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49 lines
1.9 KiB
49 lines
1.9 KiB
13 years ago
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#!/usr/bin/env python
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import os, sys
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from random import randrange
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import argparse
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def main():
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CHUNKSIZE=2**20
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parser = argparse.ArgumentParser(prog="randfile", description="Create a file of pseudorandom bytes (not cryptographically secure).")
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parser.add_argument('-b', '--num-bytes', help="how many bytes to write per output file (default 20)", type=int, metavar="BYTES", default=20)
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parser.add_argument('-f', '--output-file-prefix', help="prefix of the name of the output file to create and fill with random bytes (default \"randfile\"", metavar="OUTFILEPRE", default="randfile")
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parser.add_argument('-n', '--num-files', help="how many files to write (default 1)", type=int, metavar="FILES", default=1)
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parser.add_argument('-F', '--force', help='overwrite any file already present', action='store_true')
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parser.add_argument('-p', '--progress', help='write an "x" for every file completed and a "." for every %d bytes' % CHUNKSIZE, action='store_true')
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args = parser.parse_args()
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for i in xrange(args.num_files):
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bytesleft = args.num_bytes
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outputfname = args.output_file_prefix + "." + str(i)
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if args.force:
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f = open(outputfname, "wb")
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else:
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flags = os.O_WRONLY|os.O_CREAT|os.O_EXCL | (hasattr(os, 'O_BINARY') and os.O_BINARY)
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fd = os.open(outputfname, flags)
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f = os.fdopen(fd, "wb")
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zs = [0]*CHUNKSIZE
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ts = [256]*CHUNKSIZE
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while bytesleft >= CHUNKSIZE:
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f.write(''.join(map(chr, map(randrange, zs, ts))))
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bytesleft -= CHUNKSIZE
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if args.progress:
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sys.stdout.write(".") ; sys.stdout.flush()
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zs = [0]*bytesleft
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ts = [256]*bytesleft
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f.write(''.join(map(chr, map(randrange, zs, ts))))
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if args.progress:
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sys.stdout.write("x") ; sys.stdout.flush()
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if __name__ == "__main__":
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main()
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