#!/usr/bin/python3
"Embed zlib compressed data as a C string."
import zlib
import sys


safe = set(range(ord(' '), ord('~')+1))
for c in '"\\':
    safe.remove(ord(c))

def format(buf):
    return f'    "{"".join(buf)}"\n'

def embed(outdata, maxwidth):
    width = 0
    buf = []
    empty = []

    for b in outdata:
        c = chr(b) if b in safe else f"\\{b:03o}"
        if len(c) + width > maxwidth:
            yield format(buf)
            buf[:] = empty
            width = 0
        buf.append(c)
        width += len(c)

    yield format(buf)

def main(infname, maxwidth, log=lambda s: 0):
    indata = open(infname, 'rb').read()
    outdata = zlib.compress(indata)
    log(f'{len(indata)} compress to {len(outdata)}\n')
    return embed(outdata, maxwidth)

if __name__ == '__main__':
    sys.stdout.writelines(main(sys.argv[1], 40, sys.stderr.write))