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97 lines
2.3 KiB
ABAP
97 lines
2.3 KiB
ABAP
CLASS zcl_abapgit_zlib_huffman DEFINITION
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PUBLIC
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CREATE PUBLIC .
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PUBLIC SECTION.
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TYPES: ty_lengths TYPE STANDARD TABLE OF i WITH DEFAULT KEY.
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CONSTANTS: c_maxbits TYPE i VALUE 15.
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METHODS:
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constructor
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IMPORTING it_lengths TYPE ty_lengths,
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get_count
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IMPORTING iv_index TYPE i
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RETURNING VALUE(rv_value) TYPE i,
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get_symbol
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IMPORTING iv_index TYPE i
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RETURNING VALUE(rv_value) TYPE i.
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PRIVATE SECTION.
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DATA: mt_count TYPE STANDARD TABLE OF i WITH DEFAULT KEY,
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mt_symbol TYPE STANDARD TABLE OF i WITH DEFAULT KEY.
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ENDCLASS.
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CLASS ZCL_ABAPGIT_ZLIB_HUFFMAN IMPLEMENTATION.
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METHOD constructor.
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DATA: lv_index TYPE i,
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lt_offset TYPE TABLE OF i,
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lv_length LIKE LINE OF it_lengths,
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lv_prev TYPE i,
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lv_count LIKE LINE OF mt_count.
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FIELD-SYMBOLS: <lv_offset> LIKE LINE OF lt_offset,
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<lv_symbol> LIKE LINE OF mt_symbol,
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<lv_i> LIKE LINE OF it_lengths.
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DO c_maxbits TIMES.
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APPEND 0 TO mt_count.
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ENDDO.
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LOOP AT it_lengths INTO lv_index.
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IF lv_index = 0.
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CONTINUE.
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ENDIF.
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READ TABLE mt_count INDEX lv_index ASSIGNING <lv_i>.
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ASSERT sy-subrc = 0.
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<lv_i> = <lv_i> + 1.
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ENDLOOP.
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************
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APPEND 0 TO lt_offset.
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DO c_maxbits - 1 TIMES.
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READ TABLE mt_count INDEX sy-index INTO lv_count.
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ASSERT sy-subrc = 0.
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lv_prev = lv_prev + lv_count.
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APPEND lv_prev TO lt_offset.
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ENDDO.
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DO lines( it_lengths ) TIMES.
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APPEND 0 TO mt_symbol.
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ENDDO.
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DO lines( it_lengths ) TIMES.
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lv_index = sy-index.
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READ TABLE it_lengths INDEX lv_index INTO lv_length.
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ASSERT sy-subrc = 0.
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IF lv_length = 0.
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CONTINUE.
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ENDIF.
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READ TABLE lt_offset INDEX lv_length ASSIGNING <lv_offset>.
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ASSERT sy-subrc = 0.
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READ TABLE mt_symbol INDEX <lv_offset> + 1 ASSIGNING <lv_symbol>.
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ASSERT sy-subrc = 0.
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<lv_symbol> = lv_index - 1.
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<lv_offset> = <lv_offset> + 1.
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ENDDO.
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ENDMETHOD.
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METHOD get_count.
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READ TABLE mt_count INDEX iv_index INTO rv_value. "#EC CI_SUBRC
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ENDMETHOD.
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METHOD get_symbol.
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READ TABLE mt_symbol INDEX iv_index INTO rv_value. "#EC CI_SUBRC
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ENDMETHOD.
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ENDCLASS.
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