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PUBLIC
CREATE PUBLIC .
PUBLIC SECTION.
TYPES:
BEGIN OF ty_decompress,
raw TYPE xstring,
compressed_len TYPE i,
END OF ty_decompress .
CLASS-METHODS decompress
IMPORTING
!iv_compressed TYPE xsequence
RETURNING
VALUE(rs_data) TYPE ty_decompress .
PROTECTED SECTION.
PRIVATE SECTION.
CONSTANTS: c_maxdcodes TYPE i VALUE 30.
CLASS-DATA: gv_out TYPE xstring,
go_lencode TYPE REF TO zcl_abapgit_zlib_huffman,
go_distcode TYPE REF TO zcl_abapgit_zlib_huffman,
go_stream TYPE REF TO zcl_abapgit_zlib_stream.
TYPES: BEGIN OF ty_pair,
length TYPE i,
distance TYPE i,
END OF ty_pair.
CLASS-METHODS:
decode
IMPORTING io_huffman TYPE REF TO zcl_abapgit_zlib_huffman
RETURNING VALUE(rv_symbol) TYPE i,
map_length
IMPORTING iv_code TYPE i
RETURNING VALUE(rv_length) TYPE i,
map_distance
IMPORTING iv_code TYPE i
RETURNING VALUE(rv_distance) TYPE i,
dynamic,
fixed,
not_compressed,
decode_loop,
read_pair
IMPORTING iv_length TYPE i
RETURNING VALUE(rs_pair) TYPE ty_pair,
copy_out
IMPORTING is_pair TYPE ty_pair.
ENDCLASS.
CLASS zcl_abapgit_zlib IMPLEMENTATION.
METHOD copy_out.
* copy one byte at a time, it is not possible to copy using
* string offsets, as it might copy data that does not exist
* in mv_out yet
DATA: lv_distance TYPE i,
lv_index TYPE i,
lv_x TYPE x LENGTH 1.
lv_distance = xstrlen( gv_out ) - is_pair-distance.
DO is_pair-length TIMES.
lv_index = sy-index - 1 + lv_distance.
lv_x = gv_out+lv_index(1).
CONCATENATE gv_out lv_x INTO gv_out IN BYTE MODE.
ENDDO.
ENDMETHOD.
METHOD decode.
DATA: lv_bit TYPE c LENGTH 1,
lv_len TYPE i,
lv_count TYPE i,
lv_code TYPE i,
lv_index TYPE i,
lv_first TYPE i,
lv_bits TYPE string.
DO zcl_abapgit_zlib_huffman=>c_maxbits TIMES.
lv_len = sy-index.
lv_bit = go_stream->take_bits( 1 ).
CONCATENATE lv_bits lv_bit INTO lv_bits.
lv_code = zcl_abapgit_zlib_convert=>bits_to_int( lv_bits ).
lv_count = io_huffman->get_count( lv_len ).
IF lv_code - lv_count < lv_first.
rv_symbol = io_huffman->get_symbol( lv_index + lv_code - lv_first + 1 ).
RETURN.
ENDIF.
lv_index = lv_index + lv_count.
lv_first = lv_first + lv_count.
lv_first = lv_first * 2.
ENDDO.
ENDMETHOD.
METHOD decode_loop.
DATA lv_x TYPE x.
DATA lv_symbol TYPE i.
DO.
lv_symbol = decode( go_lencode ).
IF lv_symbol < 256.
lv_x = lv_symbol.
CONCATENATE gv_out lv_x INTO gv_out IN BYTE MODE.
ELSEIF lv_symbol = 256.
EXIT.
ELSE.
copy_out( read_pair( lv_symbol ) ).
ENDIF.
ENDDO.
ENDMETHOD.
METHOD decompress.
DATA: lv_bfinal TYPE c LENGTH 1,
lv_btype TYPE c LENGTH 2.
IF iv_compressed IS INITIAL.
RETURN.
ENDIF.
CLEAR gv_out.
CREATE OBJECT go_stream
EXPORTING
iv_data = iv_compressed.
DO.
lv_bfinal = go_stream->take_bits( 1 ).
lv_btype = go_stream->take_bits( 2 ).
CASE lv_btype.
WHEN '00'.
not_compressed( ).
WHEN '01'.
fixed( ).
decode_loop( ).
WHEN '10'.
dynamic( ).
decode_loop( ).
WHEN OTHERS.
ASSERT 1 = 0.
ENDCASE.
IF lv_bfinal = '1'.
EXIT.
ENDIF.
ENDDO.
rs_data-raw = gv_out.
rs_data-compressed_len = xstrlen( iv_compressed ) - go_stream->remaining( ).
ENDMETHOD.
METHOD dynamic.
DATA: lv_nlen TYPE i,
lv_ndist TYPE i,
lv_ncode TYPE i,
lv_index TYPE i,
lv_length TYPE i,
lv_symbol TYPE i,
lt_order TYPE TABLE OF i,
lt_lengths TYPE zcl_abapgit_zlib_huffman=>ty_lengths,
lt_dists TYPE zcl_abapgit_zlib_huffman=>ty_lengths.
FIELD-SYMBOLS: <lv_length> LIKE LINE OF lt_lengths.
APPEND 16 TO lt_order.
APPEND 17 TO lt_order.
APPEND 18 TO lt_order.
APPEND 0 TO lt_order.
APPEND 8 TO lt_order.
APPEND 7 TO lt_order.
APPEND 9 TO lt_order.
APPEND 6 TO lt_order.
APPEND 10 TO lt_order.
APPEND 5 TO lt_order.
APPEND 11 TO lt_order.
APPEND 4 TO lt_order.
APPEND 12 TO lt_order.
APPEND 3 TO lt_order.
APPEND 13 TO lt_order.
APPEND 2 TO lt_order.
APPEND 14 TO lt_order.
APPEND 1 TO lt_order.
APPEND 15 TO lt_order.
lv_nlen = go_stream->take_int( 5 ) + 257.
lv_ndist = go_stream->take_int( 5 ) + 1.
lv_ncode = go_stream->take_int( 4 ) + 4.
DO 19 TIMES.
APPEND 0 TO lt_lengths.
ENDDO.
DO lv_ncode TIMES.
READ TABLE lt_order INDEX sy-index INTO lv_index.
ASSERT sy-subrc = 0.
lv_index = lv_index + 1.
READ TABLE lt_lengths INDEX lv_index ASSIGNING <lv_length>.
ASSERT sy-subrc = 0.
<lv_length> = go_stream->take_int( 3 ).
ENDDO.
CREATE OBJECT go_lencode
EXPORTING
it_lengths = lt_lengths.
CLEAR lt_lengths.
WHILE lines( lt_lengths ) < lv_nlen + lv_ndist.
lv_symbol = decode( go_lencode ).
IF lv_symbol < 16.
APPEND lv_symbol TO lt_lengths.
ELSE.
lv_length = 0.
IF lv_symbol = 16.
READ TABLE lt_lengths INDEX lines( lt_lengths ) INTO lv_length.
ASSERT sy-subrc = 0.
lv_symbol = go_stream->take_int( 2 ) + 3.
ELSEIF lv_symbol = 17.
lv_symbol = go_stream->take_int( 3 ) + 3.
ELSE.
lv_symbol = go_stream->take_int( 7 ) + 11.
ENDIF.
DO lv_symbol TIMES.
APPEND lv_length TO lt_lengths.
ENDDO.
ENDIF.
ENDWHILE.
lt_dists = lt_lengths.
DELETE lt_lengths FROM lv_nlen + 1.
DELETE lt_dists TO lv_nlen.
CREATE OBJECT go_lencode
EXPORTING
it_lengths = lt_lengths.
CREATE OBJECT go_distcode
EXPORTING
it_lengths = lt_dists.
ENDMETHOD.
METHOD fixed.
DATA: lt_lengths TYPE zcl_abapgit_zlib_huffman=>ty_lengths.
DO 144 TIMES.
APPEND 8 TO lt_lengths.
ENDDO.
DO 112 TIMES.
APPEND 9 TO lt_lengths.
ENDDO.
DO 24 TIMES.
APPEND 7 TO lt_lengths.
ENDDO.
DO 8 TIMES.
APPEND 8 TO lt_lengths.
ENDDO.
CREATE OBJECT go_lencode
EXPORTING
it_lengths = lt_lengths.
CLEAR lt_lengths.
DO c_maxdcodes TIMES.
APPEND 5 TO lt_lengths.
ENDDO.
CREATE OBJECT go_distcode
EXPORTING
it_lengths = lt_lengths.
ENDMETHOD.
METHOD map_distance.
CASE iv_code.
WHEN 0.
rv_distance = go_stream->take_int( 0 ) + 1.
WHEN 1.
rv_distance = go_stream->take_int( 0 ) + 2.
WHEN 2.
rv_distance = go_stream->take_int( 0 ) + 3.
WHEN 3.
rv_distance = go_stream->take_int( 0 ) + 4.
WHEN 4.
rv_distance = go_stream->take_int( 1 ) + 5.
WHEN 5.
rv_distance = go_stream->take_int( 1 ) + 7.
WHEN 6.
rv_distance = go_stream->take_int( 2 ) + 9.
WHEN 7.
rv_distance = go_stream->take_int( 2 ) + 13.
WHEN 8.
rv_distance = go_stream->take_int( 3 ) + 17.
WHEN 9.
rv_distance = go_stream->take_int( 3 ) + 25.
WHEN 10.
rv_distance = go_stream->take_int( 4 ) + 33.
WHEN 11.
rv_distance = go_stream->take_int( 4 ) + 49.
WHEN 12.
rv_distance = go_stream->take_int( 5 ) + 65.
WHEN 13.
rv_distance = go_stream->take_int( 5 ) + 97.
WHEN 14.
rv_distance = go_stream->take_int( 6 ) + 129.
WHEN 15.
rv_distance = go_stream->take_int( 6 ) + 193.
WHEN 16.
rv_distance = go_stream->take_int( 7 ) + 257.
WHEN 17.
rv_distance = go_stream->take_int( 7 ) + 385.
WHEN 18.
rv_distance = go_stream->take_int( 8 ) + 513.
WHEN 19.
rv_distance = go_stream->take_int( 8 ) + 769.
WHEN 20.
rv_distance = go_stream->take_int( 9 ) + 1025.
WHEN 21.
rv_distance = go_stream->take_int( 9 ) + 1537.
WHEN 22.
rv_distance = go_stream->take_int( 10 ) + 2049.
WHEN 23.
rv_distance = go_stream->take_int( 10 ) + 3073.
WHEN 24.
rv_distance = go_stream->take_int( 11 ) + 4097.
WHEN 25.
rv_distance = go_stream->take_int( 11 ) + 6145.
WHEN 26.
rv_distance = go_stream->take_int( 12 ) + 8193.
WHEN 27.
rv_distance = go_stream->take_int( 12 ) + 12289.
WHEN 28.
rv_distance = go_stream->take_int( 13 ) + 16385.
WHEN 29.
rv_distance = go_stream->take_int( 13 ) + 24577.
WHEN OTHERS.
ASSERT 1 = 0.
ENDCASE.
ENDMETHOD.
METHOD map_length.
CASE iv_code.
WHEN 257.
rv_length = go_stream->take_int( 0 ) + 3.
WHEN 258.
rv_length = go_stream->take_int( 0 ) + 4.
WHEN 259.
rv_length = go_stream->take_int( 0 ) + 5.
WHEN 260.
rv_length = go_stream->take_int( 0 ) + 6.
WHEN 261.
rv_length = go_stream->take_int( 0 ) + 7.
WHEN 262.
rv_length = go_stream->take_int( 0 ) + 8.
WHEN 263.
rv_length = go_stream->take_int( 0 ) + 9.
WHEN 264.
rv_length = go_stream->take_int( 0 ) + 10.
WHEN 265.
rv_length = go_stream->take_int( 1 ) + 11.
WHEN 266.
rv_length = go_stream->take_int( 1 ) + 13.
WHEN 267.
rv_length = go_stream->take_int( 1 ) + 15.
WHEN 268.
rv_length = go_stream->take_int( 1 ) + 17.
WHEN 269.
rv_length = go_stream->take_int( 2 ) + 19.
WHEN 270.
rv_length = go_stream->take_int( 2 ) + 23.
WHEN 271.
rv_length = go_stream->take_int( 2 ) + 27.
WHEN 272.
rv_length = go_stream->take_int( 2 ) + 31.
WHEN 273.
rv_length = go_stream->take_int( 3 ) + 35.
WHEN 274.
rv_length = go_stream->take_int( 3 ) + 43.
WHEN 275.
rv_length = go_stream->take_int( 3 ) + 51.
WHEN 276.
rv_length = go_stream->take_int( 3 ) + 59.
WHEN 277.
rv_length = go_stream->take_int( 4 ) + 67.
WHEN 278.
rv_length = go_stream->take_int( 4 ) + 83.
WHEN 279.
rv_length = go_stream->take_int( 4 ) + 99.
WHEN 280.
rv_length = go_stream->take_int( 4 ) + 115.
WHEN 281.
rv_length = go_stream->take_int( 5 ) + 131.
WHEN 282.
rv_length = go_stream->take_int( 5 ) + 163.
WHEN 283.
rv_length = go_stream->take_int( 5 ) + 195.
WHEN 284.
rv_length = go_stream->take_int( 5 ) + 227.
WHEN 285.
rv_length = go_stream->take_int( 0 ) + 258.
WHEN OTHERS.
ASSERT 1 = 0.
ENDCASE.
ENDMETHOD.
METHOD not_compressed.
DATA: lv_len TYPE i,
lv_nlen TYPE i ##NEEDED.
DATA lv_bytes TYPE xstring.
* skip any remaining bits in current partially processed byte
go_stream->clear_bits( ).
lv_len = go_stream->take_int( 16 ).
lv_nlen = go_stream->take_int( 16 ).
lv_bytes = go_stream->take_bytes( lv_len ).
CONCATENATE gv_out lv_bytes INTO gv_out IN BYTE MODE.
ENDMETHOD.
METHOD read_pair.
DATA: lv_symbol TYPE i.
rs_pair-length = map_length( iv_length ).
lv_symbol = decode( go_distcode ).
rs_pair-distance = map_distance( lv_symbol ).
ENDMETHOD.
ENDCLASS.
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