompressionType [4]byte
RSVD [4]byte
DataSize [4]byte
}
func (ffif *FlatFileInformationFork) UnmarshalBinary(b []byte) error {
nameSize := b[70:72]
bs := binary.BigEndian.Uint16(nameSize)
nameEnd := 72 + bs
commentSize := b[nameEnd : nameEnd+2]
commentLen := binary.BigEndian.Uint16(commentSize)
commentStartPos := int(nameEnd) + 2
commentEndPos := int(nameEnd) + 2 + int(commentLen)
comment := b[commentStartPos:commentEndPos]
ffif.Platform = b[0:4]
ffif.TypeSignature = b[4:8]
ffif.CreatorSignature = b[8:12]
ffif.Flags = b[12:16]
ffif.PlatformFlags = b[16:20]
ffif.RSVD = b[20:52]
ffif.CreateDate = b[52:60]
ffif.ModifyDate = b[60:68]
ffif.NameScript = b[68:70]
ffif.NameSize = b[70:72]
ffif.Name = b[72:nameEnd]
ffif.CommentSize = b[nameEnd : nameEnd+2]
ffif.Comment = comment
return nil
}
func (f *flattenedFileObject) BinaryMarshal() []byte {
var out []byte
out = append(out, f.FlatFileHeader.Format[:]...)
out = append(out, f.FlatFileHeader.Version[:]...)
out = append(out, f.FlatFileHeader.RSVD[:]...)
out = append(out, f.FlatFileHeader.ForkCount[:]...)
out = append(out, []byte("INFO")...)
out = append(out, []byte{0, 0, 0, 0}...)
out = append(out, make([]byte, 4)...)
out = append(out, f.FlatFileInformationFork.DataSize()...)
out = append(out, f.FlatFileInformationFork.Platform...)
out = append(out, f.FlatFileInformationFork.TypeSignature...)
out = append(out, f.FlatFileInformationFork.CreatorSignature...)
out = append(out, f.FlatFileInformationFork.Flags...)
out = append(out, f.FlatFileInformationFork.PlatformFlags...)
out = append(out, f.FlatFileInformationFork.RSVD...)
out = append(out, f.FlatFileInformationFork.CreateDate...)
out = append(out, f.FlatFileInformationFork.ModifyDate...)
out = append(out, f.FlatFileInformationFork.NameScript...)
out = append(out, f.FlatFileInformationFork.ReadNameSize()...)
out = append(out, f.FlatFileInformationFork.Name...)
out = append(out, f.FlatFileInformationFork.CommentSize...)
out = append(out, f.FlatFileInformationFork.Comment...)
out = append(out, f.FlatFileDataForkHeader.ForkType[:]...)
out = append(out, f.FlatFileDataForkHeader.CompressionType[:]...)
out = append(out, f.FlatFileDataForkHeader.RSVD[:]...)
out = append(out, f.FlatFileDataForkHeader.DataSize[:]...)
return out
}
func NewFlattenedFileObject(fileRoot string, filePath, fileName []byte, dataOffset int64) (*flattenedFileObject, error) {
fullFilePath, err := readPath(fileRoot, filePath, fileName)
if err != nil {
return nil, err
}
file, err := effectiveFile(fullFilePath)
if err != nil {
return nil, err
}
defer func(file *os.File) { _ = file.Close() }(file)
fileInfo, err := file.Stat()
if err != nil {
return nil, err
}
dataSize := make([]byte, 4)
binary.BigEndian.PutUint32(dataSize, uint32(fileInfo.Size()-dataOffset))
mTime := toHotlineTime(fileInfo.ModTime())
return &flattenedFileObject{
FlatFileHeader: NewFlatFileHeader(),
FlatFileInformationFork: NewFlatFileInformationFork(string(fileName), mTime),
FlatFileDataForkHeader: FlatFileDataForkHeader{
ForkType: [4]byte{0x44, 0x41, 0x54, 0x41}, // "DATA"
CompressionType: [4]byte{},
RSVD: [4]byte{},
DataSize: [4]byte{dataSize[0], dataSize[1], dataSize[2], dataSize[3]},
},
}, nil
}
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