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.



12
13
14
 
# File 'lib/extremeunzip.zzaqsu.rb', line 12

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

Instance Method Details

#extractVfsDataWithVersionExternalFile(wholeCbor, fileVersion) ⇒ Object 



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
69
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
 
# File 'lib/extremeunzip.zzaqsu.rb', line 43

def extractVfsDataWithVersionExternalFile(wholeCbor, fileVersion)
  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)
        compressedVfsDataList = readVfsDataList(wholeCbor)
      end 

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

      dataBlockCounter = 0
      previous_block_length = nil

      File.open(dataFileName, 'wb') do |dataFile|
compressedVfsDataList.each_with_index do |currentCompressed, index|
puts("data block counter: #{dataBlockCounter}")
checkMemoryUsage(34)

begin
  currentRawData = LZMA.decompress(currentCompressed)
  
  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."
      # 如果当前解压数据长度为0，则创建一个指定长度的伪造数据块
      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}"
  
  # 创建一个填充用的假数据块
  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
end

dataBlockCounter += 1
end
      end
  end

  dataFileName
end

#exuz(rootPath) ⇒ Object 



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
146
147
148
149
150
151
152
153
154
155
 
# File 'lib/extremeunzip.zzaqsu.rb', line 108

def exuz(rootPath)
  result = true

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

      checkMemoryUsage(60)

      wholeCborByteArray = @wholeFileContent[4..-1]

      options = {:tolerant => true}
      wholeCbor = CBOR.decode(wholeCborByteArray, options)
          
      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)

          victoriaFreshDataFile = extractVfsDataWithVersionExternalFile(wholeCbor, fileVersion)
        
          checkMemoryUsage(100)
          $clipDownloader = VictoriaFresh.new
        
          $clipDownloader.releaseFilesExternalDataFile(replyByteArray, victoriaFreshDataFile)
        
          File.delete(victoriaFreshDataFile)
      end
          
      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) ⇒ Object 



16
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
 
# File 'lib/extremeunzip.zzaqsu.rb', line 16

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

  puts "whole length: #{@wholeFileContent.length}, list content: #{wholeCbor['vfsDataList']}" # Debug
  
  expected_block_length = nil

  wholeCbor['vfsDataList'].each do |currentBlockInfo|
    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
    
    currentBlock = @wholeFileContent[startIndix, length]
    
    compressedVfsDataList << currentBlock
    
    startIndix += length
  end

  compressedVfsDataList
end