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Simple GDSII parser
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| -- A basic GDSII reader that reads from standard input and writes serialized | |
| -- text to standard output | |
| local gdsii = {} | |
| gdsii.types = { | |
| [0] = "HEADER", | |
| [1] = "BGNLIB", | |
| [2] = "LIBNAME", | |
| [3] = "UNITS", | |
| [4] = "ENDLIB", | |
| [5] = "BGNSTR", | |
| [6] = "STRNAME", | |
| [7] = "ENDSTR", | |
| [8] = "BOUNDARY", | |
| [9] = "PATH", | |
| [10] = "SREF", | |
| [11] = "AREF", | |
| [12] = "TEXT", | |
| [13] = "LAYER", | |
| [14] = "DATATYPE", | |
| [15] = "WIDTH", | |
| [16] = "XY", | |
| [17] = "ENDEL", | |
| [18] = "SNAME", | |
| [19] = "COLROW", | |
| [20] = "TEXTNODE", | |
| [21] = "NODE", | |
| [22] = "TEXTTYPE", | |
| [23] = "PRESENTATION", | |
| [24] = "SPACING", | |
| [25] = "STRING", | |
| [26] = "STRANS", | |
| [27] = "MAG", | |
| [28] = "ANGLE", | |
| [29] = "UINTEGER", | |
| [30] = "USTRING", | |
| [31] = "REFLIBS", | |
| [32] = "FONTS", | |
| [33] = "PATHTYPE", | |
| [34] = "GENERATIONS", | |
| [35] = "ATTRTABLE", | |
| [36] = "STYPTABLE", | |
| [37] = "STRTYPE", | |
| [38] = "ELFLAGS", | |
| [39] = "ELKEY", | |
| [40] = "LINKTYPE", | |
| [41] = "LINKKEYS", | |
| [42] = "NODETYPE", | |
| [43] = "PROPATTR", | |
| [44] = "PROPVALUE", | |
| [45] = "BOX", | |
| [46] = "BOXTYPE", | |
| [47] = "PLEX", | |
| [48] = "BGNEXTN", | |
| [49] = "ENDEXTN", | |
| [50] = "TAPENUM", | |
| [51] = "TAPECODE", | |
| [52] = "STRCLASS", | |
| [53] = "RESERVED", | |
| [54] = "FORMAT", | |
| [55] = "MASK", | |
| [56] = "ENDMASKS", | |
| [57] = "LIBDIRSIZE", | |
| [58] = "SRFNAME", | |
| [59] = "LIBSECUR", | |
| } | |
| gdsii.datatypes = { | |
| [0] = "NONE", | |
| [1] = "BITARRAY", | |
| [2] = "INT16", | |
| [3] = "INT32", | |
| [4] = "REAL", | |
| [5] = "DOUBLE", | |
| [6] = "STRING", | |
| } | |
| gdsii.read_string = function(f, n) | |
| local data = f:read(n) | |
| assert(#data == n) | |
| return data | |
| end | |
| gdsii.to_uint = function(data) | |
| local n = 0 | |
| for i=1,#data do | |
| n = 256*n + string.byte(data, i) | |
| end | |
| return n | |
| end | |
| gdsii.to_int = function(data) | |
| if bit32.band(string.byte(data, 1), 128) == 0 then | |
| return gdsii.to_uint(data) | |
| end | |
| local n = 0 | |
| for i=1,#data do | |
| n = 256*n + 255 - string.byte(data, i) | |
| end | |
| return -n - 1 | |
| end | |
| gdsii.read_u8 = function(f) | |
| local data = f:read(1) | |
| assert(#data == 1) | |
| return gdsii.to_uint(data) | |
| end | |
| gdsii.read_u16 = function(f) | |
| local data = f:read(2) | |
| assert(#data == 2) | |
| return gdsii.to_uint(data) | |
| end | |
| gdsii.read_i16 = function(f) | |
| local data = f:read(2) | |
| assert(#data == 2) | |
| return gdsii.to_int(data) | |
| end | |
| gdsii.read_i32 = function(f) | |
| local data = f:read(4) | |
| assert(#data == 4) | |
| return gdsii.to_int(data) | |
| end | |
| gdsii.read_real8 = function(f) | |
| local data = f:read(8) | |
| assert(#data == 8) | |
| local n = 0 | |
| for i=2,8 do | |
| n = 256*n + string.byte(data, i) | |
| end | |
| if bit32.band(string.byte(data, 1), 128) ~= 0 then | |
| n = -n | |
| end | |
| local exp = bit32.band(string.byte(data, 1), 127) - 64 - 14 | |
| return n * (16 ^ exp) | |
| end | |
| gdsii.read_bitarray = function(f) | |
| local data = f:read(2) | |
| assert(#data == 2) | |
| local bits = {} | |
| local n = gdsii.to_uint(data) | |
| for i=1,16 do | |
| table.insert(bits, bit32.band(n, 2^(i-1)) ~= 0) | |
| end | |
| return bits | |
| end | |
| gdsii.tokenizer = function(f) | |
| local token = nil | |
| return function() | |
| if token and token.id == "ENDLIB" then return nil end | |
| token = { | |
| length = gdsii.read_u16(f), | |
| id = gdsii.types[gdsii.read_u8(f)], | |
| datatype = gdsii.datatypes[gdsii.read_u8(f)], | |
| } | |
| return token | |
| end | |
| end | |
| gdsii.serialize = function(data) | |
| if type(data) == "string" then | |
| return string.format("%q", data) | |
| elseif type(data) == "table" then | |
| local s = "[" | |
| for k,v in pairs(data) do | |
| if k == 1 then | |
| s = s .. gdsii.serialize(v) | |
| else | |
| s = s .. "," .. gdsii.serialize(v) | |
| end | |
| end | |
| return s .. "]" | |
| else | |
| return tostring(data) | |
| end | |
| end | |
| gdsii.read_data = function(f, token) | |
| local data = {} | |
| if token.datatype == "BITARRAY" then | |
| data = gdsii.read_bitarray(f) | |
| elseif token.datatype == "INT16" then | |
| for i=1,(token.length-4)/2 do | |
| table.insert(data, gdsii.read_i16(f)) | |
| end | |
| elseif token.datatype == "INT32" then | |
| for i=1,(token.length-4)/4 do | |
| table.insert(data, gdsii.read_i32(f)) | |
| end | |
| elseif token.datatype == "DOUBLE" then | |
| for i=1,(token.length-4)/8 do | |
| table.insert(data, gdsii.read_real8(f)) | |
| end | |
| elseif token.datatype == "STRING" then | |
| table.insert(data, gdsii.read_string(f, token.length-4)) | |
| else | |
| f:seek("cur", token.length-4) | |
| end | |
| return data | |
| end | |
| local f = io.input() | |
| for token in gdsii.tokenizer(f) do | |
| local data = gdsii.read_data(f, token) | |
| print(token.id, token.datatype, gdsii.serialize(data)) | |
| end | |
| f:close() |
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