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Cleanups.
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@ -183,6 +183,7 @@ func decompress_lzw(code_stream_data: PoolByteArray, min_code_size: int, colors:
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prevcode = code
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elif code == clear_code_index + 1: # Stop when detected EOI Code.
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break
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# is CODE in the code table?
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var code_entry: CodeEntry = code_table.get(code)
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if code_entry != null: # if YES
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@ -193,35 +194,20 @@ func decompress_lzw(code_stream_data: PoolByteArray, min_code_size: int, colors:
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# warning-ignore:return_value_discarded
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# add {PREVCODE} + k to the code table
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var prev_code_entry: CodeEntry = code_table.get(prevcode)
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if prev_code_entry:
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code_table.add(prev_code_entry.add(k))
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else:
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code_table.add(k)
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# set PREVCODE = CODE
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prevcode = code
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else: # if NO
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# let k be the first index of {PREVCODE}
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var prevcode_entry: CodeEntry = code_table.get(prevcode)
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var k: CodeEntry
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if prevcode_entry:
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k = CodeEntry.new([prevcode_entry.sequence[0]])
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else:
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k = CodeEntry.new([ code ])
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var k: CodeEntry = CodeEntry.new([prevcode_entry.sequence[0]])
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# output {PREVCODE} + k to index stream
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index_stream.append_array(prevcode_entry.add(k).sequence)
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# output {PREVCODE} + k to index stream
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if prevcode_entry:
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index_stream.append_array(prevcode_entry.add(k).sequence)
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else:
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index_stream.append_array(k.sequence)
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# add {PREVCODE} + k to code table
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# warning-ignore:return_value_discarded
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if prevcode_entry:
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code_table.add(prevcode_entry.add(k))
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else:
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code_table.add(k)
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# set PREVCODE = CODE
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prevcode = code
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