ble - (fixed) bit length encoding

[Sportman]

Ble is a (fixed) bit length encoder, it accept parameter 1-7 bits for 1 byte, 9-15 bits for 2 bytes or 17-23 bits for 3 bytes.
It read 1, 2 or 3 byte(s) depending the parameter bit(s) provided till 2 ^ bit(s) unique values are reached, then it write a header and bitmap (one time encoded if possible) and the 1 bit or smaller encoded input values, this is repeated till end of file.

The bitmap is encoded by:
00 = 0
01 = 1 01
10 = 1 10
11 = 1 11

Bit values 6, 11 and 17 are often best for text files.

Ble can also be used to expand files.

Download:
http://www.metacompressor.com/download/ble.zip

Windows 32/64-bit command line version.
Need Microsoft .NET framework 4.6.1.

Example:

Encode:
ble 7 input output

Decode:
ble -d input output

[ivan2k2]

The bitmap is encoded by:
00 = 0
01 = 1 01
10 = 1 10
11 = 1 11

Hint: encoding based on bit pair frequency could improve compression when 00 is not frequent .

[Jaff]

WinXP 32bit fix (subversion): replace @offset C8 byte 06 with 04

[Sportman]

WinXP 32bit

Download Microsoft .NET framework 4.0 version for XP 32/64-bit:
http://www.metacompressor.com/download/ble-xp.zip

[Jaff]

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