84 lines
2.1 KiB
Lua
84 lines
2.1 KiB
Lua
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-- Import
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local ffi = require 'ffi'
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-- Constants
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--------------------------------------------------------------------------------
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-- Util
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local NUMBER_TO_HEX = {
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[00] = '0', [01] = '1', [02] = '2', [03] = '3', [04] = '4', [05] = '5',
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[06] = '6', [07] = '7', [08] = '8', [09] = '9', [10] = 'A', [11] = 'B',
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[12] = 'C', [13] = 'D', [14] = 'E', [15] = 'F',
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}
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local function to_hex (str)
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local l = {}
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for i = 1, #str do
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local v = str:byte(i)
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l[#l+1] = NUMBER_TO_HEX[math.floor(v / 16)]
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l[#l+1] = NUMBER_TO_HEX[v % 16]
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l[#l+1] = ' '
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end
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l[#l] = nil
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return table.concat(l, '')
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end
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local function is_nice_ascii_string (str)
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for i = 1, #str do
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local byte = str:byte(i)
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if not (32 <= byte and byte <= 126) then return false end
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end
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return true
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end
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local function get_type_and_size_of_singular ( ctype )
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local nr_elements = 1
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while true do
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local etype, elements = ctype:match('(.+)%[(%d*)%]$')
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if not elements then break end
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ctype, nr_elements = etype, nr_elements * elements
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end
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return ctype, nr_elements
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end
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--------------------------------------------------------------------------------
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local CDATA_REPR_MATCHER = 'cdata<(.+)>: (0x%w+)'
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return function (value, options, depth, l)
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local native_repr = tostring(value)
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local data_length = ffi.sizeof(value)
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local ctype, addr = native_repr:match(CDATA_REPR_MATCHER)
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l[#l+1] = 'cdata {'
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--l[#l+1] = '\n\tnative = \'' .. native_repr .. '\','
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l[#l+1] = '\n\ttype = ' .. ctype .. ','
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l[#l+1] = '\n\taddr = ' .. addr .. ','
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if data_length then
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-- Size
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local str = ffi.string(value, data_length)
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l[#l+1] = '\n\tsize = ' .. data_length .. ','
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-- Element size and type
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local element_type, nr_elements = get_type_and_size_of_singular(ctype)
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local element_size = data_length / nr_elements
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l[#l+1] = '\n\tnr_e = ' .. nr_elements .. ','
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l[#l+1] = '\n\ttype_e = ' .. element_type .. ','
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l[#l+1] = '\n\tsize_e = ' .. element_size .. ','
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--
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if is_nice_ascii_string(str) then
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l[#l+1] = '\n\tstr = ' .. str .. ','
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end
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l[#l+1] = '\n\tbin = ' .. to_hex(str) .. ','
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end
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l[#l+1] = '\n}'
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end
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