root/galaxy-central/eggs/bx_python-0.5.0_dev_f74aec067563-py2.6-macosx-10.6-universal-ucs2.egg/EGG-INFO/scripts/lzop_build_offset_table.py

リビジョン 3, 2.8 KB (コミッタ: kohda, 14 年 前)

Install Unix tools  http://hannonlab.cshl.edu/galaxy_unix_tools/galaxy.html

行番号 
1#!/usr/bin/python2.6
2
3"""
4Read a compressed file as created by 'lzop' from stdin and write a table to
5stdout containing the blocksize and the start offset (in bytes) of each
6compressed block.
7
8usage: %prog < FILENAME.lzo > FILENAME.lzot
9"""
10
11import struct, sys
12
13MAGIC="\x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a"
14
15F_ADLER32_D     = 0x00000001L
16F_ADLER32_C     = 0x00000002L
17F_H_EXTRA_FIELD = 0x00000040L
18F_H_GMTDIFF     = 0x00000080L
19F_CRC32_D       = 0x00000100L
20F_CRC32_C       = 0x00000200L
21F_MULTIPART     = 0x00000400L
22F_H_FILTER      = 0x00000800L
23F_H_CRC32       = 0x00001000L
24
25assert struct.calcsize( "!H" ) == 2
26assert struct.calcsize( "!I" ) == 4
27
28class UnpackWrapper( object ):
29    def __init__( self, file ):
30        self.file = file
31    def read( self, amt ):
32        return self.file.read( amt )
33    def get( self, fmt ):
34        t = struct.unpack( fmt, self.file.read( struct.calcsize( fmt ) ) )
35        return t[0]
36
37def main():
38    f = UnpackWrapper( sys.stdin )
39    # Read header
40    magic = f.read(9)
41    assert magic == MAGIC, "Not LZOP file"
42    version = f.get( "!H" )
43    lib_version = f.get( "!H" )
44    if version >= 0x0940:
45        extract_version = f.get( "!H" )
46    method = f.get( "!B" )
47    assert 1 <= method <= 3, "Only LZO compression is currently supported"
48    level = f.get( "!B" )
49    flags = f.get( "!I" )
50    assert not( flags & F_H_FILTER ), "LZOP filters not supported"
51    has_compressed_crc = ( flags & F_CRC32_C or flags & F_ADLER32_C )
52    has_uncompressed_crc = ( flags & F_CRC32_D or flags & F_ADLER32_D )
53    mode = f.get( "!I" )
54    time = f.get( "!I" )
55    time_offset = f.get( "!I" )
56    fname_len = f.get( "!B" )
57    fname = f.read( fname_len )
58    assert len( fname ) == fname_len, "EOF reading filename"
59    header_crc = f.get( "!I" )
60    if ( flags & F_H_EXTRA_FIELD ):
61        extra_len = f.get( "!I" )
62        extra = f.read( extra_len )
63        assert len( extra ) == extra_len, "EOF reading extra field"
64    # Done with header
65    block_size = None
66    expect_no_more = False
67    # Read blocks
68    while 1:
69        size = f.get( "!I" )
70        if size == 0: break
71        assert not( expect_no_more ), \
72            "Encountered an undersized block that was not the last block"
73        if block_size is None:
74            print "s", size
75            block_size = size
76        else:
77            if size < block_size:
78                expect_no_more = True
79        compressed_size = f.get( "!I" )
80        if has_uncompressed_crc:
81            crc = f.get( "!I" )
82        if has_compressed_crc:
83            compressed_crc = f.get( "!I" )
84        print "o", f.file.tell(), compressed_size, size
85        compressed_data = f.read( compressed_size )
86        assert len( compressed_data ) == compressed_size, \
87            "EOF reading compressed data"
88
89if __name__ == "__main__":
90    main()
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