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
|
local m = {}
local ba = require("flatbuffers.binaryarray")
local bpack = ba.Pack
local bunpack = ba.Unpack
local type_mt = {}
function type_mt:Pack(value)
return bpack(self.packFmt, value)
end
function type_mt:Unpack(buf, pos)
return bunpack(self.packFmt, buf, pos)
end
function type_mt:ValidNumber(n)
if not self.min_value and not self.max_value then return true end
return self.min_value <= n and n <= self.max_value
end
function type_mt:EnforceNumber(n)
-- duplicate code since the overhead of function calls
-- for such a popular method is time consuming
if not self.min_value and not self.max_value then
return
end
if self.min_value <= n and n <= self.max_value then
return
end
error("Number is not in the valid range")
end
function type_mt:EnforceNumbers(a,b)
-- duplicate code since the overhead of function calls
-- for such a popular method is time consuming
if not self.min_value and not self.max_value then
return
end
if self.min_value <= a and a <= self.max_value and self.min_value <= b and b <= self.max_value then
return
end
error("Number is not in the valid range")
end
function type_mt:EnforceNumberAndPack(n)
return bpack(self.packFmt, n)
end
function type_mt:ConvertType(n, otherType)
assert(self.bytewidth == otherType.bytewidth, "Cannot convert between types of different widths")
if self == otherType then
return n
end
return otherType:Unpack(self:Pack(n))
end
local bool_mt =
{
bytewidth = 1,
min_value = false,
max_value = true,
lua_type = type(true),
name = "bool",
packFmt = "<I1",
Pack = function(self, value) return value and "1" or "0" end,
Unpack = function(self, buf, pos) return buf[pos] == "1" end,
ValidNumber = function(self, n) return true end, -- anything is a valid boolean in Lua
EnforceNumber = function(self, n) end, -- anything is a valid boolean in Lua
EnforceNumbers = function(self, a, b) end, -- anything is a valid boolean in Lua
EnforceNumberAndPack = function(self, n) return self:Pack(n) end,
}
local uint8_mt =
{
bytewidth = 1,
min_value = 0,
max_value = 2^8-1,
lua_type = type(1),
name = "uint8",
packFmt = "<I1"
}
local uint16_mt =
{
bytewidth = 2,
min_value = 0,
max_value = 2^16-1,
lua_type = type(1),
name = "uint16",
packFmt = "<I2"
}
local uint32_mt =
{
bytewidth = 4,
min_value = 0,
max_value = 2^32-1,
lua_type = type(1),
name = "uint32",
packFmt = "<I4"
}
local uint64_mt =
{
bytewidth = 8,
min_value = 0,
max_value = 2^64-1,
lua_type = type(1),
name = "uint64",
packFmt = "<I8"
}
local int8_mt =
{
bytewidth = 1,
min_value = -2^7,
max_value = 2^7-1,
lua_type = type(1),
name = "int8",
packFmt = "<i1"
}
local int16_mt =
{
bytewidth = 2,
min_value = -2^15,
max_value = 2^15-1,
lua_type = type(1),
name = "int16",
packFmt = "<i2"
}
local int32_mt =
{
bytewidth = 4,
min_value = -2^31,
max_value = 2^31-1,
lua_type = type(1),
name = "int32",
packFmt = "<i4"
}
local int64_mt =
{
bytewidth = 8,
min_value = -2^63,
max_value = 2^63-1,
lua_type = type(1),
name = "int64",
packFmt = "<i8"
}
local float32_mt =
{
bytewidth = 4,
min_value = nil,
max_value = nil,
lua_type = type(1.0),
name = "float32",
packFmt = "<f"
}
local float64_mt =
{
bytewidth = 8,
min_value = nil,
max_value = nil,
lua_type = type(1.0),
name = "float64",
packFmt = "<d"
}
-- register the base class
setmetatable(bool_mt, {__index = type_mt})
setmetatable(uint8_mt, {__index = type_mt})
setmetatable(uint16_mt, {__index = type_mt})
setmetatable(uint32_mt, {__index = type_mt})
setmetatable(uint64_mt, {__index = type_mt})
setmetatable(int8_mt, {__index = type_mt})
setmetatable(int16_mt, {__index = type_mt})
setmetatable(int32_mt, {__index = type_mt})
setmetatable(int64_mt, {__index = type_mt})
setmetatable(float32_mt, {__index = type_mt})
setmetatable(float64_mt, {__index = type_mt})
m.Uint8 = uint8_mt
m.Uint16 = uint16_mt
m.Uint32 = uint32_mt
m.Uint64 = uint64_mt
m.Int8 = int8_mt
m.Int16 = int16_mt
m.Int32 = int32_mt
m.Int64 = int64_mt
m.Float32 = float32_mt
m.Float64 = float64_mt
m.UOffsetT = uint32_mt
m.VOffsetT = uint16_mt
m.SOffsetT = int32_mt
local GenerateTypes = function(listOfTypes)
for _,t in pairs(listOfTypes) do
t.Pack = function(self, value) return bpack(self.packFmt, value) end
t.Unpack = function(self, buf, pos) return bunpack(self.packFmt, buf, pos) end
end
end
GenerateTypes(m)
-- explicitly execute after GenerateTypes call, as we don't want to define a Pack/Unpack function for it.
m.Bool = bool_mt
return m
|
