Module: Omnizip::Filters::Bcj2Constants

Included in:

Bcj2Decoder, Bcj2Encoder, Bcj2StreamData

Defined in:

lib/omnizip/filters/bcj2/constants.rb

Constant Summary

NUM_STREAMS =

Number of output streams

4

STREAM_MAIN =

Stream indices

0

STREAM_CALL =

Main data stream (non-convertible bytes)

1

STREAM_JUMP =

CALL instruction addresses (E8)

2

STREAM_RC =

JUMP instruction addresses (E9)

3

OPCODE_CALL =

x86 opcodes

0xE8

OPCODE_JUMP =

CALL instruction

0xE9

ADDRESS_SIZE =

Size of x86 address (4 bytes, little-endian)

4

TOP_VALUE =

Range coder constants

1 << 24

BIT_MODEL_TOTAL_BITS =

Range normalization threshold

11

BIT_MODEL_TOTAL =

Probability model bits

1 << BIT_MODEL_TOTAL_BITS

MOVE_BITS =

Probability update shift

5

NUM_PROBS =

Number of probability models (2 + 256)

• 2 for general cases (not E8/E9, or 0F8x pattern)
• 256 for byte-specific models when processing E8

2 + 256

INITIAL_PROB =

Initial probability value (50%)

BIT_MODEL_TOTAL >> 1