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if arg[1] == '--help' then
print('Usage:')
print(' '..arg[0]..' [-c] target source varname [source varname]...')
print('')
print('Generates C file with big uint8_t blob.')
print('Blob will be stored in a static const array named varname.')
os.exit()
end
-- Recognized options:
-- -c compile Lua bytecode
local options = {}
while true do
local opt = string.match(arg[1], "^-(%w)")
if not opt then
break
end
options[opt] = true
table.remove(arg, 1)
end
assert(#arg >= 3 and (#arg - 1) % 2 == 0)
local target_file = arg[1] or error('Need a target file')
local target = io.open(target_file, 'w')
target:write('#include <stdint.h>\n\n')
local warn_on_missing_compiler = true
local varnames = {}
for argi = 2, #arg, 2 do
local source_file = arg[argi]
local varname = arg[argi + 1]
if varnames[varname] then
error(string.format("varname %q is already specified for file %q", varname, varnames[varname]))
end
varnames[varname] = source_file
target:write(('static const uint8_t %s[] = {\n'):format(varname))
local output
if options.c then
local luac = os.getenv("LUAC_PRG")
if luac and luac ~= "" then
output = io.popen(luac:format(source_file), "r"):read("*a")
elseif warn_on_missing_compiler then
print("LUAC_PRG is missing, embedding raw source")
warn_on_missing_compiler = false
end
end
if not output then
local source = io.open(source_file, "r")
or error(string.format("source_file %q doesn't exist", source_file))
output = source:read("*a")
source:close()
end
local num_bytes = 0
local MAX_NUM_BYTES = 15 -- 78 / 5: maximum number of bytes on one line
target:write(' ')
local increase_num_bytes
increase_num_bytes = function()
num_bytes = num_bytes + 1
if num_bytes == MAX_NUM_BYTES then
num_bytes = 0
target:write('\n ')
end
end
for i = 1, string.len(output) do
local byte = output:byte(i)
target:write(string.format(' %3u,', byte))
increase_num_bytes()
end
target:write(' 0};\n')
end
target:close()
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