Class: ExtremeUnZip

Inherits:
Object
  • Object
show all
Defined in:
lib/extremeunzip.zzaqsu.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ExtremeUnZip

Returns a new instance of ExtremeUnZip.



13
14
15
 
# File 'lib/extremeunzip.zzaqsu.rb', line 13

def initialize
  # 移除 StreamDecoder 初始化，改为直接调用 LZMA.decompress
end

Instance Method Details

#extractVfsDataWithVersionExternalFile(wholeCbor, fileVersion, currentBlockFile) ⇒ Object 



70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
 
# File 'lib/extremeunzip.zzaqsu.rb', line 70

def extractVfsDataWithVersionExternalFile(wholeCbor, fileVersion, currentBlockFile)
  dataFileName = 'victoriafreshdata.w'
  expected_block_length = nil

  if (fileVersion == 14)
      compressedVfsData = wholeCbor['vfsData']
      victoriaFreshData = LZMA.decompress(compressedVfsData)


      File.open(dataFileName, 'wb') do |dataFile|
          dataFile.syswrite(victoriaFreshData)
          puts "After writing initial block, raw data file size: #{File.size(dataFileName)}"
      end
  elsif (fileVersion >= 30)
      compressedVfsDataList = wholeCbor['vfsDataList']
      
      if (fileVersion >= 251)
        # Returns list of temp file paths
        compressedVfsDataList = readVfsDataList(wholeCbor, currentBlockFile)
      end 

      puts("data block amount: #{compressedVfsDataList.length}")

      dataBlockCounter = 0
      previous_block_length = nil

      File.open(dataFileName, 'wb') do |dataFile|
        begin
          # Process one block at a time
          compressedVfsDataList.each_with_index do |temp_path, index|
            puts("data block counter: #{dataBlockCounter}")
            checkMemoryUsage(30)

            currentRawData = nil

            begin
              File.open(temp_path, 'rb') do |f|
                compressedData = f.read
                currentRawData = LZMA.decompress(compressedData)
              end

              if previous_block_length.nil?
                previous_block_length = currentRawData.length
                expected_block_length ||= previous_block_length
              elsif currentRawData.length != previous_block_length || currentRawData.length == 0
                if currentRawData.length == 0
                  puts "Warning: decompressed block length is zero at block #{index}. Generating fake data of expected length."
                  currentRawData = "\x00" * expected_block_length
                else
                  puts "Warning: unexpected decompressed block length detected at block #{index}. Previous length: #{previous_block_length}, current length: #{currentRawData.length}"
                end
              end
              
              dataFile.syswrite(currentRawData)
              puts "After writing block #{index}, raw data file size: #{File.size(dataFileName)}"
            rescue RuntimeError => e
              puts "Warning: the exz file may be incomplete at block #{index}. Error: #{e.message}"
              
              fake_data_block = "\x00" * expected_block_length
              dataFile.syswrite(fake_data_block)
              puts "After writing fake block #{index}, raw data file size: #{File.size(dataFileName)}"
              next
            ensure
              # ✅ Delete after use
              File.unlink(temp_path) rescue nil
            end

            dataBlockCounter += 1
            checkMemoryUsage(70)
          end
        end
      end
  end

  dataFileName
end

#exuz(rootPath) ⇒ Object 



147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
 
# File 'lib/extremeunzip.zzaqsu.rb', line 147

def exuz(rootPath)
  result = true

  begin
      currentBlockFile = File.new(rootPath, 'rb')
      @wholeFileContent = currentBlockFile.read

      checkMemoryUsage(60)

      wholeCborByteArray = @wholeFileContent[4..-1]

      options = {:tolerant => true}
      wholeCbor = CBOR.decode(wholeCborByteArray, options)
          
      # ✅ Release wholeCborByteArray immediately after use
      wholeCborByteArray = nil
      GC.start

      fileVersion = wholeCbor['version']
          
      if (fileVersion < 14)
          checkMemoryUsage(85)
          puts 'file version too old'
      else
          compressedVfsMenu = wholeCbor['vfsMenu']
          puts "compressed vfs menu size: #{compressedVfsMenu.size}"

          checkMemoryUsage(90)
          replyByteArray = LZMA.decompress(compressedVfsMenu)
        
          checkMemoryUsage(95)

          # ✅ Pass currentBlockFile all the way down
          victoriaFreshDataFile = extractVfsDataWithVersionExternalFile(wholeCbor, fileVersion, currentBlockFile)
        
          checkMemoryUsage(100)
          $clipDownloader = VictoriaFresh.new
        
          $clipDownloader.releaseFilesExternalDataFile(replyByteArray, victoriaFreshDataFile)
        
          File.delete(victoriaFreshDataFile)
      end

      # ✅ Close file only after ALL operations
      currentBlockFile.close
      @wholeFileContent = nil

      result = true
  rescue EOFError => e
      puts "Error: the exz file may be incomplete. Error: #{e.message}"
      result = false
  rescue => e
      puts "Unexpected error: #{e.message}"
      result = false
  end
end

#readVfsDataList(wholeCbor, currentBlockFile) ⇒ Object 



17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
 
# File 'lib/extremeunzip.zzaqsu.rb', line 17

def readVfsDataList(wholeCbor, currentBlockFile) 
  compressedVfsDataList = []
  startIndix = wholeCbor['vfsDataListStart']

  puts "list content: #{wholeCbor['vfsDataList']}" # Debug
  
  expected_block_length = nil

  # ✅ Release @wholeFileContent BEFORE the loop
  @wholeFileContent = nil
  GC.start

  # Ensure temp dir exists
  Dir.mkdir('/tmp/exz_blocks') rescue Errno::EEXIST

  wholeCbor['vfsDataList'].each_with_index do |currentBlockInfo, index|
    length = currentBlockInfo['length']
    
    if expected_block_length.nil?
      expected_block_length = length
    elsif length != expected_block_length
      puts "Warning: unexpected block length detected. Expected: #{expected_block_length}, got: #{length}"
    end
    
    # ✅ Read directly from file on disk
    currentBlockFile.seek(startIndix)
    currentBlock = currentBlockFile.read(length)
    
    # ✅ Write to persistent temp file (not Tempfile)
    path = "/tmp/exz_blocks/block_#{Time.now.to_i}_#{rand(1000..9999)}.dat"
    File.open(path, 'wb') do |f|
      f.binmode
      f.write(currentBlock)
    end
    
    # Store path only
    compressedVfsDataList << path
    
    # ✅ Immediately release currentBlock
    currentBlock = nil
    
    # Optional: trigger GC periodically
    GC.start if index % 5 == 0

    startIndix += length

    # ✅ Monitor memory after each block
    checkMemoryUsage(200)
  end

  compressedVfsDataList
end