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
|
package main
func (s *Struct) Define(c *Context) {
c.Putln("type %s struct {", s.SrcName())
for _, field := range s.Fields {
field.Define(c)
}
c.Putln("}")
c.Putln("")
// Write function that reads bytes and produces this struct.
s.Read(c)
// Write function that reads bytes and produces a list of this struct.
s.ReadList(c)
// Write function that writes bytes given this struct.
s.Write(c)
// Write function that writes a list of this struct.
s.WriteList(c)
// Write function that computes the size of a list of these structs,
// IF there is a list field in this struct.
if s.HasList() {
s.WriteListSize(c)
}
}
// Read for a struct creates a function 'ReadStructName' that takes a source
// byte slice (i.e., the buffer) and a destination struct, and returns
// the number of bytes read off the buffer.
// 'ReadStructName' should only be used to read raw reply data from the wire.
func (s *Struct) Read(c *Context) {
c.Putln("// %sRead reads a byte slice into a %s value.",
s.SrcName(), s.SrcName())
c.Putln("func %sRead(buf []byte, v *%s) int {", s.SrcName(), s.SrcName())
c.Putln("b := 0")
c.Putln("")
for _, field := range s.Fields {
field.Read(c, "v.")
c.Putln("")
}
c.Putln("return b")
c.Putln("}")
c.Putln("")
}
// ReadList for a struct creates a function 'ReadStructNameList' that takes
// a source (i.e., the buffer) byte slice, and a destination slice and returns
// the number of bytes read from the byte slice.
func (s *Struct) ReadList(c *Context) {
c.Putln("// %sReadList reads a byte slice into a list of %s values.",
s.SrcName(), s.SrcName())
c.Putln("func %sReadList(buf []byte, dest []%s) int {",
s.SrcName(), s.SrcName())
c.Putln("b := 0")
c.Putln("for i := 0; i < len(dest); i++ {")
c.Putln("dest[i] = %s{}", s.SrcName())
c.Putln("b += %sRead(buf[b:], &dest[i])", s.SrcName())
c.Putln("}")
c.Putln("return xgb.Pad(b)")
c.Putln("}")
c.Putln("")
}
func (s *Struct) Write(c *Context) {
c.Putln("// Bytes writes a %s value to a byte slice.", s.SrcName())
c.Putln("func (v %s) Bytes() []byte {", s.SrcName())
c.Putln("buf := make([]byte, %s)", s.Size().Reduce("v."))
c.Putln("b := 0")
c.Putln("")
for _, field := range s.Fields {
field.Write(c, "v.")
c.Putln("")
}
c.Putln("return buf[:b]")
c.Putln("}")
c.Putln("")
}
func (s *Struct) WriteList(c *Context) {
c.Putln("// %sListBytes writes a list of %s values to a byte slice.",
s.SrcName(), s.SrcName())
c.Putln("func %sListBytes(buf []byte, list []%s) int {",
s.SrcName(), s.SrcName())
c.Putln("b := 0")
c.Putln("var structBytes []byte")
c.Putln("for _, item := range list {")
c.Putln("structBytes = item.Bytes()")
c.Putln("copy(buf[b:], structBytes)")
c.Putln("b += len(structBytes)")
c.Putln("}")
c.Putln("return xgb.Pad(b)")
c.Putln("}")
c.Putln("")
}
func (s *Struct) WriteListSize(c *Context) {
c.Putln("// %sListSize computes the size (bytes) of a list of %s values.",
s.SrcName(), s.SrcName())
c.Putln("func %sListSize(list []%s) int {", s.SrcName(), s.SrcName())
c.Putln("size := 0")
if s.Size().Expression.Concrete() {
c.Putln("for _ = range list {")
} else {
c.Putln("for _, item := range list {")
}
c.Putln("size += %s", s.Size().Reduce("item."))
c.Putln("}")
c.Putln("return size")
c.Putln("}")
c.Putln("")
}
|
