1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
package hotline
import (
"encoding/binary"
"fmt"
"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 []byte // Always "FILP"
Version []byte // Always 1
RSVD []byte // Always empty zeros
ForkCount []byte // Always 2
}
// NewFlatFileHeader returns a FlatFileHeader struct
func NewFlatFileHeader() FlatFileHeader {
return FlatFileHeader{
Format: []byte("FILP"),
Version: []byte{0, 1},
RSVD: make([]byte, 16),
ForkCount: []byte{0, 2},
}
}
// FlatFileInformationForkHeader is the second section of a "Flattened File Object"
type FlatFileInformationForkHeader struct {
ForkType []byte // Always "INFO"
CompressionType []byte // Always 0; Compression was never implemented in the Hotline protocol
RSVD []byte // Always zeros
DataSize []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) FlatFileInformationFork {
return FlatFileInformationFork{
Platform: []byte("AMAC"), // TODO: Remove hardcode to support "AWIN" Platform (maybe?)
TypeSignature: []byte(fileTypeFromFilename(fileName)), // TODO: Don't infer types from filename
CreatorSignature: []byte(fileCreatorFromFilename(fileName)), // 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: []byte{0x07, 0x70, 0x00, 0x00, 0xba, 0x74, 0x24, 0x73}, // TODO: implement
ModifyDate: []byte{0x07, 0x70, 0x00, 0x00, 0xba, 0x74, 0x24, 0x73}, // TODO: implement
NameScript: make([]byte, 2), // TODO: What is this?
Name: []byte(fileName),
Comment: []byte("TODO"), // TODO: implement (maybe?)
}
}
// Size of the flat file information fork, which is the fixed size of 72 bytes
// plus the number of bytes in the FileName
// TODO: plus the size of the Comment!
func (ffif FlatFileInformationFork) DataSize() []byte {
size := make([]byte, 4)
nameLen := len(ffif.Name)
//TODO: Can I do math directly on two byte slices?
dataSize := nameLen + 74
binary.BigEndian.PutUint32(size, uint32(dataSize))
return size
}
func (ffo flattenedFileObject) TransferSize() []byte {
payloadSize := len(ffo.Payload())
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 []byte
CompressionType []byte
RSVD []byte
DataSize []byte
}
func NewFlatFileDataForkHeader() FlatFileDataForkHeader {
return FlatFileDataForkHeader{
ForkType: []byte("DATA"),
CompressionType: []byte{0, 0, 0, 0},
RSVD: []byte{0, 0, 0, 0},
// DataSize: []byte{0, 0, 0x03, 0xc3},
}
}
// ReadFlattenedFileObject parses a byte slice into a flattenedFileObject
func ReadFlattenedFileObject(bytes []byte) flattenedFileObject {
nameSize := bytes[110:112]
bs := binary.BigEndian.Uint16(nameSize)
nameEnd := 112 + bs
commentSize := bytes[nameEnd : nameEnd+2]
commentLen := binary.BigEndian.Uint16(commentSize)
commentStartPos := int(nameEnd) + 2
commentEndPos := int(nameEnd) + 2 + int(commentLen)
comment := bytes[commentStartPos:commentEndPos]
//dataSizeField := bytes[nameEnd+14+commentLen : nameEnd+18+commentLen]
//dataSize := binary.BigEndian.Uint32(dataSizeField)
ffo := flattenedFileObject{
FlatFileHeader: FlatFileHeader{
Format: bytes[0:4],
Version: bytes[4:6],
RSVD: bytes[6:22],
ForkCount: bytes[22:24],
},
FlatFileInformationForkHeader: FlatFileInformationForkHeader{
ForkType: bytes[24:28],
CompressionType: bytes[28:32],
RSVD: bytes[32:36],
DataSize: bytes[36:40],
},
FlatFileInformationFork: FlatFileInformationFork{
Platform: bytes[40:44],
TypeSignature: bytes[44:48],
CreatorSignature: bytes[48:52],
Flags: bytes[52:56],
PlatformFlags: bytes[56:60],
RSVD: bytes[60:92],
CreateDate: bytes[92:100],
ModifyDate: bytes[100:108],
NameScript: bytes[108:110],
NameSize: bytes[110:112],
Name: bytes[112:nameEnd],
CommentSize: bytes[nameEnd : nameEnd+2],
Comment: comment,
},
FlatFileDataForkHeader: FlatFileDataForkHeader{
ForkType: bytes[commentEndPos : commentEndPos+4],
CompressionType: bytes[commentEndPos+4 : commentEndPos+8],
RSVD: bytes[commentEndPos+8 : commentEndPos+12],
DataSize: bytes[commentEndPos+12 : commentEndPos+16],
},
}
return ffo
}
func (f flattenedFileObject) Payload() []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...)
// TODO: Implement commentlen and comment field
out = append(out, []byte{0, 0}...)
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(filePath string, fileName string) (flattenedFileObject, error) {
file, err := os.Open(fmt.Sprintf("%v/%v", filePath, fileName))
if err != nil {
return flattenedFileObject{}, err
}
defer file.Close()
fileInfo, err := file.Stat()
if err != nil {
return flattenedFileObject{}, err
}
dataSize := make([]byte, 4)
binary.BigEndian.PutUint32(dataSize, uint32(fileInfo.Size()))
return flattenedFileObject{
FlatFileHeader: NewFlatFileHeader(),
FlatFileInformationFork: NewFlatFileInformationFork(fileName),
FlatFileDataForkHeader: FlatFileDataForkHeader{
ForkType: []byte("DATA"),
CompressionType: []byte{0, 0, 0, 0},
RSVD: []byte{0, 0, 0, 0},
DataSize: dataSize,
},
}, nil
}
|
