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if arg[1] == '--help' then
print('Usage:')
print(' '..arg[0]..' 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
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 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
local source = io.open(source_file, 'r')
or error(string.format("source_file %q doesn't exist", source_file))
target:write(('static const uint8_t %s[] = {\n'):format(varname))
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 line in source:lines() do
for i = 1, string.len(line) do
local byte = line:byte(i)
assert(byte ~= 0)
target:write(string.format(' %3u,', byte))
increase_num_bytes()
end
target:write(string.format(' %3u,', string.byte('\n', 1)))
increase_num_bytes()
end
target:write(' 0};\n')
source:close()
end
target:close()
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