Mon, 27 Jul 2009 04:33:20 +0100
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1 | -- Minichunkspy: Disassemble and reassemble chunks. |
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2 | -- Copyright M Joonas Pihlaja 2009 |
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3 | -- MIT license |
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4 | -- |
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5 | -- minichunkspy = require"minichunkspy" |
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6 | -- |
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7 | -- chunk = string.dump(loadfile"blabla.lua") |
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8 | -- disassembled_chunk = minichunkspy.disassemble(chunk) |
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9 | -- chunk = minichunkspy.assemble(disassembled_chunk) |
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10 | -- assert(minichunkspy.validate(<function or chunk>)) |
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11 | -- |
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12 | -- Tested on little-endian 32 bit platforms. Modify |
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13 | -- the Size_t type to be a 64 bit integer to make it work |
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14 | -- for 64 bit systems, and set BIG_ENDIAN = true for |
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15 | -- big-endian systems. |
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16 | local string, table, math = string, table, math |
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17 | local ipairs, setmetatable, type, assert = ipairs, setmetatable, type, assert |
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18 | local _ = __END_OF_GLOBALS__ |
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19 | local string_char, string_byte, string_sub = string.char, string.byte, string.sub |
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20 | local table_concat = table.concat |
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21 | local math_abs, math_ldexp, math_frexp = math.abs, math.ldexp, math.frexp |
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22 | local Inf = math.huge |
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23 | local Nan = Inf - Inf |
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24 | |
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25 | local BIG_ENDIAN = false --twiddle this for your platform. |
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26 | |
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27 | local function construct (class, ...) |
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28 | return class.new(class, ...) |
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29 | end |
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30 | |
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31 | local mt_memo = {} |
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32 | |
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33 | local Field = construct{ |
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34 | new = |
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35 | function (class, self) |
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36 | local self = self or {} |
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37 | local mt = mt_memo[class] or { |
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38 | __index = class, |
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39 | __call = construct |
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40 | } |
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41 | mt_memo[class] = mt |
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42 | return setmetatable(self, mt) |
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43 | end, |
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44 | } |
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45 | |
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46 | local None = Field{ |
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47 | unpack = function (self, bytes, ix) return nil, ix end, |
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48 | pack = function (self, val) return "" end |
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49 | } |
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50 | |
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51 | local char_memo = {} |
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52 | |
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53 | local function char(n) |
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54 | local field = char_memo[n] or Field{ |
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55 | unpack = function (self, bytes, ix) |
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56 | return string_sub(bytes, ix, ix+n-1), ix+n |
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57 | end, |
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58 | pack = function (self, val) return string_sub(val, 1, n) end |
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59 | } |
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60 | char_memo[n] = field |
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61 | return field |
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62 | end |
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63 | |
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64 | local uint8 = Field{ |
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65 | unpack = function (self, bytes, ix) |
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66 | return string_byte(bytes, ix, ix), ix+1 |
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67 | end, |
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68 | pack = function (self, val) return string_char(val) end |
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69 | } |
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70 | |
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71 | local uint32 = Field{ |
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72 | unpack = |
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73 | function (self, bytes, ix) |
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74 | local a,b,c,d = string_byte(bytes, ix, ix+3) |
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75 | if BIG_ENDIAN then a,b,c,d = d,c,b,a end |
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76 | return a + b*256 + c*256^2 + d*256^3, ix+4 |
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77 | end, |
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78 | pack = |
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79 | function (self, val) |
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80 | assert(type(val) == "number", |
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81 | "unexpected value type to pack as an uint32") |
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82 | local a,b,c,d |
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83 | d = val % 2^32 |
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84 | a = d % 256; d = (d - a) / 256 |
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85 | b = d % 256; d = (d - b) / 256 |
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86 | c = d % 256; d = (d - c) / 256 |
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87 | if BIG_ENDIAN then a,b,c,d = d,c,b,a end |
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88 | return string_char(a,b,c,d) |
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89 | end |
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90 | } |
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91 | |
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92 | local int32 = uint32{ |
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93 | unpack = function (self, bytes, ix) |
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94 | local val, ix = uint32:unpack(bytes, ix) |
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95 | return val < 2^32 and val or (val - 2^31), ix |
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96 | end |
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97 | } |
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98 | |
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99 | local Byte = uint8 |
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100 | local Size_t = uint32 |
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101 | local Integer = int32 |
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102 | |
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103 | -- Opaque types: |
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104 | local Number = char(8) |
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105 | local Insn = char(4) |
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106 | |
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107 | local Struct = Field{ |
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108 | unpack = |
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109 | function (self, bytes, ix) |
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110 | local val = {} |
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111 | local i,j = 1,1 |
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112 | while self[i] do |
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113 | local field = self[i] |
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114 | local key = field.name |
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115 | if not key then key, j = j, j+1 end |
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116 | --print("unpacking struct field", key, " at index ", ix) |
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117 | val[key], ix = field:unpack(bytes, ix) |
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118 | i = i+1 |
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119 | end |
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120 | return val, ix |
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121 | end, |
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122 | pack = |
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123 | function (self, val) |
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124 | local data = {} |
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125 | local i,j = 1,1 |
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126 | while self[i] do |
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127 | local field = self[i] |
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128 | local key = field.name |
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129 | if not key then key, j = j, j+1 end |
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130 | data[i] = field:pack(val[key]) |
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131 | i = i+1 |
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132 | end |
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133 | return table_concat(data) |
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134 | end |
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135 | } |
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136 | |
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137 | local List = Field{ |
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138 | unpack = |
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139 | function (self, bytes, ix) |
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140 | local len, ix = Integer:unpack(bytes, ix) |
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141 | local vals = {} |
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142 | local field = self.type |
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143 | for i=1,len do |
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144 | --print("unpacking list field", i, " at index ", ix) |
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145 | vals[i], ix = field:unpack(bytes, ix) |
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146 | end |
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147 | return vals, ix |
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148 | end, |
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149 | pack = |
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150 | function (self, vals) |
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151 | local len = #vals |
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152 | local data = { Integer:pack(len) } |
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153 | local field = self.type |
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154 | for i=1,len do |
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155 | data[#data+1] = field:pack(vals[i]) |
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156 | end |
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157 | return table_concat(data) |
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158 | end |
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159 | } |
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160 | |
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161 | local Boolean = Field{ |
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162 | unpack = |
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163 | function (self, bytes, ix) |
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164 | local val, ix = Integer:unpack(bytes, ix) |
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165 | assert(val == 0 or val == 1, |
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166 | "unpacked an unexpected value "..val.." for a Boolean") |
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167 | return val == 1, ix |
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168 | end, |
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169 | pack = |
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170 | function (self, val) |
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171 | assert(type(val) == "boolean", |
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172 | "unexpected value type to pack as a Boolean") |
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173 | return Integer:pack(val and 1 or 0) |
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174 | end |
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175 | } |
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176 | |
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177 | local String = Field{ |
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178 | unpack = |
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179 | function (self, bytes, ix) |
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180 | local len, ix = Integer:unpack(bytes, ix) |
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181 | local val = nil |
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182 | if len > 0 then |
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183 | -- len includes trailing nul byte; ignore it |
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184 | local string_len = len - 1 |
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185 | val = bytes:sub(ix, ix+string_len-1) |
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186 | end |
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187 | return val, ix + len |
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188 | end, |
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189 | pack = |
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190 | function (self, val) |
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191 | assert(type(val) == "nil" or type(val) == "string", |
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192 | "unexpected value type to pack as a String") |
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193 | if val == nil then |
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194 | return Integer:pack(0) |
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195 | end |
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196 | return Integer:pack(#val+1) .. val .. "\000" |
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197 | end |
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198 | } |
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199 | |
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200 | local ChunkHeader = Struct{ |
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201 | char(4){name = "signature"}, |
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202 | Byte{name = "version"}, |
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203 | Byte{name = "format"}, |
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204 | Byte{name = "endianness"}, |
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205 | Byte{name = "sizeof_int"}, |
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206 | Byte{name = "sizeof_size_t"}, |
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207 | Byte{name = "sizeof_insn"}, |
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208 | Byte{name = "sizeof_Number"}, |
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209 | Byte{name = "integral_flag"}, |
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210 | } |
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211 | |
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212 | local ConstantTypes = { |
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213 | [0] = None, |
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214 | [1] = Boolean, |
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215 | [3] = Number, |
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216 | [4] = String, |
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217 | } |
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218 | local Constant = Field{ |
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219 | unpack = |
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220 | function (self, bytes, ix) |
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221 | local t, ix = Byte:unpack(bytes, ix) |
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222 | local field = ConstantTypes[t] |
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223 | assert(field, "unknown constant type "..t.." to unpack") |
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224 | local v, ix = field:unpack(bytes, ix) |
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225 | return { |
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226 | type = t, |
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227 | value = v |
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228 | }, ix |
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229 | end, |
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230 | pack = |
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231 | function (self, val) |
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232 | local t, v = val.type, val.value |
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233 | return Byte:pack(t) .. ConstantTypes[t]:pack(v) |
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234 | end |
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235 | } |
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236 | |
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237 | local Local = Struct{ |
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238 | String{name = "name"}, |
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239 | Integer{name = "startpc"}, |
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240 | Integer{name = "endpc"} |
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241 | } |
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242 | |
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243 | local Function = Struct{ |
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244 | String{name = "name"}, |
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245 | Integer{name = "line"}, |
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246 | Integer{name = "last_line"}, |
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247 | Byte{name = "num_upvalues"}, |
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248 | Byte{name = "num_parameters"}, |
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249 | Byte{name = "is_vararg"}, |
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250 | Byte{name = "max_stack_size"}, |
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251 | List{name = "insns", type = Insn}, |
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252 | List{name = "constants", type = Constant}, |
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253 | List{name = "prototypes", type = nil}, --patch type below |
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254 | List{name = "source_lines", type = Integer}, |
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255 | List{name = "locals", type = Local}, |
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256 | List{name = "upvalues", type = String}, |
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257 | } |
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258 | assert(Function[10].name == "prototypes", |
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259 | "missed the function prototype list") |
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260 | Function[10].type = Function |
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261 | |
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262 | local Chunk = Struct{ |
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263 | ChunkHeader{name = "header"}, |
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264 | Function{name = "body"} |
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265 | } |
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266 | |
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267 | local function validate(chunk) |
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268 | if type(chunk) == "function" then |
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269 | return validate(string.dump(chunk)) |
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270 | end |
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271 | local f = Chunk:unpack(chunk, 1) |
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272 | local chunk2 = Chunk:pack(f) |
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273 | |
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274 | if chunk == chunk2 then return true end |
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275 | |
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276 | local i |
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277 | local len = math.min(#chunk, #chunk2) |
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278 | for i=1,len do |
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279 | local a = chunk:sub(i,i) |
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280 | local b = chunk:sub(i,i) |
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281 | if a ~= b then |
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282 | return false, ("chunk roundtripping failed: ".. |
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283 | "first byte difference at index %d"):format(i) |
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284 | end |
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285 | end |
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286 | return false, ("chunk round tripping failed: ".. |
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287 | "original length %d vs. %d"):format(#chunk, #chunk2) |
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288 | end |
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289 | |
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290 | return { |
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291 | disassemble = function (chunk) return Chunk:unpack(chunk, 1) end, |
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292 | assemble = function (disassembled) return Chunk:pack(disassembled) end, |
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293 | validate = validate |
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294 | } |