ztail Namespace Reference

Classes
class	Decoder

Functions
def	strip_gzip_header

Variables
tuple	args = parser.parse_args()
string	BLOCK_MAGIC = "\x00\x00\xFF\xFF"
tuple	d = Decoder(args.file, args.n)
int	DECOMPRESS_BUF_SIZE = 4
string	ENDLINE_MAGIC = "\n"
tuple	parser = argparse.ArgumentParser(description='tail, but for gzip files (with Z_FULL_SYNC)')

Function Documentation

def ztail.strip_gzip_header

(

body

)

Definition at line 16 of file ztail.py.

Referenced by ztail.Decoder.decode().

def strip_gzip_header(body):
    assert body[0:2] == "\x1f\x8b"
    method, flags, mtime = struct.unpack("<BBIxx", body[2:10])

    FHCRC    = 0x02
    FEXTRA   = 0x04
    FNAME    = 0x08
    FCOMMENT = 0x10

    i = 10

    if flags & FEXTRA:
        size, = struct.unpack("<H", body[i:i+2])
        i += size + 2

    def skip_until_zero(ix):
        while body[ix] != '\x00': ix += 1
        return ix + 1 
    
    if flags & FNAME:    i = skip_until_zero(i)
    if flags & FCOMMENT: i = skip_until_zero(i)
    if flags & FHCRC:    i += 2

    body = body[i:]
    return body