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Inferno #10
30 апреля 2007 |
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Formats - The format of a packed file MegaLZ.
The format of a packed file MegaLZ
Lord Vader
The first byte is copied into vyhod.Vtoroy -
is in bits.
Bits in a byte of bits - from the senior.
If you want a bit, but it is not (all 8 to
nchilis) - a new byte is selected from at
current. From the same selected and bytes, denoted
obtained - but only after the sample
all the bits link.
The format options: - byte, which
ry is selected from the stream.
1 - copied to the output.
000abc - copy an old byte
shift FFF8 + [abc] to current
position in the output
(Abc == 000 - offset FFF8,
abc == 111 - FFFF)
001 - copy 2 bytes at offset
FF00 + (-1 ..- 256)
0100 - copy 3 bytes of
shift FF00 +
0101abcd - copy 3 bytes of
shift (F [abcd] -1) * 256 +
(-257 ..- 4352)
Longer links can be conveniently represented
in the form of 3 parts:
Prefix:
011
The length of the links:
1a -> 4 + [a]
01ab -> 6 + [ab]
001abc -> 10 + [abc]
0001abcd -> 18 + [abcd]
00001abcde -> 34 + [abcde]
000001abcdef -> 66 + [abcdef]
0000001abcdefg -> 130 + [abcdefg] (here the length
no more than 255!)
Displacement:
0 - FF00 + ago (-1 ..- 256)
1abcd - (F [abcd] -1) * 256 +
(-257 ..- 4352)
The label end of the stream:
011000000001
Examples:
000,111 - to repeat the last byte
001 - repeat the last byte
double (offset =- 1, length 2)
011 001101 10000 - link length
% 101 +10 = 15 bytes at offset -4352
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